A locking device at the end of a spaceborne periscope two-dimensional turntable

Abstract

The present invention relates to an end locking device for a spaceborne periscope two-dimensional turntable, belonging to the technical field of locking devices. It solves the technical problems in the prior art that the locking devices either have poor load-bearing performance, or can only provide partial locking, or cannot be reused, and have limitations in the application in the aerospace field. The end locking device for the spaceborne periscope two-dimensional turntable of the present invention includes a two-dimensional turntable, an optical load, a base, a locking movable part, and several cooperating locking parts. The device uses a shape memory alloy switch as a drive, uses a lever assembly to amplify the locking force, uses a spring assembly to bounce off after unlocking, and adopts a hybrid locking method combining multi-point pressing and single-point locking. It uses multiple pressing points for mechanical transmission support to improve stability and dynamic characteristics. At the same time, there is only one locking point to improve reliability, and the device has a small volume, light weight, and can be locked and unlocked repeatedly.

Description

Technical Field

[0001] The present invention belongs to the technical field of locking devices, and particularly relates to an end locking device for a spaceborne periscope-type two-dimensional turntable. Background Art

[0002] During the launch of a remote sensing satellite, affected by the rocket, the mechanical conditions of the remote sensing satellite are relatively harsh. Some moving mechanism loads in the remote sensing satellite will be subjected to vibration and shock, which will affect the accuracy of the moving mechanism loads and even cause serious damage to the interior of the moving mechanism loads. Therefore, in order to ensure that the moving mechanism loads can take off smoothly, it is necessary to lock them, and at the same time, it is required that the mechanical properties after locking are good and the unlocking is reliable.

[0003] In the prior art, common locking devices include pyrotechnics, electromagnetic locking mechanisms, resistance wire fusing mechanisms, and shape memory alloy switches. However, these locking devices either have poor load-bearing performance, can only provide partial locking, or cannot be reused, and their applications in the aerospace field have limitations.

[0004] For a spaceborne laser communication terminal, a common periscope-type two-dimensional turntable is used as a search and tracking moving mechanism. During the satellite launch process, the commonly used locking method is end locking. However, the performance of existing end locking devices needs to be further improved. Summary of the Invention

[0005] The present invention aims to provide an end locking device for a spaceborne periscope-type two-dimensional turntable, which has a small volume, light weight, can be locked and unlocked repeatedly, has high reliability in locking and unlocking, and has strong mechanical properties of the overall device after locking.

[0006] The technical solutions adopted by the present invention to achieve the above purposes are as follows.

[0007] An end locking device for a spaceborne periscope-type two-dimensional turntable includes a two-dimensional turntable, an optical load, a base, a locking movable part, and a plurality of cooperating locking parts;

[0008] The two-dimensional turntable includes an azimuth axis system and an elevation axis system. The azimuth axis system is connected to the base, and the elevation axis system is connected to the azimuth axis system;

[0009] The optical load is connected to the elevation axis system of the two-dimensional turntable;

[0010] An adjustable wedge angle mating assembly for locking the movable part and an upper hook for mating with the locking part are installed on the optical load. A lever assembly for locking the movable part and a lower hook for mating with the locking part are installed on the base. The adjustable wedge angle mating assembly and the lever assembly form a wedge angle mating, and the upper hook and the lower hook form a wedge angle mating to connect the optical load and the base together. The locking movable part controls the degree of freedom of the optical load in one direction, and each of the remaining degrees of freedom of the optical load is controlled by a mating locking part.

[0011] Further, the two-dimensional turntable further includes a connecting member. The azimuth axis system is connected to the base, and the pitch axis system is connected to the azimuth axis system through the connecting member.

[0012] Further, the locking movable part includes a lever assembly, a spring assembly, a load-bearing structure member, a shape memory alloy switch, and an adjustable wedge angle mating assembly;

[0013] The load-bearing structure member includes a load-bearing plate, a U-shaped fixing plate, and an I-shaped fixing frame. The load-bearing plate is fixed on the base, a third through hole is provided on the load-bearing plate, the U-shaped fixing plate and the I-shaped fixing frame are fixed on the load-bearing plate, and a fourth through hole is provided on the U-shaped fixing plate;

[0014] The lever assembly includes a lever and a lever bearing seat. The middle part of the lever is rotatably connected to one end of the lever bearing seat. One end of the lever is provided with a wedge angle, a first through hole is provided on the wedge angle, the other end of the lever is provided with a second through hole, and the other end of the lever bearing seat is rotatably connected to the middle part of the I-shaped fixing frame;

[0015] One end of the spring assembly is connected to the first through hole, and the other end is installed on the base through the third through hole on the load-bearing structure member;

[0016] The shape memory alloy switch is fixed through the fourth through hole of the U-shaped fixing plate, and the pin extractor contact of the shape memory alloy switch is in clearance fit with the second through hole axially.

