A device and method for accurately adjusting the probe arm of a fixed X-ray machine

Abstract

The present invention provides a device and method for accurately adjusting the probe arm of a fixed X-ray machine, comprising a machine base, a sliding probe arm is arranged on the machine base, the probe arm extends into the interior of a steel pipe, the steel pipe rests on a rotating tire, a measuring device is arranged on one side of the machine base, the measuring device comprises a height measuring device and a distance measuring device, the height measuring device is provided with a first laser emitter that slides vertically, the distance measuring device is provided with a sliding sleeve that slides horizontally, and a second laser emitter that can rotate is provided on the sliding sleeve; the steel pipe and the rotating tire have two contact points, the height measuring device is used to measure the height of the contact point between the steel pipe and the rotating tire from the ground, and the distance measuring device is used to measure the distance between the two contact points between the steel pipe and the rotating tire. The use of the height measuring device and the distance measuring device adopts theoretical calculation plus precision measurement, which can accurately calculate the horizontal height to which the probe arm should be adjusted, avoiding the phenomenon of causing the focal length to be too large or too small. At the same time, image distortion is avoided, resulting in the phenomenon of missed detection of linear defects.

Description

Technical Field

[0001] The present invention relates to the field of nondestructive radiation testing, and in particular to a device and method for accurately adjusting a probe arm of a fixed X-ray machine. Background Art

[0002] With the development of non-destructive testing technology and the continuous improvement of quality control requirements, the steel pipe manufacturing industry currently basically uses X-ray industrial television detection equipment to conduct 100% X-ray detection of the entire weld of the steel pipe. When performing non-destructive testing on submerged arc welded spiral steel pipes, some steel pipe manufacturers use DR or CR ray detection technology, but their working principles basically adopt the arrangement of the image receiving device and the ray source in a vertical state, so that the steel pipe weld is controlled by the transport trolley to rotate synchronously through the X-ray source window to achieve 100% inspection of the entire weld. The mechanical control part is generally arranged in a fixed flaw detection corridor, the X-ray generator is suspended by the probe arm, the steel pipe is placed on the transport trolley, and the required inspection part is passed through the image receiving window by controlling the movement and rotation of the transport trolley. The dynamic or static detection of the steel pipe weld is completed in a flow-line operation. The steel pipes produced have different specifications and there are slight differences between each steel pipe. When the next steel pipe is replaced after the steel pipe inspection is completed, the focal length between the ray generator and the inspected workpiece will be different. This requires the probe arm supporting the X-ray generator to be adjusted to different heights as required, so as to obtain the required ray penetration focal length.

[0003] The probe arm adjustment in the prior art determines the focal length by visual inspection by human eyes, and the probe arm cannot be accurately adjusted to the center of the steel pipe. The observation angle is also limited by the on-site environment. The probe arm lifting button is nearly 15 meters away from the X-ray tube, which causes the inspector to adjust the probe arm lifting result to be subjectively affected, and it is easy to cause the X-ray tube to be not in the center of the steel pipe, thereby forming an eccentric penetration method including the source, resulting in a reduction in the effective length of the weld image, a decrease in detection sensitivity, and an increase in the K value from 1 to about 1.1, which is easy to cause missed detection of transverse cracks. For this reason, we propose a fixed X-ray machine precise probe arm adjustment device and method to solve the above problems.

[0004] Chinese patent document CN101975787B records the probe arm device of the spiral welded pipe X-ray detection machine, which is composed of a probe arm lifting device installed above the probe arm translation device and a probe arm body installed on the probe arm lifting device. The present invention has two adjustable and optional functions for the internal quality X-ray ray detection of the weld of large spiral welded steel pipes and straight welded steel pipes, namely, upper illumination and side illumination, which solves the technical problem that the probe arm device of the existing spiral welded pipe X-ray detection machine can only adapt to the single function of upper illumination or side illumination of the weld and has poor practicality, thereby improving the performance of X-ray in the field of large steel pipe weld detection, improving the detection speed and reducing the detection cost. However, the device cannot accurately adjust the probe arm to the center of the steel pipe, and the inspector's adjustment of the probe arm lifting result is subjectively affected, which easily causes the ray tube to be not in the center of the steel pipe, resulting in a reduction in the effective length of the weld image, a reduction in the detection sensitivity, and an increase in the K value from 1 to about 1.1, resulting in the situation of missed detection of transverse cracks. There are defects in use and improvement is needed. Summary of the invention

