Multi-stage replaceable radial bearing transmission shaft assembly

Abstract

The invention discloses a multi-stage replaceable radial bearing transmission shaft assembly, which relates to the field of petroleum and natural gas well drilling and comprises an outer shell, a transmission shaft, an upper radial shaft moving sleeve and a lower radial shaft moving sleeve, wherein the transmission shaft is arranged in the outer shell, and the transmission shaft and the outer shell are coaxial; the upper radial shaft moving sleeve is located between the outer shell and the transmission shaft and arranged at the upper end of the transmission shaft in a sleeving mode, the upper radial shaft moving sleeve comprises a plurality of first sub-moving sleeves which are connected in series in the axial direction and connected in a clamped mode, the top of each first sub-moving sleeve is provided with a key block, and the bottom of each first sub-moving sleeve is provided with a key groove matched with the key block; the lower radial shaft moving sleeve is located between the outer shell and the transmission shaft and arranged at the lower end of the transmission shaft in a sleeving mode, the lower radial shaft moving sleeve comprises a plurality of second sub-moving sleeves which are connected in series in the axial direction and connected in a clamped mode, a key block is arranged at the bottom of each second sub-moving sleeve, and a key groove matched with the key block is formed in the top of each second sub-moving sleeve. The service life of the transmission shaft assembly can be prolonged.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling, and specifically to a multi-stage replaceable radial bearing drive shaft assembly. Background Technology

[0002] In oil and gas extraction, screw drills are increasingly widely used. A screw drill mainly consists of a motor assembly, a universal joint housing, a universal joint assembly, and a drive shaft assembly. The drive shaft assembly is the power output, driving the drill bit to break rocks. Therefore, the drive shaft assembly is a crucial component of the screw drill, and its structure and performance directly affect the drilling efficiency and service life of the screw drill.

[0003] Currently, the lower and upper radial shaft moving sleeves in the radial shaft bearings of the drive shaft assembly are installed as a single unit within the drive shaft assembly. Because the lower radial shaft bearing can only withstand radial force, and because the drill bit connected to the large end of the drive shaft is subjected to lateral force, the wear-resistant alloy layer of the lower radial shaft bearing's moving sleeve near the large end of the drive shaft wears, while the wear-resistant alloy layer of the lower radial shaft bearing's moving sleeve away from the large end of the drive shaft does not wear, resulting in unnecessary waste. Similarly, because the upper radial shaft bearing can also only withstand radial force, and because the universal joint assembly connected to the small end of the drive shaft is subjected to lateral force, the wear-resistant alloy layer of the upper radial shaft bearing's moving sleeve near the small end of the drive shaft wears, while the wear-resistant alloy layer of the upper radial shaft bearing's moving sleeve away from the small end of the drive shaft does not wear, again resulting in unnecessary waste.

[0004] Therefore, there is an urgent need for a drive shaft assembly that reduces waste during the use of the upper and lower radial shaft sleeves. Summary of the Invention

[0005] This application provides a multi-stage replaceable radial bearing drive shaft assembly, which can solve the technical problem that the upper and lower radial shaft moving sleeves are easily wasted during use in the prior art.

[0006] On one hand, this application provides a multi-stage replaceable radial bearing drive shaft assembly, comprising: a housing; a drive shaft disposed inside the housing and coaxial with the housing; an upper radial shaft moving sleeve located between the housing and the drive shaft and sleeved on the upper end of the drive shaft, the upper radial shaft moving sleeve comprising a plurality of first sub-moving sleeves connected in series along the axial direction and interlocked with each other, each first sub-moving sleeve having a key block at its top and a keyway matching the key block at its bottom; and a lower radial shaft moving sleeve located between the housing and the drive shaft and sleeved on the lower end of the drive shaft, the lower radial shaft moving sleeve comprising a plurality of second sub-moving sleeves connected in series along the axial direction and interlocked with each other, each second sub-moving sleeve having a key block at its bottom and a keyway matching the key block at its top.

