A device for rapid replacement of film and positioning of radioactive source in pipeline weld radiographic testing of nuclear power plant

Abstract

The present application belongs to the technical field of nondestructive testing, and particularly relates to a nuclear power plant pipeline weld radiographic testing rapid film replacement and radioactive source linkage positioning device. The device comprises a slide rail, a film fixing device, a radioactive source linkage device and a slide rail locking device. The two ends of the slide rail are respectively connected with the slide rail locking device, the slide rail is connected with the film fixing device, and the film fixing device is connected with the radioactive source linkage device. The V-shaped clamping groove of the slide rail is made of resin material, can be close to the pipe wall, and the pulley is not easy to shake in the V-shaped slide. The lead character clamping groove reserved at the lower part of the slide rail can realize direct installation and positioning of the positioning mark. The slide rail locking mechanism can realize rapid locking and fine adjustment of the slide rail, adapt to the site conditions, and the design of the buckle facilitates installation and disassembly. The film positioning device adopts a track sliding mode, the sliding module is quickly moved to the inspection position, the clamping pin is inserted into the reserved clamping groove to complete the fixation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of nondestructive testing, and particularly relates to a device for rapid replacement of films and linkage positioning of radioactive sources for radiographic testing of pipeline welds in nuclear power plants. BACKGROUND

[0002] In nuclear power plants, a considerable number of pipeline welds are in a high-temperature and high-pressure state for a long time, and high-radioactive medium flows through them, which may cause cracks, brittle fracture and other unfavorable factors. According to the in-service inspection specifications for nuclear power operation, the area must be periodically inspected, and the pipeline welds are inspected by two volumetric methods, namely ultrasonic testing and radiographic testing.

[0003] When the pipeline welds are radiographically tested, according to the standard requirements, the butt welds of pipelines with a diameter greater than 89 mm are generally tested by the double-wall single-image transmission method, and the double-wall transmission method is performed multiple times according to the diameter of the pipeline to be tested. The butt welds of the primary circuit are corroded by high-radioactive medium for a long time, and the radiation dose is high during the low-low water level period. The existing method is that the inspector manually arranges the film, fixes the film with a loose rope, and then sticks and fixes the radioactive source with adhesive tape, which is low in efficiency and accuracy. The film quality often deviates from the program requirements, and the radiographic testing needs to be re-implemented. This affects the low-low water level time of the nuclear power plant, increases the radiation dose of the personnel, and does not comply with the ALARA principle of radiation protection. Therefore, it is necessary to design a device suitable for different pipe diameters, which can quickly complete the positioning and marking of double-wall single-image, the replacement and fixation of films, and the linkage positioning and fixation of radioactive sources, to improve the work efficiency and reduce the radiation time of personnel. SUMMARY

[0004] The purpose of the present application is to provide a device for rapid replacement of films and linkage positioning of radioactive sources for radiographic testing of pipeline welds in nuclear power plants, which can achieve rapid replacement of films and linkage positioning of radioactive sources. The device can achieve rapid replacement and fixation of films and linkage positioning of radioactive sources.

[0005] The technical solution of the present application is as follows: a device for rapid replacement of films and linkage positioning of radioactive sources for radiographic testing of pipeline welds in nuclear power plants, comprising a sliding rail, a film fixing device, a radioactive source linkage device and a sliding rail locking device, wherein the two ends of the sliding rail are connected to the sliding rail locking devices, the sliding rail is connected to the film fixing device, and the film fixing device is connected to the radioactive source linkage device.

[0006] The film fixing device comprises a first pressing rod locking screw, a first sliding block, a first pressing rod support, a first pressing rod rotary joint limiting block, a second pressing rod rotary joint limiting block, a first film fixing hook, a second film fixing hook, a first pulley and a film pressing rod.

[0007] The two pressing rods and the plate connecting the radioactive source linkage device are of an integrated structure, and the first sliding block and the second sliding block are of the same structure.

