Method and device for synchronous ray transillumination of multiple weld joints

Abstract

Provided is a multi-weld synchronous radiographic transillumination device for synchronously detecting multiple welds to be inspected on a plurality of test pieces, comprising a base, a radiographic machine fixing structure, a plurality of test piece fixing structures, and a plurality of film fixing structures, wherein the radiographic machine fixing structure is arranged in the middle of the base, and is used to fix the radiographic machine; the plurality of test piece fixing structures are independently and movably arranged on the base, and are used to fix the test pieces; the plurality of film fixing structures are arranged in pairs with each test piece fixing structure, and are independently and movably arranged relative to the base, and are used to fix the film; wherein the test piece fixing structure and the film fixing structure are arranged to be able to respectively drive the test piece and the film to rotate, and the spacing between each film fixing structure and the test piece fixing structure relative to the radiographic machine is adjustable to adapt to the welds to be inspected on each test piece. The above device can realize multiple types of weld detection at a time, and effectively improve the detection efficiency of welds. Also provided is a multi-weld synchronous radiographic transillumination method.

Description

Technical Field

[0001] The invention relates to the field of welding, and in particular to the field of weld detection. Background Art

[0002] Existing weld inspection generally adopts the method of X-ray transillumination, which is carried out one-to-one, that is, one position of a weld is inspected by one transillumination or multiple positions of a weld are inspected by central transillumination. However, central transillumination has limitations: it is generally only performed on large pipes, and transillumination of small and medium-sized pipes still requires multiple transilluminations of a single weld; in addition, for weld specifications of different pipe diameters and types, single irradiation and repeated rotation are also required, which is inefficient. Summary of the invention

[0003] An object of the present invention is to provide a multi-weld joint synchronous ray transillumination device to realize a single multi-type weld joint detection and effectively improve the weld joint detection efficiency.

[0004] To achieve the above-mentioned purpose, a multi-weld joint synchronous radiographic transillumination device is used for synchronously detecting welds to be inspected on multiple test pieces, and comprises a base, a radiographic machine fixing structure, multiple test piece fixing structures and multiple film fixing structures, wherein the radiographic machine fixing structure is arranged in the middle of the base for fixing the radiographic machine; multiple test piece fixing structures are independently and movably arranged on the base for fixing the test pieces; multiple film fixing structures are arranged in pairs with each of the test piece fixing structures, and are independently and movably arranged relative to the base for fixing the film; wherein the test piece fixing structure and the film fixing structure are arranged to be able to respectively drive the test piece and the film to rotate, and the spacing between each of the film fixing structures and the test piece fixing structures relative to the radiographic machine is adjustable to adapt to the welds to be inspected on each of the test pieces.

[0005] In one or more embodiments, the base includes a plurality of guide rails, and the guide rails are arranged to start from the X-ray machine fixing structure and extend toward the outside of the base.

[0006] In one or more embodiments, the test piece fixing structure includes a guide rail snap-in, a rotating gear ring and a weld clamp, the guide rail snap-in is used to snap into the guide rail, the weld clamp is arranged on the rotating gear ring to fix the test piece, and the rotating gear ring is arranged on the guide rail snap-in to drive the weld clamp to rotate.

[0007] In one or more embodiments, the film fixing structure includes a connecting device, a film conversion device and a film clamp connected in sequence, the connecting device is fixed on the weld clamp, the film clamp is used to fix the film, and the film conversion device is used to drive the film clamp to flip.

[0008] In one or more embodiments, the film conversion device includes a rotating shaft and a transition portion rotating around the rotating shaft, and the film clamp is fixedly arranged on the transition portion.

[0009] In one or more embodiments, the X-ray machine fixing structure includes a fixed connecting gear ring, a three-dimensional movable component and a X-ray machine fixing head connected in sequence, the X-ray machine fixing head is used to fix the X-ray machine, the fixed connecting gear ring is arranged on the base and is configured to be able to rotate, and the three-dimensional movable component is used to adjust the three-dimensional position of the X-ray machine.

