A high overload resistant electric steering gear rudder surface folding and unfolding mechanism and use method

Abstract

The present disclosure relates to a folding and unfolding mechanism for a high overload-resistant electric steering gear rudder surface and a method for using the folding and unfolding mechanism. The folding and unfolding mechanism is embedded and installed on a steering gear housing, a pin puller and a spring bracket are fixedly connected to the steering gear housing, the spring bracket is located below the rudder shaft, an auxiliary unlocking pin and an auxiliary unlocking spring are installed in a mounting hole of the spring bracket, the rudder surface contacts the auxiliary unlocking pin through a notch of the spring bracket when folded, the rudder surface is hinged on the rudder shaft through a rotating shaft pin, the rudder surface rotates around the rotating shaft pin, an unlocking spring and an unlocking pin are both arranged in the rudder shaft mounting hole, and a step surface of the unlocking pin contacts the end surface of the unlocking spring. The advantages of the present invention are: simple structure, greatly improved unlocking ability of the mechanism, meeting the requirements of the mechanism for unfolding the rudder surface under high wind resistance, and at the same time, by optimizing the spring structure component, it can be ensured that it does not produce plastic deformation for a long time, and the rudder opening energy can be effectively stored for a long time.

Description

Technical Field

[0001] The invention relates to a high overload resistant electric steering gear rudder surface folding and unfolding mechanism and a use method thereof. Background Art

[0002] With the rapid development of science and technology, the new generation of electric servos are required to have the characteristics of small integration, high integration, and high overload resistance. In order to meet the characteristics of the long range of artillery shells, the projectile has a considerable initial velocity when it exits, so the overload level of the projectile launch is generally above 10,000g, requiring the rudder to be effectively locked in the folded state, and after receiving the unlocking command from the onboard computer, it can overcome the large air resistance to achieve reliable deployment of the rudder. Due to the spatial layout restrictions of the servo and the high structural strength required during overload impact, the design of the folding and deployment mechanism of the rudder faces huge challenges.

[0003] The common electric servo rudder surface folding and unfolding mechanism uses a spring to push the rudder surface open and lock it. The unfolding force is small, the steering ability is insufficient, and it cannot overcome the large wind resistance to unfold the rudder surface. Alternatively, the rudder surface is directly pushed open by pyrotechnics. Although it has a large unfolding force, the pyrotechnics are expensive, not conducive to long-term storage, and cannot be tested after assembly. When the rudder surface is folded and locked, the locking mechanism is complicated, occupies a large part of the servo cabin, and cannot meet the requirements of high overload. At the same time, it increases the difficulty of integrating, miniaturizing, and lightweighting the servo design, and cannot meet the requirements of high overload resistance guided ammunition. This brings great difficulties to the design of the folding and unfolding mechanism of the electric servo rudder surface in terms of reducing the structural weight, reducing the volume, and improving the product's resistance to high overload, further increasing the manufacturing cost of the electric servo. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-overload resistant electric steering gear rudder surface folding and unfolding mechanism, which effectively solves the problem of insufficient steering ability.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a folding and unfolding mechanism for the rudder surface of an electric servo with high overload resistance, characterized in that the folding and unfolding mechanism is embedded and installed on the servo housing, and a pin puller and a spring bracket are fixedly connected to the servo housing, and the spring bracket is located below the rudder shaft, and an auxiliary unlocking pin and an auxiliary unlocking spring are installed in the mounting hole of the spring bracket. When the rudder surface is folded, it contacts the auxiliary unlocking pin through the groove of the spring bracket, and the rudder surface is hinged to the rudder shaft through a rotating shaft pin, and the rudder surface rotates around the rotating shaft pin. The unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft, and the step surface of the unlocking pin contacts the end face of the unlocking spring.

[0006] Another object of the present invention is to provide a method for using a high overload resistant electric steering gear control surface folding and unfolding mechanism, characterized in that:

[0007] When folding, the rudder surface rotates around the rotating shaft pin, and the unlocking spring is compressed by pushing the unlocking pin to move in the mounting hole of the rudder shaft; the auxiliary unlocking pin is pushed to compress the auxiliary unlocking spring to move in the mounting hole of the spring bracket. When the locking pin is embedded in the embedded groove at the rear end of the rudder surface, the rudder surface is effectively locked under the action of the unlocking spring and the auxiliary unlocking spring;

[0008] When unfolding, the unlocking spring and the auxiliary unlocking spring push the unlocking pin and the auxiliary unlocking pin forward respectively, driving the rudder surface to rotate counterclockwise and unfold. When the rudder surface is fully unfolded, the rudder shaft restricts the rudder surface from continuing to rotate counterclockwise, and the unlocking pin moves to the position below the rudder surface. At this time, the displacement reaches the maximum value, and the limiting boss on the rudder surface limits the unlocking pin. At the same time, the unlocking pin locks the rudder surface, so that the rudder surface can be reliably unfolded.

[0009] Among them, the folding and unfolding mechanism is embedded and installed on the servo gear housing, and a pin puller and a spring bracket are fixedly connected to the servo gear housing. The spring bracket is located below the rudder shaft, and an auxiliary unlocking pin and an auxiliary unlocking spring are installed in the mounting hole of the spring bracket. When the rudder surface is folded, it contacts the auxiliary unlocking pin through the groove of the spring bracket. The rudder surface is hinged to the rudder shaft through a rotating shaft pin, and the rudder surface rotates around the rotating shaft pin. The unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft, and the step surface of the unlocking pin contacts the end face of the unlocking spring.

