High load self-lubricating thrust bearing for marine oil and gas field screw drill

Abstract

This invention provides a high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drill bits, relating to the field of thrust bearings. It includes an inner ring, a ball cage, a biomimetic self-lubricating and shock-absorbing composite washer, and an outer ring. The ball cage consists of two sets of semi-rings, with a semi-circular ring plate A in the middle and on both sides of the semi-rings. The inner side of semi-circular ring plate A is hollow and has an oil reservoir. Oil outlet pipes are connected to both sides of the oil reservoir of semi-circular ring plate A. The semi-rings also have mounting ports, into which a roller and a circular pad are installed. The outer ring consists of two sets of semi-rings facing each other and connected by bolts. The biomimetic self-lubricating and shock-absorbing composite washer is attached between a fixed baffle and the semi-circular baffle. During bearing operation, airflow is introduced into the interior through oblique holes and flows through the surface of the balls via lubricating oil. The lubricating oil inside the roller also flows out intermittently under the action of the oil outlet regulating plate, improving the lubrication inside the bearing.

Description

Technical Field

[0001] This invention relates to the field of thrust bearing technology, and in particular to a high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drill bits. Background Technology

[0002] Screw drills are indispensable downhole power tools in modern oil and gas field drilling operations. They convert the hydraulic energy of drilling fluid (mud) into mechanical energy, directly driving the drill bit to break rocks. Currently, the thrust bearings used in screw drills both domestically and internationally are mainly divided into two categories: rolling thrust bearings and sliding thrust bearings (mainly PDC thrust bearings). However, the bearings used in screw drills in offshore oil and gas fields currently experience high internal temperatures and poor lubrication during operation. Therefore, a high-load-bearing, self-lubricating thrust bearing is needed. Summary of the Invention

[0003] To address the problems in the background art, the present invention provides a high load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drills. When the bearing is working, airflow is sent into the bearing through the inclined hole to reduce the temperature, and the lubricating oil flows through the surface of the ball and the lubricating oil in the drum flows out through the gap under the action of the oil outlet regulating plate, thereby improving the lubrication of the ball and drum rotation inside the bearing.

[0004] The present invention provides a high load-bearing self-lubricating thrust bearing for marine oil and gas field screw drill bits, specifically comprising: an inner ring, a ball cage, a biomimetic self-lubricating and shock-absorbing composite washer, and an outer ring; The inner ring has a central annular groove on the outer side, and the two sides of the central annular groove are respectively provided with a ball outer groove, a side annular groove and a connecting ring plate. Two sets of semi-circular baffles are also inserted into the two outer ends of the inner ring. The ball retainer is composed of two sets of semi-ring frames, and the middle and sides of the semi-ring frames are respectively provided with semi-circular ring plate A and semi-circular ring plate B. The inner side of the semi-circular ring plate A is hollow and has an oil storage tank. The oil filling hole in the middle of the top of the oil storage tank is plugged with a rubber stopper. One end of the bottom side of the semi-circular ring plate A is connected to a connecting post, and the other end is provided with a connecting hole. When the two sets of semi-ring frames are installed, the connecting posts are tightly inserted into the connecting holes. The oil storage tank of the semi-circular ring plate A is also connected to an oil outlet pipe on both sides. The semi-ring frame is also provided with an installation port, and a roller and a circular pad are installed in the installation port respectively. The outer ring is formed by two sets of semi-ring plates facing each other and connected by bolts. One end of the semi-ring plate has a through hole and the other end has a threaded hole. The bolts pass through the through hole and are screwed into the threaded hole for fixation. The inner side of the semi-ring plate has a semi-circular groove A in the middle. On both sides of the semi-circular groove A, there are ball inner grooves, semi-circular groove B and fixed baffles respectively. The biomimetic self-lubricating shock-absorbing composite washers are respectively fitted on both sides of the inner ring and attached between the fixed baffle and the semi-circular baffle.

[0005] Furthermore, the semi-circular baffle is fitted onto the connecting ring plate through a semi-circular slot on it, and is connected to the threaded structure in the connecting hole on the rear side of the semi-circular baffle by passing through the connecting hole on the front side of the semi-circular baffle and the through hole on the connecting ring plate through the connecting hole on the front side of the semi-circular baffle. The semi-circular baffle is provided with six sets of oblique holes, and the inner end of the oblique holes is connected to the air duct.

