Small antenna pedestal for testing assembly capability of bench worker

Abstract

An existing small antenna pedestal structural member is still large in weight and size, complex in structure, high in cost, inconvenient to quickly assemble and adjust, inconvenient to measure the assembly precision and not suitable for being used as a device for testing the skill of an assembly bench worker. The invention provides a radar antenna pedestal which is light, economical and easy to operate and manually adjust, comprises an azimuth assembly platform, an azimuth gear transmission combination, a pitching antenna pedestal combination and an array plane combination, and can be used for testing assembly and metering measurement capabilities of equal-height adjustment, gear transmission meshing, bearing assembly clearance elimination, positioning pin matching and the like of a bench worker. The assembling process needs to be similar to a pitching azimuth radar antenna pedestal, equal-height adjustment is needed, assembling actions such as gear transmission, bearing assembling clearance elimination and positioning pin matching are included, and geometric errors such as coaxiality, end face, radial circle run-out, gear meshing backlash and planeness of all transmission parts of the antenna pedestal can be conveniently measured through a lever dial indicator.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical structures, and particularly relates to a small antenna pedestal for testing the fitting ability of fitters. Background Art

[0002] The transmission accuracy of a radar has a great influence on its working accuracy. When the radar is working, it is required that the azimuth and elevation rotations are stable. For a radar array with requirements of being erected upside down and folded, high requirements are also put forward for the coaxiality of the ear mounting holes. Therefore, at the stage of radar general assembly, fitters are required to have relatively high fitting skills and be proficient in using a lever dial indicator. Thus, geometric errors such as coaxiality, end face, radial circular runout, and gear meshing backlash can be measured during assembly, and repair and adjustment are carried out according to the requirements of the drawings. In order to evaluate the ability levels of fitters in aspects such as fitting and dial indicator measurement, it is necessary to design a radar antenna pedestal model that can test the fitting level of fitters, and this model needs to be light, easy to operate, and manually adjustable.

[0003] The existing small antenna pedestal still has a large weight and volume of structural parts, is complex in structure, high in cost, not convenient for quick assembly and adjustment, not convenient for measuring various fitting accuracies, and is not suitable for use as a device for testing the skills of assembly fitters. Summary of the Invention

[0004] Therefore, the present invention provides a light, economical, easy-to-operate and manually-adjustable radar antenna pedestal for testing the fitting ability of fitters. The assembly process needs to be similar to that of a pitch-azimuth radar antenna pedestal, including height adjustment, gear transmission, bearing assembly backlash elimination, dowel pin fitting and other assembly actions, and it is convenient to use a lever dial indicator to measure geometric errors such as coaxiality, end face, radial circular runout, gear meshing backlash, and flatness of each transmission part of the antenna pedestal.

[0005] A small antenna pedestal for testing the fitting ability of fitters according to the present invention includes four parts: an azimuth assembly platform, an azimuth gear transmission combination, a pitch antenna pedestal combination, and an array combination.

[0006] The azimuth assembly platform includes four support legs and a platform. The support legs are connected below the platform, and the extended height is adjustable to support the upper antenna pedestal. This part can test the height measurement and adjustment ability of fitters. When conducting height equalization inspection of the azimuth assembly platform, press the four corners of the platform to check whether there are any loose legs at the bottoms of the four support legs, and detect that the 4 measurement points marked on the platform are ≤0.03 mm in height relative to the measurement horizontal plane.

[0007] The azimuth gear transmission assembly includes a speed reducer, a speed reducer transition plate, a speed reducer handle, a pinion gear, a key, a pinion gear cap, and a gear bearing. The speed reducer is connected to the platform through the speed reducer transition plate. The position and direction of the output shaft of the speed reducer can be adjusted by its relative position with the speed reducer transition plate. A speed reducer handle is installed on the input shaft of the speed reducer, and manually rotating the speed reducer handle makes the output shaft rotate. The pinion gear is connected to the output shaft of the speed reducer through a key, and the pinion gear cap is connected to the upper end of the pinion gear to axially fix the pinion gear. The gear bearings are respectively connected to the platform and the turntable. When the output shaft of the speed reducer drives the pinion gear to rotate, the gear meshing makes the gear bearing drive the connected turntable to rotate within a range of 360°. This part can test the fitter's gear transmission meshing measurement, adjustment, and circular runout measurement capabilities. When inspecting the assembly of the speed reducer and the meshing gears of the azimuth gear transmission assembly, rotate the speed reducer handle, and it is required that the three measurement points marked on the pinion gear are ≤0.03 mm higher than the measurement horizontal plane, and the side clearance of the gear meshing needs to be between 0.08 - 0.15 mm.

