CN109631942B - Input shaft misalignment angle leveling device of quartz accelerometer - Google Patents

Input shaft misalignment angle leveling device of quartz accelerometer Download PDF

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CN109631942B
CN109631942B CN201811499742.8A CN201811499742A CN109631942B CN 109631942 B CN109631942 B CN 109631942B CN 201811499742 A CN201811499742 A CN 201811499742A CN 109631942 B CN109631942 B CN 109631942B
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quartz accelerometer
leveling
leveled
watch
watch core
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CN109631942A (en
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张阳
党建军
冯东棉
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Xian Aerospace Precision Electromechanical Institute
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups

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Abstract

The invention relates to a device for leveling an input shaft misalignment angle of a quartz accelerometer. The invention solves the problems that the bottom of the meter shell is deformed and the misalignment angle is easy to be out of tolerance due to mutual repulsion force between the meter core and the meter shell in the misalignment angle leveling process of the existing quartz accelerometer. The device comprises a leveling block, an adjusting bracket arranged on the leveling block and three leveling screws uniformly arranged on the adjusting bracket; a shell of the quartz accelerometer to be leveled is arranged on the leveling block; the universal joint screw rod is also included; the universal joint screw comprises a hemispherical head part and a screw part; the adjusting bracket is provided with a pit; the hemispherical head part is embedded in the pit, and the screw rod part extends out of the pit and then is in threaded connection with a watch core of the quartz accelerometer to be leveled, so that the watch core of the quartz accelerometer to be leveled is suspended in a watch case of the quartz accelerometer to be leveled; three leveling screws extend into the interior of a watch case of the quartz accelerometer to be leveled and are in contact with a watch core of the quartz accelerometer to be leveled.

