Airborne wide-temperature high-precision photoelectric stabilized platform
By improving the materials and layout of the optoelectronic stabilization platform, the problems of frame rigidity and servo system bandwidth were solved, achieving high-precision optoelectronic imaging, adapting to harsh environments, and meeting the space and weight requirements of UAV systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-03
- Publication Date
- 2026-03-27
AI Technical Summary
The existing two-axis, two-frame optoelectronic stabilization platform has insufficient frame rigidity, low servo system bandwidth, poor stabilization accuracy, and cannot adapt to large temperature difference conditions, which affects the imaging quality of the optoelectronic payload.
The shafts and bearings of the azimuth and pitch axis components are made of titanium alloy, the azimuth frame is made of silicon-aluminum alloy, the shock absorbers of the shock absorption system are arranged near the center of gravity of the equipment, the modular design allows each component to be assembled independently, and a high-precision metal grating encoder and torque motor direct drive are used.
Maintaining high dimensional stability and system stability accuracy under large temperature difference conditions reduces external disturbances, shortens assembly cycle, improves assembly accuracy, and achieves high stability and lightweight design.
Smart Images
Figure CN224045463U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to photoelectric detection technical field especially relates to a kind of airborne wide temperature high-precision photoelectric stable platform. BACKGROUND
[0002] In informatization today, the military strength of enemy and me of modern military war is constantly improved, so the performance improvement requirement of weapon assembly is endless. For photoelectric stable platform, it is required that its reconnaissance range is wider, distance is farther, aircraft flight height is higher, the ability to adapt to harsh environment is stronger, the image and video information obtained are clearer and more effective, so higher gazing axis stability precision requirement is proposed to platform control system. As the "eyes" of unmanned reconnaissance aircraft, airborne high-precision photoelectric stable platform is an important equipment in unmanned aerial vehicle system, can carry visible light, infrared, laser and other photoelectric precision load, and directly blocks them from external environment to ensure normal work. At present, the demand for multi-light path integration, long focal length and large aperture photoelectric load is more and more intense, however, the space of unmanned aerial vehicle system is compact, and the load is low, so the requirement for stable platform is more stringent, so two-axis two-frame photoelectric stable platform becomes an important part of airborne search and tracking system.
[0003] The commonly used two-axis two-frame photoelectric stable platform does not arrange damper at the mass center position of equipment, the attribute matching of shafting support material and bearing material is inconsistent, the frame rigidity is insufficient, so that the bandwidth of servo system is low, the stability precision is poor, it cannot adapt to large temperature difference condition, and the high imaging quality of photoelectric load cannot be guaranteed. UTILITY MODEL CONTENT
[0004] Therefore, the utility model provides an airborne wide temperature high-precision photoelectric stable platform to solve the problems of insufficient frame rigidity, low servo system bandwidth, poor stability precision, inability to adapt to large temperature difference condition and inability to guarantee the high imaging quality of photoelectric load in the prior art.
[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:
[0006] An airborne wide temperature high-precision photoelectric stable platform, the platform comprises: azimuth shafting assembly, azimuth drive box, damping system assembly, fiber optic gyroscope, servo control box, pitch shafting assembly and azimuth frame;The fixed end of the azimuth shafting assembly is connected with the damping system assembly, and the rotating end of the azimuth shafting assembly is connected with the azimuth frame;The azimuth drive box is arranged on the damping system assembly;The servo control box is arranged in the azimuth frame;The pitch shafting assembly is arranged in the azimuth frame;The fiber optic gyroscope is installed in the azimuth frame.
[0007] Further, the azimuth axis system assembly comprises an azimuth rotating shaft and an angular position sensor; the angular position sensor is arranged on the azimuth rotating shaft; the azimuth rotating shaft is directly driven by a torque motor, and is mounted by back-to-back angular contact bearings; inner rings and outer rings between the two bearings are respectively provided with spacer rings; the inner ring is assembled with the azimuth rotating shaft by interference; and the outer ring is matched with the bearing seat by clearance.
[0008] Further, the azimuth rotating shaft is realized by measuring the distance from the outer ring end face of the angular contact bearing to the end face of the bearing seat and grinding the gland end face of the angular contact bearing outer ring; one end face of the angular contact bearing inner ring is in contact with the shoulder of the azimuth rotating shaft; the distance from the other end face of the angular contact bearing inner ring to the end face of the azimuth rotating shaft is measured; the gland end face of the angular contact bearing inner ring is ground; the height of the inner ring spacer ring is adjusted; and the protrusion amount of the angular contact bearing inner ring is adjusted to adjust the axial pre-tightening of the angular contact bearing.
