Method and apparatus for cleaning deposits from the interior of a petroleum pipe

Abstract

The application provides a petroleum pipe inner wall attachment cleaning method and device, belonging to the technical field of pipe cleaning, which comprises the following steps: placing the petroleum pipe in a high-temperature environment, forming loose holes on the attachment and keeping warm; controlling the rotation of the cutting knife to scrape off the attachment layer by layer, forming multiple annular recesses and annular blocks on the attachment; installing the heating block into the annular recess, and heating the side surface of the annular block by the heating block; using the linear motion distance of the heating knife mechanism being equal to half of the width of the annular block to cut off the multiple annular blocks; repeating the above steps until the thickness of the attachment is less than or equal to 0.3-0.5 mm; and then using the high-pressure water jet to impact the remaining attachment from the inside of the petroleum pipe. The petroleum pipe inner wall attachment cleaning method provided by the application can clean the attachment on the inner wall of the petroleum pipe completely, and will not damage the petroleum pipe.

Description

Technical Field

[0001] This invention belongs to the field of pipe cleaning technology, and more specifically, relates to a method and equipment for cleaning deposits on the inner wall of oil pipe fittings. Background Technology

[0002] After prolonged operation, oil pipelines in petroleum feedstock transportation equipment require cleaning to remove deposits that accumulate on their inner walls during the oil transport process. Failure to clean them promptly can affect the pipeline's transport capacity. Currently, for oil pipelines with severe deposits, methods such as forceful hammering are used. While this method can remove the deposits, it is incomplete, has poor cleaning results, and can easily damage the pipeline. Summary of the Invention

[0003] The purpose of this invention is to provide a method and equipment for cleaning deposits on the inner wall of oil pipe fittings, so as to solve the technical problems in the prior art that the cleaning of deposits on the inner wall of oil pipe fittings is incomplete, the cleaning effect is poor, and the oil pipe fittings are easily damaged.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a method for cleaning deposits on the inner wall of oil pipe fittings, comprising:

[0005] S1: Place oil pipe fittings in a high-temperature environment;

[0006] S2: Multiple densely arranged loosening holes are formed radially inside the oil pipe fitting towards the attachment, and high-temperature medium enters the loosening holes and is kept at a temperature for 1-1.5 hours;

[0007] S3: Control the cutting blade to rotate and scrape off the deposits on the inner wall of the oil pipe layer by layer, and the scraped thickness is one-tenth to one-ninth of the remaining thickness of the deposits; and control the cutting blade to move axially to form multiple spaced annular recesses on the deposits, dividing the deposits into multiple annular blocks.

[0008] S4: Install multiple heating blocks one by one into the annular recess, and the width of the heating block is equal to the width of the annular recess; the two sides of the heating block heat the sides of the adjacent annular block; the temperature of the heating block is higher than the temperature of the high-temperature environment;

[0009] S5: The heating knife mechanism moves linearly from the bottom surface of the annular recess toward the two adjacent annular blocks on both sides, and the heating knife mechanism is rotated circumferentially; the linear movement distance of the heating knife mechanism is equal to half the width of the annular block, thus cutting off multiple annular blocks;

[0010] S6: Repeat S2-S5 until the thickness of the attached material is less than or equal to 0.3-0.5 mm;

[0011] S7: Place the oil pipe fitting in a high-temperature environment and keep it warm for 0.5-1 hour; then use a high-pressure water jet to impact the remaining deposits from inside the oil pipe fitting.

[0012] In one possible implementation, the loosening holes are arranged in a rectangular array, and the diameter of the loosening holes is 8-12 mm, the axial distance between two adjacent loosening holes is 20-28 mm, and the depth of the loosening holes is one-tenth to one-ninth of the thickness of the attached material.

[0013] In one possible implementation, the loosening holes in two adjacent S2s are staggered along the thickness direction of the attachment.

[0014] In one possible implementation, the lower end of the heating block is provided with a receiving cavity and two communicating holes on both sides that communicate with the receiving cavity; two heating blade mechanisms are provided in the receiving cavity, and the width of the receiving cavity is greater than the length of the two heating blade mechanisms. The heating blade mechanism has the freedom to move along the width direction of the heating block, and the heating blade mechanism enters and exits the receiving cavity through the communicating holes.

