Longitudinal defect depth measuring instrument for petroleum product pipe

Abstract

The invention relates to the technical field of defect depth measurement, and discloses a petroleum product pipe longitudinal defect depth measuring instrument which comprises a laser intelligent sensor measuring module, a centering arm, a first jaw arranged at the top of one end of the centering arm, and a second jaw arranged in the middle of the top of the first jaw. The upper centering adjusting arm is arranged at the bottom of one end, far away from the jaw, of the jaw II; the radius measuring arm is arranged at the top of one end, far away from the jaw, of the jaw II; the measuring scale is arranged at the top of the auxiliary measuring arm; the moving hole is formed in the middle of the centering arm; the groove is formed in the auxiliary measuring arm; and the laser intelligent sensor measuring module is used for measuring the incidence point and the leading edge length. Through non-contact measurement, automatic calculation and millimeter-level precision control of the laser intelligent sensor, the problems of subjective errors, low efficiency and the like of a traditional method are solved, and the accuracy of detection data is guaranteed from the source.

Description

Technical Field

[0001] The present invention relates to the technical field of defect depth measurement, and particularly to a longitudinal defect depth measuring instrument for petroleum product pipes. Background Art

[0002] The depth of a defect in a petroleum pipe refers to the degree of damage to the pipe caused by various reasons such as flaws in the manufacturing process, welding problems, and external environmental influences during use inside the petroleum pipe. Usually, the defect depth can be determined by non-destructive testing methods such as magnetic particle testing, penetrant testing, ultrasonic testing, etc. Non-destructive testing mainly determines whether there are problems such as cracks, slag inclusions, and folds inside the pipe by identifying magnetic particles, penetrant traces on the surface of the petroleum pipe, or the reflection of sound waves. According to the different depths of the defects, the defects of petroleum pipes can be divided into three categories: mild, moderate, and severe.

[0003] For longitudinal defects of forged and rolled tubular materials, they are usually measured in the circumferential direction with an inclined probe. At this time, the positioning technology of a transverse wave inclined probe for detecting flat workpieces is not applicable. To adapt to workpieces with a wall thickness and radius value greater than 0.226 or 0.26, the refraction angle of the inclined probe is correspondingly reduced. The probe emits both transverse waves and longitudinal waves. When applying the circumferential detection and positioning formula at this time, it is necessary to judge the wave type (transverse wave or longitudinal wave), which is prone to misjudgment and leads to positioning errors; at the same time, the calculation is also relatively troublesome. Using a depth measuring instrument can directly read the defect depth and refraction angle, quickly and accurately position, and can also determine the generated waveform.

[0004] When measuring the existing defect depth, it is not fast and accurate enough, the adjustment operation is more troublesome, the defect depth and refraction angle cannot be directly read, the accuracy and precision are not high enough, and after the existing device finishes measuring, a large number of complex calculations and conversions are required, the operation process is relatively cumbersome, the measurement efficiency is not high, and the adaptability is not strong enough. Summary of the Invention

[0005] In view of the problems in the prior art that the defect depth cannot be directly read visually during measurement, a large number of complex calculations are required, and the accuracy and precision are not high enough, a longitudinal defect depth measuring instrument for petroleum product pipes is thus proposed.

[0006] Its purpose is to: improve the accuracy and precision of measurement, achieve fast and intuitive measurement, simplify the operation process, and improve the measurement efficiency.

[0007] The technical solution of the present invention is a longitudinal defect depth measuring instrument for petroleum product pipes, comprising a laser intelligent sensor measuring module and a centering arm, a jaw 1 arranged at the top of one end of the centering arm, a jaw 2 arranged at the middle position of the top of the jaw 1, an upper centering adjustment arm arranged at the bottom of one end of the jaw 2 away from the jaw, a radius measuring arm arranged at the top of one end of the jaw 2 away from the jaw, a cursor arranged on the radius measuring arm, a lower centering adjustment arm arranged at the bottom of one end of the upper centering adjustment arm near the centering arm, and the upper centering adjustment arm is arranged at the bottom of the centering arm, and one end of the lower centering adjustment arm away from the centering arm is arranged at the bottom of the jaw 1, an auxiliary measuring arm arranged at the top of one end of the jaw 1 away from the centering arm, a measuring ruler arranged at the top of the auxiliary measuring arm, and the measuring ruler is located at the top of the radius measuring arm, a moving hole opened in the middle of the centering arm, through holes respectively arranged in a linear array on the upper centering adjustment arm and the lower centering adjustment arm, and a groove opened on the auxiliary measuring arm;

