Device and method for quantitatively applying pretightening force to bearing of antenna scanning mechanism

Abstract

The invention provides a device for quantitatively applying pretightening force to a bearing of an antenna scanning mechanism. The device comprises a driving unit shaft, a bearing, a balancing weight, a weight connecting rope, a pulley assembly, a weight, a shaft cover and a labyrinth sealing nut, the bearing is in shaft fit with the driving unit; the shaft cover is mounted above the bearing; the balancing weight is mounted above the shaft cover; the balancing weight applies pre-tightening force to the inner ring of the bearing through the shaft cover; one end of the weight connecting rope is connected with the outer ring of the bearing, and the other end is connected with the weight through the pulley assembly, and is used for testing the starting friction torque of the bearing under different pre-tightening forces. The pulley assembly converts the horizontal rotation of the bearing outer ring into the vertical movement of the weight. The labyrinth sealing nut is connected with the driving unit shaft and applies locking torque to the inner ring of the bearing. The invention further provides an antenna scanning mechanism bearing pre-tightening force quantitative applying method, the consistency of the starting friction torque testing state is kept, the bearing assembling accuracy is ensured, and operation personnel can achieve the method conveniently.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of space mechanism shafting assembly, and particularly relates to an antenna scanning mechanism bearing pre-tightening force quantitative application device and method. BACKGROUND

[0002] For a long-life antenna scanning drive mechanism continuously rotating in orbit, two pairs of double-row angular contact ball bearings are used for support to ensure the rotation accuracy of the mechanism and the rigidity of the entire shafting. The inner ring of the bearing is of a split structure, and the performance indexes such as the friction torque and the rigidity of the bearing are directly related to the axial pre-tightening force of the inner ring of the bearing. In use, a lock nut is used to apply a certain pre-tightening force to the inner ring of the bearing, so that the bearing can exert the best performance, and the connection between the lock nut and the shaft is a threaded connection, which can only apply a torque directly through a torque wrench, so the pre-tightening force applied to the inner ring of the bearing cannot be directly determined. In order to ensure the quantitative application of the pre-tightening force of the bearing, the friction torque of the bearing under different pre-tightening forces is measured, so that the locking torque of the lock nut corresponding to a specific pre-tightening force can be obtained, and the quantitative pre-tightening force of the bearing is indirectly obtained.

[0003] The existing conventional bearing pre-tightening force application method is to obtain the pre-tightening force by adjusting the thickness of the gasket or the elastic deformation of the bearing end cover, and this method mainly realizes the quantitative application of the pre-tightening force by controlling the compression amount of the inner ring of the bearing. Due to the limitation of the configuration of the antenna scanning mechanism shafting and the cumbersome compression amount test in the implementation process of the conventional method, it is difficult to realize. SUMMARY

[0004] The application aims to provide an antenna scanning mechanism bearing pre-tightening force quantitative application method and device, and solve the problem that the pre-tightening force of the bearing cannot be quantitatively applied in the existing shafting assembly.

[0005] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0006] An antenna scanning mechanism bearing pre-tightening force quantitative application device comprises a driving unit shaft, a bearing, a counterweight, a weight connecting rope, a pulley assembly, a weight, a shaft cover and a labyrinth seal nut.

[0007] The bearing is matched with the driving unit shaft.

[0008] The shaft cover is installed above the bearing.

[0009] The counterweight is installed above the shaft cover, and the counterweight applies a pre-tightening force to the inner ring of the bearing through the shaft cover.

[0010] One end of the weight connecting rope is connected with the outer ring of the bearing, and the other end is connected with the weight through the pulley assembly, and is used for testing the starting friction torque of the bearing under different pre-tightening forces.

[0011] The pulley assembly converts the horizontal rotation of the bearing outer ring into the vertical movement of the weight;

[0012] The labyrinth sealing nut is connected with the driving unit shaft, and a locking torque is applied to the inner ring of the bearing.

[0013] The bearing is a double-row angular contact ball bearing, and the inner ring is a split structure and is gap-fitted with the driving unit shaft.

[0014] The labyrinth sealing nut is designed with a hole for applying a quantitative locking torque to the inner ring of the bearing; and the hole is connected with the driving unit shaft through threads.

[0015] The upper center of the shaft cover and the weight is designed with a circular boss;

[0016] The weight is in a stepped shape, facilitating carrying, and the lower center is designed with a circular hole;

[0017] The circular boss and the circular hole are gap-fitted and are used for realizing the superimposed positioning of the weight in the horizontal direction.

[0018] The weight connecting rope is pasted on the outer ring of the bearing through adhesive tape.