[0008] The radioactive source linkage device comprises a radioactive source linkage bent pipe, a source head fixing clamp and a source head fixing screw, one end of the radioactive source linkage bent pipe is connected with a semicircular source head fixing clamp, the source head fixing clamp is provided with the source head fixing screw, and the source head fixing screw can be screwed into the source head fixing clamp.

[0009] The radioactive source linkage bent pipe is connected with the film fixing device through a radioactive source linkage bent pipe bolt, and the other end source head fixing clamp is a radioactive source placing position.

[0010] The sliding rail is made of a V-shaped clamping groove of a resin material, the lower part of the sliding rail is provided with a positioning lead character clamping groove, and the upper part of the sliding rail is further provided with a sliding block fixing hole.

[0011] The positioning lead character clamping groove has a width of 5 mm and is located at the bottom of the sliding rail.

[0012] The sliding rail locking device comprises a rotating handle, a buckle, a first fixed nut, a fine adjustment locking nut, a second fixed nut, a buckle fixing block, a third fixed nut, a clamping groove fixing block and a fourth fixed nut, the buckle is of a plate structure and has a through groove at one end, the fine adjustment locking nut passes through the through groove and is connected with the buckle fixing block, the two ends of the buckle fixing block are respectively fixed with the first fixed nut and the second fixed nut, the buckle is further connected with the clamping groove fixing block, the two ends of the clamping groove fixing block are respectively fixed with the third fixed nut and the fourth fixed nut, and the end of the buckle is connected with the rotating handle.

[0013] The other end of the sliding rail is connected with the clamping groove fixing block, the first pulley and the second pulley are placed on the sliding rail, the third pulley, the fourth pulley and the second sliding block are placed on the sliding rail.

[0014] One end of the slide rail is fixed with a buckle by a fine-tuning locking nut.

[0015] The beneficial effects of the present invention are as follows: the slide rail of the present invention is made of a V-shaped groove made of resin material, which can be tightly attached to the pipe wall, and the pulley is not easy to shake in the V-shaped slide rail. The lead-type groove reserved at the bottom of the slide rail can realize the direct installation and positioning of the positioning mark; the slide rail locking mechanism of the present invention can realize the rapid locking and fine-tuning of the slide rail to adapt to the site conditions, and the buckle design is convenient for installation and disassembly; the film positioning device of the present invention adopts a track sliding method, and the sliding module is quickly moved to the inspection position, and the bayonet is inserted into the reserved slot to complete the fixation. The film clamping rod can be rotated to the vertical pipe surface, which is convenient for operators to replace the film. The clamping mechanism is designed at both ends of the film and can flexibly clamp the two ends of the film according to the site conditions; the radiation source linkage device of the present invention adopts a curved pipe with the same curvature as the pipeline to be inspected, with a length of half the circumference of the pipeline. The top is equipped with a source locking function, which can be linked to the radiography position as the sliding module rotates. The device for rapid film replacement and radioactive source positioning for pipeline weld radiographic inspection, described in this invention, features a simple structure, easy operation, and strong adaptability. Positioning marks can be pre-calculated and installed, enabling coordinated radioactive source and film placement. This improves the efficiency of on-site workers, increases success rates, reduces radiation dose, and significantly saves time for radiographic inspections in nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A top view of a device for quickly replacing negative films and linking radioactive source positioning for radiographic inspection of nuclear power plant pipeline welds provided by the present invention;

[0017] Figure 2 This is a schematic diagram of the overall structure of a device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds provided by the present invention;

[0018] Figure 3 Schematic diagram of the structure of the negative film fixing device;

[0019] Figure 4 This is a schematic diagram of the radioactive source linkage device;

[0020] Figure 5 Schematic diagram of the slide rail structure;

[0021] Figure 6 for Figure 5 A side view schematic diagram of;

[0022] Figure 7 Schematic diagram of the slide rail locking device;

[0023] Figure 8 This is a schematic diagram of the card slot fixing block;

[0024] Figure 9 This is a schematic diagram of a device for quickly replacing negative films and linking radioactive source positioning for radiographic inspection of nuclear power plant pipeline welds provided by the present invention;

[0025] Figure 10 It is a top view schematic diagram of the film fixing device;

[0026] Figure 11 It is a front view schematic diagram of the film fixing device.

