Rotating shaft connecting and sealing device for furnace refining equipment

Abstract

The invention discloses a rotating shaft connecting and sealing device for in-furnace refining equipment, which comprises a metal rotating shaft, a graphite rotating shaft, a first connecting sleeve and a second connecting sleeve, the interiors of the metal rotating shaft and the graphite rotating shaft are hollow, the first connecting sleeve is connected to the outer ring wall of one end of the metal rotating shaft, and the second connecting sleeve is connected to the outer ring wall of the other end of the metal rotating shaft. One end of the first connecting sleeve extends out of the metal rotating shaft and extends in the direction close to the graphite rotating shaft, the second connecting sleeve is connected to the outer ring wall, close to the metal rotating shaft, of the graphite rotating shaft through a connecting assembly, and one end of the graphite rotating shaft is inserted into the first connecting sleeve and abuts against the end of the metal rotating shaft. At the moment, one end of the first connecting sleeve abuts against one end of the second connecting sleeve, and the first connecting sleeve and the second connecting sleeve are connected through a connecting piece. The effect of improving the connection sealing performance of the rotating shaft is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of in-furnace refining, and particularly relates to a rotating shaft connecting sealing device for in-furnace refining equipment. BACKGROUND

[0002] In-furnace refining, commonly known as secondary refining or out-furnace refining, refers to a metallurgical process in which primary refined metal liquid melted in a primary refining furnace (such as a converter or an electric arc furnace) is transferred to another special refining container or furnace, and is subjected to deep purification, accurate adjustment of composition and temperature in an isolated or controllable atmosphere, so as to achieve higher quality requirements. In-furnace refining has the effects of deep removal of impurities, accurate control of composition and homogenization, control of solidification components, and optimization of production rhythm and cost, and is an indispensable key link in modern metallurgical production of high-quality steel, special alloys and non-ferrous metals.

[0003] In-furnace refining equipment is a key equipment in the metallurgical industry, which is used for degassing, desulfurization and other refining treatment of metal melt. The rotating shaft is a power transmission component of the stirring or tilting mechanism, and the sealing performance between the rotating shaft and the equipment shell directly affects the production safety and efficiency. At present, the high temperature, high pressure and corrosive medium environment have put forward very high requirements for sealing technology, and the traditional sealing method is difficult to meet the needs of long-term stable operation. In recent years, with the development of metallurgical process towards high efficiency and large scale, sealing technology has become one of the bottlenecks restricting the performance improvement of equipment.

[0004] At present, in order to meet the needs of the refining process, sometimes a metal rotating shaft and a graphite rotating shaft need to be connected in a splicing manner, but the corrosive gas such as chlorine gas is easy to leak at the connection between the metal rotating shaft and the graphite rotating shaft, which affects the safety of the processing process, and therefore there is an urgent need to provide a rotating shaft connecting sealing structure. SUMMARY

[0005] In order to improve the sealing performance of the rotating shaft, the present application provides a rotating shaft connecting sealing device for in-furnace refining equipment.

[0006] The rotating shaft connecting sealing device for in-furnace refining equipment provided by the present application adopts the following technical scheme: The utility model provides a kind of rotary shaft connection sealing device for in-furnace refining equipment, including metal rotary shaft, graphite rotary shaft, first connecting sleeve and second connecting sleeve, the inside of the metal rotary shaft and the graphite rotary shaft is hollow, the first connecting sleeve is connected on the outer ring wall of one end of the metal rotary shaft, one end of the first connecting sleeve extends out of the metal rotary shaft and extends towards the direction close to the graphite rotary shaft, the second connecting sleeve is connected on the outer ring wall of the graphite rotary shaft close to the metal rotary shaft by connecting assembly, one end of the graphite rotary shaft is inserted into the first connecting sleeve and is in abutment with the end of the metal rotary shaft, when one end of the first connecting sleeve and one end of the second connecting sleeve are in abutment, the first connecting sleeve and the second connecting sleeve are connected by connecting piece.

[0007] By adopting the above technical scheme, through the cooperation of the metal rotary shaft, the graphite rotary shaft, the first connecting sleeve and the second connecting sleeve, stable sealing connection of the metal rotary shaft and the graphite rotary shaft connection position is realized, and the effect of improving the rotary shaft connection sealing performance is achieved.

