A direct-drive bistable cut-in or cut-out type unbalance load scaling device

Abstract

The application relates to a calibration mechanism, in particular to a direct-drive double-stable cut-in or cut-out type eccentric load calibration device, which solves the technical problems of the existing calibration mechanism, such as no on-orbit emergency measures, low reliability, large volume and weight, complex transmission and small temperature difference range. The direct-drive double-stable cut-in or cut-out type eccentric load calibration device comprises a base, an emergency reset mechanism, a driving motor, a rotating shaft, a load for shielding a light path during on-orbit calibration, a radial cold shield mechanism, a pin puller and a position sensor; the emergency reset mechanism is located at the upper end of the base; the driving motor is located at the lower end of the base; the upper end of the rotating shaft is matched with the emergency reset mechanism, and the lower end of the rotating shaft is connected with the driving motor; one side edge of the load is fixedly connected with the middle part of the rotating shaft and can rotate with the rotating shaft; the radial cold shield mechanism is fixedly connected with the base; and the pin puller is arranged on the emergency reset mechanism.

Description

Technical Field

[0001] This invention relates to a calibration mechanism, specifically to a direct-drive bistable cut-in or cut-out type off-center load calibration device. Background Technology

[0002] After medium- and long-wave remote sensing payloads are launched into orbit, their performance changes due to factors such as the space environment, their own aging, and fluctuations in dark current caused by non-uniformity in the detector response, severely affecting image quality. Therefore, relative and absolute radiometric calibration using surface-source blackbody and graybody sensors is necessary. Conventional calibration methods involve directly or indirectly introducing the radiation from the blackbody or graybody into the main optical path system through rotation, translation, or other means.

[0003] The mechanism performing this function, whether translation or rotation, generally uses a "stepper motor + transmission device" scheme, and usually employs static balancing counterweights for the load. This scheme, due to the addition of transmission components such as gears, racks, worm gears, worm shafts, cams, and crank-slider mechanisms, is highly complex and reduces on-orbit reliability. Furthermore, these schemes typically only have high-temperature calibration points (20°C above room temperature, 293K), lacking low-temperature points, resulting in small temperature differences. Moreover, the mechanism lacks emergency measures; if a malfunction occurs after entering the optical path, it cannot exit the optical path, leading to camera failure. Chinese patent CN110864707B proposes a "high-reliability, high-self-locking calibration mechanism," which adds a crank-rocker mechanism, thus reducing reliability. The introduced torsion spring increases the mechanism's resistance torque, and the long-term cyclic action of the torsion spring poses a risk of failure. Chinese patent CN110806267A proposes a "cut-in type spaceborne large field-of-view infrared camera calibration mechanism." This patent adds a harmonic reducer, and the drive shaft and cylindrical compression spring are not decoupled, resulting in the same drawbacks as patent CN110864707B. Its temperature point is 100℃ (373K), which is a single temperature range. Chinese patent CN116625525A proposes a "self-locking crank, cam, blackbody on-orbit calibration mechanism." In addition to introducing a crank-slider mechanism, it also adds a sliding guide rail, cam, and limit spring. It is very compact but highly complex, and there is a risk that a single point of failure could cause the entire mechanism to fail. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems of existing calibration mechanisms, such as lack of on-orbit emergency measures, low reliability, large size and weight, complex transmission, and small temperature difference range, and to provide a direct-drive bistable cut-in or cut-out type off-center load calibration device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A direct-drive bistable cut-in or cut-out type off-center load calibration device is characterized by including a base, an emergency reset mechanism, a drive motor, a rotating shaft, a load for blocking the light path during on-orbit calibration, a cooling cover mechanism, a pin puller, and a position sensor.

[0007] The emergency reset mechanism is located at the upper end of the base;

[0008] The drive motor is located at the lower end of the base;

[0009] The upper end of the rotating shaft is connected to the emergency reset mechanism, and the lower end is connected to the drive motor.

[0010] The load side is fixedly connected to the middle of the shaft and can rotate with the shaft;

[0011] The radiant cooling shroud mechanism is fixed to the base and is used to house the load after the optical path is cut out, and to provide radiant cooling to the load when it is cut out.

[0012] The pin puller is installed on the emergency reset mechanism and is used to open the emergency reset mechanism in case of control circuit failure.

[0013] The position sensor includes a Hall element and two magnetic elements. The Hall element is fixed to the rotating shaft and rotates around the rotating shaft. The two magnetic elements are located on the rotation path of the Hall element when the load cuts out of the optical path or cuts into the optical path.

[0014] Alternatively, the position sensor includes two Hall elements and a magnet element, the magnet element being fixed to the rotating shaft and rotating with the rotating shaft, and the two Hall elements being located on the rotation path of the magnet element when the load cuts out of the optical path or cuts into the optical path.

[0015] Furthermore, it also includes a flexible connection mechanism; the flexible connection mechanism includes a first connection terminal, a second connection terminal and a third connection terminal connected sequentially from bottom to top along the axial direction;

[0016] The first connecting terminal is provided with a semi-circular hole that is adapted to the output shaft of the drive motor;

[0017] The third connecting terminal has a pivot pin hole on its circumferential sidewall; the third connecting terminal is connected to the lower end of the pivot through the pivot pin and the pivot pin hole.

[0018] Spring sheets are respectively provided between the first connecting terminal and the second connecting terminal, and between the second connecting terminal and the third connecting terminal. The end faces of the first connecting terminal and the third connecting terminal near the second connecting terminal are respectively provided with boss holes for installing the spring sheets. The boss holes are used to ensure that the spring sheets have a certain deformation space after installation.

[0019] Furthermore, the base includes a first protrusion at the upper end of the base, and a second and a third protrusion at the lower end;

[0020] The emergency reset mechanism is located at the upper end of the first protruding seat;

[0021] The upper end of the rotating shaft passes through the first protruding seat and connects to the emergency reset mechanism, while the lower end passes through the second protruding seat and connects to the third connecting terminal.

[0022] The magnetic steel element and the Hall element are located at the lower end of the rotating shaft and between the second protrusion and the third protrusion.

[0023] The drive motor is located at the lower end of the third protrusion, and its output end passes through the third protrusion and is connected to the first connection terminal.

