Dynamic sealing device for continuous casting equipment in high-temperature and high-pressure environment

Abstract

The invention relates to the technical field of continuous casting equipment, and discloses a dynamic sealing device for continuous casting equipment in a high-temperature and high-pressure environment, which comprises a bearing seat, an end cover II, a bearing, a roll shaft, an extension pipe, a transmission sleeve, a boss, an end ring, a baffle ring I, a baffle ring II, a baffle ring III and a reducer pipe, the baffle ring I and the baffle ring II extend into an area between the baffle ring I and the baffle ring II; an oil pushing sleeve sleeves the outer circumferential surface of the transmission sleeve positioned in the extension pipe, and a sealing structure is formed between the oil pushing sleeve and the extension pipe; the oil pushing sleeve can axially reciprocate; according to the device, three layers of progressive defense lines are formed through the three lubricating oil containing spaces, so that the possibility that impurities directly pollute lubricating oil around the bearing is greatly reduced, and the impurities and the lubricating oil polluted by the impurities can be actively pumped out of the device; effective isolation of lubricating oil around the bearing from lubricating oil located in a space communicating with the external environment is achieved.

Description

Technical Field

[0001] This invention relates to the field of continuous casting equipment technology, specifically a dynamic sealing device for continuous casting equipment under high temperature and high pressure conditions. Background Technology

[0002] Bearing failure is a major cause of unplanned downtime in continuous casting machines, with most failures stemming from lubricant contamination or leakage due to seal failure. While lubricant leakage can be determined by directly observing oil traces in the sealing gaps, lubricant contamination requires periodic inspection through the inspection hole, which is inconvenient. Furthermore, the presence of contaminated lubricant often indicates that the bearing has already worn down due to the contaminant. Therefore, reducing the correlation between lubricant contamination and bearing wear is a problem that needs to be addressed. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a dynamic sealing device for continuous casting equipment under high temperature and high pressure conditions, which can effectively solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a dynamic sealing device for continuous casting equipment under high temperature and high pressure environment, comprising a bearing housing, an end cover, a bearing, and a roller, one end of the roller being installed in the bearing housing via a bearing; End cap 2 is installed on one end of bearing housing and has a central hole thereon; the other end of roller shaft extends out of end cap 2 through the central hole thereon. The end cap 2, away from the positioning ring, has an integrally formed extension tube. A transmission sleeve is fitted on the outer circumferential surface of the roller outside the end cap 2. One end of the transmission sleeve extends into the extension tube, and the other end extends to the outside of the extension tube, with a boss integrally formed on its outer circumferential surface. The end cap 2, away from the extension tube, has an end ring, which is fixedly connected to the end cap 2 by bolts. A retaining ring 1 and a retaining ring 2 are integrally formed on the outer circumferential surface of the boss, with the retaining ring 2 located on the side away from the extension tube. A retaining ring three is integrally formed on the inner circumference of the end ring; the retaining ring three is rotatably sleeved on the outer circumference of the retaining ring two, and together they form a dynamic seal; a reducing pipe is fixed to one end of the retaining ring three facing the bearing, and the other end of the reducing pipe has a gradually decreasing diameter and extends into the area between the retaining ring one and the retaining ring two. An oil-pushing sleeve is fitted on the outer circumference of the transmission sleeve located inside the extension tube, and a sealing structure is formed between the oil-pushing sleeve and the extension tube; the oil-pushing sleeve can move axially back and forth.

[0005] Preferably, the bearing housing has an oil injection hole at the top, which is connected to the lubrication oil passage on the bearing; an oil plug is screwed into the oil injection hole, and the oil plug extends to the outside of the bearing housing.

[0006] Preferably, gaps are left between the reducing pipe and the retaining ring, and between the reducing pipe and the boss; the areas between the oil pusher sleeve and the boss, and between the end ring and the boss, are filled with lubricating oil; the end ring has an airbag mounting cavity, which is connected to the area between the end ring and the reducing pipe; and an airbag is installed in the airbag mounting cavity.