[0005] The present invention provides a device and method for accurately adjusting the probe arm of a fixed X-ray machine, which solves the problem that the focal length cannot be accurately positioned when the steel pipe is adjusted. The inspector can only estimate the approximate position of the probe arm by visual inspection, and cannot accurately determine the focal length, which easily causes the X-ray tube to be not at the center of the steel pipe, resulting in a reduction in the effective length of the weld image, a decrease in the detection sensitivity, and an increase in the K value from 1 to about 1.1, thereby leading to the problem of missed detection of linear defects such as cracks at the heel of the weld.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a device and method for accurately adjusting the probe arm of a fixed X-ray machine, comprising a machine base, a sliding probe arm is arranged on the machine base, the probe arm extends into the interior of a steel pipe, the steel pipe is against a rotating tire, a measuring device is arranged on one side of the machine base, the measuring device comprises a height measuring device and a distance measuring device, a first laser emitter that slides vertically is arranged on the height measuring device, a sliding sleeve that slides horizontally is arranged on the sliding sleeve, and a second laser emitter that can rotate is arranged on the sliding sleeve;

[0007] There are two contact points between the steel pipe and the tire. The height measuring device is used to measure the height of the contact point between the steel pipe and the tire from the ground, and the distance measuring device is used to measure the distance between the two contact points between the steel pipe and the tire.

[0008] In a preferred solution, a slide rail is provided on the machine base, the probe arm is installed on a lifting slider, a plurality of pulleys are provided on the lifting slider, and the pulleys abut against the slide rail.

[0009] In a preferred solution, a servo motor is installed on the top of the machine base, a main screw is provided at one end of the servo motor, and the main screw is threadedly connected to a screw seat on the lifting slider.

[0010] In a preferred solution, a trolley is installed at the bottom of the steel pipe, a plurality of tires are arranged on the trolley, two tire rotating wheels are arranged on the tire, and the steel pipe abuts against the two tire rotating wheels.

[0011] In a preferred solution, an X-ray generator is provided at one end of the probe arm, a fixing frame is provided at one side of the probe arm, a fixing bracket is provided on the top of the fixing frame, a DR receiver is provided on the fixing bracket, and the DR receiver is located directly above the X-ray generator.

[0012] In a preferred embodiment, the height measuring device is vertically mounted on the ground, and includes a base, a guide column and a first screw rod are provided on the base, a sliding seat is provided on the first screw rod, a first laser emitter is provided on the sliding seat, a threaded hole is provided on the sliding seat, the threaded hole is threadedly connected to the first screw rod, the guide column rests on the sliding hole of the sliding seat, a vertical scale is provided on the guide column, and a first motor is provided on the base.

[0013] In a preferred solution, the distance measuring device is horizontally arranged on the ground, and the distance measuring device includes two fixed blocks, a guide column and a second screw rod are arranged between the fixed blocks, the second screw rod is threadedly connected to the threaded through hole on the sliding sleeve, a second motor is arranged on one of the fixed blocks, the output end of the second motor is connected to the second screw rod, and a horizontal scale is arranged on the guide column.

[0014] In the preferred solution, an annular groove is provided on the sliding sleeve, a rotating sleeve is provided on the sliding sleeve, one end of the rotating sleeve is against the annular groove, an inner gear ring is provided on the other end of the rotating sleeve, a driving motor is provided at one end of the sliding sleeve, a gear is provided on the output shaft of the driving motor, the gear is meshed with the inner gear ring, and a second laser emitter is provided on the rotating sleeve.

[0015] In a preferred solution, the height measuring device generates a transverse laser line, and the distance measuring device generates a longitudinal laser line.

[0016] A method for quickly aligning a probe arm of a fixed X-ray machine, the method comprising: S1, preparation before measurement: determining the steel pipe specification, measuring the height of the probe arm from the ground, the radius R of the steel pipe, returning the slide seat on the height measuring device to zero, returning the sliding sleeve of the distance measuring device to zero, driving the trolley to allow the probe arm to extend into the steel pipe, opening the rolling track of the trolley, and dropping the steel pipe onto the rotating tire, where the steel pipe and the rotating tire have two contact points A and B;

[0017] S2. Measure the height of the contact point between the tire wheel and the steel pipe, drive the first motor so that the horizontal laser line emitted by the first laser emitter covers point A or B, and read the value on the vertical scale as H. 转胎高度 ;

