Large telescopic internal circulation transmission connecting shaft, transmission device and continuous rolling unit

Abstract

The invention discloses a large telescopic internal circulation transmission connecting shaft, a transmission device and a continuous rolling unit, and belongs to the technical field of rolling mill transmission shafts. The intermediate shaft assembly of the connecting shaft comprises a swing angle component, wherein the swing angle component comprises a sleeve, an arc sliding block, a first gland and a second gland; a sleeve is arranged on the outer side of the intermediate shaft body, the left side of the sleeve is matched with the arc sliding block and fixed through a shaft check ring, the right side of the sleeve is fixed to the circular ring and combined through a bolt, and the sleeve is provided with a through hole and matched with an oil retainer. The arc sliding block is fixed in a threaded hole of the roller end outer tooth shaft sleeve through the first gland and the second gland by using a long stud, and the arc sliding block, the first gland and the second gland can slide relative to each other. Wherein the arc sliding block can realize a swing angle function; the first gland and the second gland which are used for fixing the arc sliding block are of a split structure, and online sealing replacement can be achieved by disassembling bolts.

Description

Technical Field

[0001] The present invention belongs to the technical field of rolling mill transmission shafts, and more specifically, relates to a large telescopic inner circulation transmission coupling shaft, a transmission device and a continuous rolling mill group. Background Art

[0002] With the development of advanced technology in modern metallurgical production, high automation, high efficiency and high precision rolling equipment are needed, which poses new challenges to the related spare parts industry. For finishing rolling mills, continuous casting and rolling mills and cold rolling mills, since the main drive shaft is the key transmission component of the entire set of continuous rolling equipment, its performance, function, quality and stability are directly related to the output and quality of plate and strip products, and directly affect its service life.

[0003] It is well known that drum gear couplings are widely used as mechanical transmission parts for steel rolling machinery in hot rolling finishing mills. According to their structural forms, they are roughly divided into two categories: thin oil-lubricated drum gear couplings and dry oil-lubricated drum gear couplings. Among them, thin oil-lubricated drum gear couplings 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 coupling 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 cover, and a first gap is provided between the first drum-shaped tooth and the first end cover; the second transmission shaft is provided with a second slip ring, a second drum-shaped tooth and a second end cover, and a second gap is provided between the second drum-shaped tooth and the second end cover; 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 conveys lubricating oil to the first transmission shaft and the second transmission shaft respectively through the first slip ring and the second slip ring, and after the lubricating oil passes 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, and the lubricating oil finally flows into the lubricating oil recovery tank through the first gap and the second gap to realize the circulation of the lubricating oil.

[0005] For another example, Chinese patent CN111570522A discloses an internal circulation heavy-duty drum-shaped gear coupling, comprising: a roller end assembly, a tooth end assembly, and a transmission shaft; the transmission shaft is a split type; a hydraulic mechanism is provided between the transmission shaft and the tooth end assembly, and the hydraulic mechanism can push and pull the transmission shaft to move left and right; the transmission shaft comprises a roller end shaft head of the roller end assembly connected to a drum-shaped tooth; a tooth end shaft head of the tooth end assembly connected to a drum-shaped tooth; a pipe connected between the roller end shaft head and the tooth end shaft head; the hydraulic mechanism is a hydraulic cylinder connected to the left end of the tooth 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 tooth end assembly.

[0006] For another example, Chinese patent CN204035193U discloses an internal circulation thin oil lubricated drum gear coupling which enhances the oil return effect, improves the lubrication conditions, and simplifies the oil circuit structure in the shaft body. The coupling includes a roller 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 roller connection end has a first oil chamber and a third oil chamber; the transmission connection end has a second oil chamber and a fourth oil chamber; the first oil chamber is connected to the third oil chamber; the second oil chamber is connected to the fourth oil chamber; the intermediate shaft has a central through hole; the central through hole connects the first oil chamber and the second oil chamber; an oil return channel deviating from the center axis of the intermediate shaft is arranged in the intermediate shaft; the oil return channel connects the third oil chamber and the second oil chamber.