[0027] In the figure: 101 film fixing device, 102 radiation source linkage device, 104 slide rail locking device, 1 rotary handle, 2 buckle, 3 first fixing nut, 4 fine adjustment locking nut, 5 second fixing nut, 6 buckle fixing block, 7 slide rail, 8 third fixing nut, 9 slot fixing block, 10 fourth fixing nut, 11 first pressure rod locking screw, 12 second pressure rod locking screw, 13 first slide block, 14 second slide block, 15 first pressure rod bracket, 16 second pressure rod bracket, 17 Slider positioning pin, 18 first clamping rod rotation joint limit block, 19 second clamping rod rotation joint limit block, 20 first negative film fixing hook, 22 second negative film fixing hook, 24 radioactive source linkage elbow, 25 source fixing clamp, 26 source fixing screw, 27 first pulley, 28 second pulley, 29 third pulley, 30 fourth pulley, 31 slider fixing hole, 32 positioning lead type slot, 33 clamping rod rotation joint connecting bolt, 34 negative film pressure rod, 35 radioactive source linkage elbow bolt. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 As shown, a device for quickly replacing negative film and linking a radioactive source to position the radiographic inspection film of a nuclear power plant pipeline weld includes a slide rail 7, a negative film fixing device 101, a radioactive source linking device 102, and a slide rail locking device 104. The two ends of the slide rail 7 are respectively connected to the slide rail locking device 104, the slide rail 7 is connected to the negative film fixing device 101, and the negative film fixing device 101 is connected to the radioactive source linking device 102.

[0030] like Figure 2 As shown, the fine-tuning locking nut 4 fixes the buckle 2 to one end of the slide rail 7, and the other end of the slide rail 7 is connected to the slot fixing block 9, the first pulley 27 and the second pulley 28 are placed on the slide rail 7, and the third pulley 29, the fourth pulley 30 and the second slider 14 are placed on the slide rail 7.

[0031] like Figure 3As shown, the film fixing device 101 includes a first pressing rod locking screw 11, a first sliding block 13, a first pressing rod support 15, a first pressing rod rotary joint limiting block 18, a second pressing rod rotary joint limiting block 19, a first film fixing hook 20, a second film fixing hook 22, a first pulley 27 and a film pressing rod 34. The film pressing rod 34 has one end connected to the second film fixing hook 22 and the first film fixing hook 20, and the second film fixing hook 22 and the first film fixing hook 20 are spaced apart on the film pressing rod 34. The middle position of the film pressing rod 34 is connected with the second pressing rod rotary joint limiting block 19. The film pressing rod 34 on the side of the second pressing rod rotary joint limiting block 19 is connected with the first pressing rod rotary joint limiting block 18. The film pressing rod 34 on the side of the first pressing rod rotary joint limiting block 18 is provided with a pressing rod rotary joint connecting bolt 33. The film pressing rod 34 outside the pressing rod rotary joint connecting bolt 33 is connected with the first pressing rod support 15. The first pressing rod support 15 is installed with the first sliding block 13. The first sliding block 13 is installed with the first pulley 27. The first pressing rod locking screw 11 penetrates the end of the film pressing rod 34.

[0032] The two pressing rods of the film fixing device 101 and the plate connected with the radioactive source linkage device 102 are of an integrated structure. The first sliding block 13 and the second sliding block 14 are of the same structure.

