A turntable angular position measurement precision automatic detection device and method

Abstract

The present application relates to a kind of inertial platform testing device and method, specifically, a kind of rotary table angle position measurement precision automatic detection device and detection method, solve the technical problems that present technical difficulty quickly and accurately measure the rotation angle precision of the shaft angle encoder of rotary table or shaft angle encoder and automatically adjust tower difference.The present application is a kind of rotary table angle position measurement precision automatic detection device, including synchronous sampling unit, processing unit, autocollimator and tool shaft, regular 23 face prism, electric two-dimensional adjustment mechanism;Synchronous sampling unit is respectively connected with the communication of processing unit, autocollimator to be measured rotary table;Processing unit is used for according to the rotation angle of the rotary table to be measured, the rotation angle adjustment alpha axis of regular 23 face prism, beta axis, so that the tower difference between the rotation axis of regular 23 face prism and the rotation axis of the rotary table to be measured is minimum.The detection method of the present application can automatically detect the detection of the one angle precision of the rotary table to be measured, greatly improve work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to an inertial platform testing device and method, in particular to a rotary table angular position measurement precision automatic detection device and method. BACKGROUND

[0002] The rotary table is an advanced device carrying complex photoelectric load, which is widely used in aerospace testing and angle measurement fields, and provides high-precision angular position measurement information and angular position positioning for various loads carried thereby. Therefore, the angular position measurement precision index is particularly important as a core index before the rotary table product is shipped or during periodic calibration, and is regarded as a must-check item. At present, the angular position measurement precision of the rotary table is generally detected according to the method specified in GJB1801 “Inertial Technology Test Equipment Main Performance Test Method” or JJF1210 “Low-speed Rotary Table Calibration Specification” during product shipment detection or third-party calibration. The above methods have the following defects and deficiencies:

[0003] 1. All are manual operations, which are labor-intensive and prone to errors;

[0004] 2. There is no error calibration method and calibration link, and the measurement precision is too dependent on the experience of the operator, and the universality is poor;

[0005] 3. Only static testing can be performed, and dynamic angle measurement precision cannot be detected and evaluated.

[0006] The existing dynamic precision detection method for the rotary table shaft angle encoder is divided into the following two kinds: first, a higher precision encoder such as a 29-bit Heidenhain encoder is coaxially installed on the measured shaft angle encoder, and a motor is used to drive the two encoders to rotate synchronously, and the higher precision encoder is used as a true value to detect the measured encoder; second, a dynamic detection device based on a regular 23-face pyramid and a collimator; the regular 23-face pyramid is connected coaxially with the measured shaft angle encoder, and after the motor drives it to rotate continuously, the real angle of the measured shaft is detected in real time using the regular 23-face pyramid and the collimator, and then the real angle of the measured shaft is compared with the rotation angle to detect it.

[0007] However, the above two methods have the following defects: neither of them mentions the adjustment device and method of the standard detection material (high-precision shaft angle encoder or regular 23-sided polyhedron) and the tower difference (the spatial included angle between the rotation axis of the standard detection material and the rotation axis of the measured shaft), which has a greater impact on high-precision detection; in addition, the first method uses a higher-precision angle measuring unit for comparison and detection, which raises the problem of where the dynamic angle measuring precision of the higher-precision angle measuring unit comes from. Generally, only the static angle measuring precision of the angle measuring unit is detected when it is shipped, and the maximum working angular velocity is marked, and there is no dynamic angle measuring precision index. Therefore, the standard traceability becomes a problem, falling into a dead loop; in the second method, the realization of dynamic angle measurement highly depends on the high sampling rate of the autocollimator. The higher the speed of the measured shaft, the higher the sampling rate required by the autocollimator. In the rotating state, to realize high-precision synchronous collection, the sampling rate of the autocollimator generally needs to be at least 1 kHz, which cannot be achieved by the existing autocollimator unless the test resolution or the rotating speed is reduced. However, this will undoubtedly reduce the detection precision and the timeliness of the detection. SUMMARY

[0008] The purpose of the present application is to solve the technical problems that the prior art is difficult to quickly and accurately measure the rotation angle precision of the measured shaft of a rotary table or a shaft angle encoder and automatically adjust the tower difference, and to provide a rotary table angle position measurement precision automatic detection device and a detection method.

