Ball cage coupling assembly with ball spline structure for rolling mill

Abstract

A ball cage coupling assembly with a ball spline structure for a rolling mill is used in the technical field of metallurgical rolling and comprises a roller end ball cage assembly, an intermediate shaft, a ball spline assembly and a motor end ball cage assembly. The roller end ball cage assembly and the middle shaft are connected through spigot positioning and a flange, the middle shaft and the ball spline assembly are connected through spigot positioning and a flange, and the ball spline assembly and the motor end ball cage assembly are connected through spigot positioning and a flange. When the ball spline assembly is not in a horizontal state, the retainer I is always in a middle optimal working area; a self-resetting mechanism is arranged in the ball spline assembly, so that the ball spline assembly has a self-resetting function; when the ball cage coupling assembly rotates at a high speed and the dynamic balance amount is increased, the positioning ring at the shaft end of the spline sleeve can effectively avoid vibration generated by the ball cage coupling assembly; and a universal ball structure is additionally arranged in the motor end ball cage assembly, so that the abrasion of a bottom base plate can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission, in particular to a constant velocity joint coupling assembly with a ball spline structure for rolling machinery of metallurgical equipment. Background Art

[0002] At present, the transmission couplings in the field of metallurgical machinery mainly include cardan shaft couplings or drum gear couplings. The axial length compensation of the couplings is usually achieved by the telescoping of an intermediate sliding spline or the small telescoping of the universal joint itself. The disadvantage of this length compensation method is that when the coupling undergoes axial telescoping or has a tendency of axial telescoping, it is a sliding friction, and the friction coefficient is large; in addition, the torque of the rolling mill drive shaft is usually very large, and thus a large axial force will be generated. Therefore, when the drive shaft works under the conditions of large torque, frequent telescoping, and large axial force for a long time, the service life of the drive shaft will be greatly reduced. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the invention object of the utility model is to provide a constant velocity joint coupling assembly with a ball spline structure for a rolling mill, which can greatly reduce the axial force generated due to length change during the operation of the coupling and greatly improve the service life of the drive shaft.

[0004] To achieve the above invention object, the constant velocity joint coupling assembly of the utility model includes a roller end constant velocity joint assembly, an intermediate shaft, a ball spline assembly, and a motor end constant velocity joint assembly; a spigot positioning and flange connection is adopted between the roller end constant velocity joint assembly and the intermediate shaft, a spigot positioning and flange connection is adopted between the intermediate shaft and the ball spline assembly, and a spigot positioning and flange connection is adopted between the ball spline assembly and the motor end constant velocity joint assembly.

[0005] Further, the ball spline assembly consists of a ball spline shaft, a spline sleeve shaft end positioning ring, an outer protective retaining ring, a root spring, a ball spline sleeve, a first steel ball, a first cage, an end spring, an oil cup, a spline sleeve root positioning ring, an end mandrel, an end mandrel stop block, a mandrel spring, a bottom mandrel, and a spline sleeve; the first steel ball between the ball spline shaft and the ball spline sleeve is embedded in the ball sockets of the first cage; the end flange of the spline sleeve shaft end positioning ring provided at the end of the ball spline assembly is fixed to one end of the ball spline sleeve by screws, and the cylindrical part is sleeved between the outer circle of the ball spline shaft and the inner circle of the ball spline sleeve; the end flange of the outer protective retaining ring is fixed to one end of the spline sleeve by screws, and the cylindrical part is sleeved between the inner circle of the spline sleeve and the outer circle of the ball spline sleeve, and the other end of the spline sleeve is welded to the ball spline shaft; a root spring is provided between the end of the cylindrical part of the positioning ring and one end of the first cage, and an end spring is provided between the other end of the first cage and the root positioning ring. The root positioning ring is fixed to the other end of the ball spline sleeve by screws, and an oil cup is installed on the ball spline sleeve; the end mandrel and the bottom mandrel are installed in the inner cavity of the ball spline shaft, the bottom mandrel is positioned in the stepped hole of the ball spline shaft, a mandrel spring is provided between the end mandrel and the bottom mandrel, the mandrel spring is sleeved on the bottom mandrel, the end mandrel and the end mandrel stop block are in sliding fit, and the end mandrel stop block is fixed to the ball spline shaft by screws.

