Large-tonnage mass center of mass moment of inertia comprehensive test bench

Abstract

The present invention provides a large-tonnage mass center of mass moment of inertia comprehensive test bench, wherein an air-floating rotation system, a lifting system and a tilting auxiliary component are arranged on the lower platform, the air-floating rotation system and the lifting system are respectively arranged at the front and rear ends of the lower platform, the tilting auxiliary component is arranged between the air-floating rotation system and the lifting system, the tilting auxiliary component can rotate forward toward the direction of the lifting system and backward toward the direction of the air-floating rotation system, an upper platform is arranged above the lower platform, the air-floating rotation system comprises an air-floating disk, a main shaft, a bipolar reduction device, a secondary planetary reduction device and a servo motor, the lower end of the main shaft is connected to the bipolar reduction device, the bipolar reduction device is connected to the secondary planetary reduction device, the secondary planetary reduction device is driven by a servo motor, and a rotary encoder is arranged at the lower end of the main shaft, so as to realize a comprehensive test bench with large load-bearing capacity, high precision and high stability.

Description

Technical Field

[0001] The invention belongs to the technical field of testing devices, and in particular relates to a comprehensive testing platform for testing the mass center of mass moment of inertia of various large satellites, spacecraft, aircraft, rocket engines and their components. Background Art

[0002] Mass characteristics are a series of mechanical characteristic parameters related to the mass of an object. Mass characteristics include mass, center of mass position, moment of inertia and product of inertia relative to a given coordinate system. These parameters are the basic inherent characteristic parameters that describe the mechanical characteristics of a product. In the development of spacecraft, these parameters need to be determined through experiments and necessary adjustments made to these parameters according to design requirements.

[0003] The commonly used test method is that the product to be tested is installed on a turntable and moves in three modes: horizontal, tilting and rotating the turntable to complete the posture conversion in the X, Y and Z directions required during the test. The measured values ​​are calculated by computer to obtain the center of mass and moment of inertia in the three directions.

[0004] There are many technical problems with the existing equipment for testing the mass center of mass rotational inertia. For example, some testing equipment cannot test large-tonnage products and has limitations; some testing equipment cannot achieve fully automatic operation. When testing large-tonnage products such as large satellites, spacecraft, aircraft, rocket engines, etc., manual operation is very labor-intensive and brings great inconvenience to the testing; some testing equipment has unreasonable design and low measurement accuracy, etc. These technical problems need to be improved. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the present invention provides a comprehensive test bench for testing the mass center of mass moment of inertia of various large satellites, spacecraft, aircraft, rocket engines, etc. and their components, which can achieve large load-bearing capacity, high precision and high stability.

[0006] The technical solution of the present invention is: a large-tonnage mass center of mass moment of inertia comprehensive test bench, including a lower platform, an air-floating rotation system, a lifting system and a tilting auxiliary component are arranged on the lower platform, the air-floating rotation system and the lifting system are respectively arranged at the front and rear ends of the lower platform, the tilting auxiliary component is arranged between the air-floating rotation system and the lifting system, the tilting auxiliary component can rotate forward in the direction of the lifting system and backward in the direction of the air-floating rotation system, an upper platform is arranged above the lower platform, the air-floating rotation system includes an air-floating disk, a main shaft, a bipolar reduction device, a secondary planetary reduction device and a servo motor 1, the air-floating disk is arranged at the center position of the upper platform, the upper end of the main shaft passes through the center of the upper platform and the air-floating disk in sequence, the lower end of the main shaft is connected to the bipolar reduction device, the bipolar reduction device is connected to the secondary planetary reduction device, the secondary planetary reduction device is driven by a servo motor 1, and a rotary encoder is arranged at the lower end of the main shaft,

[0007] The lifting system includes two lifts respectively arranged at the left and right ends of the lower platform and a bidirectional driving device for driving the two lifts to rise and fall synchronously. The upper end of the lifting screw rod of the lift is provided with a lift connection seat, and the lift connection seat is connected and fixed to the lower end surface of the upper platform.

