High-reliability calibration mechanism with fault emergency exit capability

Abstract

The invention relates to a calibration mechanism, in particular to a high-reliability calibration mechanism with a fault emergency exit capability, and solves the problem of how to carry out fault emergency exit when the calibration mechanism breaks down in a shading state. The high-reliability calibration mechanism comprises a base arranged on a calibration fixing frame, and a fixing seat is arranged on the base; a rotating shaft of the calibration assembly is rotationally connected with the fixed seat; two ends of the rotating shaft are respectively connected with the motor and the potentiometer; a calibration plate is connected to the outer wall of one side of the rotating shaft, a turnover shaft parallel to the axis of the rotating shaft is arranged on one side of the calibration fixing frame, and the turnover shaft is hinged to the side, close to the turnover shaft, of the base; a torsion spring is sleeved on the turnover shaft, and two ends of the torsion spring are respectively connected with the base and the calibration fixing frame; a locking and releasing assembly is arranged at the bottom of the calibration fixing frame, the notch bolt is used for connecting the base and the calibration fixing frame, the notch bolt, the shape memory alloy pipe and the heater are sequentially arranged in the shell from inside to outside in a sleeved mode, and a notch of the notch bolt is located on the combination face of the base and the calibration fixing frame.

Description

Technical Field

[0001] The invention relates to a calibration mechanism, in particular to a high-reliability calibration mechanism with fault emergency exit capability. Background Art

[0002] Space optical remote sensing cameras are scientific instruments for space earth observation on space platforms. They have obvious advantages such as large field of view, wide coverage, fast movement speed and no airspace restrictions. With the increasing demand for aviation observation equipment, space optical remote sensing cameras are developing rapidly in the field of aerial photography and imaging.

[0003] As a key component for monitoring the changes in the optoelectronic performance of the camera during its operation in space, the calibration mechanism adjusts the amount of light entering the space optical remote sensing camera through the swing angle of the calibration plate, so its performance directly determines the imaging quality of the camera. With the continuous development of space earth observation technology, on the one hand, it is more and more urgent for aviation observation equipment to make further breakthroughs in technical indicators and mission indicators such as observation accuracy, sky coverage, and operating life. However, the traditional calibration mechanism has problems such as poor reliability, complex assembly process, and low production efficiency, which cannot fully meet the growing radiation calibration needs of space optical remote sensing cameras. On the other hand, the calibration mechanism needs to withstand the vibration of the rocket launch during the rocket launch process, and when it reaches the outer space environment, it also needs to adapt to the working environment where the temperature in space changes sharply. When it is working, it also needs a motor to drive the calibration plate to swing back and forth. If the motor suffers varying degrees of damage in a harsh working environment, the calibration mechanism is at great risk of getting stuck, resulting in light blocking, which becomes the main factor affecting the imaging quality of the camera. This requires that when the calibration mechanism fails in the light-shielding state, it has a fault emergency exit function to reduce the impact on the focal plane of the space optical remote sensing camera. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem that when a calibration mechanism fails in a light-shielding state, it is difficult to perform a fault emergency exit, and to provide a highly reliable calibration mechanism with a fault emergency exit capability.

[0005] In order to achieve the above-mentioned invention object, the present invention provides the following technical solutions:

[0006] A high-reliability calibration mechanism with fault emergency exit capability, which is special in that it includes a calibration fixing frame, a base, an execution component, a drive component, a feedback component, a locking and releasing component and a main controller;

[0007] The calibration fixing frame is fixedly mounted on the light inlet of the space optical remote sensing camera, and the base is arranged on the calibration fixing frame;

[0008] The execution component includes a calibration component and a motor; two fixing seats are arranged opposite to each other at two ends of the base, the motor is connected to the base, the calibration component includes a rotating shaft and a calibration plate, the rotating shaft is rotatably connected to the two fixing seats respectively, and one end of the rotating shaft is connected to the output end of the motor; the calibration plate is located between the two fixing seats and connected to the outer wall of one side of the rotating shaft; the control end of the motor is connected to the main controller, and is used to control the rotation angle of the calibration plate to adjust the amount of light entering;