[0015] In one possible implementation, the connecting hole is an elongated hole; the heating knife mechanism includes:

[0016] The slide rail is fixedly installed inside the receiving cavity and corresponds to the communicating hole;

[0017] The mounting base is disposed within the receiving cavity and is slidably connected to the slide rail; the mounting base has the freedom to move toward or away from the communicating hole;

[0018] A cyclic motion structure is disposed within the receiving cavity and mounted on the mounting base; the cyclic motion structure has a motion mounting surface disposed near the communicating hole, and the motion mounting surface has a degree of freedom to cyclically move along the length direction of the communicating hole;

[0019] A heating knife is mounted on the moving mounting surface, and the blade of the heating knife passes through the connecting hole and is located outside the heating block;

[0020] A pusher, installed in the receiving cavity and connected at one end to the mounting base, is used to drive the mounting base to move toward or away from the communicating hole.

[0021] In one possible implementation, the cyclic motion structure includes:

[0022] Four support rods are arranged in a rectangular array on the mounting base;

[0023] There are four sprockets, each mounted on one of the four support rods and rotatably connected to the support rods;

[0024] A chain is meshed with four sprockets; the motion mounting surface is located on the outer surface of the chain.

[0025] A drive motor is mounted on the mounting base and connected to one of the sprockets;

[0026] The heating blade structure is multiple and is evenly arranged on the moving mounting surface.

[0027] In one possible implementation, the bottom of the heating block is provided with a rotatably connected operating plate. The operating plate is provided with a heating protrusion for contacting the attached material to form a groove. A radial force is applied to the heating block, and the operating plate is rotated to allow the heating protrusion to enter the bottom surface of the annular recess until the heating blade contacts and aligns with the bottom surface of the annular recess. The height of the heating protrusion is less than or equal to 0.3 mm.

[0028] In one possible implementation, after the last scraping of the attachment by the cutting blade, the heating convex at the bottom of the heating block acts on the bottom surface of the annular recess for an extended period of time, the high-pressure water jet acts on the inner wall of the groove, and the radial dimension of the high-pressure water jet is less than one-tenth to one-fifth of the radial dimension of the groove.

[0029] The beneficial effects of the method for cleaning deposits on the inner wall of oil pipe fittings provided by this invention are as follows: Compared with the prior art, the method of this invention first places the oil pipe fitting to be cleaned in an insulated environment, then applies pressure to the inside of the oil pipe fitting towards the deposits to form densely arranged loosening holes, allowing a high-temperature medium to enter the loosening holes, thereby heating the inside of the deposits; then, a cutting tool, a heating block, and a heating blade mechanism are used to remove the deposits layer by layer; specifically, a cutting tool is first used to cut multiple annular recesses into the deposits to form multiple spaced-apart portions. The process involves creating an annular block, then inserting a heating block into the annular recess and heating both sides of the block. A heating blade mechanism then cuts from both sides of the heating block, adhering to the bottom surface of the annular recess, towards the annular block, thus removing the deposit in a ring shape. This process continues until the deposit thickness is 0.3-0.5 mm, and after maintaining the high temperature for a period of time, a high-pressure water jet is used to spray the remaining deposit, completely cleaning it. This method effectively removes deposits from the inner wall of oil pipe fittings without damaging them.

[0030] Another object of the present invention is to provide a device for cleaning deposits on the inner wall of oil pipe fittings, comprising any one of the above-mentioned methods for cleaning deposits on the inner wall of oil pipe fittings, and further comprising:

[0031] The working chamber has an inlet at the top and an inlet hole on one side; the oil pipe enters the working chamber through the inlet, and the oil pipe is arranged coaxially with the inlet hole.

[0032] The main support shaft includes multiple hollow pipe segments arranged at intervals, and the multiple hollow pipe segments are fixedly connected and arranged coaxially.

[0033] Multiple rotating shafts are installed between two adjacent hollow pipe sections; the two ends of each rotating shaft are slidably connected to the two hollow pipe sections and have the freedom to reciprocate along the axial direction of the main support shaft.

