A positioning fixture and device for dynamic balancing detection of a hollow shaft rotor

Abstract

The application relates to a positioning clamp and device for dynamic balance detection of a hollow shaft rotor, and relates to the technical field of auxiliary equipment for detecting an oil-cooled motor hollow shaft rotor, and comprises a mounting frame; a clamping mechanism comprising a first clamp unit and a second clamp unit, the first clamp unit and the second clamp unit being slidably arranged on the mounting frame; a bearing core shaft connected with the first clamp unit or the second clamp unit and located between the first clamp unit and the second clamp unit, the bearing core shaft being used for mounting the hollow shaft rotor and enabling the hollow shaft rotor to rotate on the bearing core shaft; and a limiting assembly arranged on the clamping mechanism and used for limiting the position of the hollow shaft rotor on the bearing core shaft. Since the hollow shaft rotor can rotate on the bearing core shaft, the limiting assembly limits the position of the hollow shaft rotor on the bearing core shaft, the hollow shaft rotor can be assembled to a unified position, and the dynamic balance problem of the process shaft itself does not need to be considered.

Description

Technical Field

[0001] This invention relates to the technical field of auxiliary equipment for testing hollow shaft rotors of oil-cooled motors, specifically to a positioning fixture and device for dynamic balance testing of hollow shaft rotors. Background Technology

[0002] During motor manufacturing, dimensional tolerances, uneven insulation, and machining accuracy errors in assembly parts such as rotor laminations can cause rotor center of gravity shifts, resulting in imbalance. Since motors in new energy vehicles operate at high speeds, rotor imbalance at high speeds can cause excessive rotor vibration and noise, directly affecting motor performance and lifespan, and also impacting the driving experience. Rotor dynamic balancing is an essential process in motor manufacturing. A commonly used method for automotive rotor dynamic balancing is the weight reduction method. At a certain speed, an automatic dynamic balancing machine cuts weight off the end plates at both ends of the rotor to measure the dynamic balance. Based on the results, the excess weight on the rotor end plates is removed by drilling, reducing the offset to achieve balance.

[0003] In the existing technology, the rotor shaft of the oil-cooled motor of new energy hybrid vehicles is generally a hollow shaft. For the dynamic balancing process of the hollow shaft rotor, the process shaft is generally inserted into the hollow shaft of the rotor by interference fit, and then clamped on the dynamic balancing machine fixture to perform the dynamic balancing process.

[0004] However, when the process shaft is interference-fitted into the hollow rotor shaft, due to manual operation, it is difficult to install the process shaft in the same position every time. The measured dynamic balance data is unstable and prone to errors, which affects the test results. Summary of the Invention

[0005] This application provides a positioning fixture and device for dynamic balance testing of hollow shaft rotors. It can solve the problem in the prior art that when the process shaft is interference-fitted into the hollow shaft of the rotor, it is difficult to install the process shaft in the same position every time due to manual operation. The measured dynamic balance data is unstable and prone to errors, which affects the test results.

[0006] In a first aspect, embodiments of this application provide a positioning fixture for dynamic balancing testing of a hollow shaft rotor, comprising:

[0007] Mounting rack;

[0008] The clamping mechanism includes a first clamping unit and a second clamping unit, which are slidably disposed on the mounting frame.

[0009] A bearing mandrel is connected to the first clamping unit or the second clamping unit and is located between the first clamping unit and the second clamping unit. The bearing mandrel is used to mount a hollow shaft rotor and to allow the hollow shaft rotor to rotate on the bearing mandrel.

[0010] A limiting component, which is disposed on the clamping mechanism, is used to limit the position of the hollow shaft rotor on the bearing mandrel.

[0011] In conjunction with the first aspect, in one embodiment, the bearing-bearing mandrel includes:

[0012] The mounting shaft includes a mounting section and a fixing section and an abutting section respectively disposed at both ends of the mounting section. The diameters of the fixing section and the abutting section are both smaller than the diameter of the mounting section. The mounting section is used to mount the hollow shaft rotor. The fixing section is connected to the second clamping unit, and the abutting section is used to abut against the first clamping unit.

[0013] Four inner support bearings are respectively arranged in pairs at both ends of the mounting section. The axes of the inner support bearings are located on the same horizontal plane and above the horizontal plane where the axis of the mounting shaft is located. The axial direction of the inner support bearings is the same as that of the mounting shaft. The inner support bearings protrude from the mounting section to support the inner wall of the hollow shaft rotor.

