Transmission shaft correcting device

Abstract

The invention discloses a transmission shaft correcting device, and relates to the technical field of mechanical assembly, the transmission shaft correcting device comprises a supporting seat and an adjusting nut, the first end of the supporting seat is used for being detachably and fixedly connected with a coupler shell, the second end of the supporting seat is provided with a mounting hole, and the first end of the adjusting nut is rotatably mounted in the mounting hole; the adjusting nut is coaxial with the transmission shaft; a limiting shaft shoulder is arranged on the outer wall of the adjusting nut, the limiting shaft shoulder is used for limiting the adjusting nut to axially move towards the first end of the supporting seat, and an internal thread of the adjusting nut is used for being screwed with an external thread at the shaft end of the transmission shaft. The transmission shaft can be axially pulled through the adjusting nut, axial position adjustment of the transmission shaft is achieved, the adjusting nut and the transmission shaft are kept coaxial through cooperation of the adjusting nut and the mounting hole in the second end of the supporting seat, and therefore it is guaranteed that the axis of the transmission shaft cannot deviate in the process of axially pulling the transmission shaft.

Description

Technical Field

[0001] This invention relates to the field of mechanical assembly technology, and in particular to a transmission shaft alignment device. Background Technology

[0002] In tobacco packaging equipment, flexible couplings are commonly used drive shaft connectors. The drive shaft is usually connected to the coupling via a spline or flat key. The coupling is usually located inside the coupling housing, with the drive shaft end extending out of the housing. This shaft end is equipped with a keyway for connecting to pulleys, gears, etc.

[0003] During the assembly process, the drive shaft is often subjected to axial force, which causes the drive shaft to axially displace, resulting in the keyway at the end of the drive shaft being partially or completely retracted into the housing, making it impossible for the drive key to be properly installed in the keyway.

[0004] To address this issue, the current main method involves operators using tools such as pry bars and long-handled screwdrivers to forcibly pry the end of the drive shaft through process holes or gaps in the housing, causing it to move axially and return to the predetermined axial position for subsequent installation. Regardless of the tool used for axial prying, this will cause varying degrees of shaft misalignment. After installation, internal stress cannot be eliminated, resulting in excessive vibration during operation and significantly shortening the lifespan of components such as flexible couplings and bearings. Furthermore, this operation requires pry bars inserted through process holes in the housing, limiting operating space. Additionally, one person must hold the drive shaft in its predetermined position while another person locks it in place, thus requiring two people to complete the operation. Summary of the Invention

[0005] This invention provides a drive shaft correction device, which aims to solve the technical problem that the drive shaft axial displacement correction axis is prone to misalignment and is inconvenient to operate.

[0006] To achieve the above objectives, the present invention provides a drive shaft alignment device, including a support base and an adjusting nut. The first end of the support base is detachably fixed to a coupling housing, and the second end of the support base is provided with a mounting hole. The first end of the adjusting nut is rotatably mounted in the mounting hole.

[0007] The adjusting nut is coaxial with the drive shaft; the outer wall of the adjusting nut is provided with a limiting shoulder, which is used to restrict the adjusting nut from axially moving toward the first end of the support seat, and the internal thread of the adjusting nut is used to engage with the external thread of the shaft end of the drive shaft.

[0008] The adjusting nut is threaded to the end of the drive shaft. The drive shaft can be pulled axially by adjusting the nut to adjust its axial position. The adjusting nut is engaged with the mounting hole at the second end of the support to keep the adjusting nut and the drive shaft coaxial. This ensures that the axis of the drive shaft will not be offset during the axial pulling of the drive shaft, ensuring the assembly accuracy of the drive shaft and avoiding the generation of internal stress during installation.

[0009] In addition, with this invention, once the drive shaft is adjusted to the correct position, it will remain in that position without retracting due to the self-locking of the thread. Therefore, a single person can complete the calibration work, and the operating space is not limited, making it convenient to operate.

[0010] Preferably, a support bearing is provided between the mounting hole and the adjusting nut, the outer wall of the outer ring of the support bearing mates with the inner wall of the mounting hole, and the first end face of the outer ring of the support bearing abuts against the bottom of the mounting hole;

[0011] The outer wall of the first end of the adjusting nut is provided with a positioning cylindrical surface, and the inner wall of the inner ring of the support bearing is engaged with the positioning cylindrical surface;

[0012] The limiting shoulder abuts against the second end face of the inner ring of the supporting bearing.

