Calibration method and calibration device for measuring thickness of pipe wall of pipe

Abstract

The invention relates to the technical field of pipe wall thickness measurement, and discloses a calibration method and calibration device for pipe wall thickness measurement, and the calibration device comprises a support frame, one end of the support frame is fixedly connected with a semicircular frame, and the exterior of the semicircular frame is slidably connected with a moving shell. A first motor drives a positive and negative screw rod to rotate, the positive and negative screw rod drives a connecting plate and a fixing shell to move towards a pipe, so that a first roller on a connecting shell is in contact with the surface of the pipe, but the first motor still rotates, and the connecting shell pushes a rack to drive a third gear to rotate; the first small gear and the second small gear are driven by kinetic energy transmission to respectively drive the corresponding first rotating arm and the second rotating arm to move, and then the second roller is pushed to move towards the pipe until the second roller is in contact with the surface of the pipe, so that the device can be suitable for pipes of different sizes, the measuring efficiency is improved, and the measuring precision is improved. And the stable operation of the measurement process is ensured, so that the practicability of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe wall thickness measurement, and in particular to a pipe wall thickness measurement calibration method and a calibration device. Background Art

[0002] Overhead pipelines are engineering facilities that use ground or water support structures as carriers to transport fluid media through a spanning system. They consist of three parts: a spanning structure, a supporting structure, and a foundation. These spanning structures are primarily categorized as pipeline spans and bridge spans. The former utilizes straight, arched, or suspended pipes to form a continuous beam system, suitable for small and medium-span applications. The latter relies on steel or concrete bridges to support the pipeline, facilitating later maintenance and replacement. These pipelines are widely used to transport media such as gas and heat, preventing groundwater erosion and underground space conflicts, and reducing the risk of gas accumulation through air diffusion.

[0003] Existing pipe wall thickness measurement devices mostly adopt a fixed structure design, which is difficult to adapt to the sizes of overhead pipelines of different specifications. This not only leads to a significant decrease in measurement efficiency, but also affects the continuity of the measurement process, ultimately reducing the practicality of the device. Summary of the Invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0005] The technical solution of the present invention is achieved as follows: a calibration method and calibration device for measuring the thickness of a pipe wall, comprising a support frame, one end of the support frame is fixedly connected to a semicircular frame, the semicircular frame is slidably connected to a movable shell on the outside, one end of the movable shell is fixedly connected to a fixed block, the fixed block is fixedly connected to an electric telescopic rod inside, the bottom of the electric telescopic rod is fixedly connected to an electromagnetic ultrasonic thickness gauge, the support frame is slidably connected to a connecting plate inside, a movable mechanism for adapting to pipes of different sizes is provided on the connecting plate, the bottom of the connecting plate is fixedly connected to a fixed shell, and one side of the fixed shell is fixedly connected to a fixed The gear train is connected to the gear of the said sliding member by the said fixed member, and the gear train is connected to the gear of the said sliding member by the said fixing member, and the gear train is connected to the gear of the said sliding member by the said fixing member.

[0006] As a preferred solution of the calibration method and calibration device for measuring the wall thickness of a pipe described in the present invention, wherein: a second motor is fixedly connected to the top of the connecting shell, a first rotating rod is rotatably connected inside the connecting shell, a first gear is fixedly connected to the outside of the first rotating rod, the first gear is meshed with a synchronous belt, a second gear is fixedly connected to the outside of the second rotating rod, the second motor is fixedly connected to the first rotating rod, and the second gear is meshed with the synchronous belt.

[0007] As a preferred solution of the calibration method and calibration device for measuring the wall thickness of a pipe described in the present invention, a first slider is fixedly connected to the top of the rack, the first slider is slidably connected to the fixed shell, and the first slider is "T"-shaped.

[0008] As a preferred solution of the calibration method and calibration device for measuring the wall thickness of a pipe described in the present invention, wherein: one end of the third rotating rod is fixedly connected to a third gear, the outside of the third rotating rod is fixedly connected to a first large gear, the inside of the fixed shell is rotatably connected to a fourth rotating rod, the outside of the fourth rotating rod is fixedly connected to a second large gear, the inside of the first rotating arm is fixedly connected to a first small gear, and the inside of the second rotating arm is fixedly connected to a second small gear.

