Benchmark pad assembly, rotor assembly structure, and assembly method

Abstract

The application relates to a reference pad assembly, a rotor assembly structure and an assembly method. The reference pad assembly comprises a reference pad, a rotating disc supported on the reference pad and capable of rotating around an axis of the pad assembly, at least three linkage mechanisms, each comprising a linkage part and a contact part connected with the linkage part, and a driving mechanism connected with the rotating disc and used for driving the rotating disc to rotate around the axis. The linkage part can drive the contact part to move in the radial direction along with the rotating disc rotating around the axis, and is used for abutting against the inner wall of a disc core hole of a rotor disc with different radial dimensions.

Description

Technical Field

[0001] This invention relates to the field of assembly, and in particular to a reference pad assembly, a rotor assembly structure, and an assembly method. Background Technology

[0002] The rotor is a crucial component of turbomachinery, such as a gas turbine engine. Taking the rotor of a gas turbine engine as an example... Figure 1 As shown, the low-pressure turbine rotor 100 includes multiple turbine disks. Each turbine disk has a similar structure but differs in radial dimensions and size. For example... Figure 1 As shown, the multi-stage turbine disk includes a first turbine disk 101, a second turbine disk 102, and a third turbine disk 103, each with a different size of its center hole.

[0003] To ensure rotor assembly quality, the runout of the single-stage turbine disk must be checked (measured) on the end face of the disk center hole, the cylindrical surface, and the end faces of the front and rear mounting edges before assembly. The measurement of form and position tolerances must be completed on the turntable, and the turbine disk to be measured must be aligned before measurement. Summary of the Invention

[0004] One object of the present invention is to provide a reference pad assembly.

[0005] One object of the present invention is to provide a rotor assembly structure.

[0006] One object of the present invention is to provide a rotor assembly method.

[0007] According to one aspect of the present invention, a reference pad assembly includes a reference pad; a turntable supported on the reference pad and rotatable about an axis of the pad assembly; at least three linkage mechanisms, each linkage mechanism including a linkage part and a contact part connected to the linkage part; and a drive mechanism connected to the turntable for driving the turntable to rotate about the axis; wherein the linkage part is capable of causing the contact part to undergo radial displacement as the turntable rotates about the axis, for abutting against the inner wall of the center hole of a rotor disk with different radial dimensions.

[0008] In one or more embodiments of the reference pad assembly, the radial periphery of the reference pad defines the radial dimension periphery boundary of the reference pad assembly, and the reference pad is coaxially disposed with the turntable.

[0009] In one or more embodiments of the reference pad assembly, the reference pad includes a first annular body and an extension extending radially outward from the first annular body, each extension corresponding to each linkage mechanism. The first annular body is provided with a plurality of positioning stops in the circumferential direction, the plurality of positioning stops forming a ring concentric with the first annular body in the circumferential direction. The turntable includes a second annular body, the plurality of positioning stops cooperating with the inner ring of the second annular body for positioning.

[0010] In one or more embodiments of the reference pad assembly, the linkage mechanism includes a connecting rod, one side of which is pivotally connected to the reference pad via a first shaft, allowing the connecting rod to rotate about the first shaft, and the other side of which is connected to the contact portion; the turntable is provided with a limiting guide, and the body of the connecting rod cooperates with the limiting guide, allowing the connecting rod to move relative to the turntable along the limiting guide.

[0011] In one or more embodiments of the reference pad assembly, the radial end of the connecting rod has a pivot connection hole, and the first shaft is mounted and fixed to the reference pad and pivotally connected to the pivot connection hole.

[0012] In one or more embodiments of the reference pad assembly, the limiting guide is a limiting guide groove, which is installed and fixed to the second annular body. The two groove walls of the limiting guide groove form a displacement track for the body of the connecting rod, so that the connecting rod can move relative to the turntable along the extension direction of the groove wall.

[0013] In one or more embodiments of the reference pad assembly, the contact portion has a rolling contact element that is pivotally connected to the other radial end of the connecting rod via a second shaft element. The rolling contact element is rotatable about the second shaft element and is used to rollably abut against the inner wall of the disc center hole of the rotor disc.

