An extension support device for deployment of a C-shaped elastic boom

Abstract

This invention proposes an extension support device for deploying a C-shaped elastic extender, comprising: a base, an extension mechanism assembly, a spring push rod assembly, a bracket, an extension mechanism connecting rod, a C-rod front end connecting assembly, a locking hook assembly, a reel assembly, a transmission rope, and a double C-rod structure. Compared with existing support devices, it provides better support during the C-rod deployment process and in its fully deployed state, better meeting the stringent requirements of spacecraft for lightweight and compact folding, and broadening the application scenarios of the C-shaped elastic extender. During deployment, the locking hook unlocking and the locking action of the extension mechanism assembly at the predetermined position are both automatically executed, and both are achieved through mechanical structures, eliminating the need for pyrotechnics. This ensures a smooth and stable deployment and locking process, effectively preventing damage to the C-shaped elastic extender caused by large impact loads during deployment. Deployment is driven by the C-rod deployment force, eliminating the need for additional drive equipment and reducing the overall complexity of the device.

Description

Technical Field

[0001] This invention belongs to the field of mechanical design technology, specifically relating to an extension support device for deploying a C-shaped elastic extension rod. Background Technology

[0002] The application of C-shaped elastic struts in space missions is becoming increasingly widespread, such as in solar array deployment mechanisms and antenna deployment mechanisms. Compared to traditional hinged deployment mechanisms, C-shaped elastic struts offer advantages such as a high deployment-to-retraction ratio, lightweight construction, and simple structure. However, in actual service, the C-shaped elastic strut forms a transition section with low bending stiffness due to its coiling and winding. Existing struts are mostly used in the weightless environment of space, where the transition section bears a relatively small self-weight load. Therefore, simple support structures are typically only installed at the root of the transition section near the coiled end. When the C-shaped elastic strut is used in a gravity environment (such as ground testing or planetary surface missions), its self-weight generates a large bending moment in the transition section. Relying solely on simple support at the root is insufficient to prevent bending and buckling of the strut transition section under heavy loads. Furthermore, existing support devices generally suffer from bulky structures and large coiled volumes, failing to meet the stringent requirements of spacecraft for lightweight and compact design. Therefore, it is necessary to develop a lightweight device with a small coiled volume that can effectively support the transition section of the C-shaped elastic strut. Summary of the Invention

[0003] To address the problem that existing support devices for C-shaped elastic extension rods are insufficient to meet the requirements of use in gravity environments during space missions, the present invention aims to provide a lightweight, compact, and extendable support device.

[0004] The objective of this invention is achieved through the following technical solution: An extension support device for deploying a C-shaped elastic extension rod, characterized in that it comprises: a base, an extension mechanism assembly, a spring push rod assembly, a bracket, an extension mechanism connecting rod, a C-rod front end connecting assembly, a locking hook assembly, a reel assembly, a transmission rope, and a double C-rod structure; The double C-bar structure is large in size when fully deployed, and its transition section has low bending stiffness. If it is used in a gravity environment, the transition section needs to be supported to prevent bending and buckling. Considering the spacecraft's weight and envelope volume limitations, the extension mechanism component adopts an extended configuration.