[0009] The driving assembly is used to flip the base when a fault occurs, and includes a flip shaft and a torsion spring. The flip shaft is fixed to one side of the calibration fixing frame, the axis of the flip shaft is parallel to the rotation axis, and the flip shaft is hinged to one side of the base close to the flip shaft; the torsion spring is sleeved on the flip shaft, and the two ends are respectively connected to the base and the calibration fixing frame;

[0010] The feedback component includes a potentiometer arranged on the base, and the other end of the rotating shaft is connected to the input end of the potentiometer; the output end of the potentiometer is connected to the main controller for monitoring the rotation angle of the calibration plate;

[0011] The locking and releasing assembly includes a shell and a heater, a notched bolt, and a shape memory alloy tube arranged in the shell. The shell is connected to the bottom of the calibration fixing frame. The notched bolt, the shape memory alloy tube and the heater are sequentially sleeved in the shell from the inside to the outside. The notched bolt is used to connect the calibration fixing frame and the base, and the notched bolt is provided with a notch, which is located at the joint surface between the base and the calibration fixing frame; the control end of the heater is connected to the main controller, which is used to start the heater to heat the shape memory alloy tube in the event of a fault, so that the notched bolt is disconnected at the notch under the action of the phase change force.

[0012] Furthermore, it also includes a docking locking assembly; the docking locking assembly includes a docking cone rod arranged on the top of one of the fixed seats and a docking cone rod groove arranged on the side wall of the calibration fixing frame on the same side as the flip axis, and the position setting of the docking cone rod groove and the docking cone rod satisfies: when the base is rotated around the flip axis until the bottom surface of the base is in a horizontal state, the docking cone rod is inserted into the docking cone rod groove.

[0013] Furthermore, a motor mounting frame and a potentiometer mounting frame are provided on the base; the motor mounting frame and the potentiometer mounting frame are respectively located outside the two fixing seats;

[0014] The motor is connected to the motor mounting frame, and the output end of the motor is fixedly connected to one end of the rotating shaft through a first coupling;

[0015] The potentiometer is connected to the potentiometer mounting frame, and the input end of the potentiometer is fixedly connected to the other end of the rotating shaft through a second coupling.

[0016] Furthermore, the feedback assembly also includes a proximity switch and a magnetic steel mounting arm for cooperating with the proximity switch;

[0017] The magnetic steel mounting arm is fixedly connected to the outer wall of the rotating shaft between the second coupling and the fixed seat; the proximity switch is arranged on the side of the potentiometer mounting frame close to the fixed seat, and two proximity switches are arranged, and the two proximity switches are respectively arranged on both sides of the second coupling; the position setting of the magnetic steel mounting arm and the proximity switch satisfies: when the calibration plate rotates to the side away from the flip axis and is in a horizontal state, or when the calibration plate rotates to the side close to the flip axis and is in a horizontal state, the magnetic steel mounting arm is respectively sensed by the two proximity switches, and the output ends of the two proximity switches are respectively connected to the main controller.

[0018] Furthermore, the calibration component also includes a counterweight; the section where the rotating shaft is connected to the calibration plate is rectangular in cross section, and the counterweight is connected to the outer wall of the rotating shaft on the other side opposite to the calibration plate by screws.

[0019] Furthermore, blocks are respectively provided on both sides of one of the fixed seats, and a baffle is provided at one end of the calibration plate close to the block. The positions of the block and the baffle are arranged so that: when the calibration plate is rotated to the side away from the flip axis and is in a horizontal state, and when the calibration plate is rotated to the side close to the flip axis and is in a horizontal state, the baffle respectively abuts against the two blocks.

[0020] Furthermore, the torsion spring includes a first torsion spring and a second torsion spring, which are respectively arranged at two ends of the flip shaft.

[0021] Furthermore, a pair of angular contact ball bearings is arranged in one of the fixed seats, and a deep groove ball bearing is arranged in the other fixed seat. Both ends of the rotating shaft are connected to the two fixed seats through the angular contact ball bearings and the deep groove ball bearings respectively.

