Method for detecting axis perpendicularity of large-scale UT structure double-shaft turntable

Abstract

The invention discloses a method for detecting the axis perpendicularity of a large UT structure double-shaft rotary table, and mainly relates to the technical field of the axis perpendicularity of a double-shaft rotary table. The large UT structure double-shaft rotary table comprises an outer frame left support and an outer frame right support which are supported by a plurality of equal-height block tools, and further comprises an outer frame base, a pitching right shaft, a right bearing seat assembly, an inner frame framework and a pitching left shaft; plane mirrors need to be installed in multiple directions, and a photoelectric autocollimator needs to be horizontally placed at the position on the rotary table vibration isolation foundation. According to the invention, the axis perpendicularity can be detected more simply, and the assembly efficiency can be improved.

Description

Technical Field

[0001] The invention mainly relates to the technical field of verticality of the axis of a double-axis turntable, and in particular to a method for detecting the verticality of the axis of a double-axis turntable of a large UT structure. Background Art

[0002] The conventional detection method for the verticality of the azimuth and pitch axes of the UT structure dual-axis turntable is as follows: place the photoelectric autocollimator horizontally, install an adjustable double-sided reflector at the center of the azimuth axis end of the inner frame, rotate the pitch axis to align one side of the double-sided reflector with the photoelectric autocollimator, adjust the positions of the photoelectric autocollimator and the double-sided reflector to align the optical axis with the azimuth axis, and make the mirror surface perpendicular to the azimuth axis; rotate the azimuth axis 360° at 45° intervals, and record 8 readings of the photoelectric autocollimator at each corresponding angular position of the azimuth axis; then rotate the pitch axis 180° to align the photoelectric autocollimator with the other side of the double-sided reflector, rotate the azimuth axis again 360° at 45° intervals, and record another 8 readings of the photoelectric autocollimator at each corresponding angular position of the azimuth axis; finally, substitute the 16 readings into the standard formula to calculate the verticality detection values ​​of the two axes.

[0003] However, when a large UT structure dual-axis turntable uses the above method to detect the verticality of the two axes, a large amount of counterweights need to be added for balancing, and the installation of a large-diameter table will cause interference with the bottom surface of the outer frame. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the above-mentioned problems, the present invention needs to provide a method for detecting the verticality of the axis of a large-scale UT structure dual-axis turntable, which can more simply detect the verticality.

[0005] (II) Technical solution In view of the above technical problems, the present invention provides a method for detecting the verticality of the axis of a large-scale UT structure dual-axis turntable, comprising the following steps: Step 1: Installation and inspection of the pitch axis system: Use multiple equal-height block fixtures to support the outer frame left bracket and the outer frame right bracket, use studs to pass through the center holes of the equal-height block fixtures, and fix the outer frame left bracket and the outer frame right bracket on the outer frame base, install the pitch right axis and the right bearing seat assembly on the outer frame right bracket, hoist the inner frame in the middle of the outer frame left bracket and the outer frame right bracket, install the pitch left axis and the left bearing seat assembly on the outer frame left bracket, and install the pitch left axis and the pitch right axis on the inner frame; Step 2: Adjust the position of the plane mirror: install the adjustable plane mirror at the center of the end face of the left pitch axis, place the photoelectric autocollimator horizontally on the vibration isolation base of the turntable, rotate the measured axis, adjust the position of the photoelectric autocollimator and the plane mirror, align the optical axis with the pitch axis, and make the mirror surface perpendicular to the pitch axis; Step 3: Azimuth axis system inspection and installation: install the azimuth axis, azimuth bearing seat assembly, and azimuth lower bearing bracket on the inner frame. The azimuth axis and the pitch axis intersect horizontally. Two jacks support the front and rear circumferential tangent points below the inner frame respectively. Step 4: Adjust the position of the plane mirror: install the adjustable plane mirror at the center of the end face of the azimuth axis, place the photoelectric autocollimator horizontally on the vibration isolation base of the turntable, rotate the measured axis, adjust the position of the photoelectric autocollimator and the plane mirror, and adjust the front and rear jacks to make the azimuth axis horizontal, the optical axis and the azimuth axis aligned, and the mirror surface perpendicular to the azimuth axis; Step 5. Measure the horizontal angle of the azimuth axis: put the electronic theodolite in position, put the multi-tooth indexing table in position, and then put the plane mirror on the multi-tooth indexing table, measure the horizontal angle of the azimuth axis and record it; Step 6: Rotate the multi-tooth indexing table counterclockwise to make the plane mirror in the direction indicated by the double-dotted line, and record the angle of the multi-tooth indexing table; Step 7: Measure the horizontal angle of the pitch axis: Move the electronic theodolite to the position, measure the horizontal angle of the pitch axis and record it; Step 8. Calculate the verticality of the two axes: Angle = 360° - [horizontal angle of azimuth axis + rotation angle of multi-tooth indexing table + horizontal angle of pitch axis]; Angle -90° is the perpendicularity of the two axes.