[0008] The tilt auxiliary assembly is connected to the upper platform.

[0009] The lifting system also includes two side brackets and a mounting seat as a group of two mounting components, and they are respectively arranged corresponding to the two lifts. The two side brackets of a single group are respectively arranged on the left and right sides of the mounting seat and fixed to the mounting seat. The bottom of the side bracket is fixed to the lower platform. A movable space is provided between the bottom of the mounting seat and the lower platform. The bottom of the mounting seat is provided with a mounting hole, and a through hole is provided on the lower platform below the corresponding mounting hole. The outer shell of the lift is fixed on the mounting seat, and the lower end of the lifting screw rod passes through the mounting hole and the through hole in sequence and extends to the bottom of the lower platform.

[0010] The elevator is a worm gear screw elevator, and the bidirectional drive device is arranged between the two worm gear screw elevators. The bidirectional drive device includes two output ends with output directions opposite to each other. A connecting shaft is provided between the worm of the worm gear screw elevator and the output end. A through hole is provided on the side bracket close to the bidirectional drive device. One end of the connecting shaft is connected to the worm of the worm gear screw elevator through a coupling in the through hole, and the other end of the connecting shaft is connected to the output end through a coupling. The lifting system also includes a planetary reduction device and a second servo motor. The bidirectional drive device is connected to the planetary reduction device, and the planetary reduction device is driven by the second servo motor.

[0011] A support rod is respectively provided on the left and right edges of the lower platform near the lifting system, and an angle positioning block is respectively provided on the left and right edges of the lower platform away from the support rod at one end, and an angle positioning column matching the angle positioning block is provided above the angle positioning block, and the angle positioning column is fixed to the lower end surface of the upper platform.

[0012] The tilt auxiliary component includes two rotating shaft seats, two rotating shaft bearing seats and two pin shafts. The two rotating shaft seats are symmetrical to each other and are respectively arranged at the two ends of the middle part of the lower platform. The rotating shaft bearing seat is arranged on the rotating shaft seat and can rotate forward toward the direction of the lifting mechanism and backward toward the direction of the air floating rotation system. The upper end of the rotating shaft seat is provided with a U-shaped mounting groove, and the two side edges of the rotating shaft seat are provided with through holes. The rotating shaft bearing seat is provided with a lug connecting part and a plane fixing part. The lug connecting part is provided with a through hole, the lug connecting part is arranged in the U-shaped mounting groove and is connected and fixed by a pin shaft, and the plane fixing part is fixed to the lower end surface of the upper platform by bolts.

[0013] The air floating plate includes an upper air floating plate and a lower air floating plate. The lower air floating plate is provided with air holes. The lower air floating plate is fixed to the upper platen. The upper end of the main shaft passes through the upper platen, the lower air floating plate, and the center of the upper air floating plate in sequence and is arranged at the center of the upper air floating plate. A rotary encoder is installed at the lower end of the main shaft.

[0014] The bidirectional driving device is a T series spiral bevel gear reversing device.

[0015] The two-pole reduction device is an RV series two-pole worm gear reducer.

[0016] The present invention has the following beneficial effects:

[0017] The rotation value of the spindle is measured by a rotary encoder and converted into a rotation angle. The bipolar reduction device cooperates with the two-stage planetary reducer to achieve a rotation speed of 100:1, with a stable rotation speed, large overload capacity and high precision.

[0018] The dual output shafts of the bidirectional drive device have synchronous speed, so that the elevators connected to the two ends can rise and fall accurately and synchronously. In conjunction with the planetary reducer, the speed of tilting movement can be 25:1, with stable lifting speed, large load capacity and high precision. The lower end of the screw rod is a free end, and the inclination of the air flotation plate is determined by the rising height of the screw rod.

[0019] RV series bipolar worm reducer and worm screw lifter both have excellent self-locking function. After rotating to the test angle, the RV series bipolar worm reducer can be locked, stabilized and not loosened. After rising to the test height, the worm screw lifter can be locked, stabilized and not loosened. The self-locking function of the equipment in these two states will directly affect the measurement accuracy and make the measurement more accurate.