[0005] The base is provided with multiple supports for mounting and fixing the extension mechanism assembly and the reel assembly; The extension mechanism assembly includes an outer frame, an outer slide rail, an inner slide rail, an inner frame, a root base connector, a front base connector, and a connecting rod connector. The entire assembly is fixed to the base via the root base connector and the front base connector, and connected to the connecting rod connector via the connecting rod connector. It employs a drawer-type sliding mechanism. Both the outer and inner frames are made of carbon fiber square tubing. The inner and outer slide rails are clamped and fixed to the inner and outer frames respectively using bolts and nuts. The inner and outer slide rails allow the inner frame to extend relative to the outer frame along the extension direction. The spring push rod assembly includes a spring push rod base, a spring, a push rod, and a limiting nut. The entire assembly is fixed to the extension mechanism assembly via the spring push rod base. The push rod is cylindrical, with an annular boss and a thread machined at its middle and bottom for mounting the spring and the limiting nut. The spring is installed inside the spring push rod base and can push the push rod to slide along the inside of the spring push rod base by the annular boss acting on it. Under the action of the spring force, the push rod elastically slides into contact with the inner frame of the extension mechanism. When the extension mechanism assembly extends to a predetermined position, the top of the push rod enters a groove on the inner frame of the extension mechanism, locking the inner frame and preventing it from retracting along the outer frame. The limiting nut is screwed to the bottom of the push rod to prevent the push rod from popping out of the spring push rod base under the action of the spring force. The extension mechanism connecting rod is installed at the front of the extension mechanism assembly and is connected to the extension mechanism connecting rod joint by bolts. The bracket is installed on the left and right sides of the extension mechanism connecting rod and is fixed to the extension mechanism connecting rod joint by bolts. It is used to provide extension support for the double C rod during and in the extended state. The overall shape is machined into an elliptical arc shape that matches the cross-sectional profile of the C rod. In order to prevent damage to the C rod during the extension process, the edge of the arc is rounded. The C-rod front-end connecting assembly includes a C-rod front-end connecting rod, a clamping plate, a C-rod front-end connecting bracket, and a connecting rod connector. The connecting rod connector has an overall "I"-shaped structure, with its left and right sides respectively glued and fixed to the two C-rod front-end connecting rods. A pre-drilled hole is provided in the middle of the connecting rod connector for connecting to the transmission rope. The C-rod front-end connecting bracket is glued and fixed to the two C-rod front-end connecting rods. The clamping plate has threaded holes and is connected to the C-rod front-end connecting bracket by bolts, clamping and fixing the clamping plate and the C-rod front-end connecting bracket to the front end of the double C-rod structure. Thus, the double C-rod structure is connected as a whole through the C-rod front-end connecting assembly.

[0006] The locking hook assembly includes a locking hook, a rotating shaft, a locking hook base, and a torsion spring. The entire assembly is mounted on the extension mechanism connecting rod via the locking hook base. The locking hook base has a mounting hole for mounting the rotating shaft, and the locking hook also has a corresponding mounting hole. The rotating shaft passes through both the mounting holes in the locking hook base and the locking hook, allowing the locking hook to rotate relative to the locking hook base around the rotating shaft. The torsion spring is sleeved on the rotating shaft, with one end confined within a groove on the locking hook base, and the other end acting on the locking hook to apply an elastic clamping force, keeping the locking hook pressed downwards against the locking hook base in its initial state. When the extension mechanism assembly is not extended to the predetermined position, the locking hook remains connected to the transmission rope under the clamping action of the torsion spring, thereby maintaining the connection between the extension mechanism connecting rod and the C-rod front end connecting assembly. When the extension mechanism assembly extends to the predetermined position, the rope in the reel assembly is fully released. Under tension, the rope drives the locking hook to overcome the elastic clamping force of the torsion spring and rotates around the pivot in the opposite direction to the clamping direction of the torsion spring. The transmission rope is released from the constraint of the locking hook, thereby realizing the unlocking and separation between the extension mechanism connecting rod and the front end connecting assembly of the C rod. The reel assembly includes a housing, a coil spring, and a rope. The entire assembly is fixed to the support of the base by the housing. The coil spring and the rope are initially coiled and wound inside the housing. One end of the rope is connected to the coil spring, and the other end is tied to the locking hook. During the extension mechanism assembly's unfolding process, before it reaches the predetermined position, the rope overcomes the elastic restoring force of the coil spring under the traction of the locking hook and is gradually released outward from the housing. When the extension mechanism assembly reaches the predetermined position, the rope is just fully released and straightened. At this time, the rope pulls the locking hook to rotate and unlock. One end of the transmission rope is connected to a pre-drilled hole in the connecting rod joint, and the other end is initially fitted onto the locking hook. During the unfolding of the extension mechanism assembly but before it reaches the predetermined position, the transmission rope remains connected under the constraint of the locking hook, and transmits the unfolding driving force of the double C-bar structure from the C-bar front end connecting assembly to the extension mechanism connecting rod, thereby driving the extension mechanism assembly to move synchronously with the C-bar front end connecting assembly. When the extension mechanism assembly reaches the predetermined position, the locking hook rotates under the traction of the rope, releasing the constraint on the transmission rope and causing the transmission rope to disengage from the locking hook, thereby unlocking and separating the C-bar front end connecting assembly from the extension mechanism connecting rod. The C-bar front end connecting assembly continues to move in the unfolding direction under the unfolding driving force of the double C-bar structure, while the extension mechanism connecting rod, the extension mechanism assembly, and the bracket remain in the predetermined position, providing support for the transition section of the double C-bar structure.

