CN113359371A - Resettable locking device suitable for space camera focusing mechanism - Google Patents
Resettable locking device suitable for space camera focusing mechanism Download PDFInfo
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- CN113359371A CN113359371A CN202110601855.XA CN202110601855A CN113359371A CN 113359371 A CN113359371 A CN 113359371A CN 202110601855 A CN202110601855 A CN 202110601855A CN 113359371 A CN113359371 A CN 113359371A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 84
- 238000004146 energy storage Methods 0.000 claims abstract description 43
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 22
- 230000009471 action Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 abstract description 3
- 230000004044 response Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
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Abstract
A resettable locking device suitable for a space camera focusing mechanism relates to the technical field of space optical remote sensing and solves the problems of the existing space camera focusing mechanism, and comprises a main body shell, a pin shaft, a memory alloy expansion piece, an energy storage spring, an end cover and a pin hole seat; the pin shaft consists of a straight pin, a shaft body I, a shaft body II, a slot and a shaft end cap which are coaxially processed in sequence and are integrally processed and manufactured; a straight pin hole is processed on the pin hole seat; the memory alloy expansion piece is fixed on the main body shell, the pin shaft is positioned in the main body shell, and the straight pin is matched with the straight pin hole of the pin hole seat; the pin hole seat is fixed on the load locking end of the focusing mechanism through a screw; an energy storage spring is sleeved on the periphery of the shaft body II, and an end cover is fixed on the main body shell at the side of the shaft end cap; the other end of the main body shell is fixed on a focusing mechanism base; the operation flow of the locker is simplified; the structure can not be damaged, and any structure or part does not need to be replaced, so that the full test work can be conveniently carried out in a ground laboratory.
Description
Technical Field
The invention relates to the technical field of space optical remote sensing, in particular to a resettable locker of a space camera focusing mechanism.
Background
Space cameras are often equipped with a focusing mechanism to compensate for optical defocus in order to ensure on-track imaging quality. Meanwhile, the focusing mechanism bears complex and severe vibration load in the rocket launching process. However, in order to ensure that the focusing precision meets the use requirements of the space camera, the focusing mechanism usually adopts a focusing scheme that one side drives the focal plane electronic box, which causes the load of the focusing mechanism to form a large-span cantilever beam structure, so the stress state of the focusing mechanism is extremely poor. Due to the structural characteristics, the basic frequency of the focusing mechanism is often low, the requirement of a space camera on the dynamic stiffness of the focusing mechanism cannot be met, the damage is easy to occur, and the normal work after the focusing mechanism is in orbit is difficult to ensure.
Therefore, there is a need for a device that can not only suppress the vibration response of the focus mechanism during rocket launching, but also improve the reliability of the focus mechanism without affecting the normal focus action of the focus mechanism after the space camera is in orbit.
Disclosure of Invention
The resettable locking device suitable for the space camera focusing mechanism can improve the fundamental frequency of the focusing mechanism, improve the stress state of the focusing mechanism, improve the reliability of the focusing mechanism and realize on-track unlocking.
The resettable locking device suitable for the focusing mechanism of the space camera comprises a main body shell, a pin shaft, a memory alloy expansion piece, an energy storage spring, an end cover and a pin hole seat;
the pin shaft consists of a straight pin, a shaft body I, a shaft body II, a slot and a shaft end cap which are coaxially processed in sequence and are integrally processed and manufactured; a straight pin hole is processed on the pin hole seat;
the memory alloy expansion piece is fixed on the main body shell, the pin shaft is positioned in the main body shell, and the straight pin is matched with the straight pin hole of the pin hole seat; the pin hole seat is fixed on the load locking end of the focusing mechanism through a screw;
an energy storage spring is sleeved on the periphery of the shaft body II, and an end cover is fixed on the main body shell at the side of the shaft end cap; the other end of the main body shell is fixed on a focusing mechanism base;
when the resettable locker is in a locked state, the plug of the memory alloy expansion piece is in an extended state and is inserted into the slot to be used for restricting the movement of the pin shaft, at the moment, the straight pin is inserted into the straight pin hole, the load locking end of the focusing mechanism is locked, and the shaft end cap compresses the energy storage spring to enable the energy storage spring to be in a compressed state;
when the resettable locking device is in an unlocking state, the plug retracts into the memory alloy expansion device, the pin shaft is in an unconstrained state, the straight pin is pulled out of the straight pin hole under the action of the force of the energy storage spring until the end cap of the shaft contacts the end cover, and then the action is stopped, and at the moment, the load locking end of the focusing mechanism is unlocked.