[0034] The cleaning device comprises multiple units, each mounted on one of the rotating shafts. Each cleaning device includes three linear actuators spaced apart along the length of the rotating shafts. The cutting blade, the heating block, and the water pipe for generating high-pressure water jets are respectively mounted on the three linear actuators.

[0035] In one possible implementation, the linear actuator for mounting the water pipe is provided with a connecting shaft, the connecting shaft being rotatably connected to the linear actuator, and the water pipe being mounted on the connecting shaft.

[0036] The oil pipe fitting inner wall cleaning device provided by this invention employs a method for cleaning oil pipe fitting inner wall deposits. In use, the oil pipe fitting is placed in the working chamber through its inlet, and then the main support shaft enters the working chamber through the inlet and penetrates the interior of the oil pipe fitting. A drive mechanism connected to a rotating shaft is installed within the hollow section of the main support shaft to drive the rotating shaft to rotate and move linearly. The drive mechanism controls the rotation of the rotating shaft, causing the cutting blade on the linear actuator to act on the deposits, achieving a cutting operation and forming an annular recess. The position of the cutting blade is controlled by the linear actuator. Simultaneously, under the action of the drive mechanism, the rotating shaft is controlled to undergo linear displacement, causing another linear actuator to align with the recess, and then a heating block and heating blade mechanism enter the annular recess. Finally, water from a third linear actuator impacts the groove on the bottom surface of the annular recess. This cleaning device is convenient and easy to use, with high cleaning accuracy and a high degree of integration. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of the structure of the method for cleaning deposits on the inner wall of oil pipe fittings provided in this embodiment of the invention. Figure 1 ;

[0039] Figure 2 A schematic diagram of the structure of the method for cleaning deposits on the inner wall of oil pipe fittings provided in this embodiment of the invention. Figure 2 .

[0040] The following are the labeling elements in the figure:

[0041] 10. Cutting blade; 11. Heating blade mechanism; 12. Slide rail; 13. Mounting base; 14. Circulating motion structure; 15. Moving mounting surface; 16. Heating blade; 17. Pusher; 18. Support rod; 19. Sprocket; 20. Chain; 21. Hollow pipe section; 22. Rotating shaft; 23. Cleaning device; 24. Linear actuator; 25. Water pipe; 26. Heating block. Detailed Implementation

[0042] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0043] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0044] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] Please see Figure 1 and Figure 2 The present invention will now describe a method for cleaning deposits on the inner wall of oil pipe fittings. A method for cleaning deposits on the inner wall of oil pipe fittings includes:

[0047] S1: Place the oil pipe fitting in a high-temperature environment until the temperature inside and outside the oil pipe fitting is the same;

[0048] S2: Multiple densely arranged loosening holes are formed radially inside the oil pipe fitting towards the attachment. High-temperature medium enters the loosening holes and is kept at a temperature for 1-1.5 hours.

[0049] S3: Control the cutting tool 10 to rotate and scrape off the deposits on the inner wall of the oil pipe layer by layer, and the scraping thickness is one-tenth to one-ninth of the remaining thickness of the deposits; and control the cutting tool 10 to move axially to form multiple spaced annular recesses on the deposits, dividing the deposits into multiple annular blocks.

[0050] S4: Install multiple heating blocks 26 one by one into the annular recess, and the width of the heating block 26 is equal to the width of the annular recess; the two sides of the heating block 26 heat the sides of the adjacent annular block; the temperature of the heating block 26 is higher than the temperature of the high-temperature environment.

[0051] S5: The heating knife mechanism 11 moves linearly from the bottom surface of the annular recess toward the two adjacent annular blocks on both sides, and the heating knife mechanism 11 is rotated circumferentially; the linear movement distance of the heating knife mechanism 11 is equal to half the width of the annular block, and multiple annular blocks are cut off.

[0052] S6: Repeat S2-S5 until the thickness of the attached material is less than or equal to 0.3-0.5 mm;

[0053] S7: Place the oil pipe fitting in a high-temperature environment and keep it warm for 0.5-1 hour; then use a high-pressure water jet to impact the remaining deposits from inside the oil pipe fitting.

