Free roller for dry continuous casting

Abstract

This utility model discloses a free roll for dry continuous casting, comprising: two segmented roll units arranged along the same axis; each segmented roll unit comprising: a free roll body, including a mandrel portion, a roll sleeve portion sleeved on the outer side of the mandrel portion, and a cooling inner channel extending through the mandrel portion; an outer cooling outer channel provided on the outer wall of each mandrel portion; a bearing support portion, including a bearing seat body sleeved on the outer side of the mandrel portion and spaced axially, at least one axial end of the bearing seat body being closed and a through cover embedded at the other axial end of the bearing seat body, the bearing seat body and the through cover forming an integral structure; an all-metal sealing unit for sealing the mandrel portion is provided on the inner wall of at least one end of the bearing seat body and the inner wall of the through cover, and a bearing sleeved on the mandrel portion is sealed inside the bearing seat body; a cooling portion, including a cooling water pipe passing through the cooling inner channel; etc. This application can effectively improve the service life.

Description

Technical Field

[0001] This utility model relates to the technical field of equipment for dry continuous casting, and in particular to a free roll for dry continuous casting. Background Technology

[0002] In dry continuous casting, after the molten steel injected into the crystallizer is cooled into a relatively thin shell, it enters the casting flow guide section. At this time, because the thin high-temperature shell has a relatively low ability to resist mechanical stress and thermal stress, the service life requirements of the rollers in the casting flow guide section are very high.

[0003] The key difference between dry continuous casting and conventional continuous casting lies in their cooling mechanisms. Conventional continuous casting utilizes a long spray cooling zone for the billet, resulting in excellent cooling of the flow guide rollers and lower roller temperatures, easily meeting the casting machine's requirements for service life. In contrast, dry continuous casting employs a short spray cooling zone for the billet, leading to poor cooling of the flow guide rollers and higher roller temperatures. Furthermore, dry continuous casting rollers require heating to several hundred degrees Celsius during assembly. These two factors place higher demands on the sealing, temperature control, rigidity, and strength of dry continuous casting rollers. For example, conventional rubber seals are not well-suited to the high-temperature operating and assembly conditions of dry continuous casting rollers. Additionally, the bearing housing is a common failure point for rollers, and its rigidity, strength, and reliability require improvement. Finally, due to the short spray cooling zone, current cooling structures provide ineffective spray cooling water cooling. All these issues significantly reduce the service life of free rollers used in dry continuous casting.

[0004] Therefore, based on years of experience and practice in related industries, the inventor of this utility model proposes a free roll for dry continuous casting to overcome at least one of the defects of the prior art and improve the service life of free rolls used in dry continuous casting. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a free roll for dry continuous casting, which can effectively improve the service life.

[0006] The specific technical solution of this utility model embodiment is as follows:

[0007] A free roll for dry continuous casting, the free roll for dry continuous casting comprising: two segmented roll units, the two segmented roll units being arranged along the same axis;

[0008] Each of the segmented roller units includes:

[0009] The free roller body includes a mandrel portion, a roller sleeve portion is sleeved on the outside of the mandrel portion, and a cooling inner channel is provided through the mandrel portion; a cooling outer channel is provided on the outer wall of each mandrel portion;

[0010] The bearing support includes a bearing housing body sleeved on the outside of the spindle portion and spaced apart along the axial direction. At least one axial end of the bearing housing body is closed and a through cover is embedded at the other axial end of the bearing housing body. The bearing housing body and the through cover form an integral structure. At least one inner wall of one end of the bearing housing body and the inner wall of the through cover are both provided with an all-metal sealing unit for sealing the spindle portion. The bearing housing body is internally sealed with a bearing sleeved on the spindle portion.

[0011] The cooling section includes a cooling water pipe passing through the inner cooling channel, and a cooling annulus is formed between the cooling water pipe and the inner cooling channel. The cooling annulus can be segmented and sealed, and can communicate with the outer cooling channel. A dual-path rotary joint is provided at one end of the inner cooling channel. The dual-path rotary joint includes an inlet passage communicating with the cooling water pipe and a return passage communicating with the cooling annulus. The end of the cooling water pipe away from the dual-path rotary joint is connected to the cooling annulus.

[0012] A sealing assembly is disposed at one end of the spindle portion to seal the other end of the cooling inner channel.

[0013] Preferably, the mandrel portion includes end mandrels respectively disposed at both ends and a middle mandrel located between the end mandrels; the roller sleeve portion includes end roller sleeves, which are sleeved on the outside of the end mandrels and the adjacent middle mandrels; or, the roller sleeve portion includes end roller sleeves and middle roller sleeves, with the end roller sleeves sleeved on the outside of the end mandrels and the adjacent middle mandrels, and the middle roller sleeves sleeved on the outside of two adjacent middle mandrels;

[0014] A central bearing support is provided between the end roller sleeve and the middle roller sleeve, and between two adjacent middle roller sleeves. An end bearing support is provided at the end of the end roller sleeve away from the middle roller sleeve. The bearing support includes the end bearing support and the middle bearing support.

