Dynamic balance method and system for turbine of air turbine starter

Abstract

The invention belongs to the technical field of air turbine starters, and provides an air turbine starter turbine dynamic balance method which adopts a dynamic balance system simulating an air turbine starter shell to carry out dynamic balance on a turbine rotor system. And then a special angular contact ball bearing is adopted to dismount the turbine rotor by the dismounting tool under the condition that the turbine rotor is not damaged. The installation positioning cylinder simulates and replaces a starter shell of the air turbine starter, and dynamic balance can be carried out on a turbine rotor system of the air turbine starter in a real state. And the rotor can be dynamically balanced on the existing horizontal dynamic balancing machine by being connected with the dynamic balancing bracket. The installation positioning cylinder and the dynamic balance support are designed in a split mode, and installation and disassembly of the turbine rotor system of the air turbine starter are facilitated. The axial movement of the rear bearing is limited through the bearing baffle, and the situation that the rear bearing is ejected and flies out under the pretightening force effect of the spring when the rear bearing is separated from the turbine shaft is avoided. The two-half type dismounting pressing seat is used for replacing a traditional puller to dismount the bearing which is in interference fit with the turbine shaft, and damage to the surface of the turbine shaft can be greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of air turbine starters, and relates to a system device used for dynamic balancing of an air turbine starter, and specifically to a method and system for dynamic balancing a turbine of an air turbine starter. Background Art

[0002] Air turbine starters are used for ground starting, cold running, oil sealing, unsealing, false starting and air auxiliary starting of aircraft engines. The turbine is the core component of the air turbine starter to achieve energy conversion. Its operating conditions are complex and the operating speed is high. Once it fails, it usually causes functional failure of the starter and even safety hazards. It is a key and important part of the air turbine starter.

[0003] The unbalance of the turbine rotor of the air turbine starter is one of the important factors that cause the vibration of the air turbine starter rotor to rub against the wall and the bearing failure. Therefore, the turbine rotor needs to be dynamically balanced during the assembly process to control the unbalance of the rotor within an acceptable range.

[0004] like Figure 1 The schematic diagram of a typical high-reaction air turbine starter turbine rotor system is shown. The turbine rotor is a disc-shaft integrated structure, fixed to the starter housing by a double-point cantilever support. The front bearing and rear bearing used for support are both angular contact ball bearings, fixed to the turbine shaft of the turbine rotor by interference fit, and the front bearing and rear bearing provide preload force through springs. The front bearing and the turbine rotor are axially connected through a cover plate, the front bearing and the rear bearing are connected through a sleeve bearing, the sun gear is connected to the turbine rotor through a spline for transmitting torque, and is axially connected to the rear bearing, and is fixed to the turbine rotor through a locking nut, a cover plate, a front bearing, a sleeve, a rear bearing and a sun gear to form a turbine rotor system. Since the entire air turbine starter turbine rotor system rotates at the same speed and high speed, it is necessary to dynamically balance the imbalance of the entire turbine rotor system.

[0005] The traditional air turbine starter turbine dynamic balancing is performed by fixing the turbine rotor on a horizontal dynamic balancing machine using a pair of process deep groove ball bearings. This traditional method has several problems. First, the support stiffness of the process deep groove ball bearings used is quite different from that of the angular contact bearings actually used, and cannot be effectively simulated. In addition, as the number of uses increases, the process bearings will have greater wear, resulting in inaccurate dynamic balancing results; second, the low imbalance of the turbine rotor does not mean that the imbalance of the entire turbine rotor system is low; third, because the two bearings are interference-connected with the turbine shaft, the traditional method of disassembling the process deep groove ball bearings is to pull the bearings out with a puller, which will cause large scratches on the turbine shaft surface.

[0006] In summary, there is an urgent need for an air turbine starter turbine rotor dynamic balancing system that can dynamically balance the turbine rotor system by simulating the actual installed state of the air turbine starter as much as possible while minimizing the impact on the turbine rotor. Summary of the invention

[0007] In order to solve the above problems, the present invention provides an air turbine starter turbine dynamic balancing method and system, which can realize dynamic balancing of the air turbine starter turbine rotor system on a horizontal dynamic balancing machine, simulate the actual installation state of the air turbine starter as much as possible; and can minimize the impact on the turbine bearing of the turbine rotor when disassembling the support bearing.

