Pitching turntable for large-scale phased array system radar test and design method thereof

Abstract

The invention relates to a pitching rotary table for large phased array system radar testing and a design method thereof.The pitching rotary table comprises a bottom plate, a double-shaft speed reducer is installed on the bottom plate, vertical column plates are fixed to the two opposite sides of the bottom plate respectively, a pitching rotary table assembly is rotationally connected between the two vertical plates, and the pitching rotary table assembly is connected with the double-shaft speed reducer. The double-shaft speed reducer drives the pitching rotary table assembly to rotate at the pitching angle of 0-90 degrees through the gear assembly. The problems that in the microwave test, a tested piece is large and heavy and is inconvenient to install are solved, the problems that the installation space is small and the load is large and heavy are solved, and the problems of safety and reliability in the large-load pitching process are solved.

Description

Technical Field

[0001] The present invention relates to the field of radar testing technology, and in particular to a pitch turntable for large-scale phased array radar testing and a design method thereof, which is used in an antenna testing system and is used in large-scale phased array testing or large-scale radar testing. It is mainly used for the pitch motion of large-load equipment in microwave testing, with a maximum load of 1000kg, a maximum speed of 3° / s, and an angle of 0° to 90°. Background Art

[0002] Phased array radar is a phase-controlled electronically scanned array radar that uses a large number of individually controlled small antenna units arranged into an antenna array. Each antenna unit is controlled by an independent phase shift switch. By controlling the phase of the transmission of each antenna unit, different phase beams can be synthesized.

[0003] In the existing technology, the phased array radar is composed of hundreds or tens of thousands of array elements, with a large volume and heavy mass. During the operation of the phased array radar, the wave velocity scanning angle is large, and a pitch turntable is required. The phased array radar test and replacement requires the phased array radar to be placed in a lower position, which requires a pitch turntable. The current pitch turntable is large in size, not compact in structure, and has uneven force, resulting in a large area for radar installation, time-consuming and labor-intensive, and cannot be installed quickly.

[0004] The above-mentioned existing technical solutions have the following defects: In the current microwave test, the tested parts are large and heavy, which are often difficult to install. There are great safety hazards when installing with escalators. The structure is not compact, the volume is large, and the installation space is large. The structural transmission design problem leads to instability without force. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a pitch turntable and a design method for testing a large phased array radar. The pitch turntable can achieve a large pitch angle of 0° to 90°, and the mounting surface can be pitched to a height that is convenient for installation and debugging.

[0006] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0007] A pitch turntable for testing a large phased array radar comprises a base plate, a dual-axis reducer is mounted on the base plate, upright plates are fixed to opposite sides of the base plate, a pitch turntable assembly is rotatably connected between the two upright plates, and the dual-axis reducer drives the pitch turntable assembly to rotate at a pitch angle of 0° to 90° via a gear assembly.

[0008] As a further technical solution of the present invention: the pitch turntable assembly includes a top plate, a rotating shaft and a secondary reduction gear respectively fixed at both ends of the rotating shaft, the two secondary reduction gears are respectively arranged on the side of the two column plates close to each other, the rotating shaft is rotatably arranged on the two column plates, the top plate is fixed on the two secondary reduction gears, and the gear assembly is transmission connected to the two secondary reduction gears.

[0009] As a further technical solution of the present invention: the gear assembly includes two couplings, two primary reduction pinions, two primary reduction gears and two transmission gears;

[0010] The two couplings are respectively mounted on the output shafts at both ends of the double-shaft reducer, and the output shafts at both ends of the double-shaft reducer respectively pass through the column plates and are fixedly connected to the two primary reduction pinions, and the primary reduction pinions are meshed with the primary reduction gear;

[0011] A rotating shaft is fixed between the two primary reduction gears, the rotating shaft is rotatably arranged between the two column plates, and the two transmission gears are fixed on the rotating shaft and mesh with the secondary reduction gear.

