Oil pipe inner cavity protection device

Abstract

The invention relates to the technical field of oil pipe protection, and discloses an oil pipe inner cavity protection device which comprises a bottom mounting frame, a limiting plate and a supporting plate, the limiting plate and the supporting plate are fixedly mounted on the bottom mounting frame, the section of the limiting plate is of a semi-C-shaped structure, a first bearing is fixedly mounted on the outer surface of the limiting plate, and a rotating disc is rotationally mounted on the face, away from the limiting plate, of the first bearing. A rotating motor is fixedly installed on the face, away from the first bearing, of the rotating disc. The oil pipe inner cavity protection device integrates multiple functions of heating, smoothing, cleaning and the like, comprehensive inner cavity protection treatment can be conducted on an oil pipe body, operation related to arrangement of a heat shrinkable sleeve of a new oil pipe and operation such as cleaning and repairing of an old oil pipe can be efficiently completed in the device, the quality of the oil pipe is effectively improved, the service life of the oil pipe is effectively prolonged, and the oil pipe inner cavity protection device is suitable for popularization and application. Faults caused by inner cavity problems (such as corrosion, abrasion and the like) in the using process of the oil pipe are reduced, and stable operation of the oil pipe in the processes of oil exploitation, transportation and the like is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipe protection, in particular to an oil pipe inner cavity protection device. Background Art

[0002] Oil pipes play a vital role in the process of oil extraction, transportation and processing. Oil pipes usually need to withstand high pressure, high temperature and corrosion of various complex chemicals for a long time. In oil well mining, downhole oil pipes have to withstand huge pressure from deep in the formation, as well as corrosive components contained in crude oil such as hydrogen sulfide and carbon dioxide. According to statistics, in some high-sulfur oil wells, the damage rate of oil pipes due to corrosion can be as high as 10%-20% per year. These damages will not only cause crude oil leakage and cause environmental pollution, but also lead to the interruption of oil extraction and transportation, causing huge economic losses.

[0003] On the one hand, new oil extraction technologies, such as high-temperature and high-pressure oil reservoir extraction and heavy oil extraction, have made the inner cavity of the oil pipe face a more severe working environment. For example, in heavy oil extraction, due to the high viscosity of heavy oil, it will produce greater friction on the pipe wall when flowing in the oil pipe, accelerating the wear of the pipe wall. On the other hand, the improvement of environmental protection requirements has also prompted people to pay more attention to the protection of the inner cavity of the oil pipe. Once the inner cavity of the oil pipe leaks, crude oil and other harmful substances will directly enter the environment, causing serious pollution to the soil, water sources, etc.

[0004] The Chinese invention patent announcement number: CN114231991B, discloses: a cathodic protection device for protecting the inner wall of an oil pipe and a casing, wherein the cathodic protection device for protecting the inner wall of an oil pipe and a casing is inflated into an air bag, so that the sacrificial anode in the pipe can be expanded and abutted against the inner wall of an annular inner groove; at this time, the plug-in column abuts against the sacrificial anode in the pipe, and as the sacrificial anode in the pipe is expanded, under the pressure of the air bag, the first protrusion and the second protrusion are finally interlocked and abutted, and the plug-in column is inserted into the slot, and the protrusion is installed in the arc groove; under the cooperation of the plug-in column, the slot, the protrusion, the arc groove, and the annular inner groove, The sacrificial anode in the pipe can be stably installed in the annular inner groove, which is simple, fast and stable. However, the cathodic protection device for protecting the inner wall of the oil pipe and casing does not integrate multiple functions such as heating, smoothing and cleaning. When processing the old pipeline, it is easy to use other cleaning equipment for cleaning, and then lay it again, resulting in poor diversity of the overall device. In addition, no smoothing structure is designed, which is not convenient for smoothing the inner wall of the oil pipe body and dealing with the uneven inner wall of the oil pipe. The smoothing effect cannot be guaranteed, so that protective materials such as heat shrink sleeves cannot fit the inner wall of the oil pipe better, and the practicality is poor. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an oil pipe inner cavity protection device, which can effectively solve the problem that the prior art does not integrate multiple functions such as heating, smoothing, and cleaning. When processing old pipes, other cleaning equipment is easily used for cleaning, and then the pipes are laid again, resulting in poor diversity of the overall device. In addition, no smoothing structure is designed, which makes it inconvenient to smooth the inner wall of the oil pipe body and deal with the unevenness of the inner wall of the oil pipe. The smoothing effect cannot be guaranteed, so that protective materials such as heat shrink sleeves cannot better fit the inner wall of the oil pipe, resulting in poor practicality.

[0006] The technical solution adopted by the present invention is: a device for protecting the inner cavity of an oil pipe, comprising a bottom mounting frame, and a limit plate and a support plate fixedly mounted on the bottom mounting frame with a semi-C-shaped cross-section, a bearing 1 being fixedly mounted on the outer surface of the limit plate, a turntable being rotatably mounted on a side of the bearing 1 away from the limit plate, a rotating motor being fixedly mounted on a side of the turntable away from the bearing 1, a heating component, a smoothing component and a cleaning component being fixedly mounted on a side of the turntable away from the rotating motor, a limit plate being fixedly mounted on the other end of the heating component, the smoothing component and the cleaning component away from the rotating motor, a translation component being fixedly mounted on the other end of the support plate away from the bottom mounting frame, an oil pipe body being arranged on the other end of the translation component away from the bottom mounting frame, a processing cavity being fixedly mounted on a side of the limit plate away from the mounting and a side of the bearing 1 away from the rotating motor, a support seat adapted for the translation component being fixedly mounted on the inner surface of the processing cavity.

[0007] Preferably, the translation assembly includes a base at the other end of the bottom mounting frame away from the limit plate, a translation motor is fixedly mounted on the outer surface of the base, a translation screw is fixedly mounted on the output shaft of the translation motor, a translation guide column is fixedly mounted on the end of the base close to the bottom mounting frame, a threaded block is threadedly connected to the outer surface of the translation screw, a sliding block is slidably connected to the outer surface of the translation guide column, a mounting plate is fixedly mounted on the other end of the threaded block and the sliding block away from the translation guide column, and the other end of the translation screw and the translation guide column away from the bottom mounting frame is adapted to the support seat.