[0010] In one or more embodiments, the device further includes a control system, which is bidirectionally signal-connected to the X-ray machine fixing structure, the test piece fixing structure, and the film fixing structure.

[0011] In one or more embodiments, the test piece is a plate-shaped piece and / or a pipe.

[0012] Another object of the present invention is to provide a method for synchronous X-ray radiography of multiple welds, the method comprising the following steps: S1. setting the position of the X-ray machine; S2. setting the focal length of the welds to be inspected on each piece to be tested according to the exposure factor formula; S3. determining the position of each piece to be tested, adjusting the welds to be inspected on each piece to be tested, and adjusting the position of the film; S4. performing film exposure; S5. after a single exposure is completed, the workpiece is transferred, the film is replaced, and step SS is repeated until the end.

[0013] In one or more embodiments, the exposure factor formula is i1×t1 / F1 2 =i2×t2 / F2 2 , where i1 and i2 are the X-ray tube currents, t1 and t2 are the exposure times, i1×t1 and i2×t2 are the exposure amounts, and F1 and F2 are the focal lengths.

[0014] The above-mentioned multi-weld joint synchronous radiographic transillumination device is based on circumferential radiographic transillumination technology. Through central circumferential transillumination, multiple weld joint transillumination positions are set in a star shape at a certain distance. With the automatic rotation and film changing device, it can realize one-time transillumination of multiple welds and welds of various specifications. With the freely movable film fixing structure and the test piece fixing structure, it can be adjusted in real time according to the specifications of the welds to be inspected. If the specifications of the spare parts welds are inconsistent, the exposure will be inconsistent. Different focal lengths are adjusted according to the calculation formula, and the test piece fixing structure and the film fixing structure are arranged to respectively drive the test piece and the film to rotate, so as to realize automatic adjustment of the weld detection position, achieve one-time layout and one-time operation, realize single-time multi-specification weld detection, and automatically complete the entire transillumination process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0016] Figure 1 is a top view of an embodiment of a multi-weld joint synchronous ray transillumination device;

[0017] Figure 2 is a side view of an embodiment of a multi-weld joint synchronous ray transillumination device;

[0018] Figure 3 is a schematic diagram of an embodiment of a fixing structure of a X-ray machine;

[0019] Figure 4 is a schematic diagram of an embodiment of a structure for fixing a piece to be tested and a structure for fixing a film;

[0020] Figure 5 yes Figure 4 A top view of

[0021] Figure 6 It is a flow chart of the method of simultaneous radiographic exposure of multiple welds. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0023] It should be noted that these and other subsequent drawings are only examples and are not drawn to scale, and should not be used to limit the actual scope of protection required by the present invention.

[0024] The multi-weld joint synchronous ray transillumination device disclosed in the present invention can realize simultaneous transillumination of different specifications of weld joints 3 to be inspected on multiple test pieces 4 at one time, and the test piece 4 can be a pipe or a plate. For example, common specifications are 4mm, 8mm, 10mm, 12mm, 16mm, 18mm, 20mm, 30mm and other thickness butt plate welds, or common pipe butt welds with specifications of φ21mm×3mm, φ25mm×3mm, φ30mm×5mm, φ48mm×5mm, φ60mm×8mm, φ89mm×10mm, φ114mm×12mm, φ168mm×12mm, φ273mm×24mm and other common pipe butt welds.

[0025] Reference Figures 1 to 4It is understood that the device includes a base 10 , a X-ray machine fixing structure 20 , a plurality of DUT fixing structures 30 and a plurality of film fixing structures 40 .