[0007] The beneficial effects of this invention compared to the prior art are as follows: 1. This invention designs an extension support device for the deployment of a C-shaped elastic extension rod. Compared with existing support devices, it provides better support for the C-rod during deployment and in its fully deployed state. At the same time, compared with fixed support, it is more conducive to meeting the strict requirements of spacecraft for lightweight and compact folding, thus broadening the application scenarios of the C-shaped elastic extension rod.

[0008] 2. In this invention, the locking hook unlocking and the extension mechanism component locking actions at the predetermined position are both automatically executed during the unfolding process, and both are achieved through mechanical structures without the need for pyrotechnics. This makes the entire unfolding and locking process smooth and stable, effectively preventing damage to the C-shaped elastic extension rod caused by large impact loads during the unfolding process.

[0009] 3. The extension mechanism component of the present invention unfolds under the action of the C-rod's unfolding driving force, without the need for additional driving equipment, thus reducing the complexity of the overall device. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the present invention in a retracted state.

[0011] Figure 2 This is a schematic diagram of the structure of the present invention in its fully unfolded state.

[0012] Figure 3 This is a schematic diagram of the extension mechanism component of the present invention in the state of being extended to a predetermined position.

[0013] Figure 4 This is a schematic diagram of the extension mechanism component structure of the present invention.

[0014] Figure 5These are enlarged views and partial sectional views of the spring push rod assembly structure of the present invention.

[0015] Figure 6 This is a partially enlarged view of the locking hook assembly structure of the present invention.

[0016] Figure 7 This is a schematic diagram of the C-bar front end connection assembly structure of the present invention.

[0017] Figure 8 This is a schematic diagram of the reel assembly structure of the present invention.

[0018] The labels in the diagram are explained as follows: 1. Base, 2. Extension mechanism assembly, 3. Spring push rod assembly, 4. Bracket, 5. Extension mechanism connecting rod, 6. C-bar front end connection assembly, 7. Locking hook assembly, 8. Thread reel assembly, 9. Drive rope, 10. Double C-bar structure, 11. Outer frame of the extension mechanism; 12. Outer layer of the extension mechanism slide rail; 13. Inner layer of the extension mechanism slide rail. 14. Inner frame of the extension mechanism; 15. Root base joint of the extension mechanism; 16. Front base joint of the extension mechanism; 17. Connecting rod joint of the extension mechanism; 18. Spring push rod base; 19. Spring; 20. Push rod. 21. Limit nut; 22. C-rod front connecting rod; 23. Clamping plate; 24. C-rod front connecting bracket. 25. Connecting rod joint; 26. Locking hook base; 27. Rotary shaft; 28. Torsion spring; 29. ​​Locking hook; 30. Housing. 31. Coil spring; 32. Rope. Detailed Implementation

[0019] 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.

[0020] The objective of this invention is achieved through the following technical solution: An extension support device for deploying a C-shaped elastic extension rod, characterized in that it comprises: a base 1, an extension mechanism assembly 2, a spring push rod assembly 3, a bracket 4, an extension mechanism connecting rod 5, a C-rod front end connecting assembly 6, a locking hook assembly 7, a reel assembly 8, a transmission rope 9, and a double C-rod structure 10. The double C-bar structure 10 has a large size when fully unfolded, such as... Figure 2As shown, its transition section has low bending stiffness. If it is used in a gravity environment, it is necessary to support its transition section to prevent bending buckling. Considering the spacecraft's weight and envelope volume limitations, the extension mechanism component 2 adopts an extended configuration.

