CN220362223U - Centering device - Google Patents

Abstract

The application provides a centering device belongs to rotor assembly technical field for solve the problem that sectional type combined shaft rotor assembly degree of difficulty is big, with high costs. The centering device of this application includes: sleeve, fixed subassembly and adjusting part. The sleeve includes a first end and a second end. The first end is used for sleeving the end part of the first shaft section. The second end is used for inserting a second shaft section connected with the first shaft section. The fixed component is arranged at the first end of the sleeve. The fixed subassembly is used for with sleeve and first axle segment fixed connection. The adjusting component is arranged at the second end of the sleeve. The adjusting component is used for adjusting coaxiality between the second shaft section and the first shaft section. The device simplifies the centering work of the sectional type combined shaft rotor and improves the assembly precision and the assembly efficiency of the sectional type combined shaft rotor.

Description

Centering device

Technical Field

The application belongs to the technical field of rotor assembly, and particularly relates to a centering device.

Background

Rotors in large rotating machinery are important components that determine the smooth operation of the equipment in thermal, nuclear, and other industrial fields. The shape and position precision of the rotor can directly influence the running stability of the equipment, and low shape and position precision can lead to the consequences of equipment vibration, bearing eccentric wear, even rotor and stator rubbing and the like. In some devices, the main shaft of the rotor is not a complete structure, but is assembled from multiple sections of shafts to form a main shaft, i.e., a segmented composite shaft rotor, due to structural constraints or special performance requirements. The form and position tolerance precision of a main shaft can be ensured by the machining precision of mechanical equipment, and the machining precision of a single-piece shaft cannot completely ensure the integral form and position precision of the rotor aiming at the segmented combined shaft rotor, because the assembly precision among shaft sections can have a great influence on the centering precision of the integral rotor, and further the form and position precision of the rotor is influenced. Thus, the level of assembly of the segmented composite rotor determines the accuracy of the rotor shape and position.

In the prior art, the shape and position accuracy of the whole segmented combined shaft rotor is generally guaranteed through designing a process spigot. As shown in fig. 1, in order to ensure centering accuracy between the fixed shaft section 1 and the connecting shaft section 2, a process spigot 3 is designed on the connecting shaft section 2. When the fixed shaft section 1 is in butt joint with the connecting shaft section 2, the centering precision of the two sections of shafts is ensured by means of the plug-in connection end of the fixed shaft section 1 and the process spigot 3, and then the fixed shaft section 1 is fixedly connected with the connecting shaft section 2 through the connecting screw 4. Therefore, the accuracy thereof depends on the machining accuracy and the assembly accuracy of the process spigot 3. The process spigot 3 has small fit clearance, so that the centering accuracy is relatively high, the process spigot 3 has large fit clearance, the centering accuracy is lower, but the fit clearance is too small, and the assembly difficulty is greatly increased. Moreover, since the process spigot 3 is reserved on the connecting shaft section 2, the diameter of the forging blank of the connecting shaft section 2 is increased, the size and weight of the forging blank are increased, the cost of raw materials is increased, and the part of the connecting shaft section 2 with the increased diameter for reserving the process spigot 3 is not a product structure, and the part needs to be machined and removed after the assembly and the positioning of the two sections of shafts are completed, so that the machining cost is increased. Meanwhile, the alignment precision of the main shaft is ensured by the cooperation of the process spigot 3 and the fixed shaft section 1, and the main shaft is not adjustable after the installation is finished. In addition, the smaller the fit clearance, the more shaft sections, the larger the accumulated error of the fit by the process spigot 3. Moreover, for some shafts with large weight, the shafts cannot be moved and adjusted by manpower, and the centering work is very difficult.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art or related technologies, and provides a centering device.

