A large telescopic inner circulation transmission coupling shaft, transmission device and continuous rolling mill train

Abstract

The application discloses a large telescopic inner circulation transmission coupling shaft, a transmission device and a continuous rolling mill set, and belongs to the technical field of rolling mill transmission shafts. The intermediate shaft assembly of the coupling shaft comprises a swing angle part, the swing angle part comprises a sleeve, a circular arc sliding block, a first gland and a second gland; the intermediate shaft body is provided with the sleeve on the outside, the sleeve is fixed on the circular arc sliding block through a shaft check ring on the left side and is fixed on a circular ring through a bolt on the right side, the sleeve is provided with a through hole and is matched with an oil baffle; the circular arc sliding block is fixed in a roller end outer tooth shaft sleeve threaded hole through a long stud through the first gland and the second gland, and the circular arc sliding block, the first gland and the second gland can slide relative to each other. The circular arc sliding block can realize the swing angle function; the first gland and the second gland for fixing the circular arc sliding block are in a split structure, and the sealing can be replaced on line by disassembling the bolt.

Description

Technical Field

[0001] This invention belongs to the technical field of rolling mill drive shafts, and more specifically, relates to a large telescopic internal circulation drive shaft, a drive device, and a continuous rolling mill unit. Background Technology

[0002] With the development of advanced technologies in modern metallurgical production, there is a need for highly automated, efficient, and precise rolling equipment, which poses new challenges to the related spare parts industry. For finishing rolling mills, continuous casting and rolling mills, and cold rolling mills, the main drive shaft is a key transmission component of the entire rolling mill. Its performance, function, quality, and stability are directly related to the output and quality of strip products, and directly affect its service life.

[0003] As is generally known, drum-shaped gear shafts are widely used as mechanical transmission components in hot continuous rolling mills. They are broadly classified into two categories based on their structure: thin oil lubricated drum-shaped gear shafts and dry oil lubricated drum-shaped gear shafts. Among them, thin oil lubricated drum-shaped gear shafts are more widely used due to their better lubrication conditions and longer service life.

[0004] For example, Chinese patent CN219664740U discloses an internal circulation drum-shaped gear transmission shaft including a first transmission shaft, a second transmission shaft, and a lubricating oil internal circulation system. The first transmission shaft is provided with a first slip ring, a first drum-shaped tooth, and a first end cap, with a first gap between the first drum-shaped tooth and the first end cap. The second transmission shaft is provided with a second slip ring, a second drum-shaped tooth, and a second end cap, with a second gap between the second drum-shaped tooth and the second end cap. The lubricating oil internal circulation system includes a lubricating oil tank, a lubricating oil output pipe, a lubricating oil recovery tank, and a lubricating oil return pipe. The lubricating oil internal circulation system delivers lubricating oil to the first transmission shaft and the second transmission shaft respectively through the first slip ring and the second slip ring. After the lubricating oil circulates through the internal circulation of the first transmission shaft and the second transmission shaft respectively, it lubricates the first drum-shaped tooth and the second drum-shaped tooth respectively. Finally, the lubricating oil flows into the lubricating oil recovery tank through the first gap and the second gap, realizing the circulation of lubricating oil.

[0005] For example, Chinese patent CN111570522A discloses an internal circulation heavy-duty drum-shaped toothed coupling shaft, including: a roller end assembly, a toothed end assembly, and a drive shaft; the drive shaft is a split type; a hydraulic mechanism is provided between the drive shaft and the toothed end assembly, which can push and pull the drive shaft to move left and right; the drive shaft includes a roller end shaft head of the drum-shaped toothed coupling connecting the roller end assembly; a toothed end shaft head of the drum-shaped toothed coupling connecting the toothed end assembly; a connecting pipe connecting the roller end shaft head and the toothed end shaft head; the hydraulic mechanism is a hydraulic cylinder connected to the left end of the toothed end shaft head, and the push-pull rod of the hydraulic cylinder is threadedly connected to the right end of the inner cavity of the toothed end assembly.