[0009] As a preferred solution of the calibration method and calibration device for measuring the wall thickness of a pipe described in the present invention, wherein: the rack is meshed with the third gear, the first large gear is meshed with the first small gear and the second large gear respectively, and the second large gear is meshed with the second small gear.

[0010] As a preferred solution of the calibration method and calibration device for measuring the wall thickness of a pipe described in the present invention, wherein: a first motor is fixedly connected to one side of the support frame, a forward and reverse screw rod is rotatably connected inside the support frame, the first motor is fixedly connected to the forward and reverse screw rod, and the forward and reverse screw rod is rotatably connected to the connecting plate.

[0011] As a preferred solution of the calibration method and calibration device for measuring the wall thickness of a pipe described in the present invention, wherein: a second slider is fixedly connected to the inner side of the movable shell, a slide groove is provided on the outside of the semicircular frame, a third motor is fixedly connected to one side of the movable shell, a worm is rotatably connected to the inside of the movable shell, a fifth rotating rod and a sixth rotating rod are rotatably connected to the inside of the movable shell, a worm gear is fixedly connected to the outside of the fifth rotating rod, a first bevel gear is fixedly connected to the bottom of the fifth rotating rod, one end of the sixth rotating rod is fixedly connected to the second bevel gear, the other end of the sixth rotating rod is fixedly connected to the fourth gear, and an arc rack is fixedly connected to the inside of the semicircular frame.

[0012] As a preferred solution of the calibration method and calibration device for measuring the pipe wall thickness described in the present invention, the cross section of the second slide groove is "T"-shaped, and the second slider is slidably connected to the slide groove on the semicircular frame.

[0013] As a preferred solution of the calibration method and calibration device for measuring the wall thickness of a pipe described in the present invention, the third motor is fixedly connected to the worm, the worm is meshingly connected to the worm wheel, the first bevel gear is meshingly connected to the second bevel gear, and the fourth gear is meshingly connected to the arc rack.

[0014] As a preferred solution of the calibration method and calibration device for measuring pipe wall thickness described in the present invention, the electromagnetic ultrasonic thickness gauge includes a communication transmission module, a transmission control module, a drive module and an EMAT coil.

[0015] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. The calibration method and calibration device for measuring the wall thickness of a pipe are characterized in that a first motor drives the forward and reverse screws to rotate, and the forward and reverse screws drive the connecting plate and the fixed shell to move toward the pipe, so that the first roller on the connecting shell contacts the surface of the pipe. However, the first motor is still rotating, and the connecting shell pushes the rack to drive the third gear to rotate. After that, the transmission of kinetic energy causes the first pinion and the second pinion to respectively drive the corresponding first rotating arm and the second rotating arm to move, thereby pushing the second roller to move toward the pipe. When the first motor cannot drive the forward and reverse screws to rotate, the second rollers on the first rotating arm and the second rotating arm contact the surface of the pipe. In this way, the device is applicable to pipes of different sizes, thereby improving measurement efficiency, ensuring the stable operation of the measurement process, and thus improving the practicality of the device.

[0016] 2. The calibration method and device for measuring the pipe wall thickness are as follows: when the first rotating arm and the second rotating arm drive the second roller to switch from an extended state to a retracted state, during this process, the second roller contacts the pipe surface and adjusts the position of the device to ensure that the semicircular frame is coaxial with the pipe, thereby achieving the semicircular frame automatically maintaining coaxiality with the pipe under different pipe diameters.