[0007] Preferably, the end of the pusher sleeve away from the bearing is open and can reciprocate in and out of the area between the end ring and the reducer; by the reciprocating movement of the pusher sleeve in and out of the area between the end ring and the reducer, the oil pressure between the end ring and the reducer, as well as between the reducer and the boss, is alternately increased and decreased, ultimately forming a positive pressure seal between the retaining ring three and the retaining ring two.

[0008] Preferably, the size of the area between the reducer and the end ring is dynamically adjusted by the elastic deformation of the airbag, thereby achieving dynamic adjustment of the oil pressure between the reducer and the boss.

[0009] Preferably, the pusher sleeve is provided with an oil guide channel, which is used to guide lubricating oil from the area between the pusher sleeve and the bearing to the area between the pusher sleeve and the boss.

[0010] Preferably, a switching structure and a knob are provided between the extension tube and the pusher sleeve; the switching structure and the knob work together to control the opening and closing of the oil guide channel.

[0011] Preferably, the switching structure includes a slot frame, a spring, and an adjusting column; the slot frame is installed between the extension pipe and the oil pusher sleeve, the spring is radially installed inside the oil pusher sleeve, and one end of the spring is fixedly connected to the slot frame and the other end is fixedly connected to the adjusting column; the other end of the adjusting column has a contractile structure and can be plugged into the oil guide channel.

[0012] Preferably, knob one is screwed onto the extension tube, with one end of knob one extending to the outside of the extension tube and the other end embedded in the T-shaped groove in the slot frame.

[0013] Preferably, the groove frame can move radially along the oil pusher sleeve when the knob is rotated, and can also move axially with the oil pusher sleeve.

[0014] Compared with the prior art, the present invention provides a dynamic sealing device for continuous casting equipment under high temperature and high pressure environment, which has the following beneficial effects: 1. A space for accommodating bearings and lubricating oil is formed by the roller shaft, bearing housing, end cover one, end cover two, extension cylinder, transmission sleeve, and oil pusher sleeve; a space for accommodating lubricating oil is formed by the oil pusher sleeve, transmission sleeve, and boss; a space for accommodating lubricating oil is formed by the boss, end ring, retaining ring one, retaining ring two, and end ring three; a dynamic seal is formed between retaining ring two and retaining ring three, and the gap between them is the only way for impurities from the external environment to enter the interior of the device; Space 3 is connected to the external environment through a gap. Space 3 and Space 2 are connected through the gap between the oil pusher sleeve and the retaining ring 1. Space 2 and Space 1 are connected through the oil guide channel on the oil pusher sleeve. This ensures that impurities entering the device must pass through Space 3 and Space 2 before contaminating the lubricating oil in Space 1. This creates three progressively stronger defenses in the three spaces, greatly reducing the possibility of impurities directly contaminating the lubricating oil around the bearing.

[0015] 2. In addition, by installing a reducing pipe on the retaining ring, with the smaller end of the reducing pipe extending between retaining ring one and end ring two, and gaps are left between the reducing pipe and retaining ring one, and between the reducing pipe and the boss; the reducing pipe separates space three, making it easier for impurities entering the device to accumulate between the reducing pipe and the boss; and by enabling the oil pusher sleeve to reciprocate in and out of the area between the reducing pipe and the end ring, the oil pressure in the area between the end ring and the boss can be periodically increased or decreased, and when the oil pressure increases, it can have a pumping effect, pumping out impurities in the area between the reducing pipe and the boss, thus actively cleaning impurities, which further reduces the possibility of impurities directly contaminating the lubricating oil around the bearing.

[0016] 3. Therefore, by setting up three lubricating oil containing spaces and creating a pumping effect in the space connected to the external environment, this device actively pumps impurities and lubricating oil contaminated by impurities out of the device. This effectively isolates the lubricating oil around the bearing from the lubricating oil in the space connected to the external environment, avoiding direct contamination of the lubricating oil around the bearing by impurities. It also effectively reduces the correlation between lubricating oil contamination and bearing wear, thus improving the overall lubrication effect of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of impeller one and impeller two; Figure 4 This is a cross-sectional view of the water-cooled flow channel; Figure 5 This is a structural development diagram of the transmission sleeve, the oil pusher sleeve, and the end ring. Figure 6 A schematic diagram showing the fit between the extension tube, knob 1, oil pusher sleeve, and switching structure; Figure 7 This is a schematic diagram of the drive slot structure.