[0006] For example, Chinese patent CN204035193U discloses an internally circulating thin oil lubricated drum-shaped gear shaft that enhances oil return effect, improves lubrication conditions, and simplifies the oil circuit structure within the shaft. The shaft includes a roll connection end, a transmission connection end, a sealing device, an intermediate shaft, a spring device, an oil supply ring, a first plug, and a second plug. The roll connection end has a first oil cavity and a third oil cavity; the transmission connection end has a second oil cavity and a fourth oil cavity; the first oil cavity and the third oil cavity are connected; the second oil cavity and the fourth oil cavity are connected; the intermediate shaft has a central through hole; the central through hole connects the first oil cavity and the second oil cavity; an oil return channel offset from the central axis of the intermediate shaft is provided inside the intermediate shaft; the oil return channel connects the third oil cavity and the second oil cavity.

[0007] However, the aforementioned disclosed internal circulation telescopic main drive shafts all employ drum-shaped tooth telescopic mechanisms, which limit their telescopic range and cannot achieve large telescopic functionality. Furthermore, in some scenarios, vibrations cause small-angle deviations between the transmission end and the roll end, making the current rigid connection of the shaft position highly susceptible to wear. Therefore, it is necessary to develop a large telescopic internal circulation drive shaft to overcome these shortcomings. Summary of the Invention

[0008] 1. The problem to be solved

[0009] To address the technical problem of existing technologies being unable to achieve large extension and retraction, this invention provides a large extension and retraction internal circulation transmission shaft that can achieve a swing angle function, allowing the transmission end and the roll end to be adjusted at a small angle, thereby reducing wear.

[0010] In addition, the present invention can also realize the large expansion and contraction function of internal circulation, and at the same time, it uses thin oil lubrication, which has a good sealing effect.

[0011] Another object of the present invention is to provide a transmission device having the above-mentioned large telescopic internal circulation transmission coupling shaft.

[0012] Another object of the present invention is to provide a continuous rolling mill having the above-described transmission device.

[0013] 2. Technical Solution

[0014] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0015] The first aspect of the present invention provides a large telescopic internal circulation transmission shaft, including a roller end assembly, an intermediate shaft assembly, and a toothed end assembly; the roller end assembly, the intermediate shaft assembly, the toothed end assembly, a first oil passage, a second oil passage, and an oil collection tank;

[0016] The roller end assembly includes an external toothed bushing at the roller end, a roller end bushing, and a first connecting disc.

[0017] The toothed end assembly includes an inner toothed ring, an outer toothed bushing, a second connecting disc, and a third pressure cap.

[0018] The intermediate shaft assembly includes a swing angle component, which includes a sleeve, an arc-shaped slider, a first pressure cap, and a second pressure cap. The sleeve is provided on the outer side of the intermediate shaft body. The left side of the sleeve is fixed to the arc-shaped slider by a shaft retaining ring, and the right side is fixed to a ring and bolted together. The sleeve has a through hole and is fitted with an oil retaining ring. The arc-shaped slider is fixed in the threaded hole of the external gear sleeve at the roller end by long studs through the first and second pressure caps. The arc-shaped slider, the first pressure cap, and the second pressure cap can slide relative to each other.

[0019] According to any embodiment of the first aspect of the present invention, the intermediate shaft assembly further includes an intermediate shaft body, a second drum-shaped gear sleeve and a first drum-shaped gear sleeve, a sealing assembly, an oil inlet ring, a first positioning ring and a second positioning ring;

[0020] An external spline is provided on the outer surface of the right end of the intermediate shaft body, and an internal spline is provided on the inner surface of the left end of the second drum-shaped gear sleeve. Large expansion and contraction are achieved by the cooperation of the external spline and the internal spline. The right end face of the intermediate shaft body is fixedly connected to the first positioning ring by bolts, and the left end face of the second drum-shaped gear sleeve is connected to the second positioning ring by interference fit.

[0021] The sealing assembly includes a first double seal between the arc slider and the first pressure plate, a second double seal between the arc slider and the second pressure plate and a second V-shaped seal, a first V-shaped seal between the first pressure plate and the stop of the outer toothed bushing at the roller end, a first round rubber between the first pressure plate and the second pressure plate, and a second round rubber between the arc slider and the sleeve.