[0013] By installing a support bearing between the mounting hole and the adjusting nut, the operating resistance is significantly reduced, making the calibration operation more effortless. Moreover, as a standard component, the support bearing can better ensure the coaxiality of the adjusting nut and the drive shaft.

[0014] Preferably, the support bearing is a tapered roller bearing.

[0015] Tapered roller bearings have the characteristic of being able to withstand both radial and axial loads simultaneously. During the calibration process, tapered roller bearings can withstand both the radial force generated when the adjusting nut rotates and the large axial force generated when the drive shaft is pulled, resulting in a stronger structural load-bearing capacity.

[0016] Preferably, the outer wall of the second end of the adjusting nut is provided with an external hexagonal surface, and the limiting shoulder is located between the positioning cylindrical surface and the external hexagonal surface.

[0017] The second end of the adjusting nut has an external hexagonal face, providing a standardized force application interface. Operators can rotate the adjusting nut using a regular wrench, making it easy to operate.

[0018] Preferably, the first end of the adjusting nut is provided with a first positioning hole, the first positioning hole is coaxial with the mounting hole, and the inner wall of the first positioning hole is used to make clearance fit with the outer wall of the drive shaft to radially limit the drive shaft.

[0019] The first end of the adjusting nut is provided with a first positioning hole, the inner wall of which is clearance-fitted with the outer wall of the drive shaft. During the calibration process, it plays a radial limiting and guiding role for the drive shaft, further ensuring the coaxiality of the adjusting nut and the drive shaft.

[0020] Preferably, the internal thread is located at the second end of the adjusting nut, and the diameter of the first positioning hole is larger than the major diameter of the internal thread, so that the second end of the first positioning hole forms a positioning stepped surface. The positioning stepped surface is used to cooperate with the stepped surface on the drive shaft to axially position the drive shaft.

[0021] The positioning stepped surface mates with the stepped surface on the drive shaft, forming an axial limit when the drive shaft is adjusted to the predetermined position. This provides the operator with a clear indication of the position, preventing over-screwing or under-screwing and ensuring precise control of the correction displacement.

[0022] Preferably, the support base includes a first ring, a second ring, and a plurality of connecting rods. The first ring is located at a first end of the support base, and the second ring is located at a second end of the support base. The first ring and the second ring are coaxial. The first end of each connecting rod is fixedly connected to the first ring, and the second end is fixedly connected to the second ring. All the connecting rods are evenly distributed around the axis of the first ring.

[0023] The support base adopts a hollow structure composed of a first ring, a second ring, and a connecting rod. While ensuring the overall structural rigidity, it significantly reduces the weight of the device, making it easier for operators to handle and install. At the same time, it makes it easier for operators to observe the position of the drive shaft.

[0024] Preferably, the first ring is provided with a plurality of flange holes, which are used to fix the support base to the coupling housing.

[0025] The first ring is provided with flange holes, which can be used to achieve quick and detachable connection between the support base and the coupling housing through fasteners. The installation and disassembly are convenient. The flange connection has a strong load-bearing capacity and can reliably withstand the axial tensile force generated during the calibration process. At the same time, the connection has high rigidity, which reduces deformation and displacement during the calibration process and ensures calibration accuracy.

[0026] Preferably, the first ring has a wrench clearance groove, which allows a wrench to be inserted into the support seat to tighten the locking bolts on the coupling housing.

[0027] The wrench clearance groove provides space for the wrench to extend, allowing the operator to directly use the wrench to tighten the locking bolts on the coupling housing after calibration and before removing the device, thus axially locking the adjusted drive shaft and preventing possible positional changes when the calibration device is removed first and the bolts are tightened.

[0028] Preferably, the first end of the support base is provided with a second positioning hole, the second positioning hole is coaxial with the mounting hole, and the inner wall of the second positioning hole is used to cooperate with the outer wall of the positioning boss on the coupling housing to radially position the support base.

