CN106970363B - Triaxial antenna test turntable system with low reflection characteristic - Google Patents
Triaxial antenna test turntable system with low reflection characteristic Download PDFInfo
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- CN106970363B CN106970363B CN201710328578.3A CN201710328578A CN106970363B CN 106970363 B CN106970363 B CN 106970363B CN 201710328578 A CN201710328578 A CN 201710328578A CN 106970363 B CN106970363 B CN 106970363B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
- G01R29/105—Radiation diagrams of antennas using anechoic chambers; Chambers or open field sites used therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
A triaxial antenna test turntable system with low reflection characteristics comprises a rolling shaft system component, a pitching shaft system component and an azimuth shaft system component, wherein the azimuth shaft system component is arranged on a microwave darkroom foundation through an azimuth base, the pitching shaft system component is fixedly connected with an azimuth four-point contact ball turntable bearing outer ring through bolts, and the rolling shaft system component is fixedly connected with the upper end face of a pitching upper bracket through bolts; the load is arranged on the rolling load mounting plate, can realize three degrees of freedom rotary motion of rolling, pitching and azimuth, can be accurately positioned at a specified angular position, and has the characteristics of practicality, stability and reliability.
Description
Technical Field
The invention relates to a triaxial antenna testing turntable system with low reflection characteristics, in particular to a triaxial antenna turntable system with low reflection characteristics, which can be applied to radar performance testing in a microwave darkroom, in particular to testing of a microwave darkroom antenna or a radome.
Background
The triaxial antenna test turntable is used as important test equipment in the development process of the radar antenna, is used for simulating the space attitude motion of a tested product, has good rotation precision, ensures the practicability, stability and reliability of the whole test system, and plays a key role in the development process of the airborne radar.
The airborne radar and the radome are core components of an aircraft, when a conventional antenna is used for testing the turntable, the antenna supporting components are made of metal materials, and the pitching axis supporting mode is of a U-shaped structure, so that a large amount of wave absorbing materials are required to be attached to all exposed surfaces of the turntable before testing and used for absorbing electromagnetic waves; so as to reduce the interference caused by the reflected electromagnetic wave, but the method can not completely eliminate the reflected interference of the electromagnetic wave, and still can influence the accuracy of the performance test of the radar antenna.
Therefore, the materials and structural forms used for the radar antenna testing turret must be improved to meet this need.
Disclosure of Invention
The invention aims to provide a triaxial antenna test turntable system with low reflection characteristics, which can realize three degrees of freedom rotation motion of rolling, pitching and azimuth, can accurately position at a specified angular position and has the characteristics of practicality, stability and reliability.
The technical proposal adopted for realizing the aim is that the triaxial antenna test turntable system with low reflection characteristic comprises a rolling shaft system component, a pitching shaft system component and an azimuth shaft system component,
the rolling shafting assembly comprises a load, a rolling load mounting plate, a rolling four-point contact ball turntable bearing with external teeth, a rolling driving gear, a rolling planetary reducer, a rolling servo motor and a rolling frame, wherein the rolling four-point contact ball turntable bearing with external teeth is fixed at the left end of the rolling frame, and the rolling planetary reducer is fixed at the upper end of the rolling frame; an input shaft of the rolling planetary reducer is connected with an output shaft of the rolling servo motor, and a shell of the rolling servo motor is fixedly connected with a shell of the rolling planetary reducer by a screw; the output shaft of the rolling planetary reducer is provided with a rolling driving gear, the rolling load mounting plate is fixed on the outer ring end face of the rolling belt outer tooth four-point contact ball turntable bearing, and the load to be measured is fixed on the rolling load mounting plate;
the pitching shaft system assembly comprises a pitching right guide rail, a pitching left guide rail, a pitching upper bracket, a pitching lower bracket, a pitching sliding block bracket, a pitching servo motor, a pitching left end cover, a pitching driving gear, a pitching right angle speed reducer, a pitching four-point contact ball turntable bearing, a pitching right end cover, a pitching main shaft, a pitching right sliding block, a pitching left sliding block and a pitching frame, wherein the pitching right guide rail and the pitching left guide rail are arranged on the left side and the right side of the pitching frame, and a pitching right sliding block and a pitching left sliding block are respectively arranged on the working surfaces of the pitching right guide rail and the pitching left guide rail; the pitching sliding block support is fixed on the pitching right sliding block and the pitching left sliding block, a pitching lower support is arranged at the upper end of the pitching sliding block support, and a pitching upper support is arranged at the upper end face of the pitching lower support; the lower end of the pitching slider bracket is provided with a pitching right-angle speed reducer, a pitching four-point contact ball turntable bearing, a pitching left end cover and a pitching right end cover, the input end of the pitching right-angle speed reducer is connected with the output end of a pitching servo motor, the shell of the pitching right-angle speed reducer is connected with the shell of the pitching servo motor by screws, and the output end of the pitching right-angle speed reducer is connected with a pitching driving gear, a pitching main shaft and the inner ring of the pitching four-point contact ball turntable bearing;