[0022] The oil inlet ring is installed on the intermediate shaft body. The oil inlet ring connects the first oil passage and the second oil passage. The first oil passage lubricates the drum teeth of the first drum-shaped gear sleeve and returns to the oil collection tank through the gap between the intermediate shaft body and the sleeve.

[0023] The second oil circuit lubricates the spline pair and the drum-shaped teeth of the second drum-shaped gear bushing, which then return to the oil collection tank.

[0024] The aforementioned first oil circuit design provides an effective lubrication mechanism for the arc slider of the swing angle component, ensuring that the arc slider is immersed in thin oil as much as possible. A lubricating oil film layer is always formed between the top surface of the arc slider and the inner arc surfaces of the first and second pressure caps, ensuring smooth swing at small angles. At the same time, the use of a first double seal, a second double seal, a second V-shaped seal, a first round rubber, and a second round rubber to form a sealing structure effectively solves the problem of thin oil leakage.

[0025] During use, the inventor was surprised to discover that...

[0026] According to any embodiment of the first aspect of the present invention, a protective cover is provided at the left end of the second drum-shaped gear sleeve, the protective cover is fixedly connected by a third connecting plate, a chuck, and bolts, a V-shaped sealing ring is provided between the left end of the protective cover and the intermediate shaft body, the first drum-shaped gear sleeve is fixed to the spring rod by a retaining ring and a retaining ring through a hole, the left end of the spring rod abuts against the spring, and the right end is fixed to the second connecting plate and the top block.

[0027] According to any embodiment of the first aspect of the present invention, the spring rod is provided with a plurality of oil inlet holes, and the oil inlet holes are connected to and communicate with a second oil passage.

[0028] According to any embodiment of the first aspect of the present invention, an oil groove is provided on the outer side of the sleeve for throwing thin oil into the oil collection tank.

[0029] According to any embodiment of the first aspect of the present invention, a gap is provided between the first positioning ring and the inner hole of the second drum-shaped toothed bushing.

[0030] According to any embodiment of the first aspect of the present invention, an oil injector is provided on each of the top blocks on both sides of the intermediate shaft body.

[0031] A second aspect of the present invention provides a transmission device, including the large telescopic internal circulation transmission shaft described in the first aspect above.

[0032] A third aspect of the present invention provides a continuous rolling mill having the second aspect described above, wherein the continuous rolling mill includes, but is not limited to, a finishing continuous rolling mill, a continuous casting continuous rolling mill, and a cold continuous rolling mill.

[0033] 3. Beneficial effects

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] (1) The large telescopic internal circulation transmission shaft of the present invention, wherein the arc slider can realize the swing angle function; the first pressure cover and the second pressure cover that fix the arc slider are separate structures, and the seal can be replaced online by disassembling the bolts;

[0036] (2) The large telescopic internal circulation transmission shaft of the present invention adopts an internal circulation and large telescopic structure, and the spline telescopic replaces the drum-shaped tooth telescopic, which can realize the internal circulation large telescopic function; the sealing component adopts a combination of arc surface sealing and end face sealing to increase the reliability of sealing; the multiple sealing structure increases the reliability of sealing.

[0037] (3) The large telescopic internal circulation transmission shaft of the present invention enters oil from the oil inlet ring and splits into two paths from the middle. The left path lubricates the drum-shaped teeth at the end of the roller and returns to the oil collection tank through the gap between the intermediate shaft body and the sleeve. The right path lubricates the spline and the drum-shaped teeth and returns to the oil tank. Moreover, this spline pair is immersed in thin oil, which greatly improves the lubrication effect of the spline pair.

[0038] (4) The large telescopic internal circulation transmission shaft of the present invention has a split protective cover designed at the spline pair. The thin oil can lubricate the spline without flowing into the oil collection tank from here, and return from the drum-shaped teeth to the oil collection tank, thereby fully lubricating the drum-shaped teeth at the tooth ends. The wear condition of the spline pair can also be checked online by disassembling the protective cover.