[0017] 3. The calibration method and calibration device for measuring the wall thickness of a pipe are as follows: the worm is driven to rotate by the third motor, and the worm drives the worm wheel to rotate. After that, the kinetic energy transmission causes the sixth rotating rod to drive the fourth gear to rotate, and the fourth gear moves on the arc rack, which causes the movable shell to move on the semicircular frame. The movable shell drives the second slider to slide in the slide groove on the semicircular frame. At the same time, the movable shell also drives the electromagnetic ultrasonic thickness gauge to move. When the movable shell drives the electromagnetic ultrasonic thickness gauge to move to the specified position, the third motor is paused, and the self-locking property of the worm and the worm wheel allows the movable shell to stop at the specified position on the semicircular frame without sliding. In this way, the position of the electromagnetic ultrasonic thickness gauge can be adjusted so that the electromagnetic ultrasonic thickness gauge can measure the wall thickness of different positions of the pipe.

[0018] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them: Figure 1Schematic diagram of the overall structure of the calibration method and calibration device for measuring pipe wall thickness of the present invention; Figure 2 A schematic diagram of the relative positions of the first slider in the calibration method and calibration device for measuring pipe wall thickness of the present invention; Figure 3 A schematic diagram of the relative positions of the fixing rods described in the calibration method and device for measuring the pipe wall thickness of the present invention; Figure 4 Schematic diagram of the spring-related positions of the calibration method and calibration device for measuring pipe wall thickness of the present invention; Figure 5 A schematic diagram of the position of the first gear in the calibration method and device for measuring the pipe wall thickness of the present invention; Figure 6 Schematic diagram of the position of the first large gear in the calibration method and calibration device for measuring the wall thickness of a pipe according to the present invention; Figure 7 Schematic diagram of the relative positions of the forward and reverse screws described in the calibration method and calibration device for measuring the pipe wall thickness of the present invention; Figure 8 Schematic diagram of the relative positions of the movable shell of the calibration method and calibration device for measuring the pipe wall thickness of the present invention; Figure 9 Schematic diagram of the relevant positions of the electromagnetic ultrasonic thickness gauge described in the calibration method and calibration device for measuring the pipe wall thickness of the present invention; Figure 10 A schematic diagram of the position of the worm gear in the calibration method and device for measuring the pipe wall thickness of the present invention; Figure 11 Schematic diagram of the relative positions of the arc-shaped rack described in the calibration method and calibration device for measuring the pipe wall thickness of the present invention.

[0020] Among them, the reference numerals in the figures are: 1. Support frame; 2. First motor; 3. Forward and reverse screw rods; 4. Connecting plate; 5. Moving mechanism; 501. Fixed housing; 502. Fixed rod; 503. Moving rod; 504. Spring; 505. Connecting housing; 506. Second motor; 507. First rotating rod; 508. First gear; 509. Synchronous belt; 510. Second gear; 511. Second rotating rod; 512. First roller; 513. Rack; 514. First slider; 515. Third gear; 516. Third rotating rod; 517. First large gear; 518. First small gear wheel; 519, first rotating arm; 520, second large gear; 521, fourth rotating rod; 522, second small gear; 523, second rotating arm; 524, second roller; 6, moving shell; 7, semicircular frame; 8, second slider; 9, slide; 10, third motor; 11, worm; 12, worm gear; 13, fifth rotating rod; 14, first bevel gear; 15, second bevel gear; 16, sixth rotating rod; 17, fourth gear; 18, arc rack; 19, fixed block; 20, electric telescopic rod; 21, electromagnetic ultrasonic thickness gauge; 22, handle. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used to explain the principles of the present invention together with the embodiments of the present invention.