[0009] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0010] A rotary table angle position measurement precision automatic detection device, characterized in that it comprises a synchronous sampling unit, a processing unit, an autocollimator, a tool shaft, a regular 23-sided polyhedron, and an electric two-dimensional adjustment mechanism.

[0011] The regular 23-sided polyhedron is sleeved on the tool shaft, and its working surface is arranged opposite to the autocollimator.

[0012] The internal center of the electric two-dimensional adjustment mechanism is arranged on the same horizontal plane and provided with mutually perpendicular α-axis and β-axis, which are used for adjusting the rotation angles of the electric two-dimensional adjustment mechanism along the α-axis and the β-axis, respectively; the upper surface center of the electric two-dimensional adjustment mechanism is vertically fixed to the tool shaft, and the lower surface is coaxially fixed to the upper surface of the measured rotary table; the α-axis and the β-axis are respectively in communication connection with the processing unit.

[0013] The synchronous sampling unit is respectively connected in communication with the rotary table to be measured, the processing unit and the autocollimator; the autocollimator is used to collect the rotation angle of the regular 23-sided polyhedron when receiving the trigger signal sent by the synchronous sampling unit; the synchronous sampling unit is used to collect the rotation angle of the rotary table to be measured, and sends a trigger signal to the autocollimator when the rotary table to be measured rotates to the working angle of the regular 23-sided polyhedron, and sends the rotation angle of the rotary table to be measured and the rotation angle of the regular 23-sided polyhedron collected by the autocollimator to the processing unit; the processing unit is used to adjust the alpha axis and the beta axis according to the rotation angle of the rotary table to be measured and the rotation angle of the regular 23-sided polyhedron, so that the error between the rotation axes of the regular 23-sided polyhedron and the rotary table to be measured is minimized.

[0014] Further, the included angle error between adjacent working angles of the regular 23-sided polyhedron is ±100 angular seconds.

[0015] Further, the rotation range of the electric two-dimensional adjustment mechanism is not less than ±1°, and the adjustment resolution is not greater than 10 angular seconds.

[0016] Further, the collection delay of the synchronous sampling unit is not greater than 1ms.

[0017] Meanwhile, the application also provides a rotary table angular position measurement precision automatic detection method, which is characterized by comprising the following steps:

[0018] 1】Prepare the rotary table angular position measurement precision automatic detection device and perform self-calibration on it;

[0019] 2】Position the rotary table to be measured at 0°, and perform self-collimation between the autocollimator and the first working face of the regular 23-sided polyhedron, and clear the X-axis reading and Y-axis reading of the autocollimator;

[0020] 3】Drive the rotary table to be measured to rotate at its rated speed, and in the process of rotation, use the autocollimator to monitor the rotation angle ai of the regular 23-sided polyhedron in real time, and use the synchronous sampling unit to monitor the rotation angle θi of the rotary table to be measured in real time;

[0021] When the synchronous sampling unit monitors that the rotation angle θi of the rotary table to be measured rotates to the working angle of the regular 23-sided polyhedron, the synchronous sampling unit generates a trigger signal and sends it to the autocollimator, the autocollimator sends the rotation angle ai of the regular 23-sided polyhedron at this moment to the synchronous sampling unit, and the synchronous sampling unit sends the rotation angle θi of the rotary table to be measured and the rotation angle ai of the regular 23-sided polyhedron at this moment to the processing unit; i represents the working face number of the regular 23-sided polyhedron, i=1, 2, 3…23; the rotation angle ai of the regular 23-sided polyhedron is the X-axis display value of the autocollimator;

[0022] 4】the processing unit calculates the measurement error ei of the angle position of the measuring point of the rotary table to be measured according to the rotation angle θi of the rotary table to be measured, the X-axis display value ai of the autocollimator and the correction value bi of the working surface of the regular 23-face pyramid, until the rotary table to be measured rotates one circle, and the measurement errors of the angle positions of 23 measuring points are obtained;

[0023] 5】the processing unit calculates the angle position measurement precision of the rotary table to be measured according to the maximum value and the minimum value in the measurement errors of the angle positions of 23 measuring points, and the automatic detection of the angle position measurement precision of the rotary table is completed.