[0022] Furthermore, the rotating shaft, the docking cone rod and the docking cone rod groove are all made of titanium alloy; the calibration fixing frame, the calibration plate, the motor mounting frame and the potentiometer mounting frame are all made of aluminum alloy; and the counterweight block is made of brass.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention provides a high-reliability calibration mechanism with fault emergency exit capability, comprising a calibration fixing frame, a base, an execution component, a driving component, a feedback component, a locking and releasing component and a main controller. The base is arranged on the calibration fixing frame, and two fixing seats are arranged opposite to each other at both ends of the base. The execution component is responsible for blocking the incoming light, and comprises a rotating shaft rotatably connected to the two fixing seats, a calibration plate is connected to the outer wall of one side of the rotating shaft, a motor is connected to one end of the rotating shaft, and a control end of the motor is connected to the main controller for controlling the rotation angle of the calibration plate to adjust the amount of incoming light; the feedback component is responsible for real-time monitoring of the position state of the calibration plate, and comprises a potentiometer connected to the other end of the rotating shaft; and the driving component cooperates with the locking and releasing component to realize For the emergency exit when a failure occurs in the shading state, the driving component includes a flip shaft fixed on one side of the calibration fixture and parallel to the axis of the rotating shaft. A torsion spring is sleeved on the flip shaft, and the two ends of the torsion spring are respectively connected to the base and the calibration fixture; and the locking and releasing component is responsible for connecting the base and the calibration fixture when there is no fault. When a fault occurs, the main controller detects that the motor is stuck and immediately starts the heater to heat the shape memory alloy tube to about 80°C, causing the shape memory alloy tube to deform. Under the action of the phase change force of the shape memory alloy tube, the notch bolt will be disconnected at its notch, causing the base to lose connection with the calibration fixture. At this time, under the action of the torsion spring, the entire base will rotate around the flip shaft, so that the calibration plate no longer blocks the light input of the space optical remote sensing camera.

[0025] (2) The high-reliability calibration mechanism with fault emergency exit capability provided by the present invention is also provided with a docking locking assembly, which includes a docking cone rod and a docking cone rod groove. When a fault occurs and causes emergency exit, the base will rotate around the flip axis. When the base rotates around the flip axis until the bottom surface of the base is in a horizontal state, the docking cone rod is inserted into the docking cone rod groove to lock the position of the base.

[0026] (3) A high-reliability calibration mechanism with fault emergency exit capability provided by the present invention is also provided with a proximity switch and a magnetic steel mounting arm cooperating with the proximity switch, and the position setting of the magnetic steel mounting arm and the proximity switch satisfies: when the calibration plate is rotated to the side away from the flip axis and is in a horizontal state, or when the calibration plate is rotated to the side close to the flip axis and is in a horizontal state, the magnetic steel mounting arm is sensed by the two proximity switches respectively, and these two states are the light-transmitting state and the light-shielding state. The switch signal of the proximity switch is used to determine whether the calibration plate is in the corresponding light-transmitting state or the light-shielding state. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a high-reliability calibration mechanism with a fault emergency exit capability in a light-shielding state according to the present invention;

[0028] Figure 2 for Figure 1Top view (rotated 180° clockwise);

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention in a light-transmitting state;

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention in a fault exit state;

[0031] Figure 5 for Figure 4 A top view of

[0032] Figure 6 is a schematic diagram of the three-dimensional structure of a calibration component in an embodiment of the present invention;

[0033] Figure 7 is a schematic diagram of the three-dimensional structure of the base in an embodiment of the present invention;

[0034] Figure 8 It is a schematic diagram of the three-dimensional structure of the locking and releasing assembly in an embodiment of the present invention;

[0035] Fig. 9 Schematic diagram of the connection between the notched bolt, the base and the calibration fixing frame in an embodiment of the present invention (the housing is not shown).

[0036] The following are the descriptions of the reference numerals:

[0037] 1-calibration fixing frame, 2-motor, 3-motor mounting frame, 4-first coupling, 5-base, 51-fixed seat; 6-first torsion spring, 7-calibration assembly, 71-rotating shaft, 72-counterweight, 73-calibration plate, 74-baffle; 8-second torsion spring, 9-jointing cone rod, 91-jointing cone rod groove; 10-proximity switch, 11-potentiometer, 12-magnetic steel mounting arm, 13-potentiometer mounting frame, 14-locking release assembly, 141-housing, 142-heater, 143-shape memory alloy tube, 144-notched bolt; 18-block, 19-flip shaft, 20-second coupling. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0039] Reference Figure 1-Figure 9 The high-reliability calibration mechanism with fault emergency exit capability of the present invention comprises a calibration fixture 1, a base 5, an execution component, a drive component, a feedback component, a locking release component, a docking locking component and a main controller, wherein the calibration fixture 1 is fixedly mounted on the light inlet of the space optical remote sensing camera, and the base 5 is arranged on the calibration fixture 1. In order to reduce the deadweight of the entire mechanism, the calibration fixture 1 is made of aluminum alloy. The structure of the base 5 is as follows Figure 7As shown, two fixing seats 51 are arranged opposite to each other at two ends, and a motor mounting frame 3 and a potentiometer mounting frame 13 are arranged on the base 5 and outside the two fixing seats 51, respectively. In order to reduce the dead weight, both are made of aluminum alloy.

[0040] The execution component includes a calibration component 7 and a motor 2. The motor 2 is connected to the motor mounting frame 3, and the control end of the motor 2 is connected to the main controller. The calibration component 7 has a structure as shown in FIG. Figure 6 As shown, it includes a rotating shaft 71, a counterweight 72, a calibration plate 73 and a baffle 74. In this embodiment, a pair of angular contact ball bearings are provided in the fixed seat 51 close to the motor 2, and a deep groove ball bearing is provided in the other fixed seat. The two ends of the rotating shaft 71 are rotatably connected to the angular contact ball bearing and the deep groove ball bearing respectively, so as to meet the working requirements of the shaft system in an environment with large temperature changes. And one end of the rotating shaft 51 is connected to the output end of the motor 2 through the first coupling 4. The calibration plate 73 is located between the two fixed seats 51 and is connected to the outer wall of one side of the rotating shaft 71. If the rotating shaft 71 is processed into a cylindrical shape, it will increase the difficulty of connecting the calibration plate 73. Therefore, in this embodiment, the cross-section of a section where the rotating shaft 71 is connected to the calibration plate 73 is rectangular, so that when the calibration plate 73 is connected, it is connected to a flat plane, which simplifies the connection difficulty. Because the calibration plate 73 is connected to the outer wall of one side of the rotating shaft 71, the center of mass of the entire calibration component 7 is not on the rotating shaft 71, which will give The motor 2 brings extra torque. In order to avoid the extra torque bringing burden to the motor 2, a counterweight 72 is connected to the outer wall of the rotating shaft 71 on the other side opposite to the calibration plate 73 by screws to balance the extra torque. Because the calibration plate 73 and the counterweight 72 need to be connected to the rotating shaft 71, its structural strength is very important, so the rotating shaft 71 is made of titanium alloy. In order to reduce the deadweight and moment of inertia of the entire calibration assembly 7, the calibration plate 73 is made of aluminum alloy, and the counterweight 72 is made of H62 brass. In order to avoid light leakage in the shading state, the surfaces of the calibration plate 73 and the base 5 are sprayed with de-glare paint.

[0041] A stopper 18 is provided on both sides of the fixing seat 51 near the motor 2, and a stopper 74 is provided integrally at one end of the calibration plate 73 near the stopper 18. In this embodiment, when the calibration plate 73 rotates to the side away from the flip axis 19 and is in a horizontal state, the entire calibration mechanism is in a state as follows: Figure 1 , Figure 2 In the light shielding state shown in FIG. 1 , the incoming light of the space optical remote sensing camera is blocked, and when the calibration plate 73 rotates to the side close to the flip axis 19 and is in a horizontal state, the entire calibration mechanism is in a state as shown in FIG. Figure 3In the light-transmitting state shown, the incoming light of the space optical remote sensing camera is not blocked. Therefore, the position setting of the block 18 and the baffle 74 satisfies: when the calibration plate 73 rotates to the side away from the flip axis 19 and is in a horizontal state, and when the calibration plate 73 rotates to the side close to the flip axis 19 and is in a horizontal state, the baffle 74 abuts against the two blocks 18 respectively, so that the motor 2 does not need to have a high motion accuracy, and the two blocks 18 act as limiters to ensure that when the baffle 74 abuts against the block 18, the calibration plate 73 is in a light-shielding or light-transmitting state.