[0022] like Figures 1 to 11 As shown, the calibration method and calibration device for measuring the wall thickness of a pipe provided in this embodiment include a support frame 1, one end of the support frame 1 is fixedly connected to a semicircular frame 7, the semicircular frame 7 is slidably connected to a movable shell 6 on the outside, one end of the movable shell 6 is fixedly connected to a fixed block 19, the fixed block 19 is fixedly connected to an electric telescopic rod 20 inside, the bottom of the electric telescopic rod 20 is fixedly connected to an electromagnetic ultrasonic thickness gauge 21, the support frame 1 is slidably connected to a connecting plate 4 inside, the connecting plate 4 is provided with a movable mechanism 5 for adapting to pipes of different sizes, the bottom of the connecting plate 4 is fixedly connected to a fixed shell 501, one side of the fixed shell 501 is fixedly connected to a fixed rod 502, and the fixed rod 502 is slidably connected to the movable rod 503 inside. The rod body of the moving rod 503 is provided with a spring 504, and one side of the moving rod 503 is fixedly connected to a connecting shell 505, and the connecting shell 505 is rotatably connected to the second rotating rod 511 inside, and the second rotating rod 511 is fixedly connected to the first roller 512 outside, and the connecting shell 505 is fixedly connected to a rack 513 on one side, and the fixed shell 501 is rotatably connected to the third rotating rod 516 inside, and one end of the third rotating rod 516 is fixedly connected to the third gear 515, and the fixed shell 501 is rotatably connected to the first rotating arm 519 and the second rotating arm 523. One side of the first rotating arm 519 and the second rotating arm 523 is rotatably connected to the second roller 524, and the top of the support frame 1 is fixedly connected to the handle 22.

[0023] Furthermore, a second motor 506 is fixedly connected to the top of the connecting shell 505, a first rotating rod 507 is rotatably connected inside the connecting shell 505, a first gear 508 is fixedly connected to the outside of the first rotating rod 507, the first gear 508 is meshed with the synchronous belt 509, a second gear 510 is fixedly connected to the outside of the second rotating rod 511, the second motor 506 is fixedly connected to the first rotating rod 507, and the second gear 510 is meshed with the synchronous belt 509.

[0024] By adopting the above technical solution, the second motor 506 on the connecting shell 505 drives the first rotating rod 507 to rotate, and the first rotating rod 507 drives the first gear 508 to rotate, and the first gear 508 drives the synchronous belt 509 to rotate, and the synchronous belt 509 drives the second gear 510 to rotate, and the second gear 510 drives the second rotating rod 511 to rotate on the connecting shell 505, and the second rotating rod 511 can drive the first roller 512 to rotate on the pipe, thereby driving the device to move on the pipe.

[0025] Furthermore, a first slider 514 is fixedly connected to the top of the rack 513 . The first slider 514 is slidably connected to the fixed shell 501 , and the first slider 514 is in a “T” shape.

[0026] By adopting the above technical solution, the first sliding block 514 enables the rack 513 to remain stable during the movement.

[0027] Furthermore, one end of the third rotating rod 516 is fixedly connected to the third gear 515, the outside of the third rotating rod 516 is fixedly connected to the first large gear 517, the inside of the fixed shell 501 is rotatably connected to the fourth rotating rod 521, the outside of the fourth rotating rod 521 is fixedly connected to the second large gear 520, the inside of the first rotating arm 519 is fixedly connected to the first small gear 518, and the inside of the second rotating arm 523 is fixedly connected to the second small gear 522.

[0028] Furthermore, the rack 513 is meshed and connected with the third gear 515 , the first large gear 517 is meshed and connected with the first small gear 518 and the second large gear 520 respectively, and the second large gear 520 is meshed and connected with the second small gear 522 .

[0029] By adopting the above technical solution, the rack 513 drives the third gear 515 to rotate, and the third gear 515 drives the first large gear 517 to rotate through the third rotating rod 516. The first large gear 517 drives the first small gear 518 and the second large gear 520 respectively, and the second large gear 520 drives the second small gear 522 to rotate. The first small gear 518 and the second small gear 522 respectively drive the first rotating arm 519 and the second rotating arm 523 to move. The first rotating arm 519 and the second rotating arm 523 respectively drive the second roller 524 to approach the pipe, so that the device can adapt to pipes of different sizes and achieve smooth movement along the surface of the pipe.

[0030] Furthermore, a first motor 2 is fixedly connected to one side of the support frame 1, and a forward and reverse screw rod 3 is rotatably connected inside the support frame 1. The first motor 2 is fixedly connected to the forward and reverse screw rod 3, and the forward and reverse screw rod 3 is rotatably connected to the connecting plate 4.