[0021] The base 1 is provided with multiple supports for mounting and fixing the extension mechanism assembly 2 and the reel assembly 8; The extension mechanism assembly 2 includes an extension mechanism outer frame 11, an extension mechanism slide rail outer layer 12, an extension mechanism slide rail inner layer 13, an extension mechanism inner frame 14, an extension mechanism root base joint 15, an extension mechanism front base joint 16, and an extension mechanism connecting rod joint 17. The entire assembly is fixed to the base 1 via the extension mechanism root base joint 15 and the extension mechanism front base joint 16, and is connected to the extension mechanism connecting rod 5 via the extension mechanism connecting rod joint 17. It adopts a drawer-type sliding mechanism. Figure 4 As shown. Both the outer frame 11 and the inner frame 14 of the extension mechanism are carbon fiber square tubing structures. The outer layer 12 and the inner layer 13 of the extension mechanism slide rail are clamped and fixed to the outer frame 11 and the inner frame 14 of the extension mechanism respectively by bolts and nuts. Through the relative sliding between the inner layer 13 and the outer layer 12, the inner frame 14 of the extension mechanism unfolds relative to the outer frame 11 along the extension direction. Spring push rod assembly 3 includes spring push rod base 18, spring 19, push rod 20, and limiting nut 21. The entire assembly is fixed to extension mechanism assembly 2 via spring push rod base 18. Figure 5 As shown. The push rod 20 is cylindrical, with annular bosses and threads machined at the middle and bottom for mounting the spring 19 and the limiting nut 21. The spring 19 is installed inside the spring push rod base 18 and can push the push rod 20 to slide along the inside of the spring push rod base 18 through the annular boss acting on it. Under the action of the spring force, the push rod 20 elastically slides into contact with the inner frame 14 of the extension mechanism. When the extension mechanism assembly 2 extends to the predetermined position, the top of the push rod 20 enters the groove on the inner frame 14 of the extension mechanism, locking the inner frame 14 and preventing it from retracting along the outer frame 11 of the extension mechanism. The limiting nut 21 is screwed to the bottom of the push rod 20 to prevent the push rod 20 from popping out of the spring push rod base 18 under the action of the spring force.

[0022] The extension mechanism connecting rod 5 is installed at the front of the extension mechanism assembly 2 and is bolted to the extension mechanism connecting rod joint 17.

[0023] The bracket 4 is installed on the left and right sides of the extension mechanism connecting rod 5 and is fixed to the extension mechanism connecting rod joint 17 by bolts. It is used to provide extension support for the double C rod structure 10 during and in the unfolded state. The overall shape is machined into an elliptical arc shape that matches the cross-sectional profile of the C rod. In order to prevent damage to the C rod during the unfolding process, the arc edge is rounded. The C-bar front end connection assembly 6 includes a C-bar front end connection rod 22, a clamping plate 23, a C-bar front end connection bracket 24, and a connection rod connector 25, such as Figure 7 As shown. The connecting rod joint 25 has an overall "I" shape structure. Its left and right sides are respectively glued and fixed to the front connecting rods 22 of the two C rods. The connecting rod joint 25 has a reserved hole in the middle for connecting to the transmission rope 9. The C rod front connecting bracket 24 is glued and fixed to the front connecting rods 22 of the two C rods respectively. The clamping plate 23 has a threaded hole and is connected to the C rod front connecting bracket 24 by bolts to clamp and fix the clamping plate 23 and the C rod front connecting bracket 24 to the front end of the double C rod structure 10. Thus, the double C rod structure 10 is connected as a whole by the C rod front connecting assembly 6. The locking hook assembly 7 includes a locking hook 29, a rotating shaft 27, a locking hook base 26, and a torsion spring 28. The entire assembly is mounted on the extension mechanism connecting rod 5 via the locking hook base 26. Figure 6 As shown. The hook base 26 has mounting holes for mounting the rotating shaft 27, and the hook 29 also has corresponding mounting holes. The rotating shaft 27 passes through the mounting holes of the hook base 26 and the hook 29, allowing the hook 29 to rotate relative to the hook base 26 around the rotating shaft 27. A torsion spring 28 is sleeved on the rotating shaft 27. One end of the torsion spring 28 is confined within a groove on the hook base 26, while the other end acts on the hook 29 to apply an elastic clamping force, keeping the hook 29 pressed downward against the hook base 26 in its initial state. When the extension mechanism assembly 2 has not extended to the predetermined position, the hook 29 remains connected to the transmission rope 9 under the clamping action of the torsion spring 28, thereby maintaining the connection between the extension mechanism connecting rod 5 and the C-rod front end connecting assembly 6. When the extension mechanism assembly 2 extends to the predetermined position, the rope 32 in the reel assembly 8 is fully released. Under tension, the rope 32 drives the locking hook 29 to overcome the elastic clamping force of the torsion spring 28 and rotates around the rotating shaft 27 in the opposite direction to the clamping direction of the torsion spring 28. The transmission rope 9 is released from the constraint of the locking hook 29, thereby realizing the unlocking and separation between the extension mechanism connecting rod 5 and the C rod front end connecting assembly 6.