[0007] In conjunction with the above embodiments, in one implementation, the multi-stage replaceable radial bearing drive shaft assembly further includes: an upper radial shaft moving sleeve cap, which is sleeved on the drive shaft and located at the top of the upper radial shaft moving sleeve, and the end of the upper radial shaft moving sleeve cap facing the upper radial shaft moving sleeve is provided with a keyway that matches the key block of the adjacent first sub-moving sleeve; and a lower radial shaft moving sleeve base, which is sleeved on the drive shaft and located at the bottom of the lower radial shaft moving sleeve, and the end of the lower radial shaft moving sleeve base facing the lower radial shaft moving sleeve is provided with a keyway that matches the key block of the adjacent second sub-moving sleeve.

[0008] In conjunction with the above embodiments, in one implementation, the lower radial shaft moving sleeve base includes: a support portion and a transition portion fixedly connected to the support portion. The support portion is a hollow annular shape, the opening of the transition portion gradually decreases along the axial direction, the side of the transition portion is a smooth curved surface, and the end of the transition portion facing the lower radial shaft moving sleeve is provided with a keyway that matches the key block of the adjacent second sub-moving sleeve.

[0009] In one embodiment, in conjunction with the above embodiments, a water cap is provided at the end of the upper radial shaft moving sleeve pressure cap away from the upper radial shaft moving sleeve, and the water cap surrounds the portion of the drive shaft that extends out of the outer shell.

[0010] In one embodiment, in conjunction with the above embodiments, the lower radial shaft moving sleeve base is threadedly connected to the transmission shaft.

[0011] In one embodiment, in conjunction with the above embodiments, an upper radial shaft stationary sleeve is provided between the upper radial shaft moving sleeve and the outer shell, and a lower radial shaft stationary sleeve is provided between the lower radial shaft moving sleeve and the outer shell.

[0012] In one embodiment, in conjunction with the above embodiments, the outer surfaces of the upper radial shaft moving sleeve, the upper radial shaft stationary sleeve, the lower radial shaft moving sleeve, and the lower radial shaft stationary sleeve are all provided with a wear-resistant layer.

[0013] In one embodiment, in conjunction with the above embodiments, the outer shell is threadedly connected to the lower radial shaft stationary sleeve.

[0014] In one embodiment, in conjunction with the above embodiments, a tandem bearing is provided between the upper radial shaft moving sleeve and the lower radial shaft moving sleeve. The end of the tandem bearing cap facing the upper radial shaft moving sleeve is provided with a key block that matches the keyway of the adjacent first sub-moving sleeve, and the end of the tandem bearing facing the lower radial shaft moving sleeve is provided with a key block that matches the keyway of the adjacent second sub-moving sleeve.

[0015] In conjunction with the above embodiments, in one implementation, the multi-stage replaceable radial bearing drive shaft assembly further includes: a spacer, a half-ring, and a retainer disposed between the tandem bearing and the lower radial shaft moving sleeve, wherein the spacer, half-ring, and retainer are stacked sequentially along the axial direction.

[0016] The beneficial effects of the technical solutions provided in this application include: In this embodiment of the application, without changing the functions of the upper radial shaft moving sleeve and the lower radial shaft moving sleeve, the upper radial shaft moving sleeve is divided into multiple first sub-moving sleeves connected in series along the axial direction and interlocked with each other, and the lower radial shaft moving sleeve is divided into multiple second sub-moving sleeves connected in series along the axial direction and interlocked with each other. When a certain first sub-moving sleeve or second sub-moving sleeve is worn, its position is interchanged with the first sub-moving sleeve or the second sub-moving sleeve and reassembled together. This allows for more flexible adjustment and replacement of worn parts, extends the service life of the entire drive shaft assembly, reduces the production and maintenance costs of the drive shaft assembly, and fully utilizes the economic value of the screw drill bit. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a multi-stage replaceable radial bearing drive shaft provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the second moving sleeve; Figure 3 for Figure 2 A cross-sectional view along the AA direction; Figure 4This is a schematic diagram of the structure of the lower radial shaft moving sleeve base provided in the embodiments of this application; Figure 5 for Figure 4 A cross-sectional view along the AA direction; Figure 6 This is a schematic diagram showing the relationship between the wear-resistant layer lengths of the upper radial shaft moving sleeve and the upper radial shaft stationary sleeve. Figure 7 This is a schematic diagram showing the relationship between the lengths of the wear-resistant layers of the lower radial shaft moving sleeve and the lower radial shaft stationary sleeve.