Furthermore, the linear bearing is located in the circumferential direction of the shaft body I and is embedded in the main body shell through a pressing ring.
Furthermore, the main body shell sequentially comprises a locker mounting seat, a cavity I, a cavity II, a retaining shoulder I and a retaining shoulder II, and is integrally machined, manufactured and molded;
the lock mounting base is used for providing a mechanical interface with the focusing mechanism base;
the linear bearing is located in the cavity I and limited through the retaining shoulder I, the shaft body II and the energy storage spring are located in the cavity II and limited through the retaining shoulder II and the shaft end cap, and the shaft end cap is limited through the end cover.
Further, the specific process of the reset operation of the resettable lock is as follows:
firstly, screwing an energy storage screw into a process threaded hole in an end cover and contacting with a shaft end cap, and continuously screwing the energy storage screw until an energy storage spring is in a fully compressed state;
then, penetrating a reset screw into the locking device until the reset screw is screwed into a threaded hole of the fabrication hole on the plug, and continuously screwing the reset screw until the plug retracted into the memory alloy expansion piece is pulled out and is inserted into the slot again;
and finally, screwing out the reset screw and the energy storage screw respectively, and completing reset of the locker.
The invention has the beneficial effects that:
(1) the resettable locking device suitable for the focusing mechanism of the space camera can well limit the displacement of the tail end of the load of the focusing mechanism when the focusing mechanism bears the vibration load, thereby inhibiting the vibration response of the load of the focusing mechanism and simultaneously improving the fundamental frequency of the focusing mechanism. The basic frequency of the focusing mechanism body is 46Hz, and the response amplification factor reaches 7 times under the sine vibration input with the frequency of 100 Hz; the basic frequency of the focusing mechanism after the locker is added is 108Hz, and the response amplification factor is less than 3 times under the condition of sinusoidal vibration input with the frequency of 100 Hz. Therefore, the resettable lock of the invention can improve the fundamental frequency of the focusing mechanism, inhibit vibration response and improve the reliability of the focusing mechanism.
(2) The resettable locker applicable to the space camera focusing mechanism can realize the on-track unlocking function. When the focusing mechanism is in orbit along with the space camera, the locker can generate unlocking action, so that the focusing function of the focusing mechanism is recovered.
(3) The resettable locking device suitable for the focusing mechanism of the space camera locks the load of the focusing mechanism by the pin shaft, and avoids the problem of poor locking performance caused by over-short stroke of the memory alloy expansion piece.
(4) The resettable locking device suitable for the space camera focusing mechanism has the characteristic of resetting, all resetting actions can be completed through the resetting screw and the energy storage screw, on one hand, any disassembly and assembly are not needed, and the operation flow is simplified; on the other hand, the structure can not be damaged, and any structure or part does not need to be replaced, so that the full test work in a ground laboratory is facilitated.
Drawings
FIG. 1 is a schematic view of the mounting position of a resettable lock suitable for use in a focusing mechanism of a spatial camera in accordance with the present invention;
FIG. 2 is a cross-sectional view of a main body housing of a resettable lock for a focusing mechanism of a spatial camera in accordance with the present invention;
fig. 3 is an isometric view of a pin in the repositionable lock for a spatial camera focusing mechanism according to the present invention.