[0042] The driving assembly includes a flip shaft 19, a first torsion spring 6 and a second torsion spring 8. The flip shaft 19 is fixed to one side of the calibration fixing frame 1 by screws, and the axis of the flip shaft 19 is parallel to the rotating axis 71. A hinge seat is provided on one side of the two fixing seats 51 close to the flip shaft 19. The flip shaft 19 is hinged to the hinge seat. The first torsion spring 6 and the second torsion spring 8 are respectively provided at both ends of the flip shaft 19, and one end of the first torsion spring 6 and the second torsion spring 8 are connected to the base 5, and the other end is connected to the calibration fixing frame 1.

[0043] The feedback assembly includes a potentiometer 11, a proximity switch 10, and a magnetic steel mounting arm 12 for cooperating with the proximity switch 10; the potentiometer 11 is connected to a potentiometer mounting frame 13, and the output end of the potentiometer 11 is connected to the main controller for monitoring the rotation angle of the calibration plate 73. The input end of the potentiometer 11 is fixedly connected to the other end of the rotating shaft 71 through a second coupling 20, so that when the rotating shaft 71 rotates, the potentiometer 11 can monitor the rotation angle of the entire calibration assembly 7 in real time. The proximity switch 10 and the potentiometer 11 are backup measuring means for each other. The proximity switch 10 is arranged on the side of the potentiometer mounting frame 13 close to the fixed seat 51, and there are two proximity switches 10, which are respectively arranged on both sides of the second coupling 20. The magnetic steel mounting arm 12 is fixedly connected to the outer wall of the rotating shaft 71 between the second coupling 20 and the fixed seat 51, and the position setting of the magnetic steel mounting arm 12 and the proximity switch 10 satisfies: when the calibration plate 73 rotates to the side away from the flip axis 19 and is in a horizontal state, or when the calibration plate 73 rotates to the side close to the flip axis 19 and is in a horizontal state, the magnetic steel mounting arm 12 is respectively sensed by the two proximity switches 10, and the output ends of the two proximity switches 10 are respectively connected to the main controller, so that the two proximity switches 10 can detect whether the calibration plate 73 is in a light-shielding or light-transmitting state.

[0044] The structure of the locking release assembly 14 is as follows: Figure 8As shown, it includes a shell 141 and a heater 142, a notch bolt 144, and a shape memory alloy tube 143 arranged in the shell 141. The notch bolt 144, the shape memory alloy tube 143 and the heater 142 are sequentially sleeved in the shell 141 from the inside to the outside. The shell 141 is connected to the bottom of the calibration fixing frame 1 by bolts. A through hole is provided at a position corresponding to the notch bolt 144 on the calibration fixing seat 1, and a threaded hole is provided on the base 5 corresponding to the position of the through hole. The notch bolt 144 passes through the through hole and is screwed into the threaded hole. In this way, the calibration fixing frame 1 and the base 5 are connected together by the notch bolt 144. The connection diagram is shown in FIG. Fig. 9 As shown, a notch is provided on the notch bolt 144, and the notch is located at the joint surface of the base 5 and the calibration fixture 1. The control end of the heater 142 is connected to the main controller. When the main controller detects a fault, the heater 142 is started. The heater 142 heats the shape memory alloy tube 143 to about 80°C, and the shape memory alloy tube 143 will be deformed. Under the phase change force of the shape memory alloy tube 143, the notch bolt 144 will break at the notch, causing the base 5 to lose connection with the calibration fixture 1.

[0045] In order to ensure that the calibration agency is in Figure 4 , Figure 5 In the fault exit state shown, the base 5 and the various components installed on the base 5 will not shake, and a docking locking assembly is also provided. The docking locking assembly includes a docking cone rod 9 arranged on the top of the fixing seat 51 near the potentiometer 11 and a docking cone rod groove 91 arranged on the side wall of the calibration fixing frame 1 on the same side as the flip axis 19. The position setting of the docking cone rod groove 91 and the docking cone rod 9 satisfies: when the base 5 rotates around the flip axis 19 until the bottom surface of the base 5 is in a horizontal state, the docking cone rod 9 is inserted into the docking cone rod groove 91, and the position of the base 5 after rotation around the flip axis 19 is locked and fixed. The docking cone rod 9 and the docking cone rod groove 91 are both made of titanium alloy to ensure strength.

