Horizontal propelling device for pulsed eddy current detection probe

Abstract

The utility model discloses a horizontal propelling device for a pulsed eddy current testing probe, relates to the technical field of pulsed eddy current nondestructive testing auxiliary devices, and can solve the problem that the pulsed eddy current testing probe is unsmooth in advancing through the inner wall of an ultrahigh pressure tubular reactor. A pulse eddy current detection probe horizontal propelling device comprises a shell, a propelling device and a clamp holder. When the pulsed eddy current detection probe is used for scanning the inner wall body of the ultrahigh-pressure tubular reactor, the detection probe can be fixed through the holder arranged in the shell, so that the direct contact between the detection probe part and the ultrahigh-pressure tubular reactor body is avoided, the detection probe is effectively protected, and the service life of the ultrahigh-pressure tubular reactor is prolonged. And meanwhile, possible surface scratch on the inner pipe wall of the reactor in the movement process of the detection probe is also avoided. The device has a series of advantages of small size, light weight, simple installation, convenient carrying, good reliability and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of pulsed eddy current non-destructive testing auxiliary devices, in particular to a pulsed eddy current testing probe horizontal propulsion device. Background Art

[0002] Ultrahigh-pressure tubular reactors are key equipment in the production of high-pressure polyethylene and ethylene-vinyl acetate. Unlike conventional pressure vessels as defined in the "Regulations on Safety Technical Supervision of Stationary Pressure Vessels" (TSG 21-2016), ultrahigh-pressure tubular reactors typically operate at pressures between 100 and 350 MPa, making them classified as ultrahigh-pressure vessels. Due to the flammable and explosive nature of production media like high-pressure polyethylene, the consequences of a failure in an ultrahigh-pressure tubular reactor are incalculable. Furthermore, the structure of ultrahigh-pressure tubular reactors lacks the openness required for inspection, complicating the assessment of their structural safety and reliability. Several other major ultrahigh-pressure polyethylene plants in China have been documented to have experienced more than a dozen accidents due to factors such as the reactor's structure, materials, manufacturing, and operational management. For example, at Beijing Yanshan Petrochemical, a 180,000-ton annual high-pressure polyethylene plant was imported from abroad in 1974 and began operation in 1976. Since 1990, the ultrahigh-pressure tubular reactor has experienced numerous incidents involving cracks penetrating the reactor tube wall, leading to leaks of the ultrahigh-pressure medium within. Every accident results in a huge waste of manpower, material and financial resources.

[0003] Currently, several ultrahigh-pressure tubular reactors imported from abroad in the 1970s and 1980s have been in service for over 20 years, and the safety factor of the equipment is decreasing. Because ultrahigh-pressure tubular reactors are extremely expensive to build, if they are scrapped without undergoing a safety assessment, they will cause huge economic losses to the user. Therefore, research on the applicability of nondestructive testing methods for ultrahigh-pressure tubular reactors is a topic of great significance to the engineering and academic communities.

[0004] Traditional quality monitoring methods for ultrahigh-pressure tubular reactors include endoscopy, magnetic particle testing, and multi-frequency eddy current technology. Endoscopy is only effective for detecting surface defects, but the inner wall of an ultrahigh-pressure tubular reactor typically has a polyethylene powder layer approximately 1 mm thick. Therefore, endoscopy is not easily able to detect surface defects. Magnetic particle testing is typically used for pre-shipment inspection of ultrahigh-pressure tubular reactors during manufacturing, typically detecting cracks on the reactor's outer surface. Its detection capabilities for in-service ultrahigh-pressure tubular reactors are limited. Multi-frequency eddy current technology is an effective method for detecting cracks on the inner wall of ultrahigh-pressure tubular reactors. Petrochemical companies in the Yangtze River Delta region of China have introduced BASF's rotating multi-frequency eddy current testing technology for crack detection on the inner wall of ultrahigh-pressure polyethylene tubular reactors, achieving some success. However, in addition to detecting cracks in the inner wall of the ultrahigh-pressure tubular reactor, companies are also concerned about potential quality risks such as corrosion pitting, deformation, and uniform wall thinning. Pulsed eddy current technology is a new non-destructive testing technology that has been gradually promoted and applied to corrosion detection of industrial pipelines with coatings in recent years. It uses pulsed eddy current internal detection technology to not only detect crack defects in metal pipes, but also effectively detect corrosion, thinning, and overload deformation of the pipe itself. Based on this, relevant researchers have used pulsed eddy current detection technology to carry out detection applications on the inner pipe wall of ultra-high pressure tubular reactors in recent years.

[0005] However, the conventional pulsed eddy current detection technology mainly involves dragging the probe inside the ultra-high pressure tubular reactor by pulling it with a traction wire. This can easily cause wear on the probe casing and lead to deformation or local corrosion pits. Since the traction probe cannot observe the road conditions during movement, it is also easy to cause the traction wire to break, resulting in greater wear on the probe and not conducive to protecting the integrity of the inner wall surface of the ultra-high pressure tubular reactor. Utility Model Content

[0006] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a pulsed eddy current detection probe horizontal propulsion device that can solve the problem that the pulsed eddy current detection probe has difficulty in moving through the inner wall of an ultra-high pressure tubular reactor.