[0014] In one or more embodiments of the reference pad assembly, the drive mechanism includes a first base, a second base, and a drive rod. The first base is fixedly mounted to the reference pad, the second base is fixedly mounted to the turntable, and the drive rod includes a head and a body. The head of the drive rod abuts against the first base, and the body of the drive rod engages with the second base. Rotation of the drive rod causes the second base to move along the extension direction of the body, thereby causing the turntable fixed thereto to rotate.

[0015] According to one aspect of the present invention, a rotor assembly structure includes a rotor disk, such as the reference pad disk assembly described in any of the preceding claims; wherein the disk body of the rotor disk abuts against the reference pad disk, and the inner wall of the disk center hole of the rotor disk abuts against the contact portion.

[0016] According to one aspect of the present invention, a rotor assembly method is adopted, using a reference pad assembly as described in any one of the above claims; the body of a first rotor disk of the rotor is brought into contact with the reference pad, and the drive mechanism is operated to move the contact portion to abut against the inner wall of the center hole of the first rotor disk; the body of a second rotor disk of the rotor is brought into contact with the reference pad, and the drive mechanism is operated to move the contact portion to abut against the inner wall of the center hole of the second rotor disk.

[0017] The advantages of using the reference pad assembly described above include: through the coordinated action of the turntable, linkage mechanism, and drive mechanism, the reference pad assembly possesses a self-aligning function. Within a certain range, it can perform internal support-type centering of the center hole of rotor disks with different radial dimensions, ensuring that the rotor disk and the reference pad axis are aligned. This meets the requirements for dimensional and positional tolerance checks of the rotor disk on the turntable and enables rapid centering and measurement of turbine disks of different sizes on the turntable. Furthermore, the coordinated action of the turntable, linkage mechanism, and drive mechanism also allows for adjustment of the internal support-type clamping and fixing state of the rotor disk, facilitating the installation and removal of the rotor disk from the reference pad assembly. Attached Figure Description

[0018] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments. It should be noted that the drawings are merely illustrative and are not drawn to scale, and should not be construed as limiting the scope of protection actually claimed by the present invention, wherein:

[0019] Figure 1 This is a schematic diagram of the low-pressure turbine rotor of a gas turbine engine.

[0020] Figure 2 This is a schematic diagram of the rotor assembly structure of one embodiment.

[0021] Figure 3A , Figure 3B This is a schematic diagram of the first and second states of a rotor assembly structure according to an embodiment.

[0022] Figure 4 This is a schematic diagram of the structure of a reference pad assembly according to one embodiment.

[0023] Figure 5 It is based on Figure 4 A partial structural breakdown diagram.

[0024] Figure 6 It is based on Figure 4 A schematic diagram of the decomposition of another part of the structure.

[0025] Figure Labels

[0026] 100 - Low-pressure turbine rotor, 101 - First turbine disk, 102 - Second turbine disk, 103 - Third turbine disk;

[0027] 200 - Rotor assembly structure, 10 - Reference pad assembly, 20 - Rotor disk;

[0028] 1-Reference pad, 2-Turntable, 3-Linkage mechanism, 4-Drive mechanism, X1-Axis;

[0029] 11-First annular body, 12-Extension, 111-Positioning stop, 21-Second annular body, 211-Inner ring, 212-Mounting hole, 213-Lug, 22-Limiting guide, 220-Limiting guide groove, 2201, 2202-Groove wall, 31-Linkage part, 32-Contact part, 311-Connecting rod, 3111-One side of connecting rod, 3112-The other side of connecting rod, 3113-Body of connecting rod, 3110-Pivot connection hole, 321-Rolling contact, 3211-Connecting hole, 51-First shaft, 52-Second shaft, 521-Threaded hole, 53-Retaining ring, 41-First seat, 411-Protrusion, 42-Second seat, 421-Protrusion, 43-Drive rod, 431-Head, 432-Body, 6-Screw, 201-Disc center hole. Detailed Implementation

[0030] The following discloses various implementation methods or embodiments of the described subject matter. To simplify the disclosure, specific examples of the elements and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of protection of the present invention.