[0046] During normal use, the motor 2 drives the calibration component 7 to rotate to adjust the amount of light entering, and the potentiometer 11 provides real-time feedback of the rotation angle of the calibration component 7. When the calibration plate 73 rotates to the side away from the flip axis 19 and is in a horizontal state, it is in a light-shielding state. If no light shielding is required, the motor 2 drives the calibration component 7 to rotate in the opposite direction. When the calibration plate 73 rotates to the side close to the flip axis 19 and is in a horizontal state, it is in a light-transmitting state.

[0047] If the calibration plate 73 is in the light-shielding position and the motor 2 fails, the main controller detects through the potentiometer 11 that the motor 2 cannot rotate, and an emergency exit is required. First, the main controller starts the heater 142. When the shape memory alloy tube 143 is heated to about 80°C, the shape memory alloy tube 143 will deform. Under the phase change force of the shape memory alloy tube 143, the notch bolt 144 breaks at the notch, causing the base 5 to lose connection with the calibration fixture 1. Subsequently, under the action of the first torsion spring 6 and the second torsion spring 8, the entire base 5 will rotate around the flip axis 19, so that the calibration plate 73 no longer blocks the light entering the space optical remote sensing camera, avoiding the influence on the camera optical path. When the base 5 rotates around the flip axis 19 until the bottom surface of the base 5 is in a horizontal state, the docking cone rod 9 is inserted into the docking cone rod groove 91 to lock and fix the position of the base 5 after rotating around the flip axis 19, fully ensuring the reliability of the mechanism.

[0048] The embodiments described above are merely descriptions of specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A highly reliable calibration mechanism with fault emergency exit capability, characterized in that: It comprises a calibration fixing frame (1), a base (5), an execution component, a driving component, a feedback component, a locking and releasing component (14) and a main controller; The calibration fixing frame (1) is fixedly mounted on the light inlet of the space optical remote sensing camera, and the base (5) is arranged on the calibration fixing frame (1); The execution component comprises a calibration component (7) and a motor (2); two fixing seats (51) are arranged opposite to each other at two ends of the base (5); the motor (2) is connected to the base (5); the calibration component (7) comprises a rotating shaft (71) and a calibration plate (73); the rotating shaft (71) is rotatably connected to the two fixing seats (51) respectively, and one end of the rotating shaft (71) is connected to the output end of the motor (2); the calibration plate (73) is located between the two fixing seats (51) and is connected to the outer wall of one side of the rotating shaft (71); the control end of the motor (2) is connected to the main controller and is used to control the rotation angle of the calibration plate (73) to adjust the amount of light entering; The driving assembly is used to flip the base (5) when a fault occurs, and comprises a flip shaft (19) and a torsion spring. The flip shaft (19) is fixed to one side of the calibration fixing frame (1), the axis of the flip shaft (19) is parallel to the rotation axis (71), and the flip shaft (19) is hinged to one side of the base (5) close to the flip shaft (19); the torsion spring is sleeved on the flip shaft (19), and the two ends are respectively connected to the base (5) and the calibration fixing frame (1); The feedback component comprises a potentiometer (11) arranged on the base (5), and the other end of the rotating shaft (71) is connected to the input end of the potentiometer (11); the output end of the potentiometer (11) is connected to the main controller for monitoring the rotation angle of the calibration plate (73); The locking and releasing assembly (14) comprises a shell (141) and a heater (142), a notch bolt (144) and a shape memory alloy tube (143) arranged in the shell (141). The shell (141) is connected to the bottom of the calibration fixing frame (1). The notch bolt (144), the shape memory alloy tube (143) and the heater (142) are sequentially sleeved in the shell (141) from the inside to the outside. The notch bolt (144) is used to connect the calibration fixing frame (1) and the base (5). The notch bolt (144) is provided with a notch, and the notch is located at the joint surface between the base (5) and the calibration fixing frame (1). The control end of the heater (142) is connected to the main controller and is used to start the heater (142) to heat the shape memory alloy tube (143) in the event of a fault, so that the notch bolt (144) is disconnected at the notch under the action of the phase change force.