[0006] Furthermore, the L-end on the outer side of the oil outlet pipe faces the center of the ball and is rotatably fitted with an oil ball, which is attached to the outer surface of the ball.

[0007] Furthermore, a threaded connecting block is fixed on the semi-circular ring plate A at a position opposite to the mounting opening. The threaded connecting block is then fixed by passing through the through hole two on the semi-circular ring plate B, the hole in the middle of the circular pad, and the through tube on the roller in sequence with an internal hex bolt.

[0008] Furthermore, the roller is composed of two sets of half-rollers in contact, and the outer end of the tube inside one half-roller is inserted into the sleeve at the outer end of the tube inside the other half-roller. The contact surfaces of the two sets of half-rollers are respectively provided with sealing grooves, and sealing gaskets are embedded in the sealing grooves. A connecting frame is fixed on the tube, and an oil outlet hole is also provided on the ball cylinder in the middle of the roller.

[0009] Furthermore, the semi-roller is also equipped with an oil outlet regulating plate and an regulating rod. The bottom end of the vertical rod of the oil outlet regulating plate is a circular structure and is movably inserted into the oil outlet hole. One-fifth of the circular structure at the bottom end of the vertical rod protrudes from the oil outlet hole. One end of the regulating rod is movably inserted into the movable hole on the connecting frame, and the other end is fitted with a spring and screwed into the circular plate on the oil outlet regulating plate by threads.

[0010] Furthermore, the ball cylinder in the middle of the roller is respectively attached to the outer groove and the inner groove of the ball, and the cylinders on both sides of the roller are respectively attached to the outer wall of the inner ring and the inner wall of the outer ring.

[0011] Furthermore, the inner arc end of the semicircular ring plate A does not contact the inner wall of the middle ring groove, and the outer arc end does not contact the inner wall of the semicircular ring groove A. Similarly, the inner arc end of the semicircular ring plate B does not contact the inner wall of the side ring groove, and the outer arc end does not contact the inner wall of the semicircular ring groove B.

[0012] Furthermore, the biomimetic self-lubricating shock-absorbing composite gasket is designed with a "sandwich" structure, with the upper and lower layers being pure porous silicon carbide (SiC) ceramic support layers each with a thickness of 0.5 mm, and the middle layer being a porous polyimide (PI) / graphene composite damping layer with a thickness of 0.8 mm.

[0013] The present invention provides a high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drill bits, which has the following beneficial effects: This invention introduces airflow into the bearing through oblique holes to reduce the temperature during bearing operation. Lubricating oil flows through the surface of the balls and through the gaps in the drum under the action of the oil outlet regulating plate, thereby improving the lubrication of the balls and drum rotation inside the bearing.

[0014] In addition, by setting inclined holes and air ducts in the semi-circular baffle, airflow can be blown into the interior of the bearing through the inclined holes during the rotation of the inner ring following the screw drill bit. The airflow also flows through the gaps between the semi-circular ring plate B and the side ring groove, the gap between the semi-circular ring groove B and the gap between the semi-circular ring plate A and the middle ring groove, the gap between the semi-circular ring groove A and the middle ring groove, thus reducing the temperature of the bearing's internal movement.

[0015] In addition, by setting an oil reservoir in the semi-circular ring plate A and connecting it to the ball bearing through an oil outlet pipe, when the bearing is working, the ball bearing drives the oil ball to rotate, so that the lubricating oil in the oil outlet pipe flows through the oil ball to the surface of the ball bearing to lubricate the ball bearing.

