阅读说明：本技术 一种应用于液浮陀螺仪浮子组件的质心精密预调方法 (Centroid precision pre-adjusting method applied to liquid floating gyroscope float assembly ) 是由 赵倩云 赵丙权 赵新宇 侯文超 刘金龙 于 2021-07-29 设计创作，主要内容包括：本发明涉及一种应用于液浮陀螺仪的质心精密预调方法,步骤为：1、把浮子组件安装在平衡架上；2、调制平衡油并置入玻璃油槽中；3、将平衡架至于玻璃油槽中,观察浮子组件径向转动情况,若浮子固定向一个方向偏转,通过钻孔去除平衡螺母上对应于该方位的部分质量,最终达到浮子组件在平衡油中不转动；4、将玻璃油槽置于振动台上,用针杆轻压浮子组件外表面,使浮子组件不转动；5、打开振动台电源达稳定振动状态,取下针杆；6、观察浮子组件转动情况；若出现浮子组件向质心偏重方向转动,在平衡螺母上对应于偏重的方位用刮刀刮擦其表面以去除微小的质量；7、重复步骤6,直至浮子组件趋于不转动,完成径向平衡精密预调。本方法简化了陀螺仪结构、提高了装配效率。(The invention relates to a method for precisely pre-adjusting a mass center of a liquid floated gyroscope, which comprises the following steps of: 1. mounting the float assembly on the gimbal; 2. preparing balance oil and placing the balance oil into a glass oil groove; 3. placing the balance frame in a glass oil groove, observing the radial rotation condition of the floater assembly, if the floater is fixed to deflect in one direction, removing part of mass corresponding to the direction on the balance nut through drilling, and finally achieving that the floater assembly does not rotate in balance oil; 4. placing the glass oil groove on a vibration table, and slightly pressing the outer surface of the floater component by using a needle rod to make the floater component not rotate; 5. turning on a power supply of the vibration table to achieve a stable vibration state, and taking down the needle rod; 6. observing the rotation condition of the floater component; if the floater component rotates towards the direction of mass center unbalance, scraping the surface of the balance nut by using a scraper in a position corresponding to the unbalance to remove tiny mass; 7. and (6) repeating the step until the floater component tends to not rotate, and finishing the precise pre-adjustment of the radial balance. The method simplifies the structure of the gyroscope and improves the assembly efficiency.)

1. A method for precisely presetting a mass center of a liquid floated gyroscope is characterized by comprising the following steps:

step 1, installing a floater assembly of a liquid floated gyroscope on a balancing stand, and inserting ball small shafts at two ends of the floater assembly into bearing holes at two sides of the balancing stand; the diameter of the bearing hole and the diameter of the ball small shaft meet the clearance fit of 0.006 mm-0.008 mm;

step 2, preparing the balance oil, namely adjusting the viscosity of the balance oil to (1.85 +/-0.05) mm under the temperature environment of 20 ℃ besides the specific gravity value meeting the design requirement²S; placing the prepared balance oil into a glass oil groove with a flat bottom surface;

step 3, placing the balance frame with the installed floater component into a glass oil groove, observing the radial rotation condition of the floater component, and if the floater component does not rotate basically, indicating that the floater component achieves preliminary radial balance; if the floater is fixedly deflected in one direction, indicating that the center of mass of the floater deflects to the direction, and removing part of mass on a balance nut of the floater assembly corresponding to the direction through drilling to adjust the center of mass of the floater assembly; finally, the floater component does not rotate in the balance oil, and preliminary radial balance is realized;

step 4, placing the glass oil tank on a vibration table, placing the floater component in the glass oil tank along with the balance frame, and lightly pressing the outer surface of the floater component by using a needle rod to ensure that the floater component does not rotate;

step 5, turning on a power supply of the vibration table, adjusting the vibration frequency to a set value of 50Hz, taking down the needle rod after the vibration is stable, wherein the float assembly cannot be stressed in the process of taking down the needle rod;

step 6, observing the rotation condition of the floater component in a stable vibration environment; if the float component tends not to rotate, the surface float component achieves accurate radial balance, and the radial balance adjustment of the float component is finished; if the floater component rotates towards the direction of mass center unbalance, after the radial unbalance direction of the floater component is determined, scraping the surface of the balance nut by using a scraper to remove tiny mass at the position on the balance nut corresponding to the unbalance;

and 7, repeating the step 6 until the floater component tends to not rotate, and finishing the precise pre-adjustment of the radial balance of the floater component.

2. The method for precisely presetting the mass center of the liquid floated gyroscope as claimed in claim 1, wherein: the needle bar is a copper needle, and the weight of the needle bar does not exceed 5 g; one end of the copper needle is fixed on the glass oil groove, and the other end naturally falls on the outer surface of the floater.

Technical Field

The invention belongs to the technical field of liquid floated gyroscope adjustment, and particularly relates to a centroid precision pre-adjusting method applied to a liquid floated gyroscope.