[0008] Optionally, the connecting assembly includes a connecting plug and a connecting arc block, the connecting arc block is provided on the outside of the second connecting sleeve along the circumference, the connecting plug is connected to the inner arc wall of each connecting arc block, the second connecting sleeve is provided with a plurality of installation openings along the circumference, the installation openings and the connecting plugs are one-to-one corresponding and are inserted and matched, the connecting arc block is connected to the second connecting sleeve by the connecting piece, the graphite rotary shaft is provided with a plurality of installation grooves on the circumference, the installation grooves and the installation openings are one-to-one corresponding and are in communication, and the end of the connecting plug is embedded in the corresponding installation groove.

[0009] Optionally, the second connecting sleeve is provided with a centering assembly, the centering assembly includes a centering push rod, a centering wedge block and a first push ring, the centering push rod is slidably inserted into each communication hole along the radial direction of the second connecting sleeve, the end of the centering push rod away from the graphite rotary shaft extends out of the connecting plug and is connected to the centering wedge block, the centering wedge block is provided with a centering inclined surface on the side away from the centering push rod, the first push ring is slidably sleeved on the outside of the second connecting sleeve, the inner ring wall of the end of the first push ring close to the centering wedge block is provided with a first pushing conical surface along the circumference, the first pushing conical surface is in sliding fit with the centering inclined surface, and the second connecting sleeve is provided with a driving piece for driving the first push ring to move along the axial direction.

[0010] Optionally, a contact gasket is embedded in the installation groove, and the contact gasket is made of elastic material.

[0011] Optionally, a sealing ring groove is formed on the inner ring wall of the second connecting sleeve away from the first connecting sleeve in the circumferential direction, a sealing ring bag is connected in the circumferential direction in the sealing ring groove, the sealing ring bag is arranged in fit with the outer peripheral wall of the graphite rotating shaft, a sliding through hole is formed on the second connecting sleeve in the radial direction and is in communication with the sealing ring groove, an extrusion sliding block is slidingly arranged in the sliding through hole, one end of the extrusion sliding block extends into the sealing ring groove and is connected with the sealing ring bag, the other end of the extrusion sliding block extends out of the second connecting sleeve and is provided with an extrusion inclined surface, a second pushing ring is slidingly arranged outside the second connecting sleeve, a second pushing conical surface is arranged on the inner ring wall of the second pushing ring close to one end of the extrusion sliding block in the circumferential direction, the second pushing conical surface is slidingly arranged in fit with the extrusion inclined surface, and a driving member is arranged on the second connecting sleeve for driving the second pushing ring to move in the axial direction thereof.

[0012] Optionally, a first rotating sleeve is rotatably arranged on the second connecting sleeve, an inner thread is arranged on the inner ring wall of the first rotating sleeve, an outer thread is arranged on the outer ring wall of the first pushing ring, the inner thread of the first rotating sleeve is threadedly connected with the outer thread of the first pushing ring, a first limiting sliding block is arranged on the inner ring wall of the first pushing ring, a first limiting sliding groove is formed on the outer ring wall of the second connecting sleeve in the axial direction, the first limiting sliding block is slidingly arranged in the first limiting sliding groove, a second rotating sleeve is coaxially connected to one end of the first rotating sleeve close to the second pushing ring, an inner thread is arranged on the inner ring wall of the second rotating sleeve, an outer thread is arranged on the outer ring wall of the second pushing ring, the inner thread of the second rotating sleeve is threadedly connected with the outer thread of the second pushing ring, and the inner thread of the first rotating sleeve is opposite in rotation direction to the inner thread of the second rotating sleeve.

[0013] Optionally, a polytetrafluoroethylene sealing washer is arranged inside the first connecting sleeve, and the polytetrafluoroethylene sealing washer is clamped between the metal rotating shaft and the end portion of the graphite rotating shaft.

[0014] Optionally, an embedding ring groove is formed on the inner ring wall of the first connecting sleeve in the circumferential direction, and a contact sealing ring is embedded in the embedding ring groove and arranged in fit with the outer ring wall of the graphite rotating shaft.

[0015] Optionally, a hard sealing gasket ring is arranged on the inner end face of the sealing ring groove close to the metal rotating shaft, the hard sealing gasket ring is connected with one side of the sealing ring bag, and the inner ring wall of the hard sealing gasket ring is arranged in fit with the outer ring wall of the graphite rotating shaft.