[0008] The pitch antenna pedestal assembly includes a turntable, left and right bearing pedestals, pitch shaft heads, outer ring bearing caps, cylindrical roller bearings, angular contact ball bearings, bearing inner and outer retaining rings, left and right inner ring bearing caps, and lock nuts. A bearing pedestal is installed at each end of the turntable. Pitch shaft heads are installed on both sides of the array combination. A cylindrical roller bearing is installed on the left side and is installed in the left bearing pedestal as the movable end. A pair of angular contact ball bearings are installed on the right side of the array combination. The bearing inner and outer retaining rings are machined to eliminate the axial clearance of the bearings and are installed in the right bearing pedestal as the fixed end. The left and right sides are fixed with outer ring bearing caps, inner ring bearing caps, and lock nuts to achieve the pitch assembly of the array. The pitch rotation of the array can be manually toggled. This part can test the fitter's equal height measurement, adjustment, and bearing assembly clearance elimination capabilities. When inspecting the assembly of the pitch antenna pedestal assembly, rotate the turntable 360° and it is required that the circumferential radial runout and the upper surface end face runout of the turntable are ≤0.03 mm, the equal height of the pitch rotation center of the bearing pedestal relative to the horizontal plane is ≤0.03 mm, and the overall axial end play of the angular contact bearing is ≤0.03 mm.

[0009] The array combination includes a middle block array, a left block array, a right block array, array lugs, array lug pins, L-shaped fixing plates, array locking pins, and array connecting plates; the middle block array is connected to the left block array and the right block array through the array lugs (27) and the array connecting plates; the L-shaped fixing plates are installed at the bottom of the middle block array. After drilling pin holes on the L-shaped fixing plates, the L-shaped fixing plates and the left and right bearing seats are connected through the array locking pins to fix the array at the horizontal plane position. This part can test the fitter's coaxiality measurement, adjustment, and ability to drill positioning pins. When detecting the assembly of the array combination, the height difference of the upper surface of the middle block array measured perpendicular to the pitch axis should be ≤ 0.03 mm. Taking the bottom surfaces of the three arrays of the array combination as the common reference A and the side surfaces of the three arrays as the common reference B, when detecting the assembly, the height difference of the array lug pins relative to the reference A and the reference B should be ≤ 0.03 mm. After determining the position, the array is locked with the array connecting plates.

[0010] Furthermore, by connecting the L-shaped fixing plates and the left and right bearing seats through the array locking pins, the array can also be fixed at a position of 30° relative to the horizontal plane. The array combination also includes a 30° measuring plate. Using the 30° measuring plate as an aid, when detecting the assembly of the array combination, the height difference of the upper surface of the 30° measuring plate should be ≤ 0.03 mm.

[0011] The beneficial effects of the present invention are as follows

[0012] A pitch-azimuth radar pedestal model proposed by the present invention is lightweight, economical, easy to operate and manually adjust, with dimensions of 250 mm * 320 mm * 400 mm in length, width, and height and a total weight of 22 kg. Its four parts, namely the azimuth assembly platform, azimuth gear transmission combination, pitch pedestal combination, and array combination, can test the fitter's abilities in height adjustment, gear transmission meshing, bearing assembly backlash elimination, positioning pin drilling, etc. for assembly and dial indicator measurement; the pedestal assembly has high precision, and this structural form can also be used on small radar pedestals. Brief Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the pedestal model.

[0014] Figure 2 It is a schematic diagram of the azimuth assembly platform and the azimuth gear transmission combination.

[0015] Figure 3 It is a schematic diagram of the pitch pedestal combination and the array combination.