[0006] Furthermore, in step one, a plurality of counterweights need to be installed to balance the inner frame.

[0007] Furthermore, during the azimuth axis system inspection and installation in step three, after the azimuth axis system is installed, the inner frame and the azimuth axis system assembly are no longer balanced.

[0008] Furthermore, in step five, the horizontal angle of the azimuth axis is measured, the position and orientation of the plane mirror are fine-tuned, an electronic theodolite is used to find the plane mirror and the reflected cross image of the plane mirror respectively, and the back-measurement method is used to measure and calculate the horizontal angle between the azimuth axis and the normal of the plane mirror surface.

[0009] Furthermore, in step seven, the horizontal angle of the pitch axis is measured, the position of the electronic theodolite is adjusted, the plane mirror and the reflected cross image of the plane mirror are found respectively, and the horizontal angle between the pitch axis and the normal of the plane mirror surface is measured and calculated using the backsight method.

[0010] Compared with the prior art, the invention has the following beneficial effects: the method is simple and reliable, can meet the assembly technical index detection requirement of axis verticality ±5″, does not need to add a large number of counterweights for balancing, and saves production costs. At the same time, the positive and negative values ​​of the calculation results of the verticality of the two axes provide intuitive deviation amounts and deviation directions for out-of-tolerance adjustment, and improves assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the detection principle of the present invention.

[0012] Figure 2 It is a schematic diagram of the structure of the large-scale UT structure dual-axis turntable of the present invention.

[0013] Figure 3 It is a schematic diagram of the detection state of the present invention.

[0014] Figure numbers: 1 plane mirror; 2 plane mirror; 3 plane mirror; 4 azimuth axis; 5 pitch axis; 6 electronic theodolite; 7 multi-tooth indexing table; 8 position; 9 position; 10 position; 11 horizontal angle of azimuth axis; 12 rotation angle of multi-tooth indexing table; 13 horizontal angle of pitch axis; 14 angle; 15 left bearing seat assembly; 16 left pitch axis; 17 inner frame; 18 table; 19 azimuth axis; 20 azimuth bearing seat assembly; 21 right pitch axis; 22 right bearing seat assembly; 23 left outer frame bracket; 24 lower azimuth bearing bracket; 25 counterweight plate; 26 outer frame base; 27 right outer frame bracket; 28 equal height block tooling; 29 counterweight weights; 30 jack. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with specific embodiments. The present invention is explained by means of the illustrative embodiments and descriptions of the present invention, but is not intended to be limiting of the present invention.

[0016] Example: Figure 1-Figure 3 A method for detecting the verticality of the axis of a large UT structure dual-axis turntable is shown, comprising the following steps: Step 1, inspection and installation of the pitch axis system: use multiple equal-height block fixtures 28 to support the outer frame left bracket 23 and the outer frame right bracket 27, use studs to pass through the center holes of the equal-height block fixtures 28, and fix the outer frame left bracket 23 and the outer frame right bracket 27 on the outer frame base 26. The studs are commonly used parts in the prior art. Install the pitch right axis 21 and the right bearing seat assembly 22 on the outer frame right bracket 27, hang the inner frame 17 in the middle of the outer frame left bracket 23 and the outer frame right bracket 27, install the pitch left axis 16 and the left bearing seat assembly 15 on the outer frame left bracket 23, and install the pitch left axis 16 and the pitch right axis 21 on the inner frame 17.