The centering device of this application includes: sleeve, fixed subassembly and adjusting part. The sleeve includes a first end and a second end. The first end is used for sleeving the end part of the first shaft section. The second end is used for inserting a second shaft section connected with the first shaft section. The fixed component is arranged at the first end of the sleeve. The fixed subassembly is used for with sleeve and first axle segment fixed connection. The adjusting component is arranged at the second end of the sleeve. The adjusting component is used for adjusting coaxiality between the second shaft section and the first shaft section. Wherein, fixed subassembly includes: a plurality of fixed screw holes and a plurality of fixing bolts. A plurality of fixed screw holes are positioned on the wall of the first end of the sleeve. The plurality of fixing threaded holes are uniformly distributed along the circumference of the sleeve. Each fixing bolt is positioned in one fixing threaded hole. One end of the fixing bolt can extend into the sleeve and is abutted against the side face of the first shaft section. The adjusting assembly includes: a plurality of adjusting threaded holes and a plurality of adjusting bolts. A plurality of adjustment threaded holes are located on the wall of the second end of the sleeve. The plurality of adjusting threaded holes are uniformly distributed along the circumference of the sleeve. Each adjusting bolt is positioned in one adjusting threaded hole. One end of the adjusting bolt can extend into the sleeve and is abutted against the side face of the second shaft section. By turning the adjusting bolt, the position of the second shaft section in the sleeve can be shifted.

Optionally, the sleeve comprises: a first ring plate and a second ring plate. The first annular plate and the second annular plate are arc-shaped. The first annular plate and the second annular plate are buckled with each other and are connected through a connecting piece.

Optionally, the first ring plate and the second ring plate are both arc-shaped and the first ring plate is coaxial with the second ring plate.

Optionally, the sleeve further comprises: a pair of first connection plates and a pair of second connection plates. The first connecting plates are respectively arranged on two sides of the first annular plate. The pair of second connecting plates are respectively arranged at two sides of the second annular plate. The first connecting plates and the second connecting plates are in one-to-one correspondence and are mutually attached. The connecting piece is connected between the first connecting plate and the second connecting plate on the same side.

Optionally, the adjustment assembly further comprises a plurality of lock nuts. Each lock nut is arranged on one adjusting bolt and is positioned on the outer side of the sleeve.

Advantageous effects

The centering device provided by the utility model can effectively control the centering of each section of shaft in the rotor, simplify the centering work of the segmented combined shaft rotor and improve the assembly precision and the assembly efficiency of the segmented combined shaft rotor. And the process spigot is not required to be designed at the end part of the shaft section, so that the blanking size of the main shaft is reduced, the cost of raw materials is reduced, the process is simplified, unnecessary processing procedures are reduced, the manufacturing cost is further reduced, and the manufacturing time is shortened. The centering device provided by the utility model effectively reduces the difficulty of centering operation, has no specific shape and position requirements on the placement direction of the shaft section (can be used in transverse placement or vertical placement), and can be suitable for centering adjustment of two sections of shafts in any shape and position.

Drawings

FIG. 1 is a schematic diagram of a centering method in the prior art;

FIG. 2 is a schematic view of a radial cross-sectional structure of a centering device according to one embodiment of the present application;

FIG. 3 is an axial structural schematic view of a centering device according to one embodiment provided herein;

FIG. 4 is a flow chart of a centering method of one embodiment provided herein;

FIG. 5 is a flow chart of a centering method of one embodiment provided herein;

FIG. 6 is a flow chart of a centering method according to one embodiment provided herein.

The reference numerals are expressed as:

1. a stationary shaft section; 2. a connecting shaft section; 3. a process spigot; 4. closing a screw; 5. a first shaft section; 6. a second shaft section; 7. a sleeve; 7a, a first end; 7b, a second end; 71. a first annular plate; 711. a first connection plate; 72. a second annular plate; 721. a second connecting plate; 8. a fixing assembly; 81. fixing the threaded holes; 82. a fixing bolt; 9. an adjustment assembly; 91. adjusting the threaded hole; 92. an adjusting bolt; 10. a closing bolt; 11. and a connecting piece.

Detailed Description

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

Fig. 2 is a schematic radial sectional view of the centering device of the present embodiment. Fig. 3 is an axial structural schematic diagram of the centering device of the present embodiment. As shown in fig. 2 and 3, the centering device of the present embodiment includes: sleeve 7, fixing assembly 8 and adjusting assembly 9. The sleeve 7 comprises a first end 7a and a second end 7b. The first end 7a is adapted to be sleeved on the end of the first shaft section 5. The second end 7b is used for inserting a second shaft section 6 connected with the first shaft section 5. The fixing component 8 is disposed on the sleeve 7 and near the first end 7a. The fixing assembly 8 is used for fixedly connecting the sleeve 1 with the first shaft section 5. An adjustment assembly 9 is provided on the sleeve 7 near the second end 7b. The adjustment assembly 9 is used to adjust the coaxiality between the second shaft section 6 and the first shaft section 5.

