CN204101578U - Inertia turntable angular speed calibrating installation - Google Patents

Abstract

The utility model discloses an angular rate calibration device for an inertial turntable, which comprises a circular grating encoder, an encoder precision installation module, a data acquisition module, and a calibration software module. The encoder precision installation module includes a fixed shaft and an encoder fixed bracket. The fixed shaft is coaxially installed on the turntable table, the inner ring of the circular grating encoder is fixed on the fixed shaft, the outer ring of the circular grating encoder is fixed by the encoder fixing bracket, and the circular grating encoder is electrically connected with the data acquisition module. The data acquisition module is electrically connected with the calibration software module. The beneficial effects of the utility model are: dynamic calibration of angular velocity, high calibration accuracy, good stability, simple hardware system, and supporting related software with automatic analysis, processing and data query functions while having calibration standard functions, realizing Automated high precision calibration of turntable angular rate.

Description

Angular rate calibration device for inertial turntable

technical field

The utility model patent relates to an inertial turntable angular rate calibration device, which can perform on-site calibration of the turntable in real time.

Background technique

With the continuous development of technology, the precision requirements for the turntable work are getting higher and higher. One of the important indicators to measure the turntable is the angular rate. Therefore, the angular rate calibration technology of the turntable has become one of the key technologies for the calibration of the turntable.

There are many deficiencies in the existing rotary table angular rate calibration, mainly in the following aspects: 1) the calibration accuracy is low, the existing angular rate calibration device has a relatively simple structure, and can only realize the calibration of low-precision rotary tables; 2) the degree of automation is low, The manual reading method is easy to cause human error; 3) It is difficult to disassemble and assemble, which is inconvenient to improve manufacturing production efficiency and carry out post-maintenance work; 4) The waterproof and dustproof ability is poor, and equipment maintenance is difficult, resulting in high failure rates. Shortened service life.

In view of the above shortcomings, it is necessary to develop a high-precision rotary table angular rate calibration device with wide application range, high degree of automation and easy production and maintenance.

Utility model content

In view of this, the utility model provides a turntable angular rate calibration device, which adopts a high-precision circular grating encoder to realize automatic high-precision calibration of the angular rate of the inertial test turntable system, automatically analyze and process data, and realize calibration results and The printing of the certificate and the data query function are provided at the same time to query the completed calibration results, which effectively solves the technical problems of the existing angular rate calibration device with single function and low degree of automation.

The technical solution adopted by the utility model to solve its technical problems is: according to the provisions of GJB1801-93 "Inertial Technology Test Equipment Main Performance Test Method" method 107: the angular velocity of the turntable is calculated by the ratio of the angular position increment of the turntable to the time. After a series of calculations on the indicators, the utility model uses a high-precision circular grating encoder to measure the rotation angle of the turntable. Before the measurement, the circular grating encoder is installed on the measured turntable through the installation shaft, so that the encoder coincides with the measured axis. , to ensure that the coaxiality error is within the specified range. At the same time, a fixed bracket is used to fix the outer ring of the grating encoder according to the height of the turntable. When the turntable rotates, the grating encoder converts the turntable rotation into a pulse signal and sends it out. The decoding subdivision circuit decodes the output signal of the grating encoder, and counts the output signal of the grating encoder within the standard time of the high-stable crystal oscillator output. The single-chip microcomputer completes the acquisition and processing of the encoder data and communicates with the upper computer. On the upper computer, the calibration software is used to automatically analyze and process data, print the calibration results and certificates, and provide data query functions.

The specific plan is as follows:

An inertial turntable angular rate calibration device, comprising a circular grating encoder, an encoder precision installation module, a data acquisition module, and a calibration software module, is characterized in that:

The encoder precision installation module includes a fixed shaft and an encoder fixing bracket, the fixed shaft is coaxially installed on the turntable table, the inner ring of the circular grating encoder is fixed on the fixed shaft, and the outer ring of the circular grating encoder is fixed by the encoder fixing bracket , the circular grating encoder is electrically connected to the data acquisition module, and the data acquisition module is electrically connected to the calibration software module.

Preferably, the data acquisition module includes a decoding subdivision circuit, a single-chip microcomputer, a data communication module, a high-stable crystal oscillator, a circular grating encoder is electrically connected to the decoding subdivision circuit, and the decoding subdivision circuit is electrically connected to the single-chip microcomputer, and the single-chip microcomputer is respectively connected to the decoding subdivision circuit. The high stability crystal oscillator is electrically connected to the data communication module, and the data communication module is electrically connected to the calibration software module.