[0016] In addition, by setting up a roller and adding lubricating oil inside the roller, when the roller rotates with the inner ring, the circular structure at the bottom of the vertical rod on the oil outlet adjustment plate is squeezed by the outer and inner grooves of the ball bearings and moves into the roller, so that the lubricating oil inside the roller flows out through the oil outlet hole. After the squeezing ends, it automatically returns to its original position under the action of the spring, which can further play a lubricating role. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0018] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0019] In the attached diagram: Figure 1 A schematic diagram of the overall structure of the present invention is shown; Figure 2 The present invention is shown Figure 1 A schematic diagram of the structure after the outer and middle rings are separated; Figure 3 The present invention is shown Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 A schematic diagram of a set of semi-outer ring structures in this invention is shown; Figure 5 The present invention is shown Figure 2 A schematic diagram of the structure after a set of biomimetic self-lubricating shock-absorbing composite washers are pushed inward and two sets of opposing semi-circular baffles are separated from the connecting ring plate; Figure 6 This diagram shows a structural schematic of a set of semicircular baffles after one end is vertically cut. Figure 7 The present invention is shown Figure 5 A schematic diagram of the structure after the two sets of biomimetic self-lubricating and shock-absorbing composite washers are pulled outwards and the ball cage is disassembled. Figure 8 The present invention is shown Figure 7 Enlarged structural diagram at point B; Figure 9 A schematic diagram of the inner ring structure in this invention is shown; Figure 10 This invention shows a schematic diagram of the structure after the rubber plug on the semi-circular ring plate A is pulled out and a set of rollers are separated from the semi-circular frame; Figure 11 The present invention is shown Figure 10 A schematic diagram of the side-tilting structure after the middle roller has been completely disassembled from the semi-ring frame; Figure 12 The present invention is shown Figure 11 A schematic diagram of the structure after vertically cutting the middle semi-circular ring plate A from the side and from top; Figure 13 A schematic diagram of the structure after the roller is disassembled in this invention is shown; Figure 14 This diagram shows the structure of the present invention after the two sets of oil outlet regulating plates and two sets of regulating rods inside a set of semi-drums have been removed. Figure 15 This diagram shows a structural schematic of another set of half-rollers after one end has been vertically cut.

[0020] List of reference numerals 1. Inner ring; 101. Intermediate annular groove; 102. Ball outer retainer groove; 103. Side annular groove; 104. Connecting ring plate; 105. Semi-circular baffle; 1051. Semi-circular slot; 1052. Connecting hole; 1053. Angled hole; 2. Ball retainer; 201. Semi-circular ring plate A; 2011. Oil reservoir; 2012. Rubber plug; 2013. Connecting post; 2014. Connecting hole; 2015. Oil outlet pipe; 20151. Oil droplet; 2016. Threaded connecting block; 202. 203. Semicircular ring plate B; 204. Mounting port; 205. Roller; 206. Pipe; 207. Sealing groove; 208. Sealing gasket; 209. Connecting bracket; 20045. Oil outlet hole; 20046. Oil outlet adjusting plate; 20047. Adjusting rod; 2005. Circular pad; 3. Bionic self-lubricating shock-absorbing composite washer; 4. Outer ring; 401. Through hole; 402. Threaded hole; 403. Semicircular ring groove A; 404. Inner groove of ball bearing; 405. Semicircular ring groove B; 406. Fixing baffle. Detailed Implementation

[0021] To make the objectives, solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0022] Example 1: Please refer to Figures 1 to 15 : This invention proposes a high load-bearing self-lubricating thrust bearing for marine oil and gas field screw drill bits, comprising: an inner ring 1, a ball cage 2, a biomimetic self-lubricating shock-absorbing composite washer 3, and an outer ring 4; The inner ring 1 has a central annular groove 101 in the middle of its outer side, and the two sides of the central annular groove 101 are respectively provided with a ball outer groove 102, a side annular groove 103 and a connecting ring plate 104. The two outer ends of the inner ring 1 are also respectively fitted with two sets of semi-circular baffles 105. The ball retainer 2 is composed of two sets of semi-ring frames. The semi-ring frames are provided with a semi-circular ring plate A201 and a semi-circular ring plate B202 in the middle and on both sides respectively. The inner side of the semi-circular ring plate A201 is hollow and is provided with an oil reservoir 2011. The oil filling hole in the middle of the top of the oil reservoir 2011 is plugged with a rubber stopper 2012. One end of the bottom side of the semi-circular ring plate A201 is connected to a connecting post 2013 and the other end is provided with a connecting hole 2014. When the two sets of semi-ring frames are installed, the connecting post 2013 is tightly inserted into the connecting hole 2014 respectively. The oil reservoir 2011 of the semi-circular ring plate A201 is also connected to an oil outlet pipe 2015 on both sides respectively. The semi-ring frame is also provided with an installation port 203. A roller 204 and a circular pad 205 are installed in the installation port 203 respectively. The outer ring 4 is formed by two sets of semi-ring plates facing each other and connected by bolts. One end of the semi-ring plate is provided with a through hole 401 and the other end is provided with a threaded hole 402. The bolts pass through the through hole 401 and are screwed into the threaded hole 402 for fixation. The inner side of the semi-ring plate is provided with a semi-circular groove A403. On both sides of the semi-circular groove A403, there are ball inner groove 404, semi-circular groove B405 and fixed baffle 406 respectively. The base material of the inner ring 1, the semi-ring frame and the outer ring 4 are all made of 42CrMoA high-strength alloy steel. The surface is treated with carbonitriding, with a penetration depth of 1.2mm and a surface hardness of HRC55, which improves the load-bearing capacity to resist the scouring and wear of mud. The biomimetic self-lubricating shock-absorbing composite washers 3 are respectively fitted on both sides of the inner ring 1 and attached between the fixed baffle 406 and the semi-circular baffle 105.

