Pressure blanking plug of high-pressure oil pipe

Abstract

The invention relates to the technical field of blanking plugs, and discloses a pressure blanking plug of a high-pressure oil pipe, which comprises a lower pressing sleeve, and a connecting seat, an upper center rod, a middle center rod and a lower center rod which are positioned at the lower part of the lower pressing sleeve, an upper rubber sleeve is arranged between the lower pressing sleeve and the connecting seat, and a lifting head is arranged at the top end of the upper center rod; an inserting column is fixedly installed at the end, away from the lifting head, of the upper center rod, and an inserting groove is formed in the end, close to the upper center rod, of the middle center rod. According to the high-pressure oil pipe pressure blanking plug, the upper center rod drives the threaded column to rotate, so that the slip blocks extend outwards around the slip rotating shaft, the pawls tightly abut against an oil pipe, and the slip blocks and the pawls which are distributed up and down and annularly arranged enhance the fixing stability; two times of setting are achieved through pushing of the external pressure executing mechanism and the spring, reliability is improved, setting of the upper rubber sleeve and the lower rubber sleeve is automatically relieved through movable design of the slip assembly after the external pressure executing mechanism is removed, and operation is easy and practical.

Description

Technical Field

[0001] The invention relates to the technical field of plugging devices, in particular to a pressure plugging device for a high-pressure oil pipe. Background Art

[0002] The high-pressure oil pipe plug is an important tool that plays a key role in specific scenarios. In the industrial field, especially in systems involving high-pressure oil transmission, its existence is crucial. Its main function is to effectively seal the high-pressure oil pipe to prevent oil leakage. It is usually made of strong and durable materials and can withstand the huge pressure brought by the high-pressure environment.

[0003] The high-pressure oil pipe plug is exquisitely designed and generally includes sealing components, a main structure and a locking mechanism. The sealing components are mostly made of high-quality elastic materials to ensure a close fit with the inner wall of the oil pipe to achieve a reliable sealing effect. The main structure provides support and stability for the entire plug, while the locking mechanism can firmly fix the plug in the oil pipe to prevent displacement under high pressure.

[0004] In practical applications, such as oil extraction and machinery maintenance, when the oil pipeline needs to be maintained, inspected or parts replaced, the high-pressure oil pipe plugger can quickly play a role. It can seal the oil pipeline in a short time to avoid safety hazards and environmental pollution caused by oil splashing, and also provide convenient conditions for maintenance work.

[0005] The Chinese invention patent announcement number: CN111691843B discloses: a tubing plug, which is lowered to the bottom of the tubing to be sealed with the guide head facing downward, so that when the lifting joint is lifted to make the tubing plug move upward, the pawl assembly can be stuck in the tubing, and the limit shaft and the tubing are in a relatively static state, and then the lifting joint is continued to be lifted. At this time, the main body moves upward relative to the limit shaft, the outer wall of the limit shaft is separated from the second limit component, and the second limit component moves toward the second limit component under the action of external force. When the oil pipe is plugged in the oil pipeline, the oil pipe plugger moves in the blind hole, and the spring squeezes the seat seal assembly under the elastic force, causing the seat seal assembly to expand and deform, thereby sealing the oil pipe. However, the oil pipe plugger has only one set of slip components. During actual use, the oil pipe plugger often slides down, making it inconvenient to position. Moreover, the oil pipe plugger also has only one set of seat seal assemblies. Under actual use, the seal still fails, affecting the maintenance work. Moreover, the oil pipe plugger cannot be adjusted according to the actual situation, and has great limitations. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a pressure plugging device for a high-pressure oil pipe, which can effectively solve the problems in the prior art.

[0007] The technical solution adopted by the present invention is: a pressure plugger for a high-pressure oil pipe, comprising a lower pressure sleeve and a connecting seat, an upper center rod, a middle center rod and a lower center rod located at the lower part of the lower pressure sleeve, an upper rubber cylinder is arranged between the lower pressure sleeve and the connecting seat, a lifting head is arranged at the top of the upper center rod, a plug-in column is fixedly installed at the end of the upper center rod away from the lifting head, a plug-in groove is provided at the end of the middle center rod close to the upper center rod, a rack is fixedly installed at the end of the middle center rod away from the upper center rod, a locking spring seat is fixedly installed at the end of the lower center rod close to the middle center rod, a tooth groove adapted to the rack is provided at the end of the locking spring seat close to the middle center rod, a locking pin is fixedly installed on the outer diameter surface of one end of the lower center rod close to the middle center rod, and the end of the lower center rod away from the middle center rod is installed in sequence from top to bottom. There are bearing seats, connecting plates, connecting columns and guide heads, a plug pin is arranged between the connecting columns and the guide heads, a hollow lower protective sleeve is arranged on the outer side of the lower center rod, a bottom plate which is plugged and installed with the lower protective sleeve is arranged on the end of the lower protective sleeve away from the lower pressure sleeve, an upper partition and a lower partition are arranged inside the end of the lower protective sleeve away from the bottom plate, a piston assembly is arranged on the outer side of the center rod between the upper partition and the lower partition, a spring is arranged on the lower partition and the lock spring seat, two connecting rods are fixedly installed inside the end of the lower protective sleeve close to the bottom plate, a locking sleeve sleeve is arranged between the two connecting rods, a locking sleeve groove is opened on the outer side of the locking sleeve, a cava assembly and a lower rubber cylinder are arranged in sequence from top to bottom between the connecting seat and the lower protective sleeve, and an interconnecting connecting pipe is arranged between the upper partition and the lower rubber cylinder.