The beneficial effects of the utility model are: dynamic calibration of angular velocity, high calibration accuracy, good stability, simple hardware system, and supporting related software with automatic analysis, processing and data query functions while having calibration standard functions, realizing Automated high precision calibration of turntable angular rate.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 structural schematic diagram of the utility model.

In the figure 1. The fixed shaft of the circular grating encoder; 2. The fixed bracket of the encoder; 3. The high-precision circular grating encoder; 4. The decoding subdivision circuit; 5. Single-chip microcomputer; 6. Data communication module; 7. Calibration software module; 8. High stability crystal oscillator; 9. Turntable.

Detailed ways

In the embodiment shown in Figure 1, a turntable angular rate calibration device includes a circular grating encoder fixed shaft 1, an encoder fixed bracket 2, a circular grating encoder 3, a decoding subdivision circuit 4, a single-chip microcomputer 5, a data communication Module 6, calibration software 7, high stability crystal oscillator 8 and turntable 9. The fixed axis 1 of the circular grating encoder is installed on the table of the turntable 9 to ensure that the coaxiality between the fixed axis 1 and the turntable 9 meets the requirements. The inner ring of the circular grating encoder 3 is fixed on the fixed axis 1, and the circular grating encoder is fixed by the fixed bracket 2 1 outer ring, when the table top of the turntable 9 rotates, the fixed shaft 1 drives the inner ring of the circular grating encoder 3 to rotate, the circular grating encoder 3 is electrically connected to the data acquisition module, and the data acquisition module is electrically connected to the calibration software module .

In the present embodiment, the data acquisition module includes a decoding subdivision circuit 4, a single-chip microcomputer 5, a data communication module 6, a high stability crystal oscillator 8, and the circular grating encoder 3 is electrically connected with the decoding subdivision circuit 4, and the signal generated by the circular grating encoder 3 The quadrature signal output by the circular grating encoder 3 is subdivided and counted by the decoding subdivision circuit 4, the decoding subdivision circuit 4 is electrically connected to the single-chip microcomputer 5, and the single-chip microcomputer 5 is electrically connected to the high stability crystal oscillator 8 and the data communication module 6 respectively , the single-chip microcomputer 5 reads the grating signal for data processing within the standard time output by the high stability crystal oscillator 8, and the data communication module 6 is electrically connected with the calibration software module 7, and is sent to the calibration software 7 of the host computer through the data communication module 6 for processing. Calibration software 7 completes automatic analysis and data processing, realizes the printing of calibration results and certificates, and provides data query function to query the completed calibration results.

The angle measurement error of the high-precision circular grating encoder selected by the utility model is 1″, and the frequency accuracy of the high-temperature crystal oscillator is 1×10 ^-9 . The angular rate measurement range of the utility model: forward and reverse 0.0001°/s～2000 °/s; After being calibrated by the highest national defense measurement standard "low-speed turntable calibration device" used by Beijing 304, a calibration certificate is issued, and the maximum measurement error of the angular rate is:

9.2×10 ^-7 fixed angle interval 360°

5.0×10 ^-6 fixed angle interval 10°

7.0×10 ^-5 fixed angle interval 1°

3.3×10 ^-4 fixed angle interval 0.2°

The content not described in detail in the utility model is the well-known technology of those skilled in the art.

The technical solutions provided by the embodiments of the present invention have been introduced in detail above. In this paper, specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the above embodiments are only applicable to help understand the present invention. The principle of the embodiment; at the same time, for those of ordinary skill in the art, according to the embodiment of the present invention, there will be changes in the specific implementation and the scope of application. Utility model restrictions.

Claims (2)

1. an inertia turntable angular speed calibrating installation, comprises disk light beam encoder (3), scrambler accurate installation module, data acquisition module, calibration software module (7), it is characterized in that:

The accurate installation module of described scrambler comprises stationary shaft (1) and scrambler fixed support (2), stationary shaft (1) is coaxially installed on turntable (9) table top, disk light beam encoder (3) inner ring is fixed on stationary shaft (1), by fixing disk light beam encoder (3) outer ring of scrambler fixed support (2), disk light beam encoder (3) is electrically connected with described data acquisition module, and described data acquisition module is electrically connected with described calibration software module.

2. inertia turntable angular speed calibrating installation as claimed in claim 1, is characterized in that:

Described data acquisition module, comprise decoding sub-circuit (4), single-chip microcomputer (5), data communication module (6), high stability crystal oscillator (8), disk light beam encoder (3) is electrically connected with decoding sub-circuit (4), decoding sub-circuit (4) is electrically connected with single-chip microcomputer (5), single-chip microcomputer (5) is electrically connected with high stability crystal oscillator (8) and data communication module (6) respectively, and data communication module (6) is electrically connected with calibration software module (7).