[0009] Further, the damping system assembly comprises dampers and a damper frame; three dampers form a group, and two groups are arranged on the two sides of the damper frame; the movable flange of the damper is connected with the damper frame, the fixed end flange is connected with the external base, and the movable flange and the fixed end flange are arranged at 90°.
[0010] Further, the three dampers form a spatial triangular structure, and the intersection of the diagonal lines is located at the mass center position of the whole machine.
[0011] Further, the surface of the damping system assembly is provided with a plurality of mounting holes and a plurality of lightening grooves.
[0012] Further, the azimuth frame is made of silicon-aluminum alloy.
[0013] Further, the pitch axis system assembly comprises a motor end shaft system and an encoder end shaft system; the motor end shaft system is directly driven by a torque motor and is matched with a deep groove ball bearing as a moving end support; the encoder end shaft system is matched with a pair of back-to-back angular contact bearings as a fixed end support; the fixed end of the motor end shaft system and the encoder end shaft system is connected with the azimuth frame, and the moving end is connected with an optical load.
[0014] Further, the encoder end shaft system is provided with a metal grating encoder.
[0015] Compared with the prior art, the utility model can achieve the following beneficial effects:
[0016] 1. The shafts of the azimuth shaft assembly and the elevation shaft assembly and the bearing seat and other parts are made of titanium alloy material, the azimuth frame is made of silicon-aluminum alloy, the material properties are matched and close, the high dimensional stability of the optoelectronic stable platform under a large temperature difference can be ensured, and thus the system maintains high stable precision;
[0017] 2. The damping system assembly is arranged at the centroid of the equipment, external disturbance can be effectively reduced, the system angular displacement is controlled, and the occupied space is small;
[0018] 3. Each assembly is modularized and can be independently assembled, the assembly period is shortened, the assembly and adjustment difficulty is reduced, and the assembly precision of the system is improved;
[0019] 4. As a two-axis two-frame structure, the system has high stable precision, is light in weight, small in size, high in carrying capacity, and can realize forward image motion compensation, search, stabilization and tracking of different distance targets and other functions. BRIEF DESCRIPTION OF DRAWINGS
[0020] The drawings constituting a part of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation of the present application. In the drawings:
[0021] Figure 1 A structure schematic diagram of an airborne wide-temperature high-precision optoelectronic stable platform according to an embodiment of the present application;
[0022] Figure 2 A structure schematic diagram of an azimuth shaft assembly according to an embodiment of the present application;
[0023] Figure 3 A structure schematic diagram of a damping system assembly according to an embodiment of the present application;
[0024] Figure 4 A structure schematic diagram of a motor end shaft assembly in an elevation shaft assembly according to an embodiment of the present application;
[0025] Figure 5 A structure schematic diagram of an encoder end shaft assembly in an elevation shaft assembly according to an embodiment of the present application;
[0026] Figure 6 A structure schematic diagram of an azimuth frame according to an embodiment of the present application;
[0027] Figure 7 A schematic diagram of an optoelectronic load carried according to an embodiment of the present application.
[0028] Explanation of reference signs:
[0029] 1. Azimuth shaft assembly, 1-1, fixed end interface, 1-2, rotating end interface, 2, azimuth drive box, 3, damping system assembly, 3-1, damper, 3-2, damper frame, 3-3, mounting interface, 3-4, screw, 3-5, movable flange, 3-6, fixed end flange, 4, fiber optic gyroscope, 5, servo control box, 6, motor end shaft, 6-1, motor end shaft moving end, 6-2, motor end shaft fixed end, 7, azimuth frame, 8, encoder end shaft, 8-1, encoder end shaft moving end, 8-2, encoder end shaft fixed end, 9, photoelectric load. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical scheme and advantages of the utility model more clear and understandable, the utility model will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and do not constitute a limitation on the utility model. In different embodiments, similar elements are associated with similar element numbers. In the following embodiments, many details are described in order to make the utility model better understood. However, those skilled in the art can easily realize that some features can be omitted in different cases, or can be replaced by other elements, materials or methods. In some cases, some operations related to the utility model are not shown or described in the specification in order to avoid the core part of the utility model being overwhelmed by too much description, and detailed description of the related operations is not necessary for those skilled in the art, and the related operations can be fully understood according to the description in the specification and general technical knowledge in the art.
[0031] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.