[0008] Through the above technical solution, after the oil pipe body is fixed, the translation motor can be started, and the translation motor drives the translation screw to rotate. Since the threaded block is threadedly connected to the translation screw, when the translation screw rotates, the threaded block will move along the translation screw. At the same time, the sliding block on the translation guide column will slide synchronously with the movement of the threaded block to ensure the smoothness of movement. The mounting plate moves with the threaded block and the sliding block. When the translation screw and the translation guide column move to the support seat, the old oil pipe can be cleaned or the new oil pipe can be smoothed, heated and smoothed again. The translation movement of the mounting plate can be accurately controlled to adjust the position of the oil pipe body.

[0009] Preferably, a limit seat is fixedly installed on the other end of the mounting plate away from the translation guide column, a second rotating column is rotatably installed on the inner surface of the limit seat, and a limit sleeve adapted to the oil pipe body is fixedly installed on the other end of the second rotating column away from the limit seat.

[0010] Through the above technical solution, when in use, the oil pipe body can be placed in the limit sleeve first, and the limit sleeve can be rotated in the limit seat through the rotating column 2, so that the limit sleeve fits the oil pipe body, and then the screw is passed through the limit sleeve to limit the oil pipe body, which can avoid the oil pipe body from being easily displaced in the subsequent out process.

[0011] Preferably, the cleaning component includes a third mounting bracket and a cleaning frame fixedly mounted on the other three ends of the turntable away from the rotating motor, a third mounting plate fixedly mounted on the other three ends of the third mounting bracket away from the turntable, a cleaning movable motor fixedly mounted on the three ends of the third mounting bracket close to the third mounting bracket, a third screw rod fixedly mounted on the output shaft of the cleaning movable motor, a third guide rod fixedly mounted on the other three ends of the third mounting bracket away from the third mounting bracket, a fixed disc threadedly connected to the third guide rod on the outer surface of the third screw rod and slidably connected to the third guide rod, a connecting block is provided on the outer surface of the fixed disc, one end of the connecting block is located on the outer surface of the cleaning frame and the other end extends to the outer surface of the fixed disc and a connecting disc 2 is provided.

[0012] Through the above technical scheme, when cleaning, the turntable can be driven to rotate by rotating the motor first, and the design of the upper bearing can make the turntable rotate, and then the cleaning component and the oil pipe body are located on the same horizontal line. At this time, the third screw rod is located inside the oil pipe body, and then the other end of the third screw rod is connected through the positioning plate, and then the cleaning moving motor is started. The cleaning moving motor drives the third screw rod to rotate, which can make the fixed plate move on the third screw rod threadably and slide along the third guide rod at the same time to ensure the accuracy of the moving direction.

[0013] Preferably, the outer surface of the second connecting plate is provided with a cleaning frame adapted to the connecting block, the inner surface of the cleaning frame is provided with a groove, a cleaning knife is inserted and installed on the inner surface of the groove, and the outer surface of the cleaning frame is provided with a mounting bolt that passes through the cleaning frame and the cleaning knife and extends to its outer surface.

[0014] Through the above technical solution, the connection block moves with the fixed disk, driving the cleaning frame to move. When the cleaning knife needs to be replaced, the installation bolt is pulled out, the old cleaning knife is taken out from the groove, the new cleaning knife is inserted, and the installation bolt is inserted to fix it, so that the cleaning knife can clean the inner wall of the old oil pipe body, and can cover different positions of the inner wall of the oil pipe body to improve the cleaning effect. The replaceable design of the cleaning knife facilitates the maintenance and update of the tool, ensures the long-term effective work of the cleaning component, extends its service life, effectively removes dirt, impurities, etc. on the inner wall of the old oil pipe body, and then the heat shrink sleeve is fitted again to extend the service life of the old oil pipe.

[0015] Preferably, a heat shrink sleeve is provided on the inner wall of the oil pipe body, and the heat shrink sleeve is made of one of polyolefin, fluororubber and ethylene-vinyl acetate copolymer.

[0016] Through the above technical scheme, when the heat shrink sleeve is made of polyolefin material, its good flexibility and chemical corrosion resistance can be used to effectively prevent the oil pipe body from contacting the internal corrosive fluid and resist the erosion of corrosive substances such as hydrogen sulfide and carbon dioxide in crude oil. The heat shrink sleeve made of fluororubber can work in the oil well environment with high temperature, high pressure and complex chemical environment, withstand high temperature, have good tolerance to chemical substances in crude oil, and can also play a sealing role to prevent crude oil leakage. The heat shrink sleeve made of ethylene-vinyl acetate copolymer can use its water resistance to isolate moisture and protect the oil pipe body in a humid environment or during the transportation of crude oil containing a large amount of water, thereby extending the service life of the oil pipe body and reducing maintenance costs.

[0017] Preferably, the smoothing assembly includes a second mounting frame fixedly mounted on the other two ends of the turntable away from the rotating motor, a second mounting plate fixedly mounted on the other two ends of the second mounting frame away from the turntable, a smoothing movable motor fixedly mounted on the two ends of the second mounting plate close to the second mounting frame, a second screw rod fixedly mounted on the output shaft of the smoothing movable motor, a second guide rod fixedly mounted on the other end of the second mounting plate away from the second mounting frame, and the outer surface of the second screw rod is threadedly connected to a rotating disk 1 and a rotating disk 2 which are slidably connected to the second guide rod.

[0018] Through the above technical scheme, after the old oil pipe is cleaned or the heat shrink sleeve of the new oil pipe is laid, the translation component is started again to make the oil pipe body withdraw from the processing cavity 19, and the turntable is rotated again to make the smoothing component and the oil pipe body be on the same horizontal line, and the cleaning operation is repeated again. Then, the smoothing moving motor can be used to drive the second screw rod to rotate, and the rotating disk one and the rotating disk two move threadedly on the second screw rod and slide along the second guide rod at the same time, so that the smoothing moving motor, the second screw rod and the second guide rod can accurately control the position of the smoothing roller so that it can fully cover the inner wall of the oil pipe body.

[0019] Preferably, a connecting rod connected to the rotating disk 2 is fixedly installed on the outer surface of the rotating disk 1, a rotating column 1 is rotatably installed on the inner surface of the connecting rod, a telescopic rod is fixedly installed on the outer surface of the rotating column 1, a smoothing roller is rotatably installed on the outer surface of the rotating column 1, and a connecting column connected to another rotating disk 2 is fixedly installed on the outer surface of the rotating disk 2. A plurality of connecting rods, rotating column 1, telescopic rods and smoothing rollers are arranged in a circular distribution about the center line of the rotating disk 1, and the rotating disk 1 and the rotating disk 2 at both ends of the connecting column are staggered.