[0026] The base 10 is the foundation of the entire transillumination device, and other devices are fixed on the base 10. In some embodiments, the base 10 includes a base body 11 and a plurality of guide rails 12, and the guide rails 12 are arranged to start from the fixed structure 20 of the irradiator and extend toward the outside of the base 10, preferably in a straight line. Figure 1 In the illustrated embodiment, the base 10 is a circular plate or a ring-shaped structure, which is used to support the entire device and stabilize the shape. Those skilled in the art will appreciate that the base 10 may also be in other shapes such as square, rectangular, etc.

[0027] The X-ray machine fixing structure 20 is disposed in the middle of the base 10, preferably in the center of the base 10, and is used to fix the X-ray machine 5 through a structure such as a chuck. Figure 2 and Figure 3 As shown, in some embodiments, the X-ray machine fixing structure 20 includes a fixed connection gear ring 21, a three-dimensional moving component 22 and a X-ray machine fixing head 23 connected in sequence. The fixed connection gear ring 21 is arranged on the base 10 and is arranged to be able to rotate. The X-ray machine fixing head 23 is used to fix the X-ray machine 5 so that the X-ray machine 5 is firmly located at the center of the base 10 and will not move during the transillumination process to cause the X-ray focal length to change.

[0028] The three-dimensional moving component 22 is arranged on the fixed connecting gear ring 21 and has the ability of three-dimensional spatial movement adjustment, and is used to adjust the three-dimensional position of the X-ray machine. Figure 2 As shown, it includes a fixed connecting seat 24, a spatial up-and-down adjusting device 227, a plane left-and-right adjusting device 228 and a plane front-and-back adjusting device 229. The three-dimensional moving component 22 is set on the connecting gear ring 21 through the fixed connecting seat 24. The spatial up-and-down adjusting device 227 is used to adjust the up-and-down height of the X-ray machine 5 so that the X-ray focus of the X-ray machine is located at the center of the weld; the plane left-and-right adjusting device 228 and the plane front-and-back adjusting device 229 are used to adjust the horizontal posture of the X-ray machine so that the X-ray machine 5 is in a horizontal state and the X-ray focus is perpendicular to the plane of the irradiated weld.

[0029] Multiple test piece fixing structures 30 are independently and movably arranged on the base 10 for fixing the test piece 4. Multiple film fixing structures 40 are arranged in pairs with each test piece fixing structure 30 and are independently and movably arranged relative to the base 10 for fixing the film 2 matched with the weld 3 to be inspected.

[0030] As reference Figure 1 and Figure 2As shown, the test piece fixing structure 30 is circumferentially distributed on the base 10, and is generally arranged in multiple radial directions with the center of the base. In some embodiments, the test piece fixing structure 30 includes a guide rail bayonet 31, a rotating gear ring 32, and a weld fixture 33. The guide rail bayonet 31 is used to snap into the guide rail 12 and is perpendicular to the base 10; the rotating gear ring 32 is arranged on the guide rail bayonet 31 to drive the weld fixture 33 to rotate; the weld fixture 33 is arranged on the rotating gear ring 32 to fix the test piece 4.

[0031] Specifically, the guide rail bayonet 31 is fixed on the guide rail 12 of the base fixing device, and the bayonet is rotated by the motor to realize the linear movement of the bayonet along the guide rail direction. The rotating gear ring 32 is set on the guide rail bayonet 31, and the weld joint clamp 33 is connected to the rotating gear ring 32. The rotation of the weld joint clamp 33 is realized by the motor transmission. The adjustment of the weld joint linear distance and the rotation of the transillumination position are realized by the linear movement of the bayonet and the rotation of the weld joint clamp. The cooperation between the guide rail bayonet 31 and the rotating gear ring 32 drives the entire test piece fixing structure 30 to adjust the distance relative to the X-ray machine 5 and the rotation adjustment of the test piece 4 itself.