[0015] Preferably, the first end of the end mandrel extends outward from the end roller sleeve, and the end bearing support includes a first bushing and a third bushing sleeve sleeved on the outer wall of the first end of the end mandrel. The axial ends of the first bushing sleeve abut against the end faces of the bearing and the end roller sleeve, and one end of the third bushing sleeve abuts against the bearing. The third bushing sleeve is fixedly connected to the end of the end mandrel. The bearing seat body includes a first bearing seat body, and the all-metal sealing unit includes a first all-metal sealing unit. The outer side of the first bushing sleeve is sealed and fitted with the first bearing seat body, and the inner wall of the first bearing seat body is circumferentially fitted with the first all-metal sealing unit. The inner wall of the first all-metal sealing unit is sealed and fitted against the outer wall of the first bushing sleeve.

[0016] Preferably, the through cover includes a first through cover, the all-metal sealing unit includes a second all-metal sealing unit, the first bearing seat body is embedded and connected to the first through cover at one end away from the end roller sleeve, the inner wall of the first through cover is surrounded by the second all-metal sealing unit, and the inner wall of the second all-metal sealing unit is sealed and fitted to the outer wall of the third bushing.

[0017] Preferably, the first transparent cover has a through hole along the axial direction, the dual-path rotary joint passes through the through hole, and the end of the first transparent cover is connected to a limiting component to limit the dual-path rotary joint in the axial direction.

[0018] Preferably, the middle bearing support includes a second bushing sleeved on the outer wall of the middle mandrel, wherein the two axial ends of the second bushing abut against the adjacent end faces of the end roller sleeve and the adjacent middle roller sleeve, or the two axial ends of the second bushing abut against the adjacent end faces of two adjacent middle roller sleeves;

[0019] The bearing housing body includes a second bearing housing body, and the all-metal sealing unit includes a third all-metal sealing unit. The outer side of the second bushing is sealed with the second bearing housing body, and the inner wall of the second bearing housing body is circumferentially fitted with the third all-metal sealing unit. The inner wall of the third all-metal sealing unit is sealed and fitted to the outer wall of the second bushing.

[0020] The transparent cover includes a second transparent cover, and the all-metal sealing unit includes a fourth all-metal sealing unit. One end of the second bearing housing body is embedded and connected to the second transparent cover. The inner wall of the second transparent cover is surrounded by the fourth all-metal sealing unit, and the inner wall of the fourth all-metal sealing unit is sealed and fitted to the outer wall of the second bushing.

[0021] Preferably, one end of the cooling inner channel is provided with a first mounting hole with an increased diameter; the dual-path rotary joint is sealed and inserted into the first mounting hole, and the first mounting hole is connected to the return water passage; the water inlet passage is sealed and connected to one end of the cooling water pipe.

[0022] Preferably, at least one water seal is provided in the water return passage, and one water seal is provided between two adjacent bearing supports.

[0023] Preferably, radial cooling holes are provided on both sides of the water seal on the end mandrel and the middle mandrel, and the radial cooling holes are connected to the cooling outer channel on the outer wall of the mandrel portion.

[0024] Preferably, the all-metal sealing unit is made of stainless steel that can withstand temperatures above 500°C.

[0025] The technical solution of this utility model has the following significant beneficial effects:

[0026] 1. The through cover in this application is embedded at one end of the bearing housing body, forming an integral structure with the bearing housing body. This effectively increases the rigidity and strength of the bearing housing, extending its service life. The through cover is installed in the bearing housing body using an embedded method, ensuring that the area where the through cover mates with the bearing housing body is covered by the bearing housing body. This prevents external media from entering between the integrally formed bearing housing body and the through cover. During use, this effectively reduces the risk of impurities and high-temperature moisture entering between the through cover and the bearing housing body, thus avoiding corrosion of structures near the bearing and affecting the sealing and lubrication effects. This improves reliability and extends the bearing's service life.

[0027] 2. The sealing structure of the bearing support adopts an all-metal sealing unit, which can meet the requirements of high temperature resistance and corrosion resistance, ensuring a long service life of the sealing structure, and thus ensuring a long service life of the bearing support. Compared with existing rubber seals, the contact area with other mating parts is smaller, which reduces friction and greatly reduces heat generation and wear. This all-metal sealing unit is ideal for high-temperature and friction-sensitive parts.