2. The high-reliability calibration mechanism with fault emergency exit capability according to claim 1 is characterized in that: Also included is a docking locking assembly; The docking locking assembly comprises a docking cone rod (9) arranged on the top of one of the fixing seats (51) and a docking cone rod groove (91) arranged on the side wall of the calibration fixing frame (1) on the same side as the flip axis (19). The position arrangement of the docking cone rod groove (91) and the docking cone rod (9) satisfies that when the base (5) rotates around the flip axis (19) until the bottom surface of the base (5) is in a horizontal state, the docking cone rod (9) is inserted into the docking cone rod groove (91).

3. The high-reliability calibration mechanism with fault emergency exit capability according to claim 2 is characterized in that: The base (5) is provided with a motor mounting frame (3) and a potentiometer mounting frame (13); the motor mounting frame (3) and the potentiometer mounting frame (13) are respectively located on the outside of the two fixing seats (51); The motor (2) is connected to a motor mounting frame (3), and the output end of the motor (2) is fixedly connected to one end of a rotating shaft (71) via a first coupling (4); The potentiometer (11) is connected to a potentiometer mounting frame (13), and the input end of the potentiometer (11) is fixedly connected to the other end of the rotating shaft (71) via a second coupling (20).

4. The high-reliability calibration mechanism with fault emergency exit capability according to claim 3 is characterized in that: The feedback assembly also includes a proximity switch (10) and a magnetic steel mounting arm (12) for cooperating with the proximity switch (10); The magnetic steel mounting arm (12) is fixedly connected to the outer wall of the rotating shaft (71) between the second coupling (20) and the fixed seat (51); the proximity switch (10) is arranged on a side of the potentiometer mounting frame (13) close to the fixed seat (51), and two proximity switches (10) are arranged, and the two proximity switches (10) are respectively arranged on both sides of the second coupling (20); the position setting of the magnetic steel mounting arm (12) and the proximity switch (10) satisfies: when the calibration plate (73) rotates to a side away from the flip axis (19) and is in a horizontal state, or when the calibration plate (73) rotates to a side close to the flip axis (19) and is in a horizontal state, the magnetic steel mounting arm (12) is respectively sensed by the two proximity switches (10), and the output ends of the two proximity switches (10) are respectively connected to the main controller.

5. The high-reliability calibration mechanism with fault emergency exit capability according to claim 4 is characterized in that: The calibration component (7) further comprises a counterweight (72); a section of the rotating shaft (71) connecting with the calibration plate (73) has a rectangular cross section, and the counterweight (72) is connected to the outer wall of the rotating shaft (71) on the other side opposite to the calibration plate (73) by means of screws.

6. The high-reliability calibration mechanism with fault emergency exit capability according to claim 5, characterized in that: Stoppers (18) are respectively arranged on both sides of one of the fixing seats (51), and a baffle (74) is arranged at one end of the calibration plate (73) close to the stoppers (18). The positions of the stoppers (18) and the baffle (74) are arranged so that when the calibration plate (73) rotates to a side away from the flip axis (19) and is in a horizontal state, and when the calibration plate (73) rotates to a side close to the flip axis (19) and is in a horizontal state, the baffle (74) respectively contacts the two stoppers (18).

7. The high-reliability calibration mechanism with fault emergency exit capability according to claim 6, characterized in that: The torsion spring comprises a first torsion spring (6) and a second torsion spring (8), which are respectively arranged at two ends of the flip shaft (19).

8. The high-reliability calibration mechanism with fault emergency exit capability according to claim 1, characterized in that: A pair of angular contact ball bearings are arranged in one of the fixed seats (51), and a deep groove ball bearing is arranged in the other fixed seat. The two ends of the rotating shaft (71) are connected to the two fixed seats (51) via the angular contact ball bearings and the deep groove ball bearings respectively.

9. The high-reliability calibration mechanism with fault emergency exit capability according to claim 5, characterized in that: The rotating shaft (71), the docking cone rod (9) and the docking cone rod groove (91) are all made of titanium alloy; the calibration fixing frame (1), the calibration plate (73), the motor mounting frame (3) and the potentiometer mounting frame (13) are all made of aluminum alloy; and the counterweight block (72) is made of brass.

Images