[0017] Even further, the spring assembly is a hook tension spring.

[0018] Further, the adjustable wedge angle mating assembly includes a V-shaped block, an adjusting block, and a gasket. One side of the adjusting block is provided with a U-shaped groove, and the V-shaped block is inclined and fixed in the U-shaped groove to form a wedge angle, which forms a wedge angle mating with the lever assembly, and the gasket is fixed on the upper surface of the adjusting block.

[0019] Further, the mating locking part includes an upper hook, a lower hook, and a gasket; the upper hook is installed on the optical load, the lower hook is installed on the base, the upper hook and the lower hook are fixed together through a wedge angle, and the gasket is fixed on the surface where the upper hook contacts the optical load.

[0020] Further, the upper hook is composed of a connecting column, an upper hook body and a fixing member. The top end of the connecting column is fixedly connected to the upper hook body, and the bottom end is fixedly connected to the lower hook. The connecting column, the upper hook body and the lower hook are perpendicular to each other pairwise. The top end of the fixing member is fixedly connected to the upper hook body, and the bottom end is fixedly connected to the lower hook. There are two convex plates on the rear side, which are clamped and fixed outside the connecting column. The front side of the fixing member is a wedge angle.

[0021] Further, the adjustable wedge angle matching component is made of stainless steel material, and the lever component is made of titanium alloy material.

[0022] Further, the upper hook is made of stainless steel material, and the lower hook is made of titanium alloy material.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The on-orbit periscope two-dimensional turntable end locking device of the present invention uses a shape memory alloy switch as a drive, uses a lever component to amplify the locking force, and uses a spring component to bounce off after unlocking, which can achieve reliable locking of the two-dimensional turntable, and can be manually locked repeatedly and electrically unlocked. The fundamental frequency before and after repeated locking basically remains unchanged, and the mechanical state changes little.

[0025] 2. The on-orbit periscope two-dimensional turntable end locking device of the present invention adopts a hybrid locking method of multi-point pressing combined with single-point locking, uses multiple pressing points for mechanical transmission support, improves stability and dynamic characteristics. At the same time, there is only one locking point, which improves reliability and prevents the situation where the release cannot be completed when a single locking point fails in the case of multiple locking points.

[0026] 3. All the locking and matching parts of the on-orbit periscope two-dimensional turntable end locking device of the present invention adopt wedge angle matching, with low processing difficulty, high unlocking reliability, and good mechanical properties after locking.

[0027] 4. All the locking and matching parts of the on-orbit periscope two-dimensional turntable end locking device of the present invention adopt different metal materials, which can prevent cold welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a schematic structural diagram of an on-orbit periscope two-dimensional turntable end locking device of the present invention.

[0030] Figure 2Schematic diagram of the locking movable part of the end locking device of a spaceborne periscope two-dimensional turntable according to the present invention.

[0031] Figure 3 Schematic diagram of the adjustable wedge angle matching component of the end locking device of a spaceborne periscope two-dimensional turntable according to the present invention.

[0032] Figure 4 Schematic diagram of the matching locking part of the end locking device of a spaceborne periscope two-dimensional turntable according to the present invention.

[0033] Figure 5 Schematic diagram of the locking principle of the end locking device of a spaceborne periscope two-dimensional turntable according to the present invention.

[0034] Figure 6 Schematic diagram of the unlocking principle of the end locking device of a spaceborne periscope two-dimensional turntable according to the present invention.

[0035] In the figure, 1. Two-dimensional turntable, 2. Optical load, 3. Base, 4. Locking movable part, 4-1. Lever assembly, 4-2. Spring assembly, 4-3. Load-bearing structural member, 4-4. Shape memory alloy switch, 4-5. Adjustable wedge angle matching component, 4-5-1. V-shaped block, 4-5-2. Adjusting block, 4-5-3. Gasket, 5. Matching locking part, 5-1. Upper hook, 5-2. Lower hook, 5-3. Gasket. Detailed implementation manners

[0036] To further understand the present invention, the preferred implementation manners of the present invention are described below. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0037] As Figure 1 shown, the end locking device of the spaceborne periscope two-dimensional turntable according to the present invention includes a two-dimensional turntable 1, an optical load 2, a base 3, a locking movable part 4, and a plurality of matching locking parts 5.