[0018] The components include: 1. Bearing housing; 2. Positioning ring; 3. End cover one; 4. End cover two; 5. Bearing; 6. Roller shaft; 7. Impeller one; 8. End face gear; 9. Impeller two; 10. Circulation hole; 11. Extension tube; 12. Transmission sleeve; 13. Oil pusher sleeve; 14. End ring; 15. Switching structure; 16. Knob one; 17. Oil injection hole; 18. Oil plug; 19. Hole plug; 20. Drive ball; 21. Drive groove; 22. Knob two; 23. Water cooling channel. 24. Pipe joint one; 25. Pipe joint two; 71. Blade one; 72. Blade two; 91. Blade three; 92. Blade four; 111. Slide groove; 121. Retaining ring one; 122. Retaining ring two; 131. Mounting hole; 132. Mounting groove; 133. Oil guide hole one; 134. Oil guide hole two; 141. Retaining ring three; 142. Connecting ring; 143. Reducer; 145. Airbag; 151. Groove frame; 152. Spring; 153. Adjusting column. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 7 This embodiment describes a dynamic sealing device for continuous casting equipment under high temperature and high pressure conditions, comprising a bearing housing 1, an end cover 3, an end cover 4, a bearing 5, and a roller 6.

[0021] A locating ring 2 is integrally formed on the inner circumferential surface of the bearing housing 1. The two axial ends of the locating ring 2 abut against end cap 3 and end cap 4 respectively, and end cap 3 and end cap 4 form a sealing structure with the locating ring 2. End cap 3 and end cap 4 are fixed to the two ends of the bearing housing 1 by bolts, and end cap 4 is provided with a central hole.

[0022] The bearing 5 is embedded in the inner circumferential surface of the positioning ring 2. One end of the roller 6 is installed in the bearing housing 1 through the bearing 5, and the other end extends to the outside of the end cover 4 through the center hole on the end cover 4.

[0023] The bearing housing 1 has an oil injection hole 17 at its top, which passes through the locating ring 2 and connects to the lubrication oil passage on the bearing 5. An oil plug 18 is screwed onto the oil injection hole 17 and extends to the outside of the bearing housing 1. During lubrication, lubricating oil is injected through the oil injection hole 17, which then enters the bearing 5 and the areas on both sides of the bearing 5, thereby achieving lubrication and protection of the bearing 5.

[0024] The positioning ring 2 has an axially penetrating circulation hole 10 inside. An impeller 7 is located between the end cover 3 and the positioning ring 2, and an end-face gear 8 is located between the impeller 7 and the bearing 5. The end-face gear 8 is sleeved on the outer circumferential surface of the roller shaft 6 and is connected to the roller shaft 6 via a keyway. The end-face gear 8 meshes with the impeller 7. When the roller shaft 6 rotates, the impeller 7 rotates synchronously via the end-face gear 8.

[0025] Impeller 7 has blade 71 and blade 72. When impeller 7 rotates, blade 71 draws the lubricating oil between end cover 3 and impeller 7 into bearing 5, and blade 72 draws the lubricating oil in circulation hole 10 into the space between impeller 7 and end cover 3.

[0026] An impeller 9 is provided between the end cover 4 and the positioning ring 2. The impeller 9 is sleeved on the outer circumference of the roller shaft 6 and is connected to the roller shaft 6 via a keyway. When the roller shaft 6 rotates, the impeller 9 rotates synchronously through the keyway.

[0027] Impeller 2 9 has blade 3 91 and blade 4 92 inside; when impeller 2 9 rotates, blade 3 91 pumps the lubricating oil between bearing 5 and impeller 2 9 to between impeller 2 9 and end cover 2 4, and blade 4 92 pumps the lubricating oil between end cover 2 4 and impeller 2 9 to circulation hole 10.

[0028] Furthermore, a water-cooling channel 23 is provided between end cap 3, positioning ring 2, and end cap 4. The inlet and outlet of the water-cooling channel 23 are respectively connected to pipe joint 24 and pipe joint 25. Both pipe joint 24 and pipe joint 25 are screwed onto end cap 3 and are connected to an external water-cooling source for cooling lubricating oil.

