A kind of petrochemical plant does not dismantle thermal insulation thickness measuring equipment

Abstract

This invention discloses a non-removable insulation thickness measurement device for petrochemical plants, relating to the field of petrochemical testing technology. It includes a crawling trolley and two wrapping rings located at the bottom of the trolley. One wrapping ring is fixed to the bottom of the crawling trolley, and the two wrapping rings are connected by a plug-in joint and secured with bolts. A movable thickness measurement mechanism is connected to the wrapping rings. The movable thickness measurement mechanism includes a detection component connected to the wrapping rings. The detection component includes an annular opening, a motor, a gear, a half-tooth ring, an ultrasonic thickness measurement probe, a threaded cylinder, and a threaded shaft. This invention can overcome the shortcomings of traditional ultrasonic thickness measurement probes, such as incomplete coverage and easy omissions in single-line detection. It can also vibrate and compact the hollow areas of the internal insulation rock wool, reposition the outer sheet metal, improve the uniformity of the circumferential detection medium, further eliminate detection interference, and improve the accuracy and reliability of full-circumferential thickness measurement.

Description

Technical Field

[0001] This invention relates to the field of petrochemical testing technology, specifically to a non-disassembly insulation thickness measurement device for petrochemical plants. Background Technology

[0002] Petrochemical media mainly consist of crude oil, gasoline, diesel, liquefied gas, acids and alkalis, high-temperature steam, and corrosive materials. Over long-term operation, pipelines may experience various issues such as uniform corrosion of the inner wall, pitting, erosion and thinning, and corrosion under the insulation layer. Therefore, it is necessary to conduct irregular thickness measurements on pipelines used in petrochemical projects, which requires the use of appropriate thickness measurement equipment.

[0003] In existing technologies, electromagnetic ultrasonic thickness measurement is commonly used for oil pipeline thickness measurement to avoid removing the insulation layer. Typically, a mobile trolley that crawls along the outer wall of the pipeline moves the ultrasonic thickness measurement probe along the pipeline's axis. However, in practice, the ultrasonic thickness measurement probe often only moves along the outer circumference of the pipeline to measure its thickness. Due to the limited detection range of the ultrasonic thickness measurement probe, circumferential coverage of the pipeline is lacking, making it impossible to accurately detect pitting corrosion at the bottom, sides, and in areas with localized corrosion, as well as non-uniform corrosion under the insulation layer. This results in a high rate of missed detections and a lack of representativeness in wall thickness assessment. Furthermore, after long-term use, pipelines may experience issues such as warping, protrusions, and loose debris in the outer protective iron sheet layer under insulation conditions, and unevenness, looseness, and internal delamination of the insulation rock wool within the insulation layer. These problems can cause fluctuations in the air gap during electromagnetic ultrasonic testing, leading to inaccurate test results.

[0004] Therefore, there is a need for a non-disassembly insulation thickness measurement device for petrochemical plants to solve the problem that the detection range of ultrasonic thickness measurement probes is limited and the insulation layer is affected by long-term use, which easily leads to inaccurate detection results. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A non-removable insulation thickness measuring device for a petrochemical plant includes a crawling trolley and two wrapping rings located at the bottom of the crawling trolley. One of the wrapping rings is fixed to the bottom of the crawling trolley, and the two wrapping rings are connected by a plug-in joint and fixed by bolts. The wrapping rings are connected to a movable thickness measuring mechanism. The movable thickness measuring mechanism includes a detection component connected to a wrapping ring. The detection component includes an annular opening, a motor, a gear, a half-tooth ring, an ultrasonic thickness measuring probe, a threaded cylinder, and a threaded shaft. The annular opening is located at the middle position of the inner wall of the wrapping ring. The motor is fixed to the surface of one end of the wrapping ring, and the output end of the motor extends into the inner cavity of the annular opening and is rotatably connected to the inner wall of the annular opening. The gear is fixedly sleeved on the outer circumferential surface of the motor output end extending into the inner cavity of the annular opening. The half-tooth ring is rotatably inserted into the inner cavity of the annular opening, and the gear is meshed with the half-tooth ring. The threaded cylinder is fixed to the inner surface of one of the half-tooth rings, and the threaded shaft is threadedly connected to the inner cavity of the threaded cylinder. The ultrasonic thickness measuring probe is fixed to the bottom of the threaded shaft.