[0012] As a further technical solution of the present invention: a plurality of tripods are detachably fixedly connected to the bottom plate, and one side of the tripod is detachably fixed to the side wall of the column plate.

[0013] As a further technical solution of the present invention: a horizontal limiting wheel set and a vertical limiting wheel set are fixed to the outer side wall of the secondary reduction gear, a slope is arranged on the top surface of the column plate, and a limiting groove is arranged on the side surface of the column plate;

[0014] When the top plate rotates to a horizontal position, the horizontal limiting wheel set abuts against the inclined surface, and when the top plate rotates to a vertical position, the vertical limiting wheel set abuts against the limiting groove.

[0015] As a further technical solution of the present invention: the dual-axis reducer is a worm gear reducer.

[0016] According to the above-mentioned design method of an elevation turntable for testing a large phased array radar, the elevation turntable adopts a Panasonic MHMF2000W servo motor as power output, which is transmitted to the load through a reversing worm gear reducer (AT280, speed ratio 120) and a two-stage gear transmission (first stage 9:30:140) to perform a 0°-90° pitch.

[0017] In summary, the present invention includes at least one of the following beneficial technical effects:

[0018] 1. The present invention discloses a pitch turntable for testing a large phased array radar and a design method thereof. When the pitch turntable is working, the load is installed on the top plate, and the dual-axis reducer drives the primary reduction pinions at both ends to rotate, and the primary reduction pinions drive the primary reduction large gears to rotate, thereby driving the rotating shaft to rotate between the two column plates, the rotating shaft drives the transmission gear to rotate, and the transmission gear drives the secondary reduction large gear to rotate, thereby causing the rotating shaft to rotate between the two column plates, so that the top plate above can perform a large angle of pitch rotation. The present invention solves the problem of inconvenient installation of large and heavy test pieces in microwave testing, solves the problem of small installation space and heavy loads, and solves the problem of safety and reliability during large load pitching. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the pitch turntable of the present invention.

[0020] Figure 2 It is a three-dimensional diagram of the pitch turntable of the present invention.

[0021] Figure 3 It is a side view of the pitch turntable of the present invention.

[0022] Figure 4 It is a transmission schematic diagram of the pitch turntable of the present invention.

[0023] Figure 5 It is a force diagram of the pitch turntable of the present invention.

[0024] Figure 6 It is a finite element analysis diagram of the secondary transmission input shaft of the present invention.

[0025] Figure 7 It is a finite element analysis diagram of the pitch mounting plate of the present invention.

[0026] Figure 8 This is a flange diagram for mounting the pitch turntable of the present invention.

[0027] Figure numerals: 1. Base plate; 11. Lifting ring; 2. Dual-axis reducer; 3. Column plate; 31. Inclined surface; 32. Limiting groove; 4. Pitch turntable assembly; 41. Top plate; 42. Rotating shaft; 43. Secondary reduction gearwheel; 44. Horizontal limiting wheel set; 45. Vertical limiting wheel set; 5. Gear assembly; 51. Coupling; 52. Primary reduction pinion; 53. Primary reduction gearwheel; 54. Transmission gear; 55. Rotating shaft; 6. Tripod. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0029] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] Embodiment 1:

[0032] Reference Figure 1 , which is a pitch turntable for testing large phased array radar disclosed in the present invention, includes a base plate 1, a dual-axis reducer 2 is installed on the base plate 1, column plates 3 are respectively fixed on the opposite sides of the base plate 1, a pitch turntable assembly 4 is rotatably connected between the two vertical plates, and the dual-axis reducer 2 drives the pitch turntable assembly 4 to rotate at a pitch angle of 0° to 90° through a gear assembly 5, and the maximum speed is 3° / s.

[0033] Among them, the four corners of the top surface of the bottom plate 1 are respectively fixed with lifting rings 11. The setting of the lifting rings 11 facilitates the movement of the position of the pitch turntable, thereby improving the convenience during use.