[0054] The method for cleaning deposits on the inner wall of oil pipe fittings provided by this invention, compared with the prior art, first places the oil pipe fitting to be cleaned in an insulated environment, then applies pressure to the inside of the oil pipe fitting towards the deposits to form densely arranged loosening holes, allowing a high-temperature medium to enter the loosening holes, thereby heating the inside of the deposits; then, a cutting blade 10, a heating block 26, and a heating blade mechanism 11 are used to remove the deposits layer by layer; specifically, the cutting blade 10 is first used to cut multiple annular recesses into the deposits to form multiple spaced annular blocks, and then a heating blade mechanism 11 is used to remove the deposits layer by layer. Block 26 enters the annular recess and heats both sides of the annular block. Then, the heating knife mechanism 11 cuts from both sides of the heated block 26, adhering to the bottom surface of the annular recess, towards the annular block, thereby cleaning away the adhering material in a ring shape. After the thickness of the adhering material is 0.3-0.5mm, and after continuing to be in a high-temperature state for a period of time, a high-pressure water jet is used to spray the remaining adhering material to completely clean it. In this way, the adhering material on the inner wall of the oil pipe can be thoroughly cleaned without damaging the oil pipe.

[0055] In one specific embodiment of the method for cleaning deposits on the inner wall of oil pipe fittings provided by the present invention, the loosening holes are arranged in a rectangular array, with a hole diameter of 8-12 mm and an axial distance of 20-28 mm between two adjacent loosening holes; the depth of the loosening holes is one-tenth to one-ninth of the thickness of the deposit; the hole diameter and density of the loosening holes are limited to ensure that the loosening holes have a significant effect on the deposit after being opened on it. At the same time, the depth of the loosening holes is set to be similar to the depth of the annular recess, making the operation of the cutting tool 10 more accurate and faster.

[0056] The heating blade 16 of the heating blade mechanism 11 is made of metal or ceramic, and one end of the heating blade 16 located in the receiving cavity has an electrical connection hole for heating the heating blade 16. The high-temperature environment is 90-110℃. Pressure is maintained during the heat preservation process.

[0057] As a specific embodiment of the method for cleaning attachments on the inner wall of oil pipe fittings provided by the present invention, the loosening holes in two adjacent S2 steps are staggered along the thickness direction of the attachments; thus, the range of action of the loosening holes on the attachments is wider in the length direction of the oil pipe fitting, making the entire attachment easier to clean.

[0058] Please see Figure 1As a specific embodiment of the method for cleaning deposits on the inner wall of oil pipe fittings provided by the present invention, the lower end of the heating block 26 is provided with a receiving cavity and two communicating holes on both sides communicating with the receiving cavity; two heating blade mechanisms 11 are provided in the receiving cavity, and the width of the receiving cavity is greater than the length of the two heating blade mechanisms 11. The heating blade mechanism 11 has the freedom to move along the width direction of the heating block 26, and the heating blade mechanism 11 passes through the communicating holes to enter and exit the receiving cavity; that is, a receiving cavity is opened at the bottom of the heating block 26, and the heating blade mechanism 11 is installed in the receiving cavity. In use, the heating blade 16 in the heating blade mechanism 11 passes through the communicating holes and cuts the side bottom of the annular block. The heating blade 16 is set to reciprocate to improve the cutting effect and efficiency. The heating blade 16 is slidably sealed to the heating block 26.

[0059] Please see Figure 1 and Figure 2 As a specific embodiment of the method for cleaning deposits on the inner wall of oil pipe fittings provided by the present invention, the connecting hole is an elongated hole; the heating knife mechanism 11 includes a slide rail 12, a mounting base 13, a cyclic motion structure 14, a heating knife 16, and a pusher 17. The slide rail 12 is fixedly installed in the receiving cavity and corresponds to the connecting hole; the mounting base 13 is disposed in the receiving cavity and is slidably connected to the slide rail 12; the mounting base 13 has the freedom to move toward or away from the connecting hole; the cyclic motion structure 14 is disposed in the receiving cavity and mounted on the mounting base 13; the cyclic motion structure 14 has a motion mounting mechanism located close to the connecting hole. The moving mounting surface 15 has a degree of freedom to move cyclically along the length of the connecting hole; the heating blade 16 is mounted on the moving mounting surface 15, and the cutting edge of the heating blade 16 passes through the connecting hole and is located outside the heating block 26; the pusher 17 is mounted in the receiving cavity, and one end is connected to the mounting base 13, for driving the mounting base 13 to move toward or away from the connecting hole; specifically, by means of the pusher 17 acting on the mounting base 13, the cyclic motion structure 14 and the heating blade 16 are controlled to move toward the annular block, and under the control of the cyclic motion structure 14, the heating blade 16 reciprocates or cyclically to cut off the annular block. The cyclic motion structure 14 can perform linear reciprocating motion or circular motion. During the linear reciprocating motion, the heating plate acting on the annular block remains unchanged, while during the circular motion, multiple sets of different heating blades 16 can be used to act on the annular block.

