A blackbody on-orbit calibration device based on a lead screw, a cam and a mechanical diaphragm

Abstract

The application discloses a blackbody on-orbit calibration device based on a lead screw, a cam and a mechanical diaphragm, which comprises a lead screw assembly, a guide rail, a stepping motor, a cam groove, a mechanical diaphragm assembly, a blackbody assembly, a travel switch and a diaphragm mounting seat. The driving part composed of the lead screw assembly, the stepping motor and the guide rail is installed at a different layer from the blackbody calibration assembly composed of the blackbody assembly and the mechanical diaphragm, the movement direction of the blackbody assembly is parallel to the radial direction of the motor rotating surface but not coplanar, and the two parts are connected by the cam groove through the cam mechanism principle. The application is characterized in that the driving part assembly and the blackbody calibration execution component mounting interface are not coplanar and are allowed to be partially crossed; the driving and the blackbody calibration execution component are connected through the cam effect, and the installation environment is adaptable. The sliding lead screw and the cam groove cam line both have self-locking ability and mechanical resistance.

Description

Technical Field

[0001] This invention designs a blackbody on-orbit calibration mechanism, and in particular relates to a blackbody on-orbit calibration device based on a lead screw-cam-mechanical aperture, serving the field of on-orbit calibration for space remote sensing. Background Technology

[0002] Infrared detectors are crucial for obtaining surface temperatures and material composition of extraterrestrial objects in deep space scientific exploration. However, infrared detectors are significantly affected by the environment. The long lifespan and high reliability requirements of deep space exploration payloads place even higher demands on infrared detectors. Furthermore, the orbital environment of extraterrestrial objects and the inherent drift of scientific instruments and electronic components during deep space exploration often mean that ground-based calibration parameters alone cannot achieve high-precision observation data over a long lifespan. Spaceborne blackbody calibration is a commonly used technique for infrared detection.

[0003] Blackbody calibration mechanisms often need to withstand the dynamic environments encountered during launch, flight, and reentry, such as shocks, overloads, and vibrations. These dynamic environments act on the structures of various subsystems and components, potentially leading to structural damage, performance degradation, malfunctions, or failures. Therefore, they often require self-locking and a certain degree of mechanical resistance. Furthermore, due to the spatial layout of the load spectrometer mechanism design, the blackbody mounting position must not be coplanar with the mechanism's mounting space; sometimes, the drive components and calibration components may even need to be mounted separately. This also necessitates that the blackbody calibration mechanism have significant adaptability to different installation spaces. Summary of the Invention

[0004] This invention discloses a blackbody on-orbit calibration device based on a lead screw-cam-mechanical aperture. This device provides a solution for addressing the irregular internal shape of space remote sensing payloads and the separation of the drive motor from the actual output while ensuring reliability.

[0005] The blackbody on-orbit calibration device based on a lead screw-cam-mechanical aperture includes: a stepper motor 1-1, a motor mounting base 1-2, a coupling 1-3, a lead screw mounting base 1-4, a cam groove adapter plate 1-5, a lead screw nut assembly 1-6, a trapezoidal sliding lead screw 1-7, a bearing cover 1-8, a guide rail slider 1-9, a mechanical base 1-10, a linear guide rail 1-11, a cam aperture pressure plate 2-1, a cam groove adapter plate connecting rod 2-2, a cam groove aperture plate 2-3, a blackbody assembly 2-4, a miniature short guide rail 2-5, a miniature slider 2-6, an aperture mounting cylinder 2-7, and a blackbody guide rail mounting plate 2-8.

[0006] The cam diaphragm pressure plate 2-1, cam groove adapter plate connecting rod 2-2, cam groove diaphragm plate 2-3, blackbody assembly 2-4, miniature short guide rail 2-5, miniature slider 2-6, diaphragm mounting cylinder 2-7, blackbody guide rail mounting plate 2-8, and corresponding threaded fasteners constitute a mechanical diaphragm assembly 2 with a cam groove; the slider part of the blackbody assembly 2-4 and the arc-shaped (irregular) cam groove on the cam groove diaphragm plate 2-3 form a cam mechanism, which converts the rotational motion of the cam groove diaphragm plate 2-3 into the linear motion of the blackbody assembly 2-4 along the miniature guide rail.

[0007] The stepper motor 1-1, motor mounting base 1-2, coupling 1-3, lead screw mounting base 1-4, cam groove adapter plate 1-5, lead screw nut assembly 1-6, trapezoidal sliding lead screw 1-7, bearing cover 1-8, guide rail slider 1-9, mechanical base 1-10, and linear guide rail 1-11 constitute the lead screw-cam assembly. The stepper motor 1-1 drives the lead screw to rotate, and the rotational motion is converted into linear motion through the lead screw nut assembly 1-6 and cam groove adapter plate 1-5.

[0008] The cam groove of the cam groove adapter plate 1-5, the cam groove and bottom surface of the cam groove aperture plate 2-3, the outer surface of the cam groove adapter plate connecting rod 2-2, the threaded surface of the lead screw nut assembly 1-6, and the inner and outer ring raceways of the bearings, as well as the cylindrical surface of the cam groove adapter plate connecting rod 2-2 and the surface of the linear guide rail 1-11, need to be coated with MoS2-4 type solid lubricating material.