[0028] 3. The free roll in this application consists of two segmented roll units arranged along the same axis. Each segmented roll unit can have a dual-path rotary joint at its end, and each dual-path rotary joint is connected to the cooling water pipe and cooling annulus within the segmented roll unit. Thus, for the free roll, two dual-path rotary joints handle the input and output of cooling water. The cooling water input through each dual-path rotary joint only needs to cool half the length of the free roll, thereby improving the cooling effect on the free roll surface and resulting in a lower and more uniform temperature for the free roll in dry continuous casting. Furthermore, the two segmented roll units increase the rigidity and strength of the free roll, providing better support for the cast billet and further extending the service life of the free roll in dry continuous casting.

[0029] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0030] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0031] Figure 1 This is a cross-sectional schematic diagram of a free roll used in dry continuous casting in an embodiment of this utility model;

[0032] Figure 2 for Figure 1 Enlarged view of section I in the middle;

[0033] Figure 3 for Figure 1 Enlarged view at point II;

[0034] Figure 4 for Figure 1 Enlarged view at point III;

[0035] Figure 5 This is a schematic diagram of the appearance of the free roll used in dry continuous casting in an embodiment of this utility model;

[0036] Figure 6 This is a schematic diagram of the middle bearing support in the installation state in an embodiment of this utility model;

[0037] Figure 7 This is an overall schematic diagram of the central bearing support portion in an embodiment of this utility model;

[0038] Figure 8 This is a side view of the central bearing support portion in an embodiment of the present invention;

[0039] Figure 9 for Figure 8 Sectional view at point AA.

[0040] The reference numerals in the above figures are as follows:

[0041] 10. Segmented roller unit; 1. Free roller body; 11. End mandrel; 12. Middle mandrel; 13. End roller sleeve; 2. Bearing support; 21. End bearing support; 211. First bushing; 212. First bearing housing body; 213. First all-metal sealing unit; 214. First cover; 215. Second all-metal sealing unit; 216. Third bushing; 217. Fourth bushing; 218. Fifth bushing; 22. Middle bearing support; 221. Second bushing; 222. Second bearing housing body; 2221. First shaft hole section; 22212. First groove; 2221 3. First seal; 2222. Second shaft hole section; 2223. Third shaft hole section; 2224. Fourth shaft hole section; 2225. First stepped portion; 2226. Second stepped portion; 223. Third all-metal sealing unit; 224. Second through cover; 2241. Second groove; 2242. Second seal; 225. Fourth all-metal sealing unit; 23. Bearing; 3. Cooling section; 30. Inner cooling channel; 301. First mounting hole; 31. Cooling water pipe; 32. Outer cooling channel; 33. Dual-way rotary joint; 34. Water seal; 35. Radial cooling hole; 4. Sealing assembly. Detailed Implementation

[0042] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are only for explaining the purpose of this utility model and should not be construed as limiting this utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] In order to effectively improve service life, this application proposes a free roll for dry continuous casting. Figure 1 This is a cross-sectional schematic diagram of the free roll used in dry continuous casting in an embodiment of this utility model. Figure 2 for Figure 1 Enlarged view at point I in the middle. Figure 3 for Figure 1 Enlarged view at point II in the middle. Figure 4 for Figure 1 Enlarged view at point III in the middle. Figure 5 This is a schematic diagram of the appearance of the free roll used in dry continuous casting in an embodiment of this utility model, as shown below. Figures 1 to 5 As shown, the free roll for dry continuous casting may include two segmented roll units 10, which are arranged along the same axis.

[0045] Each segmented roller unit 10 may include:

[0046] The free roller body 1 includes a spindle portion, a roller sleeve portion is sleeved on the outside of the spindle portion, and a cooling inner channel 30 is provided through the inside of the spindle portion; a cooling outer channel 32 is provided on the outer wall of each spindle portion.

[0047] The bearing support 2 includes a bearing 23 seat body sleeved on the outside of the spindle and spaced apart along the axial direction. At least one axial end of the bearing 23 seat body is closed and a through cover is embedded at the other axial end of the bearing 23 seat body. The bearing 23 seat body and the through cover form an integral structure. At least one inner wall of one end of the bearing 23 seat body and the inner wall of the through cover are both provided with an all-metal sealing unit for sealing the spindle. The bearing 23 sleeved on the spindle is sealed inside the bearing 23 seat body.

[0048] The cooling section 3 includes a cooling water pipe 31 that passes through the inner cooling channel 30. The cooling water pipe 31 and the inner cooling channel 30 form a cooling annulus. The cooling annulus can be segmented and can be connected to the outer cooling channel 32. A dual-path rotary joint 33 is provided at one end of the inner cooling channel 30. The dual-path rotary joint 33 includes an inlet passage that communicates with the cooling water pipe 31 and a return passage that communicates with the cooling annulus. The end of the cooling water pipe 31 away from the dual-path rotary joint 33 is connected to the cooling annulus.

[0049] A sealing assembly 4 is disposed at one end of the spindle portion to seal the other end of the cooling inner channel 30.