the azimuth shafting assembly comprises an azimuth speed reducer bracket, an azimuth speed reducer adapter plate, an azimuth planetary speed reducer, an azimuth driving gear, an azimuth servo motor, an azimuth speed reducer dust cover, an azimuth four-point contact ball turntable bearing, an azimuth spindle gasket, an azimuth bearing seat end cover, an azimuth bearing outer ring gasket, an azimuth bearing inner ring gasket, an azimuth lower angular contact ball bearing, an azimuth upper angular contact ball bearing, an azimuth spindle, an azimuth base and an azimuth dust cover, wherein the azimuth four-point contact ball turntable bearing and the azimuth dust cover are mounted at the upper end of the azimuth base, the azimuth speed reducer bracket is mounted at the right end of the azimuth base, the azimuth speed reducer adapter plate, the azimuth planetary speed reducer and the azimuth servo motor are mounted in the azimuth speed reducer bracket, the azimuth driving gear is mounted at the output end of the azimuth planetary speed reducer, the azimuth bearing seat is mounted in the azimuth base, the azimuth lower angular contact ball bearing, the azimuth bearing outer ring gasket, the azimuth bearing seat end cover and the azimuth spindle are mounted in the azimuth bearing seat, and the azimuth spindle is matched at the upper end of the azimuth spindle;
the azimuth shafting component is arranged on the microwave darkroom foundation through the azimuth base, the pitching shafting component is fixedly connected with the outer ring of the azimuth four-point contact ball turntable bearing through bolts by the flange surface at the lower end of the pitching frame, and the rolling shafting component is fixedly connected with the upper end surface of the pitching upper bracket through bolts by the flange surface at the lower end of the rolling frame; the load is mounted on the roll load mounting plate, can realize three degrees of freedom rotational movement of roll, pitch and azimuth, and can be accurately positioned at a specified angular position.
Advantageous effects
Compared with the prior art, the invention has the following advantages.
1) The three-axis antenna turntable with the structure is used for radar antenna test, so that electromagnetic interference of the radar antenna in the test process can be reduced, and the accuracy of test data is improved;
2) The upper pitching bracket adopts glass fiber reinforced plastic (glass fiber reinforced plastic), so that the upper pitching bracket can save the cost of attaching wave-absorbing materials and save the production cost; and as electromagnetic reflection interference caused by the pitching frame is reduced, the testing efficiency of the radar antenna is improved, and the labor cost of later data processing is saved.
3) The three-axis antenna turntable system adopting the structural form adopts the feedback elements adopted by the three shafting to be an angle encoder of a servo motor, and the system is controlled to be semi-closed loop control; the shafting structure design can also be used for installing the angle encoder at the tail end of the shafting, realizing the full closed-loop control of the three shafting, and improving the position precision of the three shafting.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic view of a roll assembly according to the present invention;
FIG. 2 is a schematic view of a pitch assembly of the present invention;
FIG. 3 is a schematic diagram of a positioning module according to the present invention;
FIG. 4 is a three-dimensional schematic of the structure of the present invention;
FIG. 5 is a front view of the active test area of the present invention;
FIG. 6 is a left side view of the active test area of the present invention;
fig. 7 is a three-dimensional schematic diagram of a conventional antenna test turret.
Detailed Description
A triaxial antenna test turntable system with low reflection characteristics comprises a rolling axis system component, a pitching axis system component and an azimuth axis system component, as shown in figures 4, 5 and 6,
the rolling shafting assembly comprises a load 1, a rolling load mounting plate 2, a rolling four-point contact ball turntable bearing 3 with external teeth, a rolling driving gear 4, a rolling planetary reducer 5, a rolling servo motor 6 and a rolling frame 7, wherein the rolling four-point contact ball turntable bearing 3 with external teeth is fixed at the left end of the rolling frame 7, and the rolling planetary reducer 5 is fixed at the upper end of the rolling frame 7; an input shaft of the rolling planetary reducer 5 is connected with an output shaft of the rolling servo motor 6, and a shell of the rolling servo motor 6 is fixedly connected with a shell of the rolling planetary reducer 5 by a screw; the output shaft of the rolling planetary reducer 5 is fixed with a rolling driving gear 4, a rolling load mounting plate 2 is fixed on the outer ring end face of a rolling belt external tooth four-point contact ball turntable bearing 3, and a load 1 to be measured is fixed on the rolling load mounting plate 2, as shown in figure 1;