[0031] Furthermore, it should be understood that terms such as "an embodiment," "one embodiment," and / or "some embodiments," or "one or more embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," "some embodiments," or "one or more embodiments" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. Moreover, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0032] The rotor is a crucial component of turbomachinery, such as a gas turbine engine. Taking the rotor of a gas turbine engine as an example... Figure 1 As shown, the low-pressure turbine rotor 100 includes multiple turbine disks. Each turbine disk has a similar structure but differs in radial dimensions and size. For example... Figure 1 As shown, the multi-stage turbine disk includes a first turbine disk 101, a second turbine disk 102, and a third turbine disk 103, each with a different size of its center hole.

[0033] To ensure rotor assembly quality, the runout of the single-stage turbine disk must be checked (measured) on the end face of the disk center hole, the cylindrical surface, and the end faces of the front and rear mounting edges before assembly. The measurement of form and position tolerances must be completed on the turntable, and the turbine disk to be measured must be aligned before measurement.

[0034] Currently, there are two methods for aligning turbine disks on a turntable: manual alignment and interference fit to ensure the turbine disk under test aligns with the reference pad axis. Manual alignment requires repeated adjustments by the operator, which lengthens the adjustment time and consequently increases the turbine disk's form and position tolerance inspection cycle. Interference fit, on the other hand, requires different reference pads for different turbine disks to ensure proper fit, increasing the variety of tooling and manufacturing costs.

[0035] Based on the above, the inventors, through in-depth research, invented a reference pad assembly, a rotor assembly structure, and an assembly method. By leveraging the synergistic action of the turntable, linkage mechanism, and drive mechanism, the reference pad assembly possesses a self-aligning function. Within a certain range, it can perform internal support-type centering of the rotor disk's center hole with different radial dimensions, ensuring that the rotor disk and the reference pad's axis remain aligned, thus meeting the requirements for dimensional and positional tolerance checks of the rotor disk on the turntable. Furthermore, the synergistic action of the turntable, linkage mechanism, and drive mechanism also allows for adjustment of the rotor disk's internal support-type clamping and fixing state, facilitating the installation and removal of the rotor disk from the reference pad assembly.

[0036] The reference pad assembly, rotor assembly structure, and assembly method disclosed in this application solve the problem of rapid centering measurement on a turntable during rotor assembly of multi-stage turbine disks of different sizes. However, it should be understood that the reference pad assembly, rotor assembly structure, and assembly method disclosed in this application are not limited to turbine disks of gas turbine engines. For example, they can also be used for compressor disks or other rotor disks of different sizes, solving the problem of rapid centering measurement during assembly.

[0037] In the following embodiments, the rotor disk is taken as the low-pressure turbine disk of a gas turbine engine, but it is not limited to this. For example, it can also be a compressor disk.

[0038] refer to Figure 2 , Figure 3A , Figure 3B As shown, the rotor assembly structure 200 includes a reference pad assembly 10 and a rotor disk 20. The reference pad 1 of the reference pad assembly 10 supports and positions the axial end face of the rotor disk 20, and the contact portion 32 of the reference pad assembly 10 abuts against the inner wall of the disk center hole 201 of the rotor disk 20. Figure 3A , Figure 3B As shown, the contact portion 32 can be radially displaced. Figure 3A In the first state of the rotor assembly structure 200 shown, the contact part 32 is not in contact with the inner wall of the disc center hole 201 of the rotor disk 20. At this time, it has not yet been aligned, that is, the axis of the rotor disk 20 and the reference pad 1 may not be aligned. However, as... Figure 3B Compared to Figure 3A The contact part 32 undergoes radial displacement, and it comes into contact with the inner wall of the disc center hole 201 of the rotor disc 20. At this time, centering is achieved and alignment is completed, and the rotor disc 20 is aligned with the axis of the reference pad disc 1.

