A self-locking crank, cam black body on-orbit calibration mechanism

Abstract

The application discloses a self-locking crank and cam black body in-orbit calibration mechanism, which is characterized in that two ends of the mechanism are connected with a radiation black body and a low-temperature optical cold box body respectively, the black body is arranged in a light transmission hole, and other parts of the mechanism are arranged outside the light transmission hole. The mechanism comprises a crankshaft, a radiation black body shell, a cam groove black body transmission rod, a sliding guide rail, a stepping motor, a crankshaft locking pressing block, a travel switch, a motor and spring adapter plate and a mechanism mounting seat. When a detector emits, the crankshaft is located in a self-locking stroke of the cam groove, and the whole mechanism is mechanically self-locked so that the black body is located at the side of the light transmission hole; after the detector (satellite) enters an orbit, the crankshaft is driven by the stepping motor to drive out of the self-locking area, the black body is pushed into the center position of the light transmission hole through the cam groove and the guide rail, and radiation calibration is carried out. The patent solves the problem of different installation interfaces of the radiation black body and the self-locking driving mechanism under the condition of the internal limit installation space of the optical load.

Description

TECHNICAL FIELD

[0001] The application relates to an on-orbit blackbody calibration mechanism, in particular to a micro reciprocating stroke self-locking crank-cam blackbody on-orbit calibration mechanism in a limited installation space of a low-temperature optical load. BACKGROUND

[0002] An infrared waveband detector is an important means for realizing deep space scientific exploration and obtaining the surface temperature and material composition of an extraterrestrial target celestial body, but the infrared detector is greatly affected by the environment. The long service life and high reliability requirements of a deep space exploration load also put forward higher requirements on the infrared detector. The orbital environment of an extraterrestrial celestial body in a deep space exploration process and inherent drift of scientific instrument electronic devices also make it impossible to obtain long-service-life high-precision observation data only by using ground test calibration parameters. The on-orbit blackbody calibration is a common technical means for infrared detection.

[0003] The blackbody calibration mechanism often needs to be able to resist the moment or vibration caused by the detection device (satellite) active components during the launch impact of the detection device and the on-orbit operation, and therefore often needs to be self-locked. Meanwhile, due to the space layout influence of the design of the load spectrometer mechanism, the installation position of the blackbody is required to be different from the installation space of the mechanism, and the installation space is heterogeneous, which also makes the blackbody calibration mechanism need to have greater installation space adaptability. With the requirements of the load, the design difficulties of the blackbody calibration mechanism are gradually highlighted. SUMMARY

[0004] In order to overcome the design difficulties of the high-reliability self-locking blackbody calibration mechanism in the limited installation space, the application discloses a self-locking crank-cam blackbody on-orbit calibration mechanism. The patent solves the problem of different installation interfaces and design of the high-reliability radiation blackbody and the self-locking driving mechanism under the condition of considering the limited installation space inside the optical load.

[0005] The self-locking crank-cam blackbody on-orbit calibration mechanism comprises a stepping motor 1, a crankshaft 2, a motor and spring adapter plate 3, a crankshaft locking pressure block 4, a spring limiting assembly 5, a stroke switch 6, a guide rail 7, a mechanism mounting seat 8, a cam groove blackbody transmission rod 9, a guide cover 10 and a blackbody mounting shell 11.

[0006] The blackbody mounting shell 11 is located at the cantilever end of the cam groove blackbody transmission rod 9, the blackbody is mounted in the blackbody mounting shell 11, the shell is heat-insulated and connected by polyimide, and the bottom of the cam groove blackbody transmission rod 9 is mounted on the guide rail 7 for limiting the linear motion direction;

[0007] The cam groove slot of the cam groove blackbody transmission rod 9 and the crankshaft 2 constitute a cam mechanism, the crankshaft 2 is driven to rotate by the stepping motor 1 and is converted into the linear motion of the cam groove blackbody transmission rod 9 through the cam mechanism;

[0008] The crankshaft 2, crankshaft locking block 4, stroke switch 5, cam groove black body transmission rod 9, guide rail 7, spring limit component 5, installed in the closed space composed of motor and spring adapter plate 3, guide cover 10, mechanism mounting seat 8, stepper motor 1, black body mounting shell 11 is installed in the closed space composed of motor and spring adapter plate 3, guide cover 10, mechanism mounting seat 8, wherein the black body mounting shell 11 is suspended on the mechanism underside through the cam groove black body transmission rod 9, and is further installed inside the box light hole to form a hierarchical structure;