[0024] Furthermore, the emergency reset mechanism includes a spring box, a spring shaft coaxially rotatably disposed within the spring box, a reset plate connected to the upper end of the spring shaft, an emergency lever connected to the lower end of the spring shaft, a planar spring located between the spring shaft and the spring box, an upper cover plate located between the reset plate and the upper end of the spring box, a locking nut for fixing the reset plate, as well as bearings and a swing rod;

[0025] The pin puller is located on the outer wall of the spring box;

[0026] The upper end of the coil spring shaft passes through the upper cover plate, the reset plate, and the lock nut in sequence;

[0027] The reset plate has multiple pin holes evenly distributed around its circumference that mate with the pins of the pin puller.

[0028] The inner interface of the flat coil spring is connected to the coil spring shaft, and the outer interface is snapped into the coil spring box. The flat coil spring is used to drive the emergency lever to rotate during emergency reset.

[0029] The rotating shaft is connected to the first protrusion seat by a bearing, and the upper end of the rotating shaft passes through the first protrusion seat and is fixed to the swing rod;

[0030] The emergency lever works in conjunction with the swing lever to push the swing lever during emergency reset, thereby causing the rotating shaft to rotate and the load to cut out of the optical path.

[0031] Furthermore, it also includes a limiting and fixing mechanism disposed at the lower end of the first protrusion seat and a limiting and rotating mechanism disposed on the rotating shaft near the lower end of the first protrusion seat;

[0032] The limiting and fixing mechanism includes an arc-shaped body, a cutting-out limiting surface and a cutting-in limiting surface respectively disposed at both ends of the lower end face of the arc-shaped body, and a first steady-state trap and a second steady-state trap disposed between the cutting-out limiting surface and the cutting-in limiting surface;

[0033] The limiting rotation mechanism includes a limiting rotation rod, a limiting ball, a limiting spring, and a locking screw;

[0034] One end of the limiting rotating rod is fixedly connected to the rotating shaft, and the other end is used to swing between the cutting-out limiting surface and the cutting-in limiting surface when the rotating shaft rotates;

[0035] The other end of the limiting rotating rod is provided with an axial mounting hole, and the limiting ball, limiting spring, and locking screw are arranged in the mounting hole from top to bottom; the limiting ball cooperates with the first steady-state trap to limit the load when it cuts out of the optical path; or, the limiting ball cooperates with the second steady-state trap to limit the load when it cuts into the optical path.

[0036] The locking screw adjusts the preload of the limiting ball by adjusting the compression of the limiting spring.

[0037] Furthermore, it also includes a locking pin puller, a locking pin hole component, and a bracket;

[0038] The locking pin is mounted on the base and has a locking pin on it. The locking pin is used for electrical connection with external equipment.

[0039] The load is fixed to the side wall of the rotating shaft via a bracket;

[0040] The locking pin hole is set on the bracket and corresponds to the position of the locking pin puller. The end of the locking pin hole is provided with a tapered hole, which cooperates with the pin of the locking pin puller to lock the rotating shaft when the load cuts out the optical path.

[0041] Furthermore, the magnetic steel element includes a magnetic steel base, a magnetic steel protective shell, and a magnetic steel disposed inside the magnetic steel protective shell;

[0042] Hall elements include Hall cover plates, Hall mounts, Hall brackets, and Hall chip circuits;

[0043] One end of each of the two magnet bases is fixedly connected to the base; one end of the Hall bracket is fixedly connected to the rotating shaft; or one end of the magnet base is fixedly connected to the rotating shaft; one end of each of the two Hall brackets is fixedly connected to the base.

[0044] A protective shell for the magnet is located at the other end of the magnet base, and the protective shell for the magnet is provided with a magnet limiting hole;

[0045] The Hall cover and Hall seat are located at the other end of the Hall bracket, and the Hall chip circuit is located between the Hall cover and the Hall seat to form a magnetic induction current signal with the magnet.

[0046] The Hall cover plate is provided with a wire outlet groove and a Hall sensing hole respectively; the wire outlet groove is used to lead out the connection wire of the Hall chip in the Hall chip circuit and connect it to the external device; the Hall sensing hole is used to correspond to the magnetic limit hole of the magnet and mark the theoretical sensing position of the Hall chip.

[0047] Furthermore, the load includes a radiating plate, titanium screws, a back plate, a heat-insulating T-sleeve, and a heat-insulating pad;

[0048] The radiating plate is mounted on the side wall of the support near the radiating cooling shroud mechanism by titanium screws when the load cuts out the optical path. The back plate is mounted on the other side wall of the support. A thermal control multilayer is provided between the back plate and the support, and between the radiating plate and the support.

[0049] A heat-insulating T-sleeve is fitted between the radiant plate and the titanium screw;

[0050] A heat insulation pad is installed between the radiant panel and the support frame.

[0051] Furthermore, the radiation cooling shroud mechanism includes a radiation cooling shroud housing, a collision fixing block, a collision nut, a collision rubber, a heat pipe, a heat pipe clamp, a flexible pad, and a screw anti-loosening baffle;

[0052] The radiant cooling shroud is fixed to the base, and the dimensions of the radiant cooling shroud are adapted to the back plate.

[0053] The collision fixing block is set on the inner wall of the radiating cooling cover housing near the radiating plate when the load cuts out the optical path by means of a collision nut;

[0054] The impact rubber is set on the impact fixing block and corresponds to the position of the titanium screw. It is used to reduce the emergency impact force by directly contacting the titanium screw when the load cuts out the optical path.

[0055] The heat pipes are mounted on the outer wall of the radiant cooling shroud via heat pipe clamps. The heat pipes are used to connect with the on-board cooling plates to ensure a low-temperature environment.

[0056] The heat pipe clamp is connected to the radiant cooling shroud housing by screws, and a flexible pad is placed at the connection between the heat pipe clamp and the radiant cooling shroud housing.

[0057] The screw anti-loosening baffle is bonded to the outer wall of the heat pipe clamp and is located on the outside of the screw.