[0039] refer to Figures 4 to 6 In some embodiments, the reference pad assembly 10 includes a reference pad 1, a turntable 2, at least three linkage mechanisms 3, and a drive mechanism 4. The reference pad 1 serves to support the rotor disk 20 and maintain a fixed position during alignment, acting as a reference. The turntable 2 is supported on the reference pad 1 and can rotate relative to the reference pad 1 about the axis X1 of the reference pad assembly 10. The turntable 2 and the reference pad 1 are coaxially arranged, and the axis X1 of the reference pad assembly 10 is also the axis of the turntable 2 and the reference pad 1. Each linkage mechanism 3 includes a linkage part 31 and a contact part 32 connected to the linkage part 31. The drive mechanism 4 is connected to the turntable 2 and is used to drive the turntable 2 to rotate about the axis X1.

[0040] Combination Figure 3A as well as Figure 3B As shown, the linkage 31 can drive the contact part 32 to undergo radial displacement as the turntable 2 rotates around the axis X1, for example from... Figure 3A Position displacement to Figure 3B The contact part 32 is positioned such that it abuts against the inner wall of the center hole 201 of the rotor disk 20. It can be understood that when aligning another turbine disk of a different size, the radial dimension of the center hole is different from that of the center hole 201. As long as the linkage part 31 is radially displaced to another radial position, the contact part 32 is also displaced to another radial position, thereby abutting against the inner wall of the center hole of the other turbine disk of a different size. That is, the contact part 32 can be used to abut against the inner wall of the center hole of a rotor disk of a different radial size as the linkage part 31 is radially displaced.

[0041] The principle of employing at least three linkage mechanisms lies in the three-point centering principle, such as... Figures 4 to 6 As shown, three linkage mechanisms 3 are generally sufficient, but it is possible that the reference pad assembly 10 may include more than three linkage mechanisms 3.

[0042] The beneficial effects of the above embodiments are that, through the coordinated action of the turntable 2, the linkage mechanism 3, and the drive mechanism 4, the reference pad assembly 10 has a self-aligning function. Within a certain range, it can perform internal support centering of the center hole of rotor disks with different radial dimensions, ensuring that the axis of the rotor disk is consistent with that of the reference pad 1. This meets the requirement for dimensional and positional tolerance checks of the rotor disk on the turntable, and enables rapid centering and measurement of turbine disks of different sizes on the turntable. In addition, the coordinated action of the turntable, the linkage mechanism, and the drive mechanism can also adjust the internal support clamping and fixing state of the rotor disk, facilitating the installation and removal of the rotor disk from the reference pad assembly.

[0043] Continue to refer to Figures 4 to 6 In some embodiments, the radial periphery of the reference pad 1 limits the radial dimension of the reference pad assembly 10, and the reference pad 1 is coaxially arranged with the turntable 2. For example... Figures 4 to 6 As shown, the turntable 2 is located within the radially defined space of the reference pad 1. This arrangement allows the reference pad 1 to support and position the rotor disk 20, while the contact portion 32 abuts against the inner wall of the disk center hole 201 of the rotor disk 20. This multiple positioning method ensures reliable positioning of the reference pad assembly 10 on the rotor disk 20, guaranteeing accurate and reliable alignment, runout checks (measurements), and geometric tolerance measurements. Furthermore, it results in a compact structure for the pad assembly 10 and minimizes the dimensions of the reference pad, thus reducing tooling processing costs.