the pitching shafting assembly comprises a pitching right guide rail 8, a pitching left guide rail 9, a pitching upper bracket 10, a pitching lower bracket 11, a pitching sliding block bracket 12, a pitching servo motor 13, a pitching left end cover 14, a pitching driving gear 15, a pitching right angle speed reducer 16, a pitching four-point contact ball turntable bearing 17, a pitching right end cover 18, a pitching main shaft 19, a pitching right sliding block 20, a pitching left sliding block 21 and a pitching frame 22, wherein a pitching right guide rail 8 and a pitching left guide rail 9 are arranged on the left side and the right side of the pitching frame 22, and a pitching right sliding block 20 and a pitching left sliding block 21 are respectively arranged on the working surfaces of the pitching right guide rail 8 and the pitching left guide rail 9; the pitching slide block bracket 12 is fixed on the pitching right slide block 20 and the pitching left slide block 21, a pitching lower bracket 11 is arranged at the upper end of the pitching slide block bracket 12, and a pitching upper bracket 10 is arranged at the upper end surface of the pitching lower bracket 11; the lower end of the pitching slider bracket 12 is provided with a pitching right-angle speed reducer 16, a pitching four-point contact ball turntable bearing 17, a pitching left end cover 14 and a pitching right end cover 18, the input end of the pitching right-angle speed reducer 16 is connected with the output end of the pitching servo motor 13, the shell of the pitching right-angle speed reducer 16 is connected with the shell of the pitching servo motor 13 by screws, and the output end of the pitching right-angle speed reducer 16 is connected with the pitching driving gear 15, a pitching main shaft 19 and the inner ring of the pitching four-point contact ball turntable bearing 17, as shown in fig. 2;
the azimuth shafting assembly comprises an azimuth speed reducer bracket 23, an azimuth speed reducer adapter plate 24, an azimuth planetary speed reducer 25, an azimuth driving gear 26, an azimuth servo motor 27, an azimuth speed reducer dustproof cover 28, an azimuth four-point contact ball turntable bearing 29, an azimuth spindle gasket 30, an azimuth bearing seat 31, an azimuth bearing seat end cover 32, an azimuth bearing outer ring gasket 33, an azimuth bearing inner ring gasket 34, an azimuth lower angular contact ball bearing 35, an azimuth upper angular contact ball bearing 36, an azimuth spindle 37, an azimuth base 38 and an azimuth dustproof cover 39, wherein the azimuth four-point contact ball turntable bearing 29 and the azimuth dustproof cover 39 are mounted at the upper end of the azimuth base 38, the azimuth speed reducer bracket 23 is mounted at the right end of the azimuth base 38, the azimuth speed reducer 24, the azimuth planetary speed reducer 25 and the azimuth servo motor 27 are mounted in the azimuth speed reducer bracket 23, the azimuth driving gear 26 is mounted at the output end of the azimuth planetary speed reducer 25, the azimuth bearing seat 31 is mounted in the azimuth bearing seat 31, the azimuth lower angular contact ball bearing 35, the azimuth upper angular ball bearing 37, the azimuth bearing seat 33, the azimuth main ring gasket 32, the azimuth main shaft gasket 32, the azimuth end cover 37 and the azimuth servo motor end cover 37 are mounted in the azimuth bearing seat, and the azimuth servo motor is mounted in the azimuth bearing seat 31, as shown in the figure 3;
the azimuth shafting component is arranged on the microwave darkroom foundation through an azimuth base 38, the pitching shafting component is fixedly connected with the outer ring of the azimuth four-point contact ball turntable bearing 29 through bolts by the flange surface at the lower end of the pitching frame 22, and the rolling shafting component is fixedly connected with the upper end surface of the pitching upper bracket 10 through bolts by the flange surface at the lower end of the rolling frame 7; the load 1 is mounted on a roll load mounting plate 2 to enable rotational movement in three degrees of freedom, roll, pitch and azimuth, and to be accurately positioned at a prescribed angular position.
The upper pitching frame 10 is made of glass fiber reinforced plastic, and the lower pitching frame 11 is made of stainless steel.
The pitching right guide rail 8 and the pitching left guide rail 9 are arc spliced guide rails with the diameter of 6 meters and are provided with a pitching right sliding block 20 and a pitching left sliding block 21.
Examples
A triaxial antenna test turret system with low reflection characteristics, comprising: the load 1, the rolling load mounting plate 2, the rolling belt external tooth four-point contact ball turntable bearing 3, the rolling driving gear 4, the rolling planetary reducer 5, the rolling servo motor 6, the rolling frame 7, the pitching right guide rail 8, the pitching left guide rail 9, the pitching upper bracket 10, the pitching lower bracket 11, the pitching slide block bracket 12, the pitching servo motor 13, the pitching left end cover 14, the pitching driving gear 15, the pitching right angle reducer 16, the pitching four-point contact ball turntable bearing 17, the pitching right end cover 18, the pitching main shaft 19, the pitching right slide block 20, the pitching left slide block 21, the pitching frame 22, the azimuth reducer bracket 23, the azimuth reducer adapter plate 24, the azimuth planetary reducer 25, the azimuth driving gear 26, the azimuth servo motor 27, the azimuth reducer dust cover 28, the azimuth four-point contact ball turntable bearing 29, the azimuth main shaft gasket 30, the azimuth bearing seat 31, the azimuth bearing seat end cover 32, the azimuth bearing outer ring gasket 33, the azimuth bearing inner ring 34, the azimuth lower angular ball bearing 35, the azimuth upper contact ball bearing 36, the azimuth main shaft 37, the azimuth base 38 and the azimuth dust cover 39.