In some examples, referring to fig. 2 and 3, the sleeve 7 is made of metal. Such as stainless steel or other alloy materials. The sleeve 7 of the embodiment is made of metal, has the advantages of high strength, good wear resistance and difficult corrosion, and is long in service life, easy to obtain materials and low in cost.

In some examples, the securing assembly 8 may employ a plurality of rams, with the plurality of rams cooperating with hydraulic means to urge against the first shaft section 5 in the sleeve 7 to effect securing. So set up, it is more reliable to fix, and degree of automation is higher. However, in other embodiments, the fixing assembly 8 may also include a plurality of top blocks disposed on the inner wall of the sleeve 7 for holding the first shaft section 5. The present embodiment does not restrict this too much as long as fixation with the first shaft section 5 can be achieved.

In some examples, the adjusting assembly 9 may also use a plurality of ejector rods, and the plurality of ejector rods cooperate with hydraulic devices to push the second shaft section 6 in the sleeve 7 to move in the radial direction of the sleeve 7, so as to realize the position adjustment of the second shaft section 6. So set up, degree of automation is higher, and the speed of adjusting is faster.

The centering device of the embodiment is utilized for centering operation, so that the centering operation of each section of shaft in the sectional type combined shaft rotor can be effectively controlled, the centering operation of the sectional type combined shaft rotor is simplified, and the assembly precision and the assembly efficiency of the sectional type combined shaft rotor are improved. And the process spigot is not required to be designed at the end part of the shaft section, so that the blanking size of the main shaft is reduced, the cost of raw materials is reduced, the process is simplified, unnecessary processing procedures are reduced, the manufacturing cost is further reduced, and the manufacturing time is shortened. The centering device provided by the utility model effectively reduces the difficulty of centering operation, has no specific shape and position requirements on the placement direction of the shaft section (can be used in transverse placement or vertical placement), and can be suitable for centering adjustment of two sections of shafts in any shape and position.

In some embodiments, as shown in fig. 3, the sleeve 7 comprises: a first ring plate 71 and a second ring plate 72. The first ring plate 71 and the second ring plate 72 are each arc-shaped. The first ring plate 71 and the second ring plate 72 are fastened to each other and connected by the connecting member 11.

In some examples, the first ring plate 71 and the second ring plate 72 are both non-circular arc-shaped, and the first ring plate 71 and the second ring plate 72 are buckled with each other and connected through the connecting piece 11 to form the elliptical sleeve 7. By this arrangement, the application range of the sleeve 7 can be widened.

In some examples, when the first ring plate 71 and the second ring plate 72 are buckled with each other and connected by the connecting piece 11, the connection portion of the first ring plate 71 and the second ring plate 72 is not fit, but a gap is formed. The application range of the sleeve 7 can be enlarged, and the sleeve can be applied to a shaft with a larger diameter.

In some examples, the connection 11 may be at least one of a connection bolt, a buckle. The present embodiment does not have an excessive limitation as long as it can be detached easily.

The sleeve 7 of this implementation includes first crown 71 and second crown 72, and first crown 71 passes through connecting piece 11 detachable with second crown 72 and is connected, and sleeve 7 adopts split type structure promptly, can be favorable to overcoming harsh operating space restriction, easy to assemble and dismantlement improve the convenience of using.

In some embodiments, as shown in fig. 3, the first ring plate 71 and the second ring plate 72 are each circular arc-shaped and the first ring plate 71 is concentric with the second ring plate 72.

The first ring plate 71 and the second ring plate 72 of this embodiment are both arc-shaped, have equal diameters and are coaxial, the assembled sleeve 7 is a cylinder, and the inner side surface of the sleeve 7 can be fitted with the side surface shape of the spindle, so that the spindle is convenient to fix.

In some embodiments, as shown in fig. 3, the sleeve 7 further comprises: a pair of first connection plates 711 and a pair of second connection plates 721. A pair of first connection plates 711 are provided on both sides of the first ring plate 71, respectively. A pair of second connection plates 721 are provided on both sides of the second ring plate 72, respectively. The first connection plates 711 and the second connection plates 721 are in one-to-one correspondence and are attached to each other. The connection member 11 is connected between the first connection plate 711 and the second connection plate 721 on the same side.