[0016] Figure 4 It is a cross-sectional view of the pedestal model.

[0017] Figure 5 It is a schematic diagram of the antenna array installation reference.

[0018] The meanings of the reference numerals are as follows: 1, azimuth assembly platform; 2, azimuth gear transmission combination; 3, elevation antenna pedestal combination; 4, array surface combination; 5, support leg; 6, platform; 7, reducer; 8, reducer transition plate; 9, reducer handle; 10, pinion gear; 11, key; 12, pinion gear cap; 13, gear bearing; 14, turntable; 15, bearing seat; 16, elevation shaft head; 17, outer ring bearing cover; 18, cylindrical roller bearing; 19, angular contact ball bearing; 20, bearing inner and outer retaining rings; 21, left inner ring bearing cover; 22, right inner ring bearing cover; 23, lock nut; 24, middle block array surface; 25, left block array surface; 26, right block array surface; 27, array surface support ear; 28, array surface support ear pin; 29, L-shaped fixing plate; 30, array surface locking pin; 31, array surface connecting plate; 32, 30° measuring plate. Detailed implementation manners

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Combined with Figures 1 - 5 , a small antenna pedestal for fitter assembly ability test of the present invention includes four parts: an azimuth assembly platform (1), an azimuth gear transmission combination (2), an elevation antenna pedestal combination (3), and an array surface combination (4).

[0021] The azimuth assembly platform (1) includes four support legs (5) and a platform (6). The support legs (5) support the upper antenna pedestal. The connection between the support legs (5) and the platform (6) is processed with fine-pitch threads to facilitate adjusting the elongation length of the support legs. After adjustment, use a fine-pitch nut matching the support legs to tighten the support legs; there is an opening on the platform (6) for installing the azimuth gear transmission combination (2), and 4 measuring points for measuring the horizontal are marked.

[0022] When conducting the equal-height assembly inspection of the azimuth assembly platform (1), press the four corners of the platform (6) to check whether there are any virtual legs at the bottoms of the four support legs, and detect that the 4 measuring points marked on the platform (6) need to be equal in height relative to the measuring horizontal plane ≤ 0.03 mm.

[0023] The azimuth gear drive assembly (2) includes a speed reducer (7), a speed reducer transition plate (8), a speed reducer handle (9), a pinion gear (10), a key (11), a pinion gear cap (12), and a gear bearing (13). The speed reducer (7) is connected to the opening of the platform (6) through the speed reducer transition plate (8). The speed reducer handle (9) is installed on the input shaft of the speed reducer (7), and the output shaft can be rotated manually by rotating the handle. The output shaft of the speed reducer (7) is connected to the pinion gear (10) through the key (11). The pinion gear cap (12) is connected to the upper end of the pinion gear (10) and fixed with bolts. The gear bearing (13) meshes with the pinion gear (10), the inner ring is connected to the surface of the platform (6), and the outer ring is connected to the turntable (14). When the output shaft of the speed reducer (7) drives the pinion gear (10) to rotate, the gear bearing (13) drives the fixed turntable (14) to rotate within a range of 360°. The side of the speed reducer transition plate (8) is fixed to the speed reducer 7 by three screws, and all three screws can be finely adjusted within the mounting through holes of the speed reducer (7), so as to realize the fine adjustment of the output shaft of the speed reducer (7) in the vertical direction. Waist-shaped holes are opened at both ends of the speed reducer transition plate (8) to adjust the center distance between the pinion gear (10) and the gear bearing (13), so as to realize the adjustment of the meshing backlash of the gears.

[0024] When inspecting the assembly of the speed reducer and the meshing gears of the azimuth gear drive assembly (2), rotate the speed reducer handle (9), and detect that the 3 measurement points marked on the pinion gear (10) need to be equal in height relative to the measurement horizontal plane ≤ 0.03 mm, and detect that the meshing backlash between the gears needs to be between 0.08 - 0.15 mm.