The rolling planetary reducer 5 is fixed at the upper end of the rolling frame 7; an input shaft of the rolling planetary reducer 5 is connected with an output shaft of the rolling servo motor 6, and a shell of the rolling servo motor 6 is fixedly connected with a shell of the rolling planetary reducer 5 by a screw; the rolling driving gear 4 is fixed on the output shaft of the rolling planetary reducer 5, the rolling load mounting plate 2 is fixed on the outer ring end face of the rolling belt external tooth four-point contact ball turntable bearing 3, the load 1 to be measured is fixed on the rolling load mounting plate 2, and the 7 parts form a rolling shafting assembly.
A pitching right guide rail 8 and a pitching left guide rail 9 are arranged on the left side and the right side of the pitching frame 22, and a pitching right sliding block 20 and a pitching left sliding block 21 are respectively arranged on the working surfaces of the pitching right guide rail 8 and the pitching left guide rail 9; the pitching slide block bracket 12 is fixed on the pitching right slide block 20 and the pitching left slide block 21, a pitching lower bracket 11 is arranged at the upper end of the pitching slide block bracket 12, and a pitching upper bracket 10 is arranged at the upper end surface of the pitching lower bracket 11; the lower end of the pitching slider bracket 12 is provided with a pitching right-angle speed reducer 16, a pitching four-point contact ball turntable bearing 17, a pitching left end cover 14 and a pitching right end cover 18. The input end of the pitching right-angle speed reducer 16 is connected with the output end of the pitching servo motor 13, the shell of the pitching right-angle speed reducer 16 is connected with the shell of the pitching servo motor 13 by bolts, the output end of the pitching right-angle speed reducer 16 is connected with the pitching driving gear 15, the pitching main shaft 19 and the inner ring of the pitching four-point contact ball turntable bearing 17, and the 15 parts form a pitching shafting assembly.
The upper end of the azimuth base 38 is provided with an azimuth four-point contact ball turntable bearing 29 and an azimuth dust cover 39, the right end of the azimuth base 38 is provided with an azimuth speed reducer bracket 23, an azimuth speed reducer adapter plate 24, an azimuth planetary speed reducer 25 and an azimuth servo motor 27 are arranged in the azimuth speed reducer bracket 23, and an azimuth driving gear 26 is arranged at the output end of the azimuth planetary speed reducer 25. The azimuth pedestal 38 is internally provided with an azimuth bearing seat 31, the azimuth bearing seat 31 is internally provided with an azimuth lower angular contact ball bearing 35, an azimuth upper angular contact ball bearing 36, an azimuth bearing outer ring gasket 33, an azimuth bearing inner ring gasket 34, an azimuth bearing seat end cover 32 and an azimuth spindle 37, and the upper end of the azimuth spindle 37 is matched with the azimuth spindle gasket 30.
The angle encoders are arranged in the servo motors of the three assemblies, so that angle position feedback information can be provided for the three shafting, and semi-closed loop control of shafting movement is realized.
The inner ring of the rolling belt external tooth four-point contact ball turntable bearing 3 is fixed on the end surface of the rolling frame 7 by bolts, and the flange surface of the shell of the rolling planetary reducer 5 is fixed with the upper part of the rolling frame 7 by bolts. The tail part of the shell of the rolling planetary reducer 5 is connected with the shell of the rolling servo motor 6 by a screw, and the input shaft of the rolling planetary reducer 5 is connected with the output shaft of the rolling servo motor 6 by a coupling; the rolling driving gear 4 is connected with an output shaft of the rolling planetary reducer 5 through screws, the rolling load mounting plate 2 is fixedly connected with the end face of the outer ring of the rolling belt external tooth four-point contact ball turntable bearing 3 through screws, and the load 1 is connected with the rolling load mounting plate 2 through screws.
The rotation sequence of each part in the rolling shafting assembly is that the rolling servo motor 6 converts electric energy into kinetic energy, the kinetic energy is transmitted to the rolling driving gear 4 through the rolling planetary reducer 5, the rolling driving gear 4 is meshed with an outer gear ring of the rolling belt outer tooth four-point contact ball turntable bearing 3 and rotates in a decelerating way, and finally, the kinetic energy is transmitted to the rolling load mounting plate 2 to drive the load 1 to rotate.