[0008] Preferably, the cava assembly includes a joint, a first push-down column, a first threaded column, a second push-down column, a second threaded column, a cava sleeve, a cava groove, a cava shaft, a cava block and a pawl, and the end of the upper center rod close to the middle center rod is sequentially installed with a joint, a first push-down column, a first threaded column, a second push-down column and a second threaded column from top to bottom, and two identical cava sleeves are arranged between the connecting seat and the lower rubber cylinder, a cava groove is opened on the outer side of the cava sleeve, a cava shaft is rotatably installed on the inner side of the cava sleeve located inside the cava groove, a cava block is rotatably installed on the inner side of the cava sleeve located inside the cava groove through the cava shaft, and a pawl is fixedly installed on the outer side of the cava block.

[0009] Through the above technical scheme, the upper center rod drives the joint, the first push column, the first threaded column, the second push column and the second threaded column to rotate, wherein the first threaded column transmits power to the cava block at the bottom of the connecting seat, and at this time the cava block at the bottom of the connecting seat moves outward around the cava rotating axis under the outward push of the first threaded column, and the second threaded column transmits power to the cava block at the top of the lower rubber cylinder, and at this time the cava block at the top of the lower rubber cylinder moves outward around the cava rotating axis under the outward push of the first threaded column, and the oil pipe is tightened by the ratchet on the outside of the cava block, and the entire pressure plugger can be fixed inside the oil pipe.

[0010] Preferably, the center lines of the upper center rod, the middle center rod and the lower center rod are located on the same vertical line, the cross-sections of the plug-in columns and the plug-in grooves are both "convex" shaped structures, the plug-in columns and the plug-in grooves are plug-connected, and the lower end of the upper center rod and the upper end of the middle center rod are both located inside the lower protective cover.

[0011] Through the above technical solution, when in use, through the design of the plug-in column and the plug-in slot, the upper center rod can transmit power to the middle center rod without affecting the up and down movement of the middle center rod.

[0012] Preferably, the rack is adapted to the tooth grooves, and the number of tooth grooves is twice the number of racks, the spring extends to the interior of the lock spring seat, the spring and the lower partition are in conflict with each other, the spring and the center rod are sleeved, the upper partition and the lower protective sleeve are fixedly connected, and the lower partition and the piston assembly are both in conflict with the lower protective sleeve.

[0013] Through the above technical solution, when in use, the rack at the lower part of the middle center rod will be stuck in the tooth groove inside the upper lock spring seat of the lower center rod. At this time, the middle center rod can drive the lower center rod to rotate. When the rack is stuck in the tooth groove inside the upper lock spring seat of the lower center rod, the middle center rod can rotate by itself without affecting the lower center rod, thereby playing a coupling role.

[0014] Preferably, the center lines of the lower center rod, the locking sleeve and the lower protective sleeve are located on the same vertical line, the locking sleeve is sleeved on the outside of the lower center rod, the locking sleeve groove is adapted to the locking pin, the cross-section of the locking sleeve groove is an "L"-shaped structure, and the locking pin and the lower protective sleeve do not contact each other.

[0015] Through the above technical solution, when in use, through the design of the locking sleeve groove and the locking pin, the locking pin can be rotated inside the locking sleeve groove and then rise, or lowered and then rotated, which plays both a locking role and a coupling role.

[0016] Preferably, the center lines of the lower center rod, bearing seat, connecting plate, connecting column and guide head are located on the same vertical line, the lower center rod is rotatably connected to the connecting plate through the bearing seat, the connecting plate and the connecting column are fixedly connected, the guide head and the connecting column are plug-in installed, and the guide head and the connecting column are locked and connected by a plug pin.

[0017] Through the above technical solution, when the lower center rod rotates, the lower center rod will not transmit power to the guide head, ensuring that the connecting disk and the guide head can only move up and down.