[0016] In summary, the present application has at least one of the following beneficial technical effects: The mutual cooperation of the metal rotating shaft, the graphite rotating shaft, the first connecting sleeve and the second connecting sleeve realizes the stable and sealed connection of the connecting position of the metal rotating shaft and the graphite rotating shaft, and has the effect of improving the sealing performance of the rotating shaft connection. The arrangement of the centering assembly enables the metal rotating shaft, the graphite rotating shaft and the central shaft of the second connecting sleeve to be coaxially arranged, improves the concentricity of the inner cavity of the metal rotating shaft and the communication position of the graphite rotating shaft, and further improves the sealing performance of the connecting position of the two. The arrangement of the sealing assembly realizes the stable and sealed operation of the connecting position of the second connecting sleeve and the graphite rotating shaft. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of a rotating shaft connection sealing device for an in-furnace refining equipment according to an embodiment of the present application.

[0018] Figure 2 is Figure 1 is an enlarged view of the A part in FIG. 4.

[0019] Figure 3 is a structural schematic view of a connecting assembly according to an embodiment of the present application.

[0020] Figure 4 is a partial sectional view of a centering assembly and a sealing assembly according to an embodiment of the present application.

[0021] Figure 5 is Figure 4 is an enlarged view of the B part in FIG. 5.

[0022] Marked: 1, metal rotating shaft; 2, graphite rotating shaft; 21, mounting groove; 3, first connecting sleeve; 31, lap ring groove; 32, connecting counterbore; 33, embedded ring groove; 4, second connecting sleeve; 41, connecting screw hole; 42, alignment ring; 43, mounting opening; 44, mounting screw hole; 45, first limiting sliding groove; 46, sealing ring groove; 47, sliding through hole; 48, second limiting sliding groove; 5, connecting assembly; 51, connecting arc block; 511, mounting waist-shaped hole; 52, connecting plug; 521, communication opening; 6, sealing assembly; 61, hard sealing gasket ring; 62, sealing ring capsule; 63, extrusion sliding block; 631, extrusion inclined surface; 64, second push ring; 641, second extrusion conical surface; 65, second limiting sliding block; 66, supporting outer ring; 67, limiting outer ring; 7, centering assembly; 71, centering push rod; 72, centering wedge block; 73, first push ring; 731, first pushing conical surface; 74, first limiting sliding block; 75, first rotating sleeve; 76, rotating bearing; 8, contact sealing ring; 9, polytetrafluoroethylene sealing gasket; 10, second rotating sleeve; 11, contact gasket. DETAILED DESCRIPTION

[0023] The following is in conjunction with the appendix Figures 1-5 This application will be further described in detail below. Embodiments of this application provide a shaft connection sealing device for in-furnace refining equipment, which improves the sealing performance of the shaft connection.

[0024] Reference Figures 1-3 A rotating shaft connection sealing device for in-furnace refining equipment includes a metal rotating shaft 1, a graphite rotating shaft 2, a first connecting sleeve 3, a second connecting sleeve 4, a connecting assembly 5, a sealing assembly 6, and an alignment assembly 7. Both the metal rotating shaft 1 and the graphite rotating shaft 2 are hollow, with one end of the metal rotating shaft 1 corresponding to one end of the graphite rotating shaft 2. The first connecting sleeve 3 is connected to the outer annular wall of the metal rotating shaft 1 near the end of the graphite rotating shaft 2, and one end of the first connecting sleeve 3 extends out of the metal rotating shaft 1. Figure 4 The inner annular wall of the first connecting sleeve 3 is provided with an overlapping annular groove 31 along the circumferential direction. Several connecting countersunk holes 32 are provided on the first connecting sleeve 3 along the axial direction.

[0025] Reference Figure 4 The second connecting sleeve 4 is connected to the outer ring wall of the graphite shaft 2 near the metal shaft 1 via the connecting assembly 5. The end of the second connecting sleeve 4 near the metal shaft 1 has several connecting screw holes 41 axially arranged, each corresponding to a countersunk hole 32. The end of the second connecting sleeve 4 near the metal shaft 1 also has a coaxially arranged alignment ring 42 corresponding to the overlapping ring groove 31. One end of the graphite shaft 2 extends into the first connecting sleeve 3 and abuts against one end of the metal shaft 1. At this time, one end of the first connecting sleeve 3 abuts against one end of the second connecting sleeve 4, and bolts for connection are connected to both the countersunk hole 32 and the corresponding connecting screw hole 41.