[0019] In the diagram: 1. Drive shaft; 2. Lower radial shaft moving sleeve base; 21. Support part; 22. Transition part; 3. Lower radial shaft moving sleeve; 31. Second moving sleeve; 4. Lower radial shaft stationary sleeve; 5. Outer shell; 6. Spacer; 7. Half ring; 8. Stop sleeve; 9. String bearing; 10. Upper radial shaft moving sleeve; 11. Upper radial shaft stationary sleeve; 12. Upper radial shaft moving sleeve pressure cap; 13. Water cap; 14. Keyway; 15. Key block; 16. First wear-resistant layer; 17. Second wear-resistant layer; 18. Third wear-resistant layer; 19. Fourth wear-resistant layer. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0021] This application provides a multi-stage replaceable radial bearing drive shaft assembly, which can solve the technical problem that the upper and lower radial shaft moving sleeves are easily wasted during use in the prior art.

[0022] Figure 1 This is a schematic diagram of the structure of a multi-stage replaceable radial bearing drive shaft provided in an embodiment of this application. Figure 1As shown, this application embodiment provides a multi-stage replaceable radial bearing drive shaft assembly, including: a housing 5; a drive shaft 1, which is disposed inside the housing 5 and is coaxial with the housing 5; an upper radial shaft moving sleeve 10 located between the housing 5 and the drive shaft 1 and sleeved on the upper end of the drive shaft 1, the upper radial shaft moving sleeve 10 including a plurality of first sub-moving sleeves connected in series along the axial direction and interlocked with each other, each first sub-moving sleeve having a key block 15 at its top and a keyway 14 matching the key block 15 at its bottom; and a lower radial shaft moving sleeve 3 located between the housing 5 and the drive shaft 1 and sleeved on the lower end of the drive shaft 1, the lower radial shaft moving sleeve 3 including a plurality of second sub-moving sleeves 31 connected in series along the axial direction and interlocked with each other, each second sub-moving sleeve 31 having a key block 15 at its bottom and a keyway 14 matching the key block 15 at its top.

[0023] In practical applications, the upper radial shaft moving sleeve 10 and the lower radial shaft moving sleeve 3 work together to straighten the drive shaft 1, ensuring its stability during high-speed rotation and preventing it from wobbling or shifting, thus guaranteeing smooth power transmission to the drill bit of the screw drill. Since both the upper radial shaft moving sleeve 10 and the lower radial shaft moving sleeve 3 experience radial and lateral forces during application, the topmost first moving sleeve and the bottommost second moving sleeve 31 are prone to wear, while the first or second moving sleeve 31 closer to the middle is less susceptible to wear. When the topmost first moving sleeve and the bottommost second moving sleeve 31 become worn, they can be interchanged with the unworn first or second moving sleeve 31 closer to the middle and then reassembled. This extends the service life of the entire drive shaft assembly, reduces production and maintenance costs, and fully realizes the economic value of the screw drill.

[0024] Figure 2 This is a schematic diagram of the structure of the second moving sleeve. Figure 3 for Figure 2 Cross-sectional view along the AA direction. (Refer to reference) Figure 2 and Figure 3 Each second sub-moving sleeve 31 is a hollow annular structure. Four keyways 14 are circumferentially arranged at one end of the annulus, and four key blocks 15 corresponding to the positions of the four keyways 14 are circumferentially arranged at the other end of the annulus. Multiple second sub-moving sleeves 31 are engaged together via the keyways 14 and key blocks 15. When one second sub-moving sleeve wears out, it is swapped with a nearby, unworn second sub-moving sleeve 31, and then the multiple second sub-moving sleeves 31 are reassembled into a lower radial shaft moving sleeve 3. In some other embodiments of this application, the number of keyways 14 and key blocks 15 can be multiple, circumferentially distributed, and correspond one-to-one; this is not limited here.