[0050] Furthermore, such as Figure 1 As shown, the mandrel portion includes end mandrels 11 respectively disposed at both ends and a middle mandrel 12 located between the end mandrels 11; the roller sleeve portion includes end roller sleeves 13, which are sleeved on the outside of the end mandrels 11 and the adjacent middle mandrels 12; or, the roller sleeve portion includes end roller sleeves 13 and middle roller sleeves, with the end roller sleeves 13 sleeved on the outside of the end mandrels 11 and the adjacent middle mandrels 12, and the middle roller sleeves sleeved on the outside of two adjacent middle mandrels 12.

[0051] A middle bearing support 22 is provided between the end roller sleeve 13 and the middle roller sleeve and / or between two adjacent middle roller sleeves. An end bearing support 21 is provided at the end of the end roller sleeve 13 away from the middle roller sleeve. The bearing support 2 includes the end bearing support 21 and the middle bearing support 22.

[0052] Furthermore, such as Figure 2 As shown, the first end of one end mandrel 11 protrudes from the end roller sleeve 13. The end bearing support 21 includes a first bushing 211 and a third bushing 216 sleeved on the outer wall of the first end of the end mandrel 11. The two axial ends of the first bushing 211 abut against the end faces of the bearing 23 and the end roller sleeve 13, and one end of the third bushing 216 abuts against the bearing 23. The third bushing 216 is fixedly connected to the end of the end mandrel 11. For example, the inner sidewall of the third bushing 216 may have an internal thread, and the outer sidewall of the end of the end of the end mandrel 11 may have an external thread. The third bushing 216 is fixedly connected to the end of the end mandrel 11 through a threaded connection. In this way, the third bushing 216 can abut against the bearing 23 and limit the bearing 23 in the axial direction.

[0053] The bearing 23 housing body includes a first bearing housing body 212, and the all-metal sealing unit includes a first all-metal sealing unit 213. The outer side of the first bushing 211 is sealed with the first bearing housing body 212, and the inner wall of the first bearing housing body 212 is surrounded by the first all-metal sealing unit 213. The inner wall of the first all-metal sealing unit 213 is sealed and fitted to the outer wall of the first bushing 211.

[0054] Furthermore, such as Figure 4 As shown, one end of the other end mandrel 11 protrudes from the end roller sleeve 13. The end bearing support 21 includes a fourth bushing 217 and a fifth bushing 218 fitted onto the outer wall of one end of the end mandrel 11. The axial ends of the fourth bushing 217 abut against the end faces of the bearing 23 and the end roller sleeve 13. The fifth bushing 218 is fixedly connected to the end of the end mandrel 11 and abuts against the bearing 23. For example, the fifth bushing 218 is fixedly connected to the end of the end mandrel 11 by bolts. In this way, the outermost part of the fifth bushing 218 in the radial direction can abut against the bearing 23, and limit the bearing 23 in the axial direction.

[0055] Furthermore, such as Figure 2 As shown, the through cover includes a first through cover 214, and the all-metal sealing unit includes a second all-metal sealing unit 215. The first bearing housing body 212 is embedded and connected to the first through cover 214 at one end away from the end roller sleeve 13. The inner wall of the first through cover 214 is surrounded by the second all-metal sealing unit 215, and the inner wall of the second all-metal sealing unit 215 is sealed and fitted to the outer wall of the third bushing 216.

[0056] The number of the first all-metal sealing unit 213 and the second all-metal sealing unit 215 is greater than or equal to 2. The combination of 2 first all-metal sealing units 213 or second all-metal sealing units 215 forms a multi-maze structure, which has a special sealing effect on grease lubrication and can also prevent dirt, dust and other forms of impurities from entering.

[0057] Furthermore, such as Figure 2 As shown, the first through cover 214 has a through hole along the axial direction, through which the dual-path rotary joint 33 passes. A limiting component is connected to the end of the first through cover 214 to limit the dual-path rotary joint 33 in the axial direction. The first through cover 214 has a radially extending portion and an annular axially extending portion. The through hole is located in the radially extending portion. The end of the first bearing housing body 212 away from the end roller sleeve 13 is fitted with the annular axially extending portion of the first through cover 214. The limiting component can be a cover plate, which is fixed by bolts extending along the axial direction, passing through the cover plate, and screwed into the annular axially extending portion of the first through cover 214. The cover plate abuts against the dual-path rotary joint 33, thereby limiting the dual-path rotary joint 33 in the axial direction. The cover plate can be integrally formed with the dual-path rotary joint 33.

[0058] Furthermore, such as Figure 3 As shown, the middle bearing support 22 includes a second bushing 221 sleeved on the outer wall of the middle spindle 12. The two axial ends of the second bushing 221 abut against the adjacent end faces of the end roller sleeve 13 and the adjacent middle roller sleeve, or the two axial ends of the second bushing 221 abut against the adjacent end faces of two adjacent middle roller sleeves.