[0007] However, the above disclosed internal circulation telescopic main transmission coupling shafts all use drum-shaped gear telescopic, which has a limited telescopic range and cannot achieve a large telescopic function; at the same time, in some scenarios, due to vibration, there is a small angle deviation between the transmission end and the roller end, and the current rigid connection relationship of the coupling shaft is very easy to cause wear. In view of this, it is necessary to develop a large telescopic internal circulation transmission coupling shaft to overcome the above defects. Summary of the invention

[0008] 1. Problem to be solved

[0009] In view of the technical problem that large telescopic extension cannot be achieved in the prior art, the present invention provides a large telescopic internal circulation transmission coupling shaft, which can realize the swing angle function, so that the transmission end and the roller end can be adjusted at a small angle to reduce wear.

[0010] In addition, the present invention can also realize the internal circulation large telescopic function, and at the same time adopts thin oil lubrication, and 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 shaft.

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

[0013] 2. Technical solution

[0014] In order 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 coupling shaft, comprising a roller end assembly, an intermediate shaft assembly and a tooth end assembly; the roller end assembly, the intermediate shaft assembly, the tooth end assembly, the first oil circuit, the second oil circuit and an oil collecting tank;

[0016] The roller end assembly comprises a roller end external gear sleeve, a roller end sleeve and a first connecting plate;

[0017] The tooth end assembly includes a tooth end inner gear ring, a tooth end outer gear shaft sleeve, a second connecting plate and a third gland;

[0018] The intermediate shaft assembly includes a swing angle component, which includes a sleeve, an arc slider, a first pressure cover and a second pressure cover; a sleeve is arranged on the outside of the intermediate shaft body, the left side of the sleeve cooperates with the arc slider and is fixed by a retaining ring through the shaft, and the right side is fixed on the circular ring and bolted together, the sleeve is provided with a through hole and is matched with an oil retaining ring; the arc slider is fixed in the threaded hole of the outer gear sleeve at the roller end through the first pressure cover and the second pressure cover with a long stud, and the arc slider and the first pressure cover and the second pressure cover can slide relative to each other.

[0019] According to any embodiment of the first aspect of the present invention, the intermediate shaft assembly further comprises an intermediate shaft body, a second crown gear sleeve and a first crown gear sleeve, a sealing assembly, an oil inlet ring, a first locating ring and a second locating ring;

[0020] The outer surface of the right end of the intermediate shaft body is provided with an external spline, and the inner surface of the left end of the second drum-shaped gear shaft sleeve is provided with an internal spline, and the large telescopic movement is achieved by the cooperation of the external spline and the internal spline; the right end surface of the intermediate shaft body is fixedly connected with the first positioning ring by bolts, and the left end surface of the second drum-shaped gear shaft sleeve is interference fit with the second positioning ring;

[0021] The sealing assembly includes a first double seal provided between the arc slider and the first gland, a second double seal and a second V-shaped seal provided between the arc slider and the second gland, a first V-shaped seal provided between the first gland and the stopper of the roller end external gear sleeve, a first round rubber provided between the first gland and the second gland, and a second round rubber provided between the arc slider and the sleeve;

[0022] The oil inlet ring is arranged on the intermediate shaft body, and the oil inlet ring connects the first oil circuit and the second oil circuit. The first oil circuit lubricates the drum-shaped teeth of the first drum-shaped gear sleeve and returns to the oil collecting 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 sleeve and returns them to the oil collecting tank.

[0024] The design of the above-mentioned first oil circuit can provide an effective lubrication mechanism for the arc slider of the swing angle component, so that the arc slider is immersed in thin oil as much as possible, and a lubricating oil film layer is always formed between the top surface of the arc slider and the inner arc surfaces of the first pressure cover and the second pressure cover, thereby ensuring the smoothness of small-angle swing. At the same time, the first double seal, the second double seal, the second V-shaped seal, the first round rubber and the second round rubber are used to form a sealing structure, which effectively solves the problem of thin oil leakage.

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

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

[0027] According to any implementation scheme of the first aspect of the present invention, a plurality of oil inlet holes are provided on the spring rod, and the oil inlet holes are connected to the second oil circuit.

[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 the thin oil into the oil collecting 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 gear sleeve.

[0030] According to any implementation scheme of the first aspect of the present invention, an oil injection nozzle is respectively provided on the top blocks on both sides of the intermediate shaft body.