[0017] Step 2. Adjust the position of the plane mirror 2: Install the adjustable plane mirror 2 at the center of the end face of the left pitch axis 16, place the photoelectric autocollimator horizontally at position 10 on the turntable vibration isolation foundation, then rotate the measured axis, adjust the position of the photoelectric autocollimator and the plane mirror 2, so that the optical axis is aligned with the pitch axis 5, and the mirror surface is perpendicular to the pitch axis 5.

[0018] Step 3: azimuth axis system inspection and installation: install the azimuth axis 19, azimuth bearing seat assembly 20, and azimuth lower bearing bracket 24 on the inner frame 17, with the azimuth axis 4 and the pitch axis 5 intersecting horizontally, and two jacks 30 supporting the front and rear circular tangent points below the inner frame 17 respectively.

[0019] Step 4. Adjust the position of the plane mirror 1: Install the adjustable plane mirror 1 at the center of the end face of the azimuth axis 19, place the photoelectric autocollimator horizontally at position 8 on the turntable vibration isolation foundation, then rotate the measured axis, adjust the position of the photoelectric autocollimator and the plane mirror 1, and adjust the front and rear jacks 30 to make the azimuth axis 4 horizontal, the optical axis is aligned with the azimuth axis 4, and the mirror surface is perpendicular to the azimuth axis.

[0020] Step 5, measure the horizontal angle 11 of the azimuth axis: place the electronic theodolite 6 at position 8, the multi-tooth dividing table 7 at position 9, and then place the plane mirror 3 on the multi-tooth dividing table 7, measure the angle of the horizontal angle 11 of the azimuth axis and record it.

[0021] Step 6: Rotate the multi-tooth indexing table 7 counterclockwise to make the plane mirror 3 in the direction indicated by the double-dotted line, and record the angle of the multi-tooth indexing table angle 12, which is about 90°.

[0022] Step 7, measuring the horizontal angle 13 of the pitch axis: move the electronic theodolite 6 to position 10, measure the horizontal angle 13 of the pitch axis and record it.

[0023] Step 8. Calculate the verticality of the two axes: Angle 14 = 360° - [horizontal angle of azimuth axis 11 + rotation angle of multi-tooth dividing table 12 + horizontal angle of pitch axis 13]; Angle 14-90° is the perpendicularity of the two axes.

[0024] In step one, a plurality of counterweights 29 are installed to balance the inner frame 17; and the table 18 and the counterweight plate 25 are not installed, and the azimuth axis 19, the azimuth bearing seat assembly 20, and the azimuth lower bearing bracket 24 of the azimuth axis system are not installed temporarily.

[0025] In step three, the azimuth axis system is inspected and installed. After the azimuth axis system is installed, the inner frame 17 and the azimuth axis system assembly are no longer balanced.

[0026] In step five, the horizontal angle 11 of the azimuth axis is measured, the position and orientation of the plane mirror 3 are fine-tuned, the electronic theodolite 6 is used to find the reflected cross images of the plane mirror 1 and the plane mirror 3 respectively, and the back-measurement method is used to measure and calculate the horizontal angle between the azimuth axis and the mirror normal of the plane mirror 3.

[0027] In step seven, the horizontal angle 13 of the pitch axis is measured, the position of the electronic theodolite 6 is adjusted, the reflected cross images of the plane mirror 2 and the plane mirror 3 are found respectively, and the horizontal angle between the pitch axis and the normal line of the plane mirror 3 is measured and calculated by the back-measurement method.

[0028] The present invention provides a method for detecting the verticality of the axes of a large-scale UT structure dual-axis turntable. The detection method is also applicable to the verticality detection of the axes of a large-scale dual-axis turntable with a similar structure. The present invention installs two adjustable plane mirrors on the center positions of the end faces of the pitch left axis and the azimuth axis respectively, and then places another adjustable plane mirror on a multi-tooth dividing table, rotates the multi-tooth dividing table, uses an electronic theodolite to measure the horizontal angle of the azimuth axis and the horizontal angle of the pitch axis, and calculates the verticality of the two axes.