[0018] S3. Roughly adjust the position of the second laser emitter: drive the second motor so that the second laser emitter is roughly located below point A, and turn on the drive motor so that the longitudinal laser line emitted by the second laser emitter intersects with the transverse laser line;

[0019] S4, measure the distance between the two contact points A and B between the steel pipe and the tire: drive the second motor to make the longitudinal laser line cover point A, record the value L1 on the transverse scale, drive the second motor again to make the longitudinal laser line cover point B, record the value L2 on the transverse scale, the distance between the tire contact points A and B L=L1-L2;

[0020] S5. Calculate the d of the steel pipe 凹陷深度 :Use the Pythagorean theorem to calculate h, h= ;

[0021] d 凹陷深度 =Rh;

[0022] h is the height from the contact point A to the axis of the steel pipe, d is the height from the contact point A to the lowest point of the steel pipe,

[0023] S6. Calculate the height S of the steel pipe axis from the ground, S = H 转胎高度 + Rd 凹陷深度 ;

[0024] S7. Input the height S into the computer and drive the servo motor to rotate so that the probe arm is lifted to the position at the height S on the ground. The adjustment of the probe arm is completed.

[0025] The beneficial effects of the present invention are as follows: the present invention adopts theoretical calculation plus precision measurement, and the height measuring device and the distance measuring device are used in combination, which can accurately measure the horizontal height of the axis line of the steel pipe, and can accurately calculate the horizontal height to which the probe arm should be adjusted, without being limited to the difference in the specifications and dimensions of the steel pipe and the wall thickness of individual steel pipes. It is relatively simple and convenient, and avoids the phenomenon that the focal length is too large or too small due to the adjustment of the probe arm by traditional technology. At the same time, it avoids the phenomenon that the image is distorted and the linear defect is missed due to the limitations of the process. The traditional adjustment adopts the visual method to adjust the probe arm, and the process only writes a range value for the focal length. There is no reference object in the process of adjustment. The adjustment state of the probe arm is affected by personal subjectivity. There is only one person in the position to complete the adjustment and lane changing work. The entire X-ray trolley has many cables, and the ray tube is 15 meters away from the button of the probe arm system. It is not convenient to observe the state of the probe arm near the steel pipe. Therefore, the original method of adjusting the probe arm has hidden dangers. The new method improves the adjustment of the probe arm from the two aspects of work efficiency and process quality improvement, which is suitable for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0027] Figure 1 It is a front view of the overall structure of the present invention;

[0028] Figure 2 It is a right side view of the overall structure of the present invention;

[0029] Figure 3 It is a right side view of the local structure of the present invention;

[0030] Figure 4 It is a front view of the local structure of the present invention;

[0031] Figure 5 is a front view of the height measuring device of the present invention;

[0032] Figure 6 is a cross-sectional view of a distance measuring device of the present invention;

[0033] Figure 7 It is a schematic diagram of the steel pipe measurement of the present invention;

[0034] In the figure: base 1; slide rail 101; lifting slider 2; pulley 201; probe arm 3; measuring device 4; height measuring device 5; base 501; guide column 502; first screw rod 503; slide seat 504; threaded hole 505; first laser emitter 506; vertical scale 507; first motor 508; distance measuring device 6; fixed block 601; guide column 602; second screw rod 603; sleeve 604; rotating sleeve 605; inner gear ring 606; drive motor 607; gear 608; horizontal scale 609; second motor 610; second laser emitter 611; tire swivel 7; tire swivel wheel 701; steel pipe 8; trolley 9; bracket 10; fixed bracket 11; DR receiver 12; X-ray generator 13; ground 14; main screw rod 15; drive motor 16; horizontal laser line 17; longitudinal laser line 18; fixed bracket 19. DETAILED DESCRIPTION

[0035] Embodiment 1:

[0036] like Figure 1-7 A device and method for precisely adjusting a probe arm of a fixed X-ray machine, comprising a machine base 1, a sliding probe arm 3 is arranged on the machine base 1, the probe arm 3 extends into a steel pipe 8, the steel pipe 8 rests on a rotating tire 7, a measuring device 4 is arranged on one side of the machine base 1, the measuring device 4 comprises a height measuring device 5 and a distance measuring device 6, a first laser emitter 506 that slides vertically is arranged on the height measuring device 5, a sliding sleeve 604 that slides horizontally is arranged on the sliding sleeve 604, and a second laser emitter 611 that can rotate is arranged on the sliding sleeve 604;

[0037] The steel pipe 8 has two contact points with the rotating tire 7, the height measuring device 5 is used to measure the height of the contact point between the steel pipe 8 and the rotating tire 7 from the ground 14, and the distance measuring device 6 is used to measure the distance between the two contact points between the steel pipe 8 and the rotating tire 7. According to this structure, the driving motor 16 is turned on to rotate the main screw rod 15, so that the lifting slide block 2 slides on the machine base 1, so that the probe arm 3 is lifted and lowered relative to the ground 14, so as to realize the lifting and lowering function of the probe arm 3.