The first ring plate 71 of the present embodiment is provided with a pair of first connection plates 711, the second ring plate 72 is provided with a pair of second connection plates 721, the first connection plates 711 are located radially outside the first ring plate 71, and the second connection plates 721 are located radially outside the second ring plate 72, so that the first ring plate 71 and the second ring plate 72 can be assembled and disassembled conveniently, and do not interfere with the spindle.

In some embodiments, as shown in fig. 2, the securing assembly 8 includes: a plurality of fixing screw holes 81 and a plurality of fixing bolts 82. A plurality of fixation threaded holes 81 are located in the wall of the sleeve 7 near the first end 7a. The plurality of fixation screw holes 81 are uniformly distributed along the circumferential direction of the sleeve 7. Each fixing bolt 82 is located in one fixing screw hole 81. One end of the fixing bolt 82 can extend into the interior of the sleeve 7 and abut against the side of the first shaft section 5.

In some examples, referring to fig. 2, the number of the fixing screw holes 81 is four, the four fixing screw holes 81 are uniformly distributed on the side surface of the sleeve 7 in the circumferential direction of the sleeve 7, and the fixing screw holes 81 penetrate the wall of the sleeve 7 in the radial direction of the sleeve 7. Each fixing bolt 82 is located in one fixing screw hole 81. One end of the fixing bolt 82 can extend into the interior of the sleeve 7 and abut against the side of the first shaft section 5. The arrangement in this way makes it possible to fix the first shaft section 5 in four directions with greater reliability. However, it is to be understood that in other embodiments, the number of the fixing screw holes 81 may be three, or may be more than four, and this embodiment is not limited thereto, as long as the fixing with the first shaft section 5 can be achieved.

The fixing assembly 8 of the present embodiment includes a plurality of fixing threaded holes 81 and a plurality of fixing bolts 82, and the first shaft section 5 is fixed by utilizing the cooperation of the plurality of fixing threaded holes 81 and the plurality of fixing bolts 82, and is simple in structure and reliable in fixation.

In some embodiments, as shown in fig. 2, the adjustment assembly 9 comprises: a plurality of adjustment screw holes 91 and a plurality of adjustment bolts 92. A plurality of adjustment threaded holes 91 are located in the wall of the sleeve 7 near the second end 7b. The plurality of adjustment screw holes 91 are uniformly distributed along the circumferential direction of the sleeve 7. Each of the adjustment bolts 92 is located in one of the adjustment threaded holes 91. One end of the adjusting bolt 92 can extend into the interior of the sleeve 7 and abut against the side of the second shaft section 6. By turning the adjusting bolt 92, the position of the second shaft section 6 in the sleeve 7 can be shifted.

In some examples, as shown in fig. 3, the number of the adjustment screw holes 91 is four, the four adjustment screw holes 91 are uniformly distributed on the side surface of the sleeve 7 in the circumferential direction of the sleeve 7, and the adjustment screw holes 91 penetrate the wall of the sleeve 7 in the radial direction of the sleeve 7. Each of the adjustment bolts 92 is located in one of the adjustment threaded holes 91. One end of the adjusting bolt 92 can extend into the interior of the sleeve 7 and abut against the side of the second shaft section 6. The arrangement in this way allows the second shaft section 6 to be adjusted in four directions with greater reliability.

However, it is to be understood that in other embodiments, the number of the adjusting screw holes 91 may be three, or may be more than four, so long as the second shaft section 6 can be adjusted.

The adjusting assembly 9 of the present embodiment includes a plurality of adjusting screw holes 91 and a plurality of adjusting bolts 92, and the position of the second shaft section 6 can be adjusted by changing the length of the adjusting bolts 92 extending into the sleeve 7, and the structure is simple and easy to operate.

In some embodiments, referring to fig. 2, the adjustment assembly 9 further includes a plurality of lock nuts. Each lock nut is arranged on one of the adjusting bolts 92 and is located outside the sleeve 7.

In some examples, referring to fig. 2, a lock nut may be disposed on each of the fixing bolt 82 and the adjusting bolt 92 near the outer side of the sleeve, so that the fixing assembly 8 fixes the first shaft section 5 and the adjusting assembly 9 to the second shaft section 6 more stably and reliably, but the lock nut should be fastened after the shaft section centering adjustment is completed.