[0020] Through the above technical scheme, the rotating disk 1 and the rotating disk 2 connected by the connecting rod move synchronously, the rotating column 1 rotates in the connecting rod, the telescopic rod can be extended and retracted according to the inner wall of the oil pipe body, and the smoothing roller rotates on the rotating column 1 to smooth the inner wall of the oil pipe body. Multiple connecting rods, rotating column 1, telescopic rods and smoothing rollers distributed in a ring can smooth the inner wall of the oil pipe body at the same time, thereby improving work efficiency. The design of the telescopic rod can adapt to the unevenness of the inner wall of the oil pipe body and ensure the smoothing effect. It can make protective materials such as heat shrink sleeves better fit the inner wall of the oil pipe body, improve the protection effect, and reduce the erosion and corrosion of the oil pipe body by the internal fluid.

[0021] Preferably, the heating assembly includes a first mounting frame fixedly mounted on the other end of the turntable away from the rotating motor, a first mounting plate fixedly mounted on the other end of the first mounting frame away from the turntable, a heating movable motor fixedly mounted on one end of the first mounting plate close to the first mounting frame, a first screw rod fixedly mounted on the output shaft of the heating movable motor, a first guide rod fixedly mounted on the other end of the first mounting plate away from the first mounting frame, two connecting plates 1 that are slidably connected to the first guide rod are threadedly connected to the outer surface of the first screw rod, a connecting plate and a power supply body are fixedly mounted between the two connecting plates 1, a limit frame is fixedly mounted on the outer surface of the connecting plate, a heating tube distributed in an inverted "S" shape is fixedly mounted on the inner surface of the limit frame, a protective frame is fixedly mounted on the other end of the limit frame away from the heating tube, and the power supply body is electrically connected to the heating tube.

[0022] Through the above technical scheme, when smoothing is completed, the operation of the smoothing component can be repeated. After the oil pipe body is withdrawn, the turntable connecting the positioning plate is rotated, and then the heating moving motor is started. The heating moving motor drives the first screw rod to rotate, and the two connecting disks move threadedly on the first screw rod and slide along the first guide rod at the same time. The connecting plate and the power supply body move with the connecting disk, and the heating tube in the limit frame also moves accordingly. The power supply body supplies power to the heating tube, the heating tube generates heat, and the oil pipe body is heated. The protective frame protects the heating tube. The cooperation of the heating moving motor, the first screw rod and the first guide rod can accurately control the position of the heating tube, so that it can accurately heat the part of the oil pipe body that needs to be heated. This movable heating method can meet the heating requirements of different lengths or different positions, improve the flexibility and efficiency of heating, and the heating tube distributed in an inverted "S" shape can increase the heating area and make the heating more uniform. The protective frame can protect the heating tube from external factors, extend the service life of the heating tube, and ensure the safety and stability of the heating operation.

[0023] Preferably, the outer surface of the limit plate is penetrated by a plurality of positioning bolts 1 distributed in a ring shape with respect to the limit plate, a bearing 2 is rotatably mounted on the outer surface of the limit plate, a positioning plate is provided on a side of the bearing 2 and the limit plate away from the rotating motor, a positioning plate is penetrated by a side of the positioning plate away from the limit plate with positioning bolts 2 extending to the inside of the limit plate and positioning bolts 3 extending to the inside of the bearing 2, and the positioning bolts 1 correspond one to one with the oil pipe body.

[0024] Through the above technical solution, the limit plate and the oil pipe body are connected correspondingly using positioning bolt 1 to ensure that the relative positions of the two are fixed, the positioning plate and the limit plate are fixed by positioning bolt 2, and the positioning plate and the bearing 2 are fixed by positioning bolt 3, so that the whole structure is more stable. Bearing 2 can ensure the rotation flexibility of the limit plate when needed.

[0025] Compared with the prior art, the present invention provides a device for protecting the inner cavity of an oil pipe, which has the following beneficial effects:

[0026] 1. The oil pipe inner cavity protection device integrates multiple functions such as heating, smoothing, and cleaning, and can perform comprehensive inner cavity protection treatment on the oil pipe body. Whether it is the related operation of laying the heat shrink sleeve of the new oil pipe, or the cleaning and repair of the old oil pipe, it can be efficiently completed in this device, effectively improving the quality and service life of the oil pipe, reducing the failure of the oil pipe caused by inner cavity problems (such as corrosion, wear, etc.) during use, and ensuring the stable operation of the oil pipe during oil extraction and transportation;

[0027] 2. The cleaning assembly of the oil pipe inner cavity protection device is aligned with the oil pipe body through a rotatable turntable. The cleaning moving motor drives the third screw rod to rotate, so that the cleaning knife can move and clean the inner wall of the oil pipe body. The replaceable design of the cleaning knife is convenient for maintenance and updating, and can effectively remove dirt and impurities on the inner wall of the old oil pipe, improve the cleaning effect, create good conditions for subsequent operations (such as heat shrink sleeve lamination), and help to increase the service life of the old oil pipe;

[0028] 3. The smoothing component of the oil pipe inner cavity protection device works after the old oil pipe is cleaned or the heat shrink sleeve of the new oil pipe is laid. Through the cooperation of the smoothing moving motor, the second screw rod, the second guide rod, etc., multiple annularly distributed smoothing components can smooth the inner wall of the oil pipe body at the same time, thereby improving work efficiency. The telescopic rod can adapt to the uneven inner wall of the oil pipe, ensure the smoothing effect, make the heat shrink sleeve and other protective materials better fit the inner wall of the oil pipe, and reduce the scouring and corrosion of the internal fluid on the oil pipe;

[0029] 4. The oil pipe inner cavity protection device, the heating component can heat the oil pipe body after the smoothing operation, the heating moving motor drives the first screw to rotate, realizes the precise movement of the heating pipe, meets the heating requirements of different lengths and positions, improves the heating flexibility and efficiency, and the heating pipe with an inverted "S" shape distribution increases the heating area, makes the heating more uniform, and the protective frame protects the heating pipe, prolongs its service life, ensures the safety and stability of the heating operation, and is helpful for the shrinkage and fitting of the new oil pipe heat shrink sleeve and the treatment of the old oil pipe after repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0031] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0032] Figure 3 The three-dimensional structure of the present invention is shown in FIG. Figure 3 ;

