A gravity compensation device for one-dimensional turntable ground test

Abstract

The present invention relates to a ground test equipment, and in particular to a gravity compensation device for a one-dimensional turntable ground test, the device comprises a tapered coupling, an air bearing, a pressure sensor and a mounting platform; the stator of the air bearing is connected to the mounting platform, the rotor of the air bearing is equipped with a pressure sensor, the pressure sensor is connected to the lower end of the rotor of the one-dimensional turntable through a tapered coupling, and the upper end of the rotor of the one-dimensional turntable is used to install an external load. The use of the device makes the angular contact bearing of the one-dimensional turntable no longer affected by the gravity of the external load, prolongs the service life of the angular contact bearing, and at the same time, the pressure sensor can accurately obtain the size of the reaction of the air bearing used to offset the gravity of the one-dimensional turntable, ensuring the reliability of the ground test.

Description

Technical Field

[0001] The invention relates to ground test equipment, in particular to a gravity compensation device for a one-dimensional turntable ground test. Background Art

[0002] The relevant ground tests of space agencies are an important assessment process before launch. During the test and debugging process on the ground, gravity will have a great impact on the test results. Therefore, ground tests based on micro-low gravity simulation technology are an important guarantee for the success of space missions.

[0003] At present, the gravity compensation methods used in ground tests of micro-low gravity simulation technology mainly include water flotation method, suspension method, air flotation method, etc.

[0004] For a one-dimensional turntable, the water flotation method has great limitations, the suspension method has a complex structure, and the air flotation method uses air bearings to support the rotating parts and separate them from the base, thereby reducing friction during rotation and achieving a state of micro-low gravity or zero gravity. It is currently a more commonly used test method.

[0005] The rotating shaft system of the one-dimensional turntable includes a stator housing, a rotor, and an angular contact bearing set between the stator and the rotor. When the air flotation method is currently used for ground tests of micro-low gravity simulation technology, the stator housing is directly connected to the air flotation bearing, and the rotor is connected to the external load. However, this connection method will cause the angular contact bearing to be affected by the gravity of the external load, which will greatly shorten the service life of the angular contact bearing. Summary of the invention

[0006] In order to solve the problem that when using the air flotation method to conduct ground tests of micro-low gravity simulation technology, the angular contact bearings in the one-dimensional turntable are affected by the gravity of the external load, resulting in a greatly shortened service life of the angular contact bearings, the present invention provides a gravity compensation device for ground tests of one-dimensional turntables.

[0007] The technical solution adopted by the present invention is:

[0008] A gravity compensation device for a one-dimensional turntable ground test is provided, which is characterized by comprising a tapered coupling, an air bearing, a pressure sensor and a mounting platform;

[0009] The stator of the air bearing is connected to the mounting platform. The rotor of the air bearing is equipped with a pressure sensor. The pressure sensor is connected to the lower end of the rotor of the one-dimensional turntable through a conical coupling. The upper end of the rotor of the one-dimensional turntable is used to install an external load.

[0010] Furthermore, the above-mentioned installation platform is a three-dimensional mobile platform, including a lifting mechanism for adjusting the movement of the air bearing in the vertical direction and a two-dimensional centering mechanism for adjusting the movement of the air bearing in the horizontal plane.

[0011] Furthermore, the lifting mechanism comprises a base, legs, guide rods, screw rods and a bottom plate;

[0012] A plurality of legs are provided below the base;

[0013] There are at least three guide rods, and the upper ends of at least three guide rods are fixed to the bottom plate, and the lower ends are suspended after passing through the base;

[0014] The screw is threadedly connected to the base, the upper end of the screw contacts the bottom plate, the lower end of the screw serves as a driving part for the screw to rotate, and the screw is located between at least three guide rods.

[0015] Furthermore, the above-mentioned two-dimensional centering mechanism includes a transverse slide base, a transverse ball guide rail, a transverse ball slider, a longitudinal slide base, a longitudinal ball guide rail, a longitudinal ball slider and a longitudinal ball slide;

[0016] There are two transverse slide bases, which are fixedly mounted on the bottom plate in parallel;

[0017] There are two transverse ball guide rails, which are installed between the two transverse slide bases;

[0018] Both transverse ball guide rails are equipped with transverse ball sliders;

[0019] A longitudinal slide base is installed on each transverse ball slider;

[0020] A longitudinal ball guide rail is installed between the two longitudinal slide bases;

[0021] A longitudinal ball slider is installed on the longitudinal ball guide rail; a longitudinal ball slide is installed on the longitudinal ball slider, and the longitudinal ball slide is connected to the air bearing stator.

[0022] Furthermore, the upper end of the screw is spherical.

[0023] Furthermore, a driving motor is provided at the lower end of the screw.

