A spindle bearing clearance measuring device and installation measurement method thereof

Abstract

The present application discloses a spindle bearing clearance measuring device and its installation and measurement method. The spindle bearing includes: a rear main bearing and a front main bearing, which are arranged in a bearing seat. The clearance measuring device includes: a displacement measuring sensor and a counterweight adjustment assembly. The displacement measuring sensor is used to measure the clearance of the spindle bearing. The displacement measuring sensor is arranged facing the large end face of the inner ring of the front main bearing. The counterweight adjustment assembly is used to level the bearing seat. The above structure can detect whether the negative clearance of the spindle bearing installation meets the technical requirements, ensure that the clearance of the spindle bearing during final assembly meets the design requirements, improve the safety and reliability of the spindle bearing application, monitor the deformation of the rear main bearing during the installation process of the spindle bearing through the displacement measuring sensor, and the counterweight adjustment assembly can level the bearing seat, which can make the data obtained by the displacement measuring sensor more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of main shaft bearing installation of a wind turbine generator set, and more particularly to a main shaft bearing clearance measuring device and an installation and measuring method thereof. Background Art

[0002] In a wind turbine, the main transmission chain is the core part of the wind turbine. Its performance directly affects the overall cost of the wind turbine, the reliability of the unit's operation and its market competitiveness. The main shaft bearing is the core component of the main transmission chain. Currently, there are three types of main shaft bearings for large wind turbines. The first type is double-row spherical roller bearings. These bearings cannot offset the effects of the combined bending moment at the hub center on the gearbox, resulting in moment loads on the front bearing of the first-stage turret of the gearbox, making the gearbox operate in poor conditions. The second type is double-row tapered roller bearings or three-row cylindrical roller bearings. These bearings compactly integrate the main shaft bearings with the gearbox, but their large size makes them difficult to transport and uneconomical. Furthermore, these bearings are oil-lubricated, which can lead to poor lubrication during long standby or transportation periods, resulting in wear and failure. The third type is two sets of single-row tapered roller bearings. These bearings are greased, avoiding the oil starvation problem associated with oil lubrication. Furthermore, the dual main bearings can overcome the effects of the hub center bending moment, improving turbine reliability. Therefore, large-megawatt turbines often use two sets of double-row tapered roller bearings for their main shaft bearings.

[0003] In order to improve the reliability of the two sets of single-row tapered roller bearings and ensure the rigidity of the bearings, the two sets of tapered roller bearings need to be preloaded. The amount of bearing preload will affect the life and reliability of the bearings. Too little preload will not meet the use requirements of the bearings and may easily cause problems such as the edge collapse of the bearing inner ring rib; too much preload will make it difficult to lubricate the bearings, increase the bearing load, and cause problems such as bearing overheating. Therefore, it is necessary to measure the preload of the bearings to ensure that the bearing installation meets the technical requirements. However, the existing technology is difficult to detect the amount of bearing preload, making it difficult to assess the safety of the spindle bearings during the entire hot installation process.

[0004] In summary, how to provide a device that can accurately measure the preload amount of the spindle bearing is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a clearance measuring device for a spindle bearing and an installation measurement method thereof, which can monitor the maximum preload force of the bearing during the installation of the spindle bearing and evaluate the safety of the bearing during the entire hot installation process.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A clearance measuring device for a spindle bearing, the spindle bearing comprising: a rear main bearing and a front main bearing, the rear main bearing and the front main bearing being arranged in a bearing seat, characterized in that the clearance measuring device comprises a displacement measuring sensor and a counterweight adjustment assembly, the displacement measuring sensor being used to measure the clearance of the spindle bearing, the displacement measuring sensor being arranged facing the large end face of the inner ring of the front main bearing, and the counterweight adjustment assembly being used to level the bearing seat.

[0008] A device for measuring the clearance of a spindle bearing, wherein the displacement measuring sensor is arranged on a fixed bracket, one end of the fixed bracket is arranged on the end surface of the bearing seat, and the other end of the fixed bracket is provided with the displacement measuring sensor.

[0009] A device for measuring the clearance of a spindle bearing, wherein the counterweight adjustment component is radially arranged on the bearing seat, and the counterweight adjustment component includes an adjusting screw, and the adjusting screw is used to adjust the center of gravity distance of the counterweight adjustment component.