[0034] Reference Figure 1 The pitch turntable assembly 4 includes a top plate 41, a rotating shaft 42, and a two-stage reduction gearwheel 43 respectively fixed at both ends of the rotating shaft 42. The two two-stage reduction gearwheels 43 are respectively arranged on the side of the two column plates 3 close to each other. The rotating shaft 42 is rotatably arranged on the two column plates 3, the top plate 41 is fixed on the two two-stage reduction gearwheels 43, and the gear assembly 5 is transmission-connected with the two two-stage reduction gearwheels 43.

[0035] Reference Figure 1 and Figure 2 The gear assembly 5 includes two couplings 51, two primary reduction pinions 52, two primary reduction gears 53 and two transmission gears 54; the two couplings 51 are respectively installed on the output shafts at both ends of the double-axis reducer 2, and the output shafts at both ends of the double-axis reducer 2 pass through the column plates 3 and are fixedly connected with the two primary reduction pinions 52, and the primary reduction pinions 52 and the primary reduction gears 53 are meshed with each other; a rotating shaft 55 is fixed between the two primary reduction gears 53, and the rotating shaft 55 is rotatably set between the two column plates 3, and the two transmission gears 54 are fixed on the rotating shaft 55 and are meshed with the secondary reduction gear 43.

[0036] Reference Figure 1 , a plurality of tripods 6 are detachably fixedly connected to the bottom plate 1, and one side of the tripod 6 is detachably fixed to the side wall of the column plate 3. A horizontal limit wheel set 44 and a vertical limit wheel set 45 are fixed to the outer side wall of the secondary reduction gear 43, an inclined surface 31 is provided on the top surface of the column plate 3, and a limit groove 32 is provided on the side surface of the column plate 3;

[0037] When the top plate 41 rotates to a horizontal position, the horizontal limiting wheel set 44 abuts against the inclined surface 31, and when the top plate 41 rotates to a vertical position, the vertical limiting wheel set 45 abuts against the limiting groove 32. In this embodiment, the dual-axis reducer 2 is a worm gear reducer.

[0038] When the pitch turntable is working, the load is installed on the top plate 41, and the dual-axis reducer 2 drives the primary reduction pinion 52 at both ends to rotate, and the primary reduction pinion 52 drives the primary reduction gear 53 to rotate, thereby driving the rotating shaft 55 to rotate between the two column plates 3, and the rotating shaft 55 drives the transmission gear 54 to rotate, and the transmission gear 54 drives the secondary reduction gear 43 to rotate, so that the rotating shaft 42 rotates between the two column plates 3, so that the upper top plate 41 can perform a large angle pitch rotation.

[0039] Reference Figure 8 , the installation steps of the pitch turntable are:

[0040] 1. First make the foundation 1000mm*1000mm, with a ground hardness of 3-4.

[0041] 2. Use an impact drill φ18 to drill 100mm, with a hole spacing of 675mm*820mm.

[0042] 3. Move the pitch turntable to the installation location and place shims underneath.

[0043] 4. Fix with M16 chemical anchor bolts, then use a spirit level to level and fix.

[0044] Embodiment 2:

[0045] A design method for a pitch turntable for testing large phased array radars is proposed. The pitch turntable uses a Panasonic MHMF2000W servo motor as the power output, which is transmitted to the load through a reversing worm gear reducer (AT280, speed ratio 120) and a two-stage gear transmission (first stage 9:30:140) to make a 0°-90° pitch. Figure 3 and Figure 4 shown.

[0046] Output torque calculation:

[0047] The rated torque of Panasonic MHMF2000W servo motor is T1=9.55NM, the transmission efficiency of gear is η=0.98, and the transmission efficiency of self-locking worm is η=0.3 (0.45 in the mechanical manufacturing manual, but 0.30 in reality).