[0038] The two-dimensional turntable 1 is installed on the base 3. Preferably, the two-dimensional turntable 1 includes an azimuth axis system 1-1, an elevation axis system 1-2, and a connecting member. The azimuth axis system 1-1 is connected to the base 3, and the elevation axis system 1-2 is connected to the azimuth axis system 1-1 through the connecting member.

[0039] The optical load 2 is installed at the end of the two-dimensional turntable 1 and is connected to the pitching axis system 1-2 of the two-dimensional turntable 1. An adjustable wedge angle fitting assembly 4-5 for locking the movable part 4 and an upper hook 5-1 for fitting and locking the locking part 5 are installed on the optical load 2. A lever assembly 4-1 for locking the movable part 4 and a lower hook 5-2 for fitting and locking the locking part 5 are installed on the base 3. The adjustable wedge angle fitting assembly 4-5 and the lever assembly 4-1 form a wedge angle fit, and the upper hook 5-1 and the lower hook 5-2 form a wedge angle fit, thereby connecting the optical load 2 and the base 3 together. The two-dimensional turntable 1, the optical load 2, and the base 3 are integrally connected to form an annular structure. It should be noted that the locking movable part 4 controls one degree of freedom of the optical load 2 for locking and unlocking the optical load 2. Each of the remaining degrees of freedom of the optical load 2 is controlled by a fitting locking part 5, and the number of fitting locking parts 5 is determined according to needs.

[0040] As Figure 2 shown, the locking movable part 4 includes a lever assembly 4-1, a spring assembly 4-2, a load-bearing structure member 4-3, a shape memory alloy switch 4-4, and an adjustable wedge angle fitting assembly 4-5. The load-bearing structure member 4-3 includes a load-bearing plate, a U-shaped fixing plate, and an I-shaped fixing frame. These three parts are integrally fixed. The load-bearing plate is fixed on the base 3. A third through hole is provided on the load-bearing plate. The U-shaped fixing plate and the I-shaped fixing frame are fixed on the load-bearing plate. A fourth through hole is provided on the U-shaped fixing plate. The lever assembly 4-1 includes a lever and a lever bearing seat. The middle of the lever is rotatably connected to the lever bearing seat. One end of the lever is provided with a wedge angle, and a first through hole is provided on the wedge angle. The other end of the lever is provided with a second through hole. The diameter of the first through hole is smaller than that of the second through hole. The lever bearing seat is fixed in the middle of the I-shaped fixing frame. Preferably, the lever assembly 4-1 is made of titanium alloy material. One end of the spring assembly 4-2 is connected to the first through hole, and the other end is installed on the base 3 through the third through hole on the load-bearing plate. The spring assembly 4-2 is preferably a hook tension spring. The shape memory alloy switch 4-4 is fixed through the fourth through hole of the U-shaped fixing plate. The shape memory alloy switch 4-4 has a retractable detent contact. The detent contact has a clearance fit with the second through hole, and there is a force interaction between the two through point contact. The contact force between the detent contact of the shape memory alloy switch 4-4 and the axis of the second through hole is used to overcome the pulling force of the spring assembly 4-2 and the force of the adjustable wedge angle fitting assembly 4-5 on the lever assembly 4-1. As Figure 3 shown, the adjustable wedge angle fitting assembly 4-5 includes a V-shaped block 4-5-1, an adjustment block 4-5-2, and a gasket 4-5-3. A U-shaped groove is provided on one side of the adjustment block 4-5-2. The V-shaped block 4-5-1 is inclined and fixed in the U-shaped groove to form a wedge angle, which is in wedge angle fit with the fitting locking part 5. The gasket 4-5-3 is fixed on the upper surface of the adjustment block 4-5-2. Preferably, the adjustable wedge angle fitting assembly 4-5 is made of stainless steel material.