[0024] Furthermore, the shaft end of the tapered coupling is installed on the pressure sensor, and the seat end of the tapered coupling is installed on the lower end of the rotor of the one-dimensional turntable.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention uses a tapered coupling to connect the rotor of the one-dimensional turntable with the air bearing, so that the angular contact bearing of the one-dimensional turntable is no longer affected by the gravity of the external load, thereby extending the service life of the angular contact bearing. At the same time, the pressure sensor can accurately obtain the size of the reaction of the air bearing used to offset the gravity of the one-dimensional turntable, thereby ensuring the reliability of the ground test.

[0027] 2. The present invention adopts a mounting platform for mounting an air bearing composed of a lifting platform and a two-dimensional centering mechanism, which enables the air bearing and the one-dimensional turntable to be automatically aligned, ensures the coaxiality of the assembly of the two, and ensures the reliability of the ground test. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of an embodiment of the gravity compensation device provided by the present invention.

[0029] The reference numerals are as follows:

[0030] 1-taper coupling, 11-taper coupling seat end, 12-taper coupling shaft end;

[0031] 2- Pressure sensor;

[0032] 3-Air bearing;

[0033] 4-two-dimensional centering mechanism, 41-transverse slide base, 42-transverse ball guide rail, 43-transverse ball slider, 44-longitudinal slide base, 45-longitudinal ball guide rail, 46-longitudinal ball slider, 47-longitudinal ball slide;

[0034] 5-lifting mechanism, 51-base, 52-legs, 53-guide rods, 54-screw rods, 55-bottom plate;

[0035] 6-rotor, 7-stator, 8-angular contact bearing. DETAILED DESCRIPTION

[0036] In order to make the purpose, advantages and features of the present invention clearer, the gravity compensation device for a one-dimensional turntable ground test proposed by the present invention is further described in detail below in combination with the accompanying drawings, basic implementation principles and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that: the accompanying drawings are all in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention; secondly, the structure shown in the drawings is often part of the actual structure; thirdly, the emphasis that each drawing needs to show is different, and sometimes different proportions are used.

[0037] Basic Implementation Principle

[0038] Since the stator housing of the one-dimensional turntable is directly connected to the air bearing and the rotor is connected to the external load when the existing air flotation method is used for the ground test of the micro-low gravity simulation technology, the angular contact bearing between the stator housing and the rotor will be affected by the gravity of the external load, and the service life of the angular contact bearing will be greatly shortened. The present invention adopts a gravity compensation device for the ground test of the one-dimensional turntable, which mainly includes a tapered coupling, an air bearing, a pressure sensor and a mounting platform; the stator of the air bearing is connected to the mounting platform, and the rotor of the air bearing is equipped with a pressure sensor, which is connected to the lower end of the rotor of the one-dimensional turntable through a tapered coupling, and the upper end of the rotor of the one-dimensional turntable is used to install the external load. It is precisely because the rotor is directly connected to the air bearing and the stator housing is not in contact with the air bearing, so the angular contact bearing will not be affected by the gravity of the external load, the service life of the angular contact bearing is guaranteed, and because the pressure sensor is used to directly obtain the gravity unloading state, the practicality is greatly enhanced.

[0039] Example

[0040] Figure 1 The specific structure of a gravity compensation device for a one-dimensional turntable ground test is given, including a tapered coupling 1, a pressure sensor 2, an air bearing 3, a two-dimensional centering mechanism 4 and a lifting mechanism 5;

[0041] The rotating shaft system of the one-dimensional turntable includes an internal rotor 6, an external stator 7, and an angular contact bearing 8 between the rotor 6 and the stator 7;

[0042] The lower end of the rotor 6 of the one-dimensional turntable rotating shaft system is provided with a conical coupling 1 for docking with the pressure sensor 2. The pressure sensor 2 is connected to the rotor of the air bearing 3. The stator of the air bearing 3 is connected to the two-dimensional centering mechanism 4. The two-dimensional centering mechanism 4 is provided on the lifting mechanism 5.

[0043] The assembly process of the gravity compensation device is as follows: first, it is installed on the rotor 6 of the one-dimensional turntable through the tapered coupling seat end 11, and then the tapered coupling shaft end 12 is connected to the pressure sensor 2, and then the pressure sensor 2 is installed on the rotor of the air bearing 3, and then the stator of the air bearing 3 is connected to the two-dimensional alignment mechanism 4, and finally the two-dimensional alignment mechanism 4 is connected to the lifting mechanism 5.

[0044] The use process of the gravity compensation device is as follows: firstly, high-pressure gas is introduced into the air bearing 3, and the lifting mechanism 5 is turned on to make the air bearing 3 rise, and the conical coupling seat end 11 and the conical coupling shaft end 12 begin to dock, and the load unloading state is judged by the pressure value collected by the pressure sensor 2, and when the pressure value reaches the gravity required to be unloaded, the lifting mechanism 5 stops rising. During the rising process of the air bearing 3, if the air bearing 3 is not concentric with the rotor 6 of the one-dimensional turntable, the conical coupling seat end 11 will generate a normal force on the conical coupling shaft end 12, so that the air bearing 3 automatically adjusts its position under the drive of the two-dimensional centering mechanism 4, thereby ensuring that the air bearing 3 is coaxial with the rotor 6 of the one-dimensional turntable.