[0058] Furthermore, the device also includes a heat-insulating trimming pad and a locking pin trimming pad;

[0059] The pin puller is mounted on the outer wall of the spring box via a heat-insulating trimming pad;

[0060] The locking pin puller is mounted on the base via a locking pin puller trimming pad;

[0061] The limiting and fixing mechanism also includes multiple glue injection grooves disposed between the first steady-state trap and the second steady-state trap to assist in fixing the arc-shaped body;

[0062] The drive motor is a stepper motor with backup windings;

[0063] The radiant panel uses a blackbody, with black paint applied to the inside and heating elements attached to the outside.

[0064] The beneficial effects of this invention are:

[0065] (1) The present invention provides a direct-drive bistable cut-in or cut-out type off-center load calibration device. Due to the use of a drive method that combines a rotating shaft with an emergency reset mechanism and a drive motor, the transmission complexity is reduced. In the cut-out and cut-in states, the load position will not be out of control or deviate from the original state due to impacts such as on-orbit micro-vibration or the action of moving parts on the satellite.

[0066] (2) The present invention provides a direct-drive bistable cut-in or cut-out type off-center load calibration device, which can simultaneously meet the requirements of on-orbit emergency response, bistable position, reduced volume and weight, and adaptability to large temperature differences for on-orbit calibration.

[0067] (3) The present invention provides a direct-drive bistable cut-in or cut-out type off-center load calibration device. The load and the support are both located on one side of the rotating shaft. The other side is not balanced by additional weight to ensure that the center of gravity of the load is on the central axis of the rotating shaft. Therefore, the load is an off-center load structure and is not balanced. Since balancing requires additional structural design, in addition to increasing the volume, it also increases the balancing weight. However, the load of the present invention is not balanced and does not require counterweight. The locking pin is used to lock the load to resist the mechanical environment of the active phase of satellite launch, which can reduce the volume and weight of the optical payload system and facilitate the compact design of the optical payload system.

[0068] (4) The present invention provides a direct-drive bistable cut-in or cut-out type off-center load calibration device. The load is suitable for a large temperature difference environment from 360K to 210K through heat insulation measures (i.e., titanium screws, heat insulation T-sleeves, heat insulation pads, locking pin trimming pads, heat insulation trimming pads, and thermal control multilayers).

[0069] (5) The present invention provides a direct-drive bistable cut-in or cut-out type off-center load calibration device, which uses a stepper motor with a backup winding for direct drive, Hall sensor positioning, and no transmission link, thereby reducing the complexity of the device and increasing on-orbit reliability. Attached Figure Description

[0070] Figure 1 This is a schematic diagram of the base and radiation cooling shroud mechanism in an embodiment of the present invention (load not shown);

[0071] Figure 2 This is a schematic diagram of the load-cutting optical path in an embodiment of the present invention;

[0072] Figure 3 A schematic diagram of the load-cutting optical path in an embodiment of the present invention;

[0073] Figure 4 This is a partial cross-sectional view of the load in an embodiment of the present invention;

[0074] Figure 5 This is a partial cross-sectional view of the inner wall of the radiant cooling shroud mechanism in an embodiment of the present invention;

[0075] Figure 6This is a partial cross-sectional view of the outer wall of the radiant cooling shroud mechanism in an embodiment of the present invention;

[0076] Figure 7 This is a schematic diagram of the emergency reset mechanism in an embodiment of the present invention;

[0077] Figure 8 This is a schematic diagram of the installation structure of the planar coil spring, coil spring shaft, emergency lever, swing rod, and shaft in the emergency reset mechanism of this invention.

[0078] Figure 9 This is a schematic diagram of the flexible connection mechanism in an embodiment of the present invention;

[0079] Figure 10 This is a schematic diagram of the structure of the third connecting terminal in an embodiment of the present invention;

[0080] Figure 11 This is a schematic diagram of the locking state of the locking pin when the load cuts out of the optical path in an embodiment of the present invention;

[0081] Figure 12 yes Figure 1 Schematic diagram of the structure in the P direction;

[0082] Figure 13 This is a schematic diagram of the limiting and fixing mechanism in an embodiment of the present invention;

[0083] Figure 14 This is a schematic diagram of the limiting rotation mechanism in an embodiment of the present invention;

[0084] Figure 15 This is a schematic diagram of the structure of the magnetic steel element in an embodiment of the present invention;

[0085] Figure 16 This is a schematic diagram of the Hall element in an embodiment of the present invention;

[0086] Figure 17 This is a cross-sectional view of the Hall element in an embodiment of the present invention;

[0087] Figure 18 This is a schematic diagram of the microconical structure on the radiant cooling shroud housing in an embodiment of the present invention;

[0088] Figure 19 This is a schematic diagram of the installation structure of the two Hall elements and the magnet element in Embodiment 2 of the present invention.

[0089] Explanation of reference numerals in the attached figures:

[0090] 1. Base; 11. Emergency reset mechanism; 101. Spring box; 102. Spring shaft; 103. Reset plate; 104. Emergency lever; 105. Flat spring; 106. Top cover plate; 107. Locking nut; 108. Bearing; 109. Swing rod; 12. Drive motor; 13. Pin puller; 132. Heat insulation trimming pad; 14. First protrusion seat; 15. Second protrusion seat; 16. Third protrusion seat; 17. Locking pin puller; 171. Locking pin puller pin; 172. Locking pin puller trimming pad; 18. Locking pin hole; 181. Tapered hole; 19. Bracket; 2. Load; 21. Radiant plate; 22. Titanium screw; 23. Back plate; 24. Thermal insulation T-sleeve; 25. Thermal insulation pad; 3. Radiation cooling hood mechanism; 31. Radiation cooling hood housing; 32. Impact fixing block; 33. Impact nut; 34. Impact rubber; 35. Heat pipe; 36. Heat pipe clamp; 37. Flexible pad; 3 8. Screw anti-loosening baffle; 4. Rotating shaft; 5. Magnet element; 51. Magnet base; 52. Magnet protective shell; 53. Magnet limiting hole; 54. Magnet; 6. Hall element; 61. Hall cover plate; 611. Cable outlet groove; 612. Hall sensing hole; 62. Hall base; 63. Hall bracket; 64. Hall chip circuit; 7. Flexible connection mechanism; 71. First connection terminal; 711. Semi-circular hole; 72. Second connection terminal; 73. ... Three connecting terminals; 731, pivot pin hole; 74, spring sheet; 75, boss hole; 8, limiting and fixing mechanism; 81, arc-shaped body; 82, cut-out limiting surface; 83, cut-in limiting surface; 84, first steady-state trap; 85, second steady-state trap; 86, glue injection groove; 9, limiting rotation mechanism; 91, limiting rotation rod; 92, limiting ball; 93, limiting spring; 94, locking screw; 10, electrical connector assembly; 100, cable clamp. Detailed Implementation