[0010] A clearance measuring device for a spindle bearing, wherein the counterweight adjustment assembly further comprises a support rod for providing support, one end of the support rod is arranged on the bearing seat, and the other end of the support rod is arranged on the counterweight adjustment assembly.

[0011] A method for installing and measuring a clearance measuring device for a spindle bearing, wherein the spindle bearing comprises: a rear main bearing and a front main bearing, the rear main bearing and the front main bearing being disposed between a bearing seat and a spindle, the end surface of the rear main bearing being provided with a bearing end cover, the bearing end cover being provided with a bolt for controlling a preload torque, and wherein the clearance measuring device comprises: a displacement measuring sensor for acquiring position data of the spindle bearing, and a counterweight adjustment assembly for leveling the bearing seat;

[0012] The installation and measurement method of the main shaft bearing clearance measuring device comprises the following steps:

[0013] S1, rotating the bearing seat so that the bearing seat is in a leveling position;

[0014] S2, adjusting the distance between the displacement measuring sensor and the large end surface of the inner ring of the front main bearing, and fixing the displacement measuring sensor when the displacement measuring sensor reaches a preset position;

[0015] S3, recording the value of the displacement measuring sensor as L10, rotating the bearing seat 3 to 5 times, and then recording the value of the displacement measuring sensor again as L11;

[0016] S4, hot pressing and installing the inner ring of the rear main bearing;

[0017] S5, recording the value of the displacement measuring sensor and determining a value change of the displacement measuring sensor as L2, where L2 is the negative clearance of the front main bearing in a shrink-fit state;

[0018] S6, waiting for the inner ring of the rear main bearing to cool completely, recording the value of the displacement measuring sensor as L30, rotating the bearing seat 3 to 5 times, and then recording the value of the displacement measuring sensor again as L31.

[0019] A method for installing and measuring a clearance measuring device for a spindle bearing, wherein the method for placing the bearing seat in a leveling position in step S1 is as follows:

[0020] After each rotation of the bearing seat, measure the distance between the small end face of the inner ring of the front main bearing and the end face of the main shaft, and measure eight points. The deviation between the maximum and minimum values ​​of these eight points is less than or equal to 0.5 mm. If the difference in the average value is less than or equal to 0.03 mm after two consecutive rotations, it is considered that the bearing seat is in the leveling position.

[0021] A method for installing and measuring a clearance measuring device for a main shaft bearing, wherein the preset position is specifically: the deviation between the maximum and minimum values ​​of the distance between the displacement measuring sensor and the large end face of the inner ring of the front main bearing is less than or equal to 0.2 mm.

[0022] A method for installing and measuring a clearance measuring device for a main shaft bearing, which includes, before step S4, pre-tightening the high point area between the bearing end cover and the rear main bearing, wherein the high point area is the area where the bearing end cover contacts the rear main bearing, and the pre-tightening is performed by tightening the bolt to 50% of the rated tightening torque.

[0023] A method for installing and measuring a clearance measuring device for a spindle bearing, wherein after step S6, the method further includes: tightening the bolt to 70% of the rated tightening torque, recording the value of the displacement measuring sensor as L40, rotating the bearing seat 3 to 5 times, and then recording the value of the displacement measuring sensor again as L41.

[0024] A method for installing and measuring a clearance measuring device of a spindle bearing, wherein after recording the value of the displacement measuring sensor as L41 again, the method further comprises:

[0025] Tighten the bolt to the rated tightening torque, record the value of the displacement measuring sensor as L50, rotate the bearing seat 3 to 5 times, and then record the value of the displacement measuring sensor again as L51.

[0026] Compared with the background technology, the present invention provides a main shaft bearing clearance measuring device, the main shaft bearing includes: a rear main bearing and a front main bearing, the rear main bearing and the front main bearing are arranged in a bearing seat, the clearance measuring device includes: a displacement measuring sensor and a counterweight adjustment assembly, the displacement measuring sensor is used to measure the clearance of the main shaft bearing, the displacement measuring sensor is arranged facing the large end face of the inner ring of the front main bearing, and the counterweight adjustment assembly is used to level the bearing seat.