[0006] A further improvement of the technical solution of the present invention is that the detection component further includes a striking component, which includes a toothed block, a movable cylinder, a second gear, a sleeve, a first contact block, a contact shell, a contact rod, a limiting block, and a limiting groove. The toothed block is uniformly and equidistantly fixed around the inner wall of the two annular openings at a position located on one side of the half-toothed ring. The movable cylinder is rotatably sleeved on the outer circumferential surface of the threaded cylinder, and the second gear is fixedly sleeved on the top of the outer circumferential surface of the movable cylinder.

[0007] A further improvement of the technical solution of the present invention is as follows: the sleeve is fitted at the bottom position of the outer peripheral surface of the movable cylinder; the first abutment block is uniformly and equidistantly fixed around the side position of the bottom of the sleeve; the abutment shell is fixed at the middle position of the bottom of the sleeve; the abutment rod is fixed to the surface of one end of the ultrasonic thickness measuring probe; the abutment rod and the inner cavity of the abutment shell are slidably inserted and connected; the limiting groove is opened at the position of the outer peripheral surface of the movable cylinder near the sleeve; the limiting block is slidably inserted into the inner cavity of the limiting groove and fixed to the inner peripheral surface of the sleeve; and the second gear is meshed with the gear block.

[0008] A further improvement of the technical solution of the present invention is that: the striking component further includes a fixing plate, a striking rod, a first contact plate, a connecting spring, and a second contact block. The fixing plate is fixed to the surfaces on both sides of the ultrasonic thickness measuring probe. The striking rod is slidably inserted into the middle position of the fixing plate. The first contact plate is fixedly sleeved on the outer circumferential surface of the striking rod. The connecting spring is fixed at the middle position between the first contact plate and the fixing plate. The second contact block is fixed to the end of the striking rod. The end of the striking rod away from the second contact block is arc-shaped.

[0009] A further improvement of the technical solution of the present invention is that: the movable thickness measuring mechanism further includes a processing component located opposite the ultrasonic thickness measuring probe. The processing component includes a fixed frame, a rotating cylinder, a gear three, a pin, a threaded hole, a fastening bolt, and a scraper head. The fixed frame is fixed to the inner surface of another half-tooth ring. The rotating cylinder is rotatably connected to the inner wall of the fixed frame. The pin is slidably inserted into the inner wall of the rotating cylinder. The threaded holes are evenly opened on the side of the pin. The fastening bolt is threaded to the top of the outer circumferential surface of the rotating cylinder. The gear three is fixedly sleeved on the bottom of the outer circumferential surface of the rotating cylinder. The gear three is meshed with the tooth block. The scraper head is fixed to the end of the pin.

[0010] A further improvement of the technical solution of the present invention is that the processing component further includes a tube, a sliding shaft, a spring telescopic rod, a storage frame, and a heating roller. The tube is fixed to the surface of the fixing frame, the sliding shaft is slidably inserted into the inner cavity of the tube, the spring telescopic rod is fixed at the inner cavity positions on both sides of the top of the sliding shaft, the storage frame is fixed to the ends of the two spring telescopic rods, and the heating roller is rotatably connected to the inner cavity surface of the storage frame.

[0011] A further improvement of the technical solution of the present invention is that the processing component further includes a clamping plate, a second contact plate, and a limiting ring. The second contact plate is fixed to the outer surface of the insertion post. The two sets of clamping plates are fixed at the outer peripheral surfaces of the sliding shaft near the upper and lower ends of the second contact plate. The limiting ring is fixed at both ends of the second contact plate. The limiting ring is slidably inserted into the inner wall of the clamping plate.

[0012] A further improvement of the technical solution of the present invention is that: the movable thickness measuring mechanism further includes an anti-deviation component located at one end of the ultrasonic thickness measuring probe and the fixing frame. The anti-deviation component includes a connecting cylinder, a threaded rod, a mounting shaft, a positioning wheel, and a guide rod. The connecting cylinder is fixed to the inner wall of the wrapping ring. The mounting shaft is slidably inserted into the inner cavity of the connecting cylinder. The positioning wheel is fixed to the end of the mounting shaft. The threaded rod is threadedly connected to the inner wall of two of the wrapping rings. One end of the threaded rod extends to the inner cavity of the adjacent connecting cylinder and is rotatably connected to the surface of the mounting shaft.