[0059] like Figure 3 As shown, the bearing 23 housing body includes a second bearing housing body 222, and the all-metal sealing unit includes a third all-metal sealing unit 223. The outer side of the second bushing 221 is sealed with the second bearing housing body 222, and the inner wall of the second bearing housing body 222 is surrounded by the third all-metal sealing unit 223. The inner wall of the third all-metal sealing unit 223 is sealed and fitted to the outer wall of the second bushing 221.

[0060] like Figure 3As shown, the through cover includes a second through cover 224, and the all-metal sealing unit includes a fourth all-metal sealing unit 225. One end of the second bearing housing body 222 is embedded and connected to the second through cover 224. The inner wall of the second through cover 224 is surrounded by the fourth all-metal sealing unit 225, and the inner wall of the fourth all-metal sealing unit 225 seals against the outer wall of the second bushing 221.

[0061] The number of the third all-metal sealing unit 223 and the fourth all-metal sealing unit 225 is greater than or equal to 2. The combination of 2 third all-metal sealing units 223 or fourth all-metal sealing units 225 forms a multi-labyrinth structure, which has a special sealing effect on grease lubrication and can also prevent dirt, dust and other forms of impurities from entering.

[0062] Furthermore, such as Figure 2 As shown, one end of the cooling inner channel 30 is provided with a first mounting hole 301 with an increased diameter; the dual-path rotary joint 33 is sealed and inserted into the first mounting hole 301, and the first mounting hole 301 is connected to the return water passage; the water inlet passage is sealed and connected to one end of the cooling water pipe 31.

[0063] Furthermore, such as Figure 1 As shown, at least one water seal 34 is provided in the return water passage, and a water seal 34 is provided between two adjacent bearing support parts 2.

[0064] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, radial cooling holes 35 are respectively provided on both sides of the water seal 34 on the end mandrel 11 and the middle mandrel 12. The radial cooling holes 35 are connected to the cooling outer channel 32 on the outer wall of the mandrel part.

[0065] Furthermore, the all-metal sealing unit is made of stainless steel that can withstand temperatures above 500°C.

[0066] In other words, the all-metal sealing unit can be made of high-temperature and corrosion-resistant materials. For example, the all-metal sealing unit can be made of stainless steel with a temperature resistance of over 500℃, thus ensuring a long service life due to its strong corrosion resistance and stable performance under high-temperature conditions, which in turn ensures a long service life for the bearing support 2. Furthermore, compared to existing rubber seals, this all-metal sealing unit has a smaller contact area with other mating parts, reducing friction and significantly minimizing heat generation and wear. All-metal sealing units are ideal for high-temperature and friction-sensitive applications. In addition, the combination of two all-metal sealing units forms a multi-layered labyrinth structure, which provides a special sealing effect for grease lubrication and prevents the intrusion of dirt, dust, and other impurities.

[0067] Furthermore, such as Figure 4 As shown, the sealing assembly 4 may include a sealing cover, which is disposed at the end of the spindle portion and seals the other end of the cooling inner channel 30. The sealing cover extends at least partially into the cooling inner channel 30, and a sealing structure is provided between the sealing cover and the inner wall of the cooling inner channel 30. The sealing cover is fixedly connected to the end of the spindle portion by bolts. Furthermore, both the sealing cover and the sealing assembly 4 are disposed within the receiving space formed by the first transparent cover 214 and the end of the spindle portion.

[0068] Furthermore, such as Figures 5 to 9 As shown, the second bearing housing body 222 has a first side and a second side opposite to each other along the axial direction. From the first side to the second side, the second bearing housing body 222 is sequentially provided with a first shaft hole section 2221, a second shaft hole section 2222, a third shaft hole section 2223, and a fourth shaft hole section 2224 with increasing cross-sectional areas. A first groove 22212 is formed inwardly on the first inner wall where the first shaft hole section 2221 is located. The first groove 22212 is used to install the first seal 22213. The second shaft hole section 2222 and the third shaft hole section 2223 cooperate to form a first stepped portion 2225, which is used to abut against the bearing 23. The diameter of the third shaft hole section 2223 is adapted to the outer diameter of the bearing 23. The third shaft hole section 2223 and the fourth shaft hole section 2224 cooperate to form a second stepped portion 2226, which is used to abut against the cover of the bearing 23. The diameter of the fourth shaft hole section 2224 is adapted to the maximum outer diameter of the second cover 224.