[0025] In this embodiment of the application, the multi-stage replaceable radial bearing drive shaft assembly further includes: an upper radial shaft moving sleeve cap 12, which is sleeved on the drive shaft 1 and located at the top of the upper radial shaft moving sleeve 10, and has a keyway 14 at one end facing the upper radial shaft moving sleeve 10 that matches the key block 15 of the adjacent first sub-moving sleeve; and a lower radial shaft moving sleeve base 2, which is sleeved on the drive shaft 1 and located at the bottom of the lower radial shaft moving sleeve 3, and has a keyway 14 at one end facing the lower radial shaft moving sleeve 3 that matches the key block 15 of the adjacent second sub-moving sleeve 31.

[0026] Specifically, the upper radial shaft moving sleeve cap 12 is used to fix and press the upper radial shaft moving sleeve 10, ensuring the stable position of the upper radial shaft moving sleeve 10 on the transmission shaft 1. By providing a keyway 14 and a key block 15 on the upper radial shaft moving sleeve cap 12, the upper radial shaft moving sleeve cap 12 is engaged with the adjacent first moving sleeve, preventing relative movement between the upper radial shaft moving sleeve cap 12 and the adjacent first moving sleeve. The lower radial shaft moving sleeve base 2 is used to support and fix the lower radial shaft moving sleeve 3, ensuring the stability and reliability of the lower radial shaft moving sleeve 3. By providing a keyway 14 and a key block 15 on the lower radial shaft moving sleeve base 2, the lower radial shaft moving sleeve base 2 is engaged with the adjacent second moving sleeve 31, preventing relative movement between the lower radial shaft moving sleeve base 2 and the adjacent second moving sleeve 31.

[0027] Meanwhile, in this embodiment, the lower radial shaft moving sleeve base 2 is threadedly connected to the transmission shaft 1, and the lower radial shaft moving sleeve base 2 is sealed to the transmission shaft 1, thereby preventing impurities such as mud from entering the interior of the transmission shaft 1 and protecting the internal components of the transmission shaft 1.

[0028] Figure 4 This is a schematic diagram of the structure of the lower radial shaft moving sleeve base provided in an embodiment of this application. Figure 5 for Figure 4 A cross-sectional view along the AA direction. (Refer to reference.) Figure 4 and Figure 5 In this embodiment of the application, the lower radial shaft moving sleeve base 2 includes: a support part 21 and a transition part 22 fixedly connected to the support part 21. The support part 21 is a hollow ring shape, the opening of the transition part 22 gradually decreases along the axial direction, the side of the transition part 22 is a smooth curved surface, and the end of the transition part 22 facing the lower radial shaft moving sleeve 3 is provided with a keyway 14 that matches the key block 15 of the adjacent second sub-moving sleeve 31.

[0029] Specifically, the support part 21 provides the main support and fixing functions for the entire lower radial shaft moving sleeve base 2 and the lower radial shaft moving sleeve 3. The transition part 22 is used to reduce stress concentration, thereby improving the mechanical strength and durability of the lower radial shaft moving sleeve base 2. At the same time, the inner diameter of the minimum opening of the transition part 22 matches the outer diameter of the drive shaft 1, ensuring that the base can be tightly fitted onto the drive shaft 1.

[0030] In this embodiment of the application, a water cap 13 is provided at one end of the upper radial shaft moving sleeve cap 12 away from the upper radial shaft moving sleeve 10, and the water cap 13 surrounds the part of the transmission shaft 1 that extends out of the outer shell 5.