[0006] Further, the ball spline assembly consists of multiple raceways.

[0007] Further, the spherical diameter φa of the ball sockets of the first cage is larger than the diameter φb of the first steel ball, and the difference between φa and φb is 1 to 1.5 mm; the first cage is made of nylon material and is injection molded; reinforcing ribs are provided between the ball sockets at the ball socket positions of the first cage, between the ball sockets and the end face of the first cage, and grooves are provided on the reinforcing ribs between the ball sockets; the inner opening φc and the outer opening φd of the ball socket are smaller than the diameter φb of the first steel ball, the difference between φc and φb is 2 to 3.5 mm, and the difference between φd and φb is 4 to 5.5 mm; the ball sockets of the first cage are arranged in multiple circles, with multiple ball sockets in each circle.

[0008] Further, the spline sleeve shaft end positioning ring is an annular part, and the fit tolerance between the outer cylindrical surface of its end flange and the inner cylindrical surface of the spline sleeve is H8 / h7, and the fit tolerance between the inner cylindrical surface of the cylindrical part and the outer cylindrical surface of the ball spline shaft is H8 / h7; the main body of the spline sleeve shaft end positioning ring is made of brass material, and multiple graphite columns are evenly embedded in the cylindrical part.

[0009] Furthermore, a universal ball structure is provided inside the roller end constant velocity joint assembly and the motor end constant velocity joint assembly. A ball socket is provided at the axis of the inner sleeve of the constant velocity joint of the universal ball structure, and small steel balls are densely arranged in the ball socket. The small steel balls are placed between the large steel balls and the inner sleeve of the constant velocity joint. The first gland is fixed to the inner sleeve of the constant velocity joint by screws. The large steel balls are in arc contact with the small steel balls, the first gland, and the bottom backing plate. The bottom backing plate is positioned in the stepped hole of the outer sleeve of the constant velocity joint. An oil cup II is provided on the outer sleeve of the constant velocity joint. The outer sleeve of the constant velocity joint is fixed to the ball spline sleeve by screws. The second steel balls between the inner sleeve and the outer sleeve of the constant velocity joint are embedded in the ball socket structure of the second cage. The second gland is fixed to the end of the outer sleeve of the constant velocity joint. A bowl-shaped sealing ring is provided between the second gland and the inner sleeve of the constant velocity joint. An oil cup III is provided on the second gland.

[0010] Compared with the prior art, the present utility model has the following advantages:

[0011] Root springs and end springs for resetting are provided at both ends of the first cage. When the ball spline assembly is not in a horizontal state, it is used to keep the first cage always in the optimal working area under the action of gravity.

[0012] A self-resetting mechanism is additionally provided inside the ball spline assembly, enabling the ball spline assembly to have a self-resetting function when telescoping. Under the elastic force of the core shaft spring, the components inside the constant velocity joint coupling assembly can always remain in contact.

[0013] A spline sleeve shaft end positioning ring is provided at the end of the ball spline assembly. When the constant velocity joint coupling assembly rotates at high speed, causing an increase in the dynamic balance, the spline sleeve shaft end positioning ring can effectively avoid the vibration generated by the constant velocity joint coupling assembly.

[0014] A universal ball structure is additionally provided inside the motor end constant velocity joint assembly. When the roller end and the motor end constant velocity joint assemblies rotate, the universal ball structure contacts the bottom backing plate through the large steel balls, generating rolling friction. On the one hand, it can reduce the frictional resistance when the motor end constant velocity joint assembly rotates, and on the other hand, it can also reduce the wear of the bottom backing plate.

[0015] The spherical diameter of the ball socket of the first cage is slightly larger than the diameter of the steel balls, which can effectively ensure that the steel balls can rotate flexibly after being assembled into the ball socket of the first cage; grooves are provided on the outer reinforcing ribs between the ball sockets to facilitate the assembly of the steel balls into the ball sockets; the inner and outer openings of the ball sockets are smaller than the diameter of the steel balls, which can prevent the steel balls from detaching from the ball sockets. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural schematic diagram of the present utility model.