[0032] On the basis of the above embodiment, the film fixing structure 40 can be directly set on the DUT fixing structure 30, and adjust the distance and the vertical and horizontal states of the DUT fixing structure 30 together. Figure 4 As shown, the film fixing structure 40 is arranged on the side of the weld fixture 33 away from the X-ray machine 5, preferably, it is evenly arranged in the same direction as the test piece fixing structure 30, including a connecting device 41, a film conversion device 42 and a film fixture 43 connected in sequence.

[0033] The connecting device 41 is fixed on the weld fixture 33 and can rotate with the weld fixture 33, and is the basis of the film fixing structure 40. The film fixture 43 is used to fix the film 2. The film conversion device 42 is used to drive the film fixture 43 to flip over, so as to realize the replacement of the film during the transillumination process. In some embodiments, the film conversion device 42 includes a rotating shaft and a transfer part rotating around the rotating shaft. The film fixture 43 is fixedly arranged on the transfer part. When the transfer part is flipped up, the film 2 can stick to the tube wall of the test piece 4, and the X-ray detection can be performed. After the detection is completed, the transfer part is flipped down, such as Figure 4 In the direction P shown, the bottom sheet 2 is separated from the weld.

[0034] In addition, the film fixing structure 40 may not be directly set on the test piece fixing structure 30, but may be independently and movably set on the base 10, and the relative position with the test piece 4 and the test weld 3 may be adjusted in real time according to the specifications of the test weld.

[0035] In some embodiments, the device further includes a control system, which is bidirectionally connected to the X-ray machine fixing structure, the test piece fixing structure, and the film fixing structure. The control system automatically rotates the transillumination position and replaces the film by controlling the circular motion of the weld 3 to be inspected and the replacement of the film, thereby realizing automatic indexing, automatic film replacement, and automatic exposure. After one exposure is completed, the weld fixing device automatically rotates to the next film position according to the system preset, and the film fixing device rotates synchronously at the same time, and the conversion device replaces the film fixture. After the film replacement is completed, the next exposure transillumination is automatically started.

[0036] The test piece fixing structure 30 and the film fixing structure 40 are configured to respectively drive the test piece 4 and the film 2 to rotate, and the spacing between each film fixing structure 40 and the test piece fixing structure 30 relative to the X-ray machine is adjustable to adapt to the welds to be inspected on each test piece 4. Specifically, according to the exposure factor formula i1×t1 / F1 2 =i2×t2 / F2 2 , where i1 and i2 are the X-ray tube currents, t1 and t2 are the exposure times, i1×t1 and i2×t2 are the exposure amounts, and F1 and F2 are the focal lengths, to obtain the focal lengths of different welds to be inspected.

[0037] If the specifications of the welds to be inspected are consistent, the same transillumination method is used, the exposure is consistent, and the same focal length can be set. If the specifications of the welds to be inspected are inconsistent, such as different pipe diameters and different weld thicknesses, the exposure is inconsistent, and different focal lengths need to be set. The focal lengths of the spare welds with different transillumination thicknesses under the same blackness are calculated according to the exposure factor formula and different settings are made to ensure consistent blackness.

[0038] For example, the specifications of the welds to be inspected are 12mm, 14mm, 20mm plate butt welds and φ21mm×3mm, φ30mm×5mm, φ60mm×8mm pipe butt welds that need to be simultaneously exposed. Assuming the focal length F0 is 700mm, when the same equipment, current, and voltage are used, the required exposure times are t1, t2, t3, t4, t5, and t6. Then, when the same equipment, current, voltage, and exposure time t3 are used, the focal lengths required to be set for the welds to be inspected are (490000×t3÷t1) 0.5 mm, (490000×t3÷t2) 0.5 mm, 700mm, (490000×t3÷t4) 0.5 mm, (490000×t3÷t5) 0.5 mm, (490000×t3÷t6) 0.5 mm, thus ensuring that all welds of all specifications to be inspected are exposed and finished at the same time, avoiding the limitation of using the same focal length and requiring separate exposure work, thus improving inspection efficiency.