[0031] Specifically, the outer shell 5 serves as the outer shell of the entire drive shaft assembly. The water cap 13 works in conjunction with the outer shell 5 to seal and protect the drive shaft 1, preventing external impurities from entering the interior of the drive shaft assembly, thereby reducing wear and corrosion of the internal components of the drive shaft assembly and extending the service life of the entire drive shaft assembly.

[0032] In this embodiment of the application, an upper radial shaft stationary sleeve 11 is provided between the upper radial shaft moving sleeve 10 and the outer shell 5, and a lower radial shaft stationary sleeve 4 is provided between the lower radial shaft moving sleeve 3 and the outer shell 5.

[0033] Specifically, a certain gap is formed between the upper radial shaft stationary sleeve 11 and the upper radial shaft moving sleeve 10 to withstand the scouring of mud fluid, abrasive wear of sand particles, and lateral loads, while reducing wear between the upper radial shaft stationary sleeve 11 and the upper radial shaft moving sleeve 10, extending service life, and thus protecting the drive shaft 1. Similarly, the outer shell 5 is threadedly connected to the lower radial shaft stationary sleeve 4, and a certain gap is formed between the lower radial shaft stationary sleeve 4 and the lower radial shaft moving sleeve 3 to withstand the scouring of mud fluid, abrasive wear of sand particles, and lateral loads, while reducing wear between the lower radial shaft stationary sleeve 4 and the lower radial shaft moving sleeve 3, extending service life, and thus protecting the drive shaft 1. During drilling, the drill bit is subjected to large radial and axial forces. The upper radial shaft stationary sleeve 11 and the upper radial shaft moving sleeve 10 jointly bear the load on the upper end of the drive shaft 1, and the lower radial shaft stationary sleeve 4 and the lower radial shaft moving sleeve 3 jointly bear the load on the lower end of the drive shaft 1, preventing damage to the drive shaft 1 due to uneven force distribution.

[0034] Furthermore, the water cap 13, the upper radial shaft stationary sleeve 11, and the upper radial shaft moving sleeve 10 work together to straighten the drive shaft 1 and bear a certain load, while ensuring the sealing of the drive shaft assembly. Similarly, the lower radial shaft moving sleeve base 2, the lower radial shaft stationary sleeve 4, and the lower radial shaft moving sleeve 3 work together to ensure the stability of the lower end of the drive shaft 1.

[0035] In this embodiment, the outer surfaces of the upper radial shaft moving sleeve 10, the upper radial shaft stationary sleeve 11, the lower radial shaft moving sleeve 3, and the lower radial shaft stationary sleeve 4 are all provided with wear-resistant layers.

[0036] Figure 6 This is a schematic diagram showing the relationship between the wear-resistant layer lengths of the upper radial shaft moving sleeve 10 and the upper radial shaft stationary sleeve 11. Figure 7 This is a schematic diagram showing the relationship between the wear-resistant layer lengths of the lower radial shaft moving sleeve 3 and the lower radial shaft stationary sleeve 4.

[0037] Specifically, the outer surface of the upper radial shaft moving sleeve 10 is provided with a first wear-resistant layer 16, the outer surface of the upper radial shaft stationary sleeve 11 is provided with a second wear-resistant layer 17, the outer surface of the lower radial shaft moving sleeve 3 is provided with a third wear-resistant layer 18, and the outer surface of the lower radial shaft stationary sleeve 4 is provided with a fourth wear-resistant layer. The length of the second wear-resistant layer 17 in the axial direction is 1 / 2 to 2 / 3 of the length of the first wear-resistant layer 16 in the axial direction, and the length of the fourth wear-resistant layer in the axial direction is 1 / 2 to 2 / 3 of the length of the third wear-resistant layer 18 in the axial direction. Since the upper radial shaft moving sleeve 10 and the lower radial shaft moving sleeve 3 are in direct contact with the drive shaft 1 and bear high-speed rotation and lateral force during application, while the upper radial shaft stationary sleeve 11 and the lower radial shaft stationary sleeve 4 mainly bear the scouring of mud and the wear of sand particles during application, and their wear is relatively light, different wear-resistant layer lengths are set according to the different wear degrees of the stationary sleeve and the moving sleeve during application. On the one hand, wear-resistant materials can be allocated more rationally, reducing the manufacturing cost of the drive shaft assembly, and on the other hand, the wear resistance performance of key areas can be better guaranteed.