[0014] In conjunction with the first aspect, in one embodiment, the first clamping unit includes:

[0015] A first support base is slidably disposed on the mounting frame for abutting against the abutting section;

[0016] A first drive cylinder is disposed on the mounting bracket and connected to the first support base. The first drive cylinder is used to drive the first support base to move closer to or away from the second clamping unit.

[0017] In conjunction with the first aspect, in one embodiment, the second clamping unit includes:

[0018] The second support is slidably mounted on the mounting bracket and connected to the fixed section;

[0019] A second drive cylinder is disposed on the mounting bracket and connected to the second support base. The second drive cylinder is used to drive the second support base to move closer to or away from the first support base.

[0020] In conjunction with the first aspect, in one embodiment, the limiting component includes two limiting units, which are respectively disposed on the first support base and the second support base. Each limiting unit includes:

[0021] A sliding groove is provided on the first support or the second support, and the sliding direction is the movement direction of the first support or the second support;

[0022] A blocking bearing, which is slidably disposed within the sliding groove, is used to abut against the hollow shaft rotor.

[0023] In conjunction with the first aspect, in one embodiment, the mounting bracket includes a mounting plate and two slide rails disposed on the mounting plate, the two slide rails being spaced apart and slidably connected to the first support base and the second support base.

[0024] In conjunction with the first aspect, in one embodiment, the mounting plate is provided with a through hole located below the bearing spindle, and a lifting seat is provided at the through hole for supporting the hollow shaft rotor.

[0025] In conjunction with the first aspect, in one embodiment, the lifting seat includes:

[0026] Support base for placing the hollow shaft rotor;

[0027] A lifting cylinder, which is connected to the support base, is used to drive the support base to rise or fall.

[0028] In conjunction with the first aspect, in one embodiment, the first support base is provided with a guide structure, and the abutment section is provided with a recessed hole that cooperates with the guide structure.

[0029] Secondly, embodiments of this application provide an apparatus for dynamic balancing detection of hollow shaft rotors, which includes the aforementioned positioning fixture for dynamic balancing detection of hollow shaft rotors.

[0030] The beneficial effects of the technical solutions provided in this application include:

[0031] In manufacturing this positioning fixture for dynamic balancing testing of hollow shaft rotors, a first fixture unit and a second fixture unit are slidably mounted on a mounting frame. A bearing mandrel is connected to either the first or second fixture unit. A limiting component is mounted on the clamping mechanism. When using this positioning fixture for dynamic balancing testing of hollow shaft rotors, the hollow shaft rotor is mounted on the bearing mandrel. The first and second fixture units move relative to each other, connecting them via the bearing mandrel. The limiting component is adjusted to restrict the position of the hollow shaft rotor on the bearing mandrel for dynamic balancing testing. Because the hollow shaft rotor can rotate on the bearing mandrel, and the limiting component restricts its position, the hollow shaft rotor can be assembled to a uniform position without considering the dynamic balancing problem of the process shaft itself. This solves the problem in the prior art where, when the process shaft is interference-fitted into the hollow shaft of the rotor, manual operation makes it difficult to consistently install the process shaft to a uniform position, resulting in unstable dynamic balancing data and potential errors that affect the test results. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a positioning fixture embodiment for dynamic balance testing of a hollow shaft rotor according to the present invention;

[0034] Figure 2 This is a front view schematic diagram of an embodiment of a positioning fixture for dynamic balance testing of a hollow shaft rotor according to the present invention;

[0035] Figure 3 This is a top view schematic diagram of an embodiment of a positioning fixture for dynamic balance testing of a hollow shaft rotor according to the present invention.

[0036] In the diagram: 1. Mounting bracket; 11. Mounting plate; 111. Limiting groove; 12. Slide rail; 2. First clamping unit; 21. First support seat; 211. Guide structure; 22. First drive cylinder; 3. Second clamping unit; 31. Second support seat; 32. Second drive cylinder; 4. Mandrel with bearing; 41. Inner support bearing; 42. Mounting shaft; 421. Mounting section; 422. Fixing section; 423. Abutment section; 5. Limiting assembly; 51. Sliding groove; 52. Blocking bearing; 6. Lifting seat; 61. Third support seat; 62. Lifting cylinder; 7. Sensor assembly; 8. Locking component. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0038] This application provides a positioning fixture and device for dynamic balance testing of hollow shaft rotors. It can solve the problem in the prior art that when the process shaft is interference-fitted into the hollow shaft of the rotor, it is difficult to install the process shaft in the same position every time due to manual operation. The measured dynamic balance data is unstable and prone to errors, which affects the test results.

