CN213238942U

CN213238942U - Mechanical shafting structure suitable for high-frequency vibration

Info

Publication number: CN213238942U
Application number: CN202022431435.5U
Authority: CN
Inventors: 张长清; 张欣; 孙振华; 廖瑞珍
Original assignee: Jiujiang Precision Measuring Technology Research Institute
Current assignee: Jiujiang Precision Measuring Technology Research Institute
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-05-18
Anticipated expiration: 2030-10-28

Abstract

The utility model provides a mechanical shafting structure suitable for high-frequency vibration, includes the base, be equipped with the main shaft in the base, from top to bottom in proper order the cover is equipped with revolving stage bearing, driving motor and lower bearing subassembly on the main shaft, revolving stage bearing's rotor and main shaft fixed connection, revolving stage bearing's stator fixed mounting is on the base, lower bearing subassembly includes through lower bearing bracket and base fixed connection's step, is equipped with a pair of suit in the step and is main epaxial angular contact ball bearing pair, angular contact ball bearing pair adopts "face-to-face" structural mounting, and is a pair of angular contact ball bearing pair between be equipped with lower bearing inner spacer and lower bearing outer spacer, be fixed with the lower bearing end cover on the lower terminal surface of step. The structure solves the problems of low inherent frequency and large friction of the mechanical shafting of the existing high-frequency angular vibration inertia test turntable, thereby meeting the test and assessment of various performance indexes of inertial navigation of new-generation aircrafts and weaponry.

Description

Mechanical shafting structure suitable for high-frequency vibration

Technical Field

The utility model relates to a mechanical shafting structure suitable for high-frequency vibration.

Background

With the rapid development of aerospace technology, the requirement on the maneuverability of an aircraft is higher and higher, and an important factor influencing the maneuverability is the frequency response bandwidth problem of an inertia device of the aircraft. The high-frequency angular vibration inertia test turntable is used as an important device for testing the frequency response bandwidth of an inertia device, and the performance index of the turntable directly influences the development of the inertia device.

The high-frequency angular vibration inertia test turntable is one of inertia test devices, mainly provides single-degree-of-freedom sine angular motion excitation with wide range, low distortion and accurate amplitude control for a test piece, can periodically track a given signal, eliminates periodic errors, is important equipment for dynamic performance test and parameter identification of an inertia sensitive device, and plays a key role in improving the performance of the inertia sensitive device in the technical state.

Compared with developed countries, the research of the turntables in China starts late, but develops rapidly, and particularly in recent years, with the rapid development of the technical level of computers in China, the research of the turntables, particularly the digital control technology, achieves the rapid development situation. But key technologies such as a mechanical shaft system, drive control and the like still have great defects, especially the inherent frequency of the shaft system is small, the friction force is large, and the requirements of a new generation of aircraft inertial navigation test platform in China cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model discloses its aim at provides a mechanical shafting structure suitable for high-frequency vibration to solve the problem in the above-mentioned background art, it is good to have the shafting rigidity, and antidumping moment is strong, and frictional force is little, characteristics that the natural frequency of shafting is high.

The technical scheme adopted for achieving the purpose is that the mechanical shafting structure suitable for high-frequency vibration comprises a base, wherein a main shaft is arranged in the base, a rotary table bearing, a driving motor and a lower bearing assembly are sequentially sleeved on the main shaft from top to bottom, a rotor of the rotary table bearing is fixedly connected with the main shaft, a stator of the rotary table bearing is fixedly installed on the base, the lower bearing assembly comprises a lower bearing seat fixedly connected with the base through a lower bearing support, a pair of angular contact ball bearing pairs sleeved on the main shaft is arranged in the lower bearing seat, the angular contact ball bearing pairs are installed in a face-to-face structure, a lower bearing inner spacer and a lower bearing outer spacer are arranged between the pair of angular contact ball bearings, and a lower bearing end cover is fixed on the lower end face of the lower bearing seat.

Further, the base is formed by processing grey cast iron HT 250.

Advantageous effects

Compared with the prior art, the utility model has the following advantages.

The utility model has the advantages that, the shafting upper end of this structure adopts the revolving stage bearing as the shafting owner to support, and the lower extreme adopts the angular contact ball bearing of one set of "face-to-face" installation as the auxiliary stay, and it has the shafting rigidity good, and antidumping moment is strong, and frictional force is little, and the high characteristics of natural frequency of shafting can solve current high frequency angular vibration inertia test revolving stage mechanical axis natural frequency low, the big problem of frictional force to satisfy the test and the examination that new generation aircraft and weaponry are used to each item performance index of leading.