[0039] (5) The large telescopic internal circulation transmission shaft of the present invention has a double positioning design on the right spline tail of the intermediate shaft body and the left end of the first drum-shaped toothed bushing, which plays a positioning role when the spline is telescopic and makes the shaft more stable during operation.

[0040] (6) The large telescopic internal circulation transmission shaft of the present invention, the roller end external gear bushing and the retaining ring adopt an integral structure to avoid the loosening of bolts during online maintenance;

[0041] (7) The large telescopic internal circulation transmission shaft of the present invention has a split structure for the oil collection tank, which consists of three parts. The lower part has an integral structure with a sloping bottom surface, which facilitates the smooth entry of thin oil from the oil outlet into the hydraulic station, thereby achieving circulation. The upper part has a split structure, which facilitates installation and disassembly.

[0042] (8) The large telescopic internal circulation transmission shaft of the present invention has a right tooth end external tooth bushing fixed to the spring shaft assembly rod by a retaining ring through a hole, while the left end of the spring rod is pressed by the spring force, and the right end is fixed by the second connecting plate and the top block. The left tooth end external tooth bushing is fixed to the intermediate shaft body by a shaft retaining ring and a retaining ring.

[0043] (9) The large telescopic internal circulation transmission shaft of the present invention has an oil injector on each of the two oil passages inside the middle shaft body to control the lubrication flow on both sides. Attached Figure Description

[0044] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless specifically indicated, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0045] Figure 1 A schematic diagram of the existing large telescopic internal circulation transmission shaft structure;

[0046] Figure 2 This is a schematic diagram of the large telescopic internal circulation transmission shaft structure of the present invention;

[0047] Figure 3 This is a sectional view along line AA;

[0048] Figure 4 for Figure 2 A schematic diagram of the enlarged structure of part B;

[0049] Figure 5 This is a schematic diagram of the oil circuit structure of the large telescopic internal circulation transmission shaft of the present invention;

[0050] Figure 6 for Figure 5 A magnified structural diagram of section C;

[0051] Figure 7 for Figure 5 A schematic diagram of the enlarged structure of part D;

[0052] Figure 8 for Figure 5 A magnified structural diagram of part E;

[0053] Explanation of reference numerals in the attached figures:

[0054] 10. Roller end assembly; 11. Roller end external gear bushing; 12. Roller end bushing; 13. First connecting disc;

[0055] 20. Tooth end assembly; 21. Tooth end internal gear ring; 22. Tooth end external gear bushing; 23. Second connecting disc; 24. Third pressure cap;

[0056] 30. Intermediate shaft assembly; 31. Intermediate shaft body; 311. External spline; 32. Second drum-shaped gear sleeve; 321. Internal spline; 322. Protective cover; 323. Third connecting plate; 324. Chuck; 325. V-ring seal; 326. Hole retaining ring; 327. Top block; 328. Retaining ring; 329. Oil injector; 33. First drum-shaped gear sleeve; 34. Sway angle component; 341. Sleeve; 342. Arc slider; 343. First pressure cap 344. Second gland; 345. Shaft retaining ring; 346. Oil retaining ring; 347. Circular ring; 35. Oil inlet ring; 361. First positioning ring; 362. Second positioning ring; 37. Spring rod; 371. Oil inlet hole; 38. Spring; 39. Sealing assembly; 391. First double seal; 392. Second double seal; 393. Second V-type seal; 394. First V-type seal; 395. First circular rubber; 396. Second circular rubber;

[0057] 40. First oil circuit; 50. Second oil circuit; 60. Oil collection tank. Detailed Implementation

[0058] The following detailed description of exemplary embodiments of the invention is taken with reference to the accompanying drawings, which form part of the description and illustrate exemplary embodiments in which the invention may be practiced. While these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be implemented and various changes may be made to the invention without departing from the spirit and scope thereof. The more detailed description of embodiments of the invention below is not intended to limit the scope of the claimed invention, but is merely illustrative and not restrictive of the description of the features and characteristics of the invention, to suggest the best mode for carrying out the invention, and is sufficient to enable those skilled in the art to practice the invention. Therefore, the scope of the invention is defined only by the appended claims.

[0059] The following detailed description and exemplary embodiments of the invention can be better understood in conjunction with the accompanying drawings, wherein the elements and features of the invention are identified by reference numerals.