Description

Input shaft misalignment angle leveling device of quartz accelerometer
Technical Field
The invention relates to the field of accelerometer testing, in particular to a device for leveling an input shaft misalignment angle of a quartz accelerometer.
Background
The accelerometer is an inertial navigation device for measuring acceleration by utilizing Newton's second law (inertial law), is widely applied to weapon systems such as missiles, submarines, airships and the like, and is one of core components of the weapon navigation system. The misalignment angle of the input axis of the accelerometer (hereinafter referred to as misalignment angle) is the alignment error angle of the input axis of the accelerometer relative to the output reference axis. The main factor affecting the misalignment angle is the degree of parallelism of the sensitive components (quartz pendulums) inside the accelerometer, relative to the geometric mounting surface of the accelerometer housing. The better the parallelism of the two, the smaller the misalignment angle, the better the spatial position stability of the two, and the better the stability of the misalignment angle. The smaller the misalignment angle is, the higher the stability is, the more accurate the external acceleration acquired by the accelerometer is, and the higher the navigation precision is.
The levelling of the misalignment angle is performed during the mounting of the core (sensitive part) to the accelerometer case. The position of the watch core relative to the watch case is continuously adjusted until the misalignment angle meets the technical index (theoretically, the output is zero). However, due to the limitations of the current leveling process, the misalignment angle changes constantly over time after adjustment is complete. The out-of-tolerance angle can seriously affect the qualification rate of the accelerometer, and the out-of-tolerance angle at the later stage is easy to drift, thereby greatly reducing the use precision of the accelerometer on the model. The problem of out-of-tolerance angle is at present urgently to be solved.
The leveling principle of the misalignment angle of the accelerometer is shown in fig. 1 at present, the accelerometer comprises a meter case 1 and a meter core 2, the meter case 1 is firstly placed and fixed on an adjusting block 3, then a small piece of elastic gasket 4 (glass cloth plate) is placed at the bottom of the meter case 1, then the meter core 2 (sensitive part) is placed at the bottom of the meter case 1 through the elastic gasket 4, an adjusting bracket 5 is fixed above the leveling block 3, three leveling screws 6 are uniformly distributed on the adjusting bracket 5, the three leveling screws 6 extend into the meter case 1 and are in contact with the meter core 2, the three leveling screws 6 are respectively rotated to apply force to the meter core 2, the output of the meter core 2 (sensitive part) is observed, and the spatial position of the meter core 2 relative to the mounting surface of the meter case 1 is adjusted through the output. When the relative spatial position between the watch core 2 and the watch case 1 meets the index, glue is coated between the watch core 2 and the watch case 1, then the glue is dried and cured, and finally the three leveling screws 6 are removed. At this point, the accelerometer input axis misalignment angle leveling process is complete.
In the current misalignment angle leveling method, because an elastic gasket exists between a watch core and a watch case, the misalignment angle can hardly be adjusted to zero theoretically, can only approach infinitely, and the leveling efficiency is low.
Secondly, mutual repulsion exists between the watch core and the watch case through transition of the elastic gasket, after environmental tests, the mutual repulsion is easy to cause the bottom of the watch case to creep and deform, and the bottom of the watch case is raised when serious;
on the other hand, mutual repulsion force easily causes the spatial position of the watch core to change along with the time, and further causes the long-term stability of the misalignment angle to be poor.
Disclosure of Invention
In order to solve the problems that mutual repulsion exists between a meter core and a meter shell to cause deformation of the bottom of the meter shell and the misalignment angle is easy to be out of tolerance in the misalignment angle leveling process of the existing quartz accelerometer, the basic method of suspending and leveling the meter core is adopted to fundamentally solve the problem that repulsion exists between the meter core and the meter shell in the existing process.
In order to achieve the purpose of the invention, the invention adopts the following specific technical scheme:
the invention provides a quartz accelerometer input shaft misalignment angle leveling device, which comprises a leveling block, an adjusting bracket arranged on the leveling block and three leveling screws uniformly arranged on the adjusting bracket, wherein the leveling block is provided with a leveling hole; a shell of the quartz accelerometer to be leveled is arranged on the leveling block;
the improvement is as follows: the universal joint screw rod is also included; the universal joint screw comprises a hemispherical head part and a screw part; the adjusting bracket is provided with a pit; the hemispherical head part is embedded in the pit, and the screw rod part extends out of the pit and then is in threaded connection with a watch core of the quartz accelerometer to be leveled, so that the watch core of the quartz accelerometer to be leveled is suspended in a watch case of the quartz accelerometer to be leveled; three leveling screws extend into the interior of a watch case of the quartz accelerometer to be leveled and are in contact with a watch core of the quartz accelerometer to be leveled.
Further, the concave pit is composed of a hemispherical concave part and a round hole part; the shape and the size of the hemispherical concave part are matched with those of the hemispherical head; the diameter of the round hole part is larger than that of the screw part.