[0044] Continue to refer to Figures 4 to 6 In some embodiments, the reference pad 1 includes a first annular body 11 and extensions 12 extending radially outward from the first annular body 11. Each extension 12 corresponds to the linkage mechanism 3, that is, the number of extensions 12 corresponds to the number of linkage mechanisms 3. As shown in the figure, three linkage mechanisms 3 correspond to three extensions 12. The first annular body 11 has multiple positioning stops 111 arranged circumferentially, forming a ring concentric with the first annular body 11. The turntable 2 includes a second annular body 21, with the multiple positioning stops 111 engaging with the inner ring of the second annular body 21 for positioning. The inner ring 211 of the second annular body 21 matches the ring formed circumferentially by the multiple positioning stops 111. Compared to the structure of an entire disc, the reference pad 1 using the structure of the first annular body 11 and the extensions 12 in the embodiments has a better lightweight effect. The engagement of the positioning stop 111 with the second annular body 21 forms a shaft hole fit with the inner hole of the turntable, ensuring the coaxiality of the turntable 2 and the pad 1. This effectively ensures the synchronization of the movement of multiple linkage mechanisms 3, improves the synchronization of contact parts, and enhances positioning accuracy.

[0045] Continue to refer to Figures 4 to 6In some embodiments, the linkage part 31 of the linkage mechanism 3 includes a connecting rod 311. One side 3111 of the connecting rod 311 is pivotally connected to the reference pad 1 via a first shaft 51, allowing the connecting rod 311 to rotate around the first shaft 51. The other side 3112 of the connecting rod 311 is connected to the contact part 32. The turntable 2 is provided with a limiting guide 22. The body 3113 of the connecting rod 311 cooperates with the limiting guide 22, allowing the connecting rod 31 to move relative to the turntable 2 along the limiting guide 22, thereby realizing the movement of the contact part 32 from... Figure 3A The position is radially displaced to Figure 3B The specific structure of the pivot connection can be such that the first shaft 51 is fixed to the reference pad 1 in the form of a boss, while the radial end of the connecting rod 311 provides a pivot connection hole 3110, and the first shaft 51 passing through the pivot connection hole 3110 is stopped and positioned by a retaining ring 53. This is easy to assemble and the pivot connection structure is reliable and stable. However, this is not a limitation; for example, the radial end of the connecting rod 311 can also provide the first shaft 51, while the first pad 1 provides the pivot connection hole 3110. By adopting a linkage mechanism in which the pivot connection and the limiting guide work together, it is possible to realize that operating a single drive mechanism 4 can synchronously move the contact parts 32 corresponding to at least three linkage mechanisms 3, which have good synchronization and high positioning accuracy.

[0046] Continue to refer to Figures 4 to 6 As shown, in some embodiments, the limiting guide 22 is a limiting guide groove 220, which is installed and fixed to the second annular body 21. The two groove walls 2201 and 2202 of the limiting guide groove 220 form the displacement track of the body 3113 of the connecting rod 311. The body 3113 of the connecting rod 311 is squeezed on both sides by the two groove walls 2201 and 2202, so that the connecting rod 311 can move relative to the turntable 2 along the extension direction of the groove walls 2201 and 2202, thereby realizing the reciprocating swing of the connecting rod 311 around the axis X1 and changing the internal support clamping state of the rotor disk 20. The structure in which the limiting guide groove 220 is installed and fixed to the second annular body 21 can be such that the second annular body 21 is provided with a mounting hole 212, and the bottom of the limiting guide groove 220 is provided with a threaded section that is detachably connected to the mounting hole 212. The scheme of using the limiting guide groove 220 for limiting guidance has a simple structure and is easy to assemble. However, this is not a limitation; the structure of the limiting guide can also be a slider, and the body 3113 of the connecting rod 311 can be groove-shaped. The slider and the groove-shaped body 3113 can also achieve limiting guidance. Additionally, as... Figures 4 to 6 As shown, the connecting rod 311 may not be strictly pointing towards the center, i.e., axis X1. Therefore, the radial displacement of the contact part 32 does not mean that the contact part 32 is only displaced in the radial direction. For example, the contact part 32 may also be displaced in the circumferential direction at the same time. Furthermore, the combined movement of radial and circumferential displacement can make the centering more accurate.

