Linkage positioning device for quickly replacing negative film and radioactive source in radiographic inspection of nuclear power station pipeline welding seam

Abstract

The invention belongs to the technical field of nondestructive testing, and particularly relates to a linkage positioning device for quickly replacing a negative film and a radioactive source in radiographic inspection of a nuclear power station pipeline welding seam. Comprising a sliding rail, a negative film fixing device, a radioactive source linkage device and sliding rail locking devices, the two ends of the sliding rail are connected with the sliding rail locking devices respectively, the sliding rail is connected with the negative film fixing device, and the negative film fixing device is connected with the radioactive source linkage device. The sliding rail has the beneficial effects that the sliding rail is a V-shaped clamping groove made of a resin material, the sliding rail can be tightly attached to the pipe wall, and the pulley is not prone to shaking in the V-shaped sliding rail. A lead character clamping groove reserved in the lower portion of the sliding rail can achieve direct installation and positioning of a positioning mark; according to the sliding rail locking mechanism, rapid locking and fine adjustment of the sliding rail can be achieved, the sliding rail locking mechanism adapts to field conditions, and mounting and dismounting are convenient due to the design of the buckles; according to the negative film positioning device, a rail sliding mode is adopted, the sliding module rapidly moves to an inspection position, and the bayonet lock is inserted into the reserved clamping groove to complete fixation.

Description

Technical Field

[0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a device for quickly replacing negative films and linking a radioactive source to position radiographically detected nuclear power plant pipeline welds. Background Art

[0002] A considerable number of pipeline welds in nuclear power plants are under high temperature and high pressure for a long time, and highly radioactive media flow through them, which may cause cracks, brittle fractures and other adverse factors. According to the in-service inspection specifications for nuclear power operation, this area must be inspected regularly, and pipeline welds are mostly inspected by two volumetric methods: ultrasonic inspection and radiographic inspection.

[0003] When the pipeline welds are inspected by radiography, according to the standard requirements, the butt welds of pipes with a diameter greater than 89 mm generally adopt the double-wall single-shadow radiography method. The double-wall radiography method performs multiple radiography according to the diameter of the inspected pipe. The butt welds of the primary circuit are corroded by highly radioactive media for a long time, and the radiation dose is high during the low water level. The existing method is that the inspectors manually lay out the film, fix the film with elastic ropes, and then stick the radioactive source with tape to fix it, which is inefficient and not very accurate. The quality of the film often does not meet the program requirements due to the deviation of the film arrangement, and the radiographic inspection needs to be re-implemented. It affects the time of the low water level of the nuclear power plant, increases the radiation dose of personnel, and does not meet the ALARA principle of radiation protection. Based on this, it is necessary to design a device suitable for different pipe diameters that can quickly complete double-wall single-shadow positioning marking, film replacement and fixation, and radioactive source linkage positioning and fixation to improve work efficiency and reduce the time personnel are exposed to radiation. Summary of the invention

[0004] The purpose of the present invention is to provide a device for quickly replacing negative film and linking positioning of radiation sources for radiographic detection of nuclear power plant pipeline welds, which can realize quick replacement of negative film and linking positioning of radiation sources. The device can realize quick replacement and fixation of negative film and linking positioning of radiation sources.

[0005] The technical solution of the present invention is as follows: a device for quickly replacing negative film and linking a radioactive source for radiographic inspection of nuclear power plant pipeline welds, comprising a slide rail, a negative film fixing device, a radioactive source linking 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 negative film fixing device, and the radioactive source linking device is connected to the negative film fixing device.