[0039] like Figure 1 As shown, this application provides a positioning fixture for dynamic balance testing of hollow shaft rotors, comprising:

[0040] Mounting bracket 1;

[0041] The clamping mechanism includes a first clamping unit 2 and a second clamping unit 3, which are slidably mounted on the mounting frame 1.

[0042] A bearing mandrel 4 is connected to the first clamping unit 2 or the second clamping unit 3 and is located between the first clamping unit 2 and the second clamping unit 3. The bearing mandrel 4 is used to mount the hollow shaft rotor and allow the hollow shaft rotor to rotate on the bearing mandrel 4.

[0043] The limiting component 5 is disposed on the clamping mechanism and is used to limit the position of the hollow shaft rotor on the bearing mandrel 4.

[0044] When manufacturing the positioning fixture for dynamic balancing testing of hollow shaft rotors, the first clamping unit 2 and the second clamping unit 3 are slidably mounted on the mounting frame 1. The bearing mandrel 4 is connected to the first clamping unit 2 or the second clamping unit 3. The limiting component 5 is mounted on the clamping mechanism. When using the positioning fixture for dynamic balancing testing of hollow shaft rotors, the hollow shaft rotor is mounted on the bearing mandrel 4. The first clamping unit 2 and the second clamping unit 3 move relative to each other, so that the first clamping unit 2 and the second clamping unit 3 are connected through the bearing mandrel 4. The limiting component 5 is adjusted to limit the position of the hollow shaft rotor on the bearing mandrel 4, and dynamic balancing testing is performed. Since the hollow shaft rotor can rotate on the bearing mandrel 4, and the limiting component 5 restricts the position of the hollow shaft rotor on the bearing mandrel 4, the hollow shaft rotor can be assembled into a uniform position without considering the dynamic balance problem of the process shaft itself. This solves the problem in the prior art where, when the process shaft is interference-fitted into the hollow shaft of the rotor, it is difficult to install the process shaft into a uniform position every time due to manual operation, resulting in unstable dynamic balance data and easy errors that affect the test results.

[0045] In this example, dynamic balancing is performed by pressing down on a belt to rotate the hollow shaft rotor.

[0046] like Figure 2 As shown, in some optional embodiments, the bearing mandrel 4 includes:

[0047] The mounting shaft 42 includes a mounting section 421 and a fixing section 422 and an abutting section 423 respectively disposed at both ends of the mounting section 421. The diameters of the fixing section 422 and the abutting section 423 are both smaller than the diameter of the mounting section 421. The mounting section 421 is used to mount the hollow shaft rotor. The fixing section 422 is connected to the second clamping unit 3. The abutting section 423 is used to abut against the first clamping unit 2.

[0048] Four inner support bearings 41 are respectively set at both ends of the mounting section 421. The axes of the inner support bearings 41 are located on the same horizontal plane and above the horizontal plane where the axis of the mounting shaft 42 is located. The axial direction of the inner support bearings 41 and the mounting shaft 42 is the same. The inner support bearings 41 protrude from the mounting section 421 to support the inner wall of the hollow shaft rotor.

[0049] In this embodiment, the structure of the bearing mandrel 4 is specifically described. The bearing mandrel 4 includes a mounting shaft 42 and four inner support bearings 41. The mounting shaft 42 includes a mounting section 421 and a fixing section 422 and an abutment section 423 respectively disposed at both ends of the mounting section 421. The diameters of the fixing section 422 and the abutment section 423 are both smaller than the diameter of the mounting section 421. The mounting section 421 is used to mount the hollow shaft rotor. The fixing section 422 is connected to the second clamping unit 3. The abutment section 423 is used to abut against the first clamping unit 2. The four inner support bearings 41... The inner support bearings 41 are respectively set at both ends of the mounting section 421. The axis of the inner support bearing 41 is located on the same horizontal plane and above the horizontal plane where the axis of the mounting shaft 42 is located. The axial direction of the inner support bearing 41 is the same as that of the mounting shaft 42. The inner support bearing 41 protrudes from the mounting section 421 and is used to support the inner wall of the hollow shaft rotor. The axial length of the inner support bearing 41 is less than the length of the fixed section 422 and the abutment section 423. By supporting the inner wall of the hollow shaft rotor through the inner support bearing 41, it is convenient for the hollow shaft rotor to rotate, and the measured dynamic balance data is more stable and accurate.