[0024] Further, step 1】 is specifically:

[0025] 1.1, power on the rotary table to be measured and position it to 0° and keep;

[0026] 1.2, turn on the autocollimator, and make the autocollimator collimate with the 1st working surface of the regular 23-face pyramid;

[0027] 1.4, drive the rotary table to be measured to rotate to the 1st working surface, the 7th working surface, the 13th working surface and the 19th working surface through the electric two-dimensional adjustment mechanism and the tool shaft, and simultaneously collect the Y-axis readings of the corresponding working surfaces by using the autocollimator to obtain Y1, Y7, Y13 and Y19;

[0028] 1.5, the processing unit calculates the adjustment amount Δα and Δβ of the α-axis and the β-axis according to the Y-axis readings Y1, Y7, Y13 and Y19;

[0029] 1.6, judge whether the absolute values of Δα and Δβ are greater than 60 angular seconds at the same time:

[0030] If yes, the processing unit adjusts the α-axis and the β-axis according to the adjustment amount Δα and Δβ, and returns to step 1.4; if not, the automatic detection device of the angle position measurement precision of the rotary table is calibrated.

[0031] Further, step 1.5 is specifically:

[0032] The processing unit calculates the adjustment amount Δα and Δβ of the α-axis and the β-axis of the electric two-dimensional adjustment mechanism according to the Y-axis readings Y1, Y7, Y13 and Y19 by the following formula:

[0033]

[0034] Further, step 4】 is specifically:

[0035] The processing unit calculates the measurement error ei of the angle position of the measuring point of the rotary table to be measured according to the rotation angle value θi of the rotary table to be measured, the X-axis display value ai of the autocollimator 9 and the correction value bi of the working surface of the regular 23-face pyramid;

[0036]

[0037] Wherein, the rotation angle of the to-be-tested rotary table increases in the same direction as the X-axis positive direction of the autocollimator, the sign before ai is +, and vice versa.

[0038] Further, the step 5 is specifically:

[0039] The processing unit calculates the angle position measurement accuracy e of the to-be-tested rotary table according to the maximum value ei max and the minimum value ei min of the 23 measuring point angle position measurement errors through the following formula:

[0040]

[0041] The rotary table angle position measurement accuracy automatic detection is completed.

[0042] The present application has the following beneficial effects:

[0043] 1. The rotary table angle position measurement accuracy automatic detection device, the 23-sided regular polyhedron is a standard part, the 23 sides are all reflective surfaces, i.e. working surfaces, the normal line of the adjacent two working surfaces has an angle of 360° / 23, the device can automatically calibrate the to-be-tested rotary table; the synchronous sampling unit can trigger the autocollimator and the to-be-tested rotary table at the same time, and the synchronous acquisition can be stored in the processing unit; according to the corresponding instructions of the processing unit, the alpha axis and beta axis of the electric two-dimensional adjustment mechanism are rotated by a specified adjustment amount, and finally the non-parallelism (tilt) between the rotary axis of the 23-sided regular polyhedron and the rotary axis of the to-be-tested rotary table is automatically adjusted to a controllable range that does not affect the measurement accuracy, and the dynamic angle position measurement accuracy detection is realized.

[0044] 2. The rotary table angle position measurement accuracy automatic detection device, each component part can be independently tested in the measurement and verification department, and the accuracy and fairness of the device detection test can be ensured.

[0045] 3. The rotary table angle position measurement accuracy automatic detection device, after self-calibration, the adjustment is convenient, the detection is fast and reliable, and the repeatability is high.

[0046] 4. The rotary table angle position measurement accuracy automatic detection device, only the synchronous sampling device needs to have a sampling function, the acquisition delay is not more than 1ms, the implementation is easy, and the operability is high.

[0047] 5. The rotary table angle position measurement accuracy automatic detection method, the synchronous sampling unit, the processing unit and the autocollimator can objectively, accurately and quickly detect the angle position measurement accuracy of the to-be-tested rotary table.

[0048] 6、The automatic detection method for the rotary table angular position measurement precision can detect the dynamic angular position measurement precision (i.e. the precision in the rotating process), and the previous method can only detect the static angular position measurement precision.

[0049] 7、The automatic detection method for the rotary table angular position measurement precision can be automatically adjusted throughout the process, and the adjustment speed depends on the time for the regular 23-face prism to rotate through 4 sampling faces, while the traditional method needs to manually adjust the 23 working faces of the regular 23-face prism, and needs to stop and record the angle between the measured rotary table and the autocollimator when rotating each working face, and the test speed completely depends on the alignment speed of the operator in manually aligning each face to adjust the collimation error, and when the dynamic angular measurement precision of the measured rotary table is to be measured, it is even more difficult to measure; when the autocollimator is used for monitoring or the dial gauge is used for detection, there is no effective universal method, and the adjustment speed and accuracy completely depend on the technical level of the operator; compared with the traditional method, the method of the present application completes the detection of the one-time angular measurement precision of the measured rotary table through self-calibration and automatic detection, and greatly improves the work efficiency.