FIG. 4 is an isometric view of a resettable lock suitable for use in a spatial camera focusing mechanism in accordance with the present invention;
FIG. 5 is an exploded view of a resettable lock suitable for use in a spatial camera focusing mechanism in accordance with the present invention;
FIG. 6 is a cross-sectional view of a resettable lock suitable for use in a spatial camera focusing mechanism according to the present invention in a locked state;
FIG. 7 is a cross-sectional view of an unlocked state of a resettable lock suitable for use in a spatial camera focusing mechanism in accordance with the present invention;
FIG. 8 is a cross-sectional view of the reset operation of the resettable lock for a focusing mechanism of a spatial camera in accordance with the present invention;
in the figure: 1. the device comprises a main body shell, 2, a pin shaft, 3, a memory alloy expansion piece, 4, a linear bearing, 5, a pressing ring, 6, an energy storage spring, 7, an end cover, 8, a pin hole seat, 9, a focusing mechanism load driving end, 10, a focusing mechanism load locking end, 11, a focusing mechanism base, 12, a reset screw, 13 and an energy storage screw; 101. the lock comprises a lock mounting seat 102, cavities I and 103, blocking shoulders I and 104, blocking shoulders II and 105, cavities II and 201, straight pins 202, shafts I and 203, slots and 204, shafts II and 205, shaft end caps 301, plugs 801 and straight pin holes.
Detailed Description
The embodiment is described with reference to fig. 1 to 8, and the resettable locking device suitable for the focusing mechanism of the space camera includes a main body housing 1, a pin shaft 2, a memory alloy expansion piece 3, a linear bearing 4, a pressing ring 5, an energy storage spring 6, an end cover 7 and a pin hole seat 8. The space camera focusing mechanism is provided with a focusing mechanism load driving end 9, a focusing mechanism load locking end 10 and a focusing mechanism base 11.
Referring to fig. 2 and 3, the main body housing 1 is formed by a lock mounting seat 101, a cavity i 102, a cavity ii 105, a shoulder i 103 and a shoulder ii 104, and is manufactured and molded integrally.
The pin shaft 2 is formed by a straight pin 201, a shaft body I202, a shaft body II 204, a slot 203 and a shaft end cap 205 which are coaxially processed in sequence and are integrally processed and manufactured.
The pin shaft 2 is positioned in the main body shell 1, and the straight pin 201 is matched with the straight pin hole 801 of the pin hole seat 8; the pin hole seat 8 is fixed on the load locking end 10 of the focusing mechanism through a screw;
an energy storage spring 6 is sleeved on the periphery of the shaft body II 204, and an end cover 7 is fixed at the tail end of the main body shell 1 on the side of the shaft end cap 205; the other end of the main body housing 1 is fixed to the focus mechanism base 11.
Referring to fig. 4 and 5, in the embodiment, the memory alloy telescopic device 3 has a plug 301, and the plug 301 has a threaded hole; the memory alloy expansion piece 3 is fixed on the main body shell 1 through screws.
In the present embodiment, the memory alloy telescopic device 3 can be reused and has the following characteristics: under normal conditions, the plug 301 is in an extended state, and when the memory alloy expansion piece 3 is electrified, the plug 301 can rapidly act until the plug retracts into the memory alloy expansion piece 3; the screw is screwed into the tapped hole of the fabrication hole of the plug 301 to pull it out, and the plug 301 will remain extended until the next power is applied.
In this embodiment, the pin hole seat 8 is provided with a straight pin hole 801; the pin hole seat 8 is fixed on the load locking end 10 of the focusing mechanism through screws.
In this embodiment, the lock mounting base 101 is used to provide a mechanical interface with the focus mechanism base 11; the linear bearing 4 is limited by a retaining shoulder I103 and fixed by a pressing ring 5; the energy storage spring 6 is limited by a retaining shoulder II 104 and a shaft end cap 205; the shaft end cap 205 is retained by the end cap 7; the straight pin 201 can be inserted into and pulled out of the straight pin hole 801; the linear bearing 4 can ensure the reciprocating motion precision of the pin shaft 2; the plug 301 can be inserted into and removed from the slot 203.
In the present embodiment, the energy storage spring 6 is a compression spring. When the lock is in the locked state, the shaft end cap 205 compresses the charging spring 6; when the lock is in the unlocked state, the end cap 205 contacts the end cap 7 to limit the extended length of the stored energy spring 6.
In the present embodiment, the depth of insertion of the straight pin 201 into the straight pin hole 801 is 3 mm. The length of energy storage spring 6 under the compression state is 10mm, and the distance of shaft end cap 205 and end cover 7 is 5mm this moment, and the length of energy storage spring 6 under the extension state is 15mm, and shaft end cap 205 and end cover 7 contact this moment, and then the movement distance behind the round pin axle 2 unblock is 5 mm. The moving distance of the pin shaft 2 is larger than the depth of the straight pin 201 inserted into the straight pin hole 801, so that the lock can be unlocked smoothly.