[0033] Figure 4 It is a schematic diagram of the three-dimensional structure of the heating component of the present invention;

[0034] Figure 5 This is a schematic diagram of the installation structure of the limit plate and the positioning bolt of the present invention;

[0035] Figure 6 Schematic diagram of the split structure of the heating component of the present invention Figure 1 ;

[0036] Figure 7 Schematic diagram of the split structure of the heating component of the present invention Figure 2 ;

[0037] Figure 8 This is a schematic diagram of the three-dimensional structure of the smoothing component of the present invention;

[0038] Fig. 9 This is a schematic diagram of the disassembled structure of the smoothing component of the present invention;

[0039] Fig.10 This is a schematic diagram of the three-dimensional structure of the cleaning component of the present invention;

[0040] Fig.11 This is a schematic diagram of the disassembly structure of the cleaning component of the present invention;

[0041] Fig.12 The three-dimensional structure of the translation assembly of the present invention is shown in FIG. Figure 1 ;

[0042] Fig.13 The three-dimensional structure of the translation assembly of the present invention is shown in FIG. Figure 2 .

[0043] Among them: 1. Bottom mounting frame; 2. Limiting plate; 3. Bearing 1; 4. Turntable; 5. Rotating motor; 6. Heating assembly; 601. First mounting frame; 602. First mounting plate; 603. Heating moving motor; 604. First screw rod; 605. First guide rod; 606. Connecting plate 1; 607. Connecting plate; 608. Limiting frame; 609. Heating tube; 610. Protective frame; 611. Power supply body; 7. Limiting plate; 8, positioning bolt 1; 9, bearing 2; 10, positioning plate; 11, positioning bolt 2; 12, positioning bolt 3; 13, smoothing assembly; 1301, second mounting frame; 1302, second mounting plate; 1303, smoothing moving motor; 1304, second screw rod; 1305, second guide rod; 1306, rotating plate 1; 1307, connecting rod; 1308, rotating plate 2; 1309, rotating column 1; 131 0, telescopic rod; 1311, smoothing roller; 1312, connecting column; 14, cleaning assembly; 1401, third mounting frame; 1402, third mounting plate; 1403, cleaning moving motor; 1404, third screw rod; 1405, third guide rod; 1406, fixed plate; 1407, connecting block; 1408, connecting plate 2; 1409, cleaning frame; 1410, groove; 1411, cleaning knife; 141 2. Mounting bolt; 15. Support plate; 16. Translation assembly; 1601. Base; 1602. Translation motor; 1603. Translation screw rod; 1604. Translation guide column; 1605. Threaded block; 1606. Sliding block; 1607. Mounting plate; 1608. Limit seat; 1609. Rotating column 2; 1610. Limit sleeve; 17. Oil pipe body; 18. Heat shrink sleeve; 19. Processing cavity; 20. Support seat. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Embodiment 1: Figure 1-13 As shown, a tubing inner cavity protection device provided by the present invention comprises a bottom mounting frame 1, and a limit plate 2 and a support plate 15 fixedly mounted on the bottom mounting frame 1 and having a semi-C-shaped cross-section, a bearing 3 fixedly mounted on the outer surface of the limit plate 2, a turntable 4 is rotatably mounted on a side of the bearing 3 away from the limit plate 2, a rotating motor 5 is fixedly mounted on a side of the turntable 4 away from the bearing 3, a heating component 6, a smoothing component 13 and a cleaning component 14 are fixedly mounted on a side of the turntable 4 away from the rotating motor 5, and a limit plate 7 is fixedly mounted on the other end of the heating component 6, the smoothing component 13 and the cleaning component 14 away from the rotating motor 5, a translation component 16 is fixedly mounted on the other end of the support plate 15 away from the bottom mounting frame 1, and an oil pipe body 17 is arranged on the other end of the translation component 16 away from the bottom mounting frame 1, a processing cavity 19 is fixedly mounted on a side of the limit plate 2 away from the mounting and a side of the bearing 3 away from the rotating motor 5, and a support seat 20 adapted to the translation component 16 is fixedly mounted on the inner surface of the processing cavity 19.

[0046] Specifically, the translation assembly 16 includes a base 1601 at the other end of the bottom mounting frame 1 away from the limit plate 2, a translation motor 1602 is fixedly installed on the outer surface of the base 1601, a translation screw 1603 is fixedly installed on the output shaft of the translation motor 1602, a translation guide column 1604 is fixedly installed on the end of the base 1601 close to the bottom mounting frame 1, a threaded block 1605 is threadedly connected to the outer surface of the translation screw 1603, a sliding block 1606 is slidably connected to the outer surface of the translation guide column 1604, a mounting plate 1607 is fixedly installed on the other end of the threaded block 1605 and the sliding block 1606 away from the translation guide column 1604, and the other end of the translation screw 1603 and the translation guide column 1604 away from the bottom mounting frame 1 is adapted to the support seat 20, which has the advantage that the oil pipe body 17 is fixed After completion, the translation motor 1602 can be started, and the translation motor 1602 drives the translation screw 1603 to rotate. Since the threaded block 1605 is threadedly connected to the translation screw 1603, when the translation screw 1603 rotates, the threaded block 1605 will move along the translation screw 1603. At the same time, the sliding block 1606 on the translation guide column 1604 will slide synchronously with the movement of the threaded block 1605 to ensure the smoothness of the movement. The mounting plate 1607 moves with the threaded block 1605 and the sliding block 1606. When the translation screw 1603 and the translation guide column 1604 move to the support seat 20, the old oil pipe can be cleaned or the new oil pipe can be smoothed, heated and smoothed again. The translation movement of the mounting plate 1607 can be accurately controlled to adjust the position of the oil pipe body 17.

