Device for attaching welding seam radiographic inspection film and use method

Abstract

The invention discloses a device for attaching a welding seam radiographic inspection film and a use method. The device comprises a centering patch mechanism and a crawling mechanism, a centering shaft of the centering chip mounting mechanism is arranged at the upper end of a height rod; the hidden bag attaching ring is located at the front end of the centering shaft and fixedly connected with the outer circumferential surface of the centering shaft through a connecting piece. The centering disc is fixed to the front end face of the centering shaft. And the height rod is a telescopic rod, and the height of the centering shaft can be adjusted according to shells with different inner diameters, so that the requirements of welding seam detection of the shells with different specifications are met. When transillumination is carried out, the film is pushed to the front sealing head body through the device, the device is installed at the correct position through the centering and locking device, it is guaranteed that the shell and the film do not move relatively during ray irradiation, the accuracy of the device is guaranteed, and compared with manual blind vision patch in the same scene, the rework rate is reduced, and the detection efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of ray detection, in particular to a device and a method for attaching a film to a ray detection position of a weld seam of a front end head of a shell. Background Art

[0002] Metal shell is a kind of pressure-bearing shell, which is mostly welded by joints, heads, shells, etc. Since metal shells are subjected to extremely high internal pressure during operation, strict inspection requirements are imposed on the quality of welds, and generally 100% radiographic inspection is required. If the weld inspection technology cannot meet the requirements, it will cause excessive defects to be missed, which will inevitably threaten the quality and safety of the shell and lead to major quality problems.

[0003] The weld of the head body is the weld that is most prone to cracks, lack of fusion and other hazardous defects among the metal shell welds. This weld is located on the ellipsoidal surface of the head body. It is also the weld that is most difficult to detect. Generally, it is required to carry out X-ray detection in the component state and after the final welding and heat treatment. When it is in the component state, the detection is more convenient, and the source-inside single-wall transillumination process is adopted, that is, the radiation source is arranged on the inside of the head body, and the film is attached and arranged on the outside of the head body. After the final welding and heat treatment, the front head body is connected to the shell. Most shells have a large aspect ratio, and the radiation source cannot be arranged on the inside of the front head body. Only the source-outside single-wall transillumination process can be adopted, that is, the radiation source is outside during transillumination, and the film is attached inside, leaving only a single-layer wall image on the film. The common method of inspecting the weld of the head body is to manually attach the film. The operator holds a magnet and a dark bag containing the film, enters the shell from the front opening of the head body, and puts the dark bag on the inner surface of the weld. At the same time, the magnet is placed behind the dark bag and the dark bag is tightly fitted with the weld. Because the opening diameter is generally small, when manually attaching the film, the staff can only operate with one hand and cannot observe visually. They can only work by feel and experience. The film attachment work is difficult and uncertain. It is easy to have incomplete film coverage of the weld, film bending and deformation affecting weld imaging, and film loose fitting. This not only reduces the detection sensitivity, but also causes unnecessary rework and reduces the detection efficiency.

[0004] Search for relevant patents:

[0005] At present, in the field of radiographic detection technology, due to the differences in the shapes and structural characteristics of the detection objects, there are various radiographic detection auxiliary devices, among which there are also film attachment devices used for metal shells, such as "Attachment method and structure for radiographic detection of pipe welds" (publication number: CN 102279198 A), "Radiographic detection auxiliary device and detection method for ring welds of shells in narrow spaces" (publication number: CN 116148280 A), a special patch fixture and use method for radiographic detection of water-cooled wall welds (publication number: CN 110297004 A), a patch installation auxiliary device for radiographic detection (CN 217717559U), an inner wall circumferential patch device based on single-wall external transmission method of ring welds (publication number: CN 209247661 U), an auxiliary device for fast film for radiographic detection of stainless steel tank wall plate welds (publication number: CN 217901601 U), a patch device for on-site radiographic detection of power plant boilers (publication number: CN 216743719U), etc. These inventions cover the devices and methods of auxiliary patches for radiographic detection of different products in different scenarios, including the devices and methods of auxiliary patches for radiographic detection of welds of metal products.