[0019] A bearing pre-tightening force quantitative application method of an antenna scanning mechanism is provided, and the steps are as follows:

[0020] S1, by measuring the bearing starting friction torque under different weight pre-tightening forces, the quantitative relationship between the pre-tightening force and the bearing starting friction torque is obtained;

[0021] S2, by measuring the bearing starting friction torque under different locking torques of the labyrinth sealing nut, the quantitative relationship between the locking torque and the bearing starting friction torque is obtained;

[0022] S3, according to the quantitative relationship between the pre-tightening force, the locking torque and the bearing starting friction torque, the locking torque value corresponding to the pre-tightening force under the same starting friction torque is determined, and then the quantitative value of the pre-tightening force is obtained, so that the pre-tightening force required by the bearing is quantitatively applied through the labyrinth sealing nut.

[0023] In the step S1, a certain number of weights are hung to apply a quantitative pre-tightening force to the inner ring of the bearing.

[0024] In the step S1, different weights are hung to test the starting friction torque of the bearing under different pre-tightening forces.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] 1, the present application relates to the test bearing starting friction torque as an intermediate variable, and the locking torque and the pre-tightening force are associated, which is convenient for the operator to realize.

[0027] 2、The application converts the horizontal rotation of the bearing into vertical rotation through the pulley assembly, facilitating the test of the starting friction torque through the weight.

[0028] 3、The application keeps the consistency of the starting friction torque test state and ensures the accuracy of the test in the vertical state of the pre-tightening state of the counterweight and the locking state of the labyrinth sealing nut. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0030] Figure 1 The starting friction torque diagram of the double-row angular contact bearing under the pre-tightening force of the counterweight is shown in the application.

[0031] Figure 2 The cross-sectional view of the double-row angular contact bearing under the pre-tightening force of the counterweight is shown in the application.

[0032] Figure 3 The cross-sectional view of the double-row angular contact bearing under the locking torque of the labyrinth sealing nut is shown in the application.

[0033] The drawings show that: 1, the driving unit shaft; 2, the bearing; 3, the counterweight; 4, the weight connecting rope; 5, the pulley assembly; 6, the weight; 7, the shaft cover; 8, the labyrinth sealing nut.

[0034] Specific implementation

[0035] The application will be further described below in combination with the drawings and specific embodiments. It should be noted that the drawings are very simplified and non-precise ratios are used, only for the purpose of facilitating and clearly assisting the description of the embodiments of the application.

[0036] The bearing pre-tightening force quantitative application device of an antenna scanning mechanism includes a driving unit shaft 1, a bearing 2, a counterweight 3, a weight connecting rope 4, a pulley assembly 5, a weight 6, a shaft cover 7, and a labyrinth sealing nut 8.

[0037] The bearing 2 cooperates with the driving unit shaft 1.

[0038] The shaft cover 7 is installed above the bearing 2.

[0039] The counterweight 3 is installed above the shaft cover 7; the counterweight 3 applies pre-tightening force to the inner ring of the bearing 2 through the shaft cover 7.

[0040] One end of the weight connecting rope 4 is connected with the outer ring of the bearing 2, and the other end is connected with the weight 6 through the pulley assembly 5, which is used to test the starting friction torque of the bearing 2 under different pre-tightening forces;

[0041] The pulley assembly 5 converts the horizontal rotation of the outer ring of the bearing 2 into the vertical movement of the weight 6.

[0042] The labyrinth sealing nut 8 is connected with the drive unit shaft 1, and applies a locking torque to the inner ring of the bearing 2.

[0043] The bearing 2 is a double-row angular contact ball bearing, and the inner ring is a split structure and is gap-fitted with the drive unit shaft 1.

[0044] The labyrinth sealing nut 8 is designed with a hole for applying a quantitative locking torque to the inner ring of the bearing 2; the hole is connected with the drive unit shaft 1 through threads.

[0045] The shaft cover 7 and the upper center of the counterweight 3 are designed with a circular boss;

[0046] The counterweight 3 is in a stepped shape, which is convenient for carrying, and the lower center is designed with a circular hole.

[0047] The circular boss and the circular hole are gap-fitted, and are used to realize the superimposed positioning of the counterweight 3 in the horizontal direction.

[0048] The weight connecting rope 4 is pasted on the outer ring of the bearing 2 through adhesive tape.

[0049] A quantitative pre-tightening force applying method for an antenna scanning mechanism bearing, the steps are as follows:

[0050] S1, by measuring the starting friction torque of the bearing 2 under different pre-tightening forces of the counterweight 3, the quantitative relationship between the pre-tightening force and the starting friction torque of the bearing 2 is obtained;

[0051] S2, by measuring the starting friction torque of the bearing 2 under different locking torques of the labyrinth sealing nut 8, the quantitative relationship between the locking torque and the starting friction torque of the bearing 2 is obtained;

[0052] S3, according to the quantitative relationship between the pre-tightening force, the locking torque and the starting friction torque of the bearing 2, the locking torque value corresponding to the pre-tightening force under the same starting friction torque is determined, and then the quantitative value of the pre-tightening force is obtained, realizing the quantitative application of the pre-tightening force required by the bearing 2 through the labyrinth sealing nut 8.