[0050] 8、The automatic detection method for the rotary table angular position measurement precision does not need the autocollimator to have a high sampling rate, and only needs to record the current sampling value after receiving the trigger signal. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is a structural schematic view of an embodiment of the automatic detection device for the rotary table angular position measurement precision.

[0052] MARKS FOR EXPLANATION:

[0053] 1-fixture shaft, 2-regular 23-face prism, 3-electric two-dimensional adjustment mechanism, 4-alpha axis, 5-beta axis, 6-measured rotary table, 7-synchronous sampling unit, 8-processing unit, 9-autocollimator. DETAILED DESCRIPTION

[0054] As Figure 1 described, an automatic detection device for the rotary table angular position measurement precision comprises a synchronous sampling unit 7, a processing unit 8, an autocollimator 9, a fixture shaft 1, a regular 23-face prism 2 and an electric two-dimensional adjustment mechanism 3; the regular 23-face prism 2 is sleeved on the fixture shaft 1, and its working face is oppositely arranged with the autocollimator 9; the internal center of the electric two-dimensional adjustment mechanism 3 is arranged with an alpha axis 4 and a beta axis 5 on the same horizontal plane, for adjusting the rotation angles of the electric two-dimensional adjustment mechanism 3 along the alpha axis 4 and the beta axis 5 respectively; the upper surface of the electric two-dimensional adjustment mechanism 3 is vertically fixedly connected with the fixture shaft 1, and the lower surface is coaxially fixedly connected with the upper surface of the measured rotary table 6.

[0055] The synchronous sampling unit 7 is respectively connected in communication with the to-be-tested rotary table 6, the processing unit 8 and the autocollimator 9, the autocollimator 9 is used to collect the rotation angle of the regular 23-face polyhedron 2 when receiving the trigger signal sent by the synchronous sampling unit 7; the synchronous sampling unit 7 is used to collect the rotation angle of the to-be-tested rotary table 6, and sends a trigger signal to the autocollimator 9 when the to-be-tested rotary table 6 rotates to the working angle of the regular 23-face polyhedron 2 (the angle of each working face of the regular 23-face polyhedron 2 is 360° / 23), and sends the rotation angle of the to-be-tested rotary table 6 and the rotation angle of the regular 23-face polyhedron 2 collected by the autocollimator 9 to the processing unit 8; the processing unit 8 is used to adjust the α-axis 4 and the β-axis 5 according to the rotation angle of the to-be-tested rotary table 6 and the rotation angle of the regular 23-face polyhedron 2, so that the tower difference between the rotation axes of the regular 23-face polyhedron 2 and the to-be-tested rotary table 6 is minimized, that is, the α-axis 4 and the β-axis 5 are used to adjust the non-parallelism between the rotation axes of the regular 23-face polyhedron 2 and the to-be-tested rotary table 6, that is, the tower difference.

[0056] Preferably, the central axis of the tool shaft 1 coincides with the central axis of the to-be-tested rotary table 6; the electric two-dimensional adjustment mechanism 3 is a commercially available product, the rotation range of which is not less than ±1°, and the adjustment resolution is not greater than 10 arc seconds, which can improve the tower difference adjustment accuracy and speed; the collection delay of the synchronous sampling unit 7 is not greater than 1ms, since the angle output frequency of most to-be-tested rotary tables 6 is 1kHz, therefore, the collection delay of not greater than 1ms can ensure that the rotation angle of the to-be-tested rotary table 6 collected at the current time and the rotation angle of the regular 23-face polyhedron 2 collected by the autocollimator 9 are data at the same time.