[0006] A typical example is the invention disclosed in the publication number CN 116148280 A, which discloses a radiographic detection auxiliary device and detection method for the ring weld of a shell in a narrow space. Figure 1 As shown, the invention includes a fixing plate and a conveying rod, a radiation dark bag is arranged on the fixing plate, and a radiation film is installed in the radiation dark bag; one end of the conveying rod is connected to the fixing plate, and the radiation dark bag on the fixing plate is conveyed into the shell through the conveying rod, so that the radiation film therein is attached to the inner wall of the shell. The device can easily and efficiently deliver the radiation film into the narrow space in the tube.

[0007] However, the auxiliary patch device and method involved in the invention can only be used for the shell ring weld, and cannot be used to attach film to the weld of the front head body. Moreover, the device cannot cover the entire weld, and it is impossible to complete the detection of the entire weld in one radiography. The following is a detailed description of the differences between the shell ring weld and the front head body weld:

[0008] There is a big difference between the head body weld and the shell girth weld. The shell girth weld is located on the straight shell and is the weld at the connection between the barrel sections. It is a regular circular shape, and its end face is perpendicular to the shell centerline. The film is easier to fit, and there are many related auxiliary patch devices. The head body weld is located on the ellipsoidal surface of the head body, and is deeper. It is the weld with the greatest detection difficulty. Generally, it is required to perform radiographic detection in the component state and after the final assembly welding and heat treatment. Among them, the radiographic detection after the final assembly welding and heat treatment has always been a difficult point. In the component state, the detection is more convenient, and the source is arranged inside the single-wall transillumination process, that is, the radiation source is arranged on the inside of the head body, and the film is attached and arranged on the outside of the head body. After the final assembly welding and heat treatment, the front head body is connected to the shell. Most shells have a large aspect ratio, and the radiation source cannot be arranged on the inside of the front head body. Only the source is outside the single-wall transillumination process can be used, that is, the radiation source is outside during transillumination, and the film is attached inside, leaving only a single-layer wall image on the film. The common method of detecting the weld of the head body is to manually attach the film. The operator holds a magnet and a dark bag containing the film, enters the shell from the front opening of the head body, and puts the dark bag on the inner surface of the weld. At the same time, the magnet is placed behind the dark bag and the dark bag is tightly fitted with the weld. Because the opening diameter is generally small, when attaching the film manually, the staff can only operate with one hand and cannot observe visually. They can only work by feel and experience. The film attachment work is difficult and uncertain. It is easy to have incomplete film coverage of the weld, film bending and deformation affecting weld imaging, and film loose fitting. This not only reduces the detection sensitivity, but also causes unnecessary rework and reduces the detection efficiency.

[0009] Based on the difficulty in attaching the X-ray detection film to the weld of the front head of the metal shell, there is no related invention to disclose the auxiliary film attaching device and method.

[0010] The retrieved inventions are different from the present invention in terms of both principle and structural features, and cannot be used to solve the technical problem to be solved by the present invention. Summary of the invention

[0011] In order to overcome the shortcomings of great difficulty and high uncertainty in film affixing during radiographic inspection of the weld of the front head body of the metal shell, such as incomplete film coverage of the weld, bending and deformation of the film affecting weld imaging, and loose film adhesion, resulting in low detection sensitivity, much unnecessary rework, and low detection efficiency, the present invention proposes a device for attaching weld radiographic inspection film and a method for use.

[0012] The device for attaching weld radiographic inspection film proposed in the invention includes a centering patch mechanism and a crawling mechanism; the centering patch mechanism includes a centering shaft, a centering disk, a dark bag fitting ring, a dark bag fixing plate and a locking card plate; the crawling mechanism includes a height rod and a vehicle body. The centering shaft is embedded and fixed in a connector located at the upper end of the height rod. The dark bag fitting ring is located at the front end of the centering shaft and is fixedly connected to the outer circumferential surface of the centering shaft through four evenly distributed connecting plates. The centering disk is fixed on the front end face of the centering shaft. The height rod is a telescopic rod, which can adjust the height of the centering shaft according to shells of different inner diameters to meet the needs of weld inspection of shells of different specifications. The height rod is located at the front end of the vehicle body.