[0024] The reel assembly 8 includes a housing 30, a coil spring 31, and a rope 32, such as Figure 8As shown, the entire assembly is fixed to the support of the base 1 by the outer shell 30. The coil spring 31 and the rope 32 are initially coiled and wound inside the outer shell 30. One end of the rope 32 is connected to the coil spring 31, and the other end is tied to the locking hook assembly 7. During the unfolding process of the extension mechanism assembly 2 and before it has reached the predetermined position, the rope 32 overcomes the elastic restoring force of the coil spring 31 under the traction of the locking hook 29 and is gradually released outward from inside the outer shell 30. When the extension mechanism assembly 2 has reached the predetermined position, the rope 32 is just fully released and taut. At this time, the rope 32 pulls the locking hook 29 to rotate and unlock under tension. One end of the transmission rope 9 is connected to the pre-drilled hole in the connecting rod joint 25, and the other end is initially fitted onto the locking hook 29. During the unfolding of the extension mechanism assembly 2, before it reaches the predetermined position, the transmission rope 9 remains connected under the constraint of the locking hook 29, and transmits the unfolding driving force of the double C-rod structure 10 from the C-rod front end connecting assembly 6 to the extension mechanism connecting rod 5, thereby driving the extension mechanism assembly 2 to move synchronously with the C-rod front end connecting assembly 6. When the extension mechanism assembly 2 reaches the predetermined position, the locking hook 29 rotates under the traction of the rope 32, releasing the constraint on the transmission rope 9, causing the transmission rope 9 to disengage from the locking hook 29, thereby unlocking and separating the C-rod front end connecting assembly 6 from the extension mechanism connecting rod 5. The C-rod front end connecting assembly 6 continues to move in the unfolding direction under the unfolding driving force of the double C-rod structure 10, while the extension mechanism connecting rod 5, the extension mechanism assembly 2, and the bracket 4 remain in the predetermined position, providing support for the transition section of the double C-rod structure 10.

[0025] The working process of the extension support device for deploying a C-shaped elastic extension rod according to the present invention is as follows: Initially, the entire extension mechanism assembly 2 and the double C-bar structure 10 are in the retracted state, such as Figure 1 As shown. When the double C-bar structure 10 unfolds parallel from its retracted state, it pushes the C-bar front connecting rod 22 and the C-bar front connecting rod joint 25 forward through the C-bar front connecting bracket 24. At this time, the transmission rope 9 attached to the C-bar front connecting rod joint 25 drags the locking hook assembly 7, which is in a locked state, thereby pulling the extension mechanism connecting rod 5 and the extension mechanism assembly 2 to move in the unfolding direction. The rope 32 in the reel assembly is gradually pulled out from the outer shell 30. During this process, the bracket 4 remains relatively stationary with the double C-bar structure 10. When the inner frame 14 of the extension mechanism extends to the predetermined position, the spring push rod assembly 3 locks it to prevent retraction. At the same time, the rope 32 is just fully released and taut. The rope 32 pulls the locking hook assembly 7 to rotate and unlock, and the transmission rope 9 is released from the constraint of the locking hook assembly 7. Figure 3As shown, the C-bar front connecting rod 22 then continues to translate in the unfolding direction under the push of the double C-bar structure 10, while the extension mechanism assembly 2, bracket 4, and extension mechanism connecting rod 5 remain in the predetermined position. The double C-bar structure 10 continues to slide and unfold on the bracket 4 until the double C-bar structure 10 is fully unfolded. Figure 2 This is the state where the double C-bar 10 is fully extended.