[0013] A further improvement of the technical solution of the present invention is that: the anti-deviation component further includes an arc frame and an arc strip, the arc frame is fixed to the surface of two of the mounting shafts extending out of the connecting cylinder, the arc strip is slidably inserted into the inner cavity of the arc frame, and the arc strip is fixed to the surface of the other two mounting shafts extending out of the connecting cylinder.

[0014] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows: 1. This invention, through its detection components, enables the ultrasonic thickness gauge probe to rotate around the outer circumference of the pipe for detection. This overcomes the shortcomings of traditional ultrasonic thickness gauge probes, such as incomplete coverage and easy omissions due to single-line detection. By using segmented interval crawling combined with fixed-point full-circumferential scanning, it achieves both efficiency and full coverage of the pipe circumference, thereby improving the accuracy of pipe thickness measurement. In addition, the tapping component taps the outer wall of the pipe, which can vibrate and compact the hollow areas of the internal insulation rock wool, and reposition the outer sheet metal, improving the uniformity of the circumferential detection medium, further eliminating detection interference, and improving the accuracy and reliability of full-circumference thickness measurement.

[0015] 2. This invention, through its processing components, enables the flattening head to move in a circular motion while rotating on its own axis as it adheres to the protective sheeting of the pipe. This removes rust and other impurities adhering to the outer wall of the pipe on the crawling trolley. Furthermore, it can level any warped edges, protrusions, and loose debris on the outer wall of the pipe before ultrasonic thickness measurement, ensuring a smooth circular detection path and stable probe air gap, thereby improving detection accuracy.

[0016] 3. The present invention uses an anti-deviation component to position the crawling trolley and the wrapping ring when the four positioning wheels are in contact with the outer wall of the pipe. This prevents the crawling trolley from deviating when it is started, ensuring a stable detection trajectory and avoiding missed detections and misjudgments caused by axial deviation, thereby further improving the accuracy of the detection. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the wrapping ring in this invention; Figure 3 This is a schematic cross-sectional view of the three-dimensional structure of the wrapping ring in this invention; Figure 4 This is a three-dimensional cross-sectional view of a partial structure of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the threaded cylinder in this invention; Figure 6 In this invention Figure 5 Enlarged structural diagram at point A; Figure 7 This is a three-dimensional structural diagram of a partial structure in this invention; Figure 8 In this invention Figure 7 Enlarged schematic diagram of the structure at point B.

[0018] In the diagram: 1. Crawling trolley; 2. Wrapping ring; 3. Annular opening; 4. Motor; 5. Gear 1; 6. Half-tooth ring; 7. Ultrasonic thickness gauge probe; 8. Threaded cylinder; 9. Tooth block; 10. Movable cylinder; 11. Gear 2; 12. Threaded shaft; 13. Sleeve disc; 14. Abutting block 1; 15. Fixing plate; 16. Striking rod; 17. Abutting disc 1; 18. Connecting spring; 19. Abutting block 2; 20. Abutting shell; 21. Abutting rod; 22. Limiting block; 23. Limiting... 24. Slot; 25. Fixing frame; 26. Rotating cylinder; 27. Gear three; 28. Insert post; 29. ​​Threaded hole; 30. Fastening bolt; 31. Insert cylinder; 32. Sliding shaft; 33. Spring telescopic rod; 34. Clamping plate; 35. Storage frame; 36. Heating roller; 37. Scraper head; 38. Contact plate two; 39. Limiting ring; 40. Connecting cylinder; 41. Arc frame; 42. Arc strip; 43. Threaded rod; 44. Mounting shaft; 45. Positioning wheel; 46. Guide rod. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to embodiments: Example 1, First aspect, such as Figure 1 - Figure 8 As shown, the present invention provides a non-removable insulation thickness measuring device for petrochemical plants, including a crawling trolley 1 and a wrapping ring 2 located at the bottom of the crawling trolley 1. There are two wrapping rings 2, one of which is fixed to the bottom of the crawling trolley 1. The two wrapping rings 2 are connected by a plug-in joint and fixed by bolts. The wrapping ring 2 is connected to a movable thickness measuring mechanism. The active thickness measuring mechanism includes a detection component connected to the wrapping ring 2. The detection component includes an annular opening 3, a motor 4, a gear 5, a half-tooth ring 6, an ultrasonic thickness measuring probe 7, a threaded cylinder 8, and a threaded shaft 12. The annular opening 3 is located at the middle position of the inner wall of the wrapping ring 2. The motor 4 is fixed to the surface of one end of one of the wrapping rings 2. The output end of the motor 4 extends into the inner cavity of the annular opening 3 and is rotatably connected to the inner wall of the annular opening 3. The gear 5 is fixedly sleeved on the outer circumferential surface of the position where the output end of the motor 4 extends into the inner cavity of the annular opening 3. The half-tooth ring 6 is rotatably inserted into the position of the inner cavity of the annular opening 3. The gear 5 and the half-tooth ring 6 are meshed. The threaded cylinder 8 is fixed to the inner surface of one of the half-tooth rings 6. The threaded shaft 12 is threadedly connected to the inner cavity of the threaded cylinder 8. The ultrasonic thickness measuring probe 7 is fixed to the bottom of the threaded shaft 12.