[0047] Specifically, a limiting seat 1608 is fixedly installed on the other end of the mounting plate 1607 away from the translation guide column 1604, and a rotating column 1609 is rotatably installed on the inner surface of the limiting seat 1608. A limiting sleeve 1610 adapted to the oil pipe body 17 is fixedly installed on the other end of the rotating column 1609 away from the limiting seat 1608. The advantage is that when in use, the oil pipe body 17 can be placed in the limiting sleeve 1610 first, and the limiting sleeve 1610 is rotated in the limiting seat 1608 through the rotating column 1609, so that the limiting sleeve 1610 fits the oil pipe body 17, and then the limiting sleeve 1610 is passed through the screw to limit the oil pipe body 17, which can prevent the oil pipe body 17 from being easily displaced during the subsequent out-coming process.

[0048] Specifically, the cleaning assembly 14 includes a third mounting frame 1401 and a cleaning frame 1409 fixedly mounted on the other three ends of the turntable 4 away from the rotating motor 5, a third mounting plate 1402 fixedly mounted on the other three ends of the third mounting plate 1401 away from the turntable 4, a cleaning moving motor 1403 fixedly mounted on the three ends of the third mounting plate 1402 close to the third mounting frame 1401, a third screw rod 1404 fixedly mounted on the output shaft of the cleaning moving motor 1403, a third guide rod 1405 fixedly mounted on the other three ends of the third mounting plate 1402 away from the third mounting frame 1401, a fixed plate 1406 slidably connected to the third guide rod 1405 is threadedly connected to the outer surface of the third screw rod 1404, and a connecting block 1407 is arranged on the outer surface of the fixed plate 1406, and one end of the connecting block 1407 is located at A connecting disk 2 1408 is provided on the outer surface of the cleaning frame 1409 and the other end extends to the outer surface of the fixed disk 1406. The advantage is that when cleaning, the turntable 4 can be driven to rotate by the rotating motor 5. With the design of the upper bearing 1 3, the turntable 4 can be rotated, and then the cleaning component 14 and the oil pipe body 17 are located on the same horizontal line. At this time, the third screw rod 1404 is located inside the oil pipe body 17, and then the other end of the third screw rod 1404 is connected through the positioning plate 10, and then the cleaning moving motor 1403 is started. The cleaning moving motor 1403 drives the third screw rod 1404 to rotate, so that the fixed disk 1406 can move on the third screw rod 1404 threadedly and slide along the third guide rod 1405 at the same time to ensure the accuracy of the moving direction.

[0049] Embodiment 2: Figure 2-13 As shown, as an improvement to the previous embodiment.

[0050] Specifically, the outer surface of the connecting plate 1408 is provided with a cleaning frame 1409 adapted to the connecting block 1407, the inner surface of the cleaning frame 1409 is provided with a groove 1410, and the inner surface of the groove 1410 is plugged and installed with a cleaning knife 1411, and the outer surface of the cleaning frame 1409 is provided with a mounting bolt 1412 that penetrates the cleaning frame 1409 and the cleaning knife 1411 and extends to its outer surface. The advantage is that the cleaning frame 1409 is driven to move by the connecting block 1407 moving with the fixed plate 1406. When the cleaning knife 1411 needs to be replaced, the mounting bolt 1412 is pulled out and the old cleaning knife 1411 is replaced. The knife 1411 is taken out from the groove 1410, and a new cleaning knife 1411 is inserted, and then the mounting bolt 1412 is inserted to fix it, so that the cleaning knife 1411 can clean the inner wall of the old oil pipe body 17, and can cover different positions of the inner wall of the oil pipe body 17 to improve the cleaning effect. The replaceable design of the cleaning knife 1411 facilitates the maintenance and updating of the knife, ensures the long-term and effective operation of the cleaning component 14, extends its service life, and effectively removes dirt, impurities, etc. on the inner wall of the old oil pipe body 17. Subsequently, the heat shrink sleeve 18 is fitted again to increase the service life of the old oil pipe.

[0051] Specifically, a heat shrink sleeve 18 is provided on the inner wall of the oil pipe body 17. The heat shrink sleeve 18 is made of one of polyolefin, fluororubber and ethylene-vinyl acetate copolymer EVA. The advantage is that when the heat shrink sleeve 18 is made of polyolefin, its good flexibility and chemical corrosion resistance can be used to effectively prevent the oil pipe body 17 from contacting the internal corrosive fluid and resist the erosion of corrosive substances such as hydrogen sulfide and carbon dioxide in crude oil. The heat shrink sleeve 18 made of fluororubber can work in an oil well environment with high temperature, high pressure and complex chemical environment, withstand high temperature, have good tolerance to chemical substances in crude oil, and can also play a sealing role to prevent crude oil leakage. The heat shrink sleeve 18 made of ethylene-vinyl acetate copolymer EVA can use its water resistance to isolate moisture and protect the oil pipe body 17 in a humid environment or during the transportation of crude oil containing a large amount of water, thereby extending the service life of the oil pipe body 17 and reducing maintenance costs.

[0052] Specifically, the smoothing component 13 includes a second mounting bracket 1301 fixedly mounted on the other end of the turntable 4 away from the rotating motor 5, a second mounting plate 1302 fixedly mounted on the other end of the second mounting plate 1301 away from the turntable 4, a smoothing moving motor 1303 fixedly mounted on the two ends of the second mounting plate 1302 close to the second mounting bracket 1301, a second screw rod 1304 fixedly mounted on the output shaft of the smoothing moving motor 1303, a second guide rod 1305 fixedly mounted on the other two ends of the second mounting plate 1302 away from the second mounting bracket 1301, and a rotating disk 1 1306 and a rotating disk 2 1308 threadedly connected to the second guide rod 1305 on the outer surface of the second screw rod 1304. The advantage is that when the old oil pipe is cleaned After that, or after the new oil pipe heat shrink sleeve 18 is laid, first start the translation component 16 again to make the oil pipe body 17 withdraw from the processing cavity 19, rotate the turntable 4 again to make the smoothing component 13 and the oil pipe body 17 be on the same horizontal line, repeat the cleaning operation again, and then cooperate with the smoothing moving motor 1303, the smoothing moving motor 1303 drives the second screw rod 1304 to rotate, the rotating disk 1 1306 and the rotating disk 2 1308 move threadedly on the second screw rod 1304, and slide along the second guide rod 1305 at the same time, so that the smoothing moving motor 1303, the second screw rod 1304 and the second guide rod 1305 can accurately control the position of the smoothing roller 1311, so that it can fully cover the inner wall of the oil pipe body 17.