[0060] Please see Figure 1 and Figure 2As a specific embodiment of the method for cleaning deposits on the inner wall of oil pipe fittings provided by the present invention, the cyclic motion structure 14 includes support rods 18, sprockets 19, chains 20, and a drive motor. There are four support rods 18 arranged in a rectangular array on the mounting base 13. Each of the four support rods 18 is mounted on one of the four support rods 19 and rotatably connected to it. The chain 20 is meshed with the four sprockets 19. A motion mounting surface 15 is located on the outer surface of the chain 20. The drive motor is mounted on the mounting base 13 and connected to one of the sprockets 19. Multiple heating blades 16 are evenly arranged on the motion mounting surface 15. Heating blades 16 are mounted on all four motion mounting surfaces 15 of the cyclic motion structure 14, thus forming a cyclic motion process, controlling the four sets of heating blades 16 to cyclically act on the annular block. The drive motor is connected to one of the sprockets 19, thereby driving the chain 20 to rotate.

[0061] Please see Figure 1 and Figure 2 In a specific embodiment of the method for cleaning deposits on the inner wall of oil pipe fittings provided by the present invention, the bottom of the heating block 26 is provided with a rotatably connected operating plate. The operating plate is provided with a heating protrusion for contacting the deposits to form a groove. A radial force is applied to the heating block 26, and the operating plate is rotated to allow the heating protrusion to enter the bottom surface of the annular recess until the heating blade 16 contacts and aligns with the bottom surface of the annular recess. The height of the heating protrusion is less than or equal to 0.3 mm. When the heating block 26 is used to heat the side of the annular block, the heating protrusion at the bottom of the heating block 26 acts on the bottom surface of the annular recess. Therefore, the heating of the deposits in the next step begins during the previous step of cutting the annular block, further improving the cutting action of the cutting blade 10 and improving the efficiency and effect of the entire deposit cleaning method. Furthermore, the operating plate is rotatably connected to the heating block 26, thereby achieving the effective range of the heating protrusion by means of the rotation of the operating plate.

[0062] Please see Figure 1 and Figure 2In a specific embodiment of the method for cleaning deposits on the inner wall of oil pipe fittings provided by the present invention, after the last scraping of the deposits by the cutting blade 10, the heating convex at the bottom of the heating block 26 acts on the bottom surface of the annular recess for an extended period, and the high-pressure water jet acts on the inner wall of the groove. Furthermore, the radial dimension of the high-pressure water jet is less than one-tenth to one-fifth of the radial dimension of the groove. That is, when the remaining deposit thickness is 0.3-0.5 mm, the heating convex at the bottom of the heating block 26 in the previous step acts on the bottom surface of the annular recess for a period extended to twice the previous time, maximizing the formation of the groove on the bottom surface of the annular recess, facilitating the impact of the high-pressure water jet to remove the remaining deposits. Moreover, the radial dimension of the high-pressure water jet is limited to one-tenth to one-fifth of the radial dimension of the groove, and the high-pressure water jet is set at an angle to the inner wall of the groove, thereby more effectively washing away the deposits.