[0032] As Figure 1 shown, an airborne wide-temperature high-precision photoelectric stable platform, the platform comprises: azimuth shaft assembly 1, azimuth drive box 2, damping system assembly 3, fiber optic gyroscope 4, servo control box 5, pitch shaft assembly and azimuth frame 7;The fixed end interface 1-1 of the azimuth shaft assembly 1 is connected with the mounting interface 3-3 of the damping system assembly 3, and the rotating end interface 1-2 of the azimuth shaft assembly 1 is connected with the azimuth frame 7;Azimuth drive box 2 is arranged on the damping system assembly 3;Servo control box 5 is arranged in the azimuth frame 7;Pitch shaft assembly is arranged in the azimuth frame 7;Fiber optic gyroscope 4 is installed in the azimuth frame 7.
[0033] As Figure 2As shown, the azimuth axis system assembly 1 comprises: an azimuth rotating shaft and an angular position sensor; the angular position sensor is arranged on the azimuth rotating shaft; the azimuth rotating shaft is directly driven by a torque motor, and is mounted by back-to-back angular contact bearings, and a spacer ring is arranged between the inner ring and the outer ring of the two bearings; the inner ring is assembled with the azimuth rotating shaft by interference, and the outer ring is matched with the bearing seat by clearance; the radial and axial spans of the angular contact bearings are large and arranged below the azimuth axis system, close to the azimuth frame 7, the rotation force arm is short, the support stiffness of the photoelectric load 9 is large, and the control accuracy of the servo system can be effectively improved. The angular position sensor adopts a high-precision metal grating encoder; the cable can be led out through the conductive ring to realize 360-degree continuous rotation.
[0034] The azimuth rotating shaft realizes the tight assembly of the outer ring of the angular contact bearing by measuring the distance from the end face of the outer ring of the angular contact bearing to the end face of the bearing seat and grinding the gland end face of the outer ring of the angular contact bearing; one end face of the inner ring of the angular contact bearing is in contact with the shoulder of the azimuth rotating shaft, the distance between the other end face of the inner ring of the angular contact bearing and the end face of the azimuth rotating shaft is measured, the gland end face of the inner ring of the angular contact bearing and the height of the inner ring spacer ring are ground, and the protrusion amount of the inner ring of the angular contact bearing is adjusted to adjust the axial pre-tightening of the angular contact bearing.
[0035] As shown in Figure 3 The damping system assembly 3 comprises: a damper 3-1 and a damper frame 3-2; three dampers 3-1 form a group, and are arranged on the mounting surfaces on the two sides of the damper frame 3-2 by two groups of screws 3-4; the connecting surface of the azimuth axis system assembly 1 is connected with the upper end surface of the damper frame 3-2; the moving flange 3-5 of the damper 3-1 is connected with the damper frame 3-2, and the fixed end flange 3-6 is connected with the external base.
[0036] Among them, the three dampers 3-1 form a spatial triangular structure, the diagonal intersection point is located at the mass center position of the whole machine, the angular displacement of the servo system can be effectively controlled, the support stiffness of the servo system is improved, and the stability accuracy of the servo system is improved. Moreover, the surface of the damping system assembly 3 is provided with a plurality of mounting holes and weight reduction grooves.
[0037] As shown in Figure 4 and Figure 5 The pitch axis system assembly comprises: a motor end shaft system 6 and an encoder end shaft system 8; the motor end shaft system 6 is directly driven by a torque motor and is matched with deep groove ball bearings as a moving end support, and the outer ring is open; the encoder end shaft system 8 adopts a pair of back-to-back angular contact bearings as a fixed end support, the fixed end of the motor end shaft fixed end 6-2 and the fixed end of the encoder end shaft fixed end 8-2 are connected with the azimuth frame 7, and the motor end shaft moving end 6-1 and the encoder end shaft moving end 8-1 are respectively connected with the photoelectric load 9, which can ensure that the deformation of the photoelectric load is not constrained under the condition of large temperature difference, avoids the pulling of the photoelectric load due to the thermal expansion and contraction of parts such as the azimuth frame 7, and thus the stress deformation of the lens in the photoelectric load leads to the decline of the lens surface shape, which affects the imaging quality.
[0038] As Figure 6 shown, the azimuth frame 7 adopts silicon-aluminum alloy, the density is 2.3g / cm 3 , the elastic modulus is 103Gpa, the rigidity is large, the semi-closed lightweight structure is adopted, compared with aluminum alloy material under the same structure, the weight is 0.7kg lighter, the first order mode can be improved by 15Hz; the linear expansion coefficient is low, and the material properties are close to the shaft system. The azimuth direction adopts high-precision fiber-optic gyroscope 4 fixed to the azimuth frame 7, the pitch gyroscope can be installed on the optoelectronic load 9, this arrangement can effectively improve the control accuracy of the servo system. The azimuth frame 7 provides the mounting interface and cable fixing hole of the azimuth shaft system and the pitch shaft system and the like components, adopts the semi-closed lightweight structure, the cable of the optoelectronic load 9 can be led out from the pitch shaft hole, and is led out through the conductive ring.