[0045] The lifting mechanism 5 in this embodiment specifically includes a base 51, legs 52, guide rods 53, screw rods 54 and a bottom plate 55; a plurality of legs 52 are provided below the base 51; there are at least three guide rods 53, and the upper ends of at least three guide rods 53 are fixed on the bottom plate 51, and the lower ends are suspended after passing through the base 51; the screw rod 54 is threadedly connected to the base 51, the upper end of the screw rod 54 is in contact with the bottom plate 55 (in order to make the screw rod rotate flexibly, the upper end of the screw rod is a spherical surface), the lower end of the screw rod 54 serves as a driving part for the screw rod 54 to rotate, and the screw rod 54 is located between at least three guide rods 53. The screw rod 54 can be driven to rotate by turning the lower end of the screw rod with a wrench to rotate it, or by setting a driving motor at the lower end of the screw rod to rotate it.

[0046] The two-dimensional centering mechanism 4 in this embodiment includes a transverse slide base 41, a transverse ball guide 42, a transverse ball slider 43, a longitudinal slide base 44, a longitudinal ball guide 45, a longitudinal ball slider 46 and a longitudinal ball slide 47; there are two transverse slide bases 41, which are fixedly installed in parallel on the base plate 55; there are two transverse ball guides 42, which are installed between the two transverse slide bases 41; transverse ball sliders 43 are installed on the two transverse ball guides 42; a longitudinal slide base 44 is installed on each transverse ball slider 43; a longitudinal ball guide 45 is installed between the two longitudinal slide bases 44; a longitudinal ball guide 45 is installed on the longitudinal ball slider 46; a longitudinal ball slide 47 is installed on the longitudinal ball slider 46, and the longitudinal ball slide 47 is connected to the stator of the air bearing 3.

[0047] When the screw 54 is rotated, the bottom plate rises or falls vertically under the guidance of the guide rod 53, so that the two-dimensional centering mechanism 4 rises or falls; when the transverse ball slide 44 is subjected to a transverse force, it drives the transverse ball slider 43 fixed on its bottom surface to move along the transverse ball guide rail 42, thereby eliminating the transverse eccentricity. When the longitudinal ball slide 47 is subjected to a longitudinal force, it drives the longitudinal ball slider 46 fixed on its bottom surface to move along the longitudinal ball guide rail 45, thereby eliminating the longitudinal eccentricity.

Claims

1. A gravity compensation device for one-dimensional turntable ground test, characterized in that: Includes tapered coupling, air bearing, pressure sensor and mounting platform; The stator of the air bearing is connected to the mounting platform, the rotor of the air bearing is equipped with a pressure sensor, the pressure sensor is connected to the lower end of the rotor of the one-dimensional turntable through a conical coupling, and the upper end of the rotor of the one-dimensional turntable is used to install an external load; The installation platform is a three-dimensional mobile platform, including a lifting mechanism for adjusting the air bearing to move in the vertical direction and a two-dimensional centering mechanism for adjusting the air bearing to move in the horizontal plane; The lifting mechanism comprises a base, legs, guide rods, screw rods and a bottom plate; A plurality of legs are provided below the base; There are at least three guide rods, and the upper ends of at least three guide rods are fixed to the bottom plate, and the lower ends are suspended after passing through the base; The screw is threadedly connected to the base, the upper end of the screw contacts the bottom plate, the lower end of the screw serves as a driving part for the screw to rotate, and the screw is located between at least three guide rods.

2. The gravity compensation device for one-dimensional turntable ground test according to claim 1, characterized in that: The two-dimensional centering mechanism includes a transverse slide base, a transverse ball guide rail, a transverse ball slider, a longitudinal slide base, a longitudinal ball guide rail, a longitudinal ball slider and a longitudinal ball slide; There are two transverse slide bases, which are fixedly mounted on the bottom plate in parallel; There are two transverse ball guide rails, which are installed between the two transverse slide bases; Both transverse ball guide rails are equipped with transverse ball sliders; A longitudinal slide base is installed on each transverse ball slider; A longitudinal ball guide rail is installed between the two longitudinal slide bases; A longitudinal ball slider is installed on the longitudinal ball guide rail; a longitudinal ball slide is installed on the longitudinal ball slider, and the longitudinal ball slide is connected to the air bearing stator.

3. The gravity compensation device for one-dimensional turntable ground test according to claim 2, characterized in that: The upper end of the screw is a spherical surface.

4. The gravity compensation device for one-dimensional turntable ground test according to claim 3, characterized in that: A driving motor is arranged at the lower end of the screw.

5. The gravity compensation device for one-dimensional turntable ground test according to claim 4, characterized in that: The axial end of the conical coupling is installed on the pressure sensor, and the seat end of the conical coupling is installed on the lower end of the rotor of the one-dimensional turntable.

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