[0006] The film fixing device comprises a first pressure rod locking screw, a first sliding block, a first pressure rod bracket, a first pressure rod rotation joint limit block, a second pressure rod rotation joint limit block, a first film fixing hook, a second film fixing hook, a first pulley and a film pressure rod, wherein one end of the film pressure rod is connected to the second film fixing hook and the first film fixing hook, and the second film fixing hook and the first film fixing hook are spaced a certain distance apart on the film pressure rod, the middle position of the film pressure rod is connected to the second pressure rod rotation joint limit block, the film pressure rod located on one side of the second pressure rod rotation joint limit block is connected to the first pressure rod rotation joint limit block, the film pressure rod located on one side of the first pressure rod rotation joint limit block is provided with a pressure rod rotation joint connecting bolt, the film pressure rod outside the pressure rod rotation joint connecting bolt is connected to the first pressure rod bracket, the first pressure rod bracket is installed with a first slider, the first slider is installed with a first pulley, and the first pressure rod locking screw passes through the end of the film pressure rod.

[0007] The left and right pressing rods of the film fixing device and the plate connected with the radiation source linkage device are an integrated structure, and the first sliding block and the second sliding block are of the same structure.

[0008] The radiation source linkage device comprises a radiation source linkage elbow, a source fixing clamp and a source fixing screw. One end of the radiation source linkage elbow is connected with a semicircular source fixing clamp, and a source fixing screw is installed on the source fixing clamp. The source fixing screw can be screwed into the source fixing clamp.

[0009] The radioactive source linkage elbow is connected to the film fixing device through the radioactive source linkage elbow bolt, and the source fixing clamp at the other end is the radioactive source placement location.

[0010] The slide rail is made of a V-shaped groove made of resin material, a lead-type groove is provided at the lower part of the slide rail for positioning, and a slide block fixing hole is also arranged on the slide rail.

[0011] 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.

[0012] 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 to connect to the buckle fixing block, the first fixing nut and the second fixing nut are respectively fixed at both ends of the buckle fixing block, the buckle is also connected to the slot fixing block, the third fixing nut and the fourth fixing nut are respectively fixed at both ends of the slot fixing block, and the end of the buckle is connected to the handle.

[0013] The other end of the slide rail is connected with a slot fixing block, the first pulley and the second pulley are placed on the slide rail, and the third pulley, the fourth pulley and the second sliding block are placed on the slide 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 close to the pipe wall, and the pulley is not easy to shake in the V-shaped slide. 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, adapt to the on-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, the sliding module quickly moves to the inspection position, and the bayonet is inserted into the reserved groove to complete the fixation. The film clamping rod can be rotated to the vertical pipeline 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 on-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, and the length is half of the circumference of the pipeline. The top is equipped with a source locking function, which can be linked to the transillumination position with the rotation of the sliding module. The pipeline weld radiographic inspection rapid replacement film and radioactive source linkage positioning device of the present invention has a simple structure, convenient operation, strong adaptability, and can calculate and install positioning marks in advance to realize the linkage between the radioactive source and the film arrangement. It can improve the work efficiency of on-site staff, increase the success rate, reduce the radiation dose of personnel, and save a lot of time for nuclear power plant radiographic inspection. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 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 It is a schematic diagram of the structure of the 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 It is a schematic diagram of the slide rail locking device;

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

[0024] Fig. 9 A schematic diagram of a device for quickly replacing negative film and linking positioning of a radiographic inspection source for nuclear power plant pipeline welds provided by the present invention;

[0025] Fig.10 is a top view schematic diagram of a film fixing device;

[0026] Fig.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 turn handle, 2 buckle, 3 first fixing nut, 4 fine-adjusting 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 clamping rod locking screw, 12 second clamping rod locking screw, 13 first slide block, 14 second slide block, 15 first clamping rod bracket, 16 second clamping rod bracket, 17 Slider locating pin, 18 first clamping rod rotating joint limit block, 19 second clamping rod rotating joint limit block, 20 first film fixing hook, 22 second film fixing hook, 24 radiation source linkage bent pipe, 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 rotating joint connecting bolt, 34 film pressure rod, 35 radiation source linkage bent pipe bolt. DETAILED DESCRIPTION

[0028] The present invention is 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 positioning of a radiographic inspection of pipeline welds in a nuclear power plant comprises a slide rail 7, a negative film fixing device 101, a radioactive source linking device 102 and a slide rail locking device 104, wherein both 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 radioactive source linking device 102 is connected to the negative film fixing device 101.