[0025] The pitch antenna pedestal assembly (3) includes a turntable (14), a bearing pedestal (15), a pitch shaft head (16), an outer ring bearing cover (17), a cylindrical roller bearing (18), an angular contact ball bearing (19), bearing inner and outer retaining rings (20), left and right inner ring bearing covers (21, 22), and a lock nut (23). When the turntable (14) is installed on the gear bearing (13), by finely adjusting the relative position of the fixing screws and the turntable (14), ensure that the rotation center of the turntable (14) is concentric with the center of the gear bearing (13), and pad copper sheets at the bottom of the turntable (14) to ensure that the upper surface of the turntable (14) is horizontal.

[0026] When inspecting the assembly of the turntable (14), rotate 360° and detect that the circumferential radial runout and the end face runout distance of the upper surface need to be ≤ 0.03 mm.

[0027] When installing the bearing seats (15) at both ends of the turntable (14), since the two bearing seats have different designed heights, copper sheets need to be padded at the bottom of the bearing seats to ensure that the pitching rotation center is ≤ 0.03 mm equal in height relative to the horizontal plane. When detecting, the equal height of the highest points of the bearing seats can be measured for substitution. While installing the bearing seats (15), the pitching shaft heads (16) are installed on both sides of the array combination (4); a cylindrical roller bearing (18) is installed on the left shaft head and fixed with a left inner ring bearing cover (21) and a lock nut (23), and then installed into the left bearing seat as the movable end; a pair of angular contact ball bearings (19) are installed face to face on the right shaft head. Before installation, according to the actual axial dimensions of the inner and outer rings of the angular contact ball bearing (19), the right inner ring bearing cover (22), and the outer ring bearing cover (17), and in combination with the thickness of the inner and outer retaining rings (20) of the bearing, the axial clearance of the bearing is eliminated to ensure that the overall axial end play ≤ 0.03 mm; the whole is installed into the right bearing seat as the fixed end, and then axially fixed with a lock nut (23) and an outer ring bearing cover (17).

[0028] The array combination (4) includes a middle block array (24), a left block array (25), a right block array (26), array support lugs (27), array support lug pins (28), L-shaped fixing plates (29), array locking pins (30), array connecting plates (31), and 30° measuring plates (32). When the middle block array (24) is butted with the left block array (25) and the right block array (26), it is first placed on a flat plate. The bottom surfaces of the three arrays serve as the common reference A, and the side surfaces of the three arrays serve as the common reference B. When assembling the two array support lugs (27), the position of the support lug holes is adjusted coaxially by padding copper sheets under the support lugs (27), and the array support lug pins (28) are installed in the support lug holes. When detecting, the equal height of the array support lug pins (28) relative to the reference A and the reference B needs to be ≤ 0.03 mm. After determining the position, the array is locked with an array connecting plate (31).

[0029] Two L-shaped fixing plates (29) are respectively installed on both sides of the bottom of the middle block array (24). First, pass the array locking pin (30) through the bearing seat (15). After adjusting the array to the 0° / 30° position relative to the horizontal plane, mark and punch pin holes on the two L-shaped fixing plates (29). After drilling, install the array locking pin (30), and the array can be fixed at two positions of 0° / 30° relative to the horizontal plane. When adjusting and detecting the array at 0°, the equal height of the upper surface of the middle block array needs to be ≤ 0.03 mm when measured perpendicular to the pitching axis; when adjusting and detecting the array at 30°, using the 30° measuring plate (32) as an aid, the equal height of the upper surface of the 30° measuring plate (32) needs to be ≤ 0.03 mm.

[0030] The present invention is not limited to the above specific embodiments, and the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made based on the technical essence of the present invention to the above embodiments shall be included in the protection scope of the present invention.