[0009] The spring limit component 5 is inverted on the motor and spring adapter plate 3, and the spring limit component 5 and the boss on the upper surface of the cam groove black body transmission rod 9 jointly constitute the spring limit. In the process of pushing the black body mounting shell 11 out to the calibration position in the forward motion of the mechanism, the top rod of the spring limit component 5 is pushed away by the crankshaft 2, so that the boss on the upper surface of the cam groove black body transmission rod 9 is separated from the top rod of the spring limit component 5 to release the limit. In the process of pulling the black body mounting shell 11 back to the original position in the reverse motion of the mechanism, the boss on the upper surface of the cam groove black body transmission rod 9 and the top rod of the spring limit component 5 restore to the limit state.

[0010] The stroke switch 5 has only one, which is located on the upper surface of the cam groove black body transmission rod 9, and the crankshaft locking block 4 is located at the shaft end of the stepper motor 1. The crankshaft 2 is pressed on the stepper motor 1 by screws, and when the crankshaft 2 moves in the cam groove of the cam groove black body transmission rod 9, the crankshaft 2 contacts the contact of the stroke switch 5 when the reciprocating motion reaches the maximum stroke, thereby controlling the rotation of the stepper motor and limiting the range of the reciprocating linear motion of the cam groove black body transmission rod 9.

[0011] Further, the stepper motor 1 requires that the bearing adopted by the motor output shaft must adopt solid lubrication, and the total runout of the motor shaft end is less than 0.005, and the motor needs to adapt to a low temperature environment of-65℃.

[0012] Further, the crankshaft 2 adopts bearing steel material, the crankshaft surface is plated with MoS2 solid lubricating film, the parallelism of the two cylindrical surfaces of the crankshaft is not higher than 0.005, and the perpendicularity of the crankshaft axis to the installation plane is not higher than 0.005.

[0013] Further, the inner surface of the cam groove of the cam groove black body transmission rod 9 is symmetrical along the slot center line, and the perpendicularity of the inner surface of the slot to the installation surface is not higher than 0.005, and the slot surface is plated with MoS2 solid lubricating film.

[0014] Further, after the linear guide rail 7 is installed, the parallelism of the two guide rails about the installation seat is not higher than 0.01, and the symmetry of the two guide rails about the installation seat is not higher than 0.005.

[0015] Furthermore, after assembly, the eccentricity between the rotational space plane of the crankshaft 2 and the center line of the cam groove of the cam groove blackbody transmission rod 9 is no higher than 0.01. During the 90° rotation of the crankshaft 2 from its initial position to the starting position of the cam groove blackbody transmission rod 9 driven by the stepper motor 1, there is a small gap between the crankshaft 2 and the cam groove of the cam groove blackbody transmission rod 9, preventing direct contact and reducing power and friction. After the crankshaft 2 moves to the starting position of the cam groove blackbody transmission rod 9, it drives the cam groove blackbody transmission rod 9 to move.

[0016] This invention is highly reliable, small in size, compact in structure, lightweight, and can be reused in various extreme spaces. Attached Figure Description

[0017] Figure 1 Schematic diagram of a self-locking crank-cam blackbody calibration mechanism;

[0018] Figure 2 A schematic diagram of the blackbody position when the self-locking crank-cam blackbody calibration mechanism is not calibrated;

[0019] Figure 3 This is a schematic diagram of the internal mechanism position state of a self-locking crank-cam blackbody calibration mechanism when it is not calibrated.

[0020] Figure 4 A schematic diagram showing the blackbody being pushed to the calibration position during calibration of a self-locking crank-cam blackbody calibration mechanism;

[0021] Figure 5 A schematic diagram showing the blackbody being pushed to the calibration position during calibration of a self-locking crank-cam blackbody calibration mechanism. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings. The present invention includes, but is not limited to, the following embodiments.

[0023] like Figure 1 As shown, the self-locking crank-cam blackbody on-rail calibration mechanism of the present invention includes: a stepper motor 1, a motor and spring adapter plate 3, a crankshaft 2, a crankshaft locking block 4, a limit switch 5, a cam groove blackbody transmission rod 9, a guide cover 10, a blackbody mounting shell 11, a guide rail 7, a spring limiting assembly 5, and a mechanism mounting base 8.