[0017] Figure 2 is Figure 1 the structural schematic diagram of the ball spline assembly.

[0018] Figure 3 isFigure 2 Cross-sectional view of the ball spline.

[0019] Figure 4 For Figure 1 Schematic diagram of the connection structure at the mating surface A between the roller end constant velocity joint assembly and the intermediate shaft.

[0020] Figure 5 For Figure 1 Schematic diagram of the connection structure at the mating surface B between the intermediate shaft and the ball spline assembly.

[0021] Figure 6 For Figure 1 Schematic diagram of the connection structure at the mating surface C between the ball spline assembly and the motor end constant velocity joint assembly.

[0022] Figure 7 For Figure 1 Schematic diagram of the structure of cage one.

[0023] Figure 8 For Figure 1 Assembly diagram of cage one and the steel balls.

[0024] Figure 9 For Figure 1 Assembly diagram of the motor end constant velocity joint assembly.

[0025] Figure 10 For Figure 1 Schematic diagram of the positioning ring at the end of the spline sleeve shaft.

[0026] In the figure: 1. Roller end constant velocity joint assembly; 2. Intermediate shaft; 3. Ball spline assembly; 4. Motor end constant velocity joint assembly; 5. Ball spline shaft; 6. Positioning ring at the end of the spline sleeve shaft; 7. Outer protective retaining ring; 8. Root spring; 9. Ball spline sleeve; 10. Steel ball one; 11. Cage one; 12. End spring; 13. Oil cup one; 14. Root positioning ring of the spline sleeve; 15. End core shaft; 16. End core shaft stop block; 17. Core shaft spring; 18. Bottom core shaft; 19. Inner constant velocity joint housing; 20. Small steel ball; 21. Large steel ball; 22. Cover one; 23. Bottom backing plate; 24. Spline sleeve; 25. Reinforcing rib; 26. Groove; 27. Graphite column; 28. Oil cup two; 29. Outer constant velocity joint housing; 30. Steel ball two; 31. Cage two; 32. Cover two; 33. Bowl-shaped sealing ring; 34. Oil cup three. Detailed implementation manners

[0027] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 ,Figure 10 As shown in the figure, the constant velocity joint coupling assembly of the present utility model mainly includes a roller end constant velocity joint assembly 1, an intermediate shaft 2, a ball spline assembly 3, a motor end constant velocity joint assembly 4, etc. The roller end constant velocity joint assembly 1 and the intermediate shaft 2 are positioned by a spigot and connected by a flange. The intermediate shaft 2 and the ball spline assembly 3 are positioned by a spigot and connected by a flange. The ball spline assembly 3 and the motor end constant velocity joint assembly 4 are positioned by a spigot and connected by a flange. The combined connection form of combining a spigot with a flange between each component can make the disassembly of the constant velocity joint coupling assembly more convenient, and can be maintained or replaced separately, providing great convenience for actual use. When the total length of the constant velocity joint coupling needs to be adjusted to meet the actual requirements, the length requirement can be met by adjusting the length of the intermediate shaft 2, further improving the standardization degree and versatility of the product.