[0047] Continue to refer to Figures 4 to 6 In some embodiments, the contact portion 32 has a rolling contact element 321, i.e., a roller-like structure as shown in the figure. The rolling contact element 321 has a connecting hole 3211 and is pivotally connected to the other radial end of the connecting rod 311 via a second shaft 52. The rolling contact element 32 can rotate around the second shaft 52 and is used to rollably abut against the inner wall of the disc center hole 201 of the rotor disk 20. Using a rolling contact element 321, such as a roller, as the contact portion to contact the inner wall of the disc center hole 201, the rolling contact element is easy to position and can be quickly fixed on the connecting rod 311 through a simple shaft hole fit and end face blocking. Moreover, the rolling contact element and the wall surface of the disc center hole 201 of the rotor disk 20 have line contact, which can improve centering stability and avoid damage to the wall surface of the disc center hole 201. The mounting structure of the rolling contact element 32 can be that the second shaft 52 has a threaded hole 521, and a screw 6 is used to connect to the threaded hole 521. The head of the screw 6 can axially stop the rolling contact element 321.

[0048] Continue to refer to Figures 4 to 6In some embodiments, the drive mechanism 4 may include a first seat 41, a second seat 42, and a drive rod 43. The first seat 41 is mounted and fixed to the reference pad 1, and the second seat 42 is mounted and fixed to the turntable 2. Specifically, the mounting and fixing structure may involve the protrusion 411 of the first seat 41 engaging with the connecting hole of the reference pad 1, and the protrusion 411 having a threaded hole. A screw 6 is connected to this threaded hole, fixing the first seat 41 to the reference pad 1 on the other axial side. The protrusion 421 of the second seat 42 engages with a lug 213 extending radially from the second annular body 21 of the turntable 2, and the protrusion 421 has a threaded hole. A screw 6 is connected to this threaded hole on the other axial side of the turntable 2, fixing the second seat 42 to the turntable 2 on the other axial side. The drive rod 43 includes a head 431 and a body 432. The head 431 of the drive rod 43 abuts against the first base 41, and the body 432 of the drive rod 43 cooperates with the second base 42. When it is necessary to drive the linkage 3 to move, the rotation of the drive rod 43 drives the second base 42 to move along the extension direction of the body 432, so as to drive the turntable 2 fixedly connected to the second base 42 to rotate, so as to drive the connecting rod 311 to rotate relative to the reference pad 1 around the first shaft 51, and to move relative to the turntable 2 along the guide member 22, thereby realizing the displacement of the contact part 32, so as to contact the disc center hole of different sizes and align the rotor disc of different sizes. Specifically, the body 432 may have an external threaded section, and the second seat 42 may have an internal threaded section that mates with the external threaded section. During centering, rotating the manual or automatic drive rod 43 causes the head 431 of the drive rod 43 to stop against the first seat 41. That is, the drive rod 43 itself only rotates around its own axis without displacement, while the second seat 42 moves along the extension direction of the body 432 of the drive rod 43, thereby driving the turntable 2 to reciprocate. The advantage of using a threaded structure is that the threaded connection has self-locking properties, which allows the turntable 2 to be locked in any adjustable position when it is driven to rotate, thereby achieving centering stability. The specific centering process is as follows: when the drive rod 43 rotates, it drives the second seat 42 to move, thereby realizing the rotation of the turntable 2 clockwise or counterclockwise along the axial direction. The limiting guide 22 installed on the turntable 2 pushes multiple connecting rods 311 to swing clockwise or counterclockwise around the inner axis in a synchronized manner, so that the rolling contact part 321 installed on the connecting rod 311 presses the hole wall of the disc center hole 201 of the rotor disc 20. Under the action of the rolling contact part 321, the rotor disc 20 is centered (fixed axis) on the reference pad 1.

[0049] Based on the above description, this application also provides a rotor assembly method using the reference pad assembly 10 described in any of the above embodiments. The method includes the following steps:

[0050] The first rotor disk of the rotor abuts against the reference pad 1, and the drive mechanism 4 is operated to move the contact part 32 to abut against the inner wall of the disk center hole of the first rotor disk.

[0051] The second rotor disk of the rotor is brought into contact with the reference pad disk 1, and the drive mechanism 4 is operated to move the contact part 32 to abut against the inner wall of the disk center hole of the second rotor disk.