[0026] Reference Figure 4 An embedded annular groove 33 is provided circumferentially on the inner annular wall of the first connecting sleeve 3. A contact sealing ring 8 is connected circumferentially in the embedded annular groove 33, and the contact sealing ring 8 is fitted to the peripheral wall of the graphite rotating shaft 2. A polytetrafluoroethylene (PTFE) sealing gasket 9 is provided in the first connecting sleeve 3, and the PTFE sealing gasket 9 is sandwiched between the ends of the metal rotating shaft 1 and the graphite rotating shaft 2.

[0027] Reference Figure 2 and Figure 3The second connecting sleeve 4 is connected to the graphite shaft 2 via a connecting assembly 5, which includes connecting arc blocks 51 and connecting inserts 52. Several connecting arc blocks 51 are evenly spaced along the circumference of the outer ring wall of the second connecting sleeve 4, and one connecting insert 52 is fixedly connected to the inner arc wall of each connecting arc block 51. Several mounting openings 43 are evenly spaced along the circumference of the second connecting sleeve 4, and each mounting opening 43 corresponds to and is inserted into a connecting insert 52. The connecting arc blocks 51 have mounting oblong holes 511, and the outer ring wall of the second connecting sleeve 4 has corresponding mounting screw holes 44. Bolts for connecting the connecting arc blocks 51 and the second connecting sleeve 4 are connected to both the mounting screw holes 44 and the corresponding mounting oblong holes 511.

[0028] Reference Figure 3 and Figure 4 The graphite shaft 2 has several mounting grooves 21 arranged circumferentially on its outer peripheral wall. The mounting grooves 21 correspond one-to-one with the mounting openings 43 and are connected to each other. A contact pad 11 is connected to the inner bottom wall of the mounting groove 21. One end of the connecting block 52 extends into the corresponding mounting groove 21. The contact pad 11 is made of elastic material.

[0029] Reference Figure 2 and Figure 4 The centering component 7 is mounted on the second connecting sleeve 4. The centering component 7 includes a centering push rod 71, a centering wedge 72, a first push ring 73, a first limiting slider 74, a first rotating sleeve 75, and a rotating bearing 76. Each connecting insert 52 has a through hole 521 extending along the radial direction of the second connecting sleeve 4. A centering push rod 71 is slidably mounted in each through hole 521. One end of the centering push rod 71 extends out of the connecting insert 52 and is connected to a centering wedge 72. The end of the centering wedge 72 away from the centering push rod 71 has a centering inclined surface. The first push ring 73 is coaxially sleeved on the outside of the second connecting sleeve 4. Several first limiting sliders 74 are circumferentially connected on the inner ring wall of the first push ring 73. Several first limiting grooves 45 are axially formed on the outer ring wall of the second connecting sleeve 4. The several first limiting sliders 74 correspond one-to-one with the several first limiting grooves 45 and are slidably connected. The inner ring wall of the first push ring 73 near the centering wedge 72 is provided with a first push cone surface 731 along the circumferential direction, which corresponds to the shape of the centering inclined surface. The first push cone surface 731 is slidably attached to the centering inclined surfaces of the several centering wedges 72.

[0030] Reference Figure 4A rotating bearing 76 is disposed on the outer annular wall of the second connecting sleeve 4. One end of the first rotating sleeve 75 is coaxially rotatably connected to the outside of the second connecting sleeve 4 via the rotating bearing 76. One end of the first rotating sleeve 75 extends toward the metal rotating shaft 1. An internal thread is provided on the inner annular wall of the first rotating sleeve 75, and an external thread is provided on the outer annular wall of the first push ring 73. The internal thread of the first rotating sleeve 75 is threadedly connected to the external thread of the first push ring 73.

[0031] Reference Figure 4 and Figure 5 A sealing assembly 6 is disposed on the second connecting sleeve 4. The sealing assembly 6 includes a rigid sealing gasket 61, a sealing ring bladder 62, a compression slider 63, a second push ring 64, a second limiting slider 65, a supporting outer ring 66, and a limiting outer ring 67. A sealing ring groove 46 is formed circumferentially on the inner ring wall of the end of the second connecting sleeve 4 away from the metal rotating shaft 1. The rigid sealing gasket 61 is disposed on the inner end wall of the sealing ring groove 46 near the metal rotating shaft 1. The sealing ring bladder 62 is disposed circumferentially in the sealing ring groove 46 and connected to one side of the rigid sealing gasket 61. The supporting outer ring 66 is coaxially connected to the end of the second connecting sleeve 4 away from the metal rotating shaft 1. The inner diameter of the supporting outer ring 66 is equal to the inner diameter of the second connecting sleeve 4, and the outer diameter of the supporting outer ring 66 is larger than the outer diameter of the second connecting sleeve 4. The limiting outer ring 67 is coaxially fixedly connected to the side of the supporting outer ring 66 near the metal rotating shaft 1, and the inner ring wall of the limiting outer ring 67 is spaced apart from the outer ring wall of the second connecting sleeve 4.