[0018] Preferably, the piston assembly is located inside the lower protective sleeve, and the lower protective sleeve, the upper partition and the lower partition together form an oil storage chamber, and the interior of the oil storage chamber is filled with hydraulic medium, and the hydraulic medium is one or more of mineral oil, synthetic oil, water, and ethylene glycol. The oil storage chamber and the lower rubber cylinder are interconnected through a connecting pipe.

[0019] Through the above technical solution, when in use, after the lock of the lower center rod is opened, the guide head moves upward under the pressure of the pipeline, and the guide head transmits the thrust to the lower center rod through the connecting plate, the connecting column and the bearing seat. The lower center rod transmits the power to the spring through the lock spring seat, and the lock spring seat squeezes the spring. Due to the action and reaction forces, the spring pushes the lower partition plate and the piston assembly to move upward, and the piston assembly squeezes the hydraulic medium inside the oil storage chamber. At this time, the hydraulic medium enters the interior of the lower rubber cylinder through the connecting pipe. Under the limit of the slip assembly, the lower rubber cylinder is squeezed and stretched open, thereby realizing the second sealing of the oil pipe.

[0020] Preferably, the first push-down column has the same structure as the second push-down column, the first threaded column has the same structure as the second threaded column, and the cava blocks and pawls are provided in two identical groups, the two groups of cava blocks and pawls are distributed up and down, each group of cava blocks is distributed in a ring shape, and each group of pawls is distributed in a ring shape.

[0021] Through the above technical solution, through the design of two sets of slip blocks and ratchets, the pressure plugger can be better fixed inside the oil pipe, making the device more stable.

[0022] Preferably, the first threaded column is threadedly connected to the slip block at the bottom of the connecting seat, and the second threaded column is threadedly connected to the slip block at the top of the lower rubber cylinder.

[0023] Through the above technical solution, the two groups of slip blocks and ratchets can be pushed to expand outward, which can better fix the pressure plugger inside the oil pipe and make the device more stable.

[0024] Preferably, the lower pressure sleeve is connected to an external pressure actuator, and the pulling head is connected to an external rotation actuator.

[0025] Through the above technical scheme, when the pressure plugger is fixed inside the oil pipe, the external pressure actuator can squeeze the lower pressure sleeve, and the lower pressure sleeve can transmit power to the upper rubber cylinder. At this time, the connecting seat and the lower pressure sleeve squeeze the upper rubber cylinder at the same time, and the upper rubber cylinder is deformed after being squeezed, thereby realizing the seat sealing of the oil pipe. The external rotation actuator can transmit power to the upper center rod, the upper center rod can transmit power to the middle center rod, and the middle center rod can transmit power to the lower center rod.

[0026] Compared with the prior art, the present invention provides a pressure plugging device for a high-pressure oil pipe, which has the following features:

[0027] Beneficial effects:

[0028] 1. The pressure plug of the high-pressure oil pipe drives the threaded column to rotate by the upper center rod, so that the slip blocks at the lower part of the connecting seat and the upper part of the lower rubber cylinder expand outward around the slip rotating shaft. The ratchet on the outer side of the slip block can tightly press against the oil pipe, thereby firmly fixing the entire pressure plug inside the oil pipe. More importantly, the two groups of slip blocks and ratchet are distributed up and down, and each group of slip blocks and ratchet are arranged in a ring, which greatly enhances the stability of the fixation;

[0029] 2. The pressure plug of the high-pressure oil pipe is provided with an upper rubber cylinder and a lower rubber cylinder. The upper rubber cylinder can squeeze the lower pressure sleeve with the help of an external pressure actuator to achieve the first sealing. The lower rubber cylinder, under the push of the spring, makes the lower partition plate and the piston assembly move upward. The piston assembly squeezes the hydraulic medium inside the oil storage chamber. The hydraulic medium enters the lower rubber cylinder through the connecting pipe. The lower rubber cylinder is squeezed and stretched open under the limiting action of the slip assembly, thereby achieving the second sealing of the oil pipe. The two sealing operations significantly improve the reliability of the pressure plug;

[0030] 3. The pressure plug of the high-pressure oil pipe is designed with a movable slip assembly. Only by removing the external pressure actuator, the upper and lower rubber cylinders will automatically release the seal with the oil pipe. The overall operation is relatively simple and practical.