[0031] By adopting the above technical solution, the first motor 2 drives the forward and reverse screw rods 3 to rotate inside the support frame 1, and the forward and reverse screw rods 3 drive the connecting plate 4 to move toward the center of the support frame 1.

[0032] Furthermore, a second slider 8 is fixedly connected to the inner side of the movable shell 6, a slide groove 9 is opened on the outside of the semicircular frame 7, a third motor 10 is fixedly connected to one side of the movable shell 6, a worm 11 is rotatably connected inside the movable shell 6, a fifth rotating rod 13 and a sixth rotating rod 16 are rotatably connected inside the movable shell 6, a worm gear 12 is fixedly connected to the outside of the fifth rotating rod 13, a first bevel gear 14 is fixedly connected to the bottom of the fifth rotating rod 13, one end of the sixth rotating rod 16 is fixedly connected to the second bevel gear 15, the other end of the sixth rotating rod 16 is fixedly connected to the fourth gear 17, and an arc-shaped rack 18 is fixedly connected to the inside of the semicircular frame 7.

[0033] Furthermore, the cross section of the second sliding groove 9 is “T”-shaped, and the second sliding block 8 is slidably connected to the sliding groove 9 on the semicircular frame 7 .

[0034] By adopting the above technical solution, the second sliding block 8 on the movable shell 6 slides in the sliding groove 9 on the semicircular frame 7, which ensures that the movable shell 6 can remain stable during the movement.

[0035] Furthermore, the third motor 10 is fixedly connected to the worm 11 , the worm 11 is meshedly connected to the worm wheel 12 , the first bevel gear 14 is meshedly connected to the second bevel gear 15 , and the fourth gear 17 is meshedly connected to the arc rack 18 .

[0036] By adopting the above technical solution, the third motor 10 drives the worm 11 to rotate, the worm 11 drives the worm wheel 12 to rotate, the worm wheel 12 drives the first bevel gear 14 to rotate through the fifth rotating rod 13, the first bevel gear 14 drives the second bevel gear 15 to rotate, the second bevel gear 15 drives the fourth gear 17 to rotate through the sixth rotating rod 16, and the fourth gear 17 moves on the arc rack 18, thereby prompting the movable shell 6 to move on the semicircular frame 7.

[0037] Furthermore, the electromagnetic ultrasonic thickness gauge 21 includes a communication transmission module, a transmission control module, a driving module and an EMAT coil.

[0038] By adopting the above technical solution, a high-frequency current passes through the EMAT coil in the device to generate an alternating magnetic field and eddy currents of the same frequency on the metal surface. The alternating eddy current generates a Lorentz magnetic force under the action of the magnetic field generated by the permanent magnet, causing the particles in the test piece to vibrate, generating shear waves with a propagation direction perpendicular to the vibration direction. Through shear wave conversion, a waveform at a certain angle to the measurement surface is obtained, thereby realizing automatic detection of irregular surfaces.

[0039] Working principle: When in use, the staff uses the handle 22 to hang the device on the outer wall of the pipe. At this time, the device is in the initial state, the spring 504 set on the moving rod 503 remains in the natural state, the first rotating arm 519 and the second rotating arm 523 are symmetrically expanded, and then the first motor 2 is started. The first motor 2 drives the forward and reverse screw rods 3 to rotate, and the forward and reverse screw rods 3 drive the connecting plate 4 to move toward the center of the support frame 1. The connecting plate 4 drives the fixed shell 501 to move toward the pipe, so that the first roller 5 on the connecting shell 505 is rotated. 12 contacts the surface of the pipe, but the first motor 2 is still rotating, the connecting shell 505 pushes the moving rod 503 to move into the fixed rod 502, and the fixed rod 502 squeezes the spring 504 sleeved on the moving rod 503. At the same time, the connecting shell 505 pushes the rack 513 to move, and the rack 513 drives the first slider 514 to slide on the fixed shell 501, and the rack 513 also drives the third gear 515 to rotate, and the third gear 515 drives the first large gear 517 to rotate through the third rotating rod 516. The first large gear 517 The first large gear 517 drives the second large gear 520 and the fourth rotating rod 521 to rotate, and the second large gear 520 drives the second small gear 522 to rotate. The first small gear 518 and the second small gear 522 respectively drive the first rotating arm 519 and the second rotating arm 523 to move. The first rotating arm 519 and the second rotating arm 523 respectively drive the second roller 524 to move closer to the pipe. When the first motor 2 cannot drive the forward and reverse screw rod 3 to rotate, the first rotating arm 519 and the second rotating arm 523 respectively drive the second roller 524 to move closer to the pipe. The second roller 524 on the second rotating arm 523 contacts the surface of the pipe, and during this process, the position of the device is adjusted so that the center line of the semicircular frame 7 coincides with the axis of the pipe. As a result, when the spring 504 changes from a natural state to a compressed state, the first rotating arm 519 and the second rotating arm 523 are prompted to switch from an expanded state to a retracted state, making the device suitable for pipes of different sizes while ensuring that the semicircular frame 7 is coaxial with the pipe. This allows the device to adapt to pipes of different sizes and maintain the coaxiality of the semicircular frame 7 and the pipe.