[0053] In the step S1, a certain number of counterweights 3 are used to apply a quantitative pre-tightening force to the inner ring of the bearing 2.

[0054] In the step S1, the starting friction torque of the bearing 2 under different pre-tightening forces is tested by hanging different weights of the weight 6.

[0055] The principle of the embodiment is that the quantitative relationship between the pre-tightening force and the starting friction torque of the bearing 2 is obtained by measuring the starting friction torque of the bearing 2 under different pre-tightening forces of the weight 3. The quantitative relationship between the locking torque and the starting friction torque of the bearing 2 is obtained by measuring the starting friction torque of the bearing 2 under different locking torques of the labyrinth sealing nut 8. According to the relationship between the pre-tightening force, the locking torque and the starting friction torque of the bearing 2, the locking torque value corresponding to the pre-tightening force under the same starting friction torque is determined, and the pre-tightening force required by the bearing 2 is quantitatively applied through the labyrinth sealing nut 8.

[0056] Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications to the technical solutions of the present application by using the disclosed methods and technical contents without departing from the spirit and scope of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not depart from the technical solutions of the present application, belongs to the protection scope of the technical solutions of the present application. The contents not described in detail in the specification of the present application are the known technology of the person skilled in the art.

Claims

1. An antenna scanning mechanism bearing pre-tightening force quantitative application device, characterized in that: it comprises a driving unit shaft (1), a bearing (2), a counterweight block (3), a weight connecting rope (4), a pulley assembly (5), a weight (6), a shaft cover (7), a labyrinth seal nut (8); the bearing (2) cooperates with the driving unit shaft (1); the shaft cover (7) is installed above the bearing (2); the counterweight block (3) is installed above the shaft cover (7); the counterweight block (3) applies pre-tightening force to the inner ring of the bearing (2) through the shaft cover (7); one end of the weight connecting rope (4) is connected with the outer ring of the bearing (2), and the other end is connected with the weight (6) through the pulley assembly (5), which is used for testing the starting friction torque of the bearing (2) under different pre-tightening forces; the pulley assembly (5) converts the horizontal rotation of the outer ring of the bearing (2) into the vertical movement of the weight (6); the labyrinth seal nut (8) is connected with the driving unit shaft (1) and applies locking torque to the inner ring of the bearing (2).

2. The antenna scanning mechanism bearing pre-tightening force quantitative application device according to claim 1, characterized in that: the bearing (2) is a double-row angular contact ball bearing, and the inner ring thereof is a split structure and cooperates with the driving unit shaft (1) in a clearance fit.

3. The antenna scanning mechanism bearing pre-tightening force quantitative application device according to claim 1, characterized in that: the labyrinth seal nut (8) is designed with a hole for applying quantitative locking torque to the inner ring of the bearing (2); and the hole is connected with the driving unit shaft (1) through threads.

4. The antenna scanning mechanism bearing pre-tightening force quantitative application device according to claim 1, characterized in that: the shaft cover (7) and the upper center of the counterweight block (3) are designed with circular bosses; the counterweight block (3) is in a stepped shape, and the lower center thereof is designed with a circular hole; the circular bosses and the circular hole are in a clearance fit and are used for realizing the superimposed positioning of the counterweight block (3) in the horizontal direction.

5. The antenna scanning mechanism bearing pre-tightening force quantitative application device according to claim 1, characterized in that: the weight connecting rope (4) is pasted on the outer ring of the bearing (2) through adhesive tape. The steps are as follows: S1, obtain the quantitative relationship between the pre-tightening force and the starting friction torque of the bearing (2) by measuring the starting friction torque of the bearing (2) under different pre-tightening forces of the counterweight block (3); S2, obtain the quantitative relationship between the locking torque and the starting friction torque of the bearing (2) by measuring the starting friction torque of the bearing (2) under different locking torques of the labyrinth seal nut (8); S3, determine the locking torque value corresponding to the pre-tightening force under the same starting friction torque according to the quantitative relationship between the pre-tightening force, the locking torque and the starting friction torque of the bearing (2), and then obtain the quantitative value of the pre-tightening force, so as to realize the quantitative application of the pre-tightening force required by the bearing (2) through the labyrinth seal nut (8).

7. The antenna scanning mechanism bearing pre-tightening force quantitative application method according to claim 6, characterized in that: in the step S1, a certain number of counterweight blocks (3) are used to apply quantitative pre-tightening force to the inner ring of the bearing (2). ​ ​ ​ ​ ​ ​ 6. A method for quantitatively applying a bearing pre-load force to an antenna scanning mechanism, characterized by, ​ ​ ​ ​ ​ ​ 8. The method of claim 6, wherein: In step S1, the starting friction torque of the bearing (2) under different pre-tightening forces is tested by hanging different weights (6).

Images