[0031] 4. The pressure plugger of the high-pressure oil pipe is designed with upper and lower rubber cylinders, which are deformed in different ways to achieve sealing. Even if the pressure actuator is removed, the oil pipe can still be sealed through the cooperation of the slip assembly and the lower rubber cylinder. The lower rubber cylinder is pushed by the oil pipe to seal. When facing different situations, the upper and lower rubber cylinders can be sealed at the same time or the lower rubber cylinder can be sealed. The design is reasonable and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0033] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0034] Figure 3 The three-dimensional structure of the present invention is shown in FIG. Figure 3 ;

[0035] Figure 4 The internal structure of the present invention is shown in FIG. Figure 1 ;

[0036] Figure 5 The semi-section structure of the present invention is shown in FIG. Figure 1 ;

[0037] Figure 6 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0038] Figure 7 The internal structure of the present invention is shown in FIG. Figure 2 ;

[0039] Figure 8 This is a schematic diagram of the installation structure of the slip assembly of the present invention;

[0040] Fig. 9 The internal structure of the present invention is shown in FIG. Figure 3 ;

[0041] Fig.10 It is a schematic diagram of the split structure of the lower center rod and the middle center rod of the present invention;

[0042] Fig.11 This is a schematic diagram of the guide head installation structure of the present invention;

[0043] Fig.12 This is a schematic diagram of the installation structure of the lock spring seat of the present invention;

[0044] Fig.13 This is a schematic diagram of the cross-sectional structure of the slip assembly of the present invention;

[0045] Fig.14 This is a schematic diagram of the three-dimensional structure of the slip sleeve of the present invention;

[0046] Fig.15 This is a schematic diagram of the locking sleeve installation structure of the present invention.

[0047] Among them: 1. Lower pressure sleeve; 2. Upper center rod; 3. Lifting head; 6. Piston assembly; 7. Rack; 8. Lower center rod; 9. Locking pin; 10. Bearing seat; 11. Connecting plate; 12. Connecting column; 13. Guide head; 14. Plug pin; 15. Lock spring seat; 16. Tooth groove; 17. Upper rubber cylinder; 18. Connecting seat; 19. Slip assembly; 1901. Joint; 1902. First push-down column; 1903. First threaded column; 1904. Second push-down column Column; 1905, second threaded column; 1906, cava sleeve; 1907, cava groove; 1908, cava shaft; 1909, cava block; 1910, pawl; 20, lower rubber cylinder; 21, lower protective sleeve; 22, bottom plate; 23, upper partition; 24, lower partition; 25, spring; 26, connecting rod; 27, locking sleeve; 28, locking sleeve groove; 29, connecting pipe; 30, center rod; 31, plug-in column; 32, plug-in groove; 33, oil storage chamber. DETAILED DESCRIPTION

[0048] 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.

[0049] Embodiment 1: Figure 1-15 As shown, a pressure plugger of a high-pressure oil pipe provided by the present invention comprises a lower pressure sleeve 1 and a connecting seat 18, an upper center rod 2, a middle center rod 30 and a lower center rod 8 located at the lower part of the lower pressure sleeve 1, an upper rubber cylinder 17 is arranged between the lower pressure sleeve 1 and the connecting seat 18, a lifting head 3 is arranged at the top of the upper center rod 2, a plug-in column 31 is fixedly installed at the end of the upper center rod 2 away from the lifting head 3, a plug-in groove 32 is provided at the end of the middle center rod 30 close to the upper center rod 2, a rack 7 is fixedly installed at the end of the middle center rod 30 away from the upper center rod 2, a locking spring seat 15 is fixedly installed at the end of the lower center rod 8 close to the middle center rod 30, a tooth groove 16 adapted to the rack 7 is provided at the end of the locking spring seat 15 close to the middle center rod 30, a locking pin 9 is fixedly installed on the outer diameter surface of one end of the lower center rod 8 close to the middle center rod 30, and a bearing seat 10, a connecting plate 11, The connecting column 12 and the guide head 13 are provided with a plug pin 14 between the connecting column 12 and the guide head 13. A hollow lower protective sleeve 21 is provided on the outer side of the lower center rod 8. A bottom plate 22 connected to the lower protective sleeve 21 is provided at one end of the lower protective sleeve 21 away from the lower pressure sleeve 1. An upper partition 23 and a lower partition 24 are provided inside the end of the lower protective sleeve 21 away from the bottom plate 22. An outer side of the central center rod 30 is provided between the upper partition 23 and the lower partition 24. The piston assembly 6, the lower partition plate 24 and the lock spring seat 15 are provided with a spring 25, and two connecting rods 26 are fixedly installed inside the lower protective sleeve 21 near one end of the bottom plate 22, a locking sleeve sleeve 27 is provided between the two connecting rods 26, and a locking sleeve groove 28 is opened on the outer side of the locking sleeve sleeve 27, and the cava assembly 19 and the lower rubber cylinder 20 are arranged in sequence from top to bottom between the connecting seat 18 and the lower protective sleeve 21, and an interconnecting connecting pipe 29 is provided between the upper partition plate 23 and the lower rubber cylinder 20.