[0027] Displacement sensors monitor the deformation of the main bearing during installation. Multiple displacement sensors can be used to minimize inaccurate measurements caused by insufficient measurement points, reduce data errors, and improve measurement accuracy. A counterweight adjustment assembly can level the bearing seat, further enhancing the accuracy of the displacement sensor data.

[0028] The present invention provides an installation and measurement method for a main shaft bearing clearance measuring device. The main shaft bearing comprises: a rear main bearing and a front main bearing, the rear main bearing and the front main bearing are arranged between a bearing seat and a main shaft, a bearing end cover is provided on the end face of the rear main bearing, and a bolt for controlling a preload torque is provided on the bearing end cover. The clearance measuring device comprises: a displacement measuring sensor for acquiring main shaft bearing position data, and a counterweight adjustment component for leveling the bearing seat. The installation and measurement method for the main shaft bearing clearance measuring device comprises the following steps: S1, rotating the bearing seat so that the bearing seat is in a leveling position; S2, adjusting the distance between the displacement measuring sensor and the large end face of the inner ring of the front main bearing, when the displacement When the measuring sensor reaches the preset position, fix the displacement measuring sensor; S3, record the value of the displacement measuring sensor as L10, rotate the bearing seat 3 to 5 times, and then record the value of the displacement measuring sensor as L11 again; S4, install the inner ring of the main bearing after hot pressing; S5, record the value of the displacement measuring sensor and obtain the value change of the displacement measuring sensor as L2, where L2 is the negative clearance of the front main bearing in the hot-installed state; S6, wait for the inner ring of the rear main bearing to cool completely, record the value of the displacement measuring sensor as L30, rotate the bearing seat 3 to 5 times, and then record the value of the displacement measuring sensor as L31 again.

[0029] During the hot-press installation of the bearing end cover, due to the high temperature of the inner ring of the rear main bearing, the bearing will expand axially. During the hot-press installation, the retaining ring of the rear main bearing will cause the actual negative clearance of the bearing to be higher than the design value. The deformation of the bearing seat during the hot-press installation is monitored by a displacement measurement sensor. When the rear main bearing cools down, the deformation of the bearing is recorded again. This makes it possible to evaluate whether the negative clearance of the bearing during hot-press installation meets the design requirements, whether it exceeds the rated load capacity of the bearing itself, and whether it causes the bearing contact stress to exceed the yield point. By rotating the bearing seat multiple times, it can be ensured that the bearing rollers are uniformly stressed during the pre-tightening process, and prevent individual rollers from being locally stressed. The clearance measuring device of the main shaft bearing provided in this application and the installation measurement method thereof can detect whether the negative clearance of the main shaft bearing installation meets the technical requirements, ensure that the clearance of the main shaft bearing during final assembly meets the design requirements, and improve the safety and reliability of the main shaft bearing application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0031] Figure 1 A cross-sectional view of the spindle bearing provided by the present invention installed between the bearing seat and the spindle;

[0032] Figure 2 for Figure 1 A partial enlarged view of the middle I area;

[0033] Figure 3 This is a schematic diagram of the counterweight adjustment assembly provided by the present invention being installed on a bearing seat;

[0034] Figure 4 The present invention provides a flow chart of the installation and measurement method of the main shaft bearing clearance measuring device.

[0035] in:

[0036] 1-rear main bearing, 2-front main bearing, 3-bearing seat, 4-displacement measurement sensor, 5-counterweight adjustment assembly, 51-adjusting screw, 52-support rod, 6-fixing bracket, 7-main shaft, 8-bearing end cover, 9-bolt, 10-wind wheel, 11-retaining ring. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0039] The main shaft bearing clearance measuring device provided in the embodiment of the present application can be referred to in the appendix of the specification. Figure 1 To the attached Figure 3 The main shaft bearing includes: a rear main bearing 1 and a front main bearing 2. The rear main bearing 1 and the front main bearing 2 are arranged in a bearing seat 3. The clearance measuring device includes a displacement measuring sensor 4 and a counterweight adjustment assembly 5. The displacement measuring sensor 4 is used to measure the clearance of the main shaft bearing. The displacement measuring sensor 4 is arranged facing the large end face of the inner ring of the front main bearing 2. The counterweight adjustment assembly 5 is used to level the bearing seat 3.