[0029] As impeller 1 7 and impeller 2 9 rotate with roller shaft 6, the lubricating oil continuously circulates between bearing 5 area and circulation hole 10. Then, water cooling source is delivered through water cooling channel 23 to achieve active and efficient heat dissipation of lubricating oil and enhance high temperature resistance.

[0030] As a further explanation of the above technical solution, a knob 22 is also installed on the end cover 3; the knob 22 is screwed onto the end cover 3, with one end extending to the outside of the end cover 3, and the other end coaxially passing through and rotatably connecting to the impeller 7. By rotating the knob 22, the axial movement of the impeller 7 relative to the end face gear 8 is controlled, thereby controlling whether the impeller 7 and the end face gear 8 are meshed.

[0031] It should be noted that knob 22 is coupled to impeller 7 via a spring-loaded latch. This connection allows impeller 7 to rotate circumferentially on knob 22 while ensuring that impeller 7 remains axially stationary relative to knob 22.

[0032] As a further explanation of the above technical solution, the end cap 4, away from the positioning ring 2, has an integrally formed extension tube 11. A transmission sleeve 12 is fitted onto the outer circumferential surface of the roller 6 outside the end cap 4. The transmission sleeve 12 is connected to the roller 6 via a keyway, allowing the transmission sleeve 12 to rotate synchronously with the roller 6. One end of the transmission sleeve 12 extends into the extension tube 11, and a wave-shaped drive groove 21 is formed on its outer circumferential surface. The other end extends to the outside of the extension tube 11, and a boss is integrally formed on its outer circumferential surface. An end ring 14 is provided at the end of the end cap 4 away from the extension tube 11, and the end ring 14 is fixedly connected to the end cap 4 by bolts.

[0033] A retaining ring 121 and a retaining ring 122 are integrally formed on the outer circumference of the boss, with retaining ring 122 located on the side away from the extension tube 11. A retaining ring 141 is integrally formed on the inner circumference of the end ring 14. Retaining ring 141 is fitted onto the outer circumference of retaining ring 122, and retaining ring 141 and retaining ring 122 are rotatably engaged to form a dynamic seal.

[0034] A connecting ring 142 is coaxially fixed to one end of the bearing 5 facing upwards from the retaining ring 3 141. A reducing tube 143 is integrally formed at the end of the connecting ring 142 away from the retaining ring 3 141. The other end of the reducing tube 143 gradually narrows in diameter and extends into the area between the retaining ring 1 121 and the retaining ring 2 122. Gaps are provided between the reducing tube 143 and the retaining ring 1 121, and between the reducing tube 143 and the boss.

[0035] An oil-pushing sleeve 13 is fitted on the outer circumference of the transmission sleeve 12 located inside the extension tube 11. The oil-pushing sleeve 13 and the extension tube 11 form an axial sliding connection structure, and a sealing structure is formed between the oil-pushing sleeve 13 and the extension tube 11.

[0036] The drive groove 21 is provided with a drive ball 20, which is fixed to the oil pusher sleeve 13.

[0037] When the roller 6 rotates, it drives the transmission sleeve 12 to rotate through the keyway. The transmission sleeve 12 pushes the oil-pushing sleeve 13 to move axially back and forth with the help of the drive groove 21 and the drive ball 20.

[0038] Furthermore, the end of the oil pusher sleeve 13 furthest from the bearing 5 is open and can reciprocate in and out of the area between the end ring 14 and the reducer 143. The areas between the oil pusher sleeve 13 and the boss, and between the end ring 14 and the boss, are filled with lubricating oil.

[0039] By reciprocating axially with the pusher sleeve 13 and moving in and out of the area between the end ring 14 and the reducer 143, the area between the pusher sleeve 13 and the boss is repeatedly reduced and reset, and the area between the end ring 14 and the reducer 143 is periodically reduced and reset. This results in alternating increases and decreases in oil pressure between the end ring 14 and the reducer 143, and between the reducer 143 and the boss, ultimately forming a positive pressure seal between the retaining ring 3 141 and the retaining ring 2 122.