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

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

[0033] 3. Beneficial effects

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[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 gland and the second gland for fixing the arc slider are split 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 structure replaces the drum-shaped tooth telescopic structure, 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 the sealing; the multiple sealing structure increases the reliability of the sealing;

[0037] (3) The large telescopic internal circulation transmission shaft of the present invention takes in oil from the oil inlet ring and is divided into two paths from the middle. The left path lubricates the drum-shaped teeth at the roller end and returns to the oil collecting 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. The 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 coupling shaft of the present invention is designed with a split protective cover at the spline pair, so that the thin oil can lubricate the spline without flowing into the oil collecting tank from here, and return to the oil collecting tank from the drum gear, thereby fully lubricating the drum gear at the tooth end. 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 coupling shaft of the present invention has double positioning designs on the right side spline tail of the intermediate shaft body and the left end of the first drum-shaped gear sleeve, which plays a positioning role when the spline is telescopic, making the coupling shaft more stable during operation;

[0040] (6) The invention adopts a large telescopic internal circulation transmission shaft, an outer gear sleeve at the roller end and a retaining ring as an integral structure, thereby avoiding the tightening of the bolts during online maintenance;

[0041] (7) The large telescopic internal circulation transmission coupling shaft of the present invention has an oil collecting tank with a split structure, which is composed of three parts. The lower part adopts an integral structure, and the bottom surface adopts an inclined surface, which is conducive to the smooth entry of thin oil into the hydraulic station from the oil outlet, thereby realizing circulation; the upper part adopts a split structure, which is convenient for installation and disassembly;

[0042] (8) The large telescopic internal circulation transmission coupling shaft of the present invention has an outer gear shaft sleeve at the right end fixed to the spring shaft assembly rod by a retaining ring through a hole, and the left end of the spring rod is pressed by the elastic force of the spring, and the right end is fixed by the second connecting plate and the top block, and the outer gear shaft sleeve at the left end is fixed to the intermediate shaft body by a shaft retaining ring and a retaining ring;

[0043] (9) In the large telescopic internal circulation transmission coupling shaft of the present invention, an oil spray nozzle is respectively provided on the oil circuits on both sides of the intermediate shaft body to control the lubrication flow on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0045] Figure 1 It is a schematic diagram of the structure of a large telescopic inner circulation transmission shaft in the prior art;

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

[0047] Figure 3 It is a cross-sectional view along line AA;

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

[0049] Figure 5 It 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 Schematic diagram of the enlarged structure of part C;

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

[0052] Figure 8 for Figure 5 Schematic diagram of the enlarged structure of part E;

[0053] Description of reference numerals:

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

[0055] 20. Tooth end assembly; 21. Tooth end inner gear ring; 22. Tooth end outer gear sleeve; 23. Second connecting plate; 24. Third gland;

[0056] 30. Intermediate shaft assembly; 31. Intermediate shaft body; 311. External spline; 32. Second drum gear sleeve; 321. Internal spline; 322. Protective cover; 323. Third connecting plate; 324. Chuck; 325. V-shaped sealing ring; 326. Hole retaining ring; 327. Top block; 328. Retaining ring; 329. Oil injection nozzle; 33. First drum gear sleeve; 34. Swing angle component; 341. Sleeve; 342. Arc slider; 343. First gland ; 344, second gland; 345, shaft retaining ring; 346, oil retaining ring; 347, round 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 round rubber; 396, second round rubber;

[0057] 40. First oil circuit; 50. Second oil circuit; 60. Oil collecting tank. DETAILED DESCRIPTION

[0058] The following detailed description of exemplary embodiments of the present invention refers to the accompanying drawings, which form a part of the description, and in which exemplary embodiments of the present invention that can be implemented are shown as examples. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement the present invention, it should be understood that other embodiments can be implemented and various changes can be made to the present invention without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but is only for the purpose of illustrating and not limiting the description of the characteristics and features of the present invention, so as to propose the best mode for performing the present invention and to enable those skilled in the art to implement the present invention. Therefore, the scope of the present invention is limited only by the appended claims.

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

[0060] like Figures 1 to 8 As shown, the large telescopic inner circulation transmission coupling shaft of the present embodiment includes a roller end assembly 10, an intermediate shaft assembly 30, a tooth end assembly 20, a first oil circuit 40, a second oil circuit 50 and an oil collecting tank 60, wherein the roller end assembly 10 and the tooth 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 roller end assembly 10 and the tooth end assembly 20, wherein the roller end assembly 10 end is the rolling roller end, and the tooth end assembly 20 end is the transmission end, and the above-mentioned external equipment includes but is not limited to a rolling mill. The large telescopic inner circulation transmission coupling shaft of the present embodiment can be used as a transmission device of a continuous rolling mill, mainly involving major metallurgical equipment such as hot continuous rolling mills and cold continuous rolling mills.