[0007] The utility model provides a horizontal propulsion device for a pulsed eddy current detection probe, comprising a shell, a propulsion device and a clamp, wherein detachable end covers are provided at both ends of the shell, the propulsion device comprises a boss and a driving wheel, the boss is divided into two groups, and the two groups of bosses are respectively arranged on the end covers, and each group of bosses is evenly arranged with three groups of driving wheels in a circumferential direction, a first through hole is provided on the boss, a threaded joint is provided on the end of the boss away from the end cover, a second through hole is provided on the threaded joint, the first through hole and the second through hole are connected, and the first through hole and the shell are connected; the clamp is arranged in the shell, and the clamp is used to fix the pulsed eddy current detection probe part.

[0008] According to an embodiment of the present invention, a pulsed eddy current probe horizontal propulsion device has at least the following beneficial effects: The pulsed eddy current probe horizontal propulsion device includes a housing, a propulsion device, and a clamp. Removable end caps are provided at both ends of the housing. The propulsion device includes bosses and drive wheels. The bosses are provided in two groups, each of which is disposed on the end caps. Each group of bosses is provided with three sets of drive wheels evenly distributed around the circumference. A first through-hole is defined in the boss. A threaded joint is provided at the end of the boss away from the end cap. A second through-hole is defined in the threaded joint. The first through-hole and the second through-hole are connected, and the first through-hole is connected to the housing. A clamp is disposed in the housing. The clamp is used to secure the pulsed eddy current probe. When the pulsed eddy current probe is used to scan the inner wall of an ultra-high-pressure tubular reactor, the probe can be secured using the clamp built into the housing. This prevents direct contact between the probe and the reactor, effectively protecting the probe and preventing surface scratches on the reactor inner wall caused by the probe during movement. It has a series of advantages such as small size and weight, easy installation, easy to carry, and good reliability.

[0009] According to the horizontal propulsion device of a pulsed eddy current detection probe described in the utility model, the clamp includes a fixed block, a clamping arm and a compression spring. The fixed block is arranged in the shell, and the clamping arm is arranged in the fixed block for radial movement along the shell. The compression spring can drive the clamping arm to move toward the axis of the shell.

[0010] According to the horizontal propulsion device for a pulsed eddy current detection probe described in the utility model, the outer diameter of the shell is 30mm-40mm.

[0011] According to the horizontal propulsion device for a pulsed eddy current detection probe described in the utility model, the outer diameter of the driving wheel is 10mm-14mm.

[0012] According to the horizontal propulsion device for a pulsed eddy current detection probe described in the utility model, the driving wheel is tightly connected to the inner wall of the reaction tube.

[0013] According to the horizontal propulsion device for a pulsed eddy current detection probe described in the utility model, the clamping arm is connected to the compression spring by hot-melt welding.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 This is a schematic structural diagram of a preferred embodiment of the present utility model;

[0017] Figure 2 This is a cross-sectional view of a preferred embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of a preferred embodiment of the present invention on the inner wall of a reaction tube.

[0019] Reference numerals: housing 10 , propulsion device 20 , boss 21 , first through hole 211 , driving wheel 22 , threaded joint 23 , second through hole 231 , clamper 30 , fixing block 31 , clamping arm 32 , compression spring 33 , reaction tube 40 . DETAILED DESCRIPTION

[0020] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0022] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0024] Reference Figures 1 to 3 A horizontal propulsion device for a pulsed eddy current detection probe includes a shell 10, a propulsion device 20 and a clamp 30. Removable end covers 11 are provided at both ends of the shell 10. The propulsion device 20 includes a boss 21 and a drive wheel 22. There are two groups of bosses 21. The two groups of bosses 21 are respectively arranged on the end covers 11. Each group of bosses 21 is evenly arranged with three groups of drive wheels 22 in the circumferential direction. A first through hole 211 is provided on the boss 21. A threaded joint 23 is provided at one end of the boss 21 away from the end cover 11. A second through hole 231 is provided on the threaded joint 23. The first through hole 211 and the second through hole 231 are connected, and the first through hole 211 is connected to the shell 10. The clamp 30 is arranged in the shell 10. The clamp 30 is used to fix the pulsed eddy current detection probe part.

[0025] Specifically, when using a pulsed eddy current probe to scan the inner wall of an ultrahigh-pressure tubular reactor, the probe can be secured using a holder 30 built into the housing 10. This prevents direct contact between the probe and the reactor, effectively protecting the probe and preventing surface scratches on the reactor's inner wall caused by the probe's movement. This device offers a range of advantages, including compact size and weight, easy installation, portability, and reliability.