[0020] When thickness measurement of a pipeline is required, the crawler trolley 1 and its fixed ring 2 are placed from the top of the pipeline. After placement, another ring 2 is inserted into the ring 2 at the bottom of the crawler trolley 1 and fixed with bolts, so that the two semi-toothed rings 6 can be spliced ​​into a complete ring structure. Then, by rotating the threaded shaft 12, the total length of the threaded cylinder 8 and the threaded shaft 12 can be adjusted under the action of the threaded structure inside the threaded cylinder 8. This allows adjustment of the distance between the ultrasonic thickness measuring probe 7 and the center position of the two rings 2, thus allowing the ultrasonic thickness measuring probe 7 to be adjusted to a position close to pipelines of different sizes, thereby performing ultrasonic thickness measurement on pipelines of different diameters. The gap of the crawler trolley 1 is controlled. After crawling a certain distance along the pipeline, the crawling trolley 1 can automatically adapt to pipelines of different diameters. This is a well-disclosed aspect of existing technology and will not be elaborated further here. When the crawling trolley 1 stops, the motor 4 is started to rotate gear 5. Under the meshing action of gear 5 and the half-tooth ring 6, the two half-tooth rings 6 can make circular motion, thereby driving the ultrasonic thickness gauge probe 7 and the threaded cylinder 8 to make circular motion. This allows the ultrasonic thickness gauge probe 7 to rotate around the outer circumference of the pipeline for detection. This can overcome the defects of incomplete coverage and easy omissions in the single-busline linear detection of the traditional ultrasonic thickness gauge probe 7. By using segmented interval crawling and fixed-point full-circumference scanning, both efficiency and full coverage of the pipeline circumference are achieved, thereby improving the accuracy of pipeline thickness measurement.

[0021] The detection assembly also includes a striking component, which comprises a toothed block 9, a movable cylinder 10, a second gear 11, a sleeve 13, a first contact block 14, a contact shell 20, a contact rod 21, a limiting block 22, and a limiting groove 23. The toothed block 9 is evenly and equidistantly fixed around the inner wall of the two annular openings 3 at a position located on one side of the semi-toothed ring 6. The movable cylinder 10 is rotatably sleeved on the outer circumferential surface of the threaded cylinder 8. The second gear 11 is fixedly sleeved on the top of the outer circumferential surface of the movable cylinder 10. The sleeve 13 is sleeved on the bottom position of the outer circumferential surface of the movable cylinder 10. The contact block... A 14 is evenly and equidistantly fixed around the side of the bottom of the sleeve 13. The abutment shell 20 is fixed at the middle position of the bottom of the sleeve 13. The abutment rod 21 is fixed to the surface of one end of the ultrasonic thickness measuring probe 7. The abutment rod 21 and the inner cavity of the abutment shell 20 are slidably inserted and connected. The limiting groove 23 is opened on the outer peripheral surface of the movable cylinder 10 near the sleeve 13. The limiting block 22 is slidably inserted into the inner cavity of the limiting groove 23 and fixed to the inner peripheral surface of the sleeve 13. The gear 11 and the tooth block 9 are meshed and connected.