[0091] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0092] like Figure 1 , Figure 2 , Figure 3 As shown, a direct-drive bistable cut-in or cut-out type off-center load calibration device includes a base 1, a load 2, a radiant cooling shroud mechanism 3, a rotating shaft 4, two identical magnetic steel elements 5, a Hall element 6, a flexible connection mechanism 7, a limiting and fixing mechanism 8, a limiting and rotating mechanism 9, a pin puller 13, a locking pin puller 17, a locking pin hole 18, a bracket 19, a heat insulation trimming pad 132, and a locking pin puller trimming pad 172.

[0093] An emergency reset mechanism 11 is provided at the upper end of the base 1, and a drive motor 12 is provided at the lower end of the base 1. The drive motor 12 is directly driven by a stepper motor with a winding backup, and drives the load 2 to enter or exit the optical path through the flexible connection mechanism 7 to swing. An electrical connector assembly 10 is provided on one side wall of the base 1. The base 1 is composed of a first protrusion 14 at the upper end of the base 1, a second protrusion 15 and a third protrusion 16 at the lower end. The emergency reset mechanism 11 is provided at the upper end of the first protrusion 14. The upper end of the rotating shaft 4 passes through the first protrusion 14 and is connected to the emergency reset mechanism 11, and the lower end passes through the second protrusion 15 and is connected to the third connection terminal 73. The magnet element 5 and the Hall element 6 are provided at the lower end of the rotating shaft 4 and are located between the second protrusion 15 and the third protrusion 16. The drive motor 12 is provided at the lower end of the third protrusion 16, and its output end passes through the third protrusion 16 and is connected to the first connection terminal 71.

[0094] Load 2 is fixed to the side wall of the rotating shaft 4 to block the optical path during on-orbit calibration; the radiant cooling shroud mechanism 3 is fixed to the other side wall of the base 1, and the radiant cooling shroud mechanism 3 cooperates with the load 2 to house the load 2 when the optical path is cut out, and to provide radiant cooling to the load 2 when it is cut out; the pin puller 13 is mounted on the emergency reset mechanism 11 via the heat insulation trimming pad 132; the pin puller 13 is provided with a pin puller pin; the pin puller 13 is electrically connected to external equipment via the electrical connector assembly 10, and is used to retract the pin puller pin in the event of a control circuit failure; the lower end of the rotating shaft 4 is connected to the output shaft of the drive motor 12. The rotating shaft 4 is used to drive the load 2 to cut out of or into the optical path; the upper end of the rotating shaft 4 cooperates with the emergency reset mechanism 11, which, in the event of a control circuit failure, allows the emergency reset mechanism 11 to drive the rotating shaft 4 to cut the load 2 out of the optical path to prevent the load 2 from blocking the optical path; the magnetic steel element 5 is disposed on the base 1 and is located on the rotation path of the Hall element 6 when the load 2 cuts out of or into the optical path; the magnetic steel element 5 is used to cooperate with the Hall element 6; the Hall element 6 is fixedly connected to the lower end of the rotating shaft 4, and is used to electrically connect to external equipment through the electrical connector assembly 10 to indicate the position of the load 2 cutting out of or into the optical path. Figure 4 As shown, the load 2 consists of a radiant plate 21, titanium screws 22, a back plate 23, a heat-insulating T-sleeve 24, and a heat-insulating pad 25. The radiant plate 21 is mounted on the side wall of the bracket 19 near the radiant cooling shroud mechanism 3 via titanium screws 22. The back plate 23 is mounted on the outer side wall of the bracket 19 to prevent the thermal control multilayer from snagging (the thermal control multilayer is located between the back plate 23 and the bracket 19, and between the bracket 19 and the radiant plate 21). Its surface is treated with a high-emissivity black finish to absorb stray light, preventing stray light reflection when the thermal control multilayer is exposed and adapting to large temperature differences. The thermal control multilayer is used to reduce heat leakage, reduce the temperature of the radiant plate 21 from being affected by the environment, and ensure the temperature uniformity of the radiant plate 21.

[0095] A heat-insulating T-sleeve 24 is fitted between the radiating plate 21 and the titanium screw 22; a heat-insulating pad 25 is provided between the radiating plate 21 and the bracket 19. The load 2 is a functional component that performs a certain function, with two positions: cutting out the optical path and cutting into the optical path. In this embodiment, the load 2 is an off-center load structure and is not balanced, which reduces the volume and weight of the device of the present invention. The radiating plate 21 is a blackbody, with black paint applied to the inside and a heating element attached to the outside. It is heat-insulated and installed on the bracket 19 by the heat-insulating T-sleeve 24, the heat-insulating pad 25, and the titanium screw 22, ensuring heat insulation. There are four titanium screws 22 in total, with silicone rubber applied to the heads. In an emergency, the heads of the titanium screws 22 directly contact the impact rubber 34, reducing the impact force.

[0096] like Figure 5 , Figure 6 As shown, the radiation cooling shroud mechanism 3 consists of a radiation cooling shroud housing 31, a collision fixing block 32, a collision nut 33, a collision rubber 34, a heat pipe 35, a heat pipe clamp 36, a flexible pad 37, and a screw anti-loosening baffle 38. The radiation cooling shroud housing 31 is sized to match the back plate 23. The collision fixing block 32 is mounted on the inner wall of the radiation cooling shroud housing 31 near the radiation plate 21 via the collision nut 33. The collision rubber 34 is located inside the collision fixing block 32 and is used to directly contact the titanium screw 22 when the load 2 cuts out the optical path to reduce the emergency impact force. The heat pipe 35 is mounted on the outer wall of the radiation cooling shroud housing 31 via the heat pipe clamp 36 and the screw. The flexible pad 37 is located between the heat pipe clamp 36 and the other side wall of the radiation cooling shroud housing 31. The screw anti-loosening baffle 38 is bonded to the outer wall of the heat pipe clamp 36. The radiant cooling shroud mechanism 3 provides a low temperature environment of less than or equal to 20°C (293K) to the radiant plate 21 in the load 2 through radiant heat transfer, and it can also provide a high temperature environment of greater than 20°C (293K) through the heating plate on its back (i.e., between the bracket 19 and the back plate 23).