[0029] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A method for detecting the verticality of the axis of a large UT structure dual-axis turntable, characterized in that: The following steps are involved: Step 1: Testing and installing the pitch axis system: Use a plurality of equal height block fixtures (28) to support the outer frame left bracket (23) and the outer frame right bracket (27), and use studs to pass through the center holes of the equal height block fixtures (28) to fix the outer frame left bracket (23) and the outer frame right bracket (27) on the outer frame base (26), install the pitch right axis (21) and the right bearing seat assembly (22) on the outer frame right bracket (27), hang the inner frame (17) in the middle of the outer frame left bracket (23) and the outer frame right bracket (27), install the pitch left axis (16) and the left bearing seat assembly (15) on the outer frame left bracket (23), and install the pitch left axis (16) and the pitch right axis (21) on the inner frame (17); Step 2, aligning the position of the plane mirror (2): installing the adjustable plane mirror (2) at the center of the end face of the pitch left axis (16), horizontally placing the photoelectric autocollimator at the position (10) on the vibration isolation base of the turntable, rotating the axis to be measured, adjusting the position of the photoelectric autocollimator and the plane mirror (2) so that the optical axis is aligned with the pitch axis (5), and the mirror surface is perpendicular to the pitch axis (5); Step 3: Azimuth axis system inspection and installation: install the azimuth axis (19), the azimuth bearing seat assembly (20), and the azimuth lower bearing bracket (24) on the inner frame (17), the azimuth axis (4) and the pitch axis (5) intersect horizontally, and two jacks (30) support the front and rear circumferential tangent points below the inner frame (17) respectively; Step 4, aligning the position of the plane mirror (1): Install the adjustable plane mirror (1) at the center of the end face of the azimuth axis (19), horizontally place the photoelectric autocollimator at position (8) on the vibration isolation base of the turntable, rotate the measured axis, adjust the positions of the photoelectric autocollimator and the plane mirror (1), and adjust the front and rear jacks (30) so that the azimuth axis (4) is horizontal, the optical axis is aligned with the azimuth axis (4), and the mirror surface is perpendicular to the azimuth axis; Step 5, measuring the horizontal angle (11) of the azimuth axis: placing the electronic theodolite (6) at position (8), placing the multi-tooth indexing table (7) at position (9), and then placing the plane mirror (3) on the multi-tooth indexing table (7), measuring the angle of the horizontal angle (11) of the azimuth axis and recording it; Step 6: Rotate the multi-tooth indexing table (7) counterclockwise so that the plane mirror (3) is in the direction indicated by the double-dotted line, and record the angle of the multi-tooth indexing table rotation angle (12); Step 7, measuring the horizontal angle (13) of the pitch axis: move the electronic theodolite (6) to position (10), measure the horizontal angle (13) of the pitch axis and record it; Step 8. Calculate the verticality of the two axes: Angle (14) = 360° - [horizontal angle of azimuth axis (11) + rotation angle of multi-tooth indexing table (12) + horizontal angle of elevation axis (13)]; The angle (14) - 90° is the perpendicularity of the two axes.

2. The method for detecting the verticality of the axis of a large UT structure dual-axis turntable according to claim 1 is characterized in that: In step one, a plurality of counterweights (29) are installed to balance the inner frame (17).

3. The method for detecting the verticality of the axis of a large UT structure dual-axis turntable according to claim 1 is characterized in that: In step 3, the azimuth shaft system is inspected and installed. After the azimuth shaft system is installed, the inner frame (17) and the azimuth shaft system assembly are no longer balanced.

4. The method for detecting the verticality of the axis of a large UT structure dual-axis turntable according to claim 1 is characterized in that: In step 5, the horizontal angle (11) of the azimuth axis is measured, the position and orientation of the plane mirror (3) are finely adjusted, and the reflected cross images of the plane mirror (1) and the plane mirror (3) are respectively found using an electronic theodolite (6). The horizontal angle between the azimuth axis and the normal line of the plane mirror (3) is measured and calculated using the back-measurement method.

5. The method for detecting the verticality of the axis of a large UT structure dual-axis turntable according to claim 1 is characterized in that: In step seven, the horizontal angle (13) of the pitch axis is measured, the position of the electronic theodolite (6) is adjusted, the reflected cross images of the plane mirror (2) and the plane mirror (3) are found respectively, and the horizontal angle between the pitch axis and the normal line of the plane mirror (3) is measured and calculated by the back-measurement method.

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