[0022] By rotating the threaded shaft 12 to adjust the distance between the ultrasonic thickness probe 7 and the middle position of the two wrapping rings 2, the contact rod 21 and the inner cavity of the contact shell 20, and the limiting groove 23 and the limiting block 22 on the sleeve 13, allow the sleeve 13 to move closer to the center position of the wrapping ring 2 along with the ultrasonic thickness probe 7. When the threaded cylinder 8 moves in a circular motion with the ultrasonic thickness probe 7, the gear 11 will mesh with the tooth block 9, allowing the movable cylinder 10 to rotate on the outer circumference of the threaded cylinder 8. Thus, under the contact action of the inner cavity of the limiting groove 23 and the limiting block 22, the sleeve 13 will rotate, thereby driving the contact block 14 to move in a circular motion.

[0023] The striking component also includes a fixing plate 15, a striking rod 16, a first contact plate 17, a connecting spring 18, and a second contact block 19. The fixing plate 15 is fixed to the surfaces on both sides of the ultrasonic thickness probe 7. The striking rod 16 is slidably inserted into the middle position of the fixing plate 15. The first contact plate 17 is fixedly sleeved on the outer circumferential surface of the striking rod 16. The connecting spring 18 is fixed at the middle position between the first contact plate 17 and the fixing plate 15. The second contact block 19 is fixed to the end of the striking rod 16. The end of the striking rod 16 away from the second contact block 19 is arc-shaped.

[0024] When the first contact block 14 moves in a circular motion with the sleeve 13, it contacts the two second contact blocks 19 in sequence. When the first contact block 14 and the second contact block 19 are in contact, the striking rod 16 moves towards the center of the two wrapping rings 2, thereby causing the compression connecting spring 18 of the first contact plate 17 to deform. This allows the striking rod 16 to strike the outer wall of the pipe during the ultrasonic thickness measurement probe 7, thereby compacting the hollow areas of the internal insulation rock wool, repositioning the outer sheath, improving the uniformity of the circumferential detection medium, further eliminating detection interference, and improving the accuracy and reliability of the full circumferential thickness measurement. When the second contact block 19 separates from the first contact block 14, it can be reset under the rebound force of the connecting spring 18 to contact the next first contact block 14.

[0025] In Example 2, the second aspect, the movable thickness measuring mechanism further includes a processing component located opposite the ultrasonic thickness measuring probe 7. The processing component includes a fixed frame 24, a rotating cylinder 25, a gear 26, a pin 27, a threaded hole 28, a fastening bolt 29, and a scraper head 36. The fixed frame 24 is fixed to the inner surface of another half-tooth ring 6. The rotating cylinder 25 is rotatably connected to the inner wall of the fixed frame 24. The pin 27 is slidably inserted into the inner wall of the rotating cylinder 25. The threaded holes 28 are evenly opened on the side of the pin 27. The fastening bolt 29 is threaded to the top of the outer peripheral surface of the rotating cylinder 25. The gear 26 is fixedly sleeved on the bottom of the outer peripheral surface of the rotating cylinder 25. The gear 26 is meshed with the tooth block 9. The scraper head 36 is fixed to the end of the pin 27.

[0026] Before measuring the thickness of the pipe using the ultrasonic thickness probe 7, the length of the sliding insert 27 within the rotating cylinder 25 is adjusted by sliding the insert 27. This adjusts the distance between the scraper head 36 and the pipe until the scraper head 36 moves to the position where it fits against the protective sheet at the bottom of the pipe. The fastening bolt 29 is then rotated to extend it into the adjacent threaded hole 28, thus limiting the insertion insert 27. When the semi-toothed ring 6 rotates, it drives the fixing frame 24 to rotate, thereby facilitating the meshing of the gear 3 26 and the toothed block 9. The rotating cylinder 25 rotates under the combined action of the rotating cylinder 25 and the insertion post 27, causing the scraper head 36 to rotate. The scraper head 36 then moves in a circular motion while rotating on its own axis, which removes rust and other impurities attached to the outer wall of the pipe on the crawler trolley 1. It can also level the warped edges, protrusions and loose debris on the outer wall of the pipe in advance before the ultrasonic thickness probe 7 is detected, ensuring a smooth circular detection path and stable probe air gap, thereby improving detection accuracy.