[0069] like Figure 7 As shown, the second bearing housing body 222 is an integrally formed structure, specifically, it can be roughly a hollow rotating body. A mandrel portion passes through the second bearing housing body 222, and a bearing 23 is disposed between the mandrel portion and the second bearing housing body 222. A second bushing 221 is disposed at the left end of the bearing 23, located between the first side of the second bearing housing body 222 and the mandrel portion. A second cover 224 and the second bushing 221 are disposed at the right end of the bearing 23, located between the second side of the second bearing housing body 222 and the mandrel portion. In the embodiment of this application, one side of the second bearing housing body 222... Figure 1 As shown on the left, by integrally molding with the cover, the rigidity and strength of the second bearing 23 seat can be effectively increased, thereby improving its service life. In addition, when one side of the bearing 23 seat body is integrally molded with the cover, the assembly process can be simplified, and external media will not enter between the integrally molded second bearing seat body 222 and the cover, thereby improving the reliability during use.

[0070] The integral molding method adopted for the second bearing housing body 222 can include any of the following: casting molding and machining molding. Of course, the specific configuration of the integral molding method can also be other methods, and is not limited to the above description. Those skilled in the art may make other changes based on the technical essence of this application, but as long as the function and effect achieved are the same as or similar to this application, they should be covered within the protection scope of this application.

[0071] A first groove 22212 is formed inwardly on the first inner wall where the first shaft hole section 2221 is located. The first groove 22212 is used to install the first seal 22213. There can be two first grooves 22212, arranged at intervals along a first direction. Correspondingly, there can also be two first seals 22213 disposed in the first groove 22212. Specifically, the two first seals 22213 can be double-layered sealing rings arranged axially at intervals, used to increase the choking effect, and having continuous winding and balanced radial tension. The third all-metal sealing unit 223 may include the first groove 22212 and the first seal 22213.

[0072] The first seal 22213 is a metal seal. Specifically, the metal seal can be made of a high-temperature resistant and corrosion-resistant material. For example, it can be made of stainless steel with a temperature resistance of over 500 degrees Celsius, ensuring a long service life due to its strong corrosion resistance and performance under high-temperature conditions, thus guaranteeing a longer service life for the bearing 23 seat. Furthermore, compared to existing rubber seals, this metal seal has a smaller contact area with other mating parts, reducing friction and significantly decreasing heat generation and wear. This type of first seal 22213 is ideal for use in high-temperature, friction-sensitive applications. In addition, the combination of the two first seals 22213 forms a multi-layered labyrinth structure, providing a special sealing effect for grease lubrication and preventing the intrusion of dirt, dust, and other impurities.

[0073] In this embodiment, the diameter of the third shaft hole section 2223 is adapted to the outer diameter of the bearing 23 to accommodate the bearing 23. The second shaft hole section 2222 and the third shaft hole section 2223 cooperate to form a first stepped portion 2225, which is used to abut against the bearing 23.

[0074] The fourth shaft hole and the third shaft hole mate to assemble the second through cover 224. Specifically, the third shaft hole section 2223 and the fourth shaft hole section 2224 mate to form a second stepped portion 2226, which abuts against the second through cover 224. The diameter of the fourth shaft hole section 2224 is adapted to the maximum outer diameter of the second through cover 224. When the second through cover 224 is installed in the bearing 23 housing body, the position where the second through cover 224 mates with the bearing 23 housing body can be covered by the bearing 23 housing body. That is, the second through cover 224 is installed in the bearing 23 housing body by an embedded installation method. Compared with the prior art, where the second through cover 224 is directly covered on the end face of the bearing 23 housing body, this effectively reduces the risk of impurities and high-temperature moisture entering between the second through cover 224 and the bearing 23 housing body during use, thereby avoiding corrosion of the structure near the bearing 23 and affecting the sealing and lubrication performance.

[0075] The fourth shaft hole segment 2224 has a first length along the first direction, and the second through cover 224 has a main sidewall with the maximum outer diameter. The main sidewall has a second length along the axial direction, and the second length is equal to the first length. When the second through cover 224 is engaged with the bearing 23 seat body, the structure of the second through cover 224 and the bearing 23 seat body can be completely located within the bearing 23 seat body, thereby more reliably reducing the risk of impurities and high-temperature moisture entering between the second through cover 224 and the bearing 23 seat body.

[0076] The inner surface of the second cover 224 has a second groove 2241 along the axial direction, and a second seal 2242 is installed in the second groove 2241. The fourth all-metal sealing unit 225 may include the second groove 2241 and the second seal 2242.

[0077] The specific arrangement of the second groove 2241 and the second seal 2242 can refer to the arrangement of the first groove 22212 and the first seal 22213 described above. For example, there can be two second grooves 2241, which are arranged at intervals along the axial direction. Correspondingly, there can also be two second seals 2242 disposed in the second groove 2241. Specifically, the two second seals 2242 can be double-layered sealing rings arranged at intervals along the axial direction to increase the choking effect, and have continuous winding and balanced radial tension.