[0023] In embodiments of the present invention, such as Figure 3 and Figure 8As shown, the L end of the outer side of the oil outlet pipe 2015 faces the center of the ball and is rotatably clamped with an oil ball 20151. The oil ball 20151 is attached to the outer surface of the ball. When the bearing is working, the ball drives the oil ball 20151 to rotate, so that the lubricating oil in the oil outlet pipe 2015 flows through the oil ball 20151 to the surface of the ball to lubricate the ball.

[0024] In embodiments of the present invention, such as Figures 10 to 15 As shown, a threaded connecting block 2016 is fixed on the semi-circular ring plate A201 at a position opposite to the mounting port 203. It is secured by an internal hexagonal bolt that passes sequentially through the through hole 2 on the semi-circular ring plate B202, the hole in the middle of the circular pad 205, and the through tube 2041 on the roller 204, and is screwed into the threaded connecting block 2016. The roller 204 consists of two sets of contacting half-rollers. The outer end of the through tube 2041 in one set of half-rollers is inserted into the sleeve at the outer end of the through tube 2041 in the other set of half-rollers. Sealing grooves 2042 are provided on the contact surfaces of the two sets of half-rollers, and sealing gaskets 2043 are embedded in the sealing grooves 2042. A connecting bracket 2044 is fixed on the through tube 2041. An oil outlet hole 2045 is also provided on the ball cylinder in the middle of the roller 204. An oil outlet adjusting plate 2046 and an adjusting rod 2047 are also provided inside the half-rollers. The bottom end of the vertical rod of the oil outlet adjusting plate 2046 has a circular structure and is movably inserted into... The oil outlet 2045 has one-fifth of the circular structure at the bottom of the vertical rod protruding from it. One end of the adjusting rod 2047 is movably inserted into the movable hole on the connecting frame 2044, and the other end is fitted with a spring and screwed into the circular plate on the oil outlet adjusting plate 2046. The ball cylinder in the middle of the roller 204 is respectively attached to the outer ball groove 102 and the inner ball groove 404. The cylinders on both sides of the roller 204 are respectively attached to the outer wall of the inner ring 1 and the inner wall of the outer ring 4. When the roller 204 rotates with the inner ring 1, the circular structure at the bottom of the vertical rod on the oil outlet adjusting plate 2046 is squeezed by the outer ball groove 102 and the inner ball groove 404 and moves into the roller 204. This causes the lubricating oil inside the roller 204 to flow out through the oil outlet 2045. After the squeezing ends, it automatically returns to its original position under the action of the spring, further lubricating the balls and the roller 204.

[0025] In embodiments of the present invention, such as Figure 3 , Figure 5 , Figure 6 and Figure 8As shown, the semicircular baffle 105 is fitted onto the connecting ring plate 104 via a semicircular slot 1051. A hexagonal socket head cap screw passes through the connecting hole 1052 on the front side of the semicircular baffle 105 and the through hole 1 on the connecting ring plate 104, connecting to the threaded structure within the connecting hole 1052 on the rear side of the semicircular baffle 105. Six sets of oblique holes 1053 are respectively opened on the semicircular baffle 105, and the inner end of each oblique hole 1053 is connected to a duct. The inner arc end of the semicircular ring plate A201 does not contact the inner wall of the intermediate ring groove 101, while the outer arc end contacts the inner wall of the semicircular ring groove A201. The inner wall of 403 does not contact the inner wall of the side ring groove 103, and the outer arc end of the semicircular ring plate B202 does not contact the inner wall of the side ring groove 103, nor does the outer arc end contact the inner wall of the semicircular ring groove B405. During the rotation of the inner ring 1 with the screw drill, the airflow can be blown into the bearing through the inclined hole 1053. The airflow flows inside the bearing through the gaps between the semicircular ring plate B202 and the side ring groove 103 and the semicircular ring groove B405, as well as the gaps between the semicircular ring plate A201 and the middle ring groove 101 and the semicircular ring groove A403, thereby reducing the temperature of the bearing's internal movement.