Background

Regardless of anisoelasticity, the liquid-floated gyroscope static drift model can be expressed as: omega_d＝D_f+D_if_i+D_sf_s+S_e(ii) a In the model equation, the drift coefficients Di and Ds related to the specific forces fi and fs are closely related to the coincidence degree of the center of mass and the floating center of the floater assembly, the higher the coincidence degree of the center of mass and the floating center of the floater assembly is, the smaller the values of Di and Ds are, and the total drift omega of the liquid floated gyroscope is_dIt is effectively controlled. For a liquid-floated gyroscope applied in a certain field, specific single technical index requirements are often provided for Di and Ds.

For a high-precision liquid floated gyroscope, a mode of precision presetting and tester assembling is often adopted, and even a mode of precision presetting and static balancer adjusting is adopted to ensure that Di and Ds meet the design requirements. The tester assembly process is complex, and the time cost and the economic cost are increased; the static balancer adjustment can complicate the structure of the gyroscope, and can increase corresponding fault risk points while ensuring the relevant technical indexes to be qualified.

For a medium-low precision liquid floated gyroscope, considering that the structure is as simple as possible and the reliability of the gyroscope is improved, a static balancer structure is not selected to be designed generally; meanwhile, in order to control the economic cost and the time cost, the technological process of assembling the tester is not adopted as much as possible.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a method for precisely presetting the mass center of a liquid floated gyroscope.

The invention has the advantages and positive effects that:

a method for precisely presetting a mass center of a liquid floated gyroscope is characterized by comprising the following steps:

step 1, installing a floater assembly of a liquid floated gyroscope on a balancing stand, and inserting ball small shafts at two ends of the floater assembly into bearing holes at two sides of the balancing stand; the diameter of the bearing hole and the diameter of the ball small shaft meet the clearance fit of 0.006 mm-0.008 mm;

step 2, preparing the balance oil, namely adjusting the viscosity of the balance oil to (1.85 +/-0.05) mm under the temperature environment of 20 ℃ besides the specific gravity value meeting the design requirement²S; placing the prepared balance oil into a glass oil groove with a flat bottom surface;

step 3, placing the balance frame with the installed floater component into a glass oil groove, observing the radial rotation condition of the floater component, and if the floater component does not rotate basically, indicating that the floater component achieves preliminary radial balance; if the floater is fixedly deflected in one direction, indicating that the center of mass of the floater deflects to the direction, and removing part of mass on a balance nut of the floater assembly corresponding to the direction through drilling to adjust the center of mass of the floater assembly; finally, the floater component does not rotate in the balance oil, and preliminary radial balance is realized;

step 4, placing the glass oil tank on a vibration table, placing the floater component in the glass oil tank along with the balance frame, and lightly pressing the outer surface of the floater component by using a needle rod to ensure that the floater component does not rotate;

step 5, turning on a power supply of the vibration table, adjusting the vibration frequency to a set value of 50Hz, taking down the needle rod after the vibration is stable, wherein the float assembly cannot be stressed in the process of taking down the needle rod;

step 6, observing the rotation condition of the floater component in a stable vibration environment; if the float component tends not to rotate, the surface float component achieves accurate radial balance, and the radial balance adjustment of the float component is finished; if the floater component rotates towards the direction of mass center unbalance, after the radial unbalance direction of the floater component is determined, scraping the surface of the balance nut by using a scraper to remove tiny mass at the position on the balance nut corresponding to the unbalance;

and 7, repeating the step 6 until the floater component tends to not rotate, and finishing the precise pre-adjustment of the radial balance of the floater component.

Further: the needle bar is a copper needle, and the weight of the needle bar does not exceed 5 g; one end of the copper needle is fixed on the glass oil groove, and the other end naturally falls on the outer surface of the floater.

The invention has the advantages and positive effects that:

1. in a vibration environment, the small ball shaft of the floater assembly can be separated from the bearing hole up and down in the vibration environment by means of measures such as balancing the floater assembly in advance according to the traditional process steps, controlling vibration frequency, balancing oil viscosity, and keeping the gap between the small ball shaft of the floater assembly and the bearing, and the like, but the radial rotation of the floater assembly cannot be influenced.

2. The invention realizes the precise presetting of the medium-low precision liquid floated gyroscope, controls the precision of the precise presetting of the liquid floated gyroscope and ensures the qualified survival rate of one-time assembly of the liquid floated gyroscopes Di and Ds;

3. the static balance precision is improved without a static balance structure, and the structure of the gyroscope is simplified;

4. the invention does not need to improve the static balance precision by installing a tester, simplifies the assembly process, saves the assembly cost and improves the assembly efficiency.