[0040] It should be noted that in the specific embodiment provided herein, the bearing seat 3 is a single unit. Both the rear main bearing 1 and the front main bearing 2 utilize tapered roller bearings, with the front main bearing 2 having a larger inner diameter than the rear main bearing 1. The wind wheel 10 is connected to the main shaft 7, with the retaining ring 11 having an interference fit therewith. The inner ring of the front main bearing 2 is also connected to the main shaft with an interference fit, with the large end face of the inner ring of the front main bearing 2 axially aligned with the retaining ring 11. The outer ring of the front main bearing 2 is mounted on the bearing seat 3, with the large end face of the outer ring of the front main bearing 2 aligned with the stepped surface of the bearing seat 3. The rear main bearing 1 is also connected to the main shaft 7 with an interference fit, with the outer ring of the rear main bearing 1 mounted on the bearing seat 3, with the large end face of the outer ring of the rear main bearing 1 aligned with the stepped surface of the bearing seat 3. The rear main bearing 1 and the front main bearing 2 need to maintain negative clearance in the axial direction. By adding a bearing end cover 8 to the end face of the rear main bearing 1, the bearing end cover 8 is pre-tightened by the bolt 9. After the pre-tightening effect, the bearing end cover 8 fits tightly with the large end face of the bottom end of the inner ring of the rear main bearing 1.

[0041] In order to keep the bearing end cover 8 in a precise position during the pre-tightening process and ensure that the negative clearance of the bearing is within the specified design range, the displacement measuring sensor 4 detects the position change of the large end face of the inner ring of the rear main bearing 1 during the installation process to measure the negative clearance of the main shaft bearing. The counterweight adjustment assembly 5 can level the bearing seat 3, which can make the data obtained by the displacement measuring sensor 4 more accurate. In addition, multiple displacement measuring sensors 4 can be set, which can minimize inaccurate measurements caused by insufficient measurement points, reduce data errors, and improve the accuracy of measurement data. The displacement measuring sensor 4 and the counterweight adjustment assembly 5 can be fixed by threaded connection, so that when the main shaft bearing is installed and the negative clearance of the bearing meets the requirements, the displacement measuring sensor 4 and the counterweight adjustment assembly 5 can be quickly removed.

[0042] The displacement sensor 4 is mounted on a fixed bracket 6. One end of the bracket 6 is positioned on the end face of the bearing seat 3, and the other end of the bracket 6 is provided with the displacement sensor 4. The bracket 6 is used to secure the position of the displacement sensor 4. Once secured, the displacement sensor 4 is circumferentially aligned with the large end face of the inner ring of the front main bearing 2. The displacement sensor 4 is secured to the bracket 6 via a threaded connection. To facilitate securing the displacement sensor 4 in a specific position, the bracket 6 can be configured in a zigzag shape, depending on the actual situation.

[0043] As the instruction manual Figure 3 As shown, the counterweight adjustment assembly 5 is radially disposed on the bearing seat 3 and includes an adjustment screw 51 for adjusting the center of gravity of the counterweight adjustment assembly 5. Rotating the adjustment screw 51 changes the center of gravity of the counterweight adjustment assembly 5, thereby leveling the bearing seat 3 and making the data measured by the displacement measurement sensor 4 more accurate.

[0044] The counterweight adjustment assembly 5 also includes a support rod 52 for providing support. One end of the support rod 52 is mounted on the bearing seat 3, and the other end of the support rod 52 is mounted on the counterweight adjustment assembly 5. The support rod 52 is inclined at an angle to the adjustment screw 51, providing support for the radially extending counterweight adjustment assembly 5. This stabilizes the structure of the counterweight adjustment assembly 5 and makes rotation of the adjustment screw 51 smoother.

[0045] As the instruction manual Figure 4 As shown, an installation and measurement method of a clearance measuring device for a spindle bearing provided in an embodiment of the present application, the spindle bearing includes: a rear main bearing and a front main bearing, the rear main bearing and the front main bearing are arranged between a bearing seat and a spindle, a bearing end cover is provided on the end face of the rear main bearing, and the bearing end cover is provided with a bolt for controlling a preload torque, the clearance measuring device includes: a displacement measuring sensor for acquiring position data of the spindle bearing, and a counterweight adjustment assembly for leveling the bearing seat;

[0046] The steps of the installation and measurement method of the main shaft bearing clearance measuring device specifically include:

[0047] Step S1: rotating the bearing seat so that it is in a leveling position. After each rotation of the bearing seat, the distance between the small end face of the inner ring of the front main bearing and the end face of the main shaft is measured, and eight points are measured. The deviation between the maximum and minimum values ​​of these eight points is less than or equal to 0.5 mm. If the difference between the average values ​​after two consecutive rotations is less than or equal to 0.03 mm, it is considered that the bearing seat is in the leveling position.