[0061] Among them, Figure 1 and Figure 5 As shown, the roller end assembly 10 includes a roller end outer gear sleeve 11, a roller end sleeve 12 and a first connecting plate 13; the roller end outer gear sleeve 11 has an inner cavity, the roller end of the intermediate shaft assembly 30 is installed with the roller end sleeve 12, the roller end sleeve 12 is adapted to the inner cavity of the roller end outer gear sleeve 11, the first connecting plate 13 is installed in the inner cavity of the roller end outer gear sleeve 11 and is sealed with the inner cavity of the roller end outer gear sleeve 11, an oil cavity A is provided between the first connecting plate 13 and the end face of the roller end of the intermediate shaft assembly 30, and the oil cavity A is connected to the first oil circuit 40.

[0062] Furthermore, the tooth end assembly 20 includes a tooth end inner gear ring 21, a tooth end outer gear shaft sleeve 22, a second connecting plate 23 and a third pressure cover 24; the tooth end inner gear ring 21 has an inner cavity; the transmission end of the intermediate shaft assembly 30 is installed with a second drum-shaped tooth shaft sleeve 32; the second drum-shaped tooth shaft sleeve 32 is adapted to the inner cavity of the tooth end inner gear ring 21, the second connecting plate 23 is installed in the inner cavity of the tooth end inner gear ring 21 and is sealed with the inner cavity of the tooth end inner gear ring 21, an oil cavity B is provided between the second connecting plate 23 and the end face of the transmission end of the intermediate shaft assembly 30, and the oil cavity B is connected to the second oil circuit 50; a third pressure cover 24 is provided on the tooth end inner gear ring 21.

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

[0064] In order to better collect the thin oil, an oil groove is provided on the outside of the sleeve 341 for throwing the thin oil into the oil collecting tank 60 .

[0065] The arc slider 342 of the present invention has an arc surface, which 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 split 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 gear sleeve 32 and a first drum gear sleeve 33 , a sealing assembly 39 , an oil inlet ring 35 , a first positioning ring 361 and a second positioning ring 362 .

[0067] Further, combined with 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 side surface of the left end of the second drum-shaped gear shaft sleeve 32 is provided with an internal spline 321, and the large extension and contraction can be 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 with the first positioning ring 361 by bolts, and preferably, a gap is provided between the first positioning ring 361 and the inner hole of the second drum-shaped gear shaft sleeve 32, so as to ensure that the first positioning ring 361 and the second drum-shaped gear shaft sleeve 32 do not interfere with each other during extension and contraction, and the left end face of the second drum-shaped gear shaft sleeve 32 is interference-fitted with the second positioning ring 362; the double positioning design of the right side spline tail of the intermediate shaft body 31 and the left end of the first drum-shaped gear shaft sleeve 33 is realized, which plays a positioning role when the spline is extended and contracted, and makes the stability of the connecting shaft better during operation.

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

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

[0070] The design of the above-mentioned first oil circuit 40 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, and 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 cover 343 and the second pressure cover 344, thereby ensuring the smoothness of small-angle swing. At the same time, the first double seal 391, the second double seal 392, the second V-shaped seal 393, the first round rubber 395 and the second round rubber 396 are used to form a sealing structure, which effectively solves the problem of thin oil leakage.

[0071] exist Figure 3 In the figure, the oil collecting tank 60 adopts a split structure and consists of three parts. The lower part adopts an integral structure and the bottom surface adopts an inclined surface, which is conducive to the smooth entry of thin oil into the hydraulic station from the oil outlet, 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 gear sleeve 32, and the protective cover 322 is fixedly connected through 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 gear sleeve 33 is fixed to the spring rod 37 through a hole with 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, a plurality of oil inlet holes 371 are provided on the spring rod 37, and the oil inlet holes 371 are connected to the second oil circuit 50.