Drawings

FIG. 1 is a schematic view of the float assembly of the present invention;

FIG. 2 is a schematic view of the gimbal structure of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic view of the installation of the float assembly of the present invention;

FIG. 5 is a schematic view of the primary radial balance adjustment means of the float assembly of the present invention;

FIG. 6 is a schematic illustration of the de-weighted engagement of the center of mass of the float assembly with the balance nut for initial radial balance adjustment of the float assembly of the present invention;

FIG. 7 is a schematic view of the position of the ball stud in the bearing hole of the float assembly of the present invention in a condition of initial radial balance adjustment;

FIG. 8 is a schematic view of the precise adjustment mechanism of the float assembly of the present invention on the vibration table;

FIG. 9 is a schematic illustration of the exact radial balance adjustment of the center of mass of the float assembly in conjunction with the counterbalance nut of the present invention;

fig. 10 is a schematic view of the position of the ball small shaft in the bearing hole under the condition of fine radial balance adjustment of the float assembly of the invention.

Detailed Description

The structure of the present invention will be further described by way of examples with reference to the accompanying drawings. It is to be understood that this embodiment is illustrative and not restrictive.

The invention discloses a method for precisely presetting a mass center of a liquid floated gyroscope, which is applied to fig. 1-10 and comprises the following steps:

step 1, installing a floater assembly 1 (figure 1) of the liquid floated gyroscope on a balancing frame 2 (figure 2), wherein the balancing frame adopts a U-shaped frame structure, coaxial opposite installation holes are formed in two vertical edges of the balancing frame, bearing assemblies 2.1 (figures 2 and 3) are installed in the installation holes in the two sides, a bearing assembly at one end is directly fixed in an installation hole in one side of the balancing frame, a bearing assembly at the other end can be axially adjusted, and the bearing assembly at the other end is axially and inwards screwed after the floater assembly is installed in place, so that ball small shafts 1.1 at two ends of the floater assembly are respectively inserted into bearing holes 2.1.1 of the bearing assemblies at two sides of the balancing frame. The bearing hole ensures smooth inner wall, and the diameter of the bearing hole and the diameter of the ball small shaft meet the clearance fit of 0.006 mm-0.008 mm.

Step 2, preparing the balance oil 4, namely adjusting the viscosity of the balance oil to be (1.85 +/-0.05) mm under the temperature environment of 20 ℃ besides the specific gravity value meeting the design requirement²S; placing the prepared balance oil into a glass oil groove 3 with a flat bottom surface;

and 3, placing the balance frame with the installed floater assembly into a glass oil groove, and finishing the radial balance of the floater assembly according to the traditional process steps. The traditional process comprises the steps of axial balance adjustment and radial balance adjustment of a floater component, specifically, a glass oil tank is placed on a table top, the floater component is directly placed in the oil tank, the suspension condition of a floater in oil is observed, and balance nuts with different weights are selected to be screwed at two ends of the floater to realize the axial balance of the floater component; then, a floater assembly realizing axial balance is arranged on a balance frame, the floater assembly is placed in a glass oil groove along with the balance frame, the radial rotation condition of the floater assembly is observed, if the floater is fixed to deflect towards one direction, the mass center 1.3 of the floater assembly deviates towards the direction, and partial mass corresponding to the direction on a balance nut 1.2 of the floater assembly is removed through a drill hole 1.4 to adjust the mass center of the floater assembly, and the reference is made in fig. 6; finally, the floater component tends not to rotate in the balance oil, and radial balance is realized. The invention relates to a method for precisely presetting the mass center, which only adjusts the radial balance of a floater assembly, so that the step only relates to the adjustment of the radial balance of the floater assembly.

And 4, placing the glass oil groove on a vibration table 5, selecting a unidirectional vibration table, placing the floater component in the glass oil groove along with the balance frame, and lightly pressing the outer surface of the floater component by using a needle rod to ensure that the floater component does not rotate. The needle rod can be made of different materials, in the invention, the needle rod preferably adopts a self-made copper needle, and the needle rod is an auxiliary tool mainly for assisting the floater component to stand, but the weight of the needle rod is not more than 5 g; one end of the needle rod is fixed on the glass oil groove, and the other end naturally falls on the outer surface of the float assembly.

And 5, turning on a power supply of the vibration table, adjusting the vibration frequency to a set value of 50Hz, taking down the needle rod after the vibration is stable, and enabling the floater component not to be stressed in the process of taking down the needle rod. After the needle rod is taken down, the static friction force between the ball small shafts at the two ends of the floater and the bearing holes of the balance frame is changed by vibration, the stress balance state of the floater is broken, and the floater can radially rotate to a certain degree;

step 6, observing the rotation condition of the floater component in a stable vibration environment; if the float component tends to basically not rotate, the surface float component achieves accurate radial balance, and the radial balance adjustment of the float component is finished; if the floater component rotates towards the direction of the mass center unbalance, after the radial unbalance direction of the floater component is determined, a scraper is used for scraping the surface of the balance nut to remove tiny mass at the position corresponding to the unbalance direction on the balance nut, the scraper can be a scalpel, and a scraping area 1.5 in the attached drawing is marked with black in a drawing, and fig. 9 is shown.

And 7, repeating the step 6 until the floater component tends to be basically not rotated, and finishing the precise pre-adjustment of the radial balance of the floater component.

Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit of the invention and the scope of the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.