[0027] The processing assembly also includes a tube 30, a sliding shaft 31, a spring telescopic rod 32, a storage frame 34, and a heating roller 35. The tube 30 is fixed to the surface of the fixing frame 24. The sliding shaft 31 is slidably inserted into the inner cavity of the tube 30. The spring telescopic rod 32 is fixed at the inner cavity positions on both sides of the top of the sliding shaft 31. The storage frame 34 is fixed to the ends of the two spring telescopic rods 32. The heating roller 35 is rotatably connected to the inner cavity surface of the storage frame 34.

[0028] Before the flattening head 36 processes the outer wall of the pipe, the heating roller 35 can be energized in advance, and the sliding shaft 31 can be slid to allow the heating roller 35 to contact the outer wall of the pipe, causing the spring telescopic rod 32 to deform. Under the rebound force of the spring telescopic rod 32, the heating roller 35 tightly adheres to the outer wall of the pipe and applies pressure to the outer wall. At the same time, the high temperature on the surface of the heating roller 35 can soften and flatten the raised edges of the outer protective iron sheet, thereby improving the flattening effect on the outer wall of the pipe. Furthermore, under the pressure applied to the pipe by the heating roller 35, when the ultrasonic thickness measuring probe 7 is used to tap and vibrate the hollow areas of the internal insulation rock wool during subsequent testing, the pressure is applied to the pipe protective iron sheet, making it fully adhere to the insulation rock wool, thereby further reducing hollow areas and improving the accuracy of the test.

[0029] The processing assembly also includes a clamping plate 33, a second contact plate 37, and a limiting ring 38. The second contact plate 37 is fixed to the outer surface of the insertion post 27. The two sets of clamping plates 33 are fixed to the outer peripheral surface of the sliding shaft 31 near the upper and lower ends of the second contact plate 37. The limiting ring 38 is fixed to the two ends of the second contact plate 37. The limiting ring 38 is slidably inserted into the inner wall of the clamping plate 33.

[0030] When the sliding insert 27 is slidable, the sliding shaft 31 can be driven to slide along the inner cavity of the insert 30 under the action of the contact plate 27 and the clamping plate 33. After the insert 27 is limited by the threaded hole 28 and the fastening bolt 29, the position of the sliding shaft 31 can be limited. Thus, the flattening head 36 and the storage frame 34 can be adjusted to approach the outer wall of the pipe simultaneously. When the contact plate 27 and the flattening head 36 rotate, the rotation state of the insert 27 can be limited under the action of the limit ring 38 and the inner wall of the clamping plate 33, making its rotation more stable.

[0031] In Example 3, the third aspect, the movable thickness measuring mechanism further includes an anti-deviation component located at one end of the ultrasonic thickness measuring probe 7 and the fixing frame 24. The anti-deviation component includes a connecting cylinder 39, a threaded rod 42, a mounting shaft 43, a positioning wheel 44, and a guide rod 45. The connecting cylinder 39 is fixed to the inner wall of the wrapping ring 2. The mounting shaft 43 is slidably inserted into the inner cavity of the connecting cylinder 39. The positioning wheel 44 is fixed to the end of the mounting shaft 43. The threaded rod 42 is threadedly connected to the inner wall of two of the wrapping rings 2. One end of the threaded rod 42 extends into the inner cavity of the adjacent connecting cylinder 39 and is rotatably connected to the surface of the mounting shaft 43.

[0032] Since the guide rod 45 can limit the mounting shaft 43, rotating the threaded rod 42 allows the mounting shaft 43 and the positioning wheel 44 to move closer to the center of the pipe when they engage with the threaded structure of the inner wall of the wrapping ring 2. This continues until the positioning wheel 44 fits against the outer wall of pipes of different sizes. When the four positioning wheels 44 fit against the outer wall of the pipe, they can position the crawling carriage 1 and the wrapping ring 2. This prevents the crawling carriage 1 from deviating when it is started, ensuring a stable detection trajectory and avoiding missed detections and misjudgments caused by axial deviation, thereby further improving the accuracy of the detection.