[0032] Reference Figure 4 and Figure 5 The second connecting sleeve 4 has several sliding through holes 47 along its radial direction, one end of which is connected to the sealing ring groove 46. A pressing slider 63 is slidably disposed in each sliding through hole 47, one end of which extends into the sealing ring groove 46 and connects to the sealing ring bladder 62. A pressing inclined surface 631 is provided at the end of the pressing slider 63 extending out of the second connecting sleeve 4 away from the sealing ring bladder 62. A second push ring 64 is coaxially sleeved on the outside of the second connecting sleeve 4, and several second limiting sliders 65 are circumferentially connected to the inner ring wall of the second push ring 64. Several second limiting grooves 48 are axially formed on the outer ring wall of the second connecting sleeve 4, and the several second limiting sliders 65 correspond one-to-one with the several second limiting grooves 48 and are slidably connected. The second push ring 64 has a second extrusion cone surface 641 circumferentially formed on the inner ring wall near the extrusion slider 63. The second extrusion cone surface 641 is slidably attached to the extrusion inclined surfaces 631 of a plurality of extrusion sliders 63.

[0033] Reference Figure 5The first rotating sleeve 75, located away from the metal shaft 1, is coaxially fixedly connected to a second rotating sleeve 10. The inner ring wall of the second rotating sleeve 10 has an internal thread, and the outer ring wall of the second push ring 64 has an external thread. The internal thread of the second rotating sleeve 10 is threadedly connected to the external thread of the second push ring 64. The threads on the first rotating sleeve 75 and the threads on the second rotating sleeve 10 have opposite directions of rotation.

[0034] Reference Figure 4 When connecting the metal shaft 1 and the graphite shaft 2, the connecting plug 52 is first passed through the mounting opening 43 into the second connecting sleeve 4, and the end of the connecting plug 52 is embedded in the corresponding mounting groove 21. The mounting groove 21 and the connecting plug 52 achieve a stable connection between the second connecting sleeve 4 and the graphite shaft 2, reducing the possibility of relative rotation between the second connecting sleeve 4 and the graphite shaft 2 during use. The contact pad 11 reduces the possibility of damage and deformation of the inner wall of the mounting groove 21 during contact with the connecting plug 52, and also fills the gap between the two, reducing the possibility of corrosive gas escaping from the gap. One end of the graphite shaft 2 is inserted into the first connecting sleeve 3, and a bolt is passed through the corresponding connecting countersunk hole 32 and connecting screw hole 41 to achieve a detachable connection between the first connecting sleeve 3 and the second connecting sleeve 4.

[0035] Reference Figure 4 A polytetrafluoroethylene (PTFE) sealing gasket 9 is sandwiched between the ends of the metal shaft 1 and the graphite shaft 2, and a contact sealing ring 8 is in close contact with the outer ring wall of the graphite shaft 2. The PTFE sealing gasket 9 and the contact sealing ring 8 achieve a sealing operation at the connection between the metal shaft 1 and the graphite shaft 2, reducing the possibility of corrosive gases leaking from the connection.

[0036] Reference Figure 3 and Figure 4 After the connection between the first connecting sleeve 3 and the second connecting sleeve 4 is completed, the first rotating sleeve 75 is rotated. Under the drive of the first rotating sleeve 75 and the limiting and guiding action of the first limiting slider 74 and the first limiting groove 45, the first push ring 73 moves towards the metal rotating shaft 1. The first pushing cone surface 731 of the first push ring 73 slides relative to the centering inclined surface of the centering wedge block 72. The centering push rod 71 moves synchronously towards the graphite rotating shaft 2 as it is pushed, so that the graphite rotating shaft 2 can be collinear with the central axis of the second connecting sleeve 4 and the metal rotating shaft 1. This improves the coaxiality of the inner hole of the metal rotating shaft 1 and the inner hole of the graphite rotating shaft 2, and further improves the sealing performance at the alignment connection between the two.