[0039] The above-mentioned device utilizes the principle of circumferential transillumination and arranges the welds in the circumferential direction to realize transillumination of multiple welds in a single time. At the same time, it is equipped with automatic indexing and automatic film changing functions to realize one-time setting and multi-position transillumination of the welds. In addition, the above-mentioned X-ray transillumination device can simultaneously perform inspections on welds of the same specification, such as determining the focal length based on the inverse square law and the relationship between exposure and distance, and can also perform simultaneous transillumination of welds of different specifications. The required focal lengths of welds of different specifications can be calculated and adjusted according to the formula, thereby realizing synchronous inspection of welds of multiple specifications in a single time and effectively improving the weld inspection efficiency.

[0040] Combined with the above introduction to the multi-weld synchronous radiography device, a multi-weld synchronous radiography method can also be understood, including the following steps: S1. Setting the position of the radiograph; S2. Setting the focal length of the weld to be inspected on each piece to be tested according to the exposure factor formula; S3. Determining the position of each piece to be tested, and adjusting the distance between the weld to be inspected on each piece to be tested and the film; S4. Exposing the film; S5. After a single exposure is completed, shifting the workpiece, replacing the film, and repeating steps S1-S4 until the end.

[0041] Specifically, in S1, the multi-weld synchronous X-ray transillumination device is placed horizontally at the exposure site, a circumferential exposure X-ray machine is used and fixed on the X-ray machine fixing device, the space adjustment device is adjusted so that the X-ray machine is located at the center of the base and perpendicular to the plane of the base, the X-ray machine is fixed, and the high-voltage cable is connected.

[0042] In step S1, the weld positions to be inspected may be divided according to the inspection process, and the corresponding positions of the plurality of weld positions to be inspected may be directed toward the film fixing device in advance, and the distance from the film may be adjusted and pre-fixed.

[0043] In S2, the exposure factor formula is i1×t1 / F1 2 =i2×t2 / F2 2 , where i1 and i2 are the X-ray tube currents, t1 and t2 are the exposure times, i1×t1 and i2×t2 are the exposure amounts, and F1 and F2 are the focal lengths. After obtaining the focal length information, determine the position of each piece to be tested, and adjust the distance between the weld to be tested and the film on each piece to be tested. For example, arrange the film and adjust the position of the fixed structure of the piece to be tested. Arrange the film on the film fixing device so that the weld image is basically located at the center of the film, close to the weld to be tested and fixed, and adjust the distance between the film and the center of the X-ray machine according to the process focal length requirements.

[0044] After the film arrangement is completed, the exposure control system sends a film exposure command, the X-ray machine high voltage is turned on, and the film is exposed. The exposure time is executed according to the process requirements of the inspection object. After a single exposure is completed, the workpiece is manually transferred and the film is replaced to prepare for the next exposure. More preferably, after the exposure is completed, the control system sends a transfer and film replacement command for the weld to be inspected, the weld to be inspected is moved to the center of the next film position, and the film is replaced with an unexposed film to prepare for the next exposure.

[0045] After the transfer and film change are completed, the above steps S1-S4 are repeated, and the film exposure command is sent through the control system. The high voltage of the X-ray machine is turned on for exposure again. The exposure time is executed according to the process requirements of the inspection object until the requirements are met, and the Korean weld transmission process is ended.

[0046] The above method utilizes the principle of circumferential ray transillumination, and realizes single-time multi-weld transillumination through the ray machine fixing device, the weld fixing device and the film fixing device, and realizes weld rotation and film replacement through the control system, and finally realizes one-time setting, multi-weld transillumination, and multi-position transillumination. Compared with single-time single-weld transillumination, the efficiency has been qualitatively improved. At the same time, the program controls the weld rotation to realize multi-position transillumination, which reduces the time for the middleman to rotate the weld and replace the film, and further improves the efficiency. The program controls the precise setting of the position, improves the transillumination environment, and reduces the transillumination deviation.