[0024] In use, the blackbody is placed inside the blackbody mounting housing 11 and fixed at one end by the cam groove blackbody drive rod 9. During the launch and on-orbit operation of the detector (satellite), before calibration, the blackbody is initially located in the initial position (self-locking limit) of the blackbody mounting housing 11. When calibration is required, a stepper motor drives the blackbody and the blackbody mounting housing 11 to move to the radiation calibration position, thereby completing the calibration.

[0025] Furthermore, such asFigure 2 , Figure 3 As shown in FIG. 1, in the emission state or in-orbit operation and non-calibration state, the crankshaft 2 is located at the bottom of the cam groove of the cam groove blackbody transmission rod 9, that is, the cam groove position of the cam groove blackbody transmission rod 9 coincides with the space rotation arc of the crankshaft 2 driven by the stepper motor, so that the crankshaft 2 cannot be moved by the cam groove blackbody transmission rod 9 due to the collinear force transmitted by the linear motion of the cam groove blackbody transmission rod 9 and the "driven part", thereby realizing mechanical self-locking. At this time, self-locking can be realized even if the motor is not powered. At the same time, the spring limiting assembly 5 and the boss on the upper surface of the cam groove blackbody transmission rod 9 constitute a limit under the action of the spring.

[0026] Further, as shown in FIG. 2, in the in-orbit calibration, the blackbody installation shell 11 is pushed to the in-orbit calibration position by the motion conversion of the cam groove blackbody transmission rod 9 when the stepper motor 1 rotates forward, and when the calibration position is reached, the travel switch 5 installed on the cam groove blackbody transmission rod 9 also moves to the calibration limit 2, so that the crankshaft 2 and the contact of the travel switch 5 are in contact when the reciprocating motion reaches the maximum stroke. When the calibration position is reached, the travel switch is triggered to stop the stepper motor. Figure 4 , Figure 5 Further, as shown in FIG. 2, in the in-orbit calibration, the blackbody installation shell 11 is pushed to the in-orbit calibration position by the motion conversion of the cam groove blackbody transmission rod 9 when the stepper motor 1 rotates forward, and when the calibration position is reached, the travel switch 5 installed on the cam groove blackbody transmission rod 9 also moves to the calibration limit 2, so that the crankshaft 2 and the contact of the travel switch 5 are in contact when the reciprocating motion reaches the maximum stroke. When the calibration position is reached, the travel switch is triggered to stop the stepper motor.

[0027] Further, after the blackbody is pushed to the calibration position with the blackbody installation shell 11, the optical member can be calibrated in-orbit by blackbody radiation, and after the calibration of the blackbody is completed, the blackbody is restored to the initial position by the stepper motor. In the in-orbit calibration, only one travel switch 5 is used to realize the reciprocating reversing control in the entire in-orbit calibration process.

[0028] Further, after the assembly of the entire mechanism is completed, the following sine vibration and random vibration mechanical tests shown in Table 1 are carried out. The functions of the mechanism components are normal before and after the tests.

[0029] Table 1 Test Conditions

[0030]