[0008] The technical solution of the present invention is as follows:

[0009] The invention discloses a method for dynamically balancing a turbine of an air turbine starter. The method adopts a dynamic balancing system simulating an air turbine starter housing to dynamically balance a turbine rotor system. Then, a special angular contact ball bearing is used to dismantle the turbine rotor without damaging the turbine rotor using a disassembly tool.

[0010] Further, the method specifically includes the following steps:

[0011] S1: Install the turbine rotor system of the air turbine starter as a whole in the positioning cylinder of the dynamic balancing system, the turbine rotor system including a front bearing, a rear bearing, a turbine rotor, a spring, a cover plate, a sleeve, a sun gear and a locking nut;

[0012] S2: Install the positioning cylinder of the installed turbine rotor system on the dynamic balancing support frame of the dynamic balancing system, and then fix it on the horizontal dynamic balancing machine, blow the turbine blades to reach the target speed, and dynamically balance the turbine rotor;

[0013] S3: Remove the installation positioning cylinder from the dynamic balancing support frame, disassemble the sun gear and the locking nut of the turbine rotor system, and then connect the installation positioning cylinder with the air turbine starter turbine rotor system angular contact ball bearing disassembly tool of the air turbine starter turbine dynamic balancing system;

[0014] S4: Use the air turbine starter turbine rotor system angular contact ball bearing disassembly tool. The disassembly tool has a disassembly press seat. The parallelism of the two end faces of the disassembly press seat ensures that the turbine rotor and the end face of the press sleeve are sufficiently vertical. The cover plate is supported by the disassembly press seat, and then the front bearing, rear bearing, cover plate and sleeve on the turbine rotor are removed by pushing the turbine rotor.

[0015] An air turbine starter turbine dynamic balancing system, used in the above-mentioned air turbine starter turbine dynamic balancing method, includes a dynamic balancing device used in S1 to S2, the dynamic balancing device specifically includes an installation positioning cylinder, a dynamic balancing bracket and a first fastening bolt, the installation positioning cylinder has a through hole at the center for loading the turbine rotor system, one side of the through hole has a relatively large opening, the large opening is used to fix the front bearing close to the turbine rotor, and the other side of the through hole has a small opening, the small opening is used to install a spring and provide radial positioning for the rear bearing; the installation positioning cylinder is detachably mounted on the dynamic balancing bracket by the first fastening bolt.

[0016] Furthermore, the dynamic balancing support frame is provided with weight-reducing holes to reduce the influence of the tooling on the dynamic balancing result; and the bottom of the dynamic balancing support frame is provided with a mounting hole connected to the horizontal dynamic balancing machine.

[0017] Furthermore, it also includes an angular contact ball bearing disassembly tool for the turbine rotor system of the air turbine starter used in S3 to S4, including a bearing baffle, a disassembly seat and a base; the bearing baffle limits the axial movement of the inner ring of the rear bearing; the disassembly seat is a two-half structure, and the two end faces of the disassembly seat are perpendicular to the axial direction of the turbine rotor; the base is arranged under the disassembly seat to support the disassembly seat, and the base has sufficient space for pressing out the turbine rotor.

[0018] Furthermore, two open fastening seats are arranged on the combined end surface of the two halves of the disassembly pressing seat, and the two halves of the disassembly pressing seat can be quickly assembled and disassembled through the two open fastening seats.

[0019] Furthermore, the outer ring of the bearing baffle is provided with a thread, which cooperates with the installation positioning tube to axially fix the rear bearing; the bearing baffle is provided with a manual rotating rib plate, which can be manually screwed in and out without the aid of provided tools.

[0020] Furthermore, the bottom of the base is made of a soft non-metallic material to prevent the turbine rotor from falling onto the base and being bumped and scratched when being pressed out.