[0041] As Figure 4As shown in the figure, the mating locking part 5 includes an upper hook 5-1, a lower hook 5-2 and a gasket 5-3. The upper hook 5-1 is installed on the optical load 2, the lower hook 5-2 is installed on the base 3, and the upper hook 5-1 and the lower hook 5-2 are fixed together by a wedge angle. The gasket 5-3 is fixed on the surface of the upper hook 5-1 in contact with the optical load 2. Preferably, the upper hook 5-1 is composed of a connecting column, an upper hook body and a fixing member. The top end of the connecting column is fixedly connected to the upper hook body, the bottom end is fixedly connected to the lower hook 5-2, and the connecting column, the upper hook body and the lower hook 5-2 are perpendicular to each other in pairs. The top end of the fixing member is fixedly connected to the upper hook body, the bottom end is fixedly connected to the lower hook 5-2, and two convex plates are provided on the rear side, which are clamped and fixed outside the connecting column. The front side of the fixing member is a wedge angle. The lower hook 5-2 is usually a triangular prism provided with a through hole. Preferably, the upper hook 5-1 is made of stainless steel material, and the lower hook 5-2 is made of titanium alloy material. There are several mating locking parts 5, leaving only the degree of freedom of the optical load 2 in one direction, which is used to lock and unlock the movable part. The locking movable part 4 locks the only degree of freedom, thereby realizing the complete locking of the mechanism. When the locking movable part 4 is unlocked, the only degree of freedom is released, and the two-dimensional turntable 1 rotates out along the degree of freedom in this direction, thereby completing the unlocking of the mating locking part 5, and the mechanism is completely unfolded at this time.

[0042] The working principle of the present invention is as follows: The locking state of a spaceborne periscope two-dimensional turntable end locking device of the present invention is as shown in Figure 5 the figure. One end of the lever assembly 4-1 is engaged with the adjustable wedge angle mating assembly 4-5, and is subjected to the extrusion force of the adjustable wedge angle mating assembly 4-5 and the pulling force of the spring assembly 4-2. The other end is connected to the shape memory alloy switch 4-4 and is subjected to the extrusion force of the shape memory alloy switch 4-4. The forces at both ends are balanced, realizing the balance of the lever assembly 4-1. The upper hook 5-1 and the lower hook 5-2 are engaged with each other, and there is an extrusion force between them. One end of the end of the optical load 2 (inter-satellite laser load) in the horizontal direction is subjected to the force of the lever assembly 4-1 on the adjustable wedge angle mating assembly 4-5, and the other end is subjected to the force of the lower hook 5-2 on the upper hook 5-1, realizing balance. In the vertical direction, it is balanced by the forces on the two mating surfaces of the two wedge angles of the adjustable wedge angle mating assembly 4-5 and the upper hook 5-1. In this state, the optical load 2 is locked. The unlocking state of a spaceborne periscope two-dimensional turntable end locking device of the present invention is as shown in Figure 6As shown in the figure, when unlocking, the shape memory alloy switch 4-4 retracts, and the force on the lever assembly 4-1 is unbalanced. The pulling force of the spring assembly 4-2 pulls the lever assembly 4-1 to one side, causing the mating part between one end of the lever assembly 4-1 and the adjustable wedge angle mating assembly 4-5 to disengage, and the adjustable wedge angle mating assembly 4-5 is no longer stressed. The optical load 2 is unbalanced in the horizontal direction and one end disengages. At this time, the two-dimensional turntable 1 can rotate around the azimuth axis system 1-1, and the optical load 2 moves out horizontally. The upper hook 5-1 disengages from the lower hook 5-2, and there are no longer any constraints on the optical load 2 in the horizontal and vertical directions at the end, and it is only connected to the pitch axis system 1-2 of the two-dimensional turntable 1 at the top. Thus, the optical load 2 is unlocked.