[0078] The second seal 2242 is a metal seal. Specifically, the material of this metal seal can be selected from materials that are resistant to high temperatures and corrosion. For example, the metal seal can be made of stainless steel that can withstand temperatures above 500 degrees Celsius, thus ensuring a long service life due to its strong corrosion resistance and performance under high-temperature conditions, thereby ensuring a long service life for the bearing 23 seat. In addition, compared with existing rubber seals, the contact area with other mating parts is smaller, and the contact area with related parts is also smaller and thicker, which reduces friction and thus greatly reduces heat generation and wear. This type of second seal 2242 is ideal for use in high-temperature and friction-sensitive parts. Furthermore, the combination of the two second seals 2242 forms a multi-layered labyrinth structure, which has a special sealing effect for grease lubrication and can also prevent dirt, dust and other forms of impurities from entering.

[0079] Alternatively, the first transparent cover 214 can also adopt a structure similar to that of the second transparent cover 224, which will not be described in detail here.

[0080] Cooling water can enter the cooling water pipe 31 from the water inlet passage of the double-path rotary joint 33 of the two segmented roller units 10. The end of the cooling water pipe 31 away from the double-path rotary joint 33 is connected to the cooling annulus, and then the cooling water enters the cooling annulus. The cooling water enters the cooling outer channel 32 through the radial cooling hole 35 upstream of the water seal 34 to cool the free roller body 1; this part of the cooling water moves forward through the next radial cooling hole 35 and then enters the cooling annulus. Under the blocking effect of the next water seal 34, the cooling water enters the cooling outer channel 32 through the next radial cooling hole 35, and so on. The cooling water returns and is discharged through the return water passage from the cooling annulus, the first mounting hole 301, and the double-path rotary joint 33.

[0081] Furthermore, as the cooling water flows through the cooling annulus, a bearing support 2 is provided in the corresponding area of ​​the cooling annulus. At least a portion of the radial cooling holes 35 on the central spindle 12 are located on both sides of the bearing support 2.

[0082] In existing technologies, the through cover is directly placed on the end face of the bearing 23 housing body, which cannot form a good seal and poses a risk of impurities and moisture entering. In this application, however, the through cover is embedded in one end of the bearing 23 housing body, forming an integral structure. This effectively increases the rigidity and strength of the bearing 23 housing, extending its service life. The through cover is installed in the bearing 23 housing body using an embedded method, ensuring that the area where the through cover mates with the bearing 23 housing body is covered by the bearing 23 housing body. External media cannot enter between the integrally formed bearing 23 housing body and the through cover. During use, this effectively reduces the risk of impurities and high-temperature moisture entering between the through cover and the bearing 23 housing body, thereby preventing corrosion of structures near the bearing 23 and affecting the sealing and lubrication effects, thus improving reliability and extending its service life.

[0083] The sealing structure of the bearing support 2 adopts an all-metal sealing unit, which can meet the requirements of high temperature resistance and corrosion resistance, ensuring a long service life of the sealing structure, and thus ensuring a long service life of the bearing support 2. Compared with existing rubber seals, the contact area with other mating parts is smaller, which can reduce friction and greatly reduce heat generation and wear. This all-metal sealing unit is ideal for high-temperature and friction-sensitive parts.

[0084] The free roll in this application consists of two segmented roll units 10, which are arranged along the same axis. Each segmented roll unit 10 has a dual-path rotary joint 33 at its end, and each dual-path rotary joint 33 is connected to the cooling water pipe 31 and cooling annulus in the segmented roll unit 10. Thus, for the free roll, two dual-path rotary joints 33 handle the input and output of cooling water. The cooling water input through each dual-path rotary joint 33 only needs to cool half the length of the free roll, thereby improving the cooling effect on the free roll surface and resulting in a lower and more uniform temperature for the free roll in dry continuous casting. Furthermore, the two segmented roll units 10 increase the rigidity and strength of the free roll, providing better support for the cast billet and further extending the service life of the free roll in dry continuous casting.

[0085] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0086] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A free roll for dry continuous casting, characterized in that, The free roll for dry continuous casting includes: two segmented roll units, the two segmented roll units being arranged along the same axis; Each of the segmented roller units includes: The free roller body includes a mandrel portion, a roller sleeve portion is sleeved on the outside of the mandrel portion, and a cooling inner channel is provided through the mandrel portion; a cooling outer channel is provided on the outer wall of each mandrel portion; The bearing support includes a bearing housing body sleeved on the outside of the spindle portion and spaced apart along the axial direction. At least one axial end of the bearing housing body is closed and a through cover is embedded at the other axial end of the bearing housing body. The bearing housing body and the through cover form an integral structure. At least one inner wall of one end of the bearing housing body and the inner wall of the through cover are both provided with an all-metal sealing unit for sealing the spindle portion. The bearing housing body is internally sealed with a bearing sleeved on the spindle portion. The cooling section includes a cooling water pipe passing through the inner cooling channel, and a cooling annulus is formed between the cooling water pipe and the inner cooling channel. The cooling annulus can be segmented and sealed, and can communicate with the outer cooling channel. A dual-path rotary joint is provided at one end of the inner cooling channel. The dual-path rotary joint includes an inlet passage communicating with the cooling water pipe and a return passage communicating with the cooling annulus. The end of the cooling water pipe away from the dual-path rotary joint is connected to the cooling annulus. A sealing assembly is disposed at one end of the spindle portion to seal the other end of the cooling inner channel.