[0040] A dynamic sealing mechanism is formed by positive pressure sealing combined with dynamic sealing between retaining ring 141 and retaining ring 122. This mechanism, which combines liquid sealing and mechanical sealing, replaces traditional rubber elastic seals, thus providing better high-temperature and high-pressure resistance.

[0041] Meanwhile, since the area between the reducing pipe 143 and the boss is connected to the external environment through the gap between the second retaining ring 122 and the third retaining ring 141, and this gap is the only way for impurities in the external environment to enter the device, when pressure is applied to the hydraulic oil between the reducing pipe 143 and the boss periodically, it can have a pumping effect, pumping out the impurities in the area between the reducing pipe 143 and the boss, thus achieving the effect of actively cleaning impurities.

[0042] Furthermore, through the cooperation of the reducing pipe 143 and the retaining ring 122, and combined with the positive pressure applied between the reducing pipe 143 and the boss by the axial movement of the oil pusher sleeve 13, impurities between the reducing pipe 143 and the boss can be effectively prevented from entering the area between the reducing pipe 143 and the end ring 14, forming the first isolation against impurities entering the device; by separating the area where the bearing 5 is located from the area between the reducing pipe 143 and the boss by the oil pusher sleeve 13, a second isolation is formed in the device, thereby effectively preventing impurities entering the device from contaminating the lubricating oil around the bearing 5, thus avoiding the situation where lubricating oil contamination means that the bearing 5 will wear due to contaminants.

[0043] Furthermore, to control the oil pressure between the end ring 14 and the boss within a suitable range, and to prevent excessive lubricating oil from being pumped out from the gap between the second retaining ring 122 and the third retaining ring 141 during a single reciprocating movement of the oil pusher sleeve 13, thus extending the effect of actively cleaning impurities, the end ring 14 is provided with an airbag mounting cavity, which is connected to the area between the end ring 14 and the reducer 143. An airbag 145 is provided within the airbag mounting cavity. The elastic deformation of the airbag 145 dynamically adjusts the size of the area between the reducer 143 and the end ring 14, thereby dynamically adjusting the lubricating oil capacity and, consequently, dynamically adjusting the oil pressure between the reducer 143 and the boss.

[0044] As a further explanation of the above technical solution, in actual use, the gap between retaining ring 2 122 and retaining ring 3 141 may eventually result in no lubricating oil being pumped out, leading to contamination of the lubricating oil in the area between the oil pusher sleeve 13 and the boss. Therefore, the lubricating oil in the area between the oil pusher sleeve 13 and the boss needs to be replenishable and replaceable. Based on the above, the device also has the following configuration.

[0045] First, the extension tube 11 is provided with an observation hole, which connects to the area between the oil pusher sleeve 13 and the boss. A plug 19 is screwed into the observation hole, extending to the outside of the extension tube 11. When it is necessary to check the condition of the lubricating oil in the area between the oil pusher sleeve 13 and the boss, the plug 19 can be loosened to allow some lubricating oil to flow out through the gap between the plug 19 and the observation hole. The color of the flowing lubricating oil can be observed to determine whether the lubricating oil is contaminated. If the lubricating oil in the area between the oil pusher sleeve 13 and the boss is contaminated, the plug 19 can be completely removed for oil drainage. After drainage, the plug 19 can be tightened again. If it is not contaminated, the plug 19 can be tightened directly.

[0046] Secondly, the pusher sleeve 13 is provided with an oil guide channel. The oil guide channel is used to guide lubricating oil from the area between the pusher sleeve 13 and the bearing 5 to the area between the pusher sleeve 13 and the boss. A switching structure 15 and a knob 16 are provided between the extension tube 11 and the pusher sleeve 13. The switching structure 15 and the knob 16 work together to control the opening and closing of the oil guide channel.

[0047] The oil guide channel includes mounting hole 131, oil guide hole one 133 and oil guide hole two 134.

[0048] The mounting hole 131 is radially opened inside the pusher sleeve 13, and the first oil guide hole 133 and the second oil guide hole 134 are both axially opened inside the pusher sleeve 13. The first oil guide hole 133 penetrates the end of the pusher sleeve 13 facing the bearing 5 and the side wall of the mounting hole 131. The second oil guide hole 134 is located between the mounting hole 131 and the transmission sleeve 12, and connects to the mounting hole 131 and penetrates the end of the pusher sleeve 13 facing the boss.