[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 clamping rod locking screw 11, a first slider 13, a first clamping rod bracket 15, a first clamping rod rotation joint limit block 18, a second clamping rod rotation joint limit block 19, a first film fixing hook 20, a second film fixing hook 22, a first pulley 27 and a film pressing rod 34, wherein one end of the film pressing rod 34 is connected to the second film fixing hook 22 and the first film fixing hook 20, the second film fixing hook 22 and the first film fixing hook 20 are spaced a certain distance apart on the film pressing rod 34, and the middle position of the film pressing rod 34 is connected to the second clamping rod The rotating joint limit block 19, the first clamping rod rotating joint limit block 18 is connected to the negative film pressure rod 34 located on one side of the second clamping rod rotating joint limit block 19, a clamping rod rotating joint connecting bolt 33 is provided on the negative film pressure rod 34 located on one side of the first clamping rod rotating joint limit block 18, the first clamping rod bracket 15 is connected to the negative film pressure rod 34 outside the clamping rod rotating joint connecting bolt 33, the first clamping rod bracket 15 is installed with the first slider 13, the first slider 13 is installed with the first pulley 27, and the first clamping rod locking screw 11 passes through the end of the negative film pressure rod 34.

[0032] The left and right pressing rods of the film fixing device 101 and the plate connected to the radiation source linkage device 102 are an integrated structure, and the first sliding block 13 and the second sliding block 14 are of the same structure.

[0033] like Figure 4 As shown, the radiation source linkage device 102 includes a radiation source linkage elbow 24, a source fixing clamp 25 and a source fixing screw 26. One end of the radiation source linkage elbow 24 is connected to a semicircular source fixing clamp 25, and the source fixing screw 26 is installed on the source fixing clamp 25. The source fixing screw 26 can be screwed into the source fixing clamp 25. The radiation source linkage elbow 24 is connected to the film fixing device 101 through the radiation source linkage elbow bolt 35. The other end of the source fixing clamp 25 is where the radiation source is placed.

[0034] like Figure 5 As shown, the slide rail 7 is a V-shaped groove made of resin material. The resin material can ensure the strength while making the slide rail 7 close to the pipe wall. The V-shaped groove structure makes it difficult for the pulley to shake after the track is bent. There is a positioning lead type slot 32 at the bottom of the slide rail 7. The lead type spacing required for radiographic detection can be calculated in advance and inserted into the slot, thereby realizing the rapid positioning of the lead type mark. The slide rail 7 is also provided with a slider fixing hole 31. The slider fixing hole 31 is located at the sixth equal point of the slide rail. The positioning lead type slot 32 has a width of 5mm and is located at the bottom of the slide rail 7, with one provided every 30mm.

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

[0036] Taking into account some deviations of on-site pipelines during installation, the slide rail locking mechanism is designed with a 10mm adjustment range, which can be adjusted by fine-tuning the locking nut. The rotating buckle method can achieve rapid installation and removal of the track.

[0037] The double-wall single-image radiography method generally performs multiple radiography according to the diameter of the pipeline to be inspected, and the radioactive source and the film are placed at both ends of the pipeline diameter. The existing method is to fix the film with an elastic band after the manual cloth piece, place the radioactive source at the radiography position, and stick it with tape. The above steps are a one-time radiographic cloth piece operation. There are problems such as being unstable and difficult to adjust, and the radioactive source radiography position needs to be re-determined each time the cloth piece is laid. The quick replacement of the film and the radioactive source linkage positioning device adopts a track sliding method, and the sliding module can be quickly moved to the corresponding positioning card slot, and is equipped with a fast fixing position with a bayonet. The film clamping rod can be rotated to the vertical pipe wall, which is convenient for quick replacement of the film. A radioactive source fixing tube with a fixed length and curvature is installed at the center of the film clamping rod, which can be linked to the radiography position with the movement of the sliding module. The design of film replacement and radioactive source linkage is conducive to improving on-site work efficiency and success rate.