Claims

1. An extension support device for deploying a C-shaped elastic extension rod, characterized in that, include: The system comprises a base, an extension mechanism assembly, a spring push rod assembly, a bracket, an extension mechanism connecting rod, a C-rod front end connecting assembly, a locking hook assembly, a reel assembly, a transmission rope, and a double C-rod structure. The base has multiple supports for mounting and fixing the extension mechanism assembly and the reel assembly. The extension mechanism assembly adopts an extended configuration. The spring push rod assembly includes a spring push rod base, a spring, a push rod, and a limiting nut; the entire assembly is fixed to the extension mechanism assembly via the spring push rod base. The bracket is installed on the left and right sides of the extension mechanism connecting rod and is bolted to the extension mechanism connecting rod joint, providing extension support during and in the extended state of the double C-rod deployment. The extension mechanism connecting rod is installed on the extension... The front part of the extension mechanism assembly is bolted to the connecting rod joint of the extension mechanism; the C-rod front end connecting assembly includes a C-rod front end connecting rod, a clamping plate, a C-rod front end connecting bracket, and a connecting rod joint, clamping and fixing the clamping plate and the C-rod front end connecting bracket to the front end of the double C-rod structure; the locking hook assembly includes a locking hook, a rotating shaft, a locking hook base, and a torsion spring, and the entire assembly is mounted on the extension mechanism connecting rod through the locking hook base; the reel assembly includes a housing, a coil spring, and a rope, and the entire assembly is fixed to the support of the base through the housing; one end of the transmission rope is connected to the reserved hole in the connecting rod joint, and the other end is initially sleeved on the locking hook, and the double C-rod structure is connected as one unit through the C-rod front end connecting assembly.

2. The extension support device for deploying a C-shaped elastic extension rod according to claim 1, characterized in that, Further includes: The extension mechanism assembly includes an extension mechanism outer frame, an extension mechanism slide rail outer layer, an extension mechanism slide rail inner layer, an extension mechanism inner frame, an extension mechanism root base joint, an extension mechanism front base joint, and an extension rod mechanism connecting rod joint. The entire assembly is fixed to the base through the extension mechanism root base joint and the extension mechanism front base, and is connected to the extension mechanism connecting rod through the extension mechanism connecting rod joint, adopting a drawer-type sliding mechanism.

3. An extension support device for deploying a C-shaped elastic extension rod according to claim 1 or 2, characterized in that, Further includes: Both the outer frame and the inner frame of the extension mechanism are made of carbon fiber square tubing. The inner and outer layers of the extension mechanism slide rails are clamped and fixed to the inner and outer frames of the extension mechanism respectively by bolts and nuts. The inner frame of the extension mechanism unfolds relative to the outer frame of the extension mechanism along the extension direction by the relative sliding between the inner and outer layers of the extension mechanism slide rails.

4. An extension support device for deploying a C-shaped elastic extension rod according to claim 1, characterized in that, Further includes: The push rod is cylindrical, with annular bosses and threads machined at its middle and bottom for mounting a spring and a limiting nut, respectively. The spring is installed inside the spring push rod base, and the annular boss on the push rod pushes the push rod to slide along the inside of the spring push rod base. Under the action of the spring force, the push rod elastically slides into contact with the inner frame of the extension mechanism. When the extension mechanism assembly extends to the predetermined position, the top of the push rod enters the groove on the inner frame of the extension mechanism, locking the inner frame and preventing it from retracting along the outer frame of the extension mechanism. The limiting nut is screwed to the bottom of the push rod to prevent the push rod from popping out of the spring push rod base under the action of the spring force.

5. An extension support device for deploying a C-shaped elastic extension rod according to claim 1 or 2, characterized in that, Further includes: The connecting rod joint has an overall "I" shape structure, and its left and right sides are respectively glued and fixed to the front connecting rods of the two C rods. The middle of the connecting rod joint has a reserved hole for connecting to the transmission rope. The front connecting bracket of the C rod is glued and fixed to the front connecting rods of the two C rods respectively. The clamping plate has a threaded hole and is connected to the front connecting bracket of the C rod by bolts.