[0050] Specifically, the slip assembly 19 includes a joint 1901, a first push-down column 1902, a first threaded column 1903, a second push-down column 1904, a second threaded column 1905, a slip sleeve 1906, a slip groove 1907, a slip shaft 1908, a slip block 1909 and a pawl 1910. The end of the upper center rod 2 close to the middle center rod 30 is sequentially installed with the joint 1901, the first push-down column 1902, the first threaded column 1903, the second push-down column 1904, the second threaded column 1905, the slip sleeve 1906, the slip groove 1907, the slip shaft 1908, the slip block 1909 and the ratchet 1910 from top to bottom. 4 and the second threaded column 1905, two identical slip sleeves 1906 are arranged between the connecting seat 18 and the lower rubber cylinder 20, the outer side of the slip sleeve 1906 is provided with a slip groove 1907, the inner side of the slip sleeve 1906 is located inside the slip groove 1907 and a slip shaft 1908 is rotatably installed, the inner side of the slip sleeve 1906 is located inside the slip groove 1907 and a slip block 1909 is rotatably installed through the slip shaft 1908, and a ratchet 1910 is fixedly installed on the outer side of the slip block 1909. The advantage is that the upper center rod 2 drives the joint 1901, the first push-down column 1902, the first threaded column 1903, the second push-down column 1904 and the second threaded column 1905 to rotate, wherein the first threaded column 1903 transmits power to the cava block 1909 at the bottom of the connecting seat 18. At this time, the cava block 1909 at the bottom of the connecting seat 18 moves outward around the cava rotating shaft 1908 under the outward push of the first threaded column 1903, and the second threaded column 1905 transmits power to the cava block 1909 at the top of the lower rubber cylinder 20. At this time, the cava block 1909 at the top of the lower rubber cylinder 20 moves outward around the cava rotating shaft 1908 under the outward push of the first threaded column 1903, and the oil pipe is tightened by the ratchet 1910 on the outside of the cava block 1909, and the entire pressure plugger can be fixed inside the oil pipe.

[0051] Specifically, the center lines of the upper center rod 2, the middle center rod 30 and the lower center rod 8 are located on the same vertical line, the cross-sections of the plug-in column 31 and the plug-in slot 32 are both "convex" shaped structures, the plug-in column 31 and the plug-in slot 32 are plug-in connected, and the lower end of the upper center rod 2 and the upper end of the middle center rod 30 are both located inside the lower protective cover 21. The advantage is that when in use, through the design of the plug-in column 31 and the plug-in slot 32, the upper center rod 2 can transmit power to the middle center rod 30 without affecting the up and down movement of the middle center rod 30.

[0052] Specifically, the rack 7 is matched with the tooth groove 16, and the number of the tooth groove 16 is twice the number of the rack 7, the spring 25 extends to the inside of the lock spring seat 15, the spring 25 and the lower partition 24 are mutually in conflict, the spring 25 and the middle center rod 30 are sleeved, the upper partition 23 and the lower protective sleeve 21 are fixedly connected, and the lower partition 24 and the piston assembly 6 are both in conflict with the lower protective sleeve 21. The advantage is that when in use, the rack 7 at the lower part of the middle center rod 30 will be stuck in the tooth groove 16 inside the lock spring seat 15 on the upper part of the lower center rod 8, and the middle center rod 30 can drive the lower center rod 8 to rotate. When the rack 7 is stuck in the tooth groove 16 inside the lock spring seat 15 on the upper part of the lower center rod 8, the middle center rod 30 can rotate by itself without affecting the lower center rod 8, thereby playing a coupling role.

[0053] Embodiment 2: Figure 5-15 As shown, as an improvement to the previous embodiment

[0054] Specifically, the center lines of the lower center rod 8, the locking sleeve 27 and the lower protective sleeve 21 are located on the same vertical line, the locking sleeve 27 is sleeved on the outer side of the lower center rod 8, the locking sleeve groove 28 is adapted to the locking pin 9, the cross section of the locking sleeve groove 28 is an "L"-shaped structure, and the locking pin 9 and the lower protective sleeve 21 do not contact each other. The advantage is that when in use, through the design of the locking sleeve groove 28 and the locking pin 9, the locking pin 9 can be rotated inside the locking sleeve groove 28 and then rise, or lowered and then rotated, which plays both a locking role and a coupling role.