[0013] The centering patch mechanism also includes a locking clamping plate; the locking clamping plate is located on the front end surface of the centering disk and is sleeved on the locking bolt through a thread.

[0014] The outer circumferential surface of the rear end of the centering shaft is symmetrically processed with two planes that match the connecting piece.

[0015] The diameter of the centering disk is the same as the diameter of the opening of the front head body end surface on the shell, and the clearance between the two is matched.

[0016] Positioning pin holes for installing concealed bag fitting rings of different diameters are evenly distributed on each connecting piece.

[0017] The hidden bag fitting ring is in the shape of a ring, and its outer diameter is 60-100 mm smaller than the inner diameter of the shell. A radially protruding hidden bag fixing sheet is distributed on the circumference of the hidden bag fitting ring.

[0018] The vehicle body is in the shape of an I-beam and is welded together by a front beam, a rear beam and a connecting rod. Rollers are respectively installed on the front beam and the rear beam of the vehicle body. A fixing seat for a height rod is provided on the upper surface of the connecting rod near one end of the front beam. A connecting piece for connecting the centering shaft is provided on the top end surface of the height rod; the cross section of the connecting piece is in the shape of a concave letter. A push-pull rod holder is provided on the outer surface of the rear beam for installing the push-pull rod of the crawling mechanism so that it can move forward in the housing.

[0019] Or back off.

[0020] The specific process of attaching the film using the device proposed by the present invention is:

[0021] Step 1, preparation before testing:

[0022] The preparation of the detector includes adjusting the height of the centering patch mechanism, replacing the centering disk, replacing the dark bag bonding ring and preparing the film. The preparation work before the test is completed.

[0023] The height of the centering patch mechanism is adjusted by adjusting the height of the height rod so that the center line of the centering patch mechanism coincides with the center line of the shell.

[0024] The method of replacing the dark bag fitting ring is to install the positioning pins of the dark bag fitting ring with the same diameter as the annular weld of the front head body into the positioning pin holes on the connecting piece respectively, so that the dark bag fitting ring is fitted on the weld of the front head body of the shell.

[0025] The preparation of the film is to attach the detection film to the dark bag bonding ring; it is divided into full weld detection and weld partial detection.

[0026] When the whole weld is inspected, a rectangular dark bag filled with film is pasted on the edge of the circumference of the dark tape fitting ring, and each dark bag is clamped and fixed by a dark bag fixing sheet. Each dark bag is located at the front end surface of the dark tape fitting ring, and adjacent dark bags are overlapped; the overlapping circumference is 1 to 5 cm.

[0027] When the weld is partially inspected, the dark bag is closely attached to the front end surface of the dark bag attachment ring according to the number of inspection points;

[0028] Each of the hidden bags is clamped and fixed by a hidden bag fixing sheet.

[0029] Step 2: Send the patch device to the front head body:

[0030] Place the patch device into the shell from the opening of the rear head of the shell, and push it to the front head body until the centering disk is embedded in the opening of the front head body.

[0031] Step 3: Install the locking card:

[0032] The locking clamp is located on the outer end surface of the front head body of the shell, and the centering disk is firmly embedded in the front head body of the shell by rotating the locking clamp.

[0033] Step 4: Arrange transillumination marks:

[0034] A center mark, an overlap mark and an image quality meter are arranged in the transillumination area of ​​the front head body.

[0035] When the weld is locally inspected, the transillumination mark corresponds to the film at the weld point, the center mark position corresponds to the center of the film, the overlap mark corresponds to both sides of the film, 10 to 50 mm away from the edge, and the image quality meter is arranged in the corresponding coverage area of ​​the film and perpendicular to the weld.

[0036] When the entire weld is inspected, the arrangement of the center mark, overlap mark, and image quality meter is the same as that of the partial inspection, and corresponds to the position of each film respectively.

[0037] Step 5, ray source arrangement:

[0038] A single-wall single-image irradiation process with the X-ray source outside is adopted. When the ray source is arranged, the ray is pointed vertically to the center of the irradiated part, and the distance from the ray source to the weld is 800mm to 900mm.

