A digital ray detection device

Abstract

The present invention relates to the field of digital ray detection, and discloses a digital ray detection device, including a scanning mechanism, the scanning mechanism is used to scan the inner side of the weld on the pipeline, the scanning mechanism includes a circular track, when the pipeline is detected, the circular track is arranged outside the pipeline and concentric with the pipeline; a ray generator is fixedly installed on the outer wall of the movable part, and is used to scan the physical characteristic information of the weld on the inner wall of the pipeline. The present invention collects the physical characteristic information of a whole circle of welds, and then analyzes the physical characteristic information, and judges the smoothness of the weld by defining a smoothness coefficient. When the set smoothness is not met, the information can be sent to a user terminal for viewing, or the information can be sent to a laser, and the laser is used to hit the defective position, so as to facilitate the maintenance personnel to locate and improve the efficiency of finding the defective position.

Description

Technical Field

[0001] The present invention relates to the technical field of digital ray detection, and in particular to a digital ray detection device. Background Art

[0002] The existing technology uses digital radiographic detection equipment to detect pipeline welds, but the existing detection equipment mainly detects the thickness of the welds and whether there are any cold welds.

[0003] In some chemical and other fields, some chemical liquids will cause corrosion to pipes and welds. If the smoothness of the weld does not meet the requirements and the roughness of the weld position is too large, corrosive liquids will more easily remain in the rough gaps of the weld. After long-term use, the possibility of corrosion at this location will greatly increase. Therefore, it is necessary to effectively detect the smoothness of the weld. Summary of the Invention

[0004] The present invention provides the following technical solutions:

[0005] A digital radiographic inspection device includes a scanning mechanism for scanning the inner side of a weld on a pipeline, the scanning mechanism comprising:

[0006] an annular track, when inspecting the pipeline, the annular track is arranged outside the pipeline and concentric with the pipeline;

[0007] A movable member capable of sliding along the circumferential direction of the annular track;

[0008] A ray generator is fixedly mounted on the outer wall of the movable part and is used to scan the physical characteristic information of the weld on the inner wall of the pipeline;

[0009] An industrial computer is mounted on the outer wall of the movable part. The data collected by the ray generator is sent to the industrial computer. The industrial computer analyzes the collected data in the following steps:

[0010] Divide a whole circle of weld into n areas;

[0011] Analyze the physical characteristics of the weld in each area;

[0012] Determine the abnormal area;

[0013] Divide the abnormal area into several small grids;

[0014] Obtaining coordinate information of small grids with defects;

[0015] As a further solution, the physical feature information is calculated to form smoothness information;

[0016] The smoothness coefficient is calculated using the smoothness information, and the calculation formula is:

[0017] ; (1)

[0018] In the formula:

[0019] Scattering intensity: S is used to represent the scattering intensity of the object surface;

[0020] Maximum scattering intensity: S max It indicates the scattering intensity of the roughest surface acceptable in the test standard under the same conditions;

[0021] Roughness parameter: Use R a Indicates the arithmetic mean roughness of the surface of an object;

[0022] Maximum roughness parameter: use R a,max R represents the roughest surface acceptable in the test standard a value;

[0023] Weight coefficients: W1 and W2 represent weights of the scattering intensity and the unevenness parameter, respectively, and the weight values ​​are obtained by testing the pipeline (300) with various defects;

[0024] As a further solution, the weld thickness influence function is introduced into formula (1), and the weld thickness function g(T) is defined as follows:

[0025] ;

[0026] In this function, if the weld thickness (T) is not less than the minimum value T min , then g(T) returns 1; if the weld thickness is below the minimum value T min , then g(T) returns 0, and the function g(T) is substituted into formula (1) to obtain the new smoothness coefficient:

[0027] ; (2)

[0028] In this new smoothness coefficient formula, if the weld thickness T is not less than T min , then g(T) is 1, the smoothness coefficient remains unchanged, if the weld thickness is lower than T min , then g(T) is 0, and the entire smoothness coefficient will also become 0, which means that the position is a defect position;

[0029] As a further solution, the areas of the n regions are the same.

[0030] As a further option, it also includes:

[0031] A placement rack, the top of which is provided with an arc-shaped groove matching the pipe, and the pipe is placed in the arc-shaped groove;

[0032] A connecting frame is fixedly connected to one end of the annular track, and the other end of the connecting frame is connected to the placement frame.