[0026] Reference Figure 2 The clamp 30 includes a fixed block 31, a clamping arm 32, and a compression spring 33. The fixed block 31 is disposed in the housing 10. The clamping arm 32 is disposed in the fixed block 31 and is movable along the radial direction of the housing 10. The compression spring 33 can drive the clamping arm 32 to move toward the axis of the housing 10.

[0027] It can be understood that, in the embodiment of the present invention, two groups of clamps 30 are symmetrically arranged along the axis of the housing 10 , and the clamping arms 32 of the two groups of clamps 30 clamp the probes respectively under the drive of the compression springs 33 .

[0028] Furthermore, in some embodiments of the present invention, the outer diameter of the housing 10 is 30 mm-40 mm.

[0029] Furthermore, in some embodiments of the present invention, the outer diameter of the driving wheel 22 is 10 mm-14 mm.

[0030] Furthermore, in some embodiments of the present invention, the driving wheel 22 is tightly connected to the inner wall of the reaction tube 40 .

[0031] Furthermore, in some embodiments of the present invention, the clamping arm 32 is connected to the compression spring 33 by heat-melting welding.

[0032] It should be noted that, in the embodiment of the present invention, first, the elbow of the in-service ultra-high pressure reaction tube 40 to be inspected is disassembled, the pipe mouth is opened, and the excessive polyethylene powder impurities inside the reaction tube 40 are cleaned by high-pressure water flushing. Then the pulse eddy current detection probe part is placed in the cylindrical shell 10, and the probe part is fixed by the clamp 30. The signal connection line of the probe part can be led out through the first through hole 211 and the second through hole 231 to connect with the instrument. The threaded joint 23 can be spirally connected to the traction sleeve to pull the movement of the horizontal propulsion device. The inspection personnel put the horizontal propulsion device as a whole into the inside of the reaction tube 40, and control all the driving wheels 22 to achieve supporting contact with the inner wall surface of the ultra-high pressure reaction tube 40. By passing through the inner wall of the ultra-high pressure reaction tube 40, the detection of cracks, local thinning, and overload deformation defects on the inner wall of the ultra-high pressure reaction tube 40 can be achieved (see Figure 3 ).

[0033] It should be noted that when using this device, the overall horizontal propulsion speed must be controlled within 200mm / s-350mm / s. Also, when using a pulsed eddy current probe, the scanning speed should not exceed 350mm / s if an absolute probe is used, and 200mm / s if a differential probe is used.

[0034] The cylindrical housing 10, fixed block 31, clamping arm 32, end cap 11, drive wheel 22, boss 21, and threaded connector 23 of the present invention are all made of engineering plastics such as polyacetal, polyester, polyarylate, and polyphenylene sulfide. The compressible spring 33 is made of 304 series austenitic stainless steel or aluminum or aluminum alloy.

[0035] The present invention can quickly scan and inspect cracks, localized corrosion, and overload deformation defects in an in-service ultrahigh-pressure reaction tube 40. Compared to conventional pulsed eddy current built-in detection devices, the present invention can quickly and smoothly pass horizontally through various abnormal areas of the ultrahigh-pressure reaction tube 40. The use of drive wheels at both ends effectively prevents the scanning device from directly and violently rubbing against the inner surface of the ultrahigh-pressure reaction tube 40, effectively protecting the pulsed eddy current detection probe and ensuring that the inner surface of the ultrahigh-pressure reaction tube 40 will not be mechanically damaged during the scanning process. It has a series of advantages, including small size and weight, easy portability, simple installation and operation, and low cost.

[0036] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A pulsed eddy current detection probe horizontal propulsion device, characterized in that: include: A housing, a propulsion device and a clamp, wherein both ends of the housing are provided with detachable end covers; The propulsion device includes a boss and a drive wheel. The bosses are divided into two groups. The two groups of bosses are respectively arranged on the end cover. Each group of bosses has three groups of drive wheels evenly arranged around the circumference. A first through hole is formed on the boss. A threaded joint is provided at one end of the boss away from the end cover. A second through hole is formed on the threaded joint. The first through hole is connected to the second through hole, and the first through hole is connected to the housing. The holder is arranged in the housing and is used to fix the pulsed eddy current detection probe part.

2. A pulsed eddy current detection probe horizontal propulsion device according to claim 1, characterized in that: The clamp includes a fixed block, a clamping arm and a compression spring. The fixed block is arranged in the shell. The clamping arm is arranged in the fixed block so as to move radially along the shell. The compression spring can drive the clamping arm to move toward the axis of the shell.

3. The pulsed eddy current detection probe horizontal propulsion device according to claim 1, characterized in that: The outer diameter of the shell is 30mm-40mm.

4. A pulsed eddy current detection probe horizontal propulsion device according to claim 1, characterized in that: The outer diameter of the driving wheel is 10mm-14mm.

5. The pulsed eddy current detection probe horizontal propulsion device according to claim 1, characterized in that: The driving wheel is tightly connected to the inner wall of the reaction tube.

6. The pulsed eddy current detection probe horizontal propulsion device according to claim 2, characterized in that: The clamping arm is connected to the compression spring by heat-melting welding.

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