[0020] During the measurement of mass center of mass and moment of inertia, there is no need for re-lifting, leveling, or counterweighting, which reduces the errors caused by human intervention. The entire test process is fully automatic, which greatly shortens the measurement time, improves the safety factor, and has good uniformity and test periodicity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention in a horizontal state;

[0022] Figure 2 This is a schematic diagram of the structure of the present invention in a tilted state;

[0023] Figure 3 This is a schematic diagram of the component installation structure of the present invention;

[0024] Figure 4 A top view of the present invention;

[0025] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of AA;

[0026] Figure 6 for Figure 4 Schematic diagram of the cross-sectional structure of BB. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-6 The present invention is further described:

[0028] The technical solution of the present invention is: a large-tonnage mass center of mass moment of inertia comprehensive test bench, comprising a lower platform 1, on which an air-floating rotation system 2, a lifting system 3 and a tilting auxiliary component 4 are arranged, the air-floating rotation system 2 and the lifting system 3 are respectively arranged at the front and rear ends of the lower platform 1, the tilting auxiliary component 4 is arranged between the air-floating rotation system 2 and the lifting system 3, the tilting auxiliary component 4 can rotate forward in the direction of the lifting system 3 and backward in the direction of the air-floating rotation system 2, and an upper platform is arranged above the lower platform 1 5, the air-floating rotation system 2 includes an air-floating plate 6, a main shaft 7, a bipolar reduction device 8, a secondary planetary reduction device 9 and a servo motor 10, the air-floating plate 6 is arranged at the center position of the upper plate 5, the upper end of the main shaft 7 passes through the center of the upper plate 5 and the air-floating plate 6 in sequence, the lower end of the main shaft 7 is connected to the bipolar reduction device 8, the bipolar reduction device 8 is connected to the secondary planetary reduction device 9, the secondary planetary reduction device 9 is driven by the servo motor 10, and the lower end of the main shaft 7 is provided with a rotary encoder 11,

[0029] The lifting system 3 includes two lifts 12 respectively arranged at the left and right ends of the lower platform 1 and a bidirectional driving device 13 for driving the two lifts 12 to rise and fall synchronously. The upper end of the lifting screw 121 of the lift 12 is provided with a lift connection seat 14, and the lift connection seat 14 is connected and fixed to the lower end surface of the upper platform 5.

[0030] The tilt auxiliary component 4 is connected to the upper platform 5 .

[0031] The lifting system 3 also includes two side brackets 15 and a mounting seat 16 as a group of two mounting components, and they are respectively arranged corresponding to the two elevators 12. The two side brackets 15 of the single group are respectively arranged on the left and right sides of the mounting seat 16 and fixed to the mounting seat 16. The bottom of the side bracket 15 is fixed to the lower platform 1. A movable space 161 is provided between the bottom of the mounting seat 16 and the lower platform 1. The bottom of the mounting seat 16 is provided with a mounting hole 162. A through hole is provided on the lower platform 1 below the mounting hole 162. The outer shell of the elevator 12 is fixed on the mounting seat 16. The lower end of the lifting screw rod 121 passes through the mounting hole 162 and the through hole in sequence and extends to the bottom of the lower platform 1.

[0032] The elevator 12 is a worm gear screw elevator 120, and the bidirectional drive device 13 is arranged between the two worm gear screw elevators 120. The bidirectional drive device 13 includes two output ends 131 with output directions opposite to each other. A connecting shaft 17 is provided between the worm of the worm gear screw elevator 120 and the output end 131. A through hole is provided on the side bracket 15 close to the bidirectional drive device 13. One end of the connecting shaft 17 is connected to the worm of the worm gear screw elevator 120 through a coupling 18 in the through hole, and the other end of the connecting shaft 17 is connected to the output end 131 through the coupling 18. The lifting system 3 also includes a planetary reduction device 19 and a servo motor 20. The bidirectional drive device 13 is connected to the planetary reduction device 19, and the planetary reduction device 19 is driven by the servo motor 20.