[0008] The laser intelligent sensor module is used to measure the incident point and the front length;

[0009] It also includes a tightening assembly arranged between the radius measuring arm, the auxiliary measuring arm and the centering arm, and the centering arm, the upper centering adjustment arm and the lower centering adjustment arm are also connected through the tightening assembly;

[0010] The tightening assembly is used to achieve locking of the measuring instrument after measurement.

[0011] Furthermore, the jaws 2, 1 and the centering arm are riveted from top to bottom, one side of the jaws 1 and 2 are arc-shaped, and the jaws of the two jaws can together form a semicircle, and the ends of the two jaws are pointed.

[0012] Furthermore, the radius measuring arm is engraved with scales, and the measuring ruler is composed of a measuring ruler and an angle ruler. The radius measuring arm, jaw 2 and upper centering adjustment arm are connected from top to bottom by a pin provided by the radius measuring arm, and the measuring ruler, auxiliary measuring arm, jaw 1 and lower centering adjustment arm are connected from top to bottom by a pin provided by the measuring ruler.

[0013] Furthermore, the plurality of arms connected to each other are adjusted by gaskets of corresponding thickness so as to be in the same plane for easy rotation adjustment.

[0014] Furthermore, the tightening assembly located at the radius measuring arm includes a tightening bolt that penetrates the radius measuring arm, the auxiliary measuring arm and the centering arm from top to bottom in sequence, and the tightening bolt is slidably connected in the movable hole, a tightening nut is arranged at the bottom of the tightening bolt, a tightening spring is arranged at the top of the tightening nut, and an extrusion circular plate is arranged at the top of the tightening spring, and the top of the extrusion circular plate abuts against the bottom of the centering arm.

[0015] Further, an adjusting component is also arranged inside the fastening component. The adjusting component includes a knob arranged at the top of the fastening bolt, a rotating shaft arranged at the bottom of the knob, and the rotating shaft is rotationally limited inside the fastening bolt. Rotating holes symmetrically opened on both sides of the bottom of the fastening bolt and communicating with its interior, adjusting plates symmetrically arranged on both sides of the bottom of the rotating shaft and passing through the rotating holes, and adjusting grooves annularly arrayed on the top of the pressing circular plate.

[0016] Further, the inside of the adjusting groove is in an arc-shaped slope, and the bottom of the adjusting plate abuts against the inclined surface of the adjusting groove.

[0017] Further, rubber strips are symmetrically arranged on both sides of the pressing circular plate that do not coincide with the two adjusting grooves, and the middle of the rubber strip is in a V shape.

[0018] Further, the fastening bolt includes a threaded groove opened at the bottom of the fastening bolt, a smooth surface arranged at the bottom of the threaded groove, and the threaded groove is located at the bottom of the pressing circular plate.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Through the non-contact measurement, automatic calculation and millimeter-level precision control of the laser intelligent sensor, the measurement of the incident point and the front edge has changed from "experience-driven" to "data-driven", which not only solves the problems of subjective error and low efficiency of traditional methods, but also guarantees the accuracy of the detection data from the source, especially suitable for industrial non-destructive testing scenarios with strict precision requirements.

[0021] 2. The structural design of the movable center of the circle enables the measuring instrument to directly read the defect depth and the refraction angle, making the measurement have higher precision and accuracy, and not being affected by the viewing angle and light conditions. Therefore, it can provide more accurate depth and angle information; and the measurement is convenient and fast, and the direct reading can avoid complex calculations and conversions, greatly simplifying the operation process and improving the work efficiency; and it can achieve fast and accurate positioning, as well as quickly determine the waveform.