[0048] Step S2: Adjust the distance between the displacement measuring sensor and the large end face of the inner ring of the front main bearing. When the displacement measuring sensor reaches a preset position, fix the displacement measuring sensor. The preset position is specifically defined as: the deviation between the maximum and minimum distances between the displacement measuring sensor and the large end face of the inner ring of the front main bearing is less than or equal to 0.2 mm.

[0049] Step S3, recording the value of the displacement measuring sensor as L10, rotating the bearing seat 3 to 5 times, and then recording the value of the displacement measuring sensor again as L11;

[0050] Step S4: hot-pressing the inner ring of the rear main bearing. Before hot-pressing, the high point area between the bearing end cover and the rear main bearing needs to be pre-tightened. The high point area is the area where the bearing end cover and the rear main bearing contact. The pre-tightening is performed by tightening the bolts to 50% of the rated tightening torque.

[0051] Step S5, recording the value of the displacement measuring sensor and obtaining a value change of the displacement measuring sensor as L2, where L2 is the negative clearance of the front main bearing in the shrink-fit state;

[0052] Step S6: Wait until the inner ring of the rear main bearing is completely cooled, record the value of the displacement measuring sensor as L30, rotate the bearing seat 3 to 5 times, and then record the value of the displacement measuring sensor again as L31;

[0053] Tighten the bolts to 70% of the rated tightening torque, record the value of the displacement measuring sensor as L40, rotate the bearing seat 3 to 5 times, and record the value of the displacement measuring sensor again as L41;

[0054] Tighten the bolts to the rated tightening torque, record the value of the displacement measuring sensor as L50, rotate the bearing seat 3 to 5 times, and record the value of the displacement measuring sensor again as L51.

[0055] In order to improve the accuracy of the measurement data of the displacement measurement sensor 4 and reduce data errors, taking the specific implementation method provided in this application as an example, the number of displacement measurement sensors 4 is specifically set to three, and the test values ​​of the three displacement measurement sensors 4 are usually inconsistent. The average value measured by the three displacement measurement sensors 4 is taken as the final value, and under the condition of the same bolt preload, the difference between the maximum and minimum displacement values ​​measured by the three displacement measurement sensors 4 should be less than or equal to 0.02 mm, otherwise the measurement is considered to have failed and needs to be adjusted and remeasured.

[0056] Based on the displacement sensor's measurements, the deformation of the front main bearing is calculated as Δ = (L50 + L51) / 2 - (L10 + L11) / 2. The weight of the bearing seat also causes deformation of the front main bearing. Using finite element analysis software, the deformation of the front main bearing due to the weight of the bearing seat is expressed as Δ1. Simultaneously, when the bolt preload torque is equal to the rated tightening torque, the deformation of the front main bearing in the vertical position is expressed as Δ2. The deformation of the front main bearing is calculated as Δ2 - Δ1. Δ2 - Δ1 is compared with the value of Δ. Finally, the software is used to infer the negative clearance of the rear and front main bearings. The maximum negative clearance during the preload process is estimated to be L2 - (L10 + L11) / 2. It is necessary to assess whether the roller contact stress of the bearing in this state does not exceed yield.

[0057] The above is a detailed introduction to the spindle bearing clearance measuring device and its installation and measurement method provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A clearance measuring device for a spindle bearing, the spindle bearing comprising: A rear main bearing (1) and a front main bearing (2), wherein the rear main bearing (1) and the front main bearing (2) are arranged in a bearing seat (3), characterized in that the clearance measuring device comprises a displacement measuring sensor (4) and a counterweight adjustment assembly (5), wherein the displacement measuring sensor (4) is used to measure the clearance of the main shaft bearing, the displacement measuring sensor (4) is arranged facing the large end face of the inner ring of the front main bearing (2), and the counterweight adjustment assembly (5) is used to level the bearing seat (3); The displacement measuring sensor (4) is arranged on a fixed bracket (6), one end of the fixed bracket (6) is arranged on the end surface of the bearing seat (3), and the other end of the fixed bracket (6) is provided with the displacement measuring sensor (4); The counterweight adjustment assembly (5) is radially arranged on the bearing seat (3), and the counterweight adjustment assembly (5) comprises an adjustment screw (51), and the adjustment screw (51) is used to adjust the center of gravity distance of the counterweight adjustment assembly (5).