[0039] When the entire weld is inspected, the X-ray source is aligned with the center axis of the shell; when a partial weld is inspected, the X-ray source is aligned with the target position.

[0040] Step 6, transillumination:

[0041] Set the radiation source voltage to 75-100 kV, the current to 8-10 mA, and the irradiation time to 3-4 min.

[0042] When testing the front head of a shell with a diameter of 400 mm, the thickness of the weld area is 2.8 mm, the voltage is set to 75 kV, the current is 8 mA, and the exposure time is 3 minutes;

[0043] When testing the front head of a shell with a diameter of 500 mm, the thickness of the weld area is 3.1 mm, the voltage is set to 80 kV, the current is 8.5 mA, and the exposure time is 3 minutes;

[0044] When testing the front head of a shell with a diameter of 550 mm, the thickness of the weld area is 3.8 mm, the voltage is set to 100 kV, the current is 10 mA, and the exposure time is 4 minutes;

[0045] After the settings are completed, turn on the X-ray machine and perform transirradiation according to the set parameters.

[0046] Step 7: After the transillumination is completed, remove the locking card:

[0047] After the transillumination is completed, the locking card is removed, the patch device is moved back to the rear end, the dark bag is removed, and the transillumination work is completed.

[0048] The present invention pushes the patch device from the rear end to the front end body through a push-pull rod with adjustable length. When performing transillumination, the dark bag containing the film is arranged according to the fixed position mark and fixed on the dark bag fitting ring of the patch device, the patch device is placed into the shell from the opening of the rear end of the shell, the push-pull rod is used to push the device from the rear end to the front end, the centering and locking device is used to install the device in the correct position, and it is ensured that the shell and the film do not move relative to each other during irradiation, and the patch device is pulled out through the push-pull rod device after the irradiation is completed.

[0049] The weld of the head body is located on the ellipsoidal surface of the head body. It is also the weld with the greatest difficulty in detection. Generally, it is required to carry out X-ray detection in the component state and after the final welding and heat treatment. In the component state, the detection is more convenient, and the source-inside single-wall transillumination process is adopted, that is, the radiation source is arranged on the inside of the head body, and the film is attached and arranged on the outside of the head body. After the final welding and heat treatment, the front head body is connected to the shell. Most shells have a large aspect ratio, and the radiation source cannot be arranged on the inside of the front head body. Only the source-outside single-wall transillumination process can be adopted, that is, the radiation source is outside during transillumination, and the film is attached inside, leaving only a single-layer wall image on the film.

[0050] The present invention has the following effects:

[0051] 1. The patching operation of the shell front head body weld radiographic inspection is completed through the auxiliary patching device, avoiding blind patching by the operator when visual observation is not possible;

[0052] 2. Through the detachable centering 4, locking card plate, three fixations are achieved: the dark bag containing the film is tightly fixed with the dark belt fitting ring of the patch device; the relative position of the patch device and the shell is fixed; the film is in close contact with the weld of the front head body;

[0053] 3. It has three sets of detachable and replaceable dark bag fitting rings, centering discs, and a telescopic height rod, making the patch device suitable for products with shell diameters of 400mm, 500mm and 550mm, and completing the patch work for radiographic detection of the weld seam of the head body;

[0054] 4. Through the cooperation of the connecting bolts, fixing bolts and the height rod with telescopic function, the centering patch mechanism in the device does not deflect at different heights, ensuring the accuracy of the device;

[0055] Compared with manual blind patching in the same scenario, it reduces the rework rate and effectively improves the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is the structural diagram of the device disclosed in CN 116148280 A.

[0057] Figure 2 It is a schematic diagram of the three-dimensional structure of the patch device used in the preferred embodiment of the present invention.

[0058] Figure 3 It is a front view of the patch device used in the preferred embodiment of the present invention.

[0059] Figure 4 It is a left view of the patch device used in the preferred embodiment of the present invention.

[0060] Figure 5It is a top view of the patch device used in the preferred embodiment of the present invention.

[0061] Figure 6 It is a structural schematic diagram of the centering patch mechanism of the patch device used in the preferred embodiment of the present invention.

[0062] Figure 7 It is a side view of the centering patch mechanism of the patch device used in the preferred embodiment of the present invention.