The pitching right guide rail 8 and the pitching left guide rail 9 are fixed on a reference surface of the pitching frame 22 by screws, the pitching slide block bracket 12 is fixed on the pitching right slide block 20 and the pitching left slide block 21 by screws, the pitching lower bracket 11 is fixed on the upper end of the pitching slide block bracket 12 by screws, and the pitching upper bracket 10 and the pitching lower bracket 11 are fastened together by screws through two flange surfaces. The flange on the outer shell of the pitching right-angle speed reducer 16 is matched with the pitching sliding block bracket 12 and is fixed by screws, the outer shell of the pitching servo motor 13 is connected with the tail of the outer shell of the pitching right-angle speed reducer 16 by screws, the input shaft of the pitching right-angle speed reducer 16 is connected with the output shaft of the pitching servo motor 13 by a coupling, and the output end of the pitching right-angle speed reducer 16 is fixed with a pitching driving gear 15 by screws; the left end of the pitching main shaft 19 is connected with the pitching driving gear 15 by a screw, the right end of the pitching main shaft 19 is connected with the inner ring of the pitching four-point contact ball turntable bearing 17 by a screw, and the outer ring of the pitching four-point contact ball turntable bearing 17 is matched with the pitching slider bracket 12 and fixed by a screw.
The rotation sequence of each part in the pitching shaft system assembly is that the pitching servo motor 13 converts electric energy into kinetic energy, the kinetic energy is transmitted to the pitching driving gear 15 through the pitching right-angle speed reducer 16, the pitching driving gear 15 is meshed with an inner gear ring of the pitching frame 22 and rotates in a decelerating way, finally, the kinetic energy is transmitted to the pitching slider bracket 12, and the pitching servo motor slides up and down along the pitching right guide rail 8 and the pitching left guide rail 9 in a restraining way of the pitching right slider 20 and the pitching left slider 21, so that the pitching lower bracket 11, the pitching upper bracket 10 and the rolling shaft system assembly are driven to do pitching motion together.
The upper pitching frame 10 is made of glass fiber reinforced plastic, and the lower pitching frame 11 is made of stainless steel.
The azimuth base 38 is a main support, the upper end face is matched with the end face of the inner ring of the azimuth four-point contact ball turntable bearing 29, the upper end face and the inner ring are fixed by screws, and the azimuth dust cover 39 is sleeved on the outer surface of the azimuth base 38 and fixed by screws; the right end face of the azimuth base 38 is matched with the end face of the azimuth speed reducer bracket 23 and fastened by screws, and the azimuth speed reducer adapter plate 24 is matched with the installation face of the azimuth speed reducer bracket 23 by flange faces and fastened by screws; an azimuth planetary reducer 25 is fixed on the lower end surface of the azimuth reducer adapter plate 24 serving as a support by using screws; the shell of the azimuth servo motor 27 is fixed at the tail part of the shell of the azimuth planetary reducer 25 by using screws, and an output shaft of the azimuth servo motor 27 is connected with an input shaft of the azimuth planetary reducer 25 by using a coupler; the azimuth driving gear 26 is fixed at the output end of the azimuth planetary reducer 25 by a screw and meshed with an outer gear ring of an azimuth four-point contact ball turntable bearing 29; the inner hole of the azimuth base 38 is matched with the outer radial direction and the end face of the azimuth bearing seat 31, and the inner hole and the end face are axially fixed by screws; the azimuth lower angular contact ball bearing 35 and the azimuth upper angular contact ball bearing 36 are installed in a face-to-face manner, an azimuth bearing outer ring gasket 33 and an azimuth bearing inner ring gasket 34 are respectively matched between bearing pairs, the upper end face of the azimuth bearing seat end cover 32 presses the outer ring of the azimuth lower angular contact ball bearing 35, and the azimuth bearing seat end cover 32 is fixed on the azimuth bearing seat 31 through screws; the outer circle of the azimuth spindle 37 is radially matched with the inner ring of the bearing pair, and an azimuth spindle gasket 30 is matched with the flange surface on the azimuth spindle 37; the upper end face of the outer ring of the azimuth four-point contact ball turntable bearing 29 and the upper end face of the azimuth spindle washer 30 are respectively matched with the lower end face of the pitching frame 22, the outer ring of the four-point contact ball turntable bearing 29 is fixed with the pitching frame 22 by screws, and the azimuth spindle 37 is fixed with the pitching frame 22 by screws through the azimuth spindle washer 30.
The rotation sequence of each part in the azimuth shafting assembly is that an azimuth servo motor 27 converts electric energy into kinetic energy, the kinetic energy is transmitted to an azimuth driving gear 26 through an azimuth planetary reducer 25, the azimuth driving gear 26 is meshed with an outer gear ring of an azimuth four-point contact ball turntable bearing 29 and rotates in a decelerating way, and finally, the kinetic energy is transmitted to a pitching shafting assembly to drive the pitching shafting assembly and a rolling shafting assembly to do azimuth movement together.