[0021] The gain effect of the present invention is:

[0022] By simulating the starter housing of the air turbine starter through the installation positioning cylinder, the turbine rotor system of the air turbine starter in a real state can be dynamically balanced. By connecting with the dynamic balancing bracket, the rotor dynamic balancing can be performed on an existing horizontal dynamic balancing machine. The installation positioning cylinder and the dynamic balancing bracket are designed to be separate, which is convenient for the installation and disassembly of the turbine rotor system of the air turbine starter. The axial movement of the rear bearing is limited by the bearing baffle to prevent the rear bearing from being ejected under the action of the spring preload when it is separated from the turbine shaft. The two-half disassembly pressure seat is used to replace the traditional puller to disassemble the bearing that is interference-fitted with the turbine shaft, which can greatly reduce the damage to the surface of the turbine shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the implementation method of the patent of the present invention, the following is a brief introduction to the drawings required for use in the implementation method. It should be understood that the following drawings only show certain embodiments of the patent of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a typical high-reaction air turbine starter turbine rotor system schematic diagram;

[0025] Figure 2 It is a top view of a dynamic balancing tool for a turbine rotor system of an air turbine starter provided by the present invention;

[0026] Figure 3 It is a cross-sectional schematic diagram of a dynamic balancing tool for a turbine rotor system of an air turbine starter provided by the present invention;

[0027] Figure 4 This is an appearance diagram of a disassembly tool for a turbine rotor system of an air turbine starter provided by the present invention;

[0028] Figure 5 The present invention is a schematic cross-sectional view of a disassembly tool for a turbine rotor system of an air turbine starter.

[0029] Among them: 1-turbine rotor; 2-baffle; 3-starter housing; 4-front bearing; 5-spacer; 6-spring; 7-rear bearing; 8-sun gear; 9-locking nut; 10-installation positioning cylinder; 11-dynamic balancing bracket; 12-first fastening bolt; 13-first gasket; 14-bearing baffle; 15-disassembly seat; 16-base; 17-second fastening bolt; 18-nut; 19-second gasket. DETAILED DESCRIPTION

[0030] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships as given in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or a point connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0033] Embodiment 1:

[0034] The invention discloses a method for dynamically balancing a turbine of an air turbine starter. The method adopts a dynamic balancing system simulating an air turbine starter housing to dynamically balance a turbine rotor system. Then, a special angular contact ball bearing is used to dismantle the turbine rotor without damaging the turbine rotor using a disassembly tool.

[0035] The specific steps include:

[0036] S1: The turbine rotor system of the air turbine starter is installed as a whole in the positioning cylinder of the dynamic balancing system, wherein the turbine rotor system includes a front bearing 4, a rear bearing 7, a turbine rotor 1, a spring 6, a cover plate 2, a sleeve 5, a sun gear 8 and a locking nut 9;

[0037] S2: Install the positioning cylinder of the installed turbine rotor system on the dynamic balancing support frame of the dynamic balancing system, and then fix it on the horizontal dynamic balancing machine, blow the turbine blades to reach the target speed, and dynamically balance the turbine rotor;

[0038] S3: Remove the installation positioning cylinder from the dynamic balancing support frame, disassemble the sun gear 8 and the locking nut 9 of the turbine rotor system, and then connect the installation positioning cylinder with the air turbine starter turbine rotor system angular contact ball bearing disassembly tool of the air turbine starter turbine dynamic balancing system;

[0039] S4: Use the air turbine starter turbine rotor system angular contact ball bearing disassembly tool, the disassembly tool has a disassembly press seat, the parallelism of the two end faces of the disassembly press seat ensures that the turbine rotor and the end face of the press sleeve are sufficiently perpendicular, and the cover plate 2 is supported by the disassembly press seat, and then the front bearing 4, rear bearing 7, cover plate 2 and sleeve 5 on the turbine rotor 1 are removed by pushing the turbine rotor 1.