2. The free roll for dry continuous casting according to claim 1, characterized in that, The mandrel portion includes end mandrels respectively disposed at both ends and a middle mandrel located between the end mandrels; the roller sleeve portion includes end roller sleeves, which are sleeved on the outside of the end mandrels and the adjacent middle mandrels; or, the roller sleeve portion includes end roller sleeves and middle roller sleeves, with the end roller sleeves sleeved on the outside of the end mandrels and the adjacent middle mandrels, and the middle roller sleeves sleeved on the outside of two adjacent middle mandrels; A central bearing support is provided between the end roller sleeve and the middle roller sleeve, and between two adjacent middle roller sleeves. An end bearing support is provided at the end of the end roller sleeve away from the middle roller sleeve. The bearing support includes the end bearing support and the middle bearing support.

3. The free roll for dry continuous casting according to claim 2, characterized in that, One end of the end mandrel protrudes from the end roller sleeve. The end bearing support includes a first bushing and a third bushing fitted on the outer wall of the first end of the end mandrel. The axial ends of the first bushing abut against the end faces of the bearing and the end roller sleeve. One end of the third bushing abuts against the bearing. The third bushing is fixedly connected to the end of the end mandrel. The bearing housing body includes a first bearing housing body. The all-metal sealing unit includes a first all-metal sealing unit. The outer side of the first bushing is sealed and fitted with the first bearing housing body. The inner wall of the first bearing housing body is circumferentially fitted with the first all-metal sealing unit. The inner wall of the first all-metal sealing unit is sealed and fitted against the outer wall of the first bushing.

4. The free roll for dry continuous casting according to claim 3, characterized in that, The transparent cover includes a first transparent cover, and the all-metal sealing unit includes a second all-metal sealing unit. The first bearing housing body is embedded and connected to the first transparent cover at one end away from the end roller sleeve. The second all-metal sealing unit is arranged around the inner wall of the first transparent cover, and the inner wall of the second all-metal sealing unit is sealed and fitted to the outer wall of the third bushing.

5. The free roll for dry continuous casting according to claim 4, characterized in that, The first transparent cover has a through hole along the axial direction, the dual-path rotary joint passes through the through hole, and the end of the first transparent cover is connected to a limiting component to limit the dual-path rotary joint in the axial direction.

6. The free roll for dry continuous casting according to claim 2, characterized in that, The central bearing support includes a second bushing sleeved on the outer wall of the central spindle. The two axial ends of the second bushing abut against the adjacent end faces of the end roller sleeve and the adjacent central roller sleeve, or the two axial ends of the second bushing abut against the adjacent end faces of two adjacent central roller sleeves. The bearing housing body includes a second bearing housing body, and the all-metal sealing unit includes a third all-metal sealing unit. The outer side of the second bushing is sealed with the second bearing housing body, and the inner wall of the second bearing housing body is circumferentially fitted with the third all-metal sealing unit. The inner wall of the third all-metal sealing unit is sealed and fitted to the outer wall of the second bushing. The transparent cover includes a second transparent cover, and the all-metal sealing unit includes a fourth all-metal sealing unit. One end of the second bearing housing body is embedded and connected to the second transparent cover. The inner wall of the second transparent cover is surrounded by the fourth all-metal sealing unit, and the inner wall of the fourth all-metal sealing unit is sealed and fitted to the outer wall of the second bushing.

7. The free roll for dry continuous casting according to claim 2, characterized in that, One end of the cooling inner channel is provided with a first mounting hole with an increased diameter; the dual-path rotary joint is sealed and inserted into the first mounting hole, and the first mounting hole is connected to the return water passage; the water inlet passage is sealed and connected to one end of the cooling water pipe.

8. The free roll for dry continuous casting according to claim 7, characterized in that, At least one water seal is provided in the water return passage, and one water seal is provided between two adjacent bearing supports.

9. The free roll for dry continuous casting according to claim 8, characterized in that, Radial cooling holes are respectively provided on both sides of the water seal on the end mandrel and the middle mandrel, and the radial cooling holes are connected to the cooling outer channel on the outer wall of the mandrel portion.

10. The free roll for dry continuous casting according to claim 1, characterized in that, The all-metal sealing unit is made of stainless steel that can withstand temperatures above 500°C.

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