[0040] Then, the third motor 10 is started, the third motor 10 drives the worm 11 to rotate, the worm 11 drives the worm wheel 12 to rotate, the worm wheel 12 drives the first bevel gear 14 to rotate through the fifth rotating rod 13, the first bevel gear 14 drives the second bevel gear 15 to rotate, the second bevel gear 15 drives the fourth gear 17 to rotate through the sixth rotating rod 16, the fourth gear 17 moves on the arc rack 18, and the movable shell 6 is prompted to move on the semicircular frame 7, and the movable shell 6 drives the second slider 8 to slide in the slide groove 9 on the semicircular frame 7, and the electromagnetic ultrasonic thickness gauge 21 is also driven by the movable shell 6. When the movable shell 6 drives the electromagnetic ultrasonic When the thickness gauge 21 moves to the specified position, the third motor 10 is paused, and the self-locking property of the worm 11 and the worm wheel 12 allows the movable shell 6 to stop at the specified position on the semicircular frame 7 without sliding. Then, the electric telescopic rod 20 is started, and the electric telescopic rod 20 extends the electromagnetic ultrasonic thickness gauge 21, allowing the electromagnetic ultrasonic thickness gauge 21 to approach the surface of the pipe without touching the surface of the pipe. After that, the second motor 506 is started, which prompts the first roller 512 to drive the device to move on the pipe. In this way, the position of the electromagnetic ultrasonic thickness gauge 21 can be adjusted so that the electromagnetic ultrasonic thickness gauge 21 can measure the wall thickness of different positions of the pipe.

[0041] 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 the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A calibration method and device for measuring the wall thickness of a pipe, comprising a support frame (1), characterized in that: One end of the support frame (1) is fixedly connected to a semicircular frame (7), the semicircular frame (7) is externally slidably connected to a movable shell (6), one end of the movable shell (6) is fixedly connected to a fixed block (19), the fixed block (19) is internally fixedly connected to an electric telescopic rod (20), the bottom of the electric telescopic rod (20) is fixedly connected to an electromagnetic ultrasonic thickness gauge (21), the support frame (1) is internally slidably connected to a connecting plate (4), the connecting plate (4) is provided with a moving mechanism (5) for adapting to pipes of different sizes, the bottom of the connecting plate (4) is fixedly connected to a fixed shell (501), one side of the fixed shell (501) is fixedly connected to a fixed rod (502), the fixed rod (502) is internally slidably connected to a movable rod (503), and the rod body of the movable rod (503) is provided with a spring ( 504), one side of the movable rod (503) is fixedly connected to a connecting shell (505), the connecting shell (505) is internally rotatably connected to a second rotating rod (511), the second rotating rod (511) is externally fixedly connected to a first roller (512), one side of the connecting shell (505) is fixedly connected to a rack (513), the fixed shell (501) is internally rotatably connected to a third rotating rod (516), one end of the third rotating rod (516) is fixedly connected to a third gear (515), the fixed shell (501) is internally rotatably connected to a first rotating arm (519) and a second rotating arm (523), one side of the first rotating arm (519) and the second rotating arm (523) is rotatably connected to a second roller (524), and the top of the support frame (1) is fixedly connected to a handle (22).