[0033] A support rod 22 is respectively provided on the left and right edges of the lower platform 1 near the lifting system 3, and an angle positioning block 232 is respectively provided on the left and right edges of the lower platform 1 away from the support rod 22. An angle positioning column 23 matching with the angle positioning block 232 is provided above the angle positioning block 232, and the angle positioning column 23 is fixed on the lower end surface of the upper platform 5.

[0034] The tilt auxiliary component 4 includes two rotating shaft seats 24, two rotating shaft bearing seats 25 and two pins 26. The two rotating shaft seats 24 are symmetrical to each other and are respectively arranged at the two ends of the middle part of the lower platform 1. The rotating shaft bearing seat 25 is arranged on the rotating shaft seat 24 and can rotate forward toward the direction of the elevator 12 and backward toward the direction of the air floating rotating system 2. The upper end of the rotating shaft seat 24 is provided with a U-shaped mounting groove 241, and the two sides of the rotating shaft seat 24 are provided with through holes 242. The rotating shaft bearing seat 25 is provided with a lug connecting portion 251 and a plane fixing portion 252. The lug connecting portion 251 is provided with a through hole 242. The lug connecting portion 251 is arranged in the U-shaped mounting groove 241 and is connected and fixed by the pin 26. The plane fixing portion 252 is fixed to the lower end surface of the upper platform 5 by bolts.

[0035] The air floating plate 6 includes an upper air floating plate 61 and a lower air floating plate 62. The lower air floating plate 62 is provided with an air hole 63. The lower air floating plate 62 is fixed to the upper platen 5. The upper end of the main shaft 7 passes through the upper platen 5, the lower air floating plate 62, and the center of the upper air floating plate 61 in sequence and is arranged at the center of the upper air floating plate 61. The lower end of the main shaft 7 is installed with a rotary encoder 11.

[0036] The bidirectional driving device 13 is a T series spiral bevel gear reversing device 130 .

[0037] The two-pole reduction device 8 is an RV series two-pole worm gear reducer 80 .

[0038] The best implementation method of the present invention:

[0039] 1. When measuring the mass center of mass, the upper platen 5 is in a horizontal state for measurement. After the test is completed, the rising button is pressed to start the servo motor 20, which drives the planetary reducer, the T series spiral bevel gear commutator, and the two worm gear screw lifters 120 in sequence. The lifting screw 121 lifts the upper platen 5 up, and the upper platen 5 rises to the tested inclination angle and then stops rising. The connection parts of the worm gear screw lifter 120 are self-locking and locked to perform the inclination measurement;

[0040] After the test is completed, the descending button is pressed to start the servo motor 20, which in turn drives the planetary reducer, the T series spiral bevel gear reversing device 130, and the two worm gear screw elevators 120, and the lifting screw 121 descends to make the upper platen 5 horizontal.

[0041] 2. When the moment of inertia test is performed, the upper platen 5 is in a horizontal state, high-pressure gas is introduced into the lower air floating plate 62, and the servo motor 10 is started, which drives the secondary planetary reducer, the RV series bipolar worm gear reducer 80, and the main shaft 7 in turn. The main shaft 7 drives the upper air floating plate 61 to rotate, and the rotary encoder 11 measures the rotation angle at the same time. After rotating to the test angle, the rotation stops. The various connection parts of the RV series bipolar worm gear reducer 80 are self-locking and locked, and then the measurement is performed. The upper air floating plate 61 can be rotated to 0°, 45°, 90°, 180°, and 270° for measurement;

[0042] Press the up button to start the worm gear screw lift 120 to rise, and the upper platen 5 rises to the tested inclination angle and then stops rising. The various connecting parts of the worm gear screw lift 120 are self-locking and locked, and then the main shaft 7 is started to rotate to drive the upper air floating plate 61 to rotate. At the same time, the rotary encoder 11 measures the rotation angle, and stops rotating after rotating to the tested angle. The various connecting parts of the RV series bipolar worm gear reducer 80 are self-locking and locked, and then measurement is performed. The upper air floating plate 61 can be rotated to 0°, 45°, 90°, 180°, and 270° respectively for inclination measurement. After the measurement is completed, the servo motor 20 is turned off, and the down button is pressed to make the upper platen 5 horizontal.