[0048] T 输出 =9.55×120×0.98×5×0.98×4.6666×0.98=25131.52NM

[0049] From the above formula, we can get that if the output torque is inversely proportional to the lever arm, the longer the lever arm, the smaller the load it carries. If the load is m = 600kg (under the limit state, all mass is concentrated at one point),

[0050] From the above formula, we can see that if the output torque is inversely proportional to the lever arm, the longer the lever arm, the smaller the load it carries. Figure 5 , such as the load is m = 600KG (in the limit state, all mass is concentrated at one point)

[0051] F 需要 = mgcosa, a<0~90°>

[0052] From the motion trajectory diagram, we can see that at point 1, the gravity and the lever arm are parallel, and the required torque is 0NM. When the load is in the process of pitching down, the angle a increases, and F increases. When a=90°, F reaches the maximum, g=9.8m / s 2 ,Right now

[0053] F 需要 =mg sin90=600×9.8*1=5880N

[0054] because:

[0055] T 实际 =F*L

[0056] So when the load is 1000KG, the designed lever arm is 1.8m.

[0057] T 实际=F*L=5880×1.8=10584NM

[0058] So when the load is 1000KG and the arm length is 2.5m. The actual torque and output torque ratio is:

[0059]

[0060] The safety factor is greater than 1, meeting the design requirements.

[0061] Gear strength check:

[0062] Strength check of two-stage transmission gears:

[0063] Rated output torque T of commutator DYNABOX90, speed ratio 30 2N =15800NM

[0064] The torque output by the servo motor is T2 = 62.328 × 30 × 0.45 = 560.952 NM, which meets the requirements from the mechanical manufacturing manual:

[0065]

[0066] Note: K H ————————Contact fatigue strength load factor, K H＝ K A K V K Hα K Hβ

[0067] T1————————is the gear transmission torque, unit NM

[0068] ————————Tooth width coefficient. Obtained from Table 8.6 of Mechanical Design.

[0069] U————————Speed ​​Ratio

[0070] Z H ————————When the pressure angle is 20°, the node area coefficient Z E ————————Elastic influence coefficient of material.

[0071] Z ε ————————Contact fatigue strength overlap coefficient

[0072] Therefore, based on the design parameters, the above values ​​are determined from the "Mechanical Design and Manufacturing Manual".

[0073] Take K A is 1; the gear accuracy is level 7 (the accuracy level range of gear transmission used in various machines in the Mechanical Manufacturing Manual), that is, K V=1.12 (determined according to the dynamic load coefficient in Figure 10-8 of the Mechanical Manufacturing Manual);

[0074] K H1＝ K A K V K Hα K Hβ =1.0×1.12×1.2×1.148=1.52912

[0075] T 2＝ 560.952NM=560952Nmm

[0076] u=3.3333

[0077] Z H =2.36

[0078] Z E =211mPa (Gear material is 40Cr, quenched and tempered)

[0079] Enter the value:

[0080]

[0081] 0.91=44.915MPa<[σ H1 ]=770MPa

[0082] So the first-stage gear parameters are as follows:

[0083]

[0084]

[0085] Secondary tooth meshing calculation:

[0086] Based on the design parameters, the above values ​​are determined from the "Mechanical Design and Manufacturing Manual".

[0087] K H1 =K A K V K Hα K Hβ =1.0×0.8×1.2×1.123=1.07808

[0088] T 3＝ 1832.259N*M=1832259Nmm

[0089] u=4.666

[0090] Z H =2.36

[0091] Z E=211mPa (gear material is 40Cr quenched and tempered)

[0092] Enter the value:

[0093]

[0094] MPa<[σ H1 ]=770MPa

[0095]

[0096] Finite element analysis of key axes:

[0097] Secondary transmission input shaft:

[0098] Reference Figure 6 The end with a larger diameter is fixed, and the other end receives the torque of 841.428N*M output by the commutator. The material is 40Cr, quenched and tempered, the maximum torsional shear stress is 1.372*10^8, the maximum deformation is 0.039mm, the minimum safety factor is 4.5, and the part design is qualified.

[0099] Pitch mounting plate:

[0100] Reference Figure 7 , 2 rectangular fulcrums and reinforcement ribs, with a pressure of 1 ton on it, material Q235, maximum stress 2.473*10^7, maximum deformation 0.1048mm, minimum safety factor 48, and the part design is qualified.