[0029] The first end of the support base is provided with a second positioning hole, which cooperates with the outer wall of the positioning boss on the coupling housing to achieve rapid and accurate radial positioning when installing the support base, ensuring the coaxiality of the support base and the drive shaft, and guaranteeing the coaxiality of the adjusting nut and the drive shaft during subsequent calibration. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the assembly structure of the drive shaft;

[0032] Figure 2 This is a perspective view of the present invention;

[0033] Figure 3 This is a three-dimensional sectional view of the present invention;

[0034] Figure 4 This is the front view of the support base;

[0035] Figure 5 This is the front sectional view of the support base;

[0036] Figure 6 This is the right view of the support base;

[0037] Figure 7 A three-dimensional view of the support base;

[0038] Figure 8 A 3D view of the adjusting nut;

[0039] Figure 9 A partial sectional front view of the adjusting nut;

[0040] Figure 10 This is a front sectional view of the present invention during use;

[0041] Figure 11 This is a perspective view of the invention in use;

[0042] Figure 12 This is a perspective view of the drive shaft and coupling housing.

[0043] Explanation of reference numerals in the attached figures:

[0044] Support base 1, adjusting nut 2, mounting hole 3, limiting shoulder 4, support bearing 5, positioning cylindrical surface 6, external hexagonal surface 7, first positioning hole 8, positioning stepped surface 9, first ring 10, second ring 11, connecting rod 12, flange hole 13, wrench clearance groove 14, second positioning hole 15, drive shaft 16, flexible coupling 17, spline shaft 18, coupling housing 19, equipment body 20, shaft cover 21, pulley 22, rolling bearing 23, positioning boss 24, locking bolt 25, deformation groove 26. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] refer to Figure 1 The assembly structure of drive shaft 16 is roughly as follows:

[0047] The first end of the drive shaft 16 is connected to the spline shaft 18 via a flexible coupling 17. The drive shaft 16 drives the spline shaft 18 to rotate via the flexible coupling 17. A coupling housing 19 is provided outside the flexible coupling 17. The first end of the coupling housing 19 is connected to the equipment body 20 by bolts or screws, and the second end is connected to a shaft cover 21. The drive shaft 16 is connected to the coupling housing 19 and the shaft cover 21 via a rolling bearing 23. The second end of the drive shaft 16 extends out of the shaft cover 21 for connection with power input mechanisms such as pulleys 22 via a key.

[0048] The assembly sequence of the above assembly structure is roughly as follows:

[0049] First, the rolling bearing 23 is installed on the drive shaft 16. Then, the drive shaft 16 and the spline shaft 18 are connected through the flexible coupling 17. Next, the coupling housing 19 is fitted over the flexible coupling 17 and fixedly connected to the equipment body 20. After the coupling housing 19 is installed in place, the rolling bearing 23 mates with the bearing hole on the coupling housing 19. Then, another rolling bearing 23 is installed into the bearing hole on the shaft cover 21. The shaft cover 21 is then inserted onto the drive shaft 16 and fixedly connected to the coupling housing 19. After the shaft cover 21 is installed in place, the drive shaft 16 passes through the rolling bearing 23 inside the shaft cover 21.

[0050] During the assembly process described above, when installing the coupling housing 19, the friction between the rolling bearing 23 and the coupling housing 19 will cause the drive shaft 16 to be subjected to axial force and move towards the first end of the drive shaft 16. As a result, after the shaft cover 21 is installed, the keyway portion or all of the second end of the drive shaft 16 will be retracted into the shaft cover 21, making it impossible to install the pulley 22, etc.

[0051] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] refer to Figure 2 , Figure 3 , Figure 10 and Figure 11 In some embodiments, the drive shaft alignment device includes a support base 1 and an adjusting nut 2. The first end of the support base 1 is used to be detachably fixed to the coupling housing 19. For example, the detachable fixed connection between the first end of the support base 1 and the coupling housing 19 is made by bolts. The first end of the support base 1 is provided with a flange, and the flange is provided with a plurality of flange holes 13. The support base 1 is fixed to the end face of the coupling housing 19 by bolts. This connection method is stable and reliable and easy to disassemble and assemble.

[0053] The second end of the support base 1 is provided with a mounting hole 3. After the support base 1 is fixedly connected to the coupling housing 19, the mounting hole 3 is coaxial with the drive shaft 16. The first end of the adjusting nut 2 is rotatably installed in the mounting hole 3, and the adjusting nut 2 is coaxial with the mounting hole 3, so that the adjusting nut 2 is coaxial with the drive shaft 16. The outer wall of the adjusting nut 2 is provided with a limiting shoulder 4, which contacts the end face of the second end of the support base 1, so that the adjusting nut 2 cannot move axially toward the first end of the support base 1.