[0033] As a further solution, an electric telescopic rod is connected between the connecting frame and the placement frame, and during the extension and retraction of the electric telescopic rod, the emitting end of the ray generator is aligned with the weld;

[0034] The industrial computer sends a signal to the electric telescopic rod to drive the scanning mechanism to move along the pipeline to be inspected, and then the characteristic information of the weld is obtained through the ray generator. Since the roughness of the weld and the pipeline is significantly different, when the ray generator passes through the weld with higher roughness, the industrial computer can obtain the information of the path, and then calculate and determine the middle position of the weld through the industrial computer. The industrial computer then sends a signal to the electric telescopic rod to drive the ray generator to stay at the position of the weld so that it can perform a circular scan. Compared with manual placement, it has higher accuracy.

[0035] As a further solution, an annular groove is provided on the outer wall of the annular track, a gear ring is connected to the annular groove, a gear is rotatably installed in the middle of the movable part, one end of the gear is connected to a motor, the output end of the motor is connected to the gear, and the gear is meshed with the gear ring. When the motor drives the gear to rotate, the movable part can move in the circumferential direction of the annular track, and a cover is installed on the outside of the gear.

[0036] As a further solution, a fixed block is connected to the top of the ray generator, the fixed block is connected to the movable part, a laser is connected to the side of the fixed block, and the emission end of the laser is aligned with the weld.

[0037] As a further solution, the scanning mechanism further includes:

[0038] pressurized box;

[0039] An air pump, wherein the air outlet of the air pump is connected to the top of the pressurized box;

[0040] a gas nozzle, wherein the top of the gas nozzle is connected to the pressurized box, and the bottom of the gas nozzle is aligned with the weld;

[0041] By setting up an air pump and an air nozzle, when the weld needs to be inspected, the air nozzle blows out high-pressure gas in the opposite direction of the movement of the ray generator, and the gas can be tangent to the outer wall of the pipe to remove the cold weld debris from the weld on the outer wall of the pipe, thereby ensuring the accuracy of the ray inspection.

[0042] As a further solution, the signal output end of the ray generator is connected to the signal input end of the industrial computer, and the output end of the industrial computer is connected to the signal input end of the motor, the electric telescopic rod, the laser, the air pump and the user terminal.

[0043] Compared with the prior art, the present invention provides a digital ray detection device with the following beneficial effects:

[0044] 1. The present invention determines the smoothness information of the weld by defining a smoothness coefficient, thereby effectively detecting the roughness of the weld in the pipeline, thereby screening out pipelines that meet the requirements to cope with the corrosion of chemical liquids.

[0045] 2. The present invention collects physical characteristic information of a whole circle of welds, analyzes the physical characteristic information, and determines the smoothness of the welds by defining a smoothness coefficient. When the set smoothness is not met, the information can be sent to a user terminal for viewing, or sent to a laser, which can be used to hit the defective position, thereby facilitating positioning by maintenance personnel and improving the efficiency of finding the defective position.

[0046] 3. The present invention uses an industrial computer to send a signal to the electric telescopic rod to drive the scanning mechanism to move along the pipeline to be inspected, and then obtains the characteristic information of the weld through the ray generator. Since the roughness of the weld and the pipeline is significantly different, when the ray generator passes through the weld with higher roughness, the industrial computer can obtain information about the path and then calculate and determine the middle position of the weld. The industrial computer then sends a signal to the electric telescopic rod to drive the ray generator to stay at the position of the weld for circular scanning. Compared with manual placement, it has higher accuracy.

[0047] 4. The present invention is provided with an air pump and an air nozzle. When the weld needs to be inspected, the air nozzle blows out high-pressure gas in the opposite direction of the movement of the ray generator, and the gas can be tangent to the outer wall of the pipeline to remove the cold welding debris of the weld on the outer wall of the pipeline, thereby ensuring the accuracy of the ray detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A three-dimensional diagram of the scanning mechanism of the present invention;

[0049] Figure 2 This is a schematic diagram of the weld expansion of the present invention;

[0050] Figure 3 This is a schematic diagram of a partial area of ​​the weld of the present invention;

[0051] Figure 4 Analyze the flow chart for the present invention;

[0052] Figure 5It is an overall schematic diagram of the present invention;

[0053] Figure 6 A perspective view of the circular track of the present invention;

[0054] Figure 7 is a three-dimensional diagram of the gas nozzle of the present invention;

[0055] Figure 8 A three-dimensional diagram of the movable part of the present invention;

[0056] Figure 9 This is a system block diagram of the present invention.