[0063] Figure 8 It is a comparison chart of the rework rates of the preferred embodiment of the present invention using the patch-to-patch device and the manual attachment method.

[0064] In the figure: 1. Concealed bag fitting ring; 2. Concealed bag fixing plate; 3. Connecting plate; 4. Centering plate; 5. Centering shaft; 6. Locking bolt; 7. Locking clamp; 8. Connecting bolt; 9. Fixing bolt; 10. Height rod; 11. Car body; 12. Roller; 13. Push-pull rod holder; 14. Transillumination rework rate of manual patch; 15. Film rework rate of manual patch; 16. Transillumination rework rate of the patch of the present invention; 17. Film rework rate of the patch of the present invention.

[0065] Specific example method

[0066] This embodiment is a device used for attaching radiographic inspection film to the front head weld of the shell, including a centering patch mechanism and a crawling mechanism; the centering shaft 5 in the centering patch mechanism is embedded in the connecting piece at the upper end of the height rod 10 in the crawling mechanism, and is fixed by connecting bolts 8 and fixing bolts 9.

[0067] The centering patch mechanism includes a dark bag fitting ring 1, a dark bag fixing plate 2, a connecting plate 3, a centering plate 4, a centering shaft 5, a locking bolt 6 and a locking clamp 7; wherein the dark bag fitting ring is located at the front end of the centering shaft and is fixedly connected to the outer circumferential surface of the centering shaft through four evenly distributed connecting plates 3. The centering plate is fixed to the front end face of the centering shaft through the locking bolt 6. Two planes are symmetrically processed on the outer circumferential surface of the rear end of the centering shaft, and each plane is a positioning surface that cooperates with the connecting piece.

[0068] The center of the centering plate has a screw hole 6 for installing the locking bolt. Positioning pin holes for installing dark bag fitting rings of different diameters are evenly distributed on each connecting piece.

[0069] The hidden bag fitting ring 1 is annular, and its outer diameter is 60-100 mm smaller than the inner diameter of the shell. A radially protruding hidden bag fixing sheet 2 is distributed on the circumference of the hidden bag fitting ring.

[0070] The diameter of the centering disk is the same as the diameter of the opening of the end face of the front head body on the shell, and a clearance fit is made between the two.

[0071] The locking clamp is located at the front end surface of the centering disk and is threadedly mounted on the locking bolt 6 .

[0072] The crawling mechanism includes a height rod 10, a vehicle body 11, rollers 12 and a push-pull rod holder 13. The vehicle body is in an I-shape and is welded by a front beam, a rear beam and a connecting rod. Rollers are respectively installed on the front beam and the rear beam of the vehicle body. A height rod is provided on the upper surface of the connecting rod near one end of the front beam, and a connecting piece for connecting the centering shaft is provided on the top end face of the height rod; the cross section of the connecting piece is a concave shape. The height rod is a telescopic rod, which can adjust the height of the centering shaft according to the shells with different inner diameters to meet the needs of shell weld detection of different specifications. A push-pull rod holder 13 is provided on the outer surface of the rear beam, which is used to install the push-pull rod of the crawling mechanism so that it can move forward or backward in the shell.

[0073] This embodiment also proposes a method for detecting the radiation of the shell front head body weld using the patch device. According to the design requirements, the radiation detection of the shell front head body weld includes full weld detection and weld partial detection.

[0074] The specific process is:

[0075] Step 1, preparation before testing:

[0076] ⅰ Adjust the height of the centering patch mechanism:

[0077] According to the diameter of the shell to be detected, the center line of the centering patch mechanism is raised to different heights by adjusting the height of the height rod 10 to coincide with the center line of the shell to be detected.

[0078] In this embodiment, the diameter D of the shell is 500 mm, and the height of its center line is 250 mm.

[0079] Adjust the height of the center line of the centering patch mechanism to 250mm so that it coincides with the center line of the shell.

[0080] For three types of shells with shell diameters of 400mm, 500mm and 550mm respectively, the center axis height of the centering patch mechanism is raised to 200mm, 250mm and 275mm respectively so as to coincide with the center axis of the shell.