[0054] The internal thread of the adjusting nut 2 engages with the external thread at the shaft end of the drive shaft 16. When the adjusting nut 2 is rotated, under the action of the thread, the adjusting nut 2 will apply an axial force toward the second end of the drive shaft 16, thereby causing the drive shaft 16 to move toward the second end to adjust the axial position of the drive shaft 16.

[0055] refer to Figure 2 and Figure 3 Preferably, a support bearing 5 is provided between the mounting hole 3 and the adjusting nut 2. The outer wall of the outer ring of the support bearing 5 is fitted with the inner wall of the mounting hole 3, and the first end face of the outer ring of the support bearing 5 abuts against the bottom of the mounting hole 3. The first end outer wall of the adjusting nut 2 is provided with a positioning cylindrical surface 6, and the inner wall of the inner ring of the support bearing 5 is fitted with the positioning cylindrical surface 6. The limiting shoulder 4 abuts against the second end face of the inner ring of the support bearing 5.

[0056] By providing a support bearing 5, the rotational motion of the adjusting nut 2 is converted into rolling friction, significantly reducing operating resistance. Exemplarily, the support bearing 5 can be a deep groove ball bearing, an angular contact ball bearing, or a tapered roller bearing. Preferably, the support bearing 5 is a tapered roller bearing, which can simultaneously withstand large radial and axial loads to limit the axial movement of the adjusting nut 2 toward the first end of the support seat 1.

[0057] More preferably, the outer ring of the support bearing 5 and the inner wall of the mounting hole 3 are clearance fits, and the inner ring of the support bearing 5 and the positioning cylindrical surface 6 of the adjusting nut 2 are also clearance fits, which facilitates the disassembly of the support bearing 5 from the support seat 1 and the adjusting nut 2, and makes it easier to store and preserve. It should be noted that the cumulative tolerance of the clearance fits is within the allowable tolerance range of the coaxiality of the adjusting nut 2 and the drive shaft 16.

[0058] As a low-cost alternative, in some embodiments, the support bearing 5 may not be provided between the adjusting nut 2 and the mounting hole 3, and the positioning cylindrical surface 6 of the adjusting nut 2 may directly engage with the inner wall of the mounting hole 3 with a clearance fit. Preferably, a sliding bushing may be provided between the outer wall of the adjusting nut 2 and the mounting hole 3 to reduce friction.

[0059] refer to Figure 8 and Figure 9 In some embodiments, the outer wall of the second end of the adjusting nut 2 is provided with an external hexagonal surface 7, and the limiting shoulder 4 is located between the positioning cylindrical surface 6 and the external hexagonal surface 7. The external hexagonal surface 7 serves as a force-applying structure, making it convenient for operators to rotate the adjusting nut 2 using a common wrench. As an equivalent alternative to the external hexagonal surface 7, in some embodiments, the second end of the adjusting nut 2 may also be provided with an internal hexagonal hole, a Torx hole, a handle, or a handwheel, etc.

[0060] refer to Figure 9 and Figure 10 In some embodiments, the first end of the adjusting nut 2 is provided with a first positioning hole 8, which is coaxial with the mounting hole 3. The first positioning hole 8 is a smooth cylindrical hole, and the inner wall of the first positioning hole 8 is clearance-fitted with the outer wall of the drive shaft 16. This provides additional radial restraint on the drive shaft 16 based on the threaded engagement, ensuring the coaxiality of the drive shaft 16 and the adjusting nut 2, thereby ensuring smooth engagement of the internal and external threads and avoiding thread seizing or damage due to axial deviation. Optionally, the inner wall of the first positioning hole 8 may be provided with a lubricating oil groove or sprayed with anti-friction material to reduce friction.

[0061] In some embodiments, the internal thread is located at the second end of the adjusting nut 2, and the diameter of the first positioning hole 8 is larger than the major diameter of the internal thread, so that the second end of the first positioning hole 8 forms a positioning stepped surface 9. The positioning stepped surface 9 is used to mate with the stepped surface on the drive shaft 16 to axially position the drive shaft 16. When the adjusting nut 2 is screwed into the drive shaft 16, as the engagement length increases, the drive shaft 16 is gradually pulled towards the second end, and the stepped surface on the drive shaft 16 gradually approaches the positioning stepped surface 9. When the two contact, the operator will receive a clear indication of the position, preventing over-screwing or under-screwing, and achieving precise control of the axial displacement of the drive shaft 16. In some embodiments, the positioning stepped surface 9 may not contact directly, but may be cushioned by a gasket or elastic element.