2. The spindle bearing clearance measuring device according to claim 1, characterized in that: The counterweight adjustment assembly (5) further comprises a support rod (52) for providing support, one end of the support rod (52) being arranged on the bearing seat (3), and the other end of the support rod (52) being arranged on the counterweight adjustment assembly (5).

3. A method for installing and measuring a clearance measuring device for a spindle bearing, the spindle bearing comprising: A rear main bearing and a front main bearing, wherein the rear main bearing and the front main bearing are arranged between the bearing seat and the main shaft, the end face of the rear main bearing is provided with a bearing end cover, and the bearing end cover is provided with a bolt for controlling the preload torque, characterized in that the clearance measuring device applied to the main shaft bearing according to any one of claims 1 to 2 comprises: a displacement measuring sensor for obtaining position data of the main shaft bearing, and a counterweight adjustment assembly for leveling the bearing seat; The installation and measurement method of the main shaft bearing clearance measuring device comprises the following steps: S1, rotating the bearing seat so that the bearing seat is in a leveling position; S2, adjusting the distance between the displacement measuring sensor and the large end surface of the inner ring of the front main bearing, and fixing the displacement measuring sensor when the displacement measuring sensor reaches a preset position; S3, recording the value of the displacement measuring sensor as L10, rotating the bearing seat 3 to 5 times, and then recording the value of the displacement measuring sensor again as L11; S4, hot pressing and installing the inner ring of the rear main bearing; S5, recording the value of the displacement measuring sensor and determining a value change of the displacement measuring sensor as L2, where L2 is the negative clearance of the front main bearing in a shrink-fit state; S6, waiting for the inner ring of the rear main bearing to cool completely, recording the value of the displacement measuring sensor as L30, rotating the bearing seat 3 to 5 times, and then recording the value of the displacement measuring sensor again as L31.

4. The installation and measurement method of the main shaft bearing clearance measuring device according to claim 3, characterized in that: The method for the bearing seat to be in the leveling position in step S1 is: After each rotation of the bearing seat, measure the distance between the small end face of the inner ring of the front main bearing and the end face of the main shaft, and measure eight points. The deviation between the maximum and minimum values ​​of these eight points is less than or equal to 0.5 mm. If the difference in the average value is less than or equal to 0.03 mm after two consecutive rotations, it is considered that the bearing seat is in the leveling position.

5. The installation and measurement method of the main shaft bearing clearance measuring device according to claim 3, characterized in that: The preset position is specifically: the deviation between the maximum value and the minimum value of the distance between the displacement measurement sensor and the large end face of the inner ring of the front main bearing is less than or equal to 0.2 mm.

6. The installation and measurement method of the main shaft bearing clearance measuring device according to claim 3, characterized in that: Before step S4, the method further includes: pre-tightening the high point area between the bearing end cover and the rear main bearing, where the high point area is the area where the bearing end cover contacts the rear main bearing, and the pre-tightening is performed by tightening the bolts to 50% of the rated tightening torque.

7. The installation and measurement method of the main shaft bearing clearance measuring device according to claim 6, characterized in that: After step S6, the method further includes: tightening the bolt to 70% of the rated tightening torque, recording the value of the displacement measuring sensor as L40, rotating the bearing seat 3 to 5 times, and then recording the value of the displacement measuring sensor as L41 again.

8. The installation and measurement method of the main shaft bearing clearance measuring device according to claim 7, characterized in that: After recording the value of the displacement measurement sensor as L41 again, the method further includes: Tighten the bolt to the rated tightening torque, record the value of the displacement measuring sensor as L50, rotate the bearing seat 3 to 5 times, and then record the value of the displacement measuring sensor again as L51.

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