[0081] ⅱReplace the centering disc:

[0082] According to the different diameters of the shell to be tested, the centering disk 4 of appropriate size is replaced so that it can be embedded in the opening of the front head body of the shell. Specifically, the centering disk 4 is assembled onto the locking bolt 6 and tightened radially along the locking bolt 6 until it rests on the centering shaft 5.

[0083] For the three shells with shell diameters of 400mm, 500mm and 550mm respectively, the opening diameters of the front head body are 110mm, 150mm and 200mm respectively, and the corresponding outer diameters of the centering plates are 109.5mm, 149.5mm and 199.5mm respectively.

[0084] ⅲReplace the hidden bag fitting ring:

[0085] According to the different diameters of the shell to be tested, a suitable dark bag fitting ring 1 is selected, and the positioning pins on the back of the dark bag fitting ring 1 are respectively installed into the positioning pin holes on the connecting piece, so that the dark bag fitting ring 1 can fit on the weld of the front head body of the shell.

[0086] For the three shells with shell diameters of 400mm, 500mm and 550mm respectively, the diameters of the annular weld of the front head body are 340mm, 400mm and 450mm respectively. Therefore, the sizes of the corresponding hidden band fitting rings correspond to them, and the ring diameters are 340mm, 400mm and 450mm respectively.

[0087] ⅳPrepare film:

[0088] The preparation of the film is to attach the detection film to the dark bag bonding ring, which is divided into full weld detection and partial weld detection.

[0089] When the full weld is inspected, a rectangular dark bag filled with film is pasted on the edge of the circumference of the dark tape fitting ring, and each dark bag is clamped and fixed by the dark bag fixing piece 2. Each dark bag is located at the front end surface of the dark tape fitting ring, and adjacent dark bags are overlapped; the overlapping circumference is 1 to 5 cm. Each dark bag is clamped and fixed by the dark bag fixing piece 2.

[0090] When the weld is partially inspected, the dark bags are tightly fitted to the front end surface of the dark bag fitting ring according to the number of inspection points; and each dark bag is clamped and fixed by the dark bag fixing sheet 2 .

[0091] At this point, the preparations before testing are completed.

[0092] Step 2: Send the patch device to the front head body:

[0093] The patch device is placed into the shell from the rear end opening of the shell, and the push-pull rod is used to push the device to the front end until the centering plate 4 is embedded in the front end opening. The roller 11 is a one-way wheel to ensure the linearity of the moving route of the patch device. The push-pull rod is a retractable long rod with an adjustable length within the range of 500mm to 2500mm.

[0094] Step 3: Install the locking card:

[0095] The locking clamp 7 is installed on the locking bolt 6 and is located at the outer end surface of the shell front head body. The locking clamp 7 is rotated to firmly embed the centering disk 4 in the shell front head body, so that the dark bag on the dark bag fitting ring 1 is tightly, wrinkle-free and continuously fitted on the weld of the shell front head body.

[0096] Step 4: Arrange transillumination marks:

[0097] A center mark, an overlap mark and an image quality meter are arranged in the transillumination area of ​​the front head body in a conventional manner.

[0098] When the weld is locally inspected, the transillumination mark corresponds to the film at the weld point, the center mark position corresponds to the center of the film, the overlap mark corresponds to both sides of the film, 10 to 50 mm away from the edge, and the image quality meter is arranged in the corresponding coverage area of ​​the film and perpendicular to the weld.

[0099] When the entire weld is inspected, the arrangement of the center mark, overlap mark, and image quality meter is the same as that of the partial inspection, and corresponds to the position of each film respectively.

[0100] Step 5, ray source arrangement:

[0101] The source is external single wall single shadow transillumination process. When the whole weld is inspected, the X-ray source is aligned with the central axis of the shell; when the weld is partially inspected, the X-ray source is aligned with the target position. When arranging the radiation source, the radiation is vertically pointed to the center of the transillumination part, and the distance from the radiation source to the weld is 800mm to 900mm.

[0102] Step 6, transillumination:

[0103] Set the radiation source voltage to 75-100 kV, the current to 8-10 mA, and the irradiation time to 3-4 min.