[0063] Please see Figure 1 and Figure 2 This invention also provides a device for cleaning deposits on the inner wall of oil pipe fittings. The device includes any one of the above-mentioned methods for cleaning deposits on the inner wall of oil pipe fittings, and further includes a working chamber, a main support shaft, a rotating shaft 22, and cleaning components. The upper end of the working chamber has an inlet, and one side has an inlet hole. The oil pipe fitting passes through the inlet and enters the working chamber, and the oil pipe fitting and the inlet hole are arranged coaxially. The main support shaft includes multiple spaced hollow pipe sections 21, which are fixedly connected and coaxially arranged. There are multiple shafts 22, which are respectively installed between two adjacent hollow pipe sections 21; the two ends of the rotating shaft 22 are respectively slidably connected to the two hollow pipe sections 21, and have the freedom to reciprocate along the axial direction of the main support shaft; there are multiple cleaning devices 23, which are respectively installed on multiple rotating shafts 22; the cleaning device 23 includes three linear actuators 24 arranged at intervals along the length direction of the rotating shaft 22, and the cutting blade 10, the heating block 26 and the water pipe 25 for generating high-pressure water jet are respectively installed on the three linear actuators 24.

[0064] The oil pipe fitting inner wall attachment cleaning device provided in this embodiment of the invention adopts the above-mentioned oil pipe fitting inner wall attachment cleaning method. In use, the oil pipe fitting is placed in the working chamber through its inlet, and then the main support shaft enters the working chamber through the inlet and penetrates the inside of the oil pipe fitting. A drive mechanism connected to the rotating shaft 22 is installed in the hollow pipe section 21 of the main support shaft to drive the rotating shaft 22 to rotate and move linearly. The drive mechanism controls the rotation of the rotating shaft 22, causing the cutting blade 10 on the linear actuator 24 to act on the attachment to achieve a cutting operation and form an annular recess. The position of the cutting blade 10 is controlled by the linear actuator 24. Simultaneously, under the action of the drive mechanism, the rotating shaft 22 is controlled to undergo linear displacement, so that another linear actuator 24 corresponds to the recess, and then the heating block 26 and the heating blade mechanism 11 enter the annular recess. Finally, the water pipe 25 on the third linear actuator 24 impacts the groove on the bottom surface of the annular recess. This cleaning device is convenient and easy to use, has high cleaning accuracy, and a high degree of integration.

[0065] Please see Figure 1 and Figure 2 As a specific embodiment of the oil pipe fitting inner wall attachment cleaning device provided by the present invention, a connecting shaft is provided on the linear actuator 24 for mounting the water pipe 25. The connecting shaft is rotatably connected to the linear actuator 24, and the water pipe 25 is mounted on the connecting shaft. In use, the angle of the water pipe 25 can be changed by changing the rotation angle of the connecting shaft, thereby making the high-pressure water jet sprayed from the water pipe 25 more accurately act on the attachments on the inner wall of the groove. A mounting block is provided on the free end of the linear actuator 24, and the connecting shaft is rotatably connected to the mounting block. A motor or the like is installed inside the mounting block and is connected to the connecting shaft for transmission.

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for cleaning deposits on the inner wall of oil pipe fittings, characterized in that, include: S1: Place oil pipe fittings in a high-temperature environment; S2: Multiple densely arranged loosening holes are formed radially inside the oil pipe fitting towards the attachment, and high-temperature medium enters the loosening holes and is kept at a temperature for 1-1.5 hours; S3: Control the cutting blade to rotate and scrape off the deposits on the inner wall of the oil pipe layer by layer, and the scraped thickness is one-tenth to one-ninth of the remaining thickness of the deposits; and control the cutting blade to move axially to form multiple spaced annular recesses on the deposits, dividing the deposits into multiple annular blocks. S4: Install multiple heating blocks one by one into the annular recess, and the width of the heating block is equal to the width of the annular recess; the two sides of the heating block heat the sides of the adjacent annular block; the temperature of the heating block is higher than the temperature of the high-temperature environment; S5: The heating knife mechanism moves linearly from the bottom surface of the annular recess toward the two adjacent annular blocks on both sides, and the heating knife mechanism is rotated circumferentially; the linear movement distance of the heating knife mechanism is equal to half the width of the annular block, thus cutting off multiple annular blocks; S6: Repeat S2-S5 until the thickness of the attached material is less than or equal to 0.3-0.5 mm; S7: Place the oil pipe fitting in a high-temperature environment and keep it at that temperature for 0.5-1 hour; then use a high-pressure water jet to impact the remaining deposits from inside the oil pipe fitting. The heating block has a receiving cavity at its lower end and connecting holes on both sides that communicate with the receiving cavity; two heating blade mechanisms are provided in the receiving cavity, and the width of the receiving cavity is greater than the length of the two heating blade mechanisms. The heating blade mechanism has the freedom to move along the width direction of the heating block, and the heating blade mechanism enters and exits the receiving cavity through the connecting holes. The connecting hole is an elongated hole; the heating knife mechanism includes: The slide rail is fixedly installed inside the receiving cavity and corresponds to the communicating hole; The mounting base is disposed within the receiving cavity and is slidably connected to the slide rail; the mounting base has the freedom to move toward or away from the communicating hole; A cyclic motion structure is disposed within the receiving cavity and mounted on the mounting base; the cyclic motion structure has a motion mounting surface disposed near the communicating hole, and the motion mounting surface has a degree of freedom to cyclically move along the length direction of the communicating hole; A heating knife is mounted on the moving mounting surface, and the blade of the heating knife passes through the connecting hole and is located outside the heating block; A pusher, installed in the receiving cavity, with one end connected to the mounting base, is used to drive the mounting base to move toward or away from the communicating hole; The cyclic motion structure includes: Four support rods are arranged in a rectangular array on the mounting base; There are four sprockets, each mounted on one of the four support rods and rotatably connected to the support rods; A chain is meshed with four sprockets; the motion mounting surface is located on the outer surface of the chain. A drive motor is mounted on the mounting base and connected to one of the sprockets; The heating blade structure is multiple and is evenly arranged on the moving mounting surface.