Furthermore, the adjusting bracket comprises three mutually connected supporting arms which are distributed along the circumferential direction at an angle of 120 degrees, and each supporting arm is fixed on the leveling block through a screw; the concave pits are formed in the crossed positions of the three supporting arms.
Furthermore, grease or lead powder is arranged at the contact position of the hemispherical head part and the pit.
Further, the invention optimizes the key parameters of the leveling device, reasonably saves the internal space of the watch core and the mechanical reliability and the service durability of the leveling device on the premise of meeting the leveling requirement through the space distribution relationship between the watch core and the watch case, and specifically comprises the following steps:
depth h of the round hole1The clearance between the diameter of the round hole part and the diameter of the screw rod part is h2B is a gap between the bottom of the watch core of the quartz accelerometer to be leveled and the watch case of the quartz accelerometer to be leveled;
wherein,depth h of the round hole1The calculation formula of (2) is as follows:
Figure GDA0002415969290000041
the clearance between the diameter of the round hole part and the diameter of the screw rod part is h2The calculation formula of (2) is as follows:
Figure GDA0002415969290000042
the calculation formula that the gap between the bottom of the watch core of the quartz accelerometer to be leveled and the watch case of the quartz accelerometer to be leveled is b is as follows:
Figure GDA0002415969290000043
a is the gap between the watch core and the watch case, D1Diameter of screw portion of universal joint screw, D2Is the diameter of the hemispherical head of the universal joint screw rod, L is the distance from the upper end surface of the watch core to the upper end surface of the adjusting bracket, D3The diameter of the watch core and the height of the watch core are H.
The invention has the beneficial effects that:
1) the invention suspends the watch core through the universal joint screw rod, thereby fundamentally solving the defects that the misalignment angle is easy to be out of tolerance and the repeatability is poor caused by the existing misalignment angle leveling process.
2) The invention adopts the spherical design between the universal joint screw and the adjusting bracket, completely releases the rotational freedom degree of the screw part, and further can ensure that the watch core obtains any posture in the leveling process.
3) According to the leveling device, the key parameters of the leveling device are optimized through interference calculation, and the internal space of the watch core and the mechanical reliability and the use durability of the leveling device are reasonably saved on the premise of meeting the leveling requirement through the space distribution relation between the watch core and the watch shell.
Drawings
Fig. 1 is a schematic structural view of a conventional leveling device.
Fig. 2 is a structural outline view of the leveling device of the invention.
Fig. 3 is a cross-sectional view of a leveling device of the present invention.
FIG. 4 is a schematic view of an assembly of the gimbaled screw and the adjustment bracket.
FIG. 5 is another schematic view of the assembly of the gimbaled screw and the adjustment bracket.
FIG. 6 is a schematic diagram of a core interference calculation of a quartz accelerometer to be leveled.
FIG. 7 is a schematic diagram of calculation of the rotational limit position of the screw of the universal joint.
Fig. 8 is a calculation schematic diagram of the clearance h 2.
Fig. 9 is a schematic diagram of calculation of the thickening barrier h 1.
Fig. 10 is a schematic diagram of the calculation of the core flying distance b.
The reference numbers are as follows:
1-watchcase, 2-watch core, 3-leveling block, 31-blind hole, 4-elastic gasket, 5-adjusting bracket, 51-pit, 511-semispherical recess, 512-circular hole part, 52-supporting arm, 53-screw, 6-leveling screw, 7-universal joint screw, 71-semispherical head and 72-screw part.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 2, 3 and 4, the leveling device comprises a leveling block 3, an adjusting bracket 5 arranged on the leveling block 3, three leveling screws 6 uniformly arranged on the adjusting bracket 5 and a universal joint screw 7; the leveling block 3 is provided with a blind hole 31, a meter shell 1 (hereinafter, simply referred to as a meter shell) of the quartz accelerometer to be leveled is fixed in the blind hole 31, and the universal joint screw 7 comprises a hemispherical head part 71 and a screw part 72; the adjusting bracket 5 is provided with a pit 51; the hemispherical head 71 is embedded in the pit 51, and the screw part 72 is extended out of the pit 51 and screwed with the watch core 2 (hereinafter, simply referred to as watch core), thereby suspending the watch core 2 in the watch case 1; three leveling screws 6 extend into the interior of the watch case 1 and are in contact with the watch core 2. Three leveling screws 6 are respectively rotated to apply force to the watch core 2, the output of the watch core 2 is observed, and the spatial position of the watch core 2 relative to the mounting surface of the watch case 1 is adjusted through the output. Because the universal joint screw 7 can freely rotate in the pit 51, the watch core 2 can obtain any posture in the leveling process. The leveling flexibility is better, and theoretically, the misalignment angle of the input shaft of the accelerometer can be enabled to be zero.
Based on the basic design, the leveling device also makes the following optimized design:
optimization 1:
as shown in fig. 5, the dimple 51 is composed of a hemispherical concave portion 511 and a circular hole portion 512; the hemispherical concave portion 511 is matched with the shape and size of the hemispherical head portion 71, and the diameter of the round hole portion 512 is larger than that of the screw portion 72. Therefore, a thickened barrier h1 (round hole depth) is added at the contact position of the universal joint screw 7 and the pit 51 of the adjusting bracket 5, so that the reliability of the spherical contact can be improved, and meanwhile, a movable gap h2 is formed between the screw part 72 and the round hole part 512, so that the interference between the universal joint screw 7 and the adjusting bracket 5 in the misalignment angle leveling process can be prevented.