[0097] Preferably, four impact rubbers 34 are provided on the side wall of the radiant cooling shroud 31 near the radiant plate 21, all of which are fixed by impact fixing blocks 32. The impact fixing blocks 32 are screwed into the radiant cooling shroud 31 by threads and reinforced by impact nuts 33. During emergency release of load 2, the impact rubbers 34 contact the titanium screws 22 to absorb impact energy. The heat pipe 35 is fixed to the other side wall of the radiant cooling shroud 31 by screws and heat pipe clamps 36. The screws are screwed into the radiant cooling shroud 31 by passing through a flat washer, an elastic washer, a flat washer, a heat pipe clamp 36, and a flexible washer in sequence. The screw anti-loosening baffle 38 is glued to the heat pipe clamp 36, which ensures that when disassembling or assembling the heat pipe 35, no other parts need to be removed, i.e., decoupling. Only loosening or tightening the screws is needed to remove or install the heat pipe 35, which is beneficial for operation in confined spaces. The heat pipe 35 is used to connect to the on-board cold plate facing the cryogenic space (200K) to ensure the low-temperature environment.

[0098] like Figure 7 , Figure 8 As shown, the emergency reset mechanism 11 includes a spring box 101, a spring shaft 102 coaxially rotatably disposed within the spring box 101, a reset plate 103 connected to the upper end of the spring shaft 102, an emergency lever 104 connected to the lower end of the spring shaft 102, a flat spring 105 located between the spring shaft 102 and the spring box 101, an upper cover plate 106 located between the reset plate 103 and the upper end of the spring box 101, a locking nut 107 for fixing the reset plate 103, a bearing 108, and a swing rod 109; a pin puller 13 is disposed on the outer wall of the spring box 101; the upper end of the spring shaft 102 passes through the upper cover plate in sequence. 106. The reset plate 103 is connected to the locking nut 107; the reset plate 103 has multiple outer pin holes evenly distributed around its circumference to cooperate with the pin of the puller; the inner interface of the flat coil spring 105 is connected to the coil spring shaft 102, and the outer interface is snapped into the coil spring box 101. The flat coil spring 105 is used to drive the emergency lever 104 to rotate during emergency reset; the shaft 4 is connected to the first protrusion seat 14 through the bearing 108, and the upper end of the shaft 4 passes through the first protrusion seat 14 and is fixedly connected to the swing rod 109; the emergency lever 104 cooperates with the swing rod 109 and is used to push the swing rod 109 to drive the shaft 4 to rotate during emergency reset, so that the load 2 cuts out the optical path.

[0099] The emergency reset mechanism 11 is used to cut the load 2 out of the optical path via the planar coil spring 105 in the event of failures such as control circuit or cable breakage, thus preventing the main optical path from being blocked. The emergency reset mechanism 11 is not physically connected to the rotating shaft 4 of the load 2, achieving decoupling in its design and improving on-orbit reliability. The outer diameter of the planar coil spring 105 in its free state is larger than the outer diameter of the coil spring box 101. When the planar coil spring 105 is retracted into the coil spring box 101, it already possesses a certain amount of stored torque at its installation position. In this embodiment, the outer diameter of the planar coil spring 105 in its free state is 85mm, and its outer diameter in its retracted state is 60mm.

[0100] like Figure 9 , Figure 10As shown, the flexible connection mechanism 7 includes a first connection terminal 71, a second connection terminal 72, and a third connection terminal 73 connected sequentially from bottom to top along the axial direction. The first connection terminal 71 is provided with a semi-circular hole 711 adapted to the output shaft of the drive motor 12, which is used to connect with the output shaft of the drive motor 12 and restrict the radial free rotation of the drive motor 12. The third connection terminal 73 is provided with a pivot pin hole 731 on its circumferential side wall. The third connection terminal 73 is connected to the lower end of the pivot shaft 4 through a pivot pin and the pivot pin hole 731. Spring sheets 74 are respectively provided between the first connection terminal 71 and the second connection terminal 72, and between the second connection terminal 72 and the third connection terminal 73. The end faces of the first connection terminal 71 and the third connection terminal 73 near the second connection terminal 72 are respectively provided with boss holes 75, which are used to ensure that the spring sheets 74 have a certain deformation space after installation.

[0101] like Figure 11 As shown, along the isometric view of the direct-drive bistable cut-in or cut-out type off-center load calibration device, it can be seen that the locking pin 17 at the cut-out position of the load 2 is set on the base 1 through the locking pin trimming pad 172, and a locking pin pin 171 is set on it. The locking pin 17 is used to electrically connect to external equipment through the electrical connector assembly 10; the load 2 is fixed to the side wall of the rotating shaft 4 through the bracket 19; the locking pin hole 18 cooperates with the locking pin 17 and is set on the bracket 19. Its end is provided with a tapered hole 181, which is adapted to the locking pin pin 171 to ensure that the locking pin pin 171 can smoothly extend and retract in the locking pin 17.

[0102] like Figure 12 As shown, along the isometric (i.e., P-direction) of the direct-drive bistable cut-in or cut-out type off-center load calibration device, the installation positions of the limiting rotation mechanism 9 and the rotating shaft 4, and the limiting fixing mechanism 8 and the base 1 at the load 2 cut-out position can be seen. Figure 13 As shown, the limiting and fixing mechanism 8 is disposed at the lower end of the first protrusion seat 14, including the arc-shaped body 81, the cutting-out limiting surface 82 and the cutting-in limiting surface 83 respectively disposed at both ends of the lower end face of the arc-shaped body 81, the first stable trap 84 and the second stable trap 85 disposed between the cutting-out limiting surface 82 and the cutting-in limiting surface 83, and the three glue injection grooves 86 disposed between the first stable trap 84 and the second stable trap 85; the glue injection grooves 86 are used to assist in fixing the arc-shaped body 81.