[0038] In this embodiment of the application, a tandem bearing 9 is provided between the upper radial shaft moving sleeve 10 and the lower radial shaft moving sleeve 3. The end of the tandem bearing 9 facing the upper radial shaft moving sleeve 10 is provided with a key block 15 that matches the keyway 14 of the adjacent first sub-moving sleeve, and the end of the tandem bearing 9 facing the lower radial shaft moving sleeve 3 is provided with a key block 15 that matches the keyway 14 of the adjacent second sub-moving sleeve 31.

[0039] Specifically, the tandem bearing 9 is used to bear radial and axial loads to ensure the stable operation of the drive shaft 1. At the same time, the tandem bearing 9 cooperates with the keyways 14 of the upper radial shaft sleeve 10 and the lower radial shaft sleeve 3 through the key block 15 to ensure the transmission of power.

[0040] In this embodiment of the application, the multi-stage replaceable radial bearing drive shaft assembly further includes: a spacer 6, a half ring 7 and a retainer 8 disposed between the tandem bearing 9 and the lower radial shaft moving sleeve 3, and the spacer 6, the half ring 7 and the retainer 8 are stacked sequentially along the axial direction.

[0041] The spacer 6 is used to adjust and maintain the spacing between components, ensuring the smooth operation of the drive shaft 1. The semi-ring 7 is used to position and fix the lower radial shaft moving sleeve 3, ensuring the accurate position of the lower radial shaft moving sleeve 3 within the drive shaft 1 housing. The retaining sleeve 8 serves to protect and isolate, preventing impurities such as mud from entering the drive shaft 1. The semi-ring 7 and spacer 6 work together to position and adjust the position and spacing between components, ensuring the precise fit and stable operation of the drive shaft assembly. The retaining sleeve 8 and the tandem bearing 9 work together to protect the drive shaft 1 and withstand various loads, ensuring the smooth operation of the drive shaft 1.

[0042] In this embodiment of the application, without changing the functions of the upper radial shaft moving sleeve and the lower radial shaft moving sleeve, the upper radial shaft moving sleeve is divided into multiple first sub-moving sleeves connected in series along the axial direction and interlocked with each other, and the lower radial shaft moving sleeve is divided into multiple second sub-moving sleeves connected in series along the axial direction and interlocked with each other. When a certain first sub-moving sleeve or second sub-moving sleeve is worn, its position is interchanged with the first sub-moving sleeve or the second sub-moving sleeve and reassembled together. This allows for more flexible adjustment and replacement of worn parts, extends the service life of the entire drive shaft assembly, reduces the production and maintenance costs of the drive shaft assembly, and fully utilizes the economic value of the screw drill bit.

[0043] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0044] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A multi-stage replaceable radial bearing drive shaft assembly, characterized in that, include: Outer shell (5); A drive shaft (1) is disposed inside the outer casing (5) and is coaxial with the outer casing (5); An upper radial shaft moving sleeve (10) is located between the outer shell (5) and the transmission shaft (1) and sleeved on the upper end of the transmission shaft (1). The upper radial shaft moving sleeve (10) includes a plurality of first sub-moving sleeves connected in series along the axial direction and interlocked with each other. Each first sub-moving sleeve has a key block (15) at its top and a key groove (14) matching the key block (15) at its bottom. A lower radial shaft moving sleeve (3) is located between the outer shell (5) and the transmission shaft (1) and sleeved on the lower end of the transmission shaft (1). The lower radial shaft moving sleeve (3) includes a plurality of second sub-moving sleeves (31) connected in series along the axial direction and interlocked with each other. Each second sub-moving sleeve (31) has a key block (15) at its bottom and a key groove (14) matching the key block (15) at its top.