In some examples, the centering device can be used in combination of multiple sets when needed, and the centering device can be subjected to targeted integral fine adjustment after all shaft segments are assembled. In particular, the number of centering devices is related to the number of shaft segments, for example, in the case where two shaft segments constitute one shaft, the number of centering devices is one; in the case that three shaft segments form one shaft, the number of centering devices is two, and so on.

The multiple centering devices of the present embodiment are used in combination, meaning that the centering device between the first two shaft segments is not removed after the butt joint is completed, and another centering device is used when the third shaft segment is connected, i.e. one centering device is needed for each shaft segment. In this way, after the connection of all the shaft sections is completed, the coaxiality measurement can be performed again, and if deviation occurs, the centering device among the shaft sections can be directly utilized for fine adjustment.

The embodiment also provides a centering method, and the centering method of the embodiment utilizes the centering device in the embodiment.

Fig. 4 is a flowchart of the centering method of the present embodiment. As shown in fig. 4, the centering method of the present embodiment includes the following steps:

s1, a first end 7a of a sleeve 7 is sleeved on the end part of the first shaft section 5, and the sleeve 7 is fixed on the first shaft section 5 by using a fixing assembly 8.

Specifically, before the first end 7a of the sleeve 7 is sleeved on the end of the first shaft section 5, the first shaft section 5 needs to be effectively fixed, so that stability of the centering process can be ensured.

Illustratively, one end of the first shaft section 5 is clamped and secured, and the sleeve 7 is mounted to the other end of the first shaft section 5. Alternatively, the middle part of the first shaft section 5 is clamped and fixed, and the sleeve 7 is mounted on one end of the first shaft section 5.

S2, one end of the second shaft section 6 is inserted into the second end 7b of the sleeve 7, the other end of the second shaft section 6 is supported in an auxiliary mode, and the second shaft section 6 and the first shaft section 5 are positioned roughly by means of the fastening bolt 10.

In particular, the coarse positioning means that the union bolt 10 is not to be tightened, even if the second shaft section 6 is connected to the first shaft section 5, and the second shaft section 6 is provided with an adjustment margin.

S3, measuring the coaxiality of the second shaft section 6 and the first shaft section 5, and recording the deviation value and direction.

Specifically, the coaxiality of the second shaft section 6 and the first shaft section 5 can be measured by using a three-coordinate measuring instrument, a dial indicator and other measuring devices, and the embodiment does not have excessive limitation, so long as the purpose of measurement can be achieved.

S4, according to the deviation value and the direction, the position of the second shaft section 6 in the sleeve 7 is adjusted by the adjusting assembly 9 until the coaxiality of the second shaft section 6 and the first shaft section 5 reaches the tolerance range.

Specifically, the position of the second shaft section 6 in the sleeve is adjusted according to the deviation value and direction, i.e. the second shaft section 6 is pushed in the opposite direction to the offset direction. It should be noted that the distance pushed should be finely adjusted according to the deviation value, a small number of times, so as to avoid the adjustment distance being larger than the offset distance.

S5, tightening the closing bolt 10 to connect the first shaft section 5 with the second shaft section 6.

Specifically, when the coaxiality of the second shaft section 6 and the first shaft section 5 reaches within the tolerance range, the relative positions of the first shaft section 5 and the second shaft section 6 already meet the use requirement, and at this time, the fastening bolt 10 can be screwed down to fixedly connect the first shaft section 5 and the second shaft section 6. In this way, the position of the second shaft section 6 can be prevented from moving, and the deviation can be prevented from increasing.

S6, detaching the sleeve 7 and mounting the first end 7a of the sleeve 7 to the free end of the second shaft section 6 for the next shaft section.

Specifically, in some examples, as shown in fig. 3, the sleeve 7 includes a first ring plate 71 and a second ring plate 72. The first ring plate 71 and the second ring plate 72 are fastened to each other and connected by the connecting member 11. When the sleeve 7 is disassembled, the connecting piece 11 on the sleeve 7 is disassembled firstly, and the sleeve 7 is directly taken down after being divided into two flaps. So set up, make things convenient for sleeve 7's installation and dismantlement.

In other examples, the sleeve 7 is of unitary construction, it may be necessary to first loosen the securing assembly 8, and then move the sleeve 7 axially of the second shaft section 6 to the free end of the second shaft section 6.