[0039] The azimuth drive box 2 and the servo control box 5 both adopt closed design, the circuit board is sealed in the structure shell, the modular design improves the electromagnetic shielding effectiveness.
[0040] The shaft system of the airborne wide-temperature high-precision optoelectronic stable platform can shake within 5 seconds, the shaft system orthogonality can be within 10 seconds, the shaft system shakes within 5 seconds, and the servo system stable precision can be within 15 micro-radians.
[0041] As Figure 7 shown, the platform can carry the optoelectronic load 9 with a rotary diameter of φ325mm and a load of 30kg, the total weight of the stable platform is not greater than 20kg, the azimuth shaft system can realize 360° continuous rotation, and the pitch shaft system can realize rotation within a large angle from horizontal 0° to downward.
[0042] The above specific embodiments do not constitute a limitation on the protection scope of the utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement within the spirit and principles of the utility model should be included in the protection scope of the utility model.
Claims
1. An airborne wide-temperature high-precision photoelectric stabilization platform, characterized in that: The platform comprises an azimuth shaft assembly, an azimuth drive box, a damping system assembly, an optical fiber gyroscope, a servo control box, a pitch shaft assembly and an azimuth frame; the fixed end of the azimuth shaft assembly is connected with the damping system assembly, and the rotating end of the azimuth shaft assembly is connected with the azimuth frame; the azimuth drive box is arranged on the damping system assembly; the servo control box is arranged in the azimuth frame; the pitch shaft assembly is arranged in the azimuth frame; and the optical fiber gyroscope is installed in the azimuth frame.
2. The airborne wide-temperature high-precision optoelectronic stable platform according to claim 1, characterized in that, The azimuth shaft assembly comprises an azimuth rotating shaft and an angular position sensor; the angular position sensor is arranged on the azimuth rotating shaft; the azimuth rotating shaft is directly driven by a torque motor, and is installed by using angular contact bearings back to back; a spacer ring is arranged between the inner ring and the outer ring of the two bearings; the inner ring is assembled with the azimuth rotating shaft in interference fit; and the outer ring is matched with the bearing seat in clearance fit; and the angular position sensor adopts a high-precision metal grating encoder.
3. The airborne wide-temperature high-precision optoelectronic stable platform according to claim 2, characterized in that, The azimuth rotating shaft is realized by measuring the distance from the outer ring end face of the angular contact bearing to the end face of the bearing seat and grinding the gland end face of the outer ring of the angular contact bearing; one end face of the inner ring of the angular contact bearing is in contact with the shoulder of the azimuth rotating shaft; the distance between the other end face of the inner ring of the angular contact bearing and the end face of the azimuth rotating shaft is measured; the gland end face of the inner ring of the angular contact bearing and the height of the inner ring spacer ring are ground; and the protrusion amount of the inner ring of the angular contact bearing is adjusted to adjust the axial pre-tightening of the angular contact bearing.
4. The airborne wide-temperature high-precision optoelectronic stable platform according to claim 1, characterized in that, The damping system assembly comprises dampers and a damper frame; three dampers form a group, and two groups are arranged on the two sides of the damper frame; the movable flange of the damper is connected with the damper frame, the fixed end flange is connected with the external base, and the movable flange of the damper is arranged at 90° with the fixed end flange.
5. The airborne wide-temperature high-precision optoelectronic stable platform according to claim 4, characterized in that, The three dampers form a spatial triangular structure, and the intersection of the diagonal lines is located at the mass center position of the whole machine.
6. The airborne wide-temperature high-precision optoelectronic stable platform according to claim 4, characterized in that, The surface of the damping system assembly is provided with a plurality of mounting holes and a plurality of lightening grooves.
7. The airborne wide-temperature high-precision optoelectronic stable platform according to claim 1, characterized in that, The azimuth frame is made of silicon-aluminum alloy.
8. The airborne wide-temperature high-precision optoelectronic stable platform according to claim 1, characterized in that, The pitch shaft assembly comprises a motor end shaft assembly and an encoder end shaft assembly; the motor end shaft assembly is directly driven by a torque motor and is matched with deep groove ball bearings as the motion end support; the encoder end shaft assembly is matched with a pair of angular contact bearings installed back to back as the fixed end support; the fixed end of the motor end shaft assembly and the encoder end shaft assembly is connected with the azimuth frame, and the motion end is connected with the photoelectric load.
9. The airborne wide-temperature high-precision optoelectronic stable platform according to claim 8, characterized in that, The encoder end shaft assembly is installed with a metal grating encoder.