[0040] An air turbine starter turbine dynamic balancing system is used in the above-mentioned air turbine starter turbine dynamic balancing method, including a dynamic balancing device used in S1 to S2, the dynamic balancing device specifically including an installation positioning cylinder 10, a dynamic balancing bracket 11 and a first fastening bolt 12, the installation positioning cylinder 10 has a through hole at the center for loading the turbine rotor system, one side of the through hole has a relatively large opening, the large opening is used to fix the front bearing 4 close to the turbine rotor 1, and the other side of the through hole has a small opening, the small opening is used to install the spring 6 and provide radial positioning for the rear bearing 7; the installation positioning cylinder 10 is detachably mounted on the dynamic balancing bracket 11 by the first fastening bolt 12.

[0041] The dynamic balancing support frame 11 is provided with weight-reducing holes to reduce the influence of the tooling on the dynamic balancing result; the bottom of the dynamic balancing support frame 11 is provided with a mounting hole connected to a horizontal dynamic balancing machine.

[0042] It also includes an angular contact ball bearing disassembly tool for the turbine rotor system of the air turbine starter used in S3 to S4, including a bearing baffle 14, a disassembly seat 15 and a base 16; the bearing baffle 14 limits the axial movement of the inner ring of the rear bearing 7; the disassembly seat 15 is a two-half structure, and the two end faces of the disassembly seat 15 are perpendicular to the axial direction of the turbine rotor 1; the base 16 is arranged below the disassembly seat 15 to support the disassembly seat 15, and the base 16 has sufficient space for pressing out the turbine rotor 1.

[0043] Two open fastening seats are arranged on the combined end surface of the two half disassembly pressing seats 15, and the two half disassembly pressing seats 15 can be quickly assembled and disassembled through the two open fastening seats.

[0044] The outer ring of the bearing baffle 14 is provided with threads, which cooperate with the installation positioning tube 10 to axially fix the rear bearing; the bearing baffle 14 is provided with manual rotating ribs, which can be manually screwed in and out without the help of provided tools.

[0045] The bottom of the base 16 is made of a soft non-metal material to prevent the turbine rotor 1 from falling on the base and being bumped and scratched when being pressed out.

[0046] Embodiment 2:

[0047] Figure 2 A top view showing the implementation status of the dynamic balancing tooling of the turbine rotor system of the air turbine starter is shown. Figure 3 It is a cross-sectional view of the length direction of the dynamic balancing tooling of the turbine rotor system of the air turbine starter and a cross-sectional view of the diameter direction of the installation positioning cylinder. Figure 4 The front view of the air turbine starter turbine rotor system disassembly tooling implementation state is shown. Figure 5 It is a cross-sectional schematic diagram and a top view along the axial direction.

[0048] Please combine Figure 2 and Figure 3 The dynamic balancing tooling of the turbine rotor system of the air turbine starter includes an installation positioning cylinder 10, a dynamic balancing bracket 11, a first fastening bolt 12 and a first gasket 13. The installation positioning cylinder 10 has two open ports as shown in the figure, the larger opening on one side is the front opening, which is used to fix the front bearing 4 close to the turbine rotor 1, and the smaller opening on the other side is the rear opening, which is used to install the spring 6 and provide radial positioning for the rear bearing 7.

[0049] Among them, the installation positioning cylinder 10 and the dynamic balancing bracket 11 adopt a split design, which is convenient for the installation and disassembly of the air turbine starter turbine rotor system. In order to reduce the influence of the dynamic balancing tooling on the dynamic balancing result, the dynamic balancing tooling mass is required to be as light as possible, so the tooling size is as small as possible. The present invention arranges a matching groove surface and a bolt connection table surface on the wall of the installation positioning cylinder 10, and ensures the fastening stability with the dynamic balancing support frame 11 on a reduced size.