The rolling frame 7 is used as a support, the rolling planetary reducer 5 is fixed at an upper end hole of the rolling frame 7, the rolling driving gear 4 is fixed at an output end of the rolling planetary reducer 5, and a rolling reduction mechanism shafting is formed by means of internal bearing combination of the rolling planetary reducer 5, and the rolling driving gear 4 of the shafting is asymmetrically arranged.
The pitching sliding block support 12 is a frame, a shell flange of the pitching right-angle speed reducer 16 is fixed at the left end of the pitching sliding block support 12, an outer ring of the pitching four-point contact ball turntable bearing 17 is fixed at the right end of the pitching sliding block support 12, the middle of the pitching sliding block support is connected in series through a pitching driving gear 15 and a pitching main shaft 19 to jointly form a pitching speed reducing mechanism shafting, and the pitching driving gears 15 of the shafting are symmetrically arranged.
The azimuth speed reducer bracket 23 is a frame, the azimuth speed reducer adapter plate 24 is fixed in a matching hole of the azimuth speed reducer bracket 23, the azimuth planetary speed reducer 25 is fixed in the matching hole of the azimuth speed reducer bracket 23, the azimuth driving gear 26 is fixed at the output end of the azimuth planetary speed reducer 25, an azimuth speed reducer mechanism shafting is formed by means of bearing combination in the azimuth planetary speed reducer 25, and the azimuth driving gear 26 of the shafting is asymmetrically arranged.
The shaft system assembly consisting of the azimuth bearing seat 31, the azimuth lower angular contact ball bearing 35, the azimuth upper angular contact ball bearing 36, the azimuth bearing outer ring gasket 33, the azimuth bearing inner ring gasket 34, the azimuth bearing seat end cover 32, the azimuth main shaft 37 and the azimuth main shaft gasket 30 is arranged in the inner hole of the azimuth base 38, the upper end of the shaft system is fixed with the pitching frame 22 by using screws, and the shaft system is used as an auxiliary support of the azimuth shaft system, so that the radial and axial runout of the shaft system can be reduced, and the mechanical precision of the azimuth shaft system is improved.
Azimuth spindle spacer 30 is mounted between pitch frame 22 and azimuth spindle 37, and the thickness of the regrinding spacer can be adjusted to the verticality of the three axes.
The pitching right guide rail 8 and the pitching left guide rail 9 are arc spliced guide rails with the diameter of 6 meters and are provided with a pitching right sliding block 20 and a pitching left sliding block 21; the number of the sliding blocks can be increased or decreased according to the bearing capacity.
Three axes of three shafting virtual theoretically intersect at a point.
When the load 1 end is seen to the rolling shaft system assembly, only the load 1 can be seen, and the rest non-shielded part materials are glass fiber reinforced plastics.
When the whole triaxial antenna turntable is placed in a microwave darkroom for testing, the part below the pitching upper bracket 10 is made of a metal material, and a wave absorbing material must be attached to the surface so as to improve the accuracy of the testing.
The ring gear on the pitch frame 22 is an annular gear, which is integral with the pitch frame 22.
In order to truly simulate the actual application state, a frame of a pitching shaft system in a triaxial antenna test turntable is changed into an open type, an axis is rotated by 90 degrees around an azimuth axis, a rolling shaft system component is placed on a pitching support, three-axis intersection points are overlapped in theory, the pitching support is changed into a nonmetallic glass fiber reinforced plastic material, the pitching support and the parts above are not attached with wave absorbing materials in the actual test process, and the wave absorbing materials are attached to parts below the pitching support only; in an effective test area outside the periphery of the rolling shaft system, electromagnetic wave reflection interference caused by a pitching shaft system assembly can be almost eliminated; therefore, the electromagnetic wave reflection characteristic of the whole triaxial antenna turntable is lower than that of the conventional triaxial antenna turntable; the structural scheme can improve the accuracy of radar antenna testing and the overall testing efficiency.
As shown in fig. 1, the rolling frame 7 is used as a main support, the inner ring of the ball turntable bearing which is in contact with the four points of the external teeth of the rolling belt at the left end of the rolling frame is fixed by bolts, and the flange surface of the rolling planetary reducer shell is positioned with the mounting surface at the upper part of the rolling frame and fixed by bolts. The shell flange of the rolling servo motor is connected with the shell tail of the rolling planetary reducer through screws, and the output shaft of the rolling servo motor is connected with the input shaft of the rolling planetary reducer through a coupler; the rolling driving gear is positioned with the rolling planetary reducer by a spigot and is connected by a screw; the rolling load mounting plate is fixed with the end face of the outer ring of the rolling belt external tooth four-point contact ball turntable bearing by using screws, the load is connected with the rolling load mounting plate by using screws, the rolling servo motor drives the rolling planetary reducer, power is sequentially transmitted to the rolling driving gear, the outer ring of the rolling belt external tooth four-point contact ball turntable bearing and the rolling load mounting plate, and finally load rotation is realized.