[0038] The height measuring device 5 is vertically fixed on the ground 14. When the height measuring device 5 is installed, it presents a certain tilt angle, so that the first laser emitter 506 emits a transverse laser line 17 that roughly illuminates the contact point between the tire rotating wheel 701 and the steel pipe 8. The transverse laser line 17 is horizontal, and the first motor 508 is driven to make the slide 504 slide vertically, so that the first laser emitter 506 on the slide 504 can accurately measure the vertical height H of the contact points A and B. 转胎高度 .

[0039] The distance measuring device 6 is horizontally installed on the ground 14. The direction of the second screw rod 603 in the distance measuring device 6 is perpendicular to the central axis direction of the steel pipe 8. The driving motor 607 is turned on to rotate the rotating sleeve 605 on the sliding sleeve 604, so that the second laser emitter 611 on the rotating sleeve 605 rotates. The second laser emitter 611 emits a longitudinal laser line 18, which is a vertical line. Since the measuring device 4 is located at the bottom of the steel pipe 8 and a certain distance away from the horizontal plane of the steel pipe 8, when the size of the steel pipe 8 changes, the position of the longitudinal laser line 18 in the circumferential direction of the laser line changes greatly. When the driving motor 607 is turned on for adjustment, the longitudinal laser line 18 can be preliminarily adjusted to the steel pipe 8 or the tire wheel 701. Then the second motor 610 is started to slide the sliding sleeve 604 on the second screw rod 603, so that the longitudinal laser line 18 covers the contact point A or the contact point B, so as to accurately measure the distance L between A and B.

[0040] Through the distance L between the radius R, A and B of the steel pipe 8, h = , and then use h and the radius R of the steel pipe 8 to obtain d 凹陷深度， Finally, calculate the height S of the centerline of the steel pipe 8 from the ground 14, S = H 转胎高度 + Rd 凹陷深度 The height value of the steel pipe 8 can be accurately measured by the height measuring device 5 and the distance measuring device 6, so as to achieve the purpose of accurately and quickly determining the focal length and adjusting the probe arm.

[0041] The present invention adopts theoretical calculation plus precision measurement, which can accurately calculate the horizontal height of the probe arm 3, without being limited to the difference in the specifications and dimensions of the steel pipe 8 and the wall thickness of the individual steel pipe 8. It is relatively simple and convenient, and avoids the phenomenon that the focal length is too large or too small due to the traditional technology of adjusting the probe arm 3. At the same time, it avoids the phenomenon that the image is distorted and the linear defect is missed due to the limitations of the process. The traditional adjustment adopts the visual method to adjust the probe arm 3, and the focal length is only written as a range value in the process. There is no reference object in the process of adjustment. The adjustment state of the probe arm 3 is affected by personal subjectivity. There is only one person in the position to complete the adjustment and lane changing work. The entire X-ray trolley has many cables, and the ray tube is 15 meters away from the system button of the probe arm 3. It is not convenient to observe the state of the image probe arm 3 near the steel pipe. Therefore, the original method of adjusting the probe arm 3 has hidden dangers. The new method improves the adjustment of the probe arm from the two aspects of work efficiency and process quality improvement, which is suitable for promotion and use.

[0042] In the preferred solution, a slide rail 101 is provided on the machine base 1, and the probe arm 3 is installed on the lifting slider 2. The lifting slider 2 is provided with a plurality of pulleys 201, and the pulleys 201 abut against the slide rail 101. With this structure,

[0043] In the preferred solution, a servo motor 16 is installed on the top of the machine base 1, and a main screw 15 is provided at one end of the servo motor 16, and the main screw 15 is threadedly connected to the screw seat on the lifting slider 2. According to this structure, the driving motor 16 is turned on to rotate the main screw 15, so that the lifting slider 2 slides on the machine base 1, so that the probe arm 3 is lifted relative to the ground 14, so as to realize the function of lifting and lowering the probe arm 3. At the same time, the servo motor 16 drives the main screw 15, and cooperates with the computer. The servo motor 16 rotates a certain number of circles, and the main screw 15 is lifted and lowered a certain distance, which can accurately adjust the height of the probe arm 3 and realize the function of precise adjustment.