[0049] The switching structure 15 includes a slot frame 151, a spring 152, and an adjusting column 153.

[0050] Spring 152 is located in mounting hole 131. One end of spring 152 is fixedly connected to adjusting post 153. The other end of adjusting post 153 has a retractable structure and can be inserted into oil guide hole 134. The other end of spring 152 is fixedly connected to slot bracket 151.

[0051] Knob 16 is screwed onto extension tube 11, with one end of knob 16 extending to the outside of extension tube 11 and the other end embedded in the T-shaped groove in slot frame 151.

[0052] An axial groove 111 is formed on the inner circumferential surface of the extension tube 11, and an axial mounting groove 132 is formed on the outer circumferential surface of the oil pusher sleeve 13 at a position corresponding to the groove 111. The mounting groove 132 communicates with the mounting hole 131. The slot frame 151 is disposed in the mounting groove 132 and the groove 111, and can move radially along the oil pusher sleeve 13 when the knob 16 is rotated, and can also slide in the groove 111 as the oil pusher sleeve 13 moves axially.

[0053] When knob 16 is screwed into place, spring 152 is compressed, and the adjusting pin 153 is tightly pressed against the connection between mounting hole 131 and oil guide hole 134, thereby separating mounting hole 131 and oil guide hole 134 and disconnecting the oil guide channel. At this time, during the reciprocating axial movement of the oil pusher sleeve 13, the lubricating oil on both sides of the oil pusher sleeve 13 will not flow relative to each other.

[0054] When knob 16 is rotated outward, spring 152 is reset to its initial state, and lubricating oil is injected into the area where bearing 5 is located through oil injection hole 17. As the oil pusher sleeve 13 moves axially back and forth, the adjusting column 153 moves radially back and forth under the action of spring 152 and oil pressure, so that mounting hole 131 and oil guide hole 134 are periodically connected and disconnected, so that lubricating oil flows from the area between bearing 5 and oil pusher sleeve 13 to the area between oil pusher sleeve 13 and boss, thereby realizing the replenishment and replacement of lubricating oil.

[0055] It should be noted that the knob 16 is engaged with the T-shaped groove on the slot frame 151 by its elastic latch. This connection method allows the knob 16 to rotate relative to the slot frame 151 and drive the slot frame 151 to move radially during rotation, thereby adjusting the length of the spring 152; it also allows the slot frame 151 to move axially with the oil pusher sleeve 13 and move relative to the knob 16 during axial movement.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dynamic sealing device for continuous casting equipment under high temperature and high pressure environment, comprising a bearing seat (1), a bearing (5) and a roller shaft (6), one end of the roller shaft (6) is installed in the bearing seat (1) through the bearing (5); characterized in that: Further comprising end cover two (4); the end cover two (4) is installed at one end of the bearing seat (1), and a central hole is formed on the end cover two (4); the other end of the roller shaft (6) extends to the outside of the end cover two (4) through the central hole on the end cover two (4); The end cover two (4) is integrally formed with an extension pipe (11) at one end away from the positioning ring (2), a transmission sleeve (12) is sleeved on the outer circumferential surface of the roller shaft (6) outside the end cover two (4); one end of the transmission sleeve (12) extends into the extension pipe (11), the other end extends to the outside of the extension pipe (11) and is integrally formed with a ring of bosses on the outer circumferential surface; an end ring (14) is arranged at one end of the end cover two (4) away from the extension pipe (11), the end ring (14) is fixedly connected with the end cover two (4) through bolts; a ring of blocking rings one (121) and a ring of blocking rings two (122) are integrally formed on the outer circumferential surface of the bosses, and the ring of blocking rings two (122) is located at one side away from the extension pipe (11); The inner circumferential surface of the end ring (14) is integrally formed with a ring of blocking rings three (141); the ring of blocking rings three (141) is rotatably sleeved on the outer circumferential surface of the ring of blocking rings two (122) and forms a dynamic seal together; the ring of blocking rings three (141) is fixedly connected with a reducing pipe (143) at one end facing the upper bearing (5), the other end of the reducing pipe (143) is gradually reduced in diameter and extends into the area between the ring of blocking rings one (121) and the ring of blocking rings two (122); The outer circumferential surface of the transmission sleeve (12) located in the extension pipe (11) is sleeved with a oil pushing sleeve (13), and a sealed structure is formed between the oil pushing sleeve (13) and the extension pipe (11); the oil pushing sleeve (13) can axially reciprocate.