[0052] The first rotor disk and the second rotor disk mentioned above refer to the assembly of multiple rotor disks. For example, a low-pressure turbine includes multiple rotor disks. It can be understood that the first rotor disk and the second rotor disk are only a minimum number of rotor disks. The assembly method may also include the alignment steps of the third rotor disk, the fourth rotor disk, and all the rotor disks of the rotor to be assembled.

[0053] While the present invention has been disclosed above with reference to the embodiments described, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A reference pad assembly, characterized in that, include: Reference pad; The turntable is supported on the reference pad and is rotatable about the axis of the pad assembly; At least three linkage mechanisms, each linkage mechanism including a linkage part and a contact part connected to the linkage part; A drive mechanism, connected to the turntable, is used to drive the turntable to rotate around the axis; The linkage part can drive the contact part to undergo radial displacement as the turntable rotates around the axis, so as to abut against the inner wall of the disc center hole of rotor discs with different radial dimensions.

2. The reference pad assembly as described in claim 1, characterized in that, The radial periphery of the reference pad defines the radial dimension periphery of the reference pad assembly, and the reference pad is coaxially disposed with the turntable.

3. The reference pad assembly as described in claim 2, characterized in that, The reference pad includes a first annular body and an extension extending radially outward from the first annular body. Each extension corresponds to each linkage mechanism. The first annular body is provided with a plurality of positioning stops in the circumferential direction. The plurality of positioning stops form a ring concentric with the first annular body in the circumferential direction. The turntable includes a second annular body. The plurality of positioning stops cooperate with the inner ring of the second annular body for positioning.

4. The reference pad assembly as described in claim 3, characterized in that, The linkage mechanism includes a connecting rod, one side of which is pivotally connected to the reference pad via a first shaft, allowing the connecting rod to rotate around the first shaft. The other side of the connecting rod is connected to the contact portion. The turntable is provided with a limiting guide, and the body of the connecting rod cooperates with the limiting guide, allowing the connecting rod to move relative to the turntable along the limiting guide.

5. The reference pad assembly as described in claim 4, characterized in that, The connecting rod has a pivot connection hole at one radial end, and the first shaft is mounted and fixed to the reference pad and pivotally connected to the pivot connection hole.

6. The reference pad assembly as claimed in claim 4, characterized in that, The limiting guide is a limiting guide groove, which is installed and fixed to the second annular body. The two groove walls of the limiting guide groove form the displacement track of the body of the connecting rod, so that the connecting rod can move relative to the turntable along the extension direction of the groove wall.

7. The reference pad assembly as claimed in claim 4, characterized in that, The contact portion has a rolling contact element, which is pivotally connected to the other radial end of the connecting rod via a second shaft. The rolling contact element is rotatable about the second shaft and is used to roll against the inner wall of the disc center hole of the rotor disc.

8. The reference pad assembly as claimed in claim 1, characterized in that, The driving mechanism includes a first base, a second base, and a driving rod. The first base is fixed to the reference pad, and the second base is fixed to the turntable. The driving rod includes a head and a body. The head of the driving rod abuts against the first base, and the body of the driving rod cooperates with the second base. The rotation of the driving rod causes the second base to move along the extension direction of the body, thereby causing the turntable fixed to it to rotate.

9. A rotor assembly structure, characterized in that, include: Rotor disk; The reference pad assembly as described in any one of claims 1-8; The rotor disk body abuts against the reference pad disk, and the inner wall of the rotor disk's center hole abuts against the contact portion.

10. A rotor assembly method, characterized in that, The reference pad assembly as described in any one of claims 1-8 is used; The first rotor disk of the rotor abuts against the reference pad disk, and the drive mechanism is operated to move the contact portion to abut against the inner wall of the disk center hole of the first rotor disk. The second rotor disk of the rotor is brought into contact with the reference pad, and the drive mechanism is operated to move the contact portion to abut against the inner wall of the center hole of the second rotor disk.

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