[0033] As shown in the figure, Figure 4 The radioactive source linkage device 102 includes a radioactive source linkage elbow 24, a source head fixing clamp 25 and a source head fixing screw 26. The radioactive source linkage elbow 24 has one end connected with the semicircular source head fixing clamp 25. The source head fixing clamp 25 is installed with the source head fixing screw 26 which can be screwed into the source head fixing clamp 25. The radioactive source linkage elbow 24 is connected with the film fixing device 101 through a radioactive source linkage elbow bolt 35. The other end of the source head fixing clamp 25 is the place for placing the radioactive source.

[0034] As shown in the figure, Figure 5 The slide rail 7 is a V-shaped clamping groove made of resin material. The resin material can ensure the strength while realizing that the slide rail 7 is close to the pipe wall. The V-shaped clamping groove structure makes the pulley not easy to shake after the track is bent. The slide rail 7 has a positioning lead character clamping groove 32 at the lower part. The lead character interval required for the radiation detection can be calculated in advance and inserted into the clamping groove, so as to realize the rapid positioning of the lead character marking. The slide rail 7 is also provided with a sliding block fixing hole 31. The sliding block fixing hole 31 is at the six equal division points of the slide rail. The positioning lead character clamping groove 32 has a width of 5 mm and is located at the bottom of the slide rail 7. One is set every 30 mm.

[0035] As shown in the figure, Figure 7As shown, the slide rail locking device 104 includes a rotating handle 1, a buckle 2, a first fixed nut 3, a fine adjustment locking nut 4, a second fixed nut 5, a buckle fixing block 6, a third fixed nut 8, a card slot fixing block 9 and a fourth fixed nut 10, wherein the buckle 2 is of a plate structure with a through slot at one end, the fine adjustment locking nut 4 passes through the through slot to connect the buckle fixing block 6, the two ends of the buckle fixing block 6 are respectively fixed with the first fixed nut 3 and the second fixed nut 5, the buckle 2 is further connected with the card slot fixing block 9, the two ends of the card slot fixing block 9 are respectively fixed with the third fixed nut 8 and the fourth fixed nut 10, and the end of the buckle 2 is connected with the rotating handle 1.

[0036] Considering some deviations of the field pipeline during installation, the slide rail locking mechanism reserves an adjustment amount of 10mm during design, which can be adjusted through the fine adjustment locking nut. The rotating buckle mode can realize quick installation and disassembly of the rail.

[0037] The double-wall single shadow transillumination mode generally performs multiple transillumination according to the diameter of the detected pipeline, and the radioactive source and the film are respectively arranged at two ends of the pipeline diameter. The existing mode is to manually arrange the film, fix the film with a loose belt, place the radioactive source at the transillumination position, and paste with adhesive tape. The above steps are a one-time radiation film arrangement operation. There are problems such as not firm, not easy to adjust, and each time the film is arranged, the transillumination position of the radioactive source needs to be determined again. The quick film replacement and radioactive source linkage positioning device adopts a rail sliding mode, the sliding module can quickly move to the corresponding positioning card slot, and is provided with a cotter for quickly fixing the position. The film pressing rod can be rotated to be perpendicular to the pipeline wall, facilitating quick film replacement. The film pressing rod is provided with a radioactive source fixing tube with a fixed length and curvature at the center, which can be linked to the transillumination position with the movement of the sliding module. Through the design of film replacement and radioactive source linkage, the field work efficiency and success rate are improved.

[0038] The installation and use process of the present application is as follows:

[0039] 1) The first fixed nut 3 and the second fixed nut 5 fix the buckle fixing block 6 on the slide rail 7.

[0040] 2) The third fixed nut 8 fixes the card slot fixing block 9 on the slide rail 7.

[0041] 3) The rotating handle 1 puts the buckle 2 into the card slot fixing block 9.

[0042] 4) Loosen the fine adjustment locking nut 4, and tighten the fine adjustment locking nut 4 after the slide rail 7 is tightly attached to the pipeline wall without displacement, to complete the installation of the slide rail 7.

[0043] 5) The first sliding block 13 and the second sliding block 14 connect the film fixing device 1 to the V-shaped slide rail 7 through pulleys (first pulley 27, second pulley 28, third pulley 29 and fourth pulley 30).