[0050] The specific implementation method of the dynamic balancing of the turbine rotor system of the air turbine starter is as follows: install the front bearing 4 into the installation positioning cylinder 10; insert the baffle 2 into the turbine shaft of the turbine rotor 1 to the shaft shoulder; press the assembly formed by the turbine rotor 1 and the baffle 2 into the front bearing 4 until the front bearing 4 contacts the baffle 2; insert the spacer 5 into the turbine shaft of the turbine rotor 1 to contact the inner ring of the front bearing 4; put the spring 6 into the installation positioning cylinder 10 and open it until it contacts the end face; insert the rear bearing 7 into the turbine shaft of the turbine rotor 1 and press it until the inner ring of the rear bearing 7 contacts the spacer 5; install the sun gear 8 on the turbine shaft of the turbine rotor 1 until it contacts the inner ring of the rear bearing 7; The tightening nut 9 is screwed into the turbine shaft of the turbine rotor 1 and locked; the above-mentioned assembly including the installation positioning cylinder 10 and the air turbine starter turbine rotor system is placed in the groove of the dynamic balancing bracket 11 and aligned with the threaded hole; after the gasket 12 is inserted into the fastening bolt 13, the fastening bolt 13 is screwed into the threaded hole to connect and tighten the installation positioning cylinder 10 and the dynamic balancing bracket 11; the dynamic balancing bracket base 11 is connected and tightened to the horizontal dynamic balancing machine; compressed air is used to blow the turbine blades to reach the target speed, the turbine rotor is dynamically balanced, and the residual imbalance of the air turbine starter turbine rotor system is reduced to an acceptable level.

[0051] Please combine Figure 4 and Figure 5The air turbine starter turbine rotor system disassembly tool includes a bearing baffle 14, a disassembly press seat 15, a base 16, a second fastening bolt 17, a nut 18 and a second gasket 19. Among them, the outer ring of the bearing baffle 14 is provided with an external thread, which is screwed into the inner thread at the rear opening of the installation positioning cylinder 11 to limit the axial movement of the inner ring of the rear bearing 7, and prevent the rear bearing 7 from being ejected under the preload of the spring 6 when the turbine shaft of the turbine rotor 1 is separated. A manual rotating rib is provided on the bearing baffle 14, which can be manually screwed in and out of the installation positioning cylinder 11 without the help of a tool.

[0052] Among them, Figure 5 The disassembly pressing seat 15 shown needs two to be used together, connected into a whole by the second fastening bolt 17, nut 18 and second gasket 19, and supports the baffle 2 to press the turbine out. Two open fastening seats are arranged on the end surface of the disassembly pressing sleeve 15, which is convenient for the installation and removal of the fastening bolts, gaskets and nuts, and further facilitates the assembly and disassembly of the two disassembly pressing sleeves.

[0053] The base supports the disassembly sleeve and provides enough space for the turbine rotor to be pressed out. The bottom of the base is made of soft non-metallic material to prevent the turbine rotor from falling on the base and being bumped and scratched when being pressed out.

[0054] The specific implementation method of disassembling the turbine rotor system of the air turbine starter after dynamic balancing is as follows: remove the locking nut 9 and the sun gear 8; screw the bearing baffle 14 from the internal thread of the rear opening of the installation positioning cylinder 10 to the connection with the rear bearing 7; insert the two disassembly press seats 15 into the outer edge of the shaft shoulder of the turbine rotor 1 respectively, and contact the end face of the baffle 2; after ensuring that the two disassembly press seats 15 are fully in contact with the baffle 2, the two disassembly press seats 15 are fastened together by the second fastening bolts 17, nuts 18 and second gaskets 19, and then placed on the base 16. Press the turbine rotor 1 downward by a press machine and a press rod smaller than the turbine shaft diameter of the turbine rotor 1 until the turbine rotor 1 is separated from the front bearing and the rear bearing, and the turbine rotor 1 falls onto the base 16; take out the baffle 2, the front bearing 4, the spacer 5 and the installation positioning cylinder 10, screw out the bearing baffle 14 on the installation positioning cylinder 10, take out the rear bearing 7 and the spring 6, and the disassembly of the turbine rotor system of the air turbine starter is completed.

[0055] The above is only a specific embodiment of the present invention, and the present invention is described in detail. The unexplained part is a conventional technology. However, the protection scope of the present invention is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for dynamic balancing of a turbine of an air turbine starter, characterized in that: The turbine rotor system is dynamically balanced using a dynamic balancing system that simulates the air turbine starter housing, and then the turbine rotor is removed using a special angular contact ball bearing disassembly tool without damaging the turbine rotor.