[0053] Embodiment 3: Figure 2-13 As shown, as an improvement to the previous embodiment.

[0054] Specifically, a connecting rod 1307 connected to the rotating disk 2 1308 is fixedly installed on the outer surface of the rotating disk 1306, a rotating column 1309 is rotatably installed on the inner surface of the connecting rod 1307, a telescopic rod 1310 is fixedly installed on the outer surface of the rotating column 1309, a smoothing roller 1311 is rotatably installed on the outer surface of the rotating column 1309, and a connecting column 1312 connected to another rotating disk 2 1308 is fixedly installed on the outer surface of the rotating disk 2 1308. The connecting rod 1307, the rotating column 1309, the telescopic rod 1310 and the smoothing roller 1311 are arranged in a plurality of annular distributions about the center line of the rotating disk 1306, and the rotating disks 1306 and the rotating disks 2 1308 at both ends of the connecting column 1312 are staggered. The advantage is that the rotating disks 1306 and the rotating disks 2 1308 connected by the connecting rod 1307 are The rotating disk 1306 and the rotating disk 2 1308 move synchronously, the rotating column 1309 rotates in the connecting rod 1307, the telescopic rod 1310 can be extended and retracted according to the inner wall of the oil pipe body 17, and the smoothing roller 1311 rotates on the rotating column 1309 to smooth the inner wall of the oil pipe body 17. A plurality of connecting rods 1307, rotating column 1309, telescopic rod 1310 and smoothing roller 1311 distributed in a ring can smooth the inner wall of the oil pipe body 17 at the same time, thereby improving work efficiency. The design of the telescopic rod 1310 can adapt to the unevenness of the inner wall of the oil pipe body 17, ensure the smoothing effect, and enable protective materials such as the heat shrink sleeve 18 to better fit the inner wall of the oil pipe body 17, thereby improving the protection effect and reducing the scouring and corrosion of the oil pipe body 17 by the internal fluid.

[0055] Specifically, the heating assembly 6 includes a first mounting bracket 601 fixedly mounted on the other end of the turntable 4 away from the rotating motor 5, a first mounting plate 602 fixedly mounted on the other end of the first mounting plate 601 away from the turntable 4, a heating moving motor 603 fixedly mounted on one end of the first mounting plate 602 close to the first mounting bracket 601, a first screw rod 604 fixedly mounted on the output shaft of the heating moving motor 603, a first guide rod 605 fixedly mounted on the other end of the first mounting plate 602 away from the first mounting bracket 601, and an outer surface of the first screw rod 604 is threadedly connected to the first guide rod 605. The two connecting plates 606 are connected in a sliding manner, and a connecting plate 607 and a power source body 611 are fixedly installed between the two connecting plates 606. A limit frame 608 is fixedly installed on the outer surface of the connecting plate 607, and a heating tube 609 distributed in an inverted "S" shape is fixedly installed on the inner surface of the limit frame 608. A protective frame 610 is fixedly installed on the other end of the limit frame 608 away from the heating tube 609. The power source body 611 is electrically connected to the heating tube 609. The advantage is that after the smoothing is completed, the operation of the smoothing component 13 can be repeated, and the oil pipe body 17 can be withdrawn and then the turntable 4 is rotated to connect the positioning plate 10, then start the heating moving motor 603, the heating moving motor 603 drives the first screw rod 604 to rotate, the two connecting plates 606 move on the first screw rod 604, and slide along the first guide rod 605, the connecting plate 607 and the power supply body 611 move with the connecting plate 606, and the heating tube 609 in the limit frame 608 also moves accordingly, the power supply body 611 supplies power to the heating tube 609, the heating tube 609 generates heat, and the oil pipe body 17 is heated, and the protective frame 610 protects the heating tube 609, and the heating moving motor 603, The cooperation between the first screw rod 604 and the first guide rod 605 can accurately control the position of the heating tube 609, so that it can accurately heat the part of the oil pipe body 17 that needs to be heated. This movable heating method can meet the heating requirements of different lengths or different positions, improve the flexibility and efficiency of heating, and the heating tube 609 with an inverted "S" shape can increase the heating area and make the heating more uniform. The protective frame 610 can protect the heating tube 609 from external factors such as collision, oil pollution, etc., extend the service life of the heating tube 609, and ensure the safety and stability of the heating operation.

[0056] Specifically, a plurality of positioning bolts 8 are provided on the outer surface of the limit plate 7 in a ring-shaped distribution about the limit plate 7, a bearing 2 9 is rotatably installed on the outer surface of the limit plate 7, a positioning plate 10 is provided on the side of the bearing 2 9 and the limit plate 7 away from the rotating motor 5, a positioning bolt 2 11 extending to the inside of the limit plate 7 and a positioning bolt 3 12 extending to the inside of the bearing 2 9 are provided on the side of the positioning plate 10 away from the limit plate 7, and the positioning bolts 8 correspond to the oil pipe body 17 one by one. The advantage is that the positioning bolts 8 are used to connect the limit plate 7 and the oil pipe body 17 accordingly to ensure that the relative positions of the two are fixed, the positioning bolts 11 are used to fix the positioning plate 10 to the limit plate 7, and the positioning bolts 3 12 are used to fix the positioning plate 10 to the bearing 2 9, so that the whole structure is more stable, and the bearing 2 9 can ensure the rotation flexibility of the limit plate 7 when needed.