Claims

1. A self-locking crank, cam blackbody on-orbit calibration mechanism, comprising: Stepping motor (1), crankshaft (2), motor and spring adapter plate (3), crankshaft locking block (4), spring limit component (5), travel switch (6), guide rail (7), mechanism mounting seat (8), cam groove black body transmission rod (9), guide cover (10), black body mounting shell (11); characterized in that: The black body mounting shell (11) is located at the cantilever end of the cam groove black body transmission rod (9), the black body is mounted in the black body mounting shell (11), the shell is heat insulated and connected by polyimide, and the bottom of the cam groove black body transmission rod (9) is mounted on the guide rail (7) for limiting the straight line motion direction; The cam groove slot of the cam groove black body transmission rod (9) and the crankshaft (2) constitute a cam mechanism, the crankshaft (2) is driven to rotate by the stepping motor (1) and is converted into the linear motion of the cam groove black body transmission rod (9) through the cam mechanism; The crankshaft (2), crankshaft locking block (4), travel switch (6), cam groove black body transmission rod (9), guide rail (7), spring limit component (5) are mounted in the closed space composed of motor and spring adapter plate (3), guide cover (10) and mechanism mounting seat (8), and the stepping motor (1) and black body mounting shell (11) are mounted outside the closed space composed of motor and spring adapter plate (3), guide cover (10) and mechanism mounting seat (8), wherein the black body mounting shell (11) is suspended on the lower side of the mechanism through the cam groove black body transmission rod (9) and is further mounted inside the box light hole to form a hierarchical structure; The spring limit component (5) is inverted on the motor and spring adapter plate (3), the spring limit component (5) and the boss on the upper surface of the cam groove black body transmission rod (9) jointly constitute a spring limit, in the process of pushing the black body mounting shell (11) out to the calibration position in the forward motion of the mechanism, the top rod of the spring limit component (5) is pushed away by the crankshaft (2), so that the boss on the upper surface of the cam groove black body transmission rod (9) is separated from the top rod of the spring limit component (5) to release the limit, in the process of pulling the black body mounting shell (11) back to the original position in the reverse motion of the mechanism, the boss on the upper surface of the cam groove black body transmission rod (9) and the top rod of the spring limit component (5) restore to the limited state; The travel switch (6) is located on the upper surface of the cam groove blackbody transmission rod (9), the crankshaft locking block (4) is located on the shaft end of the stepper motor (1), the crankshaft (2) is pressed on the stepper motor (1) through a screw, when the crankshaft (2) moves in the cam groove of the cam groove blackbody transmission rod (9), the crankshaft (2) contacts the contact of the travel switch (6) when the reciprocating motion reaches the maximum stroke, thereby controlling the rotation of the stepper motor and limiting the range of the reciprocating linear motion of the cam groove blackbody transmission rod (9); when the stepper motor (1) rotates in the forward direction, the blackbody mounting shell (11) is pushed to the on-orbit calibration position through the motion conversion of the cam groove blackbody transmission rod (9), when the calibration position is reached, the travel switch (6) mounted on the cam groove blackbody transmission rod (9) also moves to the calibration limit 2, so that the crankshaft (2) contacts the contact of the travel switch (6) when the reciprocating motion reaches the maximum stroke; after the on-orbit calibration is completed, the stepper motor (1) rotates in the reverse direction to pull the blackbody mounting shell (11) back to the initial position; in the reciprocating motion, only one travel switch (6) is used to realize reciprocating control. When the crankshaft (2) is located at the bottom of the cam groove of the cam groove blackbody transmission rod (9), the force transmitted by the linear motion of the cam groove blackbody transmission rod (9) is collinear with the "driven part", so the crankshaft (2) cannot be pushed to move by the cam groove blackbody transmission rod (9), thereby realizing mechanical self-locking; at this time, even if the motor is not powered on, self-locking can be realized; similarly, when moving to the calibration limit position, self-locking can also be realized; during the emission of the probe and the on-orbit operation stage, when not calibrated, the blackbody is in the blackbody mounting shell (11) and is located at the initial position of the self-locking limit, when calibration is needed, the blackbody and the blackbody mounting shell (11) are driven to move to the radiation calibration position by the stepper motor, thereby completing the calibration. The axis rotation space surface of the crankshaft (2) is eccentric to the surface where the center line of the cam groove of the cam groove blackbody transmission rod (9) is located by not more than 0.01; during the cooperation of the crankshaft surface and the cam groove blackbody transmission rod (9), when the cam groove blackbody transmission rod (9) is at the initial position, the crankshaft 2 has a rotation space of ±90° which does not directly contact the inner wall of the cam groove blackbody transmission rod (9).

2. The self-locking crank-cam blackbody in-orbit calibration mechanism according to claim 1, characterized in that: The stepper motor (1) can work in a low temperature environment of-65℃, the bearing used in the internal output shaft adopts a solid lubrication method, and the total runout of the motor shaft end is less than 0.

005.

3. The self-locking crank-cam blackbody in-orbit calibration mechanism according to claim 1, characterized in that: The crankshaft (2) adopts bearing steel material, the crankshaft surface is plated with a MoS2 solid lubrication film, the parallelism of the two cylindrical surfaces of the crankshaft is not higher than 0.003, and the perpendicularity of the crankshaft axis to the mounting plane is not higher than 0.

005.

4. The self-locking crank-cam blackbody in-orbit calibration mechanism according to claim 1, characterized in that: The inner surface of the cam groove of the cam groove blackbody transmission rod (9) is symmetrical along the slot center line by not more than 0.002, the perpendicularity of the slot inner surface to the mounting surface is not higher than 0.005, and the slot surface is plated with a MoS2 solid lubrication film.

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