[0057] In the figure: 100, placement rack; 200, scanning mechanism; 201, ring track; 202, connecting frame; 203, gear ring; 204, movable part; 205, fixed block; 206, ray generator; 207, gear; 208, motor; 209, laser; 210, pressurizing box; 211, air pump; 212, air nozzle; 213, cover; 214, electric telescopic rod; 300, pipeline; 301, weld. DETAILED DESCRIPTION

[0058] See Figure 1-9 :

[0059] like Figure 1 As shown, this embodiment discloses a digital radiographic detection device, including a scanning mechanism 200, wherein the scanning mechanism 200 is used to scan the inner side of a weld 301 on a pipe 300, and the scanning mechanism 200 includes:

[0060] The annular track 201 is configured outside the pipeline 300 and concentric with the pipeline 300 when inspecting the pipeline 300;

[0061] The movable member 204 is capable of sliding along the circumferential direction of the annular track 201;

[0062] A ray generator 206 is fixedly mounted on the outer wall of the movable member 204 and is used to scan the physical characteristic information of the weld 301 on the inner wall of the pipe 300;

[0063] An industrial computer is installed on the outer wall of the movable part 204, and the data collected by the ray generator 206 is sent to the industrial computer;

[0064] like Figure 2 、 Figure 3 、 Figure 4 As shown, the steps for the industrial computer to analyze the collected data are as follows:

[0065] Divide a whole circle of weld 301 into n areas;

[0066] Analyzing physical characteristic information of the weld 301 in each region;

[0067] Determine the abnormal area;

[0068] Divide the abnormal area into several small grids;

[0069] Obtaining coordinate information of small grids with defects;

[0070] By dividing the weld 301 into n areas, when acquiring characteristic information, the ray generator 206 can first be allowed to surround the weld 301 to acquire preliminary information, and then the n areas can be scanned separately in turn, so as to reduce the single calculation amount of the industrial computer, solve the problem of insufficient computing power, and reduce chip costs. In addition, multiple groups of ray generators 206 can be configured to simultaneously acquire characteristic information of the weld 301 in n areas.

[0071] As a possible embodiment, the physical feature information is calculated to form smoothness information;

[0072] The smoothness coefficient is calculated using the smoothness information, and the calculation formula is:

[0073] ; (1)

[0074] In the formula:

[0075] Scattering intensity: S is used to represent the scattering intensity of the object surface;

[0076] Maximum scattering intensity: S max It indicates the scattering intensity of the roughest surface acceptable in the test standard under the same conditions;

[0077] Roughness parameter: Use R a Indicates the arithmetic mean roughness of the surface of an object;

[0078] Maximum roughness parameter: use R a,max R represents the roughest surface acceptable in the test standard a value;

[0079] Weight coefficients: W1 and W2 represent weights of the scattering intensity and the unevenness parameter, respectively. The weight values ​​are obtained by testing the pipeline 300 with various defects.

[0080] As a possible embodiment, when the thickness of the weld 301 is thin, the strength at this position will be significantly reduced. Therefore, the weld thickness influence function is introduced into formula (1), and the weld thickness function g(T) is defined as follows:

[0081] ;

[0082] In this function, if the weld thickness (T) is not less than the minimum value T min , then g(T) returns 1; if the weld thickness is below the minimum value T min , then g(T) returns 0, and the function g(T) is substituted into formula (1) to obtain the new smoothness coefficient:

[0083] ; (2)

[0084] In this new smoothness coefficient formula, if the weld thickness T is not less than T min , then g(T) is 1, the smoothness coefficient remains unchanged, if the weld thickness is lower than T min , then g(T) is 0, and the entire smoothness coefficient will also become 0, which means that the position is a defect position;

[0085] Figure 2 As shown in the figure, as a possible embodiment, the areas of the n regions are the same, so that the amount of calculation required by the industrial computer for each individual region is similar, and the calculation is simplified by using machine learning algorithms, such as neural networks, support vector machines, decision trees, random forests, etc. These algorithms can handle large-scale data concurrency, and by simulating the working method of the human brain, gradually transform from shallow networks to deep networks, extract better feature information, and automatically select feature quantities based on the characteristics of the data;

[0086] It should be noted that before performing defect detection, it is necessary to collect information on the welds 301 on a large number of qualified pipes 300, and optimize the information in combination with actual production needs to obtain a weld smoothness coefficient that meets the quality standards. The information that meets the standards is then entered into the industrial computer. In subsequent inspections, it is compared with the information that meets the standards. When the value of the detected information after the smoothness coefficient calculation is less than the smoothness coefficient of the weld 301 that meets the standards, it is judged to be unqualified, and the unqualified position coordinates are marked, and adjustments are made through machine learning methods.