[0050] In this example, the fixed section 422 is detachably connected to the second clamping unit 3, improving applicability.

[0051] like Figure 1 and Figure 2 As shown, in some optional embodiments, the first clamping unit 2 includes:

[0052] The first support 21 is slidably mounted on the mounting frame 1 for abutting against the abutting section 423;

[0053] The first drive cylinder 22 is mounted on the mounting bracket 1 and connected to the first support base 21. The first drive cylinder 22 is used to drive the first support base 21 to move closer to or away from the second clamping unit 3.

[0054] In this embodiment, the structure of the first clamping unit 2 is specifically described. The first clamping unit 2 includes a first support base 21 and a first driving cylinder 22. The first support base 21 is slidably mounted on the mounting frame 1 for abutting against the abutting section 423. The first driving cylinder 22 is mounted on the mounting frame 1 and connected to the first support base 21. The first driving cylinder 22 is used to drive the first support base 21 to move closer to or away from the second clamping unit 3. The structure is simple and easy to implement.

[0055] like Figure 1 and Figure 2 As shown, in some optional embodiments, the second clamping unit 3 includes:

[0056] The second support 31 is slidably mounted on the mounting frame 1 and connected to the fixed section 422;

[0057] The second drive cylinder 32 is mounted on the mounting bracket 1 and connected to the second support 31. The second drive cylinder 32 is used to drive the second support 31 to move closer to or away from the first support 21.

[0058] In this embodiment, the specific structure of the second clamping unit 3 is described. The second clamping unit 3 includes a second support base 31 and a second driving cylinder 32. The second support base 31 is slidably mounted on the mounting frame 1 and connected to the fixed section 422. The second driving cylinder 32 is mounted on the mounting frame 1 and connected to the second support base 31. The second driving cylinder 32 is used to drive the second support base 31 to move closer to or away from the first support base 21. The structure is simple and easy to implement.

[0059] like Figure 1 As shown, in some optional embodiments, the limiting component 5 includes two limiting units, which are respectively disposed on the first support 21 and the second support 31. The limiting unit includes:

[0060] The sliding groove 51 is provided on the first support 21 or the second support 31, and the sliding direction is the movement direction of the first support 21 or the second support 31.

[0061] A blocking bearing 52 is slidably disposed in a sliding groove 51 for abutting against the hollow shaft rotor.

[0062] In this embodiment, the structure of the limiting component 5 is specifically described. The limiting component 5 includes two limiting units, which are respectively disposed on the first support 21 and the second support 31. Each limiting unit includes a sliding groove 51 and a blocking bearing 52. The sliding groove 51 is disposed on the first support 21 or the second support 31, and the sliding direction is the movement direction of the first support 21 or the second support 31. The blocking bearing 52 is slidably disposed in the sliding groove 51 and is used to abut against the hollow shaft rotor. The two blocking bearings 52 abut against both ends of the hollow shaft rotor to limit the displacement of the hollow shaft rotor in the horizontal direction. The measured dynamic balance result is more accurate and stable, and the influence of friction on the measurement result is reduced.

[0063] like Figure 1 and Figure 2 As shown, in some optional embodiments, the mounting bracket 1 includes a mounting plate 11 and two slide rails 12 disposed on the mounting plate 11. The two slide rails 12 are spaced apart and are slidably connected to the first support base 21 and the second support base 31.

[0064] In this embodiment, the specific structure of the mounting bracket 1 is described. The mounting bracket 1 includes a mounting plate 11 and two slide rails 12. The two slide rails 12 are spaced apart on the mounting plate 11, and the direction of the slide rails 12 is the same as the sliding direction of the first support 21 and the second support 31. The first support 21 and the second support 31 are slidably mounted on the slide rails 12. The structure is simple and easy to implement.

[0065] like Figure 3 As shown, in this example, the mounting plate 11 is provided with a limiting groove 111, and the first support 21 and the second support 31 are both provided with limiting parts. The limiting parts slide in the limiting groove 111 to conveniently limit the extreme positions of the first support 21 and the second support 31. The limiting parts are provided with locking parts 8 to fix the positions of the first support 21 and the second support 31.