[0043] Obviously, the above embodiments are only examples given for clear illustration and not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all embodiments here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. Spaceborne periscope two-dimensional turntable end locking device, characterized in that It includes a two-dimensional turntable (1), an optical load (2), a base (3), a locking movable part (4) and several mating locking parts (5); The two-dimensional turntable (1) includes an azimuth axis system (1-1) and an elevation axis system (1-2). The azimuth axis system (1-1) is connected to the base (3), and the elevation axis system (1-2) is connected to the azimuth axis system (1-1); The optical load (2) is connected to the elevation axis system (1-2) of the two-dimensional turntable (1); An adjustable wedge angle mating component (4-5) of the locking movable part (4) and an upper hook (5-1) of the mating locking part (5) are installed on the optical load (2). A lever component (4-1) of the locking movable part (4) and a lower hook (5-2) of the mating locking part (5) are installed on the base (3). The adjustable wedge angle mating component (4-5) and the lever component (4-1) form a wedge angle mating, and the upper hook (5-1) and the lower hook (5-2) form a wedge angle mating to connect the optical load (2) and the base (3) together. The locking movable part (4) controls the degree of freedom of one direction of the optical load (2), and each remaining direction of the degree of freedom of the optical load (2) is controlled by a mating locking part (5); The locking movable part (4) includes a lever component (4-1), a spring component (4-2), a load-bearing structure member (4-3), a shape memory alloy switch (4-4) and an adjustable wedge angle mating component (4-5); The load-bearing structure member (4-3) includes a load-bearing plate, a U-shaped fixing plate and an I-shaped fixing frame. The load-bearing plate is fixed on the substrate. A third through hole is provided on the load-bearing plate. The U-shaped fixing plate and the I-shaped fixing frame are fixed on the load-bearing plate, and a fourth through hole is provided on the U-shaped fixing plate; The lever component (4-1) includes a lever and a lever bearing seat. The middle of the lever is rotatably connected to one end of the lever bearing seat. A wedge angle is provided at one end of the lever, a first through hole is provided on the wedge angle, a second through hole is provided at the other end of the lever, and the other end of the lever bearing seat is rotatably connected to the middle of the I-shaped fixing frame; One end of the spring component (4-2) is connected to the first through hole, and the other end is installed on the base (3) through the third through hole on the load-bearing structure member; The shape memory alloy switch is fixed through the fourth through hole of the U-shaped fixing plate, and the pin extractor contact of the shape memory alloy switch is in clearance fit with the second through hole axially.

2. The on-orbit periscope two-dimensional turntable end locking device according to claim 1, characterized in that The two-dimensional turntable (1) includes an azimuth axis system (1-1), an elevation axis system (1-2) and a connecting member. The azimuth axis system (1-1) is connected to the base (3), and the elevation axis system (1-2) is connected to the azimuth axis system (1-1) through the connecting member.

3. The end locking device of the spaceborne periscope two-dimensional turntable according to claim 1, characterized in that, The spring component (4-2) is a hook tension spring.

4. The on-orbit periscope type two-dimensional turntable end locking device according to claim 1, wherein The adjustable wedge angle mating component (4-5) includes a V-shaped block (4-5-1), an adjusting block (4-5-2) and a gasket (4-5-3). A U-shaped groove is provided on one side of the adjusting block (4-5-2). The V-shaped block (4-5-1) is inclined and fixed in the U-shaped groove to form a wedge angle, and the gasket (4-5-3) is fixed on the upper surface of the adjusting block (4-5-2).

5. The on-orbit periscope two-dimensional turntable end locking device according to claim 1, characterized in that, The said engaging and locking part (5) includes an upper hook (5-1), a lower hook (5-2) and a gasket (5-3); the upper hook (5-1) is installed on the optical load (2), the lower hook (5-2) is installed on the base (3), the upper hook (5-1) and the lower hook (5-2) are fixed together by a wedge angle, and the gasket (5-3) is fixed on the surface where the upper hook (5-1) contacts the optical load (2).

6. The on-orbit periscope two-dimensional turntable end locking device according to claim 1, characterized in that, The said upper hook (5-1) consists of a connecting column, an upper hook body and a fixing piece. The top end of the connecting column is fixedly connected to the upper hook (5-1) body, the bottom end is fixedly connected to the lower hook (5-2), and the connecting column, the upper hook body and the lower hook (5-2) are perpendicular to each other in pairs. The top end of the fixing piece is fixedly connected to the upper hook body, the bottom end is fixedly connected to the lower hook (5-2), and there are two convex plates on the rear side, which are clamped and fixed outside the connecting column. The front side of the fixing piece is a wedge angle.

7. The end locking device of the spaceborne periscope two-dimensional turntable according to claim 1, characterized in that, The said adjustable wedge angle engaging component (4-5) is made of stainless steel material, and the lever component (4-1) is made of titanium alloy material.

8. The end locking device of the spaceborne periscope two-dimensional turntable according to claim 1, characterized in that, The said upper hook (5-1) is made of stainless steel material, and the lower hook (5-2) is made of titanium alloy material.

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