2. A calibration method and device for measuring pipe wall thickness according to claim 1, characterized in that: The top of the connecting shell (505) is fixedly connected to a second motor (506), the interior of the connecting shell (505) is rotatably connected to a first rotating rod (507), the exterior of the first rotating rod (507) is fixedly connected to a first gear (508), the first gear (508) is meshedly connected to a synchronous belt (509), the exterior of the second rotating rod (511) is fixedly connected to a second gear (510), the second motor (506) is fixedly connected to the first rotating rod (507), and the second gear (510) is meshedly connected to the synchronous belt (509).

3. A calibration method and device for measuring pipe wall thickness according to claim 1, characterized in that: A first slider (514) is fixedly connected to the top of the rack (513), the first slider (514) is slidably connected to the fixed shell (501), and the first slider (514) is in a "T" shape.

4. A calibration method and device for measuring pipe wall thickness according to claim 1, characterized in that: One end of the third rotating rod (516) is fixedly connected to a third gear (515), the outside of the third rotating rod (516) is fixedly connected to a first large gear (517), the inside of the fixed housing (501) is rotatably connected to a fourth rotating rod (521), the outside of the fourth rotating rod (521) is fixedly connected to a second large gear (520), the inside of the first rotating arm (519) is fixedly connected to a first small gear (518), and the inside of the second rotating arm (523) is fixedly connected to a second small gear (522).

5. A calibration method and device for measuring pipe wall thickness according to claim 4, characterized in that: The rack (513) is meshedly connected with the third gear (515), the first large gear (517) is meshedly connected with the first small gear (518) and the second large gear (520), and the second large gear (520) is meshedly connected with the second small gear (522).

6. A calibration method and device for measuring pipe wall thickness according to claim 1, characterized in that: A first motor (2) is fixedly connected to one side of the support frame (1), a forward and reverse screw rod (3) is rotatably connected inside the support frame (1), the first motor (2) is fixedly connected to the forward and reverse screw rod (3), and the forward and reverse screw rod (3) is rotatably connected to the connecting plate (4).

7. A calibration method and device for measuring pipe wall thickness according to claim 1, characterized in that: The inner side of the movable shell (6) is fixedly connected to a second slider (8), the outer side of the semicircular frame (7) is provided with a slide groove (9), one side of the movable shell (6) is fixedly connected to a third motor (10), the inner side of the movable shell (6) is rotatably connected to a worm (11), the inner side of the movable shell (6) is rotatably connected to a fifth rotating rod (13) and a sixth rotating rod (16), the outer side of the fifth rotating rod (13) is fixedly connected to a worm gear (12), the bottom of the fifth rotating rod (13) is fixedly connected to a first bevel gear (14), one end of the sixth rotating rod (16) is fixedly connected to a second bevel gear (15), the other end of the sixth rotating rod (16) is fixedly connected to a fourth gear (17), and the inner side of the semicircular frame (7) is fixedly connected to an arc-shaped rack (18).

8. A calibration method and device for measuring pipe wall thickness according to claim 7, characterized in that: The cross section of the second sliding groove (9) is T-shaped, and the second sliding block (8) is slidably connected to the sliding groove (9) on the semicircular frame (7).

9. A calibration method and device for measuring pipe wall thickness according to claim 7, characterized in that: The third motor (10) is fixedly connected to the worm (11), the worm (11) is meshedly connected to the worm wheel (12), the first bevel gear (14) is meshedly connected to the second bevel gear (15), and the fourth gear (17) is meshedly connected to the arc-shaped rack (18).

10. A calibration method and device for measuring pipe wall thickness according to claim 1, characterized in that: The electromagnetic ultrasonic thickness gauge (21) comprises a communication transmission module, a transmission control module, a drive module and an EMAT coil.

Images