[0022] 3. It realizes the extrusion and fixation of the centering arm through the fastening spring, which is different from the direct hard extrusion and fixation of the existing bolts and nuts. When adjusting next time, it is not necessary to first use tools to loosen the bolts and then adjust, and then tighten them after adjustment. The cumbersome operation can be directly moved during adjustment by rotating the adjusting component, and due to the extrusion of the fastening spring, there will no longer be a large movement during adjustment, which is likely to cause too much or too little adjustment distance. It can achieve fast and precise adjustment, and the adjustment is convenient and fast.

[0023] 4. By means of the provided adjusting component, the rotation amplitude of the knob can be controlled to control the rotation amplitude of the adjusting plate in the adjusting groove, thereby realizing the pressing degree of the adjusting plate on the pressing circular plate. In this way, under the extrusion of the compression spring, the pressing circular plate can continuously and frictionally extrude the bottom of the centering arm, avoiding the situation where the traditional nut directly disengages from the bolt after being loosened, resulting in unstable adjustment movement, improving the stability and accuracy during adjustment, and further enhancing the measurement and adjustment efficiency. Brief Description of the Drawings

[0024] Figure 1 It is a three-dimensional structure schematic diagram of the whole of the present invention;

[0025] Figure 2 It is a top view structure schematic diagram of the whole of the present invention;

[0026] Figure 3 It is a bottom three-dimensional structure schematic diagram of the whole of the present invention;

[0027] Figure 4 It is a whole structure schematic diagram when the locking component of the present invention is locked;

[0028] Figure 5 It is a three-dimensional structure schematic diagram of the overall cooperation of the locking component and the adjusting component of the present invention;

[0029] Figure 6 It is an exploded whole structure schematic diagram of the locking component and the adjusting component of the present invention;

[0030] Figure 7 It is a partial cross-sectional structure schematic diagram of the locking bolt of the present invention.

[0031] In the figure:

[0032] 1, centering arm; 2, jaw one; 3, jaw two; 4, upper centering adjusting arm; 5, radius measuring arm; 6, cursor; 7, lower centering adjusting arm; 8, auxiliary measuring arm; 9, measuring scale; 10, moving hole; 11, through hole; 12, groove; 13, gasket; 14, locking bolt; 15, locking nut; 16, locking spring; 17, pressing circular plate; 18, knob; 19, rotating shaft; 20, rotating hole; 21, adjusting plate; 22, adjusting groove; 23, rubber strip; 24, thread groove; 25, smooth surface. Detailed Embodiments

[0033] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings of the specification.

[0034] Example 1, refer to Figures 1-3, which is the first embodiment of the present invention, provides an instrument for measuring the longitudinal defect depth of oil product pipes. The overall length of the instrument is 460 millimeters and it includes a laser intelligent sensor measurement module and a centering arm 1 installed on the instrument, a jaw 1 rotatably connected to the top of one end of the centering arm 1, a jaw 2 rotatably connected to the middle position at the top of the jaw 1, an upper centering adjustment arm 4 rotatably connected to the bottom of the end of the jaw 2 away from the jaw 1, a radius measurement arm 5 rotatably connected to the top of the end of the jaw 2 away from the jaw 1, a cursor 6 slidably connected to the radius measurement arm 5, a lower centering adjustment arm 7 rotatably connected to the bottom of the end of the upper centering adjustment arm 4 close to the centering arm 1, and the upper centering adjustment arm 4 is arranged at the bottom of the centering arm 1. One end of the lower centering adjustment arm 7 away from the centering arm 1 is movably connected to the bottom of the jaw 1, an auxiliary measurement arm 8 rotatably connected to the top of the end of the jaw 1 away from the centering arm 1, a measuring scale 9 rotatably connected to the top of the auxiliary measurement arm 8, and the measuring scale 9 is located at the top of the radius measurement arm 5, a moving hole 10 opened in the middle of the centering arm 1, through holes 11 respectively linearly arrayed on the upper centering adjustment arm 4 and the lower centering adjustment arm 7, and a groove 12 opened on the auxiliary measurement arm 8; the laser intelligent sensor module is used to measure the incident point and the front length. It integrates an intelligent chip, which can independently control the emission and reception of signals and automatically calculate the signals, so as to calculate the incident point coordinates and the front length; it also includes a fastening component installed between the radius measurement arm 5, the auxiliary measurement arm 8 and the centering arm 1, and the centering arm 1, the upper centering adjustment arm 4 and the lower centering adjustment arm 7 are also connected through the fastening component; the fastening component is used to lock the instrument after measurement.