[0057] The to-be-tested rotary table 6 is driven to start one-way continuous rotation, and the synchronous sampling unit 7 is used to collect the rotation angle of the regular 23-face polyhedron 2 when the regular 23-face polyhedron 2 rotates to the 1st working face, the 7th working face, the 13th working face and the 19th working face, and the corresponding rotation angle value of the to-be-tested rotary table 6 and the Y-axis reading of the rotation angle of the regular 23-face polyhedron 2 collected by the autocollimator 9. The processing unit 8 calculates the adjustment amount of the α-axis 4 and the β-axis 5 of the electric two-dimensional adjustment mechanism 3 according to the collected Y-axis reading of the autocollimator 9, until the adjustment amount is not greater than 60 arc seconds at the same time, that is, the adjustment is completed (according to the research results of related literatures, generally, the tower difference is adjusted to within 300 arc seconds, that is, the error caused by the tower difference can be controlled within 0.5 arc seconds. Since the working face of the regular 23-face polyhedron 2 is small and the field of view of the autocollimator 9 is limited, in order to ensure that there is a reading in the field of view of the autocollimator 9 when the regular 23-face polyhedron 2 rotates to other working faces, the tower difference is as small as possible, and the adjustment accuracy of 60 arc seconds can better meet the control and timeliness requirements).

[0058] After the adjustment, the first working face of the regular 23-face prism 2 is self-aligned with the autocollimator 9, and the detection of the angular position measurement accuracy of the tested rotary table 6 is started. The tested rotary table 6 is driven to rotate continuously in one direction at the rated speed, and when the synchronous sampling unit 7 monitors that the rotation angle θi of the tested rotary table 6 rotates to the working angle of the regular 23-face prism 2, the synchronous sampling unit 7 generates a trigger signal and sends the trigger signal to the tested rotary table 6 and the autocollimator 9, until the tested rotary table 6 rotates one round, and then the rotation angle collected is used to calculate the angular position measurement accuracy of the tested rotary table 6.

[0059] Each component of the present application can be independently periodically calibrated in a metrological verification department, and the accuracy and fairness of the detection and test of the present application device are ensured.

[0060] Meanwhile, the present application also provides an automatic detection method for the angular position measurement accuracy of a rotary table, which comprises the following steps:

[0061] 1】Prepare the automatic detection device for the angular position measurement accuracy of a rotary table, and perform self-calibration on the automatic detection device, specifically as follows:

[0062] 1.1, power on the tested rotary table 6 and position the tested rotary table 6 to 0° and keep;

[0063] 1.2, turn on the autocollimator 9, and make the autocollimator 9 self-aligned with the first working face of the regular 23-face prism 2, and the autocollimator 9 has readings on the X axis and the Y axis;

[0064] 1.4, drive the tested rotary table 6 to rotate to the first working face, the seventh working face, the thirteenth working face and the nineteenth working face through the electric two-dimensional adjustment mechanism 3 and the tool shaft 1, and drive the regular 23-face prism 2, and simultaneously collect the Y axis readings of the corresponding working faces by using the autocollimator 9 to obtain Y1, Y7, Y13 and Y19;

[0065] 1.5, the processing unit 8 calculates the adjustment amounts Δα and Δβ of the α axis 4 and the β axis 5 according to the Y axis readings Y1, Y7, Y13 and Y19:

[0066]

[0067]

[0068] 1.6, judge whether the absolute values of Δα and Δβ are greater than 60 angular seconds at the same time:

[0069] If yes, the processing unit 8 adjusts the α axis 4 and the β axis 5 according to the calculated adjustment amounts Δα and Δβ, and returns to step 1.4; if no, the self-calibration of the automatic detection device for the angular position measurement accuracy of a rotary table is ended.

[0070] 2】Position the test rotary table 6 at 0°, collimate the first working face of the regular 23-face prism 2 with the autocollimator 9, and make the X-axis reading and Y-axis reading of the autocollimator 9 show zero;

[0071] 3】Drive the test rotary table 6 to rotate at its rated speed, and in the process of rotation, monitor the rotation angle ai of the regular 23-face prism 2 in real time with the autocollimator 9, and monitor the rotation angle θi of the test rotary table 6 in real time with the synchronous sampling unit 7;

[0072] When the synchronous sampling unit 7 monitors that the rotation angle θi of the test rotary table 6 rotates to the working angle of the regular 23-face prism, the synchronous sampling unit 7 generates a trigger signal and sends it to the autocollimator 9, the autocollimator 9 sends the rotation angle ai of the regular 23-face prism 2 at this moment to the synchronous sampling unit 7, and the synchronous sampling unit 7 sends the rotation angle θi of the test rotary table 6 at this moment and the rotation angle ai of the regular 23-face prism 2 to the processing unit 8; i represents the working face number of the regular 23-face prism 2, i = 1, 2, 3…23; the rotation angle ai of the regular 23-face prism 2 is the X-axis display value of the autocollimator 9;

[0073] In this embodiment, the theoretical angle error between the current working face of the regular 23-face prism 2 and the next working face is ±100 angular seconds, in order to improve the measurement accuracy and the fault tolerance rate of the alignment of each working face of the regular 23-face prism 2 and the autocollimator 9.