[0057] Working principle: when in use, place the oil pipe body 17 in the limiting sleeve 1610 of the translation assembly 16. At this time, the limiting sleeve 1610 will rotate in the limiting seat 1608 through the rotating column 1609, so as to fit tightly to the oil pipe body 17. Then, use a screw to pass through the limiting sleeve 1610 to achieve effective limitation of the oil pipe body 17 to avoid unnecessary displacement of the oil pipe body 17 during subsequent operations. When cleaning the old oil pipe or pre-treating the new oil pipe, start the rotating motor 5. The rotating motor 5 is fixedly mounted on the turntable 4. Its rotation will drive the turntable 4 to rotate around the bearing 3. During the rotation of the turntable 4, the cleaning assembly 14 stops rotating when it is on the same horizontal line as the oil pipe body 17, and then start the translation motor. Machine 1602, since the output shaft of the translation motor 1602 is fixedly connected to the translation screw 1603, after the translation motor 1602 is started, it will drive the translation screw 1603 to start rotating. At this time, the threaded block 1605 threadedly connected to the translation screw 1603 will start to move under the rotation of the translation screw 1603. At the same time, the sliding block 1606 installed on the outer surface of the translation guide column 1604 will slide synchronously with the movement of the threaded block 1605, so that it moves to the outer surface of the cleaning component 14, and then start the cleaning movement motor 1403. The cleaning movement motor 1403 is fixedly installed on the third mounting disk 1402, and its output shaft is connected to the third screw 1404. The fixed disk 1406 will move along the threaded direction on the third screw 1404 The cleaning blade 1411 is moved to the left of the cleaning frame 1409, and the cleaning blade 1411 is inserted into the groove 1410 on the inner surface of the cleaning frame 1409 to clean the inner wall of the old oil pipe body 17. When the cleaning blade 1411 needs to be replaced, the mounting bolt 1412 installed on the outer surface of the cleaning frame 1409 and penetrating the cleaning frame 1409 and the cleaning blade 1411 is first pulled out, and then the old cleaning blade 1411 is taken out of the groove 1410, and the new cleaning blade 1411 is inserted, and then the mounting bolt 1412 is inserted to complete the replacement of the cleaning blade 1411, so as to ensure the long-term effective work of the cleaning component 14 and extend its service life. The translation assembly 16 and the translation motor 1602 rotate in the opposite direction, driving the translation screw 1603 to rotate in the opposite direction, so that the threaded block 1605 moves in the opposite direction along the translation screw 1603, and the sliding block 1606 slides synchronously on the translation guide column 1604, thereby driving the mounting plate 1607 to move, so that the oil pipe body 17 withdraws from the processing cavity 19, and after the heat shrink sleeve 18 is placed, the oil pipe body 17 can be returned to the processing cavity 19 again. Prior to this, the turntable 4 is rotated so that the smoothing assembly 13 is located inside the oil pipe body 17, and then the smoothing moving motor 1303 is started. The smoothing moving motor 1303 is fixedly mounted on the second mounting disk 1302, and its output shaft is connected to the second screw 1304, and is also slidably connected to the second guide rod 1305.Therefore, the rotating disk 1306 and the rotating disk 2 1308 will move along the thread direction on the second screw rod 1304, and the rotating disk 1306 and the rotating disk 2 1308 connected by the connecting rod 1307 will move synchronously. The rotating column 1309 rotatably installed on the inner surface of the connecting rod 1307 can rotate freely in the connecting rod 1307, and the telescopic rod 1310 fixedly installed on the outer surface of the rotating column 1309 can be extended and retracted according to the actual situation of the inner wall of the oil pipe body 17. The smoothing roller 1311 rotatably installed on the outer surface of the rotating column 1309 will rotate on the rotating column 1 1309 rotates, and multiple smoothing rollers 1311 can smooth the inner wall of the oil pipe body 17 at the same time, and the design of the telescopic rod 1310 can adapt to the unevenness of the inner wall of the oil pipe body 17 to ensure the smoothing effect, so that the heat shrink sleeve 18 and other protective materials can better fit the inner wall of the oil pipe body 17, and then withdraw the oil pipe body 17, repeat the operation of the above-mentioned translation component 16, move the oil pipe body 17 to a suitable position, and then start the rotation motor 5 again, rotate the turntable 4, so that the heating component 6 and the oil pipe body 17 are on the same horizontal line, and the relevant parts are The components are accurately connected through the positioning plate 10, etc., and the heating moving motor 603 is started. The heating moving motor 603 is fixedly installed on the first mounting plate 602, and its output shaft is connected to the first screw rod 604. The two connecting plates 606 will move along the thread direction on the first screw rod 604, and the accuracy of the moving direction is guaranteed under the guidance of the first guide rod 605. At this time, the power supply body 611 can supply power to the heating tube 609, so that the heating tube 609 heats up and heats the oil pipe body 17. The heating moving motor 603, the first screw rod 604 and The cooperation of the first guide rod 605 can accurately control the position of the heating tube 609, so that it can accurately heat the part of the oil pipe body 17 that needs to be heated, and then the oil pipe body 17 is withdrawn from the processing cavity 19, and the operation of the smoothing component 13 is repeated. The translation component 16 is started again to move the oil pipe body 17, and the rotating motor 5 is started to rotate the turntable 4, so that the smoothing component 13 and the oil pipe body 17 are located on the same horizontal line again, and the smoothing moving motor 1303 is started. Through the coordinated movement of a series of components, the inner wall of the oil pipe body 17 is smoothed again.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for protecting the inner cavity of an oil pipe, comprising a bottom mounting frame (1), and a limit plate (2) and a support plate (15) fixedly mounted on the bottom mounting frame (1) and having a semi-C-shaped cross section, characterized in that: A bearing (3) is fixedly mounted on the outer surface of the limit plate (2); a turntable (4) is rotatably mounted on the side of the bearing (3) away from the limit plate (2); a rotating motor (5) is fixedly mounted on the side of the turntable (4) away from the bearing (3); a heating component (6), a smoothing component (13) and a cleaning component (14) are fixedly mounted on the side of the turntable (4) away from the rotating motor (5); and the heating component (6), the smoothing component (13) and the cleaning component (14) are fixedly mounted on the other side of the turntable (4) away from the rotating motor (5). A limit plate (7) is fixedly mounted on both ends of the support plate (15), a translation assembly (16) is fixedly mounted on the other end of the support plate (15) away from the bottom mounting frame (1), an oil pipe body (17) is arranged on the other end of the translation assembly (16) away from the bottom mounting frame (1), a processing cavity (19) is fixedly mounted on one side of the limit plate (2) away from the mounting and on one side of the bearing (3) away from the rotating motor (5), and a support seat (20) adapted to the translation assembly (16) is fixedly mounted on the inner surface of the processing cavity (19).

2. The oil pipe inner cavity protection device according to claim 1, characterized in that: The translation assembly (16) comprises a base (1601) at the other end of the bottom mounting frame (1) away from the limit plate (2), a translation motor (1602) is fixedly mounted on the outer surface of the base (1601), a translation screw (1603) is fixedly mounted on the output shaft of the translation motor (1602), a translation guide column (1604) is fixedly mounted on one end of the base (1601) close to the bottom mounting frame (1), and the translation screw (1603) is fixedly mounted on the output shaft of the translation motor (1602). 03) The outer surface is threadedly connected to a threaded block (1605), the outer surface of the translation guide column (1604) is slidably connected to a sliding block (1606), the other end of the threaded block (1605) and the sliding block (1606) away from the translation guide column (1604) is fixedly mounted with a mounting plate (1607), and the other end of the translation screw rod (1603) and the translation guide column (1604) away from the bottom mounting frame (1) is adapted to the support seat (20).