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

[0074] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A large telescopic internal circulation transmission coupling shaft, comprising a roller end assembly (10), an intermediate shaft assembly (30), a tooth end assembly (20), a first oil circuit (40), a second oil circuit (50) and an oil collecting tank (60); characterized in that: The intermediate shaft assembly (30) comprises a swing angle component (34), and the swing angle component (34) comprises a sleeve (341), an arc slider (342), a first pressure cover (343) and a second pressure cover (344); A sleeve (341) is arranged outside the intermediate shaft body (31); the left side of the sleeve (341) cooperates with the arc slider (342) and is fixed by a shaft retaining ring (345); the right side of the sleeve (341) is fixed on a circular ring (347) and is bolted together; a through hole is arranged on the sleeve (341) and is matched with an oil retaining ring (346); The arc slider (342) is fixed in the threaded hole of the roller end external gear sleeve (11) by a long stud through a first pressure cover (343) and a second pressure cover (344), and the arc slider (342) and the first pressure cover (343) and the second pressure cover (344) can slide relative to each other.

2. The large telescopic inner circulation transmission shaft according to claim 1 is characterized in that: The intermediate shaft assembly (30) further comprises an intermediate shaft body (31), a second drum-shaped gear shaft sleeve (32), a first drum-shaped gear shaft sleeve (33), a sealing assembly (39), an oil inlet ring (35), a first positioning ring (361), and a second positioning ring (362); 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 shaft sleeve (32) is provided with an internal spline (321), and large telescopic movement is achieved by the cooperation between the external spline (311) and the internal spline (321); the right end surface of the intermediate shaft body (31) is fixedly connected to the first positioning ring (361) by bolts, and the left end surface of the second drum-shaped gear shaft sleeve (32) is interference-fitted with the second positioning ring (362); The sealing assembly (39) comprises a first double seal (391) provided between the first pressure cover (343) and the arc slider (342), a second double seal (392) and a second V-shaped seal (393) provided between the first pressure cover (344), a first V-shaped seal (394) provided between the first pressure cover (343) and the stopper of the roller end external gear sleeve (11), a first round rubber (395) provided between the first pressure cover (343) and the second pressure cover (344), and a second round rubber (396) provided between the arc slider (342) and the sleeve (341); The oil inlet ring (35) is arranged on the intermediate shaft body (31), and the oil inlet ring (35) connects the first oil circuit (40) and the second oil circuit (50). The first oil circuit (40) lubricates the drum-shaped teeth at the roller end and returns to the oil collecting tank (60) through the gap between the intermediate shaft body (31) and the sleeve (341); The second oil circuit (50) lubricates the spline pair and the crowned teeth at the tooth end and returns to the oil collecting tank (60).

3. The large telescopic inner circulation transmission shaft according to claim 1 is characterized in that: A protective cover (322) is arranged at the left end of the second drum-shaped gear shaft sleeve (32), and the protective cover (322) is fixedly connected via a third connecting disk (323), a chuck (324) and bolts. A V-shaped sealing ring (325) is arranged between the left end of the protective cover (322) and the intermediate shaft body (31). The first drum-shaped gear shaft sleeve (33) is fixed to the spring rod (37) via a retaining ring (326) and a retaining ring (328) through a hole. The left end of the spring rod (37) abuts against the spring (38), and the right end is fixed to the second connecting disk (23) and the top block (327).

4. The large telescopic inner circulation transmission coupling according to claim 3 is characterized in that: The spring rod (37) is provided with a plurality of oil inlet holes (371), and the oil inlet holes (371) are connected to the second oil circuit (50).

5. The large telescopic inner circulation transmission coupling according to claim 4 is characterized in that: An oil groove is arranged outside the sleeve (341) for throwing the thin oil into the oil collecting tank (60).

6. The large telescopic inner circulation transmission coupling according to claim 5 is characterized in that: A gap is provided between the first positioning ring (361) and the inner hole of the second drum-shaped gear shaft sleeve (32).

7. The large telescopic inner circulation transmission coupling according to claim 6 is characterized in that: An oil spray nozzle (329) is respectively provided on the top blocks (327) on both sides of the intermediate shaft body (31).

8. The large telescopic inner circulation transmission coupling according to claim 7 is characterized in that: The roller end external gear sleeve (11) adopts an integral structure.

9. A transmission device, characterized in that: It comprises the large telescopic internal circulation transmission coupling shaft as described in any one of claims 1 to 8.

10. A continuous rolling mill, characterized in that: Includes the transmission device as claimed in claim 9.

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