[0035] Specifically, the defect positioning when detecting a cylindrical workpiece with transverse waves can be determined by the defect arc length (or chord length) and depth. During specific measurement, the transverse wave first wave of the same defect and the same sound path (reaching the reference wave height) are positioned from two opposite directions on the same circumference. The position of the front edge or incident point on the workpiece is calibrated. The midpoint of the distance between the two front edges is the radial position of the defect on the circumference, and the distance between the incident point and the midpoint is the arc length (or chord length) of the defect; by measuring the intersection point of the sound path (displayed on the flaw detector) and the radius, the depth of the defect can be read out, and thus the defect position is determined.

[0036] During specific measurement, first measure the probe incident point. When the slope wedge radian of the inclined probe has been ground, the laser displacement sensor in the laser intelligent sensor measurement module can emit a vertical laser beam to capture the distance between the probe and the edge of the test block in real time, automatically calculate the incident point coordinates (accuracy ±0.02 mm), replace manual visual judgment, and eliminate subjective errors. When the slope wedge has not been ground, use a line laser scanner to construct a three-dimensional model of the probe end face, fit the incident point and the leading edge length (accuracy ±0.05 mm) in combination with the echo signal, and project a reference line through a laser alignment instrument to assist in grinding to ensure the accurate positioning of the incident point along the sound beam direction. The traditional method relies on manual observation of the echo peak value, scale alignment or manual scribing, and is easily affected by visual judgment and operation techniques (such as finding the strongest echo by experience in the edge reflection method, with an error of up to ±0.5 mm). Through the non-contact measurement, automatic calculation and millimeter-level precision control of the laser intelligent sensor, the measurement of the incident point and the leading edge has changed from "experience-driven" to "data-driven", not only solving the problems of subjective errors and low efficiency of the traditional method, but also guaranteeing the accuracy of the detection data from the source, especially suitable for industrial non-destructive testing scenarios with strict precision requirements. Secondly, measure the arc length (chord length). Align the first jaw 2 and the second jaw 3 with the incident point and the center point respectively, and lock the locking component between the D points, then the arc length (chord length) can be measured. Subsequently, perform the center positioning. After the first jaw 2 and the second jaw 3 are locked, adjust the horizontal line on the end face of the E point knob 18 to coincide with the corresponding radius value scale line of the radius measuring arm 5, and lock the locking component of E. At this time, the center and the radius are determined. Finally, the scale of the measuring ruler 9 starts from point C, and the scale of the radius measuring arm 5 starts from point B. The intersection point of the sound path scale point of the measuring ruler 9 and the midline edge of the vernier 6 is the sound path; the intersection line of the edge of the vernier 6 and the radius measuring arm 5 is the defect depth; the intersection point of the measuring ruler 9 and the left edge of the groove 12 of the auxiliary measuring arm 8 can be used to read the incident angle to judge the waveform (transverse wave or longitudinal wave). When the waveform is correct, the intersection point must be within the wall thickness range for depth measurement.

[0037] If the radius of the workpiece ≤ 140 mm, satisfactory results can also be obtained when the measured refraction angle reaches about 17°. When the radius of the workpiece ≥ 140 mm, the radius is R1; within the measurement range, the radius is R2. Let Adjust the jaw length to times, and for a certain determined value of the arc length (chord length), the radius measuring arm 5 and the measuring ruler 9 are expanded to K times of the original in the same proportion, so that large workpieces can be positioned. When the radial expansion range of the defect is required, it can be roughly measured through the measurement of the endpoints, or roughly obtained through the defect equivalent on the distance-amplitude curve.

[0038] The structural design of the movable center of the circle enables the measuring instrument to directly read the defect depth and refraction angle, making the measurement more precise and accurate, and will not be affected by viewing angle and light conditions, so it can provide more accurate depth and angle information; and the measurement is convenient and fast, and can be directly read to avoid complex calculations and conversions, greatly simplifying the operation process and improving work efficiency; and it can achieve fast and accurate positioning, as well as rapid determination of the waveform.