[0028] The ball spline assembly 3 mainly consists of a ball spline shaft 5, a spline sleeve shaft end positioning ring 6, an outer protective retaining ring 7, a root spring 8, a ball spline sleeve 9, a first steel ball 10, a first cage 11, an end spring 12, an oil cup 13, a spline sleeve root positioning ring 14, an end mandrel 15, an end mandrel stop block 16, a mandrel spring 17, a bottom mandrel 18, a spline sleeve 24, etc. The ball spline assembly 3 is composed of a total of twelve raceways, and can also be set to six, eight or ten according to needs. The first steel ball 10 between the ball spline shaft 5 and the ball spline sleeve 9 is embedded in the ball sockets of the first cage 11; the end flange of the spline sleeve shaft end positioning ring 6 provided at the end of the ball spline assembly 3 is fixed to one end of the ball spline sleeve 9 by screws, and the cylindrical part is sleeved between the outer circle of the ball spline shaft 5 and the inner circle of the ball spline sleeve 9; the end flange of the outer protective retaining ring 7 is fixed to one end of the spline sleeve 24 by screws, and the cylindrical part is sleeved between the inner circle of the spline sleeve 24 and the outer circle of the ball spline sleeve 9, and the other end of the spline sleeve 24 is welded to the ball spline shaft 5; a root spring 8 is provided between the end of the cylindrical part of the positioning ring 6 and one end of the first cage 11, and an end spring 12 is provided between the other end of the first cage 11 and the root positioning ring 14. The root positioning ring 14 is fixed to the other end of the ball spline sleeve 9 by screws, and the oil cup 13 is installed on the ball spline sleeve 9; the end mandrel 15 and the bottom mandrel 18 are installed in the inner cavity of the ball spline shaft 5, the bottom mandrel 18 is positioned in the stepped hole of the ball spline shaft 5, a mandrel spring 17 is provided between the end mandrel 15 and the bottom mandrel 18, the mandrel spring 17 is sleeved on the bottom mandrel 18, and the end mandrel 15 and the end mandrel stop block 16 are in sliding fit, and the end mandrel stop block 16 is fixed to the ball spline shaft 5 by screws. During the telescopic process of the ball spline assembly 3, if the ball spline assembly 3 is not in a horizontal state, the first cage 11 usually moves slowly to the lower side under the action of gravity. When it reaches a certain degree, the first cage 11 contacts the shaft end limit, resulting in the inability of the first steel ball 10 to roll. At this time, the telescopic movement of the ball spline assembly 3 becomes sliding friction. To solve this problem, root springs 8 and end springs 12 for resetting are provided at both ends of the first cage 11 to keep the first cage 11 always in the optimal working area in the middle under the action of gravity. And, the self-resetting mechanism composed of the end mandrel 15, the end mandrel stop block 16, the mandrel spring 17, and the bottom mandrel 18 inside the ball spline assembly 3 enables the ball spline assembly 3 to have a self-resetting function during telescoping. The roller end ball cage assemblies 1 and the motor end ball cage assemblies 4 at both ends of the ball cage coupling assembly itself have a small displacement compensation function, but cannot be reset. When the displacement accumulates to a certain extent, interference will occur inside the ball cage coupling assembly, and then the internal swing angle of the ball cage coupling assembly will be limited. Adding this self-resetting mechanism can keep all components inside the ball cage coupling assembly in contact under the elastic force of the mandrel spring 17.

[0029] To ensure that the steel ball 10 can rotate flexibly after being assembled into the ball socket of the cage 11, the spherical diameter φa of the ball socket of the cage 11 is slightly larger than the diameter φb of the steel ball 10. Usually, the difference between φa and φb is about 1 - 1.5 mm. The cage 11 is made of nylon material, and the processing method of the cage 11 is injection molding. Reinforcing ribs 25 are provided between the ball sockets of the cage 11 at the ball socket position, and between the ball socket and the end face of the cage 11. Grooves 26 are provided on the reinforcing ribs 25 between the ball sockets. The purpose is to enhance the strength of the cage 11, and when assembling the steel ball 10 from the outside of the ball socket, the reinforcing ribs 25 at the ball socket position can undergo a small amount of elastic deformation to facilitate the assembly of the steel ball 10 into the ball socket. To prevent the steel ball 10 from detaching from the ball socket, the inner opening φc and the outer opening φd of the ball socket are usually smaller than the diameter φb of the steel ball 10, but this difference cannot be too large, otherwise the steel ball 10 cannot be assembled into the ball socket. Usually, the difference between φc and φb is about 2 - 3.5 mm, and the difference between φd and φb is about 4 - 5.5 mm. The ball sockets of the cage 11 are arranged in eight circles, with twelve ball sockets in each circle, for a total of ninety-six ball sockets. The ball sockets of the cage 11 can also be arranged in six circles according to needs, with six, eight, or ten ball sockets in each circle.