[0104] When testing the front head of a shell with a diameter of 400 mm, the thickness of the weld area is 2.8 mm, the voltage is set to 75 kV, the current is 8 mA, and the exposure time is 3 minutes;

[0105] When testing the front head of a shell with a diameter of 500 mm, the thickness of the weld area is 3.1 mm, the voltage is set to 80 kV, the current is 8.5 mA, and the exposure time is 3 minutes;

[0106] When testing the front head of a shell with a diameter of 550 mm, the thickness of the weld area is 3.8 mm, the voltage is set to 100 kV, the current is 10 mA, and the exposure time is 4 minutes;

[0107] After the settings are completed, turn on the X-ray machine and perform transirradiation according to the set parameters.

[0108] Step 7: After the transillumination is completed, remove the locking card:

[0109] After the transillumination is completed, the locking card is removed, the patch device is moved back to the rear end, the dark bag is removed, and the transillumination work is completed.

[0110] like Figure 8 As shown, it is the comparison result of the rework rate of the manual attachment method and the attachment method of the present invention. The results show that the rework rate of the attachment method of the present invention is significantly lower than that of the manual patch, and the attachment method of the present invention does not have the problems of incomplete weld transillumination, image deformation, film bending, etc. The number of films used in the two methods in this comparison is 30, and the number of transilluminations is 6 times. During the rework, the manual attachment method reworked 8 films, transilluminated 5 times, the film rework rate was 26.7%, and the transillumination rework rate was 83.3%; the attachment method of the present invention reworked 2 films, transilluminated 2 times, the film rework rate was 6.7%, and the transillumination rework rate was 33.3%. Figure 8 It shows that the transillumination rework rate of the manual patch is 14 and the film rework rate are much higher than the transillumination rework rate of the patch of the present invention is 16 and the film rework rate is 17. It can be seen that the rework rate of the present invention is greatly reduced, the rework situation is significantly reduced, and the X-ray detection efficiency is effectively improved.

Claims

1. A device for attaching weld radiographic inspection film, characterized in that: It comprises a centering patch mechanism and a crawling mechanism; the centering patch mechanism comprises a centering shaft (5), a centering plate (4), a hidden bag fitting ring (1), a hidden bag fixing plate (2) and a locking clamp (7); the crawling mechanism comprises a height rod (10) and a vehicle body (11); wherein the centering shaft is embedded and fixed in a connecting piece located at the upper end of the height rod; the hidden bag fitting ring is located at the front end of the centering shaft and is fixedly connected to the outer circumferential surface of the centering shaft through four evenly distributed connecting plates (3); the centering plate is fixed on the front end face of the centering shaft; the height rod is a telescopic rod, which can adjust the height of the centering shaft according to shells of different inner diameters to meet the needs of shell weld detection of different specifications; the height rod is located at the front end of the vehicle body.

2. The device for attaching weld radiographic inspection film according to claim 1, characterized in that: The centering patch mechanism also includes a locking clamping plate (7); the locking clamping plate is located on the front end surface of the centering disk and is sleeved on the locking bolt (6) through a thread.

3. The device for attaching weld radiographic inspection film according to claim 1, characterized in that: The outer circumferential surface of the rear end of the centering shaft is symmetrically processed with two planes that match the connecting piece; The diameter of the centering plate is the same as the diameter of the opening of the front head body end surface on the shell, and the clearance between the two is matched; Positioning pin holes for installing concealed bag fitting rings of different diameters are evenly distributed on each connecting piece; The hidden bag fitting ring (1) is in the shape of a circular ring, and its outer diameter is 60-100 mm smaller than the inner diameter of the shell; radially protruding hidden bag fixing sheets (2) are distributed on the circumference of the hidden bag fitting ring.

4. The device for attaching weld radiographic inspection film according to claim 1, characterized in that: The vehicle body is in an I-shape and is welded together by a front beam, a rear beam and a connecting rod; rollers are respectively installed on the front beam and the rear beam of the vehicle body; a fixing seat of a height rod is provided on the upper surface of the connecting rod close to one end of the front beam, and a connecting piece for connecting the centering shaft is provided on the top end surface of the height rod; the cross section of the connecting piece is in a concave shape; a push-pull rod holder (13) is provided on the outer surface of the rear beam for installing the push-pull rod of the crawling mechanism so that the push-pull rod can move forward or backward in the shell.