[0044] In the preferred solution, a trolley 9 is installed at the bottom of the steel tube 8, and a plurality of rotating tires 7 are arranged on the trolley 9, and two rotating tire wheels 701 are arranged on the rotating tire 7, and the steel tube 8 abuts against the two rotating tire wheels 701. With this structure, the plurality of rotating tires 7 support the trolley 9, and the rotating tire wheels 701 on the rotating tire 7 support the steel tube 8, and the steel tube 8 has contact points A and B with the two rotating tire wheels 701, respectively.

[0045] In the preferred solution, an X-ray generator 13 is provided at one end of the probe arm 3, a fixing frame 19 is provided at one side of the probe arm 3, a fixing bracket 11 is provided at the top of the fixing bracket 19, a DR receiver 12 is provided on the fixing bracket 11, and the DR receiver 12 is located directly above the X-ray generator 13. With this structure, real-time ray imaging is a test method in which the generated image can be observed while the ray is being transilluminated. The most important process of this method is to use a fluorescent screen to convert the ray and light. After the ray source passes through the steel pipe 8, an image is formed on the fluorescent screen detector. After being photographed by a television camera, the image is displayed directly or after being processed by a computer and displayed on a television monitor screen to evaluate the internal quality of the workpiece. Since the exposure fields of steel pipes of different specifications are different, the DR receiver 12 must correct and repair the bad points and background. If the focal length of the DR receiver 12 changes too much, the DR receiver 12 cannot accurately reflect the difference in the image caused by a slight change in the focal length, which is easy to cause the missed detection of linear defects such as cracks at the heel of the weld. The present invention avoids the phenomenon of missing detection of linear defects such as cracks at the heel of the weld by accurately adjusting the height of the probe arm 3 .

[0046] In the preferred embodiment, the height measuring device 5 is vertically installed on the ground 14, and the height measuring device 5 includes a base 501, on which a guide column 502 and a first screw rod 503 are provided, on which a slide 504 is provided, on which a first laser emitter 506 is provided, on which a threaded hole 505 is provided, which is threadedly connected to the first screw rod 503, the guide column 502 rests on the slide hole of the slide 504, the guide column 502 is provided with a vertical scale 507, and on the base 501 a first motor 508 is provided. With this structure, the height measuring device 5 is vertically fixed on the ground 14. When the height measuring device 5 is installed, it presents a certain tilt angle, so that the first laser emitter 506 emits a transverse laser line 17 that roughly illuminates the contact point between the tire wheel 701 and the steel pipe 8. The transverse laser line 17 is horizontal, and the first motor 508 is driven to make the slide 504 slide vertically, so that the first laser emitter 506 on the slide 504 can accurately measure the vertical height H of the contact points A and B. 转胎高度 .

[0047] In the preferred solution, the distance measuring device 6 is horizontally arranged on the ground 14, and the distance measuring device 6 includes two fixed blocks 601, and a guide column 602 and a second screw rod 603 are arranged between the fixed blocks 601, and the second screw rod 603 is threadedly connected with the threaded through hole on the sliding sleeve 604, and a second motor 610 is arranged on one of the fixed blocks 601, and the output end of the second motor 610 is connected with the second screw rod 603, and a horizontal scale 609 is arranged on the guide column 602. With this structure, the distance measuring device 6 is horizontally installed on the ground 14, and the direction of the second screw rod 603 in the distance measuring device 6 is perpendicular to the central axis direction of the steel pipe 8, and the driving motor 607 is turned on to rotate the rotating sleeve 605 on the sliding sleeve 604, so as to rotate the second laser emitter 611 on the rotating sleeve 605. The second laser emitter 611 emits a longitudinal laser line 18, and the longitudinal laser line 18 is a vertical line. Since the measuring device 4 is located at the bottom of the steel pipe 8 and at a certain distance from the horizontal plane of the steel pipe 8, when the size specifications of the steel pipe 8 change, the position of the longitudinal laser line 18 in the circumferential direction of the laser line changes significantly. Only when the drive motor 607 is turned on for adjustment can the longitudinal laser line 18 be preliminarily adjusted to the steel pipe 8 or the tire wheel 701.