[0039] Reference Figures 1-3 The jaws 2 3, the jaws 1 2 and the centering arm 1 are riveted from top to bottom, one side of the jaws 1 2 and the jaws 2 3 are both arc-shaped, and the jaws of the two can together form a semicircle, and the ends of the two are both pointed.

[0040] Specifically, the arc-shaped jaw 1 2 and jaw 2 3 can expand the measuring range and facilitate clamping, and the pointed end is set to facilitate accurate clamping of defects.

[0041] Reference Figures 1-3 The radius measuring arm 5 is engraved with scales, and the measuring ruler 9 is composed of a measuring ruler and an angle ruler. The radius measuring arm 5, the second jaw 3 and the upper centering adjustment arm 4 are connected from top to bottom by a pin provided by the radius measuring arm 5, and the measuring ruler 9, the auxiliary measuring arm 8, the first jaw 2 and the lower centering adjustment arm 7 are connected from top to bottom by a pin provided by the measuring ruler 9.

[0042] Specifically, during measurement, data can be directly read out through the scales and angles on the radius measuring arm 5 and the measuring ruler 9, which is convenient and quick, and improves the accuracy and efficiency of measurement.

[0043] Reference Figure 1 and 3 The interconnected arms are adjusted by gaskets 13 of corresponding thickness so that they are in the same plane for easy rotation adjustment.

[0044] Specifically, the gasket 13 enables the joints of the different arms connected to each other to be in the same plane, which is convenient for rotation during measurement.

[0045] Example 2, reference Figures 1-5 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the fastening assembly located at the radius measuring arm 5 includes a fastening bolt 14 that penetrates the radius measuring arm 5, the auxiliary measuring arm 8 and the centering arm 1 from top to bottom in sequence, and the fastening bolt 14 is slidably connected in the moving hole 10, a fastening nut 15 threadedly connected to the bottom of the fastening bolt 14, a fastening spring 16 abutting against the top of the fastening nut 15, and an extrusion circular plate 17 abutting against the top of the fastening spring 16, and the top of the extrusion circular plate 17 abuts against the bottom of the centering arm 1.

[0046] Specifically, during adjustment, it is necessary to adjust the positions at points D and E. At this time, the set screw nut 15 can be tightened first, so that the set screw nut 15 squeezes the set screw spring 16. The set screw spring 16 presses the pressing circular plate 17 upward. The pressing circular plate 17 is squeezed by the set screw spring 16 and thus squeezes the bottom of the centering arm 1. It realizes the squeezing and fixing of the centering arm 1 through the set screw spring 16, which is different from the existing direct hard squeezing and fixing of bolts and nuts. This makes it unnecessary to first use tools to loosen the bolts and then adjust during the next adjustment, and then tighten them after adjustment. The adjustment can be directly moved by rotating the adjustment component during adjustment. And due to the squeezing effect of the set screw spring 16, there will no longer be large-scale movement during adjustment, which is likely to cause too much or too little adjustment distance. It can achieve fast and accurate adjustment, and the adjustment is convenient and fast. The remaining structure is the same as that of Embodiment 1.

[0047] Embodiment 3, referring to Figures 1-7 , which is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that: an adjustment component is further installed inside the set screw component. The adjustment component includes a knob 18 rotatably connected to the top of the set screw bolt 14, a rotating shaft 19 fixedly connected to the bottom of the knob 18, and the rotating shaft 19 is rotationally limited inside the set screw bolt 14. Rotating holes 20 symmetrically opened on both sides of the bottom of the set screw bolt 14 and communicating with its interior, adjustment plates 21 symmetrically fixedly connected to both sides of the bottom of the rotating shaft 19 and passing through the rotating holes 20, and adjustment grooves 22 annularly arranged on the top of the pressing circular plate 17.