[0033] The anti-deviation assembly also includes an arc frame 40 and an arc strip 41. The arc frame 40 is fixed to the surface of two mounting shafts 43 extending out of the connecting cylinder 39. The arc strip 41 is slidably inserted into the inner cavity of the arc frame 40. The arc strip 41 is fixed to the surface of the other two mounting shafts 43 extending out of the connecting cylinder 39.

[0034] When one of the mounting shafts 43 located inside one of the wrapping rings 2 moves by rotating the threaded rod 42, it can drive the arc frame 40 to move when it moves towards the center position of the wrapping ring 2. Thus, under the action of the arc frame 40 and the arc strip 41, the mounting shaft 43 inside the other connecting cylinder 39 at the center of the wrapping ring 2 moves synchronously towards the center position of the wrapping ring 2, and the displacement range is the same. This makes it easy to adjust the four positioning wheels 44 to the position of contact with the outer wall of the pipe.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A non-removable insulation thickness measuring device for a petrochemical plant, comprising a crawling trolley (1) and a wrapping ring (2) located at the bottom of the crawling trolley (1), characterized in that: There are two wrapping rings (2), one of which is fixed to the bottom of the crawling trolley (1), and the two wrapping rings (2) are connected by a plug-in joint and fixed by bolts. The wrapping ring (2) is connected to a movable thickness measuring mechanism. The movable thickness measuring mechanism includes a detection component connected to the wrapping ring (2). The detection component includes an annular opening (3), a motor (4), a gear (5), a half-tooth ring (6), an ultrasonic thickness measuring probe (7), a threaded cylinder (8), and a threaded shaft (12). The annular opening (3) is located at the middle position of the inner wall of the wrapping ring (2). The motor (4) is fixed to the surface of one end of one of the wrapping rings (2). The output end of the motor (4) extends into the inner cavity of the annular opening (3) and is flush with the inner wall of the annular opening (3). The gear (5) is fixedly sleeved on the outer circumference of the output end of the motor (4) extending to the inner cavity of the annular opening (3). The half-tooth ring (6) is rotatably inserted into the inner cavity of the annular opening (3). The gear (5) and the half-tooth ring (6) are meshed together. The threaded cylinder (8) is fixed on the inner surface of one of the half-tooth rings (6). The threaded shaft (12) is threadedly connected to the inner cavity of the threaded cylinder (8). The ultrasonic thickness measuring probe (7) is fixed to the bottom of the threaded shaft (12).

2. The non-removable insulation thickness measuring device for petrochemical plants according to claim 1, characterized in that: The detection assembly also includes a striking component, which includes a toothed block (9), a movable cylinder (10), a second gear (11), a sleeve (13), a first contact block (14), a contact shell (20), a contact rod (21), a limiting block (22), and a limiting groove (23). The toothed block (9) is evenly and equidistantly fixed around the inner wall of the two annular openings (3) at a position on one side of the half-tooth ring (6). The movable cylinder (10) is rotatably sleeved on the outer circumferential surface of the threaded cylinder (8). The second gear (11) is fixedly sleeved on the top of the outer circumferential surface of the movable cylinder (10).

3. The non-removable insulation thickness measuring device for a petrochemical plant according to claim 2, characterized in that: The sleeve (13) is fitted onto the bottom of the outer circumference of the movable cylinder (10). The first abutment block (14) is evenly and equidistantly fixed around the side of the bottom of the sleeve (13). The abutment shell (20) is fixed at the middle of the bottom of the sleeve (13). The abutment rod (21) is fixed to the surface of one end of the ultrasonic thickness probe (7). The abutment rod (21) and the inner cavity of the abutment shell (20) are slidably inserted and connected. The limiting groove (23) is opened on the outer circumference of the movable cylinder (10) near the sleeve (13). The limiting block (22) is slidably inserted into the inner cavity of the limiting groove (23) and fixed to the inner circumference of the sleeve (13). The second gear (11) and the tooth block (9) are meshed and connected.