3. The oil pipe inner cavity protection device according to claim 2, characterized in that: A limiting seat (1608) is fixedly installed on the other end of the mounting plate (1607) away from the translation guide column (1604), and a rotating column 2 (1609) is rotatably installed on the inner surface of the limiting seat (1608). A limiting sleeve (1610) adapted to the oil pipe body (17) is fixedly installed on the other end of the rotating column 2 (1609) away from the limiting seat (1608).

4. The oil pipe inner cavity protection device according to claim 1, characterized in that: The cleaning assembly (14) comprises a third mounting frame (1401) and a cleaning frame (1409) fixedly mounted on the other three ends of the rotating disk (4) away from the rotating motor (5); a third mounting plate (1402) fixedly mounted on the other three ends of the third mounting frame (1401) away from the rotating disk (4); a cleaning movable motor (1403) fixedly mounted on the three ends of the third mounting plate (1402) close to the third mounting frame (1401); a third screw rod (1404) fixedly mounted on the output shaft of the cleaning movable motor (1403); The other three ends of the third mounting plate (1402) away from the third mounting frame (1401) are fixedly mounted with a third guide rod (1405); the outer surface of the third screw rod (1404) is threadedly connected with a fixed plate (1406) which is slidably connected to the third guide rod (1405); the outer surface of the fixed plate (1406) is provided with a connecting block (1407); one end of the connecting block (1407) is located on the outer surface of the cleaning frame (1409) and the other end extends to the outer surface of the fixed plate (1406) and is provided with a connecting plate 2 (1408).

5. The oil pipe inner cavity protection device according to claim 4, characterized in that: The outer surface of the second connecting plate (1408) is provided with a cleaning frame (1409) adapted to the connecting block (1407); the inner surface of the cleaning frame (1409) is provided with a groove (1410); a cleaning knife (1411) is plugged and installed on the inner surface of the groove (1410); the outer surface of the cleaning frame (1409) is provided with a mounting bolt (1412) penetrating the cleaning frame (1409) and the cleaning knife (1411) and extending to the outer surface thereof.

6. The oil pipe inner cavity protection device according to claim 1, characterized in that: The inner wall of the oil pipe body (17) is provided with a heat shrink sleeve (18), and the heat shrink sleeve (18) is made of one of polyolefin, fluororubber and ethylene-vinyl acetate copolymer (EVA) materials.

7. The oil pipe inner cavity protection device according to claim 1, characterized in that: The smoothing component (13) comprises a second mounting frame (1301) fixedly mounted on the other end of the turntable (4) away from the rotating motor (5), a second mounting plate (1302) fixedly mounted on the other two ends of the second mounting plate (1301) away from the turntable (4), a smoothing moving motor (1303) fixedly mounted on the two ends of the second mounting plate (1302) close to the second mounting frame (1301), a second screw rod (1304) fixedly mounted on the output shaft of the smoothing moving motor (1303), a second guide rod (1305) fixedly mounted on the other two ends of the second mounting plate (1302) away from the second mounting frame (1301), and a rotating plate 1 (1306) and a rotating plate 2 (1308) threadedly connected to the second guide rod (1305) on the outer surface of the second screw rod (1304).

8. The oil pipe inner cavity protection device according to claim 7, characterized in that: A connecting rod (1307) connected to the rotating disk 2 (1308) is fixedly installed on the outer surface of the rotating disk 1 (1306); a rotating column 1 (1309) is rotatably installed on the inner surface of the connecting rod (1307); a telescopic rod (1310) is fixedly installed on the outer surface of the rotating column 1 (1309); a smoothing roller (1311) is rotatably installed on the outer surface of the rotating column 1 (1309); a connecting column (1312) connected to another rotating disk 2 (1308) is fixedly installed on the outer surface of the rotating disk 2 (1308); a plurality of connecting rods (1307), rotating column 1 (1309), telescopic rod (1310) and smoothing roller (1311) are arranged in a ring-shaped distribution with respect to the center line of the rotating disk 1 (1306); the rotating disk 1 (1306) and the rotating disk 2 (1308) at both ends of the connecting column (1312) are staggeredly distributed.

9. The oil pipe inner cavity protection device according to claim 1, characterized in that: The heating component (6) comprises a first mounting frame (601) fixedly mounted on the other end of the turntable (4) away from the rotating motor (5); a first mounting plate (602) fixedly mounted on the other end of the first mounting plate (601) away from the turntable (4); a heating movable motor (603) fixedly mounted on the end of the first mounting plate (602) close to the first mounting frame (601); a first screw rod (604) fixedly mounted on the output shaft of the heating movable motor (603); a first guide rod (605) fixedly mounted on the other end of the first mounting plate (602) away from the first mounting frame (601); The outer surface of the screw rod (604) is threadedly connected to two connection disks (606) that are slidably connected to the first guide rod (605); a connection plate (607) and a power supply body (611) are fixedly installed between the two connection disks (606); a limit frame (608) is fixedly installed on the outer surface of the connection plate (607); a heating tube (609) distributed in an inverted "S" shape is fixedly installed on the inner surface of the limit frame (608); a protective frame (610) is fixedly installed on the other end of the limit frame (608) away from the heating tube (609); and the power supply body (611) is electrically connected to the heating tube (609).

10. The oil pipe inner cavity protection device according to claim 1, characterized in that: The outer surface of the limit plate (7) is penetrated by a plurality of positioning bolts (8) distributed in an annular shape with respect to the limit plate (7); a bearing (9) is rotatably mounted on the outer surface of the limit plate (7); a positioning plate (10) is provided on the side of the bearing (9) and the limit plate (7) away from the rotating motor (5); a positioning bolt (11) extending into the interior of the limit plate (7) and a positioning bolt (12) extending into the interior of the bearing (9) are penetrated on the side of the positioning plate (10) away from the limit plate (7); the positioning bolts (8) correspond one to one with the oil pipe body (17).

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