[0048] In the preferred solution, an annular slide groove is provided on the sliding sleeve 604, a rotating sleeve 605 is provided on the sliding sleeve 604, one end of the rotating sleeve 605 is against the annular slide groove, the other end of the rotating sleeve 605 is provided with an inner gear ring 606, one end of the sliding sleeve 604 is provided with a driving motor 607, the output shaft of the driving motor 607 is provided with a gear 608, the gear 608 is meshed with the inner gear ring 606, and a second laser emitter 611 is provided on the rotating sleeve 605. With this structure, the second motor 610 is started again to make the sliding sleeve 604 slide on the second screw rod 603, so that the longitudinal laser line 18 covers the contact point A or the contact point B, so as to accurately measure the distance L between A and B.

[0049] In the preferred solution, the height measuring device 5 generates a transverse laser line 17, and the distance measuring device 6 generates a longitudinal laser line 18. With this structure, the direction of the transverse laser line 17 is horizontal, and the direction of the longitudinal laser line 18 is vertical. The transverse laser line 17 and the longitudinal laser line 18 are used in combination to accurately confirm the positions of the contact points A and B, so as to calculate the height S of the axis line of the steel pipe 8 from the ground 14 by reading the vertical scale 507 and the transverse scale 609 through theoretical calculation, S=H 转胎高度 +Rd 凹陷深度 The height value of the steel pipe 8 can be accurately measured by the height measuring device 5 and the distance measuring device 6, so as to achieve the purpose of accurately and quickly determining the focal length and adjusting the probe arm.

[0050] Embodiment 2:

[0051] Combined with Example 1, further illustrate, as Figures 1 to 7A method for quickly adjusting the probe arm of a fixed X-ray machine, the steps of which are: preparation before measurement: determine the specifications of a steel pipe 8, measure the height of the probe arm 3 from the ground 14, the radius R of the steel pipe 8, return the slide 504 on the height measuring device 5 to zero, return the sliding sleeve 604 of the distance measuring device 6 to zero, drive the trolley 9 to allow the probe arm 3 to extend into the steel pipe 8, open the rolling path of the trolley 9, and drop the steel pipe 8 onto the rotating tire 7, where there are two contact points A and B between the steel pipe 8 and the rotating tire 7; measure the height of the contact point between the rotating tire wheel 701 and the steel pipe 8, drive the first motor 508 to allow the horizontal laser line 17 emitted from the first laser emitter 506 to cover point A or B, and read the value H on the vertical scale 507 转胎高度 ;

[0052] Roughly adjust the position of the second laser emitter 611: drive the second motor 610 so that the second laser emitter 611 is roughly located at the lower side of point A, and turn on the drive motor 607 so that the longitudinal laser line 18 emitted by the second laser emitter 611 intersects with the transverse laser line 17; S4, measure the distance between the two contact points A and B between the steel pipe 8 and the tire 7: drive the second motor 610 so that the longitudinal laser line 18 covers point A, record the value L1 on the transverse scale 609, drive the second motor 610 again so that the longitudinal laser line 18 covers point B, record the value L2 on the transverse scale 609, and the distance L between the contact points A and B of the tire 7 is L=L1-L2;

[0053] S5. Calculate the d of steel pipe 8 凹陷深度 :Use the Pythagorean theorem to calculate h, h= ;

[0054] d 凹陷深度 =Rh;

[0055] h is the height from the contact point A to the axial center of the steel pipe 8, and d is the height from the contact point A to the lowest point of the steel pipe 8.

[0056] Calculate the height S of the centerline of the steel pipe 8 from the ground 14, S = H 转胎高度 + Rd 凹陷深度 The height S is input into the computer to drive the servo motor 16 to rotate the servo motor 16 so that the probe arm 3 is lifted to a position at a height S of the ground 14, and the probe arm adjustment is completed.

[0057] Example 3

[0058] Further illustrate with reference to Examples 1 and 2, Figures 1 to 7, taking Φ820x10 steel pipe as an example, R is 410mm, drive the trolley 9 to make the probe arm 3 extend into the steel pipe 8, open the rolling track of the trolley 9, and drop the steel pipe 8 onto the tire 7. There are two contact points A and B between the steel pipe 8 and the tire 7; measure the height of the contact point between the tire wheel 701 and the steel pipe 8, drive the first motor 508, so that the horizontal laser line 17 emitted from the first laser emitter 506 covers point A or B, and read the value on the vertical scale 507 as H 转胎高度 , H 转胎高度 It is 500mm.