[0055] Specifically, the center lines of the lower center rod 8, the bearing seat 10, the connecting plate 11, the connecting column 12 and the guide head 13 are located on the same vertical line, the lower center rod 8 is rotatably connected with the connecting plate 11 through the bearing seat 10, the connecting plate 11 and the connecting column 12 are fixedly connected, the guide head 13 and the connecting column 12 are plug-in installed, and the guide head 13 and the connecting column 12 are locked and connected through the plug pin 14. The advantage is that when the lower center rod 8 rotates, the lower center rod 8 will not transmit power to the guide head 13, ensuring that the connecting plate 11 and the guide head 13 can only move up and down.

[0056] Specifically, the piston assembly 6 is located inside the lower protective sleeve 21, and the lower protective sleeve 21, the upper partition 23 and the lower partition 24 together form an oil storage chamber 33, and the interior of the oil storage chamber 33 is filled with a hydraulic medium, and the hydraulic medium is one or more of mineral oil, synthetic oil, water, and ethylene glycol. The oil storage chamber 33 and the lower rubber cylinder 20 are interconnected through a connecting pipe 29. The advantage is that when in use, after the lock of the lower center rod 8 is opened, the guide head 13 moves upward under the pressure of the pipeline, and the guide head 13 transmits the thrust to the lower center rod 8 through the connecting plate 11, the connecting column 12, and the bearing seat 10. The lower center rod 8 transmits the power to the spring 25 through the lock spring seat 15, and the lock spring seat 15 will squeeze the spring 25. Due to the action force and reaction force, the spring 25 will push the lower partition plate 24 and the piston assembly 6 to move upward, and the piston assembly 6 squeezes the hydraulic medium inside the oil storage chamber 33. At this time, the hydraulic medium will enter the interior of the lower rubber cylinder 20 through the connecting pipe 29. Under the limit of the slip assembly 19, the lower rubber cylinder 20 is squeezed and stretched open, thereby realizing the second sealing of the oil pipe.

[0057] Embodiment 2: Figure 7-15 As shown, as an improvement to the previous embodiment

[0058] Specifically, the first push-down column 1902 has the same structure as the second push-down column 1904, the first threaded column 1903 has the same structure as the second threaded column 1905, and the same two groups of slip blocks 1909 and ratchet 1910 are provided, and the two groups of slip blocks 1909 and ratchet 1910 are distributed up and down, and each group of slip blocks 1909 is distributed in an annular manner, and each group of ratchet 1910 is distributed in an annular manner. The advantage is that the design of the two groups of slip blocks 1909 and ratchet 1910 can better fix the pressure plugger inside the oil pipe, making the device more stable.

[0059] Specifically, the first threaded column 1903 is threadedly connected to the slip block 1909 at the bottom of the connecting seat 18, and the second threaded column 1905 is threadedly connected to the slip block 1909 at the top of the lower rubber cylinder 20. The advantage is that it can push the two sets of slip blocks 1909 and the ratchet 1910 to expand outward, which can better fix the pressure plugger inside the oil pipe and make the device more stable.

[0060] Specifically, the lower pressure sleeve 1 is connected to the external pressure actuator, and the lifting head 3 is connected to the external rotation actuator. The advantage is that when the pressure plug is fixed inside the oil pipe, the external pressure actuator can squeeze the lower pressure sleeve 1, and the lower pressure sleeve 1 can transmit power to the upper rubber cylinder 17. At this time, the connecting seat 18 and the lower pressure sleeve 1 squeeze the upper rubber cylinder 17 at the same time, and the upper rubber cylinder 17 is deformed after being squeezed, thereby realizing the sealing of the oil pipe, and the external rotation actuator can transmit power to the upper center rod 2, the upper center rod 2 can transmit power to the middle center rod 30, and the middle center rod 30 can transmit power to the lower center rod 8.