[0066] like Figure 1 As shown, in some optional embodiments, the mounting plate 11 is provided with a through hole located below the bearing spindle 4, and a lifting seat 6 is provided at the through hole to support the hollow shaft rotor.

[0067] In this embodiment, a through hole is provided on the mounting plate 11, located below the bearing mandrel 4. A lifting seat 6 is provided at the through hole, which supports the hollow shaft rotor. When using the positioning fixture for dynamic balancing testing of the hollow shaft rotor, the first drive cylinder 22 and the second drive cylinder 32 respectively drive the first support seat 21 and the second support seat 31 to move away from each other to their extreme positions. The lifting seat 6 rises, extends out of the mounting plate 11 from the through hole, and places the hollow shaft rotor on the lifting seat 6, with the splined end of the hollow shaft rotor facing the first support seat 21. A support seat 21 is positioned with its non-splined end facing the second support seat 31. At this time, the first drive cylinder 22 and the second drive cylinder 32 drive the first support seat 21 and the second support seat 31 to move closer to each other, so that the bearing spindle 4 passes through the inner hole of the hollow shaft rotor and the abutting section 423 abuts against the first support seat 21. The position of the blocking bearing 52 in the sliding groove 51 is adjusted so that the two blocking bearings 52 abut against both ends of the hollow shaft rotor. The lifting seat 6 is lowered to conduct a dynamic balance test, making the installation of the hollow shaft rotor more stable and safer.

[0068] In this example, the mounting bracket 1 is also equipped with a sensor assembly 7, which is used to detect whether there is a hollow shaft rotor on the lifting seat 6 and to measure the rotational speed of the hollow shaft rotor.

[0069] like Figure 1 As shown, in some optional embodiments, the lifting seat 6 includes:

[0070] The third support 61 is used to hold the hollow shaft rotor;

[0071] The lifting cylinder 62 is connected to the third support 61 and is used to drive the third support 61 to rise or fall.

[0072] In this embodiment, the structure of the lifting seat 6 is specifically described. The lifting seat 6 includes a third support seat 61 and a lifting cylinder 62. The third support seat 61 is used to place the hollow shaft rotor. The lifting cylinder 62 is connected to the third support seat 61 and is used to drive the third support seat 61 to rise or fall. The structure is simple, reliable and easy to implement.

[0073] In this example, the contact surface between the third support 61 and the hollow shaft rotor is made of nylon.

[0074] like Figure 1 and Figure 2 As shown, in some optional embodiments, the first support 21 is provided with a guide structure 211, and the abutment section 423 is provided with a concave hole that cooperates with the guide structure 211.

[0075] In this embodiment, a guide structure 211 is provided on the first support 21, and a recessed hole that cooperates with the guide structure 211 is provided on the abutment section 423. When the first support 21 and the second support 31 are close to each other, it is convenient for the bearing mandrel 4 to abut against the first support 21, making the positioning fixture for dynamic balance testing of hollow shaft rotor more stable and reliable when in use.

[0076] like Figure 1 As shown, on the other hand, this application also provides an apparatus for dynamic balance testing of hollow shaft rotors, which includes the above-mentioned positioning fixture for dynamic balance testing of hollow shaft rotors.

[0077] In manufacturing the device for dynamic balancing testing of hollow shaft rotors, the first clamping unit 2 and the second clamping unit 3 are slidably mounted on the mounting frame 1. The bearing mandrel 4 is connected to the first clamping unit 2 or the second clamping unit 3. The limiting component 5 is mounted on the clamping mechanism. When using the device for dynamic balancing testing of hollow shaft rotors, the hollow shaft rotor is mounted on the bearing mandrel 4. The first clamping unit 2 and the second clamping unit 3 move relative to each other, so that the first clamping unit 2 and the second clamping unit 3 are connected through the bearing mandrel 4. The limiting component 5 is adjusted to limit the position of the hollow shaft rotor on the bearing mandrel 4, and dynamic balancing testing is performed. Since the hollow shaft rotor can rotate on the bearing mandrel 4, and the limiting component 5 restricts the position of the hollow shaft rotor on the bearing mandrel 4, the hollow shaft rotor can be assembled into a uniform position without considering the dynamic balance problem of the process shaft itself. This solves the problem in the prior art where, when the process shaft is interference-fitted into the hollow shaft of the rotor, it is difficult to install the process shaft into a uniform position every time due to manual operation, resulting in unstable dynamic balance data and easy errors that affect the test results.