[0060] like Figures 1 to 8 As shown, the large telescopic internal circulation transmission shaft of this embodiment includes a roll end assembly 10, an intermediate shaft assembly 30, a toothed end assembly 20, a first oil passage 40, a second oil passage 50, and an oil collection tank 60. The roll end assembly 10 and the toothed end assembly 20 are used to connect external equipment. That is, the two ends of the intermediate shaft assembly 30 are respectively connected to the roll end assembly 10 and the toothed end assembly 20. The end of the roll end assembly 10 is the roll end, and the end of the toothed end assembly 20 is the transmission end. The aforementioned external equipment includes, but is not limited to, rolling mills. The large telescopic internal circulation transmission shaft of this embodiment can be used as a transmission device for continuous rolling mills, mainly involving major metallurgical equipment such as hot continuous rolling mills and cold continuous rolling mills.

[0061] Among them, such as Figure 1 and Figure 5 As shown, the roll end assembly 10 includes a roll end external toothed bushing 11, a roll end bushing 12, and a first connecting disc 13; the roll end external toothed bushing 11 has an inner cavity, the roll end bushing 12 is installed on the roll end of the intermediate shaft assembly 30, the roll end bushing 12 is adapted to the inner cavity of the roll end external toothed bushing 11, the first connecting disc 13 is installed in the inner cavity of the roll end external toothed bushing 11 and is sealed to the inner cavity of the roll end external toothed bushing 11, and there is an oil cavity A between the first connecting disc 13 and the end face of the roll end of the intermediate shaft assembly 30, and the oil cavity A is connected to the first oil passage 40.

[0062] Furthermore, the toothed end assembly 20 includes an inner toothed ring 21, an outer toothed bushing 22, a second connecting disc 23, and a third pressure cap 24; the inner toothed ring 21 has an inner cavity; the transmission end of the intermediate shaft assembly 30 is equipped with a second drum-shaped toothed bushing 32; the second drum-shaped toothed bushing 32 is adapted to the inner cavity of the inner toothed ring 21, the second connecting disc 23 is installed in the inner cavity of the inner toothed ring 21 and is sealed to the inner cavity of the inner toothed ring 21, and there is an oil cavity B between the second connecting disc 23 and the end face of the transmission end of the intermediate shaft assembly 30, the oil cavity B is connected to the second oil passage 50; the inner toothed ring 21 is provided with a third pressure cap 24.

[0063] In this embodiment, as Figure 6 As shown, the intermediate shaft assembly 30 includes a swing angle component 34, which includes a sleeve 341, an arc-shaped slider 342, a first pressure cap 343, and a second pressure cap 344. The sleeve 341 is provided on the outer side of the intermediate shaft body 31. The left side of the sleeve 341 is fixed to the arc-shaped slider 342 by a shaft retaining ring 345, and the right side is fixed to a ring 347 and bolted together. The sleeve 341 has a through hole and is fitted with an oil retaining ring 346. The arc-shaped slider 342 is fixed in the threaded hole of the roller end external gear sleeve 11 by a long stud through the first pressure cap 343 and the second pressure cap 344. The arc-shaped slider 342, the first pressure cap 343, and the second pressure cap 344 can slide relative to each other.

[0064] To better collect the thin oil, an oil trough is provided on the outside of the sleeve 341 to throw the thin oil into the oil collection tank 60.

[0065] The arc slider 342 of the present invention has an arc surface that is in surface contact with the first pressure cover 343 and the second pressure cover 344, and can realize the swing angle function; the first pressure cover 343 and the second pressure cover 344 that fix the arc slider 342 are separate structures, and the seal can be replaced online by disassembling the bolts.

[0066] In this embodiment, the intermediate shaft assembly 30 further includes an intermediate shaft body 31, a second drum-shaped gear sleeve 32 and a first drum-shaped gear sleeve 33, a sealing assembly 39, an oil inlet ring 35, a first positioning ring 361 and a second positioning ring 362.