[0037] Reference Figure 4 and Figure 5Simultaneously, the second rotating sleeve 10 rotates synchronously with the first rotating sleeve 75. Since the thread direction of the first rotating sleeve 75 is opposite to that of the second rotating sleeve 10, the second push ring 64 moves synchronously away from the first push ring 73 under the drive of the second rotating sleeve 10 and the limiting action of the second limiting slider 65 and the second limiting groove 48. The second pushing cone surface of the second push ring 64 slides relative to the extrusion inclined surface 631 of the extrusion slider 63, and the extrusion slider 63 moves towards the graphite rotating shaft 2 under the pushing action. The extrusion slider 63 extrudes the sealing ring bladder 62 in the sealing ring groove 46, causing its inner wall to expand and tightly fit against the peripheral wall of the graphite rotating shaft 2, further improving the sealing performance of the connection structure. The hard sealing gasket ring 61 is located on the side of the sealing ring bladder 62 near the connection position, reducing the possibility of corrosion of the sealing ring bladder 62 by corrosive gases.

[0038] The implementation principle of the rotating shaft connection sealing device for in-furnace refining equipment in this embodiment is as follows: When connecting the metal rotating shaft 1 and the graphite rotating shaft 2, the connecting plug 52 is first passed through the installation opening 43 into the second connecting sleeve 4, and the end of the connecting plug 52 is embedded in the corresponding installation groove 21. One end of the graphite rotating shaft 2 is inserted into the first connecting sleeve 3, and bolts are used to connect the first connecting sleeve 3 and the second connecting sleeve 4. The polytetrafluoroethylene sealing gasket 9 is sandwiched between the ends of the metal rotating shaft 1 and the graphite rotating shaft 2, and the contact sealing ring 8 is in close contact with the outer ring wall of the graphite rotating shaft 2.

[0039] Rotating the first rotating sleeve 75 causes the first pushing cone surface 731 to slide relative to the centering inclined surface. Several centering push rods 71 ​​move synchronously towards the graphite shaft 2, ensuring that the graphite shaft 2 is collinear with the central axes of the second connecting sleeve 4 and the metal shaft 1, further improving the sealing performance at their alignment connection. Simultaneously, the second rotating sleeve 10 rotates synchronously, causing the second pushing cone surface to slide relative to the extrusion inclined surface 631. The extrusion slider 63 moves and extrudes the sealing ring bladder 62, causing its inner wall to expand and tightly fit against the graphite shaft 2, thus improving the sealing performance of the connection structure.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rotating shaft connection sealing device for in-furnace refining equipment, characterized in that: The device includes a metal shaft (1), a graphite shaft (2), a first connecting sleeve (3), and a second connecting sleeve (4). The interiors of the metal shaft (1) and the graphite shaft (2) are hollow. The first connecting sleeve (3) is connected to the outer ring wall of one end of the metal shaft (1). One end of the first connecting sleeve (3) extends out of the metal shaft (1) and towards the graphite shaft (2). The second connecting sleeve (4) is connected to the outer ring wall of the graphite shaft (2) near the metal shaft (1) via a connecting component (5). One end of the graphite shaft (2) is inserted into the first connecting sleeve (3) and abuts against the end of the metal shaft (1). At this time, one end of the first connecting sleeve (3) abuts against one end of the second connecting sleeve (4). The first connecting sleeve (3) and the second connecting sleeve (4) are connected by a connector.

2. The rotating shaft connection sealing device for in-furnace refining equipment according to claim 1, characterized in that: The connecting component (5) includes a connecting plug (52) and a connecting arc block (51). Several connecting arc blocks (51) are arranged circumferentially on the outside of the second connecting sleeve (4). One connecting plug (52) is connected to the inner arc wall of each connecting arc block (51). Several installation openings (43) are opened circumferentially on the second connecting sleeve (4). Several installation openings (43) correspond one-to-one with several connecting plugs (52) and are inserted into each other. The connecting arc block (51) is connected to the second connecting sleeve (4) through a connector. Several installation grooves (21) are opened on the peripheral wall of the graphite shaft (2). Several installation grooves (21) correspond one-to-one with several installation openings (43) and are connected. The end of the connecting plug (52) is embedded in the corresponding installation groove (21).