[0103] like Figure 14As shown, the limiting rotation mechanism 9 is located near the lower end of the first protrusion 14 of the rotating shaft 4 and includes a limiting rotation rod 91, a limiting ball 92, a limiting spring 93, and a locking screw 94. One end of the limiting rotation mechanism is fixed to the rotating shaft 4 by a screw, and the other end is used to swing between the cutting-out limiting surface 82 and the cutting-in limiting surface 83 when the rotating shaft 4 rotates. The limiting ball 92, the limiting spring 93, and the locking screw 94 are arranged sequentially from top to bottom in the mounting hole. The limiting ball 92 cooperates with the first stable trap 84. In the cutting-out state, it falls into the first stable trap 84 to limit the load 2 when cutting out the optical path. The limiting ball 92 cooperates with the second stable trap 85. In the cutting-in state, it falls into the second stable trap 85 to limit the load 2 when cutting into the optical path. The limiting spring 93 is a compression spring. The compression of the limiting spring 93 can be adjusted by rotating the axial position of the locking screw 94, thereby adjusting the preload of the limiting ball 92.

[0104] The limiting and fixing mechanism 8 is an integrated design, made of tin bronze plated with solid lubricant. The first steady-state trap 84 corresponds to the load 2 cut-out position (i.e., 0-degree position), and the second steady-state trap 85 corresponds to the load 2 cut-in position (i.e., 95-degree position). Preferably, both the first steady-state trap 84 and the second steady-state trap 85 are conical hemispherical holes, with a diameter consistent with the nominal diameter of the limiting ball 92, both being 4mm, and the fit clearance is positive tolerance. The cut-out limiting surface 82 and the cut-in limiting surface 83 are the two extreme positions of the direct-drive bistable cut-in or cut-out type off-center load calibration device of the present invention, which are 1.5° away from the working position (i.e., the included angles between the limiting rotating rod 91 and the cut-out limiting surface 82 and the cut-in limiting surface 83 are both 1.5°).

[0105] like Figure 15 As shown, the magnetic element 5 consists of a magnetic base 51, a magnetic protective shell 52, and a magnet 54 inside the magnetic protective shell 52. One end of the magnetic base 51 is fixedly connected to the base 1. The magnetic protective shell 52 is disposed at the other end of the magnetic base 51, and a magnetic limiting hole 53 is provided on the magnetic protective shell 52. The magnetic protective shell 52 is made of metal material, preferably aluminum alloy. The magnetic limiting hole 53 in the magnetic protective shell 52 can improve the accuracy of Hall sensing. The magnetic elements 5 are divided into two groups, one group is set at the 0-degree position after the load 2 is inserted, and the other group is set at the 95-degree position after the load 2 is removed, which are used to determine the position status of the radiation plate 21 respectively. The two magnetic elements 5 cooperate with one Hall element 6 to realize the accurate transmission of the load position.

[0106] like Figure 16 , Figure 17As shown, the Hall element 6 consists of a Hall cover plate 61, a Hall seat 62, a Hall bracket 63, and a Hall chip circuit 64. One end of the Hall bracket 63 is fixedly connected to the rotating shaft 4 near the lower side wall of the second protrusion 15, and the Hall cover plate 61 and the Hall seat 62 are disposed at the other end of the Hall bracket 63. The Hall chip circuit 64 is disposed between the Hall cover plate 61 and the Hall seat 62, and is used to form a magnetic induction current signal with the magnet 54. The Hall cover plate 61 is provided with a wire outlet groove 611 and a Hall sensing hole 612. The wire outlet groove 611 is used to lead out the connection wire of the Hall chip in the Hall chip circuit 64 and connect it to an external device through the electrical connector assembly 10, and is fixed to the base 1 with a cable clamp 100. The Hall sensing hole 612 corresponds to the magnetic limiting hole 53 of the magnet and marks the theoretical sensing position of the Hall chip. In this embodiment, the materials of the Hall cover 1 and the Hall seat 62 are both heat-insulating polyimide, which is used to avoid changes in the accuracy of the Hall chip circuit 64 due to temperature changes.

[0107] like Figure 19 As shown, in other embodiments, one end of the magnet base 51 is fixedly connected to the rotating shaft 4; one end of each of the two Hall brackets 63 is fixedly connected to the base 1.

[0108] When load 2 is disconnected from the optical path, locking pin 17 is in a locked state. The highest temperature of the radiant plate 21 is 360K, and the lowest temperature is 210K; the temperature of the cooling shroud housing 31 is 205K. For example... Figure 18 As shown, the working surfaces of the cooling shroud shell 31 and the radiation plate 21 are respectively provided with micro-conical structures and coated with a high emissivity coating, which can greatly improve the on-orbit radiation capability. At this time, the radiation plate 21 and the cooling shroud shell 31 face each other, and the low temperature of 205K of the cooling shroud shell 31 can be transferred to the radiation plate 21 through radiation heat exchange, so that their temperatures tend to be uniform (considering the 5K temperature difference under the condition of heat leakage).

[0109] To prevent damage from collisions during satellite launch, the load 2 is reliably secured during launch by engaging the locking pin hole 18 with the locking pin puller 17, preventing uncontrolled random rotation of the load 2. The locking pin puller 17 is connected to the base 1 by screws via a locking pin puller trimming pad 172. The locking pin puller trimming pad 172 is made of fiberglass, which not only allows for adjustment of the locking pin puller 17's position, avoiding excessive assembly stress, but also provides thermal insulation to prevent the locking pin puller 17 from overheating and triggering erroneously.

[0110] When load 2 enters the optical path, radiation plate 21 enters the main optical path, the position of magnet element 5 aligns with the Hall element 6 on the entering side, and outputs position signal A to external equipment. At this time, the limit ball 92 in the limit rotation mechanism 9 falls into the second steady-state trap 85.