[0030] Due to the assembly clearance existing in the ball spline assembly 3 and the generally large length of the mill coupling assembly, when the ball cage coupling assembly rotates at high speed, the dynamic balance amount will increase, resulting in vibration. To solve this problem, a spline sleeve shaft end positioning ring 6 is provided at the end of the ball spline assembly 3. The spline sleeve shaft end positioning ring 6 is an annular part. The fit tolerance between the outer cylindrical surface of the end flange and the inner cylindrical surface of the spline sleeve 24 is H8 / h7, and the fit tolerance between the inner cylindrical surface of the cylindrical part and the outer cylindrical surface of the ball spline shaft 5 is H8 / h7. The main body of the spline sleeve shaft end positioning ring 6 is made of brass material, and a plurality of graphite columns 27 are evenly embedded in its cylindrical part. The spline sleeve shaft end positioning ring 6 can not only assist the coaxiality of the ball spline sleeve 9 and the ball spline shaft 5, but also play a lubricating role and has a certain wear resistance.

[0031] Since a self-resetting mechanism is added inside the ball spline assembly 3, the inner part of the constant velocity joint assembly will always maintain a contact state, resulting in sliding friction. Therefore, a universal ball structure is added inside the roller end constant velocity joint assembly 1 and the motor end constant velocity joint assembly 4, and the structures of the roller end constant velocity joint assembly 1 and the motor end constant velocity joint assembly 4 are the same. A ball socket is provided at the axis of the inner cage 19 of the universal ball structure, and small steel balls 20 are densely arranged in the ball socket. The small steel balls 20 are placed between the large steel ball 21 and the inner cage 19. The first gland 22 is fixed to the inner cage 19 by screws. The large steel ball 21 is in arc surface contact with the small steel balls 20, the first gland 22 and the bottom backing plate 23. The bottom backing plate 23 is positioned in the stepped hole of the outer cage 29. An oil cup II 28 is provided on the outer cage 29. The outer cage 29 is fixed to the ball spline sleeve 9 by screws. The second steel balls 30 between the inner cage 19 and the outer cage 29 are embedded in the ball socket structure of the second cage 31. The second gland 32 is fixed to the end of the outer cage 29. A bowl-shaped sealing ring 33 is provided between the second gland 32 and the inner cage 19. An oil cup III 34 is provided on the second gland 32. When the roller end constant velocity joint assembly 1 and the motor end constant velocity joint assembly 4 rotate, the universal ball structure contacts the bottom backing plate 23 through the large steel ball 21, generating rolling friction. On the one hand, it can reduce the frictional resistance when the roller end constant velocity joint assembly 1 and the motor end constant velocity joint assembly 4 rotate. On the other hand, it can also reduce the wear of the bottom backing plate 23.

Claims

1. A constant velocity joint assembly with a ball spline structure for a rolling mill, characterized in that: The constant velocity joint coupling assembly includes a roller end constant velocity joint assembly (1), an intermediate shaft (2), a ball spline assembly (3), and a motor end constant velocity joint assembly (4); a spigot positioning and flange connection is adopted between the roller end constant velocity joint assembly (1) and the intermediate shaft (2), a spigot positioning and flange connection is adopted between the intermediate shaft (2) and the ball spline assembly (3), and a spigot positioning and flange connection is adopted between the ball spline assembly (3) and the motor end constant velocity joint assembly (4).