[0043] Beneficial effects of the present invention: The rotation value of the spindle 7 is measured by the rotary encoder 11 and converted into a rotation angle. The bipolar reduction device 8 cooperates with the two-stage planetary reducer to achieve a rotation speed of 100:1, with a stable rotation speed, large overload bearing capacity and high precision;

[0044] The bidirectional drive device 13 has a dual output shaft with synchronous speed, so that the elevator 12 connected to both ends can accurately rise and fall synchronously. In cooperation with the planetary reducer, the speed of the tilting movement can be 25:1, with a stable lifting speed, large load capacity and high precision. The lower end of the screw is a free end, and the inclination of the air floating plate 6 is determined by the rising height of the screw.

[0045] RV series bipolar worm gear reducer 80 and worm gear screw lift 120 both have excellent self-locking function. After rotating to the test angle, the RV series bipolar worm gear reducer 80 can be well locked, stabilized, and not loosened. After rising to the test height, the worm gear screw lift 120 can be well locked, stabilized, and not loosened. The self-locking function of the equipment in these two states will directly affect the measurement accuracy and make the measurement more accurate.

[0046] During the measurement of mass center of mass and moment of inertia, there is no need for re-lifting, leveling, or counterweighting, which reduces the errors caused by human intervention. The entire test process is fully automatic, which greatly shortens the measurement time, improves the safety factor, and has good uniformity and test periodicity.