And (3) optimizing 2: in order to facilitate the universal joint screw to be screwed into or out of the watch core, a linear groove (convenient for flat screwdriver operation) or an inner hexagonal groove (convenient for inner hexagonal wrench operation) is formed in the hemispherical head 71 of the universal joint screw 7.
And (3) optimization: in order to make the adjusting bracket mechanism reasonable and have good stability, the invention also provides a specific structure of the adjusting bracket 5: the three-support-arm support comprises three support arms 52 which are mutually connected, wherein the three support arms 52 are distributed at an angle of 120 degrees along the circumferential direction, and each support arm 52 is fixed on the leveling block 3 through a screw 53; the pockets 51 open at the intersection of three support arms 52.
Optimization, 4: leveling device critical dimension optimization
The inertial navigation system for optimizing the suspension height of the watch core requires that the accelerometer is miniaturized as much as possible, so that the space between the watch core and the bottom of the watch case is as small as possible when the leveling requirement is met in the leveling process of the misalignment angle, the space can be saved, and the miniaturization requirement is met.
As shown in figure 6, the clearance a between the core and the case is a fixed dimension of the accelerometer components, and during the misalignment angle leveling the core begins to rotate about point O, ensuring that during levelingThe edges of the lower end face of the watch core, the middle convex part of the watch core and the upper end face of the watch core draw circles, and the shortest arc is the smallest path and is the first contact point (mechanical limit). Arc lengths of S1, S2, S3, S4 and Smax. By calculating SmaxAt the minimum path, the angle of rotation of the watch movement about point O is Wmax. I.e. maximum rotation W of the movementmaxThe inner wall of the watch case is touched, and the minimum distance of the suspending watch core is b, so that the leveling process can be smoothly carried out without being influenced.
The core suspension distance b and the minimum rotation angle W of the core at the mechanical limit are determined in the calculation of FIG. 6max. By calculation, as shown in fig. 7, the thickened rampart (clearance between the diameter of the circular hole portion and the outer diameter of the screw portion) h1 and the clearance (depth h2 of the circular hole portion) were adjusted so that the rotation angle W' at which the gimbaled screw reached the limit rotation position was smaller than WmaxTherefore, the theoretical posture of the leveling process, namely the leveling arbitrariness, can be ensured.
The calculation process is as follows:
1) clearance h of motion2And thickening rampart h1Computing
Firstly, the limit rotation angle W of the watch core is calculatedmaxThe calculation is as follows, as shown in fig. 8:
when the rotation angle is very small, the rotation angle is obtained by theta ≈ tan thetamaxThe arc length subtended is the gap a between the watch core and the watch case, when:
Figure GDA0002415969290000081
wherein D is3The diameter of the watch core is shown, the height of the watch core is H, and the distance from the upper end face of the watch core to the upper end face of the adjusting bracket is L (wherein the distance from the upper end face of the watch core to the upper end face of the adjusting bracket is L which is determined according to the size of the watch case and the height size of the three supporting arms, and the value range of L is generally 15mm-20 mm);
2) calculation of clearance of movement h2The calculation is as follows:
Figure GDA0002415969290000082
to obtain
Figure GDA0002415969290000083
Figure GDA0002415969290000084
Then by
Figure GDA0002415969290000085
Therefore, it is not only easy to use
Figure GDA0002415969290000086
Wherein, W1Is the angle between the central line of the watch core and the connecting line between the central point of the side wall of the watch core and the center O of the rotation circle, D1Diameter of screw portion of universal joint screw, D2The diameter of the hemispherical head of the universal joint screw rod;
thickened rampart h1The calculation is as follows, as shown in fig. 9:
from the law of similarity of right triangles
HX 2＝(D2-h1)h1
To obtain
Figure GDA0002415969290000091
Also known from the figures
Figure GDA0002415969290000092
Is finished to obtain
Figure GDA0002415969290000093
According to the root-finding formula h1Greater than 0 to
Figure GDA0002415969290000094
Wherein HXIs the radius of the circular hole part;
3) the core flying distance b is calculated as shown in fig. 10:
let the radius of rotation of the watch core be λ
Figure GDA0002415969290000095
Therefore, it is not only easy to use
Figure GDA0002415969290000096
While
Figure GDA0002415969290000097
Therefore, it is not only easy to use
Figure GDA0002415969290000098
Brought in to
Figure GDA0002415969290000099
So that the suspension distance of the watch core meets
Figure GDA00024159692900000910
Through the spatial distribution relation between the watch core and the watch case, the internal space of the watch core and the mechanical reliability and the use durability of the leveling device are reasonably saved on the premise of meeting the leveling requirement.
And (5) optimization: in the specific operation process, lubricating grease or lead powder and the like are arranged at the contact position of the hemispherical head of the universal joint screw and the pit to improve the lubricating effect.
The test proves that: the leveling device has high leveling efficiency, can level the misalignment angle of the accelerometer within the range far smaller than the technical index of the prior process, and has more stable misalignment angle at the later stage and high repetition precision.