[0048] Specifically, during adjustment, by grasping the computer knob 18, the knob 18 drives the rotating shaft 19 and the adjustment plates 21 on both sides to rotate in the rotating holes 20. The bottom of the adjustment plate 21 rotates in the adjustment grooves 22, so that the pressing circular plate 17 is squeezed and moves downward, that is, it disengages from the squeezing of the bottom of the centering arm 1, and the adjustment of the tightening bolt can be realized; and the rotation amplitude of the knob 18 can be controlled to control the rotation amplitude of the adjustment plate 21 in the adjustment grooves 22, so as to realize the downward pressing degree of the adjustment plate 21 on the pressing circular plate 17. In this way, under the squeezing action of the set screw spring 16, the pressing circular plate 17 can realize continuous frictional squeezing on the bottom of the centering arm 1 through the pressing circular plate 17, avoiding the situation that the traditional nut directly disengages from the contact with the bolt after being loosened, resulting in unstable adjustment movement, and improving the stability and accuracy during adjustment, thereby improving the measurement and adjustment efficiency.

[0049] Referring to Figure 5 and Figure 7 , the interior of the adjustment groove 22 is in an arc-shaped slope, and the bottom of the adjustment plate 21 abuts against the inclined surface of the adjustment groove 22.

[0050] Specifically, when the adjusting plate 21 rotates, the ramp in the adjusting groove 22 is squeezed, causing the squeezing circular plate 17 to move downward, thereby realizing the control of the squeezing degree of the squeezing circular plate 17.

[0051] Refer to Figure 7 , on both sides of the squeezing circular plate 17 that do not coincide with the two adjusting grooves 22, rubber strips 23 are symmetrically and fixedly connected, and the middle of the rubber strip 23 is in a V shape.

[0052] Specifically, the setting of the V-shaped rubber strip 23 in the middle can improve the squeezing and fixing degree of the squeezing circular plate 17 on the centering arm 1 after tightening, and can also increase the friction between the squeezing circular plate 17 and the bottom of the centering arm 1 during the adjustment movement, avoiding excessive or too small adjustment amplitude.

[0053] Refer to Figure 6 , the set screw 14 includes a threaded groove 24 opened at the bottom of the set screw 14, and a smooth surface 25 provided at the bottom of the threaded groove 24, and the threaded groove 24 is located at the bottom of the squeezing circular plate 17.

[0054] Specifically, since the thickness of the centering arm 1 is fixed, when the lock nut 15 moves in the threaded groove 24 at the bottom, the centering arm 1 can be squeezed and fixed by squeezing the tightening spring and the squeezing circular plate 17. And when the knob 18 rotates, the adjusting plates 21 on both sides at the bottom can just rotate in the moving holes 10. The rest of the structure is the same as that of Embodiment 2.

[0055] Combining Embodiments 1-3, the working principle of the present invention: During measurement, the first jaw 2 and the second jaw 3 are respectively aligned with the incident point and the center point, and then the set screw 14 between the upper centering adjustment arm 4 and the lower centering adjustment arm 7 is locked to measure the arc length. Then, by adjusting the horizontal line on the end face of the knob 18 to coincide with the corresponding radius value scale line of the radius measurement arm 5 and locking the tightening assembly, the center of the circle is determined. Finally, the measuring ruler 9 and the radius measurement arm 5 are adjusted to read the sound path, defect depth, and incident angle, and the waveform is judged; and during the measurement adjustment, the knob 18 is turned to make the adjusting plate 21 squeeze the adjusting groove 22, so that the squeezing circular plate 17 squeezes the tightening spring 16 to realize the movement during adjustment, and the friction during the adjustment movement is controlled by controlling the rotation amplitude of the knob 18.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An instrument for measuring the depth of longitudinal defects of oil product pipes, characterized in that: The invention comprises a laser intelligent sensor measurement module and a centering arm (1), a jaw (2) arranged at the top of one end of the centering arm (1), a jaw (3) arranged at the middle position of the top of the jaw (2), an upper centering adjustment arm (4) arranged at the bottom of the end of the jaw (3) away from the jaw (2), a radius measuring arm (5) arranged at the top of the end of the jaw (3) away from the jaw (2), a cursor (6) arranged on the radius measuring arm (5), a lower centering adjustment arm (7) arranged at the bottom of one end of the upper centering adjustment arm (4) close to the centering arm (1), and the upper centering adjustment arm (4) is arranged at The bottom of the centering arm (1), one end of the lower centering adjustment arm (7) away from the centering arm (1) is arranged at the bottom of the jaw (2), an auxiliary measuring arm (8) is arranged at the top of the jaw (2) away from the centering arm (1), a measuring ruler (9) is arranged at the top of the auxiliary measuring arm (8), and the measuring ruler (9) is located at the top of the radius measuring arm (5), a movable hole (10) is opened in the middle of the centering arm (1), through holes (11) are respectively opened in a linear array on the upper centering adjustment arm (4) and the lower centering adjustment arm (7), and a groove (12) is opened on the auxiliary measuring arm (8); The laser intelligent sensor measurement module is used to measure the incident point and the front length; It also includes a tightening assembly arranged between the radius measuring arm (5), the auxiliary measuring arm (8) and the centering arm (1), and the centering arm (1), the upper centering adjustment arm (4) and the lower centering adjustment arm (7) are also connected via the tightening assembly; the tightening assembly is used to achieve locking of the measuring instrument after measurement.