In the present embodiment, the resettable lock applied to the focusing mechanism of the space camera has two states, i.e., the locked state and the unlocked state in fig. 6 and 7, respectively.
In this embodiment, when the focusing mechanism is in the rocket launching process, the lock should be in the locked state. The plug 301 is in an extended state and inserted into the slot 203 so as to restrict the movement of the pin 2, at which time the straight pin 201 is inserted into the straight pin hole 801, the focusing mechanism load is locked and the charging spring 6 is in a compressed state.
In this embodiment, the lock should be in the unlocked state after the focusing mechanism is in orbit. The plug 301 retracts into the memory alloy expansion piece 3, and the straight pin 201 is rapidly pulled out of the straight pin hole 801 under the action of the force of the energy storage spring 6 due to the unrestraint of the pin shaft 2 until the end cap 205 contacts the end cover 7 and then the action is stopped, at the moment, the load of the focusing mechanism is unlocked, and the energy storage spring 6 is in an extending state.
In this embodiment, the force of the plug 301 limiting the slot 203 is much greater than the elastic force of the energy storage spring 6, so that the pin shaft 2 can be ensured to have no action in a locked state; the elastic force of the energy storage spring 6 is far greater than the sum of the friction force inside the lock and between the straight pin 201 and the straight pin hole 801, so that the pin shaft 2 can be ensured to be smoothly retracted into the main body housing 1 in the unlocking state.
In the present embodiment, the resettable lock applied to the focusing mechanism of the space camera has a resettable function, and the resetting operation requires the reset screw 12 and the energy storage screw 13.
The reset screw 12 can penetrate into the interior of the lock until being screwed into a threaded hole of a fabrication hole on the plug 301; the storage screws 13 may be threaded into threaded bores in the end cap 7 and contact the end cap 205.
In this embodiment, can repeatedly carry out unblock and locking test when ground laboratory, reset operation needs reset screw 12 and energy storage screw 13, and the concrete implementation is: the energy storage screw 13 can be screwed into a process threaded hole on the end cover 7 and contacts the shaft end cap 205, and the energy storage screw 13 is screwed continuously until the energy storage spring 6 is in a fully compressed state; then, the reset screw 12 is inserted into the locking device until the process hole threaded hole on the plug 301 is screwed in, and the reset screw 12 is screwed in continuously until the plug 301 retracted into the memory alloy expansion piece 3 is pulled out and inserted into the slot 203 again; finally, the reset screw 12 and the energy storage screw 13 are respectively screwed out, and the locker is reset.
In this embodiment, the length of the reset screw 12 is customized, so that the plug 301 can be just completely inserted into the slot 203; the energy storage screw 13 is customized in length and can just compress the energy storage spring 6 to 10 mm.
The resettable lock suitable for the focusing mechanism of the space camera in the embodiment has two states: a locked state and an unlocked state. When the focusing mechanism is in the rocket launching process, the locker is in a locked state, the load locking end 10 of the focusing mechanism is locked at the moment, the stress state is improved, and meanwhile the basic frequency of the focusing mechanism is greatly improved. When the focusing mechanism is in orbit, the locker is in an unlocked state, the function of the focusing mechanism is recovered, and the in-orbit focusing action can be normally carried out.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments.