[0026] In embodiments of the present invention, such as Figure 7 As shown, the biomimetic self-lubricating shock-absorbing composite washer 3 is designed with a "sandwich" structure. The upper and lower layers are pure porous silicon carbide (SiC) ceramic support layers with a thickness of 0.5 mm each, providing excellent high-temperature compressive strength. The middle layer is a porous polyimide (PI) / graphene composite damping layer with a thickness of 0.8 mm. The PI material can maintain excellent mechanical properties at a high temperature of 250℃.

[0027] The specific usage and function of this embodiment are as follows: In this invention, lubricating oil is added inside the semi-roller, and two sets of semi-rollers are joined together to form a roller 204. Then, hexagonal socket bolts are passed sequentially through the through hole 2 on the semi-circular ring plate B202, the hole in the middle of the circular pad 205, and the through tube 2041 on the roller 204, and screwed into the threaded connecting block 2016 for locking. The rubber plug 2012 on the semi-circular ring plate A201 is removed, lubricating oil is added, and then the rubber plug 2012 is reinserted into the opening on the semi-circular ring plate A201. The two sets of semi-ring frames are fitted onto the inner ring 1, and ball bearings are formed by connecting pins 2013 and connecting holes 2014. Frame 2, with two sets of biomimetic self-lubricating shock-absorbing composite washers 3 respectively fitted on both sides of the inner ring 1, the semi-circular baffle 105 fastened to the connecting ring plate 104 through the semi-circular slot 1051, and the hexagonal bolts passing through the connecting hole 1052 on the front side of the semi-circular baffle 105 and the through hole 1 on the connecting ring plate 104, and connected to the threaded structure in the connecting hole 1052 on the rear side of the semi-circular baffle 105, then the two sets of biomimetic self-lubricating shock-absorbing composite washers 3 respectively attached to the inner end of the semi-circular baffle 105, and the two sets of semi-ring plates joined together, and the bolts passing through the through hole 401 and screwed into the threaded hole 402 respectively to fix and form the outer ring 4; During bearing operation, as the inner ring 1 rotates with the screw drill bit, airflow is blown into the bearing through the inclined hole 1053. The airflow flows inside the bearing through the gaps between the semi-circular ring plate B202 and the side ring groove 103 and the semi-circular ring groove B405, as well as the gaps between the semi-circular ring plate A201 and the middle ring groove 101 and the semi-circular ring groove A403, reducing the internal temperature of the bearing. Furthermore, the oil outlet pipe 2015 connects to the ball bearing, and the ball bearing drives the oil ball 20151 to rotate, causing the oil outlet pipe 20151 to rotate. The lubricating oil inside the inner ring 1 flows to the surface of the ball through the oil droplet 20151 to lubricate the ball. When the roller 204 rotates with the inner ring 1, the circular structure at the bottom of the vertical rod on the oil outlet adjusting plate 2046 is squeezed by the outer groove 102 and the inner groove 404 of the ball, and moves into the roller 204. This causes the lubricating oil inside the roller 204 to flow out through the oil outlet hole 2045. After the squeezing ends, it automatically returns to its original position under the action of the spring, further lubricating the ball and the roller 204.

[0028] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0029] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0030] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drill bits, comprising: Inner ring (1), ball cage (2), biomimetic self-lubricating shock-absorbing composite washer (3) and outer ring (4); The inner ring (1) is characterized in that a middle annular groove (101) is provided in the middle of the outer side, and a ball outer groove (102), a side annular groove (103) and a connecting ring plate (104) are provided on both sides of the middle annular groove (101) respectively. Two sets of semi-circular baffles (105) are also inserted into the two outer ends of the inner ring (1). The ball retainer (2) is composed of two sets of semi-ring frames, and the middle and sides of the semi-ring frames are respectively provided with a semi-circular ring plate A (201) and a semi-circular ring plate B (202). The inner side of the semi-circular ring plate A (201) is hollow and is provided with an oil reservoir (2011). The oil filling hole in the middle of the top of the oil reservoir (2011) is plugged with a rubber stopper (2012). One end of the bottom side of the semi-circular ring plate A (201) is connected to a connecting post (201). 3) The other end is provided with a connecting hole (2014), and when the two sets of semi-ring frames are inserted, the connecting pins (2013) are tightly inserted into the connecting hole (2014) respectively. The oil storage tank (2011) of the semi-circular ring plate A (201) is also connected to the oil outlet pipe (2015) on both sides respectively. The semi-ring frame is also provided with an installation port (203), and a roller (204) and a circular pad (205) are installed in the installation port (203) respectively. The outer ring (4) is formed by two sets of semi-ring plates facing each other and connected by bolts. One end of the semi-ring plate is provided with a through hole (401) and the other end is provided with a threaded hole (402). The bolts pass through the through hole (401) and are screwed into the threaded hole (402) for fixation. The inner side of the semi-ring plate is provided with a semi-circular groove A (403). The two sides of the semi-circular groove A (403) are respectively provided with a ball inner groove (404), a semi-circular groove B (405) and a fixed baffle (406). The biomimetic self-lubricating shock-absorbing composite gasket (3) is respectively fitted on both sides of the inner ring (1) and attached between the fixed baffle (406) and the semi-circular baffle (105).