[0061] Working principle: When in use, the user first connects the lower pressure sleeve 1 to the external pressure actuator, then connects the lifting head 3 to the external rotation actuator, and places the entire pressure plug into the oil pipe. When the pressure plug reaches the specified position inside the oil pipe, the external rotation actuator can transmit power to the upper center rod 2. At this time, the upper center rod 2 drives the joint 1901, the first push-down column 1902, the first threaded column 1903, the second push-down column 1904 and the second threaded column 1905 to rotate, wherein the first threaded column 1903 transmits power to the cava block 1909 at the bottom of the connecting seat 18. At this time, the cava block 1909 at the bottom of the connecting seat 18 rotates around the cava under the external push of the first threaded column 1903 The shaft 1908 moves outward, and the second threaded column 1905 transmits power to the cava block 1909 on the upper part of the lower rubber cylinder 20. At this time, the cava block 1909 on the upper part of the lower rubber cylinder 20 moves outward around the cava rotating shaft 1908 under the outward push of the first threaded column 1903, and the oil pipe is tightened by the pawl 1910 on the outside of the cava block 1909. At this time, the entire pressure plug can be fixed inside the oil pipe. When it is determined that the pressure plug is fixed, when the pressure plug is fixed inside the oil pipe, the external pressure actuator can squeeze the lower pressure sleeve 1, and the lower pressure sleeve 1 can transmit power to the upper rubber cylinder 17. At this time, the connecting seat 18 and the lower pressure sleeve 1 squeeze the upper rubber cylinder 17 at the same time, and the upper rubber cylinder 17 is squeezed. After deformation, the first sealing of the oil pipe is realized. When the first sealing is completed, the external rotary actuator continues to drive the upper center rod 2 to rotate, and the upper center rod 2 drives the middle center rod 30 to rotate. At this time, the locking pin 9 located inside the locking sleeve groove 28 moves to the right. When the locking pin 9 moves to the upper side of the locking sleeve groove 28, the locking force of the locking sleeve sleeve 27 on the lower center rod 8 disappears. The lower center rod 8 moves upward under the pressure inside the oil pipe, and the lock spring seat 15 squeezes the spring 25. Due to the action and reaction force, the spring 25 pushes the lower partition plate 24 and the piston assembly 6 to move upward, and the piston assembly 6 squeezes the hydraulic medium inside the oil storage chamber 33. At this time, the hydraulic medium passes through the connecting pipe 2 9 enters the interior of the lower rubber cylinder 20, and the lower rubber cylinder 20 is squeezed and stretched open, thereby realizing the second sealing of the oil pipe. When the pressure plug needs to be removed, the external pressure actuator on the upper part of the lower pressure sleeve 1 is first removed, and the rotary actuator is driven in reverse. At this time, the pressure received by the upper rubber cylinder 17 disappears. When the upper center rod 2 is rotated in the reverse direction, the pawl 1910 on the outside of the cava block 1909 moves inward. At this time, the anchoring part of the pressure plug and the pipeline disappears, and the cava assembly 19 moves upward under the push of the lower rubber cylinder 20. The pressure inside the lower rubber cylinder 20 is reduced, and the deformation of the lower rubber cylinder 20 is weakened. At this time, the pressure plug can be taken out, and the plug can be disassembled after taking it out. After resetting the internal components, it can be used again.

[0062] 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 pressure plugging device for a high-pressure oil pipe, comprising a lower pressure sleeve (1), a connecting seat (18) located below the lower pressure sleeve (1), an upper center rod (2), a middle center rod (30) and a lower center rod (8), characterized in that: An upper rubber cylinder (17) is arranged between the lower pressure sleeve (1) and the connecting seat (18); a lifting head (3) is arranged at the top of the upper center rod (2); a plug-in column (31) is fixedly installed at one end of the upper center rod (2) away from the lifting head (3); a plug-in groove (32) is provided at one end of the middle center rod (30) close to the upper center rod (2); a rack (7) is fixedly installed at one end of the middle center rod (30) away from the upper center rod (2); and a lower center rod (8) is fixedly installed at one end close to the middle center rod (30). A locking spring seat (15) is provided, and a tooth groove (16) adapted to the rack (7) is provided at one end of the locking spring seat (15) close to the center rod (30). A locking pin (9) is fixedly installed on the outer diameter surface of one end of the lower center rod (8) close to the center rod (30). A bearing seat (10), a connecting plate (11), a connecting column (12) and a guide head (13) are installed in sequence from top to bottom at one end of the lower center rod (8) away from the center rod (30). A plug pin (16) is provided between the connecting column (12) and the guide head (13). 14), a hollow lower protective sleeve (21) is arranged on the outer side of the lower center rod (8), a bottom plate (22) plugged and installed with the lower protective sleeve (21) is arranged at one end of the lower protective sleeve (21) away from the lower pressure sleeve (1), an upper partition plate (23) and a lower partition plate (24) are arranged inside the end of the lower protective sleeve (21) away from the bottom plate (22), a piston assembly (6) is arranged on the outer side of the central center rod (30) between the upper partition plate (23) and the lower partition plate (24), and the lower partition plate (24) is connected to the lock spring seat ( 15) is provided with a spring (25), two connecting rods (26) are fixedly installed inside the lower protective sleeve (21) near one end of the bottom plate (22), a locking sleeve (27) is provided between the two connecting rods (26), and a locking sleeve groove (28) is opened on the outer side of the locking sleeve (27), a slip assembly (19) and a lower rubber cylinder (20) are arranged in sequence from top to bottom between the connecting seat (18) and the lower protective sleeve (21), and an interconnecting connecting pipe (29) is provided between the upper partition plate (23) and the lower rubber cylinder (20).