Claims

1. A large-tonnage mass center of mass moment of inertia comprehensive test bench, including a lower platform, characterized in that: An air-floating rotating system, a lifting system and a tilting auxiliary component are provided on the lower platen. The air-floating rotating system and the lifting system are respectively provided at the front and rear ends of the lower platen. The tilting auxiliary component is provided between the air-floating rotating system and the lifting system. The tilting auxiliary component can rotate forward in the direction of the lifting system and backward in the direction of the air-floating rotating system. An upper platen is provided above the lower platen. The air-floating rotating system comprises an air-floating disk, a main shaft, a bipolar reduction device, a secondary planetary reduction device and a servo motor 1. The air-floating disk is provided at the center position of the upper platen. The upper end of the main shaft passes through the center of the upper platen and the air-floating disk in sequence. The lower end of the main shaft is connected to the bipolar reduction device, which is connected to the secondary planetary reduction device. The secondary planetary reduction device is driven by a servo motor 1. A rotary encoder is provided at the lower end of the main shaft. The lifting system includes two lifts respectively arranged at the left and right ends of the lower platform and a bidirectional driving device for driving the two lifts to rise and fall synchronously. The upper end of the lifting screw rod of the lift is provided with a lift connection seat, and the lift connection seat is connected and fixed to the lower end surface of the upper platform. The tilt auxiliary assembly is connected to the upper platform; The lifting system also includes two side brackets and a mounting seat as a group, a total of two groups of mounting components, and they are respectively set corresponding to the two lifts. The two side brackets of a single group are respectively arranged on the left and right sides of the mounting seat and fixed to the mounting seat. The bottom of the side bracket is fixed to the lower platform. A movable space is provided between the bottom of the mounting seat and the lower platform. The bottom of the mounting seat is provided with a mounting hole, and a through hole is provided below the corresponding mounting hole on the lower platform. The outer shell of the lift is fixed on the mounting seat, and the lower end of the lifting screw rod passes through the mounting hole and the through hole in sequence and extends to the bottom of the lower platform. The lift is a worm gear screw lift, the bidirectional drive device is arranged between the two worm gear screw lifts, the bidirectional drive device includes two output ends with output directions opposite to each other, a coupling shaft is arranged between the worm of the worm gear screw lift and the output end, a through hole is arranged on the side bracket close to the bidirectional drive device, one end of the coupling shaft is connected to the worm of the worm gear screw lift through a coupling in the through hole, and the other end of the coupling shaft is connected to the output end through a coupling, the lifting system also includes a planetary reduction device and a second servo motor, the bidirectional drive device is connected to the planetary reduction device, and the planetary reduction device is driven by the second servo motor; A support rod is respectively provided at the left and right edges of the lower platform near the lifting system, and an angle positioning block is respectively provided at one end of the left and right edges of the lower platform away from the support rod, and an angle positioning column matched with the angle positioning block is provided above the angle positioning block, and the angle positioning column is fixed to the lower end surface of the upper platform; The tilt auxiliary component includes two rotating shaft seats, two rotating shaft bearing seats and two pin shafts. The two rotating shaft seats are symmetrical to each other and are respectively arranged at the two ends of the middle part of the lower platform. The rotating shaft bearing seat is arranged on the rotating shaft seat and can rotate forward toward the direction of the lifting mechanism and backward toward the direction of the air floating rotating system. The upper end of the rotating shaft seat is provided with a U-shaped mounting groove, and the two side edges of the rotating shaft seat are provided with through holes. The rotating shaft bearing seat is provided with a lug connecting part and a plane fixing part. The lug connecting part is provided with a through hole, the lug connecting part is arranged in the U-shaped mounting groove and is connected and fixed by a pin shaft, and the plane fixing part is fixed to the lower end surface of the upper platform by bolts; The air floating plate includes an upper air floating plate and a lower air floating plate, the lower air floating plate is provided with air holes, the lower air floating plate is fixed to the upper platen, the upper end of the main shaft sequentially passes through the upper platen, the lower air floating plate, and the center of the upper air floating plate is arranged at the center of the upper air floating plate, and the lower end of the main shaft is installed with a rotary encoder; The bidirectional drive device is a T series spiral bevel gear reversing device; The bipolar reduction device is an RV series bipolar worm gear reducer; When measuring the mass center of mass, the upper platen is in a horizontal state for measurement. After the test is completed, press the rising button to start the second servo motor, which drives the planetary reducer, T series spiral bevel gear commutator, and two worm gear screw lifters in sequence. The lifting screw lifts the upper platen up until it rises to the tested inclination angle and then stops rising. The various connection parts of the worm gear screw lifters are self-locking and locked to perform the inclination measurement. After the test is completed, press the descend button to start the second servo motor, which in turn drives the planetary reducer, the T series spiral bevel gear reversing device, and the two worm screw elevators. The elevator screws descend to make the upper platen horizontal. When the moment of inertia test is carried out, the upper platen is in a horizontal state, high-pressure gas is introduced into the lower air floating plate, and the servo motor 1 is started, which drives the secondary planetary reducer, the RV series bipolar worm gear reducer, and the main shaft in turn. The main shaft drives the upper air floating plate to rotate, and the rotary encoder measures the rotation angle at the same time. After rotating to the test angle, the rotation stops, and the various connection parts of the RV series bipolar worm gear reducer are self-locked and locked. Then the measurement is carried out. The upper air floating plate 61 can be rotated to 0°, 45°, 90°, 180°, and 270° respectively for measurement; Press the up button to start the worm gear screw lift to rise, and the upper platen will stop rising after rising to the tested inclination angle. The connecting parts of the worm gear screw lift will be self-locking and locked, and then the main shaft will be started to rotate to drive the upper air floating plate to rotate. At the same time, the rotary encoder will measure the rotation angle, and it will stop rotating after rotating to the tested angle. The connecting parts of the RV series bipolar worm gear reducer will be self-locking and locked, and then measurement will be carried out. The upper air floating plate 61 can be rotated to 0°, 45°, 90°, 180°, and 270° respectively for inclination measurement. After the measurement is completed, turn off servo motor 2 and press the down button to make the upper platen horizontal.

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