4. The non-removable insulation thickness measuring device for a petrochemical plant according to claim 3, characterized in that: The striking component also includes a fixing plate (15), a striking rod (16), a first contact plate (17), a connecting spring (18), and a second contact block (19). The fixing plate (15) is fixed to the surfaces on both sides of the ultrasonic thickness probe (7). The striking rod (16) is slidably inserted into the middle position of the fixing plate (15). The first contact plate (17) is fixedly sleeved on the outer circumferential surface of the striking rod (16). The connecting spring (18) is fixed at the middle position between the first contact plate (17) and the fixing plate (15). The second contact block (19) is fixed to the end of the striking rod (16). The end of the striking rod (16) away from the second contact block (19) is arc-shaped.

5. The non-removable insulation thickness measuring device for a petrochemical plant according to claim 3, characterized in that: The active thickness measuring mechanism also includes a processing component located opposite the ultrasonic thickness measuring probe (7). The processing component includes a fixed frame (24), a rotating cylinder (25), a gear three (26), a pin (27), a threaded hole (28), a fastening bolt (29), and a scraper head (36). The fixed frame (24) is fixed to the inner surface of another half-tooth ring (6). The rotating cylinder (25) is rotatably connected to the inner wall of the fixed frame (24). The pin (27) is slidably inserted into the inner wall of the rotating cylinder (25). The threaded hole (28) is evenly opened on the side of the pin (27). The fastening bolt (29) is threaded to the top of the outer circumferential surface of the rotating cylinder (25). The gear three (26) is fixedly sleeved on the bottom of the outer circumferential surface of the rotating cylinder (25). The gear three (26) is meshed with the tooth block (9). The scraper head (36) is fixed to the end of the pin (27).

6. The non-removable insulation thickness measuring device for a petrochemical plant according to claim 5, characterized in that: The processing assembly also includes a tube (30), a sliding shaft (31), a spring telescopic rod (32), a storage frame (34), and a heating roller (35). The tube (30) is fixed to the surface of the fixing frame (24). The sliding shaft (31) is slidably inserted into the inner cavity of the tube (30). The spring telescopic rod (32) is fixed at the inner cavity positions on both sides of the top of the sliding shaft (31). The storage frame (34) is fixed to the ends of the two spring telescopic rods (32). The heating roller (35) is rotatably connected to the inner cavity surface of the storage frame (34).

7. A non-removable insulation thickness measuring device for a petrochemical plant according to claim 6, characterized in that: The processing component also includes a clamping plate (33), a second contact plate (37), and a limiting ring (38). The second contact plate (37) is fixed to the outer surface of the insert (27). The two sets of clamping plates (33) are fixed to the outer peripheral surface of the sliding shaft (31) near the upper and lower ends of the second contact plate (37). The limiting ring (38) is fixed to the two ends of the second contact plate (37). The limiting ring (38) is slidably inserted into the inner wall of the clamping plate (33).

8. A non-removable insulation thickness measuring device for a petrochemical plant according to claim 1, characterized in that: The active thickness measuring mechanism also includes an anti-deviation component located at one end of the ultrasonic thickness measuring probe (7) and the fixing frame (24). The anti-deviation component includes a connecting cylinder (39), a threaded rod (42), a mounting shaft (43), a positioning wheel (44), and a guide rod (45). The connecting cylinder (39) is fixed to the inner wall of the wrapping ring (2). The mounting shaft (43) is slidably inserted into the inner cavity of the connecting cylinder (39). The positioning wheel (44) is fixed to the end of the mounting shaft (43). The threaded rod (42) is threaded to the inner wall of two of the wrapping rings (2). One end of the threaded rod (42) extends to the inner cavity of the adjacent connecting cylinder (39) and is rotatably connected to the surface of the mounting shaft (43).

9. A non-removable insulation thickness measuring device for a petrochemical plant according to claim 8, characterized in that: The anti-deviation assembly also includes an arc frame (40) and an arc strip (41). The arc frame (40) is fixed to the surface of two mounting shafts (43) extending out of the connecting cylinder (39). The arc strip (41) is slidably inserted into the inner cavity of the arc frame (40). The arc strip (41) is fixed to the surface of the other two mounting shafts (43) extending out of the connecting cylinder (39).

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