Drawings

The present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a structural sectional view of the present invention;

FIG. 2 is a perspective view of the present invention;

shown in the figure: 1. the bearing comprises a turntable bearing, 2. a base, 3. a lower bearing support, 4. a lower bearing seat, 5. an angular contact ball bearing pair, 6. a lower bearing inner spacer ring, 7. a lower bearing end cover, 8. a lower bearing outer spacer ring, 9. a lower bearing assembly, 10. a driving motor and 11. a main shaft.

Detailed Description

The present invention will be further described with reference to the following embodiments and the accompanying drawings.

The utility model provides a mechanical shafting structure suitable for high-frequency vibration, includes base 2, as shown in fig. 1, 2, be equipped with main shaft 11 in the base 2, from top to bottom in proper order the cover is equipped with revolving stage bearing 1, driving motor 10 and lower bearing assembly 9 on the main shaft 11, revolving stage bearing 1's rotor and main shaft 11 fixed connection, revolving stage bearing 1's stator fixed mounting is on base 2, lower bearing assembly 9 includes through lower bearing support 3 and base 2 fixed connection's step 4, is equipped with a pair of angular contact ball bearing pair 5 of suit on main shaft 11 in the step 4, angular contact ball bearing pair 5 adopts "face-to-face" structure installation, and is a pair of angular contact ball bearing pair 5 between be equipped with lower bearing circle 6 and lower bearing outer spacer 8, be fixed with lower bearing end cover 7 on the lower terminal surface of step 4.

The base 2 is made of grey cast iron HT 250.

The utility model comprises a turntable bearing 1, a base 2, a lower bearing bracket 3, a lower bearing seat 4, an angular contact ball bearing pair 5, a lower bearing inner spacer 6, a lower bearing end cover 7, a lower bearing outer spacer 8, a lower bearing assembly 9, a driving motor 10 and a main shaft 11; the turntable bearing 1 is positioned and installed on the base 2 through the outer ring of the stator, is in clearance fit and is fixed through screws, the turntable bearing 1 is in clearance fit with the upper end of the main shaft 11 through the inner ring of the rotor, and is fixed through screws in the same way, so that a fixed end is formed and plays a role of main support;

the diameter of the inner hole of the turntable bearing 1 is large, the diameter of a main shaft matched with the turntable bearing is larger, and therefore the rigidity of the main shaft is better.

The lower bearing assembly 9 comprises a lower bearing seat 4, a pair of angular contact ball bearings 5 which are arranged in a face-to-face structure are arranged in the lower bearing seat 4, a lower bearing inner spacer 6 and a lower bearing outer spacer 8 are arranged between 2 angular contact ball bearings, and a lower bearing end cover 7 is fixed on the lower bearing seat 4 through screws.

The end face runout of 2 angular contact ball bearings 5 is measured by marking a table in the installation process of the angular contact ball bearing pair 5, and the pretightening amount of a lower bearing assembly 9 is controlled within the range of 0.01 mm-0.02 mm by grinding a lower bearing inner spacer 6 and a lower bearing outer spacer 8.

The base 2 is made of a grey cast iron HT250 material, and is good in rigidity and high in natural frequency.

When the utility model is implemented, the turntable bearing 1 is respectively fixed with the main shaft 11 and the base to form a shaft system fixed end as a main support of the shaft system; the angular contact ball bearing pair 5 in the lower bearing assembly 9 is installed in a face-to-face structure, is arranged at the lower end of the main shaft 11, is fixed in the radial direction, and axially forms a free end to play a role in auxiliary support; the scheme has the characteristics of large diameter of the main shaft, strong bearing capacity, high connection rigidity, strong anti-overturning moment, small friction force and the like, and the shafting can reach very high inherent frequency, thereby obtaining better mechanical performance and providing possibility for improving the frequency response bandwidth of the high-frequency angular vibration inertia test turntable.

Claims

1. A mechanical shafting structure suitable for high-frequency vibration comprises a base (2) and is characterized in that a main shaft (11) is arranged in the base (2), a turntable bearing (1), a driving motor (10) and a lower bearing assembly (9) are sequentially sleeved on the main shaft (11) from top to bottom, a rotor of the turntable bearing (1) is fixedly connected with the main shaft (11), a stator of the turntable bearing (1) is fixedly installed on the base (2), the lower bearing assembly (9) comprises a lower bearing seat (4) fixedly connected with the base (2) through a lower bearing support (3), a pair of angular contact ball bearing pairs (5) sleeved on the main shaft (11) is arranged in the lower bearing seat (4), the angular contact ball bearing pairs (5) are installed in a face-to-face structure, a lower bearing ring (6) and a lower bearing outer spacer ring (8) are arranged between the pair of angular contact ball bearing pairs (5), and a lower bearing end cover (7) is fixed on the lower end surface of the lower bearing seat (4).

2. The mechanical shafting structure suitable for high-frequency vibration according to claim 1, wherein said base (2) is made of gray cast iron HT 250.