2. The multi-stage replaceable radial bearing drive shaft assembly according to claim 1, characterized in that, The multi-stage replaceable radial bearing drive shaft assembly also includes: Upper radial shaft moving sleeve pressure cap (12), the upper radial shaft moving sleeve pressure cap (12) is sleeved on the transmission shaft (1) and located on the top of the upper radial shaft moving sleeve (10), the upper radial shaft moving sleeve pressure cap (12) is provided with a keyway (14) that matches the key block (15) of the adjacent first sub-moving sleeve at one end facing the upper radial shaft moving sleeve (10). The lower radial shaft moving sleeve base (2) is sleeved on the transmission shaft (1) and located at the bottom of the lower radial shaft moving sleeve (3). The lower radial shaft moving sleeve base (2) is provided with a keyway (14) that matches the key block (15) of the adjacent second sub-moving sleeve (31) at one end facing the lower radial shaft moving sleeve (3).

3. The multi-stage replaceable radial bearing drive shaft assembly according to claim 2, characterized in that, The lower radial shaft movable sleeve base (2) includes: The support part (21) and the transition part (22) fixedly connected to the support part (21) are hollow ring-shaped. The opening of the transition part (22) gradually decreases along the axial direction. The side of the transition part (22) is a smooth curved surface. The end of the transition part (22) facing the lower radial shaft moving sleeve (3) is provided with a keyway (14) that matches the key block (15) of the adjacent second sub-moving sleeve (31).

4. The multi-stage replaceable radial bearing drive shaft assembly according to claim 2, characterized in that, A water cap (13) is provided at one end of the upper radial shaft moving sleeve pressure cap (12) away from the upper radial shaft moving sleeve (10), and the water cap (13) surrounds the part of the transmission shaft (1) that extends out of the outer shell (5).

5. The multi-stage replaceable radial bearing drive shaft assembly according to claim 2, characterized in that, The lower radial shaft moving sleeve base (2) is threadedly connected to the transmission shaft (1).

6. The multi-stage replaceable radial bearing drive shaft assembly according to claim 1, characterized in that, An upper radial shaft stationary sleeve (11) is provided between the upper radial shaft moving sleeve (10) and the outer shell (5), and a lower radial shaft stationary sleeve (4) is provided between the lower radial shaft moving sleeve (3) and the outer shell (5).

7. The multi-stage replaceable radial bearing drive shaft assembly according to claim 6, characterized in that, The outer surfaces of the upper radial shaft moving sleeve (10), the upper radial shaft stationary sleeve (11), the lower radial shaft moving sleeve (3), and the lower radial shaft stationary sleeve (4) are all provided with wear-resistant layers.

8. The multi-stage replaceable radial bearing drive shaft assembly according to claim 6, characterized in that, The outer casing (5) is threadedly connected to the lower radial shaft stationary sleeve (4).

9. The multi-stage replaceable radial bearing drive shaft assembly according to claim 1, characterized in that, A tandem bearing (9) is provided between the upper radial shaft moving sleeve (10) and the lower radial shaft moving sleeve (3). The end of the tandem bearing (9) facing the upper radial shaft moving sleeve (10) is provided with a key block (15) that matches the keyway (14) of the adjacent first sub-moving sleeve. The end of the tandem bearing (9) facing the lower radial shaft moving sleeve (3) is provided with a key block (15) that matches the keyway (14) of the adjacent second sub-moving sleeve (31).

10. The multi-stage replaceable radial bearing drive shaft assembly according to claim 9, characterized in that, The multi-stage replaceable radial bearing drive shaft assembly also includes: The spacer (6), half ring (7) and retainer (8) are disposed between the tandem bearing (9) and the lower radial shaft moving sleeve (3), and the spacer (6), half ring (7) and retainer (8) are stacked sequentially along the axial direction.

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