[0067] Furthermore, in combination Figure 8As shown, the outer surface of the right end of the intermediate shaft body 31 is provided with an external spline 311, and the inner surface of the left end of the second drum-shaped toothed bushing 32 is provided with an internal spline 321. The large extension and retraction are achieved by the cooperation of the external spline 311 and the internal spline 321. The right end face of the intermediate shaft body 31 is fixedly connected to the first positioning ring 361 by bolts. Preferably, there is a gap between the first positioning ring 361 and the inner hole of the second drum-shaped toothed bushing 32 to ensure that the first positioning ring 361 and the second drum-shaped toothed bushing 32 do not interfere with each other during extension and retraction. The left end face of the second drum-shaped toothed bushing 32 is press-fitted with the second positioning ring 362. This achieves dual positioning at the spline tail on the right side of the intermediate shaft body 31 and the left end of the first drum-shaped toothed bushing 33, which plays a positioning role during spline extension and retraction and makes the shaft connection more stable during operation.

[0068] Regarding this invention, it should be emphasized that, as Figure 4 As shown, the sealing assembly 39 includes a first double seal 391 between the arc slider 342 and the first pressure cover 343, a second double seal 392 and a second V-shaped seal 393 between the arc slider 342 and the second pressure cover 344, a first V-shaped seal 394 between the first pressure cover 343 and the stop of the roller end external toothed bushing 11, a first round rubber 395 between the first pressure cover 343 and the second pressure cover 344, and a second round rubber 396 between the arc slider 342 and the sleeve 341.

[0069] Combination Figure 7 As shown, the oil inlet ring 35 is disposed on the intermediate shaft body 31. The oil inlet ring 35 connects the first oil passage 40 and the second oil passage 50. The first oil passage 40 lubricates the drum teeth of the first drum-shaped gear sleeve 33 and returns to the oil collection tank 60 through the gap between the intermediate shaft body 31 and the sleeve 341. The second oil passage 50 lubricates the spline pair and the drum teeth of the second drum-shaped gear sleeve 32 and returns to the oil collection tank 60.

[0070] The design of the first oil passage 40 described above can provide an effective lubrication mechanism for the arc slider 342 of the swing angle component 34, so that the arc slider 342 is immersed in thin oil as much as possible. A lubricating oil film layer is always formed between the top surface of the arc slider 342 and the inner arc surfaces of the first pressure cap 343 and the second pressure cap 344, ensuring the smoothness of small-angle swing. At the same time, the sealing structure is formed by the first double seal 391, the second double seal 392, the second V-type seal 393, the first round rubber 395, and the second round rubber 396, which effectively solves the problem of thin oil leakage.

[0071] exist Figure 3 In the middle, the oil collection tank 60 adopts a split structure, consisting of three parts. The lower part adopts an integral structure with a sloped bottom surface, which facilitates the smooth entry of thin oil from the oil outlet into the hydraulic station, thereby realizing circulation. The upper part adopts a split structure, which is convenient for installation and disassembly.

[0072] Combination Figure 7 As shown, a protective cover 322 is provided at the left end of the second drum-shaped gear sleeve 32. The protective cover 322 is fixedly connected by a third connecting plate 323, a chuck 324, and bolts. A V-shaped sealing ring 325 is provided between the left end of the protective cover 322 and the intermediate shaft body 31. The first drum-shaped gear sleeve 33 is fixed to the spring rod 37 by a retaining ring 326 and a retaining ring 328. The left end of the spring rod 37 abuts against the spring 38, and the right end is fixed to the second connecting plate 23 and the top block 327. Preferably, multiple oil inlets 371 are provided on the spring rod 37, and the oil inlets 371 are connected to the second oil passage 50.

[0073] Combination Figure 8 As shown, each of the top blocks 327 on both sides of the intermediate shaft body 31 is provided with an oil nozzle 329. The oil nozzles 329 can control the lubrication flow of the oil passages on both sides inside the intermediate shaft body 31, ensuring smooth lubrication.