[0087] like Figure 5 As shown, as a possible embodiment, the detection device further includes:

[0088] The placement rack 100 has an arc-shaped groove on its top that matches the pipe 300, and the pipe 300 is placed in the arc-shaped groove;

[0089] The connecting frame 202 is fixedly connected to one end of the annular track 201 , and the other end of the connecting frame 202 is connected to the placement frame 100 .

[0090] like Figure 1 、 Figure 5As shown, as a possible embodiment, in order to make the ray generator 206 and the weld 301 on the same vertical plane, an electric telescopic rod 214 is connected between the connecting frame 202 and the placement frame 100. During the extension and retraction of the electric telescopic rod 214, the emission end of the ray generator 206 is aligned with the weld 301.

[0091] The industrial computer sends a signal to the electric telescopic rod 214 to drive the scanning mechanism 200 to move along the pipeline 300 to be inspected, and then the ray generator 206 obtains characteristic information of the weld 301. Since the roughness of the weld 301 is significantly different from that of the pipeline 300, when the ray generator 206 passes through the weld 301 with higher roughness, the industrial computer can obtain information about the path. The industrial computer then calculates and determines the middle position of the weld 301. The industrial computer then sends a signal to the electric telescopic rod 214 to drive the ray generator 206 to stay at the position of the weld 301 so as to perform a circular scan thereof. Compared with manual placement, this method has higher accuracy.

[0092] like Figure 6 As shown, as a further solution, an annular groove is provided on the outer wall of the annular track 201, and a gear ring 203 is connected to the annular groove. A gear 207 is rotatably installed in the middle of the movable part 204, and one end of the gear 207 is connected to a motor 208. The output end of the motor 208 is connected to the gear 207, and the gear 207 is meshed with the gear ring 203. When the motor 208 drives the gear 207 to rotate, the movable part 204 can move in the circumferential direction of the annular track 201, and a cover 213 is installed on the outside of the gear 207.

[0093] like Figure 1 As shown, as a possible embodiment, the top of the ray generator 206 is connected to a fixed block 205, the fixed block 205 is connected to the movable part 204, the side of the fixed block 205 is connected to a laser 209, and the emitting end of the laser 209 is aligned with the weld 301.

[0094] like Figure 7 、 Figure 8 As shown, as a possible embodiment, the scanning mechanism further includes:

[0095] pressurized box 210;

[0096] An air pump 211, wherein the air outlet of the air pump 211 is connected to the top of the pressurizing box 210;

[0097] a gas nozzle 212 , wherein the top of the gas nozzle 212 is in communication with the pressurizing box 210 , and the bottom of the gas nozzle 212 is aligned with the weld 301 ;

[0098] During the welding process, although the weld appears flawless on the surface, a cold weld may occur, which may fall off later, causing the welding position to lose its sealing effect on the pipeline 300. Therefore, by setting up an air pump 211 and an air nozzle 212, when it is necessary to inspect the weld 301, the air nozzle 212 blows out high-pressure gas in the opposite direction of the movement of the radiation generator 206, and the gas can be tangent to the outer wall of the pipeline 300, removing the cold weld debris of the weld 301 on the outer wall of the pipeline 300, thereby ensuring the accuracy of the radiographic inspection.

[0099] like Figure 9 As shown, as a possible embodiment, the signal output end of the ray generator 206 is connected to the signal input end of the industrial computer, and the output end of the industrial computer is connected to the signal input end of the motor 208, the electric telescopic rod 214, the laser 209, the air pump 211 and the user terminal.