2. A pressure plugging device for a high-pressure oil pipe according to claim 1, characterized in that: The slip assembly (19) comprises a joint (1901), a first push-down column (1902), a first threaded column (1903), a second push-down column (1904), a second threaded column (1905), a slip sleeve (1906), a slip groove (1907), a slip shaft (1908), a slip block (1909) and a pawl (1910); the end of the upper center rod (2) close to the middle center rod (30) is provided with a joint (1901), a first push-down column (1902), a first threaded column (1903), a second push-down column (1904) and a second threaded column (1905) in sequence from top to bottom. Two threaded columns (1905), two identical cava sleeves (1906) are arranged between the connecting seat (18) and the lower rubber cylinder (20), a cava groove (1907) is opened on the outer side of the cava sleeve (1906), a cava shaft (1908) is rotatably installed inside the cava groove (1907) on the inner side of the cava sleeve (1906), a cava block (1909) is rotatably installed inside the cava groove (1907) on the inner side of the cava sleeve (1906), a cava block (1909) is rotatably installed through the cava shaft (1908) on the inner side of the cava sleeve (1906), and a ratchet (1910) is fixedly installed on the outer side of the cava block (1909).

3. A pressure plugging device for a high-pressure oil pipe according to claim 2, characterized in that: The center lines of the upper center rod (2), the middle center rod (30) and the lower center rod (8) are located on the same vertical line; the cross-sections of the plug-in column (31) and the plug-in slot (32) are both in a "convex"-shaped structure; the plug-in column (31) and the plug-in slot (32) are plug-connected; the lower end of the upper center rod (2) and the upper end of the middle center rod (30) are both located inside the lower protective cover (21).

4. A pressure plugging device for a high-pressure oil pipe according to claim 3, characterized in that: The rack (7) is matched with the tooth groove (16), and the number of the tooth groove (16) is twice the number of the rack (7). The spring (25) extends to the inside of the lock spring seat (15). The spring (25) and the lower partition (24) are in contact with each other. The spring (25) and the center rod (30) are sleeved. The upper partition (23) and the lower protective sleeve (21) are fixedly connected. The lower partition (24) and the piston assembly (6) are both in contact with the lower protective sleeve (21).

5. A pressure plugging device for a high-pressure oil pipe according to claim 4, characterized in that: The center lines of the lower center rod (8), the locking sleeve (27) and the lower protective sleeve (21) are located on the same vertical line; the locking sleeve (27) is sleeved on the outer side of the lower center rod (8); the locking sleeve groove (28) is adapted to the locking pin (9); the cross section of the locking sleeve groove (28) is an "L"-shaped structure; the locking pin (9) and the lower protective sleeve (21) do not contact each other.

6. A pressure plugging device for a high-pressure oil pipe according to claim 5, characterized in that: The center lines of the lower center rod (8), the bearing seat (10), the connecting plate (11), the connecting column (12) and the guide head (13) are located on the same vertical line; the lower center rod (8) is rotatably connected to the connecting plate (11) through the bearing seat (10); the connecting plate (11) and the connecting column (12) are fixedly connected; the guide head (13) and the connecting column (12) are plug-in mounted; and the guide head (13) and the connecting column (12) are locked and connected via a plug pin (14).

7. The pressure plugging device for a high-pressure oil pipe according to claim 1, characterized in that: The piston assembly (6) is located inside the lower protective sleeve (21); the lower protective sleeve (21), the upper partition (23) and the lower partition (24) together form an oil storage chamber (33); the interior of the oil storage chamber (33) is filled with a hydraulic medium, and the hydraulic medium is one or more of mineral oil, synthetic oil, water, and ethylene glycol; the oil storage chamber (33) and the lower rubber cylinder (20) are interconnected through a connecting pipe (29).

8. The pressure plugging device for a high-pressure oil pipe according to claim 2, characterized in that: The first push-down column (1902) and the second push-down column (1904) have the same structure, the first threaded column (1903) and the second threaded column (1905) have the same structure, and the cava blocks (1909) and the pawls (1910) are provided in two identical groups, and the two groups of the cava blocks (1909) and the pawls (1910) are distributed up and down, and each group of the cava blocks (1909) is distributed in a ring shape, and each group of the pawls (1910) is distributed in a ring shape.

9. A pressure plugging device for a high-pressure oil pipe according to claim 8, characterized in that: The first threaded column (1903) is threadedly connected to the cava block (1909) at the bottom of the connecting seat (18), and the second threaded column (1905) is threadedly connected to the cava block (1909) at the top of the lower rubber cylinder (20).

10. The pressure plugging device for a high-pressure oil pipe according to claim 1, characterized in that: The lower pressure sleeve (1) is connected to an external pressure actuator, and the lifting head (3) is connected to an external rotation actuator.

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