The centering method of the embodiment utilizes the centering device in the embodiment, so that the centering device has the advantages of simplicity in operation, stable structure, low centering difficulty and wide application range.

In some embodiments, as shown in fig. 5, tightening the union bolt 10 connects the first shaft section 5 with the second shaft section 6, and then further comprises:

the coaxiality of the first shaft section 5 and the second shaft section 6 is retested.

Specifically, after the fastening bolt 10 is screwed, the first shaft section 5 and the second shaft section 6 are fixedly connected, and coaxiality of the first shaft section 5 and the second shaft section 6 is retested, so that the position of the second shaft section 6 is prevented from being deviated in the process of screwing the fastening bolt 10. If the measurement results show that the coaxiality of the first shaft section 5 and the second shaft section 6 is within the tolerance requirement range, the sleeve 7 can be detached for the installation of the next shaft section. If the measurement results are that the coaxiality of the first shaft section 5 and the second shaft section 6 is out of the tolerance requirement range, the handle and bolt 10 needs to be loosened, and the second shaft section 7 needs to be adjusted and positioned again.

The embodiment can ensure that the use requirement can be met after the sectional type combined shaft is assembled by adding the retest step.

In some embodiments, as shown in fig. 6, adjusting the position of the second shaft section 6 in the sleeve 7 by the adjusting component 9 according to the deviation value and direction until the coaxiality of the second shaft section 6 and the first shaft section 5 is within the tolerance range comprises:

the position of the second shaft section 6 in the sleeve 7 is fine-tuned according to the deviation value and direction. Then, the coaxiality of the second shaft section 6 and the first shaft section 5 is measured again, and the deviation value and the direction are recorded.

The above steps are repeated until the coaxiality of the second shaft section 6 and the first shaft section 5 reaches the tolerance range.

In this embodiment, the second shaft section 6 is adjusted a small amount for many times, so that the accuracy of adjusting the direction and the distance can be ensured, and the reverse error can be prevented from being increased.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiment of the present utility model is not intended to limit the utility model to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model. The foregoing is merely a preferred embodiment of the present application and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the present application.

Claims (5)

1. A centering device, comprising:

a sleeve comprising a first end and a second end; the first end is used for being sleeved at the end part of the first shaft section; the second end is used for inserting a second shaft section connected with the first shaft section;

the fixing assembly is arranged at the first end of the sleeve; the fixing assembly is used for fixedly connecting the sleeve with the first shaft section;

the adjusting component is arranged at the second end of the sleeve; the adjusting assembly is used for adjusting coaxiality between the second shaft section and the first shaft section; wherein,

the fixing assembly includes:

a plurality of fixed threaded holes are positioned on the wall of the first end of the sleeve; the plurality of fixing threaded holes are uniformly distributed along the circumferential direction of the sleeve;

a plurality of fixing bolts, each of which is located in one of the fixing screw holes; one end of the fixing bolt can extend into the sleeve and is abutted against the side surface of the first shaft section;

the adjustment assembly includes:

the plurality of adjusting threaded holes are positioned on the wall of the second end of the sleeve; the plurality of adjusting threaded holes are uniformly distributed along the circumferential direction of the sleeve;

a plurality of adjustment bolts, each of which is located in one of the adjustment threaded holes; one end of the adjusting bolt can extend into the sleeve and is abutted against the side surface of the second shaft section; by turning the adjusting bolt, the position of the second shaft section in the sleeve can be shifted.

2. The centering device of claim 1, wherein the sleeve comprises: a first ring plate and a second ring plate; the first annular plate and the second annular plate are arc-shaped;

the first annular plate and the second annular plate are buckled with each other and are connected through a connecting piece.

3. The centering device of claim 2, wherein the first ring plate and the second ring plate are each arcuate and the first ring plate is coaxial with the second ring plate.

4. A centering device as claimed in claim 2 or claim 3, wherein the sleeve further comprises:

the pair of first connecting plates are respectively arranged at two sides of the first annular plate;

the pair of second connecting plates are respectively arranged at two sides of the second annular plate;

the first connecting plates and the second connecting plates are in one-to-one correspondence and are mutually attached; the connecting piece is connected between the first connecting plate and the second connecting plate on the same side.

5. The centering device of claim 1, wherein the adjustment assembly further comprises a plurality of lock nuts; each lock nut is arranged on one adjusting bolt and is positioned on the outer side of the sleeve.