Claims (5)

1. A device for leveling an input shaft misalignment angle of a quartz accelerometer comprises a leveling block, an adjusting bracket arranged on the leveling block and three leveling screws uniformly arranged on the adjusting bracket; a shell of the quartz accelerometer to be leveled is arranged on the leveling block;
the method is characterized in that: the universal joint screw rod is also included; the universal joint screw comprises a hemispherical head part and a screw part; the adjusting bracket is provided with a pit; the hemispherical head part is embedded in the pit, and the screw rod part extends out of the pit and then is in threaded connection with a watch core of the quartz accelerometer to be leveled, so that the watch core of the quartz accelerometer to be leveled is suspended in a watch case of the quartz accelerometer to be leveled; three leveling screws extend into the interior of a watch case of the quartz accelerometer to be leveled and are in contact with a watch core of the quartz accelerometer to be leveled.
2. The quartz accelerometer input axis misalignment angle leveling device of claim 1, wherein: the concave pit consists of a hemispherical concave part and a round hole part; the shape and the size of the hemispherical concave part are matched with those of the hemispherical head; the diameter of the round hole part is larger than that of the screw part.
3. The quartz accelerometer input axis misalignment angle leveling device of claim 2, wherein: the adjusting bracket comprises three mutually connected supporting arms which are distributed at an angle of 120 degrees along the circumferential direction, and each supporting arm is fixed on the leveling block through a screw; the concave pits are formed in the crossed positions of the three supporting arms.
4. The quartz accelerometer input axis misalignment angle leveling device of claim 3, wherein: and lubricating grease or lead powder is arranged at the contact position of the hemispherical head and the pit.
5. The quartz accelerometer input axis misalignment angle leveling device of claim 4, wherein: depth h of the round hole1The clearance between the diameter of the round hole part and the diameter of the screw rod part is h2B is a gap between the bottom of the watch core of the quartz accelerometer to be leveled and the watch case of the quartz accelerometer to be leveled;
wherein the depth h of the round hole part1The calculation formula of (2) is as follows:
Figure FDA0002415969280000021
the clearance between the diameter of the round hole part and the diameter of the screw rod part is h2The calculation formula of (2) is as follows:
Figure FDA0002415969280000022
the calculation formula that the gap between the bottom of the watch core of the quartz accelerometer to be leveled and the watch case of the quartz accelerometer to be leveled is b is as follows:
Figure FDA0002415969280000023
a is the gap between the watch core and the watch case, D1Diameter of screw portion of universal joint screw, D2Is the diameter of the hemispherical head of the universal joint screw rod, L is the distance from the upper end surface of the watch core to the upper end surface of the adjusting bracket, D3The diameter of the watch core and the height of the watch core are H.
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CN111024985B (en) * 2019-12-17 2022-07-05 北京航天控制仪器研究所 Misalignment angle adjusting device for tire-embracing type quartz accelerometer
CN114384276A (en) * 2020-10-22 2022-04-22 航天科工惯性技术有限公司 Accelerometer gauge outfit assembling structure and method
CN114660327A (en) * 2020-12-23 2022-06-24 航天科工惯性技术有限公司 Accelerometer gauge head mounting clamp and control method of accelerometer mounting error angle

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