[0047] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0048] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A multi-weld joint synchronous ray transillumination device, used for synchronously detecting a plurality of weld joints (3) to be inspected on a plurality of test pieces (4), characterized in that: include: Base (10); A X-ray machine fixing structure (20), arranged in the middle of the base (10) and used for fixing the X-ray machine (5); A plurality of test piece fixing structures (30) are independently and movably arranged on the base (10) and are used to fix the test piece (4); as well as A plurality of film fixing structures (40), arranged in pairs with each of the test piece fixing structures (30), and independently and movably arranged relative to the base (10), for fixing the film (2); The test piece fixing structure (30) and the film fixing structure (40) are configured to respectively drive the test piece (4) and the film (2) to rotate, and the spacing between each of the film fixing structures (40) and the test piece fixing structure (30) relative to the X-ray machine is adjustable to fit the welds to be inspected on each of the test pieces (4); The base (10) includes a plurality of guide rails (12), and the guide rails (12) are arranged to start from the X-ray machine fixing structure (20) and extend toward the outside of the base (10); The test piece fixing structure (30) comprises a guide rail snap-in (31), a rotating gear ring (32) and a weld joint clamp (33); the guide rail snap-in (31) is used to snap into the guide rail (12) and is perpendicular to the base (10); the weld joint clamp (33) is arranged on the rotating gear ring (32) and is used to fix the test piece (4); the rotating gear ring (32) is arranged on the guide rail snap-in (31) and is used to drive the weld joint clamp (33) to rotate.

2. The multi-weld joint synchronous ray transillumination device according to claim 1, characterized in that: The film fixing structure (40) comprises a connecting device (41), a film conversion device (42) and a film clamp (43) which are connected in sequence, the connecting device (41) is fixed on the weld clamp (33), the film clamp (43) is used to fix the film (2), and the film conversion device (42) is used to drive the film clamp (43) to flip.

3. The multi-weld joint synchronous ray transillumination device according to claim 2, characterized in that: The film conversion device (42) comprises a rotating shaft and a transfer portion rotating around the rotating shaft, and the film clamp (43) is fixedly arranged on the transfer portion.

4. The multi-weld joint synchronous ray transillumination device according to claim 1, characterized in that: The X-ray machine fixing structure (20) comprises a fixed connection gear ring (21), a three-dimensional moving component (22) and a X-ray machine fixing head (23) which are connected in sequence, the X-ray machine fixing head (23) is used to fix the X-ray machine (5), the fixed connection gear ring (21) is arranged on the base (10) and is arranged to be able to rotate, and the three-dimensional moving component (22) is used to adjust the three-dimensional position of the X-ray machine.

5. The multi-weld joint synchronous ray transillumination device according to claim 1, characterized in that: The device also includes a control system which is bidirectionally signal-connected with the X-ray machine fixing structure, the test piece fixing structure and the film fixing structure.

6. The multi-weld joint synchronous ray transillumination device according to claim 1, characterized in that: The piece to be tested is a plate-shaped piece and / or a pipe piece.

7. A method for synchronous radiographic transillumination of multiple welds, characterized in that: The method is carried out using the device according to any one of claims 1 to 6, comprising the steps of: S1. Set the position of the X-ray machine; S2. Setting the focal length of the weld to be inspected on each test piece according to the exposure factor formula; S3. Determine the position of each part to be tested, adjust the welds to be tested on each part to be tested, and adjust the film position; S4. performing film exposure; S5. After a single exposure is completed, the workpiece is transferred, the film is replaced, and steps S1-S4 are repeated until the end.

8. The method for synchronous radiographic transillumination of multiple welds according to claim 7, characterized in that: The exposure factor formula is i1×t1 / F1 2 =i2×t2 / F2 2 , where i1 and i2 are the X-ray tube currents, t1 and t2 are the exposure times, i1×t1 and i2×t2 are the exposure amounts, and F1 and F2 are the focal lengths.

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