[0074] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A large telescopic internal circulation transmission shaft, comprising a roller end assembly (10), an intermediate shaft assembly (30), a toothed end assembly (20), a first oil passage (40), a second oil passage (50), and an oil collection tank (60); characterized in that, The intermediate shaft assembly (30) includes a swing angle component (34) and a sealing assembly (39). The swing angle component (34) includes a sleeve (341), an arc slider (342), a first pressure cap (343), and a second pressure cap (344). The intermediate shaft assembly (30) also includes an intermediate shaft body (31), a second drum-shaped gear sleeve (32) and a first drum-shaped gear sleeve (33), an oil inlet ring (35), a first positioning ring (361) and a second positioning ring (362); a sleeve (341) is provided on the outside of the intermediate shaft body (31), the arc slider (342) is sleeved on the left side of the sleeve (341) and fixed by a shaft retaining ring (345), and the right side is fixed on a circular ring (347) and bolted together. The sleeve (341) is provided with a through hole and is fitted with an oil retaining ring (346). The first pressure cap (343) and the second pressure cap (344) are fixed in the threaded hole of the roller end external toothed bushing (11) with long studs, and the arc slider (342) and the first pressure cap (343) and the second pressure cap (344) can slide relative to each other; The sealing assembly (39) includes a first double seal (391) between the first pressure cap (343) and the arc slider (342), a second double seal (392) and a second V-shaped seal (393) between the first pressure cap (343) and the second pressure cap (344), a first V-shaped seal (394) between the first pressure cap (343) and the stop of the roller end external toothed bushing (11), a first round rubber (395) between the first pressure cap (343) and the second pressure cap (344), and a second round rubber (396) between the arc slider (342) and the sleeve (341). The second drum-shaped gear bushing (32) is provided with a protective cover (322) at its left end. The protective cover (322) is fixedly connected by a third connecting plate (323), a chuck (324), and bolts. A V-shaped sealing ring (325) is provided between the left end of the protective cover (322) and the intermediate shaft body (31). The first drum-shaped gear bushing (33) is fixed on the spring rod (37) by a retaining ring (326) and a retaining ring (328). The left end of the spring rod (37) abuts against the spring (38), and the right end is fixed to the second connecting plate (23) and the top block (327).

2. The large telescopic internal circulation transmission shaft according to claim 1, characterized in that, The outer surface of the right end of the intermediate shaft body (31) is provided with an external spline (311), and the inner surface of the left end of the second drum-shaped gear sleeve (32) is provided with an internal spline (321). The large expansion and contraction are achieved by the cooperation of the external spline (311) and the internal spline (321). The right end face of the intermediate shaft body (31) is fixedly connected to the first positioning ring (361) by bolts, and the left end face of the second drum-shaped gear sleeve (32) is connected to the second positioning ring (362) by interference fit. The oil inlet ring (35) is set on the intermediate shaft body (31). The oil inlet ring (35) connects the first oil passage (40) and the second oil passage (50). The first oil passage (40) lubricates the drum-shaped teeth at the end of the roller and returns to the oil collection tank (60) through the gap between the intermediate shaft body (31) and the sleeve (341). The second oil passage (50) lubricates the spline pair and the toothed drum teeth, which then return to the oil collection tank (60).

3. The large telescopic internal circulation transmission shaft according to claim 2, characterized in that, The spring rod (37) is provided with multiple oil inlet holes (371), and the oil inlet holes (371) are connected to the second oil passage (50).

4. The large telescopic internal circulation transmission shaft according to claim 3, characterized in that, An oil groove is provided on the outside of the sleeve (341) to throw the thin oil into the oil collection tank (60).

5. The large telescopic internal circulation transmission shaft according to claim 4, characterized in that, A gap is provided between the first positioning ring (361) and the inner hole of the second drum-shaped toothed bushing (32).

6. The large telescopic internal circulation transmission shaft according to claim 5, characterized in that, An oil injector (329) is provided on each of the top blocks (327) on both sides of the intermediate shaft body (31).

7. The large telescopic internal circulation transmission shaft according to claim 6, characterized in that, The roller end external toothed bushing (11) adopts an integral structure.

8. A transmission device, characterized in that, Includes the large telescopic internal circulation transmission shaft as described in any one of claims 1 to 7.

9. A continuous rolling mill unit, characterized in that, Includes the transmission device as described in claim 8.

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