[0062] refer to Figures 4 to 7 In some embodiments, the support base 1 includes a first ring 10, a second ring 11, and several connecting rods 12. The first ring 10 is located at the first end of the support base 1, and the second ring 11 is located at the second end of the support base 1. The first ring 10 and the second ring 11 are coaxial. The first end of each connecting rod 12 is fixedly connected to the first ring 10, and the second end is fixedly connected to the second ring 11. All connecting rods 12 are evenly distributed around the axis of the first ring 10. The mounting hole 3 is opened on the inner wall of the second ring 11. This side-hollow structure of the support base 1 significantly reduces the weight of the device while ensuring overall rigidity, making it easier for operators to handle and install. At the same time, it is convenient for operators to observe the adjustment status of the transmission shaft 16 through the hollow part. For example, the connecting rods 12 can be cylindrical rods, square rods, or rods with reinforcing ribs. The number of them can be three, four, or more. The connection between the connecting rods 12 and the rings can be achieved by welding, threaded connection, or integral casting. Preferably, the diameter of the first ring 10 is larger than the diameter of the second ring 11. The support base 1 is generally frustum-shaped, and the connecting rod 12 is arranged along the generatrix of the frustum. The larger diameter of the first ring 10 is to be adapted to the coupling housing 19. The smaller diameter of the second ring 11 can reduce the overall volume and weight of the support base 1 while meeting the installation requirements of the support bearing 5 and the adjusting nut 2.

[0063] refer to Figure 7 , Figure 10 and Figure 11In some embodiments, the first ring 10 is provided with a plurality of flange holes 13, which are used to fix the support base 1 to the coupling housing 19. The flange holes 13 can be smooth holes or threaded holes, and are connected to the corresponding threaded holes on the coupling housing 19 by bolts or screws. This flange connection method has strong load-bearing capacity and high connection rigidity, and can reliably withstand the axial tensile force generated during the calibration process. Preferably, the flange holes 13 can be oblong holes, with the length direction of the oblong holes set along the circumference of the first ring 10, so as to allow for fine adjustment during installation and avoid the inability to install due to slight misalignment between the flange holes 13 and the threaded holes on the coupling housing 19 caused by positional errors.

[0064] refer to Figure 2 , Figure 5 and Figure 10 In some embodiments, the first end of the support base 1 is provided with a second positioning hole 15. Correspondingly, the coupling housing 19 has a positioning boss 24. The positioning boss 24 is an existing structure on the coupling housing 19, used to position the shaft cover 21 when it is installed. The inner wall of the second positioning hole 15 cooperates with the outer wall of the positioning boss 24 on the coupling housing 19 to radially position the support base 1. For example, the second positioning hole 15 is a cylindrical hole opened on the first ring 10 and coaxial with the first ring 10. When installing the support base 1, the second positioning hole 15 is first fitted onto the positioning boss 24 to achieve fast and accurate radial positioning, ensuring the coaxiality of the support base 1 and the drive shaft 16. Then, the support base 1 is rotated so that the flange hole 13 on the support base 1 is aligned with the screw hole on the coupling housing 19. Finally, the connection between the support base 1 and the coupling housing 19 is completed by tightening with bolts or screws.

[0065] Alternatively, in some embodiments, a plurality of circumferentially distributed positioning protrusions may be provided on the end face of the first ring 10, and correspondingly, positioning grooves may be provided on the coupling housing 19. Alternatively, a plurality of circumferentially distributed positioning grooves may be provided on the end face of the first ring 10, and corresponding positioning protrusions may be provided on the coupling housing 19. The positioning of the support seat 1 is achieved by the positioning protrusions being embedded one-to-one into the positioning grooves.

[0066] refer to Figure 7 and Figure 11 In some embodiments, the first ring 10 has a wrench clearance groove 14. The position of the wrench clearance groove 14 in the axial direction of the support 1 corresponds to the position of the locking bolt 25 on the coupling housing 19. When installing the support 1, it is also necessary to ensure that the radial position of the wrench clearance groove 14 corresponds to the position of the locking bolt 25. After the drive shaft 16 is adjusted to the correct position, the operator does not need to remove the calibration device. He can directly use a wrench to reach through the clearance groove and tighten the original locking bolt 25 to lock the axial position of the drive shaft 16.