5. A method of using the device as claimed in claim 1, characterized in that: The specific process is: The specific process is: Step 1, preparation before testing: The preparation of the detector includes adjusting the height of the centering patch mechanism, replacing the centering disk, replacing the dark bag bonding ring and preparing the film; completing the preparation work before the test; Step 2: Send the patch device to the front head body: The patch device is placed into the shell through the opening of the rear end cover of the shell, and pushed to the front end cover until the centering plate (4) is embedded in the opening of the front end cover; Step 3: Install the locking card: The locking clamp is located on the outer end surface of the front head body of the shell, and the centering disc (4) is firmly embedded in the front head body of the shell by rotating the locking clamp (7); Step 4: Arrange transillumination marks: Arrange a center mark, an overlap mark and an image quality indicator in the transillumination area of ​​the front head body; Step 5, ray source arrangement: The single-wall single-shadow transillumination process with the X-ray source outside is adopted. When arranging the radiation source, the radiation is vertically pointed to the center of the transillumination part, and the distance from the radiation source to the weld is 800mm to 900mm; Step 6, transillumination: Set the X-ray source voltage to 75-100 kV, the current to 8-10 mA, and the exposure time to 3-4 minutes; Step 7: After the transillumination is completed, remove the locking card: After the transillumination is completed, the locking card is removed; the patch device is retracted to the rear end; the dark bag is removed, and the transillumination work is completed.

6. The method of using the device according to claim 1, characterized in that: The height of the centering patch mechanism is adjusted by adjusting the height of the height rod (10) so that the center line of the centering patch mechanism coincides with the center line of the shell; The replacement of the dark bag fitting ring is to install the positioning pins of the dark bag fitting ring (1) with the same diameter as the annular weld of the front head body into the positioning pin holes on the connecting piece, so that the dark bag fitting ring (1) is fitted on the weld of the front head body of the shell; the preparation of the film is to attach the film for detection to the dark bag fitting ring; it is divided into full weld detection and partial weld detection.

7. The method of using the device according to claim 6, characterized in that: When the entire weld is inspected, a rectangular dark bag filled with film is pasted on the edge of the circumference of the dark belt fitting ring, and each dark bag is clamped and fixed by a dark bag fixing sheet (2); each dark bag is located on the front end surface of the dark belt fitting ring, and adjacent dark bags are overlapped; The overlapping perimeter is 1 to 5 cm; When the weld is partially inspected, the dark bag is closely attached to the front end surface of the dark bag attachment ring according to the number of inspection points; Each of the hidden bags is clamped and fixed by a hidden bag fixing sheet (2).

8. The method of using the device according to claim 1, characterized in that: When the weld is locally inspected, the transillumination mark corresponds to the film at the weld point, the center mark position corresponds to the center of the film, the overlap mark corresponds to both sides of the film, 10 to 50 mm from the edge, and the image quality meter is arranged in the corresponding coverage area of ​​the film and perpendicular to the weld; When the entire weld is inspected, the arrangement of the center mark, overlap mark, and image quality meter is the same as that of the partial inspection, and corresponds to the position of each film respectively.

9. The method of using the device according to claim 1, characterized in that: When the entire weld is inspected, the X-ray source is aligned with the center axis of the shell; when a partial weld is inspected, the X-ray source is aligned with the target position.

10. The method of using the device according to claim 1, characterized in that: When testing the front head of a shell with a diameter of 400 mm, the thickness of the weld area is 2.8 mm, the voltage is set to 75 kV, the current is 8 mA, and the exposure time is 3 minutes; When testing the front head of a shell with a diameter of 500 mm, the thickness of the weld area is 3.1 mm, the voltage is set to 80 kV, the current is 8.5 mA, and the exposure time is 3 minutes. When testing the front head of a shell with a diameter of 550 mm, the thickness of the weld area is 3.8 mm, the voltage is set to 100 kV, the current is 10 mA, and the exposure time is 4 minutes; After the settings are completed, turn on the X-ray machine and perform transirradiation according to the set parameters.

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