[0059] Roughly adjust the position of the second laser emitter 611: drive the second motor 610 to make the second laser emitter 611 roughly located at the lower side of point A, turn on the drive motor 607 to make the longitudinal laser line 18 emitted by the second laser emitter 611 intersect with the transverse laser line 17; measure the distance between the two contact points A and B of the steel pipe 8 and the tire 7: drive the second motor 610 to make the longitudinal laser line 18 cover point A, record the value L1 on the transverse scale 609, drive the second motor 610 again to make the longitudinal laser line 18 cover point B, record the value L2 on the transverse scale 609, the distance L between the contact points A and B of the tire 7 = L1-L2, and L is calculated to be 400mm.

[0060] Calculate the d of steel pipe 8 凹陷深度 :Use the Pythagorean theorem to calculate h, h= , and h is 358 mm

[0061] d 凹陷深度 =Rh, find d 凹陷深度 It is 52mm.

[0062] h is the height from the contact point A to the axial center of the steel pipe 8, and d is the height from the contact point A to the lowest point of the steel pipe 8.

[0063] Calculate the height S of the centerline of the steel pipe 8 from the ground 14, S = H 转胎高度 + Rd 凹陷深度 , S is obtained as 838mm, the height 838mm is input into the computer, and the servo motor 16 is driven to rotate the servo motor 16 to lift the probe arm 3 to a position at a height S of the ground 14, and the probe arm adjustment is completed.

[0064] A1: Calculate A1 circumferential weld joint K= = ≦1.1 (Grade A); k≦1.06 (Grade B)

[0065] In the central transillumination method, K=1 transverse crack detection angle θ≈0° Ug≦( ) (Level A)

[0066] A2: When the adjustment probe arm is not in the center, θ=

[0067] Θ is the maximum distortion angle.

[0068] That is, the position of the probe arm at a distance of 838mm from the horizontal height is the probe arm height for the 820 specification steel pipe to reach the focal length of the center transillumination method. At this time, k=1. Previously, it was enough for the A-level k value to reach 1.1 in terms of process. Now the k value has been increased by 10 / 100, which improves the detection sensitivity. By calculating the S value of steel pipes of different specifications at one time and marking them, you only need to press the probe arm lifting power to align with the mark to adjust any specification of the probe arm.

[0069] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A method for accurately adjusting a probe arm device of a fixed X-ray machine, characterized by: S1. Preparation before measurement: determine the specifications of the steel pipe (8), measure the height of the probe arm (3) from the ground (14), the radius R of the steel pipe (8), return the slide seat (504) on the height measuring device (5) to zero, return the sliding sleeve (604) of the distance measuring device (6) to zero, drive the trolley (9) so that the probe arm (3) extends into the steel pipe (8), open the rolling track of the trolley (9), and drop the steel pipe (8) onto the rotating tire (7). There are two contact points A and B between the steel pipe (8) and the rotating tire (7); S2. Measure the height of the contact point between the tire rotating wheel (701) and the steel pipe (8), drive the first motor (508) so that the transverse laser line (17) emitted by the first laser emitter (506) covers point A or B, and read the value on the vertical scale (507) as H. 转胎高度 ; S3, roughly adjusting the position of the second laser emitter (611): driving the second motor (610) so that the second laser emitter (611) is roughly located below point A, and turning on the drive motor (607) so that the longitudinal laser line (18) emitted by the second laser emitter (611) intersects with the transverse laser line (17); S4, measuring the distance between the two contact points A and B between the steel pipe (8) and the tire (7): driving the second motor (610) so that the longitudinal laser line (18) covers point A, recording the value L1 on the transverse scale (609), driving the second motor (610) again so that the longitudinal laser line (18) covers point B, recording the value L2 on the transverse scale (609), and the distance L between the contact points A and B of the tire (7) = L1-L2; S5. Calculate the d of the steel pipe (8) 凹陷深度 :Use the Pythagorean theorem to calculate h, h= ; d 凹陷深度 =R-h; h is the height from the contact point A to the axis of the steel pipe (8), d is the height from the contact point A to the lowest point of the steel pipe (8), S6. Calculate the height S of the centerline of the steel pipe (8) from the ground (14), S = H 转胎高度 + Rd 凹陷深度 ; S7, input the height S into the computer, drive the servo motor (16), so that the servo motor (16) rotates, so that the probe arm (3) is lifted to a position at a height S of the ground (14), and the probe arm adjustment is completed; The method uses a fixed X-ray machine precision probe arm adjustment device, the fixed X-ray machine precision probe arm adjustment device comprising a machine base (1), the machine base (1) being provided with a sliding probe arm (3), the probe arm (3) extending into the interior of a steel pipe (8), the steel pipe (8) resting against a rotating tire (7), a measuring device (4) being provided on one side of the machine base (1), the measuring device (4) comprising a height measuring device (5) and a distance measuring device (6), the height measuring device (5) being provided with a vertically sliding first laser emitter (506), the distance measuring device (6) being provided with a horizontally sliding sleeve (604), and the sleeve (604) being provided with a rotatable second laser emitter (611); The steel pipe (8) and the tire (7) have two contact points. The height measuring device (5) is used to measure the height of the contact point between the steel pipe (8) and the tire (7) from the ground (14). The distance measuring device (6) is used to measure the distance between the two contact points between the steel pipe (8) and the tire (7).