[0067] It should be noted that the locking of the drive shaft 16 by the locking bolt 25 is an existing structure on the coupling housing 19, which will be briefly explained here. (Reference) Figure 12 The coupling housing 19 has a deformation groove 26. The locking bolt 25 passes through the deformation groove 26 perpendicular to the axial direction of the drive shaft 16. During the tightening of the locking bolt 25, the corresponding part of the coupling housing 19 undergoes elastic deformation. The coupling housing 19 grips the rolling bearing 23 on the drive shaft 16, locking the axial position of the rolling bearing 23, and thus locking the axial position of the drive shaft 16.

[0068] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0069] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A drive shaft alignment device, characterized in that, Includes a support base (1) and an adjusting nut (2). The first end of the support base (1) is used to be detachably fixedly connected to the coupling housing (19). The second end of the support base (1) is provided with a mounting hole (3). The first end of the adjusting nut (2) is rotatably installed in the mounting hole (3). The adjusting nut (2) is coaxial with the transmission shaft (16); the outer wall of the adjusting nut (2) is provided with a limiting shoulder (4), the limiting shoulder (4) is used to restrict the adjusting nut (2) from moving axially toward the first end of the support seat (1), and the internal thread of the adjusting nut (2) is used to engage with the external thread of the shaft end of the transmission shaft (16).

2. The transmission shaft alignment device according to claim 1, characterized in that, A support bearing (5) is provided between the mounting hole (3) and the adjusting nut (2). The outer wall of the outer ring of the support bearing (5) is fitted with the inner wall of the mounting hole (3). The first end face of the outer ring of the support bearing (5) abuts against the bottom of the mounting hole (3). The first end of the adjusting nut (2) has a positioning cylindrical surface (6) on its outer wall, and the inner wall of the inner ring of the support bearing (5) is in contact with the positioning cylindrical surface (6). The limiting shoulder (4) abuts against the second end face of the inner ring of the supporting bearing (5).

3. The transmission shaft alignment device according to claim 2, characterized in that, The support bearing (5) is a tapered roller bearing.

4. The transmission shaft alignment device according to claim 2 or 3, characterized in that, The second end of the adjusting nut (2) has an outer hexagonal surface (7) on its outer wall, and the limiting shoulder (4) is located between the positioning cylindrical surface (6) and the outer hexagonal surface (7).

5. The transmission shaft alignment device according to claim 4, characterized in that, The first end of the adjusting nut (2) is provided with a first positioning hole (8), which is coaxial with the mounting hole (3). The inner wall of the first positioning hole (8) is used to make clearance fit with the outer wall of the transmission shaft (16) to radially limit the transmission shaft (16).

6. The transmission shaft alignment device according to claim 5, characterized in that, The internal thread is located at the second end of the adjusting nut (2). The diameter of the first positioning hole (8) is larger than the major diameter of the internal thread, so that the second end of the first positioning hole (8) forms a positioning stepped surface (9). The positioning stepped surface (9) is used to cooperate with the stepped surface on the drive shaft (16) to axially position the drive shaft (16).

7. The transmission shaft alignment device according to claim 1, characterized in that, The support base (1) includes a first ring (10), a second ring (11) and a plurality of connecting rods (12). The first ring (10) is located at the first end of the support base (1), and the second ring (11) is located at the second end of the support base (1). The first ring (10) and the second ring (11) are coaxial. The first end of each connecting rod (12) is fixedly connected to the first ring (10), and the second end is fixedly connected to the second ring (11). All the connecting rods (12) are evenly distributed around the axis of the first ring (10).

8. The transmission shaft alignment device according to claim 7, characterized in that, The first ring (10) is provided with a plurality of flange holes (13), which are used to fix the support (1) to the coupling housing (19).

9. The transmission shaft alignment device according to claim 7, characterized in that, The first ring (10) has a wrench clearance groove (14) for the wrench to be inserted into the support seat (1) to tighten the locking bolt (25) on the coupling housing (19).

10. The transmission shaft alignment device according to claim 1, characterized in that, The first end of the support base (1) is provided with a second positioning hole (15). The second positioning hole (15) is coaxial with the mounting hole (3). The inner wall of the second positioning hole (15) is used to cooperate with the outer wall of the positioning boss (24) on the coupling housing (19) to radially position the support base (1).

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