[0009] The cam groove of the cam groove adapter plate 1-5, the cam groove of the cam groove aperture plate 2-3, the outer surface of the cam groove adapter plate connecting rod 2-2, and the lead screw nut assembly 1-6 are made of bearing steel to match the coating process and long service life requirements of the kinematic pair.

[0010] Furthermore, the symmetry of the cam groove of the cam groove adapter plate 1-5 and the cam groove opening of the cam groove aperture plate 2-3 about the center line of the groove opening is less than 0.005, and the parallelism of the plane where the two cam groove openings are located is less than 0.005 in actual assembly measurement; the cylindricity of the cam groove adapter plate connecting rod 2-2 is less than 0.005; the parallelism of the two linear guide rails 1-11 is less than 0.005, and the parallelism of the linear guide rail 1-11 along the length direction of the guide rail and the length direction of the cam groove opening of the cam groove adapter plate 1-5 is less than 0.01.

[0011] Furthermore, the inner groove of the cam groove adapter plate 1-5, together with the cam groove adapter plate connecting rod 2-2 and the cam groove aperture plate 2-3 in the cam groove-like mechanical aperture assembly 2, form a crank-slider mechanism. The rotational motion transmitted by the lead screw drives the cam groove adapter plate 1-5 to move linearly. Since the cam groove adapter plate connecting rod 2-2 and the cam groove aperture plate 2-3 are fixedly connected, the cam groove adapter plate connecting rod 2-2 slides along the groove in the cam groove adapter plate 1-5 while simultaneously driving the cam groove aperture plate 2-3 to rotate. The rotation of the cam groove aperture plate 2-3 then makes itself the driving element of the cam mechanism. Through the three-stage motion conversion of lead screw-cam-mechanical aperture, the linear motion required by the blackbody assembly within different mounting interfaces and the rotation output by the drive motor are decomposed, while self-locking is achieved through the cam mechanism and sliding lead screw.

[0012] The beneficial effect of this invention is that it separates the installation interface from two sets of components with different motion directions and motion ranges through a three-stage motion conversion of lead screw-cam-mechanical aperture. This can meet a variety of different installation boundary conditions, has high reliability, strong adaptability to the installation interface, and good mechanical resistance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a blackbody on-orbit calibration device based on a lead screw-cam-mechanical aperture.

[0014] Figure 2 for Figure 1 A schematic diagram of a mechanical aperture assembly with a cam groove. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings through an embodiment of the invention. The present invention includes, but is not limited to, the following embodiment.

[0016] like Figure 1 , Figure 2As shown, the blackbody on-orbit calibration device based on a lead screw-cam-mechanical aperture according to the present invention includes: a stepper motor 1-1, a motor mounting base 1-2, a coupling 1-3, a lead screw mounting base 1-4, a cam groove adapter plate 1-5, a lead screw nut assembly 1-6, a trapezoidal sliding lead screw 1-7, a bearing cover 1-8, a guide rail slider 1-9, a mechanical base 1-10, a linear guide rail 1-11, a cam aperture pressure plate 2-1, a cam groove adapter plate connecting rod 2-2, a cam groove aperture plate 2-3, a blackbody assembly 2-4, a miniature short guide rail 2-5, a miniature slider 2-6, an aperture mounting cylinder 2-7, and a blackbody guide rail mounting plate 2-8. The stepper motor 1-1, motor mounting base 1-2, coupling 1-3, lead screw mounting base 1-4, cam groove adapter plate 1-5, lead screw nut assembly 1-6, trapezoidal sliding lead screw 1-7, bearing cover 1-8, guide rail slider 1-9, mechanical base 1-10, and linear guide rail 1-11 constitute an independent drive motion assembly; the cam aperture pressure plate 2-1, cam groove adapter plate connecting rod 2-2, cam groove aperture plate 2-3, blackbody assembly 2-4, miniature short guide rail 2-5, miniature slider 2-6, aperture mounting cylinder 2-7, and blackbody guide rail mounting plate 2-8 constitute an independent mechanical aperture assembly with a cam groove. The two parts of the assembly are connected and move through the grooves and protruding rods of the cam groove adapter plate 1-5, cam groove adapter plate connecting rod 2-2, and cam groove aperture plate 2-3.

[0017] Furthermore, the process of completing the blackbody on-orbit calibration of this device is as follows: The stepper motor 1-1 rotates, driving the trapezoidal sliding screw 1-7 to rotate via the coupling. Due to the thread effect, the screw nut assembly 1-6 generates linear motion along the screw axis. The cam groove adapter plate 1-5 is fixedly connected to the screw nut assembly 1-6 and moves along the screw axis together with the screw nut assembly 1-6. The inner groove of the cam groove adapter plate 1-5 cooperates with the cam groove adapter plate connecting rod 2-2. Due to the limiting effect of the aperture mounting cylinder 2-7, the cam groove aperture plate 2-3 rotates during the radial linear motion of the cam groove adapter plate connecting rod 2-2, thereby causing the blackbody assembly, which cooperates with the cam arc groove on the surface of the cam groove aperture plate 2-3, to convert the rotation into radial linear motion again. When the blackbody assembly 2-4 is located at the outer edge of the cam arc groove of the cam slot aperture plate 2-3, it is in an uncalibrated state; when the blackbody assembly 2-4 is located at the radial inner edge of the cam arc groove of the cam slot aperture plate 2-3, the blackbody assembly 2-4 is located at the center of the optical path, thereby achieving blackbody calibration.