[0044] 6) The slider positioning pin 17 is inserted into the track surface slider positioning hole 31, realizing the quick movement fixation of the sliding mechanism.

[0045] 7) The rotating pressure rod rotating joint connecting bolt 33 is turned, so that the whole bottom sheet fixing device 101 is perpendicular to the pipe surface, and the bottom sheet is fixed on the bottom sheet fixing device 101 through the bottom sheet fixing hook.

[0046] 8) The rotating pressure rod rotating joint is turned, the first pressure rod rotating joint limiting block 18 and the second pressure rod rotating joint limiting block 19 are moved, the first pressure rod locking screw 11 and the second pressure rod locking screw 12 are rotated, the bottom sheet pressure rod 34 is driven to rotate, and the bottom sheet is fixed on the pipe wall.

[0047] 9) The radiation source linkage device 102 calculates the length and the bending radius in advance according to the pipe diameter, and manufactures the radiation source linkage bending pipe 24.

[0048] 10) After the first slider 13 is fixed in position, the source fixing clamp 25 reaches the radiographic position, the radiation source is placed in the source fixing clamp 25, and the source fixing screw 26 is rotated to complete the fixation of the radiation source.

Claims

1. A device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds, characterized by: It includes a slide rail, a film fixing device, a radioactive source linkage device and a slide rail locking device, wherein the two ends of the slide rail are respectively connected to the slide rail locking device, the slide rail is connected to the film fixing device, and the film fixing device is connected to the radioactive source linkage device. The radioactive source linkage device includes a radioactive source linkage elbow, a source fixing clamp and a source fixing screw. One end of the radioactive source linkage elbow is connected to a semicircular source fixing clamp, and the source fixing screw is installed on the source fixing clamp, and the source fixing screw can be screwed into the source fixing clamp.

2. The device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds according to claim 1, characterized in that: The first pulley and the second pulley are installed on the first slide block, and the first pulley and the second pulley are installed on the first slide block.

3. The device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds according to claim 2, characterized in that: The film fixing device also includes a second slider. The first slider and the second slider have the same structure. Another film pressure rod is connected to the second slider. The left and right film pressure rods of the film fixing device and the plate connected to the radiation source linkage device are an integrated structure.

4. The device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds according to claim 1, characterized in that: The radioactive source linkage elbow is connected to the film fixing device through a radioactive source linkage elbow bolt, and the source fixing clamp at the other end is where the radioactive source is placed.

5. The device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds according to claim 1, characterized in that: The slide rail is made of a V-shaped groove made of resin material. The lower part of the slide rail is provided with a lead-type positioning groove, and a slider fixing hole is also provided on the slide rail.

6. The device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds according to claim 5, characterized in that: The width of the positioning lead type slot is 5mm, and it is located at the bottom of the slide rail, with one slot set every 30mm.

7. The device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds according to claim 1, characterized in that: The slide rail locking device includes a handle, a buckle, a first fixing nut, a fine-tuning locking nut, a second fixing nut, a buckle fixing block, a third fixing nut, a slot fixing block and a fourth fixing nut, wherein the buckle is a plate-like structure with a through slot at one end, the fine-tuning locking nut passes through the through slot and is connected to the buckle fixing block, the first and second fixing nuts are respectively fixed at both ends of the buckle fixing block, the slot fixing block is also connected to the buckle, the third and fourth fixing nuts are respectively fixed at both ends of the slot fixing block, and the end of the buckle is connected to the handle.

8. The device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds according to claim 7, characterized in that: The other end of the slide rail is connected with a card slot fixing block, the first pulley and the second pulley are placed on the slide rail, the second slider passes through the third pulley, and the fourth pulley is placed on the slide rail.

9. A device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds as claimed in claim 8, characterized in that: One end of the slide rail is fixed with a buckle by a fine-tuning locking nut.

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