[0074] 4】The processing unit 8 calculates the measurement error ei of the angular position of the test point of the test rotary table 6 according to the rotation angle value θi of the test rotary table 6, the X-axis display value ai of the autocollimator 9 and the correction value bi of the working face of the regular 23-face prism 2:

[0075]

[0076] In the formula, the correction value bi of each working face of the regular 23-face prism 2 is verified by the superior measurement mechanism and is a known item; when the rotation angle of the test rotary table 6 increases in the same direction as the positive direction of the X-axis of the autocollimator 9, the sign before ai is +, otherwise it is -;

[0077] 5】The processing unit 8 calculates the angular position measurement accuracy e of the test rotary table 6 according to the maximum value ei max and the minimum value ei min of the 23 angular position measurement errors of the test point:

[0078]

[0079] The automatic detection of the angular position measurement accuracy of the rotary table is completed.

[0080] The present application gimbals angular position measurement precision automatic detection method, without autocollimator 9 has high sampling rate, only need to receive the trigger signal after the current sampling value record, and only need to synchronize the sampling unit 7 Collection delay is less than 1 ms, easy to realize, high operability, the method through self-calibration, automatic detection completes the detection of the once angle measurement precision of the measured turntable 6, greatly improves the work efficiency.

Claims

1. A device for automatically detecting the measurement accuracy of the angular position of a turntable, characterized in that it comprises: It comprises a synchronous sampling unit (7), a processing unit (8), a autocollimator (9) and a tool shaft (1), a regular 23-face pyramid (2) and a motorized two-dimensional adjustment mechanism (3). The regular 23-face pyramid (2) is sleeved on the tool shaft (1) and its working face is arranged opposite to the autocollimator (9). The inner center of the motorized two-dimensional adjustment mechanism (3) is arranged on the same horizontal plane and provided with mutually perpendicular alpha axis (4) and beta axis (5) for adjusting the rotation angle of the motorized two-dimensional adjustment mechanism (3) along the alpha axis (4) and the beta axis (5) respectively; the upper surface center of the motorized two-dimensional adjustment mechanism (3) is vertically fixedly connected with the tool shaft (1) and the lower surface is coaxially fixedly connected with the upper surface of the measured turntable (6); the alpha axis (4) and the beta axis (5) are respectively in communication connection with the processing unit (8). The synchronous sampling unit (7) is in communication connection with the measured turntable (6), the processing unit (8) and the autocollimator (9) respectively; the autocollimator (9) is used for collecting the rotation angle of the regular 23-face pyramid (2) when receiving the trigger signal sent by the synchronous sampling unit (7); the synchronous sampling unit (7) is used for collecting the rotation angle of the measured turntable (6) and sending the trigger signal to the autocollimator (9) when the measured turntable (6) rotates to the working angle of the regular 23-face pyramid (2) and packs and sends the rotation angle of the measured turntable (6) and the rotation angle of the regular 23-face pyramid (2) collected by the autocollimator (9) to the processing unit (8); the processing unit (8) is used for adjusting the alpha axis (4) and the beta axis (5) according to the rotation angle of the measured turntable (6) and the rotation angle of the regular 23-face pyramid (2) so that the difference between the rotation axes of the regular 23-face pyramid (2) and the measured turntable (6) is minimum.

2. The automatic detection device for measuring the accuracy of the angular position of a rotary table according to claim 1, characterized in that: The included angle error between the adjacent working angles of the regular 23-face pyramid (2) is ±100 angular seconds.

3. The automatic detection device for measuring the accuracy of the angular position of a rotary table according to claim 2, characterized in that: The rotation range of the motorized two-dimensional adjustment mechanism (3) is not less than ±1° and the adjustment resolution is not greater than 10 angular seconds.

4. The automatic detection device for the angular position measurement accuracy of a turntable according to any one of claims 1 to 3, characterized in that: The collection delay of the synchronous sampling unit (7) is not greater than 1 ms.