Claims (4)
1. A resettable locking device suitable for a space camera focusing mechanism comprises a main body shell (1), a pin shaft (2), a memory alloy expansion piece (3), an energy storage spring (6), an end cover (7) and a pin hole seat (8); the method is characterized in that:
the pin shaft (2) is sequentially composed of a straight pin (201), a shaft body I (202), a shaft body II (204), a slot (203) and a shaft end cap (205) which are coaxially processed, and is integrally processed, manufactured and molded;
a straight pin hole (801) is processed on the pin hole seat (8);
the memory alloy expansion piece (3) is fixed on the main body shell (1), the pin shaft (2) is positioned in the main body shell (1), and the straight pin (201) is matched with the straight pin hole (801) of the pin hole seat (8); the pin hole seat (8) is fixed on the load locking end (10) of the focusing mechanism through a screw;
an energy storage spring (6) is sleeved on the periphery of the shaft body II (204), and an end cover (7) is fixed on the main body shell (1) at the side of the shaft end cap (205); the other end of the main body shell (1) is fixed on a focusing mechanism base (11);
when the resettable locker is in a locked state, a plug (301) of the memory alloy expansion piece (3) is in an extended state and is inserted into the slot (203) to be used for restricting the movement of the pin shaft (2), at the moment, the straight pin (201) is inserted into the straight pin hole (801), the load locking end (10) of the focusing mechanism is locked, and the shaft end cap (205) compresses the energy storage spring (6) to enable the energy storage spring (6) to be in a compressed state;
when the resettable locking device is in an unlocking state, the plug (301) retracts into the memory alloy expansion piece (3), the pin shaft (2) is in an unconstrained state, the straight pin (201) is pulled out of the straight pin hole (801) under the action of the force of the energy storage spring (6) until the shaft end cap (205) contacts the end cover (7) and then the action is stopped, and at the moment, the load locking end (10) of the focusing mechanism is unlocked.
2. A resettable lock for a focus mechanism of a space camera as claimed in claim 1, wherein: the bearing is characterized by further comprising a linear bearing (4) located in the circumferential direction of the shaft body I (202), wherein the linear bearing (4) is embedded in the main body shell (1) through a pressing ring (5).
3. A resettable lock for a spatial camera focus mechanism as claimed in claim 2, wherein:
the main body shell (1) sequentially comprises a locker mounting seat (101), a cavity I (102), a cavity II (105), a retaining shoulder I (103) and a retaining shoulder II (104), and is integrally machined, manufactured and molded;
the locker mount (101) is used for providing a mechanical interface with the focus mechanism base (11);
the linear bearing (4) is located in the cavity I (102) and limited through the retaining shoulder I (103), the shaft body II (204) and the energy storage spring (6) are located in the cavity II (105) and limited through the retaining shoulder II (104) and the shaft end cap (205), and the shaft end cap (205) is limited through the end cover (7).
4. A resettable lock for a focus mechanism of a space camera as claimed in claim 3, wherein:
the specific process of the reset operation is as follows:
firstly, screwing an energy storage screw (13) into a process threaded hole in an end cover (7) and contacting a shaft end cap (205), and continuously screwing the energy storage screw (13) until an energy storage spring (6) is in a fully compressed state;
then, a reset screw (12) is inserted into the locking device until the reset screw is screwed into a threaded hole of a fabrication hole on the plug (301), and the reset screw (12) is continuously screwed until the plug (301) retracted into the memory alloy expansion piece (3) is pulled out and then is inserted into the slot (203);
and finally, screwing out the reset screw (12) and the energy storage screw (13) respectively, and completing reset of the locking device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110601855.XA CN113359371B (en) | 2021-05-31 | 2021-05-31 | Resettable locking device suitable for space camera focusing mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110601855.XA CN113359371B (en) | 2021-05-31 | 2021-05-31 | Resettable locking device suitable for space camera focusing mechanism |
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| CN113359371A true CN113359371A (en) | 2021-09-07 |
| CN113359371B CN113359371B (en) | 2023-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116560071A (en) * | 2023-07-11 | 2023-08-08 | 北京瑞控信科技股份有限公司 | Quick reflection mirror based on memory alloy locking structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116560071A (en) * | 2023-07-11 | 2023-08-08 | 北京瑞控信科技股份有限公司 | Quick reflection mirror based on memory alloy locking structure |
| CN116560071B (en) * | 2023-07-11 | 2023-10-20 | 北京瑞控信科技股份有限公司 | Quick reflection mirror based on memory alloy locking structure |
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| CN113359371B (en) | 2023-04-07 |
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Effective date of registration: 20240103 Address after: Room 201, Building 5, Northwest Zone, Nanocity, No. 99 Jinjihu Avenue, Suzhou Industrial Park, Suzhou Area, China (Jiangsu) Pilot Free Trade Zone, Suzhou City, Jiangsu Province, 215101 Patentee after: Suzhou jitianxingzhou Space Technology Co.,Ltd. Address before: 130012 No.2699 Qianjin Street, Nanguan District, Changchun City, Jilin Province Patentee before: Jilin University |
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