[0078] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0079] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0080] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A positioning fixture for dynamic balancing testing of hollow shaft rotors, characterized in that, include: Mounting bracket (1); The clamping mechanism includes a first clamping unit (2) and a second clamping unit (3), which are slidably disposed on the mounting bracket (1). A bearing mandrel (4) is connected to the first clamp unit (2) or the second clamp unit (3) and is located between the first clamp unit (2) and the second clamp unit (3). The bearing mandrel (4) is used to mount a hollow shaft rotor and to allow the hollow shaft rotor to rotate on the bearing mandrel (4). A limiting component (5) is provided on the clamping mechanism to limit the position of the hollow shaft rotor on the bearing mandrel (4); The bearing mandrel (4) includes: The mounting shaft (42) includes a mounting section (421) and a fixing section (422) and an abutment section (423) respectively disposed at both ends of the mounting section (421). The diameters of the fixing section (422) and the abutment section (423) are both smaller than the diameter of the mounting section (421). The mounting section (421) is used to mount the hollow shaft rotor. The fixing section (422) is connected to the second clamping unit (3). The abutment section (423) is used to abut against the first clamping unit (2). Four inner support bearings (41) are respectively arranged at both ends of the mounting section (421). The axes of the inner support bearings (41) are located on the same horizontal plane and above the horizontal plane where the axis of the mounting shaft (42) is located. The axial direction of the inner support bearings (41) is the same as that of the mounting shaft (42). The inner support bearings (41) protrude from the mounting section (421) to support the inner wall of the hollow shaft rotor.

2. A positioning fixture for dynamic balance testing of a hollow shaft rotor as described in claim 1, characterized in that, The first clamping unit (2) includes: The first support (21) is slidably disposed on the mounting bracket (1) for abutting against the abutting section (423); A first drive cylinder (22) is mounted on the mounting bracket (1) and connected to the first support base (21). The first drive cylinder (22) is used to drive the first support base (21) to move closer to or away from the second clamping unit (3).

3. A positioning fixture for dynamic balancing testing of a hollow shaft rotor as described in claim 2, characterized in that, The second clamping unit (3) includes: The second support (31) is slidably disposed on the mounting bracket (1) and connected to the fixed section (422); The second drive cylinder (32) is disposed on the mounting bracket (1) and connected to the second support (31). The second drive cylinder (32) is used to drive the second support (31) to move closer to or away from the first support (21).

4. A positioning fixture for dynamic balance testing of a hollow shaft rotor as described in claim 3, characterized in that, The limiting component (5) includes two limiting units, which are respectively disposed on the first support base (21) and the second support base (31). The limiting unit includes: The sliding groove (51) is provided on both the first support base (21) and the second support base (31), and the extension direction of the sliding groove (51) is the movement direction of the respective support base. A blocking bearing (52), which is slidably disposed in the sliding groove (51), is used to abut against the hollow shaft rotor.

5. A positioning fixture for dynamic balance testing of a hollow shaft rotor as described in claim 3, characterized in that, The mounting bracket (1) includes a mounting plate (11) and two slide rails (12) disposed on the mounting plate (11). The two slide rails (12) are spaced apart and are slidably connected to the first support base (21) and the second support base (31).

6. A positioning fixture for dynamic balance testing of a hollow shaft rotor as described in claim 5, characterized in that, The mounting plate (11) is provided with a through hole, which is located below the bearing spindle (4). A lifting seat (6) is provided at the through hole, which is used to support the hollow shaft rotor.

7. A positioning fixture for dynamic balance testing of a hollow shaft rotor as described in claim 6, characterized in that, The lifting platform (6) includes: The third support (61) is used to place the hollow shaft rotor; A lifting cylinder (62) is connected to the third support (61) and is used to drive the third support (61) to rise or fall.

8. A positioning fixture for dynamic balance testing of a hollow shaft rotor as described in claim 2, characterized in that, The first support base (21) is provided with a guide structure (211), and the abutting section (423) is provided with a concave hole that cooperates with the guide structure (211).

9. A device for dynamic balancing testing of hollow shaft rotors, characterized in that, Including a positioning fixture for dynamic balance testing of hollow shaft rotors as described in any one of claims 1-8.

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