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

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

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

[0041] 3) Turn the handle 1 to put the buckle 2 into the slot fixing block 9.

[0042] 4) Loosen the fine-tuning locking nut 4, press the slide rail 7 against the pipe wall until no displacement occurs, and then tighten the fine-tuning locking nut 4 to complete the installation of the slide rail 7.

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

[0044] 6) The slider positioning pin 17 is inserted into the slider positioning hole 31 on the track surface to achieve rapid movement and fixation of the sliding mechanism.

[0045] 7) Rotate the clamping rod to rotate the joint connection bolt 33, so that the bottom plate fixing device 101 is perpendicular to the pipeline surface as a whole, and fix the bottom plate on the bottom plate fixing device 101 through the bottom plate fixing hook.

[0046] 8) Rotate the clamping rod rotating joint, move the first clamping rod rotating joint limit block 18 and the second clamping rod rotating joint limit block 19, rotate the first clamping rod locking screw 11 and the second clamping rod locking screw 12, drive the film clamping rod 34 to rotate, and fix the film on the tube wall.

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

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

Claims

1. A device for quickly replacing negative film and linking positioning of radioactive sources for radiographic inspection of pipeline welds in nuclear power plants, characterized in that: It comprises a slide rail, a film fixing device, a radiation source linkage device and a slide rail locking device, wherein 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 radiation source linkage device.

2. A device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds as claimed in claim 1, characterized in that: The film fixing device comprises a first pressure rod locking screw, a first sliding block, a first pressure rod bracket, a first pressure rod rotation joint limit block, a second pressure rod rotation joint limit block, a first film fixing hook, a second film fixing hook, a first pulley and a film pressure rod, wherein one end of the film pressure rod is connected to the second film fixing hook and the first film fixing hook, and the second film fixing hook and the first film fixing hook are spaced a certain distance apart on the film pressure rod, the middle position of the film pressure rod is connected to the second pressure rod rotation joint limit block, the film pressure rod located on one side of the second pressure rod rotation joint limit block is connected to the first pressure rod rotation joint limit block, the film pressure rod located on one side of the first pressure rod rotation joint limit block is provided with a pressure rod rotation joint connecting bolt, the film pressure rod outside the pressure rod rotation joint connecting bolt is connected to the first pressure rod bracket, the first pressure rod bracket is installed with a first slider, the first slider is installed with a first pulley, and the first pressure rod locking screw passes through the end of the film pressure rod.

3. A device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds as claimed in claim 2, characterized in that: The left and right pressing rods of the film fixing device and the plate connected with the radiation source linkage device are an integrated structure, and the first sliding block and the second sliding block are of the same structure.

4. A device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds as claimed in claim 1, characterized in that: The radiation source linkage device comprises a radiation source linkage elbow, a source fixing clamp and a source fixing screw. One end of the radiation source linkage elbow is connected with a semicircular source fixing clamp, and a source fixing screw is installed on the source fixing clamp. The source fixing screw can be screwed into the source fixing clamp.

5. A device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds as claimed in claim 4, characterized in that: The radioactive source linkage elbow is connected to the film fixing device through the radioactive source linkage elbow bolt, and the source fixing clamp at the other end is the radioactive source placement location.

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

7. A device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds as claimed in claim 6, 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.

8. A device for rapid film replacement and radioactive source linkage positioning for radiographic inspection of nuclear power plant pipeline welds as claimed in 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 to connect to the buckle fixing block, the first fixing nut and the second fixing nut are respectively fixed at both ends of the buckle fixing block, the buckle is also connected to the slot fixing block, the third fixing nut and the fourth fixing nut are respectively fixed at both ends of the slot fixing block, and the end of the buckle is connected to the handle.

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 1, characterized in that: The other end of the slide rail is connected with a slot fixing block, the first pulley and the second pulley are placed on the slide rail, and the third pulley, the fourth pulley and the second sliding block are placed on the slide rail.

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

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