As shown in fig. 2, a pitching frame is used as a main support, a pitching right guide rail and a pitching left guide rail are respectively arranged on reference surfaces at two ends by screws, and a pitching right slider and a pitching left slider are arranged on the pitching right guide rail and the pitching left guide rail; the pitching sliding block support is fixed on the pitching right sliding block and the pitching left sliding block through screws, the pitching lower support is fixed on the upper end face of the pitching sliding block support through screws, and the pitching upper support and the pitching lower support are fastened together through two flange mounting surfaces through screws.
The outer ring of the pitching four-point contact ball turntable bearing is matched with the right end of the pitching sliding block bracket and fixed by a screw; the pitching right-angle speed reducer and the left end of the pitching sliding block bracket are positioned by a spigot, and a screw is fixed on the flange surface of the shell of the pitching right-angle speed reducer; the pitching servo motor and the pitching right-angle speed reducer are positioned by a spigot on the shell, the pitching servo motor and the pitching right-angle speed reducer are fixed by a screw, and an input shaft of the pitching right-angle speed reducer is connected with an output shaft of the pitching servo motor by a coupler; the left end of the pitching driving gear is positioned with the flange surface of the output end of the pitching right-angle speed reducer by a spigot, the right end of the pitching driving gear is matched with the left end of a pitching main shaft, the right end of the pitching main shaft is matched with the inner ring of a pitching four-point contact ball turntable bearing, and three parts are mutually fixed by screws in sequence; the pitching servo motor drives the pitching right-angle speed reducer, and transmits power to the pitching driving gear, the pitching frame internal teeth, the pitching sliding block support, the pitching lower support and the pitching upper support in sequence, and finally transmits the power to the rolling shaft system assembly.
As shown in fig. 3, the azimuth base is used as a main support, the upper end surface is positioned with the inner ring spigot of the azimuth four-point contact ball turntable bearing, the upper end surface and the inner ring spigot are fixed by screws, and the azimuth dust cover is sleeved on the outer side of the azimuth base and fixed by screws; the right end face of the azimuth base is matched with the mounting face of the azimuth speed reducer bracket and is fastened by screws, the azimuth speed reducer bracket is fixed on the right side of the azimuth base by screws, and an azimuth speed reducer adapter plate, an azimuth planetary speed reducer and an azimuth servo motor are sequentially mounted in the azimuth speed reducer bracket in a spigot positioning and screw fixing mode; an output shaft of the azimuth servo motor is connected with an input shaft of the azimuth planetary reducer through a coupler; the azimuth driving gear is fixed at the output end of the azimuth planetary reducer by a screw and meshed with an outer gear ring of the azimuth four-point contact ball turntable bearing;
the inner hole of the azimuth base is fixed with an azimuth bearing seat by a screw, an azimuth upper angular contact ball bearing, an azimuth bearing outer ring gasket, an azimuth bearing inner ring gasket and an azimuth lower angular contact ball bearing are sequentially arranged in the azimuth bearing seat, an azimuth bearing seat end cover is fixed on the azimuth bearing seat by the screw, and the outer ring of the azimuth lower angular contact ball bearing is pressed tightly, so that the 'face-to-face' matching of the angular contact ball bearings is realized;
the outer circle of the azimuth spindle is radially matched with the inner ring of the bearing pair, and an azimuth spindle gasket is matched with the flange surface on the azimuth spindle; the upper end face of the outer ring of the four-point contact ball turntable bearing and the upper end face of the azimuth spindle gasket are respectively matched with the lower end face of the pitching frame, the outer ring of the four-point contact ball turntable bearing is fixed with the pitching frame by using screws, and the azimuth spindle is fixed with the pitching frame by using screws through the azimuth spindle gasket.
The azimuth servo motor drives the azimuth planetary reducer, power is sequentially transmitted to the azimuth driving gear, the outer ring of the azimuth belt outer tooth four-point contact ball turntable bearing and the pitching frame, and finally azimuth rotation of the pitching shaft system assembly is realized.
The use form of the triaxial antenna test turntable with the low reflection characteristic is not limited to the use of an encoder with a motor, and an angle sensor can be arranged at the tail end of a shaft system in order to improve the positioning accuracy of the shaft system.