[0111] When load 2 cuts out of the optical path, radiation plate 21 cuts out of the main optical path, the position of magnet element 5 aligns with the Hall element 6 on the cut-out side, and outputs position signal B to external equipment. At this time, the limit ball 92 in the limit rotation mechanism 9 falls into the first steady-state trap 84.

[0112] In other embodiments, the radiating plate 21 can be a blackbody, a graybody, a diffuse reflector, or a plane reflector; the drive motor 12 can also be a torque motor with more complex control; the Hall element 6 can be based on the Hall sensing principle, or it can be based on the photoelectric switch principle or the micro switch principle.

[0113] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A direct drive bi-stable cut-in or cut-out type biasing calibration device, characterized by: The device comprises a base (1), an emergency reset mechanism (11), a driving motor (12), a rotating shaft (4), a load (2) for blocking light path during on-orbit calibration, a radiation shield mechanism (3), a pin puller (13) and a position sensor. The emergency reset mechanism (11) is located at the upper end of the base (1). The driving motor (12) is located at the lower end of the base (1). The upper end of the rotating shaft (4) is matched with the emergency reset mechanism (11), and the lower end is connected with the driving motor (12). One side of the load (2) is fixedly connected with the middle part of the rotating shaft (4) and can rotate with the rotating shaft (4). The radiation shield mechanism (3) is fixedly connected with the base (1) and is used for accommodating the load (2) after cutting off the light path and radiating the load (2) in the cut-off state. The pin puller (13) is arranged on the emergency reset mechanism (11) and is used for opening the emergency reset mechanism (11) in the case of control circuit failure. The position sensor comprises a Hall element (6) and two magnetic steel elements (5). The Hall element (6) is fixedly connected with the rotating shaft (4) and rotates with the rotating shaft (4). The two magnetic steel elements (5) are located on the rotation path of the Hall element (6) when the load (2) is cut off or cut in the light path. Alternatively, the position sensor comprises two Hall elements (6) and a magnetic steel element (5). The magnetic steel element (5) is fixedly connected with the rotating shaft (4) and rotates with the rotating shaft (4). The two Hall elements (6) are located on the rotation path of the magnetic steel element (5) when the load (2) is cut off or cut in the light path.

2. The direct-drive double-stable cut-in or cut-off type partial load calibration device according to claim 1, further comprising a flexible connection mechanism (7), wherein the flexible connection mechanism (7) comprises a first connection terminal (71), a second connection terminal (72) and a third connection terminal (73) connected in sequence from bottom to top along the axial direction. A semicircular hole (711) matched with the output shaft of the driving motor (12) is arranged on the first connection terminal (71). A rotating shaft pin hole (731) is arranged on the circumferential sidewall of the third connection terminal (73). The third connection terminal (73) is connected with the lower end of the rotating shaft (4) through the rotating shaft pin and the rotating shaft pin hole (731). Spring sheets (74) are arranged between the first connection terminal (71) and the second connection terminal (72) and between the second connection terminal (72) and the third connection terminal (73), respectively. Boss holes (75) for mounting the spring sheets (74) are arranged on the end faces of the first connection terminal (71) and the third connection terminal (73) close to the second connection terminal (72), respectively. The boss holes (75) are used to ensure that the spring sheets (74) have a certain deformation space after installation.

3. The direct-drive double-stable cut-in or cut-off type partial load calibration device according to claim 2, wherein the base (1) comprises a first protruding seat (14) located at the upper end of the base (1), a second protruding seat (15) and a third protruding seat (16) located at the lower end of the base (1). The emergency reset mechanism (11) is arranged at the upper end of the first protruding seat (14). ​ ​ The upper end of the rotating shaft (4) penetrates the first protruding seat (14) and is connected with the emergency reset mechanism (11), and the lower end penetrates the second protruding seat (15) and is connected with the third connecting terminal (73); The magnetic steel element (5) and the Hall element (6) are arranged at the lower end of the rotating shaft (4) and between the second protruding seat (15) and the third protruding seat (16); The driving motor (12) is arranged at the lower end of the third protruding seat (16), and the output end penetrates the third protruding seat (16) and is connected with the first connecting terminal (71).

4. The direct-drive double-stable cut-in or cut-out type partial load scaling device according to claim 3, characterized in that: The emergency reset mechanism (11) comprises a coil spring box (101), a coil spring rotating shaft (102) coaxially and rotatably arranged in the coil spring box (101), a reset disc (103) connected to the upper end of the coil spring rotating shaft (102), an emergency lever (104) connected to the lower end of the coil spring rotating shaft (102), a planar coil spring (105) between the coil spring rotating shaft (102) and the coil spring box (101), an upper cover plate (106) between the reset disc (103) and the upper end of the coil spring box (101), a locking nut (107) for fixing the reset disc (103), a bearing (108) and a swing lever (109); The pin puller (13) is arranged on the outer wall of the coil spring box (101); The upper end of the coil spring rotating shaft (102) is connected with the upper cover plate (106), the reset disc (103) and the locking nut (107) in sequence; The reset disc (103) is uniformly distributed with a plurality of outer pin holes matched with the pins of the pin puller (13) along the circumference; The inner interface of the planar coil spring (105) is connected with the coil spring rotating shaft (102), and the outer interface is clamped with the coil spring box (101), and the planar coil spring (105) is used to drive the emergency lever (104) to rotate during emergency reset; The rotating shaft (4) and the first protruding seat (14) are connected through the bearing (108), and the upper end of the rotating shaft (4) penetrates the first protruding seat (14) and is fixedly connected with the swing lever (109); The emergency lever (104) cooperates with the swing lever (109) and is used to push the swing lever (109) to drive the rotating shaft (4) to rotate and make the load (2) cut out of the light path during emergency reset.