2. The method for cleaning deposits on the inner wall of oil pipe fittings as described in claim 1, characterized in that, The loosening holes are arranged in a rectangular array, and the diameter of the loosening holes is 8-12mm, with the axial distance between two adjacent loosening holes being 20-28mm; the depth of the loosening holes is one-tenth to one-ninth of the thickness of the attached material.

3. The method for cleaning deposits on the inner wall of oil pipe fittings as described in claim 2, characterized in that, The loosening holes in two adjacent S2s are staggered along the thickness direction of the attached material.

4. The method for cleaning deposits on the inner wall of oil pipe fittings as described in claim 1, characterized in that, The bottom of the heating block is provided with a rotating operating plate. The operating plate is provided with a heating protrusion for contacting the attached object to form a groove. A radial force is applied to the heating block, and the operating plate is rotated to make the heating protrusion enter the bottom surface of the annular recess until the heating blade contacts and aligns with the bottom surface of the annular recess. The height of the heating protrusion is less than or equal to 0.3 mm.

5. The method for cleaning deposits on the inner wall of oil pipe fittings as described in claim 4, characterized in that, After the last scraping of the attachment by the cutting blade, the heating convex at the bottom of the heating block acts on the bottom surface of the annular recess for an extended period of time, the high-pressure water jet acts on the inner wall of the groove, and the radial dimension of the high-pressure water jet is less than one-tenth to one-fifth of the radial dimension of the groove.

6. A device for cleaning deposits on the inner wall of oil pipe fittings, characterized in that, The method for cleaning deposits on the inner wall of oil pipe fittings as described in any one of claims 1-5 further includes: The working chamber has an inlet at the top and an inlet hole on one side; the oil pipe enters the working chamber through the inlet, and the oil pipe is arranged coaxially with the inlet hole. The main support shaft includes multiple hollow pipe segments arranged at intervals, and the multiple hollow pipe segments are fixedly connected and arranged coaxially. Multiple rotating shafts are installed between two adjacent hollow pipe sections; the two ends of each rotating shaft are slidably connected to the two hollow pipe sections and have the freedom to reciprocate along the axial direction of the main support shaft. The cleaning device comprises multiple units, each mounted on one of the rotating shafts. Each cleaning device includes three linear actuators spaced apart along the length of the rotating shafts. The cutting blade, the heating block, and the water pipe for generating high-pressure water jets are respectively mounted on the three linear actuators.

7. The oil pipe fitting inner wall attachment cleaning equipment as described in claim 6, characterized in that, The linear actuator for mounting the water pipe is provided with a connecting shaft, the connecting shaft is rotatably connected to the linear actuator, and the water pipe is mounted on the connecting shaft.

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