Claims (1)
1. A triaxial antenna test turntable system with low reflection characteristics comprises a rolling axis system component, a pitching axis system component and an azimuth axis system component, and is characterized in that,
the rolling shafting assembly comprises a load (1), a rolling load mounting plate (2), a rolling ball turntable bearing (3) with external teeth and four points, a rolling driving gear (4), a rolling planetary reducer (5), a rolling servo motor (6) and a rolling frame (7), wherein the rolling ball turntable bearing (3) with external teeth and four points is fixed at the left end of the rolling frame (7), and the rolling planetary reducer (5) is fixed at the upper end of the rolling frame (7); an input shaft of the rolling planetary reducer (5) is connected with an output shaft of the rolling servo motor (6), and a shell of the rolling servo motor (6) is fixedly connected with a shell of the rolling planetary reducer (5) through screws; the rolling planetary reducer (5) comprises an output shaft, a rolling driving gear (4), a rolling load mounting plate (2), a measured load (1) and a rolling load mounting plate (2), wherein the rolling load mounting plate is fixed on the end face of the outer ring of the rolling belt external tooth four-point contact ball turntable bearing (3);
the pitching shaft system assembly comprises a pitching right guide rail (8), a pitching left guide rail (9), a pitching upper bracket (10), a pitching lower bracket (11), a pitching sliding block bracket (12), a pitching servo motor (13), a pitching left end cover (14), a pitching driving gear (15), a pitching right angle speed reducer (16), a pitching four-point contact ball turntable bearing (17), a pitching right end cover (18), a pitching main shaft (19), a pitching right sliding block (20), a pitching left sliding block (21) and a pitching frame (22), wherein the pitching right guide rail (8) and the pitching left guide rail (9) are arranged on the left side and the right side of the pitching frame (22), and a pitching right sliding block (20) and a pitching left sliding block (21) are respectively arranged on the working surfaces of the pitching right guide rail (8) and the pitching left guide rail (9); the pitching sliding block support (12) is fixed on the pitching right sliding block (20) and the pitching left sliding block (21), a pitching lower support (11) is arranged at the upper end of the pitching sliding block support (12), and a pitching upper support (10) is arranged at the upper end face of the pitching lower support (11); the lower end of the pitching slider bracket (12) is provided with a pitching right-angle speed reducer (16), a pitching four-point contact ball turntable bearing (17), a pitching left end cover (14) and a pitching right end cover (18), the input end of the pitching right-angle speed reducer (16) is connected with the output end of a pitching servo motor (13), the shell of the pitching right-angle speed reducer (16) is connected with the shell of the pitching servo motor (13) by bolts, and the output end of the pitching right-angle speed reducer (16) is connected with a pitching driving gear (15), a pitching main shaft (19) and the inner ring of the pitching four-point contact ball turntable bearing (17);
the azimuth shafting assembly comprises an azimuth speed reducer bracket (23), an azimuth speed reducer adapter plate (24), an azimuth planetary speed reducer (25), an azimuth driving gear (26), an azimuth servo motor (27), an azimuth speed reducer dust cover (28), an azimuth four-point contact ball rotary disc bearing (29), an azimuth spindle gasket (30), an azimuth bearing seat (31), an azimuth bearing seat end cover (32), an azimuth bearing outer ring gasket (33), an azimuth bearing inner ring gasket (34), an azimuth lower angular contact ball bearing (35), an azimuth upper angular contact ball bearing (36), an azimuth spindle (37), an azimuth base (38) and an azimuth dust cover (39), wherein the azimuth four-point contact ball rotary disc bearing (29) and the azimuth dust cover (39) are arranged at the upper end of the azimuth base (38), the azimuth speed reducer bracket (23) is arranged at the right end of the azimuth base (38), the azimuth speed reducer bracket (24), the azimuth speed reducer (25) and the azimuth servo motor (27) are arranged in the azimuth speed reducer bracket (23), the azimuth driving gear (26) is arranged at the output end of the azimuth planetary speed reducer (25), the azimuth base (38) is arranged in the azimuth speed reducer, the azimuth base (38) is internally provided with the azimuth four-point contact ball bearing (31), and the azimuth bearing (35) is arranged in the azimuth speed reducer bearing seat (31), an azimuth bearing outer ring gasket (33), an azimuth bearing inner ring gasket (34), an azimuth bearing seat end cover (32) and an azimuth spindle (37), wherein the upper end of the azimuth spindle (37) is matched with an azimuth spindle gasket (30);
the azimuth shafting assembly is arranged on a microwave darkroom foundation through an azimuth base (38), the pitching shafting assembly is fixedly connected with the outer ring of the azimuth four-point contact ball turntable bearing (29) through bolts by the flange surface at the lower end of the pitching frame (22), and the rolling shafting assembly is fixedly connected with the upper end surface of the pitching upper bracket (10) through bolts by the flange surface at the lower end of the rolling frame (7); the load (1) is arranged on the rolling load mounting plate (2), can realize three degrees of freedom rotation motion of rolling, pitching and azimuth, and can be accurately positioned at a specified angular position;
the upper pitching bracket (10) is made of glass fiber reinforced plastic, and the lower pitching bracket (11) is made of stainless steel;
the pitching right guide rail (8) and the pitching left guide rail (9) are arc spliced guide rails with the diameter of 6 meters and are provided with a pitching right sliding block (20) and a pitching left sliding block (21).
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