6. An extension support device for deploying a C-shaped elastic extension rod according to claim 1, characterized in that, Further includes: The base of the lock hook is provided with a mounting hole for mounting the rotating shaft, and the lock hook is also provided with a corresponding mounting hole; the rotating shaft passes through the mounting holes of the lock hook base and the lock hook, so that the lock hook rotates around the rotating shaft relative to the lock hook base; the torsion spring is sleeved on the rotating shaft, one end of the torsion spring is limited to a groove provided on the lock hook base, and the other end acts on the lock hook to apply an elastic clamping force to the lock hook, so that the lock hook remains pressed downward on the lock hook base in the initial state.

7. An extension support device for deploying a C-shaped elastic extension rod according to claim 1 or 6, characterized in that, Further includes: When the extension mechanism assembly has not extended to the predetermined position, the locking hook remains connected to the transmission rope under the compression of the torsion spring, maintaining the connection between the extension mechanism connecting rod and the front end connecting assembly of the C rod. When the extension mechanism assembly extends to the predetermined position, the rope in the reel assembly is fully released. Under the action of tension, the rope drives the locking hook to overcome the elastic compression force of the torsion spring and rotate around the axis in the opposite direction to the compression direction of the torsion spring. The transmission rope is released from the constraint of the locking hook, realizing the unlocking and separation between the extension mechanism connecting rod and the front end connecting assembly of the C rod.

8. An extension support device for deploying a C-shaped elastic extension rod according to claim 1, characterized in that, Further includes: The coil spring and rope are initially coiled inside the outer shell. One end of the rope is connected to the coil spring, and the other end is tied to the locking hook. During the extension mechanism assembly's unfolding process, before it reaches the predetermined position, the rope overcomes the elastic restoring force of the coil spring under the traction of the locking hook and is gradually released from inside the outer shell. When the extension mechanism assembly reaches the predetermined position, the rope is just fully released and straightened. At this time, the rope pulls the locking hook to rotate and unlock.

9. An extension support device for deploying a C-shaped elastic extension rod according to claim 1, characterized in that, Further includes: During the deployment of the extension mechanism assembly but before it reaches the predetermined position, the transmission rope remains connected under the constraint of the locking hook, and transmits the deployment driving force of the double C-bar structure from the C-bar front end connecting assembly to the extension mechanism connecting rod, driving the extension mechanism assembly to move synchronously with the C-bar front end connecting assembly. When the extension mechanism assembly reaches the predetermined position, the locking hook rotates under the traction of the rope, releasing the constraint on the transmission rope and causing the transmission rope to disengage from the locking hook, thus unlocking and separating the C-bar front end connecting assembly from the extension mechanism connecting rod. Under the action of the deployment driving force of the double C-bar structure, the C-bar front end connecting assembly continues to move in the deployment direction, while the extension mechanism connecting rod, extension mechanism assembly, and bracket remain in the predetermined position, providing support for the transition section of the double C-bar structure.

10. A method of operating the extension support device for deploying a C-shaped elastic strut as described in claim 1, characterized in that: Initially, the entire extension mechanism assembly and the double C-bar structure are in a retracted state. When the double C-bar structure unfolds parallel from the retracted state, the C-bar front connecting rod and the C-bar front connecting rod joint are pushed forward by the C-bar front connecting bracket. At this time, the transmission rope attached to the C-bar front connecting rod joint will drag the locking hook assembly, which is in a locked state, and then pull the extension mechanism connecting rod and the extension mechanism assembly to move in the unfolding direction. The rope in the reel assembly is gradually pulled out from the shell. During this process, the bracket remains relatively stationary with the double C-bar structure. When the inner frame of the extension mechanism extends to the predetermined position, the spring push rod assembly locks it to prevent it from retracting. At the same time, the rope is fully released and taut. The rope pulls the locking hook assembly to rotate and unlock. The transmission rope is released from the constraint of the locking hook assembly. Then, the C-bar front connecting rod continues to move in the unfolding direction under the push of the double C-bar structure, while the extension mechanism assembly, bracket and extension mechanism connecting rod remain in the predetermined position. The double C-bar structure continues to slide and unfold on the bracket until the double C-bar structure is fully unfolded.

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