Claims

1. A digital ray detection device, Features: The invention comprises a scanning mechanism (200), wherein the scanning mechanism (200) is used to scan the inner side of a weld (301) on a pipeline (300), and the scanning mechanism (200) comprises: an annular track (201); when the pipeline (300) is inspected, the annular track (201) is arranged outside the pipeline (300) and is concentric with the pipeline (300); A movable member (204) capable of sliding along the circumferential direction of the annular track (201); A ray generator (206) is fixedly mounted on the outer wall of the movable part (204) and is used to scan the physical characteristic information of the weld (301) on the inner wall of the pipeline (300); An industrial computer is installed on the outer wall of the movable part (204). The data collected by the ray generator (206) is sent to the industrial computer. The industrial computer analyzes the collected data in the following steps: Divide a whole circle of weld (301) into n areas; Analyzing physical characteristic information of the weld (301) in each region; Determine the abnormal area; Divide the abnormal area into several small grids; Obtain the coordinate information of the small grid with defects; The scanning mechanism also includes: Pressurized box (210); An air pump (211), wherein an air outlet end of the air pump (211) is connected to the top of the pressurizing box (210); An air nozzle (212), wherein the top of the air nozzle (212) is connected to the pressurized box (210), and the bottom of the air nozzle (212) is aligned with the weld (301).

2. A digital ray detection device according to claim 1, Features: The physical feature information is calculated to form smoothness information; The smoothness coefficient is calculated using the smoothness information, and the calculation formula is: （1） In the formula: Scattering intensity: S is used to represent the scattering intensity of the object surface; Maximum scattering intensity: S max It indicates the scattering intensity of the roughest surface acceptable in the test standard under the same conditions; Roughness parameter: Use R a Indicates the arithmetic mean roughness of the surface of an object; Maximum roughness parameter: Use R a,max R represents the roughest surface acceptable in the test standard a value; Weight coefficient: W 1 and W 2 They respectively represent the weights of the scattering intensity and the unevenness parameter, and the weight values ​​are obtained by testing the pipeline (300) with various defects.

3. A digital ray detection device according to claim 2, Features: Introduce the weld thickness influence function into formula (1), and define the weld thickness influence function g(T) as follows: ； In this function, if the weld thickness (T) is not less than the minimum value T min , then g(T) returns 1; if the weld thickness is below the minimum value T min , then g(T) returns 0. Substituting the function g(T) into formula (1) yields a new smoothness coefficient: ；（2） In this new smoothness coefficient formula, if the weld thickness T is not less than T min , then g(T) is 1, and the smoothness coefficient remains unchanged. If the weld thickness is lower than T min , then g(T) is 0, and the entire smoothness coefficient will also become 0, which means that the position is a defect position.

4. A digital ray detection device according to claim 2 or 3, Features: The n regions have the same area.

5. A digital ray detection device according to claim 2 or 3, It is characterized in that Also includes: A placement rack (100), the top of which has an arc-shaped groove matching the pipeline (300), and the pipeline (300) is placed in the arc-shaped groove; A connecting frame (202), wherein the connecting frame (202) is fixedly connected to one end of the annular track (201), and the other end of the connecting frame (202) is connected to the placement frame (100).

6. A digital ray detection device according to claim 5, Features: An electric telescopic rod (214) is connected between the connecting frame (202) and the placement frame (100), and during the extension and retraction process of the electric telescopic rod (214), the emission end of the ray generator (206) is aligned with the welding seam (301).

7. A digital ray detection device according to claim 6, Features: An annular groove is formed on the outer wall of the annular track (201), a gear ring (203) is connected to the annular groove, a gear (207) is rotatably mounted in the middle of the movable member (204), one end of the gear (207) is connected to a motor (208), an output end of the motor (208) is connected to the gear (207), the gear (207) is meshed with the gear ring (203), when the motor (208) drives the gear (207) to rotate, the movable member (204) can move in the circumferential direction of the annular track (201), and a cover (213) is mounted on the outside of the gear (207).

8. A digital ray detection device according to claim 7, Features: The top of the ray generator (206) is connected to a fixed block (205), the fixed block (205) is connected to the movable part (204), the side of the fixed block (205) is connected to a laser (209), and the emission end of the laser (209) is aimed at the weld (301).

9. A digital ray detection device according to claim 8, Features: The signal output end of the ray generator (206) is signal-connected to the input end of the industrial computer, and the output end of the industrial computer is signal-connected to the input end of the motor (208), the electric telescopic rod (214), the laser (209), the air pump (211), and the user terminal.

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