Claims

1. A small antenna pedestal for fitter assembly ability test, characterized in that: It includes four parts: an azimuth assembly platform, an azimuth gear drive combination, an elevation antenna pedestal combination, and an array combination; The azimuth assembly platform includes four support legs and a platform. The support legs are connected below the platform, and the extended height is adjustable to support the upper antenna pedestal; The azimuth gear drive combination includes a reducer, a reducer transition plate, a reducer handle, a pinion, a key, a pinion cap, and a gear bearing; The reducer is connected to the platform through the reducer transition plate. The position and direction of the output shaft of the reducer can be adjusted by its relative position with the reducer transition plate during assembly. The reducer handle is installed on the input shaft of the reducer, and manually rotating the reducer handle makes the output shaft rotate; The pinion is connected to the output shaft of the reducer through a key, and the pinion cap is connected to the upper end of the pinion to axially fix the pinion; The gear bearings are respectively connected to the platform and the turntable. When the output shaft of the reducer drives the pinion to rotate, the gears mesh to make the gear bearings drive the connected turntable to rotate within a range of 360°; The elevation antenna pedestal combination includes a turntable, left and right bearing pedestals, elevation shaft heads, outer ring bearing covers, cylindrical roller bearings, angular contact ball bearings, bearing inner and outer retaining rings, left and right inner ring bearing covers, and lock nuts; A bearing pedestal is installed at each end of the turntable. Elevation shaft heads are installed on both sides of the array combination. A cylindrical roller bearing is installed on the left side and is inserted into the left bearing pedestal as the movable end. A pair of angular contact ball bearings are installed on the right side of the array combination. The bearing inner and outer retaining rings are machined to eliminate the axial clearance of the bearings, and are inserted into the right bearing pedestal as the fixed end; The left and right sides are fixed with outer ring bearing covers, inner ring bearing covers, and lock nuts to achieve the elevation assembly of the array; The array combination includes a middle block array, a left block array, a right block array, array lugs, array lug pins, L-shaped fixing plates, array locking pins, and array connecting plates; The middle block array is connected to the left block array and the right block array through array lugs (27) and array connecting plates; The L-shaped fixing plate is installed at the bottom of the middle block array. After drilling and tapping pin holes on the L-shaped fixing plate, the L-shaped fixing plate and the left and right bearing pedestals are connected through array locking pins to fix the array at the horizontal position.

2. The small antenna pedestal for fitter assembly ability test according to claim 1, wherein: When conducting the equal-height assembly inspection of the azimuth assembly platform, press the four corners of the platform to check whether there are any loose legs at the bottoms of the four support legs, and detect that the 4 measurement points marked on the platform are ≤0.03mm higher than the measurement horizontal plane; 3. A small antenna pedestal for fitter assembly ability test according to claim 1, characterized in that: When conducting the inspection of the assembly of the reducer and the meshing gears of the azimuth gear drive combination, rotate the reducer handle, detect that the 3 measurement points marked on the pinion are ≤0.03mm higher than the measurement horizontal plane, and detect that the side clearance of the gear meshing is between 0.08 - 0.15mm; 4. The small antenna pedestal for fitter assembly ability test according to claim 1, wherein: When conducting the assembly inspection of the elevation antenna pedestal combination, rotate the turntable 360° to detect that the circumferential radial runout and the upper surface end face runout of the turntable are ≤0.03mm, the elevation rotation center of the bearing pedestal is ≤0.03mm higher than the horizontal plane, and the overall axial end play of the angular contact bearing is ≤0.03mm; 5. A small antenna pedestal for fitter assembly ability test according to claim 1, characterized in that: When conducting the assembly inspection of the array combination, measure the height of the upper surface of the middle block array perpendicular to the elevation axis and it should be ≤0.03mm; 6. A small antenna pedestal for fitter assembly ability test according to claim 1, characterized in that: Take the bottom surfaces of the three array surfaces in the array combination as the common reference A, and the side surfaces of the three array surfaces as the common reference B. During assembly inspection, the height difference between the array lug pins and the references A and B should be ≤ 0.03 mm. After determining the position, lock the array surface with the array connection plate.

7. A small antenna pedestal for fitter assembly ability test according to claim 1, characterized in that: Connect the L-shaped fixing plate and the left and right bearing seats through the array locking pins, and the array surface can also be fixed at a position of 30° relative to the horizontal plane.

8. A small antenna pedestal for fitter assembly ability test according to claim 7, characterized in that: The array combination also includes a 30° measuring plate. Using the 30° measuring plate as an aid, during the assembly inspection of the array combination, the height difference of the upper surface of the 30° measuring plate should be ≤ 0.03 mm.

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