3. The rotating shaft connection sealing device for in-furnace refining equipment according to claim 2, characterized in that: The second connecting sleeve (4) is provided with a centering assembly (7), which includes a centering push rod (71), a centering wedge (72), and a first push ring (73). The connecting insert (52) has a through-hole (521) extending along the radial direction of the second connecting sleeve (4). The centering push rod (71) is slidably inserted into each of the through-holes (521). The end of the centering push rod (71) away from the graphite shaft (2) extends out of the connecting insert (52) and is connected to the centering wedge (73). A center wedge (72) is connected. The centering wedge (72) is provided with a centering inclined surface on the side away from the centering push rod (71). The first push ring (73) is slidably sleeved on the outside of the second connecting sleeve (4). The first push ring (73) is provided with a first pushing cone surface (731) circumferentially on the inner ring wall near the centering wedge (72). The first pushing cone surface (731) slides and fits against the centering inclined surface. The second connecting sleeve (4) is provided with a driving member for driving the first push ring (73) to move along its axial direction.

4. The rotating shaft connection sealing device for in-furnace refining equipment according to claim 2, characterized in that: A contact pad (11) is embedded in the mounting groove (21), and the contact pad (11) is made of an elastic material.

5. A shaft connection sealing device for in-furnace refining equipment according to claim 3, characterized in that: The second connecting sleeve (4) has a sealing ring groove (46) circumferentially formed on its inner annular wall away from the first connecting sleeve (3). A sealing ring bladder (62) is circumferentially connected in the sealing ring groove (46). The sealing ring bladder (62) is fitted against the outer peripheral wall of the graphite shaft (2). A sliding through hole (47) communicating with the sealing ring groove (46) is provided on the second connecting sleeve (4) along the radial direction. A pressing slider (63) is slidably arranged in the sliding through hole (47). One end of the pressing slider (63) extends into the graphite shaft (2). The sealing ring groove (46) is connected to the sealing ring bladder (62), and the other end extends out of the second connecting sleeve (4) and is provided with an extrusion inclined surface (631). The second connecting sleeve (4) is slidably fitted with a second push ring (64). The second push ring (64) has a second push cone surface circumferentially arranged on the inner ring wall near the end of the extrusion slider (63). The second push cone surface is slidably fitted with the extrusion inclined surface (631). The second connecting sleeve (4) is provided with a driving member for driving the second push ring (64) to move along its axial direction.

6. The rotating shaft connection sealing device for in-furnace refining equipment according to claim 5, characterized in that: A first rotating sleeve (75) is rotatably sleeved on the second connecting sleeve (4). The inner ring wall of the first rotating sleeve (75) is provided with an internal thread, and the outer ring wall of the first push ring (73) is provided with an external thread. The internal thread of the first rotating sleeve (75) is threadedly connected to the external thread of the first push ring (73). A first limiting slider (74) is provided on the inner ring wall of the first push ring (73). A first limiting groove (45) is axially formed on the outer ring wall of the second connecting sleeve (4). The first limiting slider (74) 74) Slidingly disposed in the first limiting groove (45), the first rotating sleeve (75) is coaxially connected to the second rotating sleeve (10) at one end near the second push ring (64), the inner ring wall of the second rotating sleeve (10) is provided with an internal thread, the outer ring wall of the second push ring (64) is provided with an external thread, the internal thread of the second rotating sleeve (10) is threadedly connected to the external thread of the second push ring (64), and the internal thread of the first rotating sleeve (75) and the internal thread of the second rotating sleeve (10) have opposite directions of rotation.

7. The rotating shaft connection sealing device for in-furnace refining equipment according to claim 1, characterized in that: The first connecting sleeve (3) is provided with a polytetrafluoroethylene sealing gasket (9), which is sandwiched between the ends of the metal shaft (1) and the graphite shaft (2).

8. The rotating shaft connection sealing device for in-furnace refining equipment according to claim 1, characterized in that: The inner ring wall of the first connecting sleeve (3) is provided with an embedded annular groove (33) along the circumferential direction. A contact sealing ring (8) is embedded in the embedded annular groove (33), and the contact sealing ring (8) is fitted to the outer ring wall of the graphite rotating shaft (2).

9. A shaft connection sealing device for in-furnace refining equipment according to claim 5, characterized in that: A hard sealing gasket ring (61) is provided on the inner end face of the sealing ring groove (46) near the metal shaft (1). The hard sealing gasket ring (61) is connected to one side of the sealing ring bladder (62), and the inner ring wall of the hard sealing gasket ring (61) is fitted to the outer ring wall of the graphite shaft (2).

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