5. A method for automatically detecting the accuracy of a rotary table angular position measurement, characterized in that, It comprises the following steps:

1. Preparing the automatic detection device for the angular position measurement accuracy of a turntable according to any one of claims 1 to 4 and self-calibrating it; 2. Positioning the measured turntable (6) at 0°, self-aligning the autocollimator (9) with the first working face of the regular 23-face pyramid (2) and clearing the reading values of the X-axis and Y-axis readings of the autocollimator (9); 3. Driving the measured turntable (6) to rotate at its rated speed, in the process of rotation, using the autocollimator (9) to monitor the rotation angle ai of the regular 23-face pyramid (2) in real time and using the synchronous sampling unit (7) to monitor the rotation angle θi of the measured turntable (6) in real time; When the synchronous sampling unit (7) monitors that the rotation angle θi of the test rotary table (6) rotates to the working angle of the positive 23-face prism (2), the synchronous sampling unit (7) generates a trigger signal and sends it to the autocollimator (9), the autocollimator (9) sends the rotation angle ai of the positive 23-face prism (2) at this moment to the synchronous sampling unit (7), and the synchronous sampling unit (7) packs and sends the rotation angle θi of the test rotary table (6) and the rotation angle ai of the positive 23-face prism (2) at this moment to the processing unit (8); i represents the working face number of the positive 23-face prism (2), i = 1, 2, 3…23; the rotation angle ai of the positive 23-face prism (2) is the X-axis display value of the autocollimator (9); 4】The processing unit (8) calculates the measurement error ei of the test point angle position of the test rotary table (6) according to the rotation angle θi of the test rotary table (6), the X-axis display value ai of the autocollimator (9) and the correction value bi of the working face of the positive 23-face prism (2), until the test rotary table (6) rotates one revolution, and the measurement errors of 23 test point angle positions are obtained; 5】The processing unit (8) calculates the angle position measurement accuracy of the test rotary table (6) according to the maximum and minimum values in the 23 test point angle position measurement errors, and completes the automatic detection of the rotary table angle position measurement accuracy.

6. The method of claim 5, wherein the method further comprises: Step 1】is specifically: 1.1, power on the test rotary table (6) and position it to 0° and keep; 1.2, turn on the autocollimator (9), so that the autocollimator (9) is aligned with the first working face of the positive 23-face prism (2); 1.4, drive the test rotary table (6) to rotate to the first working face, the seventh working face, the thirteenth working face and the nineteenth working face through the electric two-dimensional adjustment mechanism (3) and the tool shaft (1) to drive the positive 23-face prism (2), and at the same time, use the autocollimator (9) to collect the Y-axis readings of the corresponding working faces to obtain Y1, Y7, Y13 and Y19; 1.5, the processing unit (8) calculates the adjustment amount Δα, Δβ of the α-axis (4) and the β-axis (5) according to the Y-axis readings Y1, Y7, Y13 and Y19; 1.6, judge whether the absolute values of Δα and Δβ are greater than 60 angular seconds at the same time: If yes, the processing unit (8) adjusts the α-axis (4) and the β-axis (5) according to the adjustment amount Δα and Δβ, and returns to step 1.4; if not, the rotary table angle position measurement accuracy automatic detection device is calibrated.

7. The method of claim 6, wherein the method further comprises: Step 1.5 is specifically: The processing unit (8) calculates the adjustment amount Δα, Δβ of the α-axis (4) and the β-axis (5) of the electric two-dimensional adjustment mechanism (3) according to the Y-axis readings Y1, Y7, Y13 and Y19 through the following formula:

8. The method of claim 7, wherein the method further comprises: Step 4】is specifically: The processing unit (8) calculates the measurement error ei of the test point angle position of the test rotary table (6) according to the rotation angle value θi of the test rotary table (6), the X-axis display value ai of the autocollimator (9) and the correction value bi of the working face of the positive 23-face prism (2): Wherein, when the rotation angle increasing direction of the test rotary table (6) is consistent with the positive direction of the X-axis of the autocollimator (9), the sign before ai is +, otherwise it is -.

9. The method of claim 8, wherein the method further comprises: Step 5】is specifically: Processing unit (8) calculates the maximum value ei from the angular position measurement errors of the 23 measuring points. max and minimum value ei min The angular position measurement accuracy e of the turntable (6) under test is calculated using the following formula: Complete the automatic detection of the rotary table angle position measurement accuracy.

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