2. The dynamic sealing device for continuous casting equipment under high temperature and high pressure environment according to claim 1, characterized in that: The top of the bearing seat (1) is provided with an oil injection hole (17), and the oil injection hole (17) is in communication with the lubricating oil channel on the bearing (5); the oil injection hole (17) is rotatably connected with an oil plug (18), and the oil plug (18) extends to the outside of the bearing seat (1).

3. The dynamic sealing device for continuous casting equipment under high temperature and high pressure environment according to claim 1, characterized in that: The reducing pipe (143) and the ring of blocking rings one (121) are spaced apart, and the reducing pipe (143) and the bosses are also spaced apart; the area between the oil pushing sleeve (13) and the bosses and the area between the end ring (14) and the bosses are filled with lubricating oil; the end ring (14) is provided with an air bag mounting cavity, and the air bag mounting cavity is in communication with the area between the end ring (14) and the reducing pipe (143); the air bag mounting cavity is provided with an air bag (145).

4. The dynamic sealing device for continuous casting equipment under high temperature and high pressure environment according to claim 3, characterized in that: The end of the oil pushing sleeve (13) away from the bearing (5) is in an open structure, and can reciprocate in and out of the area between the end ring (14) and the reducing pipe (143); by reciprocating the oil pushing sleeve (13) in and out of the area between the end ring (14) and the reducing pipe (143), the oil pressure between the end ring (14) and the reducing pipe (143) and between the reducing pipe (143) and the bosses is alternately increased and decreased, and finally a positive pressure seal is formed between the ring of blocking rings three (141) and the ring of blocking rings two (122).

5. The dynamic sealing device for continuous casting equipment under high temperature and high pressure environment according to claim 4, characterized in that: The size of the area between the reducing pipe (143) and the end ring (14) is dynamically adjusted by the elastic deformation of the air bag (145), and the oil pressure between the reducing pipe (143) and the bosses is dynamically adjusted.

6. The dynamic sealing device for continuous casting equipment under high temperature and high pressure environment according to claim 5, characterized in that: The oil pushing sleeve (13) is internally provided with an oil guiding channel, which is used to guide the lubricating oil from the area between the oil pushing sleeve (13) and the bearing (5) to the area between the oil pushing sleeve (13) and the boss.

7. The dynamic sealing device for continuous casting equipment under high temperature and high pressure environment according to claim 6, characterized in that: The switching structure (15) and the knob one (16) are provided between the extension pipe (11) and the oil pushing sleeve (13), and are used to control the on-off of the oil guiding channel.

8. The dynamic sealing device for continuous casting equipment under high temperature and high pressure environment according to claim 7, characterized in that: The switching structure (15) comprises a groove frame (151), a spring (152) and an adjusting column (153). The groove frame (151) is installed between the extension pipe (11) and the oil pushing sleeve (13). The spring (152) is radially installed in the oil pushing sleeve (13), and one end of the spring (152) is fixedly connected with the groove frame (151), and the other end is fixedly connected with the adjusting column (153). The other end of the adjusting column (153) is in a contracted structure, and is pluggably embedded in the oil guiding channel.

9. The dynamic sealing device for continuous casting equipment under high temperature and high pressure environment according to claim 8, characterized in that: The knob one (16) is screwed on the extension pipe (11), and one end of the knob one (16) extends to the outside of the extension pipe (11), and the other end is embedded in the T-shaped groove in the groove frame (151).

10. The dynamic sealing device for continuous casting equipment under high temperature and high pressure environment according to claim 9, characterized in that: The groove frame (151) can move along the radial direction of the oil pushing sleeve (13) when the knob one (16) rotates, and can also move axially with the oil pushing sleeve (13).

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