2. The method for dynamic balancing of an air turbine starter according to claim 1, characterized in that: The specific steps include: S1: The turbine rotor system of the air turbine starter is installed as a whole in the positioning cylinder of the dynamic balancing system, wherein the turbine rotor system comprises a front bearing (4), a rear bearing (7), a turbine rotor (1), a spring (6), a cover plate (2), a sleeve (5), a sun gear (8) and a locking nut (9); S2: Install the positioning cylinder of the installed turbine rotor system on the dynamic balancing support frame of the dynamic balancing system, and then fix it on the horizontal dynamic balancing machine, blow the turbine blades to reach the target speed, and dynamically balance the turbine rotor; S3: Remove the installation positioning cylinder from the dynamic balancing support frame, disassemble the sun gear (8) and the locking nut (9) of the turbine rotor system, and then connect the installation positioning cylinder to the air turbine starter turbine rotor system angular contact ball bearing disassembly tool of the air turbine starter turbine dynamic balancing system; S4: Use the angular contact ball bearing disassembly tool of the turbine rotor system of the air turbine starter. The disassembly tool has a disassembly press seat. The parallelism of the two end faces of the disassembly press seat ensures that the turbine rotor and the end face of the press sleeve are sufficiently perpendicular. The cover plate (2) is supported by the disassembly press seat, and then the front bearing (4), the rear bearing (7), the cover plate (2) and the sleeve (5) on the turbine rotor (1) are removed by pushing the turbine rotor (1).

3. An air turbine starter turbine dynamic balancing system, used in an air turbine starter turbine dynamic balancing method as claimed in claim 2, characterized in that: The invention comprises a dynamic balancing device used in S1 to S2, wherein the dynamic balancing device specifically comprises an installation positioning cylinder (10), a dynamic balancing bracket (11) and a first fastening bolt (12); the installation positioning cylinder (10) has a through hole at its center for inserting a turbine rotor system, one side of the through hole has a relatively large opening, the large opening is used for fixing a front bearing (4) close to the turbine rotor (1), and the other side of the through hole has a small opening, the small opening is used for installing a spring (6) and providing radial positioning for a rear bearing (7); the installation positioning cylinder (10) is detachably installed on the dynamic balancing bracket (11) via the first fastening bolt (12).

4. The air turbine starter turbine dynamic balancing system according to claim 3, characterized in that: The dynamic balancing support frame (11) is provided with weight-reducing holes to reduce the influence of tooling on the dynamic balancing result; and the bottom of the dynamic balancing support frame (11) is provided with a mounting hole connected to a horizontal dynamic balancing machine.

5. The air turbine starter turbine dynamic balancing system according to claim 3, characterized in that: It also includes an angular contact ball bearing disassembly tool for the turbine rotor system of the air turbine starter used in S3 to S4, including a bearing baffle (14), a disassembly seat (15) and a base (16); the bearing baffle (14) limits the axial movement of the inner ring of the rear bearing (7); the disassembly seat (15) is a two-half structure, and the two end faces of the disassembly seat (15) are perpendicular to the axial direction of the turbine rotor (1); the base (16) is arranged below the disassembly seat (15) to support the disassembly seat (15), and the base (16) has sufficient space for pressing out the turbine rotor (1).

6. The air turbine starter turbine dynamic balancing system according to claim 5, characterized in that: Two open fastening seats are arranged on the combined end faces of the two half disassembly pressing seats (15), and the two half disassembly pressing seats (15) are quickly assembled and disassembled through the two open fastening seats.

7. The air turbine starter turbine dynamic balancing system according to claim 5, characterized in that: The outer ring of the bearing baffle (14) is provided with a thread, which cooperates with the installation positioning cylinder (10) to axially fix the rear bearing; the bearing baffle (14) is provided with a manual rotating rib plate, which can be manually screwed in and out without the aid of provided tools.

8. The air turbine starter turbine dynamic balancing system according to claim 5, characterized in that: The bottom of the base (16) is made of soft non-metallic material.

Images