5. The direct-drive double-stable cut-in or cut-out type partial load scaling device according to claim 4, characterized in that: It further comprises a limiting fixing mechanism (8) arranged at the lower end of the first protruding seat (14) and a limiting rotating mechanism (9) arranged on the rotating shaft (4) close to the lower end of the first protruding seat (14); The limiting fixing mechanism (8) comprises an arc-shaped body (81), a cut-out limiting surface (82) and a cut-in limiting surface (83) arranged at the lower end surface of the arc-shaped body (81), a first stable trap (84) and a second stable trap (85) arranged between the cut-out limiting surface (82) and the cut-in limiting surface (83); The limiting rotating mechanism (9) comprises a limiting rotating lever (91), a limiting ball (92), a limiting spring (93) and a locking screw (94). One end of the limiting rotating rod (91) is fixedly connected with the rotating shaft (4), and the other end is used for swinging between the limiting surface (82) and the limiting surface (83) when the rotating shaft (4) rotates; The other end of the limiting rotating rod (91) is provided with an axial mounting hole, and the limiting ball (92), the limiting spring (93) and the locking screw (94) are sequentially arranged in the mounting hole from top to bottom; the limiting ball (92) is matched with the first stable trap (84) and is used for limiting when the load (2) cuts out the light path; or the limiting ball (92) is matched with the second stable trap (85) and is used for limiting when the load (2) cuts into the light path; The locking screw (94) adjusts the compression amount of the limiting spring (93) and further adjusts the pre-tightening force of the limiting ball (92).

6. The direct-drive double-stable cut-in or cut-out type partial load scaling device according to claim 5, further comprising a locking pin extractor (17), a locking pin hole component (18) and a support (19). The locking pin extractor (17) is arranged on the base (1) and is provided with a locking pin extractor pin (171), and the locking pin extractor (17) is used for electrically connecting with an external device; The load (2) is fixedly connected with the side wall of the rotating shaft (4) through the support (19); The locking pin hole component (18) is arranged on the support (19) and corresponds to the position of the locking pin extractor (17), and the end of the locking pin hole component (18) is provided with a tapered hole (181), which is matched with the locking pin extractor pin (171) and is used for locking the rotating shaft (4) when the load (2) cuts out the light path.

7. The direct-drive double-stable cut-in or cut-out type partial load scaling device according to claim 6, wherein the magnetic steel element (5) comprises a magnetic steel seat (51), a magnetic steel protection shell (52) and a magnetic steel (54) arranged in the magnetic steel protection shell (52); The Hall element (6) comprises a Hall cover plate (61), a Hall seat (62), a Hall support (63) and a Hall chip circuit (64); One end of each of the two magnetic steel seats (51) is fixedly connected with the base (1), and one end of each of the two Hall supports (63) is fixedly connected with the base (1); or one end of the magnetic steel seat (51) is fixedly connected with the rotating shaft (4), and one end of the Hall support (63) is fixedly connected with the rotating shaft (4); The magnetic steel protection shell (52) is arranged at the other end of the magnetic steel seat (51), and the magnetic steel protection shell (52) is provided with a magnetic steel limiting hole (53); The Hall cover plate (61) and the Hall seat (62) are arranged at the other end of the Hall support (63), and the Hall chip circuit (64) is arranged between the Hall cover plate (61) and the Hall seat (62) and is used for forming a magnetic induction current signal with the magnetic steel (54); The Hall cover plate (61) is provided with a wire outlet groove (611) and a Hall induction hole (612), respectively; the wire outlet groove (611) is used for leading out the connecting wire of the Hall chip in the Hall chip circuit (64) and electrically connecting with an external device; and the Hall induction hole (612) is used for corresponding to the magnetic steel limiting hole (53) and identifying the theoretical induction position of the Hall chip. ​ ​ 8. The direct-drive double-stable cut-in or cut-out type partial load scaling device according to claim 7, wherein: the load (2) comprises a radiation plate (21), a titanium screw (22), a back plate (23), a heat insulation T-shaped sleeve (24) and a heat insulation pad (25); the radiation plate (21) is arranged on the side wall of the support (19) close to the radiation shield mechanism (3) through the titanium screw (22) when the load (2) cuts off the light path, the back plate (23) is arranged on the other side wall of the support (19), and a heat control multilayer is arranged between the back plate (23) and the support (19) and between the radiation plate (21) and the support (19); the heat insulation T-shaped sleeve (24) is sleeved between the radiation plate (21) and the titanium screw (22); and the heat insulation pad (25) is arranged between the radiation plate (21) and the support (19).

9. The direct-drive double-stable cut-in or cut-out type partial load scaling device according to claim 8, wherein: the radiation shield mechanism (3) comprises a radiation shield shell (31), a collision fixed block (32), a collision nut (33), a collision rubber (34), a heat pipe (35), a heat pipe clamp (36), a flexible pad (37) and a screw anti-loose baffle (38); the radiation shield shell (31) is fixed on the base (1), and the radiation shield shell (31) is matched in size with the back plate (23); the collision fixed block (32) is arranged on the inner side wall of the radiation shield shell (31) close to the radiation plate (21) through the collision nut (33) when the load (2) cuts off the light path; the collision rubber (34) is arranged on the collision fixed block (32) and corresponds to the position of the titanium screw (22), and is used for directly contacting the titanium screw (22) to reduce the emergency impact force when the load (2) cuts off the light path; the heat pipe (35) is arranged on the outer side wall of the radiation shield shell (31) through the heat pipe clamp (36), and the heat pipe (35) is used for connecting with a cold plate on a satellite to ensure a low-temperature environment; the heat pipe clamp (36) is connected with the radiation shield shell (31) through a screw, and the flexible pad (37) is arranged at the connection between the heat pipe clamp (36) and the radiation shield shell (31); and the screw anti-loose baffle (38) is bonded to the outer wall of the heat pipe clamp (36) and is located on the outer side of the screw.

10. The direct-drive double-stable cut-in or cut-out type partial load scaling device according to claim 9, wherein: further comprising a heat insulation cutting pad (132) and a locking pin extractor cutting pad (172); the pin extractor (13) is arranged on the outer wall of the coil spring box (101) through the heat insulation cutting pad (132); the locking pin extractor (17) is arranged on the base (1) through the locking pin extractor cutting pad (172); the limiting and fixing mechanism (8) further comprises a plurality of glue injection grooves (86) arranged between the first stable trap (84) and the second stable trap (85), and is used for assisting in fixing the arc-shaped body (81); the driving motor (12) is a step motor with backup winding; and the radiation plate (21) adopts a black body, and the inside of the black body is coated with black paint, and the outside is pasted with a heating sheet. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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