2. The ball cage coupling assembly with a ball spline structure for a rolling mill according to claim 1, characterized in that: The ball spline assembly (3) is composed of a ball spline shaft (5), a spline sleeve shaft end positioning ring (6), an outer protective retaining ring (7), a root spring (8), a ball spline sleeve (9), a first steel ball (10), a first cage (11), an end spring (12), an oil cup (13), a spline sleeve root positioning ring (14), an end mandrel (15), an end mandrel stop block (16), a mandrel spring (17), a bottom mandrel (18), and a spline sleeve (24); the first steel ball (10) between the ball spline shaft (5) and the ball spline sleeve (9) is embedded in the ball sockets of the first cage (11); the end flange of the spline sleeve shaft end positioning ring (6) provided at the end of the ball spline assembly (3) is fixed to one end of the ball spline sleeve (9) by screws, and the cylindrical part is sleeved between the outer circle of the ball spline shaft (5) and the inner circle of the ball spline sleeve (9); the end flange of the outer protective retaining ring (7) is fixed to one end of the spline sleeve (24) by screws, and the cylindrical part is sleeved between the inner circle of the spline sleeve (24) and the outer circle of the ball spline sleeve (9), and the other end of the spline sleeve (24) is welded to the ball spline shaft (5); a root spring (8) is provided between the end of the cylindrical part of the positioning ring (6) and one end of the first cage (11), an end spring (12) is provided between the other end of the first cage (11) and the root positioning ring (14), the root positioning ring (14) is fixed to the other end of the ball spline sleeve (9) by screws, and the oil cup (13) is installed on the ball spline sleeve (9); the end mandrel (15) and the bottom mandrel (18) are installed in the inner cavity of the ball spline shaft (5), the bottom mandrel (18) is positioned in the stepped hole of the ball spline shaft (5), a mandrel spring (17) is provided between the end mandrel (15) and the bottom mandrel (18), the mandrel spring (17) is sleeved on the bottom mandrel (18), a sliding fit is provided between the end mandrel (15) and the end mandrel stop block (16), and the end mandrel stop block (16) is fixed to the ball spline shaft (5) by screws.

3. The ball cage coupling assembly with a ball spline structure for a rolling mill according to claim 1, wherein: The ball spline assembly (3) is composed of multiple raceways.

4. The ball cage coupling assembly with a ball spline structure for a rolling mill according to claim 2, wherein: The spherical diameter φa of the ball socket of the first cage (11) is greater than the diameter φb of the first steel ball (10), and the difference between φa and φb is 1 to 1.5 mm; the first cage (11) is made of nylon material and is injection molded; reinforcing ribs (25) are provided between the ball sockets at the ball socket positions of the first cage (11) and between the ball socket and the end face of the first cage (11), and grooves (26) are provided on the reinforcing ribs (25) between the ball sockets; the inner opening φc and the outer opening φd of the ball socket are smaller than the diameter φb of the first steel ball (10), the difference between φc and φb is 2 to 3.5 mm, and the difference between φd and φb is 4 to 5.5 mm; the ball sockets of the first cage (11) are arranged in multiple circles, and there are multiple ball sockets in each circle.

5. The ball cage coupling assembly with a ball spline structure for a rolling mill according to claim 2, wherein: The spline sleeve shaft end positioning ring (6) is an annular part, and the fit tolerance between the outer cylindrical surface of the end flange and the inner cylindrical surface of the spline sleeve (24) is H8 / h7, and the fit tolerance between the inner cylindrical surface of the cylindrical part and the outer cylindrical surface of the ball spline shaft (5) is H8 / h7; the main body of the spline sleeve shaft end positioning ring (6) is made of brass material, and a plurality of graphite columns (27) are evenly embedded in the cylindrical part.

6. The ball cage coupling assembly with a ball spline structure for a rolling mill according to claim 1, characterized in that: The inside of the roller end ball cage assembly (1) and the motor end ball cage assembly (4) is provided with a universal ball structure. A ball socket is provided at the axis of the inner sleeve (19) of the ball cage of the universal ball structure, and small steel balls (20) are densely arranged in the ball socket. The small steel balls (20) are placed between the large steel balls (21) and the inner sleeve (19) of the ball cage. The first gland (22) is fixed to the inner sleeve (19) of the ball cage by screws. The large steel balls (21) are in arc contact with the small steel balls (20), the first gland (22), and the bottom cushion plate (23). The bottom cushion plate (23) is positioned in the stepped hole of the outer sleeve (29) of the ball cage. An oil cup two (28) is provided on the outer sleeve (29) of the ball cage. The outer sleeve (29) of the ball cage is fixed to the ball spline sleeve (9) by screws; the second steel balls (30) between the inner sleeve (19) and the outer sleeve (29) of the ball cage are embedded in the ball socket structure of the second cage (31). The second gland (32) is fixed to the end of the outer sleeve (29) of the ball cage. A bowl-shaped sealing ring (33) is provided between the second gland (32) and the inner sleeve (19) of the ball cage. An oil cup three (34) is provided on the second gland (32).

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