[0101] The implementation principle of the present invention is as follows: the present invention discloses a pitch turntable and a design method thereof for testing a large phased array radar. When the pitch turntable is working, the load is installed on the top plate, the dual-axis reducer drives the primary reduction pinions at both ends to rotate, the primary reduction pinions drive the primary reduction gears to rotate, thereby driving the rotating shaft to rotate between the two column plates, the rotating shaft drives the transmission gear to rotate, the transmission gear drives the secondary reduction gears to rotate, thereby causing the rotating shaft to rotate between the two column plates, causing the top plate above to perform a large angle of pitch rotation. The present invention solves the problem of inconvenient installation of large and heavy test pieces in microwave testing, solves the problem of small installation space and heavy loads, and solves the problem of safety and reliability during large load pitching.

[0102] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pitch turntable for testing a large phased array radar, comprising a base plate (1), characterized in that: A double-axis reducer (2) is installed on the base plate (1), and column plates (3) are respectively fixed on opposite sides of the base plate (1). A pitch turntable assembly (4) is rotatably connected between the two upright plates. The double-axis reducer (2) drives the pitch turntable assembly (4) to rotate at a pitch angle of 0° to 90° via a gear assembly (5).

2. The pitch turntable for testing large phased array radar according to claim 1, characterized in that: The pitch turntable assembly (4) comprises a top plate (41), a rotating shaft (42), and two secondary reduction gearwheels (43) respectively fixed at two ends of the rotating shaft (42); the two secondary reduction gearwheels (43) are respectively arranged on one side of the two column plates (3) close to each other; the rotating shaft (42) is rotatably arranged on the two column plates (3); the top plate (41) is fixed on the two secondary reduction gearwheels (43); and the gear assembly (5) is drivingly connected to the two secondary reduction gearwheels (43).

3. The pitch turntable for testing large phased array radar according to claim 2, characterized in that: The gear assembly (5) comprises two couplings (51), two primary reduction pinions (52), two primary reduction gears (53) and two transmission gears (54); The two couplings (51) are respectively mounted on the output shafts at both ends of the double-shaft reducer (2); the output shafts at both ends of the double-shaft reducer (2) respectively pass through the column plate (3) and are fixedly connected to the two primary reduction pinions (52); the primary reduction pinion (52) and the primary reduction gear (53) are meshed with each other; A rotating shaft (55) is fixed between the two primary reduction gears (53), and the rotating shaft (55) is rotatably arranged between the two column plates (3). The two transmission gears (54) are fixed on the rotating shaft (55) and mesh with the secondary reduction gear (43).

4. The pitch turntable for testing large phased array radar according to claim 1, characterized in that: A plurality of tripods (6) are detachably fixedly connected to the bottom plate (1), and one side of the tripod (6) is detachably fixed to the side wall of the column plate (3).

5. The pitch turntable for testing large phased array radar according to claim 2, characterized in that: A horizontal limiting wheel set (44) and a vertical limiting wheel set (45) are fixed to the outer side wall of the secondary reduction gear (43); a slope (31) is arranged on the top surface of the column plate (3); and a limiting groove (32) is arranged on the side surface of the column plate (3); When the top plate (41) rotates to a horizontal position, the horizontal limiting wheel set (44) abuts against the inclined surface (31); when the top plate (41) rotates to a vertical position, the vertical limiting wheel set (45) abuts against the limiting groove (32).

6. The pitch turntable for testing large phased array radar according to claim 1, characterized in that: The double-shaft reducer (2) is a worm gear reducer.

7. A method for designing a pitch turntable for testing a large phased array radar according to any one of claims 1 to 6, characterized in that: The pitch turntable adopts Panasonic MHMF2000W servo motor as power output, which is transmitted to the load through a reversing worm gear reducer (AT280, speed ratio 120) and a two-stage gear transmission (first stage 9:30:140) to perform 0°-90° pitch.

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