[0018] After the entire blackbody on-orbit calibration device was assembled, space environment reliability tests were conducted, including thermal vacuum, sinusoidal, and random vibration tests. The components functioned normally before and after the tests. The thermal vacuum test conditions were -35℃ to +70℃, for 6.5 cycles. The mechanical environment test conditions are shown in Table 1.

[0019] Table 1 Test conditions

[0020]

Claims

1. A blackbody on-orbit calibration device based on a lead screw, cam, and mechanical aperture, comprising a drive assembly and a mechanical aperture-like assembly; characterized in that: The drive assembly includes a stepper motor (1-1), a motor mounting base (1-2), a coupling (1-3), a lead screw mounting base (1-4), a cam groove adapter plate (1-5), a lead screw nut assembly (1-6), a trapezoidal sliding lead screw (1-7), a bearing cover (1-8), a guide rail slider (1-9), a mechanical base (1-10), and a linear guide rail (1-11). The stepper motor (1-1) drives the trapezoidal sliding lead screw (1-7) to rotate, and the rotational motion is converted into linear motion via the lead screw nut assembly (1-6) and the cam groove adapter plate (1-5). The cam groove adapter plate (1-5) has a cam groove. This type of mechanical aperture assembly includes a cam aperture pressure plate (2-1), a cam groove adapter plate connecting rod (2-2), a cam groove aperture plate (2-3), a blackbody assembly (2-4), a miniature short guide rail (2-5), a miniature slider (2-6), an aperture mounting cylinder (2-7), and a blackbody guide rail mounting plate (2-8). The cam groove adapter plate connecting rod (2-2) is fixedly connected to the cam groove aperture plate (2-3), so that the cam groove adapter plate connecting rod (2-2) slides along the groove in the cam groove adapter plate (1-5) and drives the cam groove aperture plate (2-3) to rotate. The rotation of the cam groove aperture plate (2-3) makes itself the driving component of the cam mechanism. The cam slot aperture plate (2-3) has an arc-shaped cam slot. The slider part of the blackbody component (2-4) and the arc-shaped cam slot on the cam slot aperture plate (2-3) form a cam mechanism, which converts the rotational motion of the cam slot aperture plate (2-3) into the linear motion of the blackbody component (2-4) along the miniature short guide rail (2-5). The on-orbit calibration process is as follows: The stepper motor (1-1) rotates and drives the trapezoidal sliding screw (1-7) to rotate via the coupling (1-3). Due to the thread effect, the screw nut assembly (1-6) generates linear motion along the axial direction of the trapezoidal sliding screw (1-7). The cam groove adapter plate (1-5) is fixedly connected to the screw nut assembly (1-6) and moves along the axial direction of the trapezoidal sliding screw (1-7) together with the screw nut assembly (1-6). The inner groove of the cam groove adapter plate (1-5) cooperates with the cam groove adapter plate connecting rod (2-2). Due to the limiting effect of the aperture mounting cylinder (2-7), the cam groove aperture plate (2-5) moves along the axial direction of the trapezoidal sliding screw (1-7). -3) During the radial linear motion of the connecting rod (2-2) of the cam groove transition plate, the cam groove aperture plate (2-3) is rotated, which in turn causes the blackbody assembly (2-4) that cooperates with the cam arc groove on the surface of the cam groove aperture plate (2-3) to convert the rotation into a radial linear motion again; when the blackbody assembly (2-4) is located at the outer groove boundary of the cam arc groove of the cam groove aperture plate (2-3), it is in an uncalibrated state; when the blackbody assembly (2-4) is located at the radial inner boundary of the cam arc groove of the cam groove aperture plate (2-3), the blackbody assembly (2-4) is located at the center of the optical path, thereby achieving blackbody calibration.

2. The blackbody on-orbit calibration device based on a lead screw, cam, and mechanical aperture according to claim 1, characterized in that: The cam groove of the cam groove adapter plate (1-5), the cam groove of the cam groove aperture plate (2-3), the outer surface of the cam groove adapter plate connecting rod (2-2), the threaded pair surface of the lead screw nut assembly (1-6), the inner and outer ring raceways of the bearing, the cylindrical surface of the cam groove adapter plate connecting rod (2-2), and the surface of the linear guide rail (1-11) are all coated with MoS2-4 type solid lubricating material.

3. The blackbody on-orbit calibration device based on a lead screw, cam, and mechanical aperture according to claim 1, characterized in that: The cam groove adapter plate (1-5), cam groove aperture plate (2-3), cam groove adapter plate connecting rod (2-2), and lead screw nut assembly (1-6) are made of bearing steel.

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