2. The high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drills according to claim 1, characterized in that: The semicircular baffle (105) is fitted onto the connecting ring plate (104) through the semicircular slot (1051) on it, and is connected to the threaded structure in the connecting hole (1052) on the front side of the semicircular baffle (105) and the through hole on the connecting ring plate (104) by passing through the connecting hole (1052) on the front side of the semicircular baffle (105) with an internal hexagonal bolt. Six sets of oblique holes (1053) are respectively opened on the semicircular baffle (105), and the inner end of the oblique hole (1053) is connected to the air duct.

3. The high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drills according to claim 1, characterized in that: The L-end of the oil outlet pipe (2015) faces the center of the ball and is fitted with an oil ball (20151) by rotation, and the oil ball (20151) is attached to the outer surface of the ball.

4. The high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drills according to claim 1, characterized in that: A threaded connecting block (2016) is also fixed on the semi-circular ring plate A (201) at a position opposite to the mounting port (203). The threaded connecting block (2016) is fixed by passing through the through hole 2 on the semi-circular ring plate B (202), the hole in the middle of the circular pad (205), and the through tube (2041) on the roller (204) in sequence with an internal hex bolt.

5. The high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drills according to claim 4, characterized in that: The roller (204) is composed of two sets of half rollers in contact, and the outer end of the through tube (2041) in one set of half rollers is inserted into the sleeve at the outer end of the through tube (2041) in the other set of half rollers. The contact surfaces of the two sets of half rollers are respectively provided with sealing grooves (2042), and sealing gaskets (2043) are embedded in the sealing grooves (2042). A connecting frame (2044) is fixed on the through tube (2041), and an oil outlet hole (2045) is also provided on the ball cylinder in the middle of the roller (204).

6. The high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drills according to claim 5, characterized in that: The semi-roller is also equipped with an oil outlet regulating plate (2046) and an regulating rod (2047). The bottom end of the vertical rod of the oil outlet regulating plate (2046) is a circular structure and is movably inserted into the oil outlet hole (2045). One-fifth of the circular structure at the bottom end of the vertical rod protrudes from the oil outlet hole (2045). One end of the regulating rod (2047) is movably inserted into the movable hole on the connecting frame (2044), and the other end is fitted with a spring and screwed into the circular plate on the oil outlet regulating plate (2046) by threads.

7. A high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drills according to claim 5, characterized in that: The ball cylinder in the middle of the roller (204) is respectively attached to the outer ball groove (102) and the inner ball groove (404), and the cylinders on both sides of the roller (204) are respectively attached to the outer wall of the inner ring (1) and the inner wall of the outer ring (4).

8. The high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drills according to claim 1, characterized in that: The inner arc end of the semicircular ring plate A (201) does not contact the inner wall of the middle ring groove (101), and the outer arc end does not contact the inner wall of the semicircular ring groove A (403). The inner arc end of the semicircular ring plate B (202) does not contact the inner wall of the side ring groove (103), and the outer arc end does not contact the inner wall of the semicircular ring groove B (405).

9. A high-load-bearing self-lubricating thrust bearing for offshore oil and gas field screw drills according to claim 1, characterized in that: The biomimetic self-lubricating shock-absorbing composite gasket (3) is designed as a "sandwich" structure, with the upper and lower layers being pure porous silicon carbide (SiC) ceramic support layers with a thickness of 0.5 mm each, and the middle layer being a porous polyimide (PI) / graphene composite damping layer with a thickness of 0.8 mm.

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