2. According to claim 1, a method for accurately adjusting the detector arm device of a fixed X-ray machine is characterized by: A slide rail (101) is provided on the machine base (1), the probe arm (3) is mounted on the lifting slider (2), a plurality of pulleys (201) are provided on the lifting slider (2), and the pulleys (201) abut against the slide rail (101).

3. According to claim 1, the method for accurately adjusting the detector arm device of a fixed X-ray machine is characterized by: A servo motor (16) is installed on the top of the machine base (1). A main screw rod (15) is provided at one end of the servo motor (16). The main screw rod (15) is threadedly connected to a screw rod seat on the lifting slide block (2).

4. According to claim 1, the method for accurately adjusting the detector arm device of a fixed X-ray machine is characterized by: A trolley (9) is installed at the bottom of the steel pipe (8), a plurality of rotating tires (7) are arranged on the trolley (9), two rotating tire wheels (701) are arranged on the rotating tire (7), and the steel pipe (8) abuts against the two rotating tire wheels (701).

5. The method for accurately adjusting the detector arm device of a fixed X-ray machine according to claim 1, characterized in that: An X-ray generator (13) is provided at one end of the probe arm (3), a fixing frame (19) is provided at one side of the probe arm (3), a fixing bracket (11) is provided at the top of the fixing bracket (19), a DR receiver (12) is provided on the fixing bracket (11), and the DR receiver (12) is located directly above the X-ray generator (13).

6. The method for accurately adjusting the detector arm device of a fixed X-ray machine according to claim 1, characterized in that: The height measuring device (5) is vertically mounted on the ground (14), and comprises a base (501), a guide column (502) and a first screw rod (503) are provided on the base (501), a slide seat (504) is provided on the first screw rod (503), a first laser emitter (506) is provided on the slide seat (504), a threaded hole (505) is provided on the slide seat (504), the threaded hole (505) is threadedly connected to the first screw rod (503), the guide column (502) abuts against the slide hole of the slide seat (504), a vertical scale (507) is provided on the guide column (502), and a first motor (508) is provided on the base (501).

7. The method for accurately adjusting the detector arm device of a fixed X-ray machine according to claim 1, characterized in that: The distance measuring device (6) is horizontally arranged on the ground (14), and comprises two fixed blocks (601), a guide column (602) and a second screw rod (603) are arranged between the fixed blocks (601), the second screw rod (603) is threadedly connected to a threaded through hole on a sliding sleeve (604), a second motor (610) is arranged on one of the fixed blocks (601), an output end of the second motor (610) is connected to the second screw rod (603), and a horizontal scale (609) is arranged on the guide column (602).

8. The method for accurately adjusting the detector arm device of a fixed X-ray machine according to claim 1, characterized in that: An annular sliding groove is provided on the sliding sleeve (604), a rotating sleeve (605) is provided on the sliding sleeve (604), one end of the rotating sleeve (605) is against the annular sliding groove, the other end of the rotating sleeve (605) is provided with an inner gear ring (606), one end of the sliding sleeve (604) is provided with a driving motor (607), an output shaft of the driving motor (607) is provided with a gear (608), the gear (608) is meshed with the inner gear ring (606), and a second laser emitter (611) is provided on the rotating sleeve (605).

9. The method for accurately adjusting the detector arm device of a fixed X-ray machine according to claim 1, characterized in that: The height measuring device (5) generates a transverse laser line (17), and the distance measuring device (6) generates a longitudinal laser line (18).

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