2. The longitudinal defect depth measuring instrument for petroleum product pipes according to claim 1, wherein: The jaws 2 (3), 1 (2) and the centering arm (1) are riveted from top to bottom, one side of the jaws 1 (2) and 2 (3) are both arc-shaped, and the jaws of the two jaws can together form a semicircle, and the ends of the two jaws are both pointed.

3. The longitudinal defect depth measuring instrument for petroleum product pipes according to claim 1, wherein: The radius measuring arm (5) is engraved with scales, and the measuring ruler (9) is composed of a measuring ruler and an angle ruler. The radius measuring arm (5), the second jaw (3) and the upper centering adjustment arm (4) are connected from top to bottom by a pin shaft provided by the radius measuring arm (5), and the measuring ruler (9), the auxiliary measuring arm (8), the first jaw (2) and the lower centering adjustment arm (7) are connected from top to bottom by a pin shaft provided by the measuring ruler (9).

4. The longitudinal defect depth measuring instrument for petroleum product pipes according to claim 1, wherein: The plurality of arms connected to each other are adjusted via gaskets (13) of corresponding thickness so that they are in the same plane, which facilitates rotation adjustment.

5. The longitudinal defect depth measuring instrument for petroleum product pipes according to claim 1, characterized in that: The tightening assembly located at the radius measuring arm (5) comprises a tightening bolt (14) which penetrates the radius measuring arm (5), the auxiliary measuring arm (8) and the centering arm (1) in sequence from top to bottom, and the tightening bolt (14) is slidably connected in the moving hole (10), a tightening nut (15) arranged at the bottom of the tightening bolt (14), a tightening spring (16) arranged at the top of the tightening nut (15), and an extrusion circular plate (17) arranged at the top of the tightening spring (16), and the top of the extrusion circular plate (17) abuts against the bottom of the centering arm (1).

6. The longitudinal defect depth measuring instrument for petroleum product pipes according to claim 5, wherein: An adjusting component is further arranged inside the fastening component. The adjusting component includes a knob (18) arranged at the top of the fastening bolt (14), a rotating shaft (19) arranged at the bottom of the knob (18), and the rotating shaft (19) is limited to rotate inside the fastening bolt (14). Rotating holes (20) are symmetrically opened on both sides of the bottom of the fastening bolt (14) and communicated with its interior. Adjusting plates (21) are symmetrically arranged on both sides of the bottom of the rotating shaft (19) and penetrate through the rotating holes (20), and adjusting grooves (22) are annularly and arrayedly opened on the top of the pressing circular plate (17).

7. The longitudinal defect depth measuring instrument for petroleum product pipes according to claim 6, characterized in that: The interior of the adjusting groove (22) is in an arc-shaped slope, and the bottom of the adjusting plate (21) abuts against the inclined surface of the adjusting groove (22).

8. The longitudinal defect depth measuring instrument for petroleum product pipes according to claim 6, characterized in that: Rubber strips (23) are symmetrically arranged on both sides of the pressing circular plate (17) that do not coincide with the two adjusting grooves (22), and the middle of the rubber strip (23) is in a V shape.

9. The longitudinal defect depth measuring instrument for petroleum product pipes according to claim 5, characterized in that: The fastening bolt (14) includes a threaded groove (24) opened at the bottom of the fastening bolt (14), a smooth surface (25) arranged at the bottom of the threaded groove (24), and the threaded groove (24) is located at the bottom of the pressing circular plate (17).

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