[0010] Compared with the prior art, the present invention has the following beneficial technical effects:

[0011] The structure is simple. The folding and unfolding mechanism is embedded and installed on the steering gear housing. A pin puller and a spring bracket are fixedly connected to the steering gear housing. The spring bracket is located below the rudder shaft. The auxiliary unlocking pin and the auxiliary unlocking spring are installed in the mounting hole of the spring bracket. When the rudder surface is folded, the notch of the spring bracket contacts the auxiliary unlocking pin. The rudder surface is hinged on the rudder shaft through the rotating shaft pin. The rudder surface rotates around the rotating shaft pin. The unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft. The step surface of the unlocking pin contacts the end surface of the unlocking spring. The requirements of compact structure and small space occupied by the steering gear are achieved. By integrating the housing, the mechanism installation shell is omitted, the number of parts is reduced, the economy of the mechanism is improved, the cost is saved, the mechanism structure is made compact from the structure, and the high overload resistance of the mechanism is met. By adding the auxiliary unlocking spring, the unlocking ability of the mechanism is greatly improved, and the requirement of the mechanism to unfold the rudder surface under high wind resistance is met. At the same time, by optimizing the spring, it can be ensured that it does not produce plastic deformation for a long time, and the rudder opening energy can be effectively stored for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the folding and unfolding mechanism of the rudder surface of the anti-high overload electric steering gear of the present invention.

[0013] Reference numerals

[0014] 1 - joint, 2 - locking nut, 3 - joint, 4 - connecting rod,

[0015] 5 - pin, 6 - lock pin, 7 - rudder, 8 - baffle,

[0016] 9 - rudder shaft end cover, 10 - shaft pin, 11 - rudder shaft, 12 - unlocking pin,

[0017] 13 - unlocking spring, 14 - auxiliary unlocking pin, 15 - auxiliary unlocking spring,

[0018] 16——pin puller, 17——spring bracket. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below through specific implementation examples, but these implementation examples are only for illustration and do not limit the scope of the present invention.

[0020] Please refer to Figure 1 The folding and unfolding mechanism of the rudder surface of an electric servo motor with high overload resistance of the present invention is characterized in that the folding and unfolding mechanism is embedded and installed on the servo motor housing, a pin puller and a spring bracket are fixedly connected to the servo motor housing, the spring bracket is located below the rudder shaft, an auxiliary unlocking pin and an auxiliary unlocking spring are installed in the mounting hole of the spring bracket, and the rudder surface contacts the auxiliary unlocking pin through the notch of the spring bracket when folded, the rudder surface is hinged on the rudder shaft through a rotating shaft pin, the rudder surface rotates around the rotating shaft pin, the unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft, and the step surface of the unlocking pin contacts the end surface of the unlocking spring. The rudder surface can be unfolded against high wind resistance. The lever principle is used to design the folding and locking mechanism of the rudder surface, which occupies a small space of the servo motor, has a high space utilization rate, requires a small unlocking force of the servo motor, and can meet the requirements of the mechanism for resisting high overload. The whole mechanism is easy to install, which improves the assembly efficiency of the electric steering gear and can carry out multiple rudder folding and unfolding tests. The mechanism has a novel design and a compact structure, which is of positive significance to promoting the miniaturization, combination, structural weight reduction design and high overload resistance of electric steering gears.

[0021] In one embodiment, a clearance groove is provided on the spring bracket, and the rudder surface passes through the clearance groove and contacts the auxiliary unlocking pin.

[0022] In one embodiment, a baffle is fixedly connected to both ends of the notch of the spring bracket.

[0023] In one embodiment, it also includes a rudder shaft end cover, which is fixed on the steering gear housing to provide axial limiting support for the rudder shaft.

[0024] In one embodiment, it further comprises a joint having a U-shaped groove, wherein the joint is fixedly connected to the spindle of the pin puller through a locking nut.

[0025] In one embodiment, it also includes a connecting rod, which is inserted into the U-shaped groove of the joint and connected by a joint.

[0026] In one embodiment, the matching joint is a cylindrical structure that slides in the waist-shaped groove of the connecting rod.

[0027] In one embodiment, a groove is provided at the rear end of the rudder surface.

[0028] As a specific embodiment, the joint 1 and the connecting rod 4 are hinged through the joint 3; the locking pin 6 and the connecting rod 4 are riveted; the joint 1 is fixedly connected to the central shaft of the pin puller 16 through the locking nut 2; the rudder surface 7 and the rudder shaft 11 are hinged through the rotating shaft pin 10; the unlocking pin 12 and the unlocking spring 13 are installed in the mounting hole of the rudder shaft 11; the auxiliary unlocking pin 14 and the auxiliary unlocking spring 15 are installed in the mounting hole of the spring bracket 17.

[0029] In order to realize the folding and locking of the rudder surface, the rudder surface is designed to rotate around the shaft pin 10, and the freedom of the rudder surface 7 in other directions is limited by the notch of the rudder shaft 11 and the shaft pin 10. At the same time, the unlocking spring 13 is compressed by pushing the unlocking pin 12 to move in the mounting hole of the rudder shaft 11; the auxiliary unlocking pin 14 is pushed to compress the auxiliary unlocking spring 15 to move in the mounting hole of the spring bracket 17. When the lock pin 6 is embedded in the groove at the rear end of the rudder surface, the joint is tightened under the action of the unlocking spring 13 and the auxiliary unlocking spring 15, and the rudder surface is effectively locked.

[0030] In order to realize the reliable deployment process of the rudder surface, after receiving the unlocking instruction, the servo activates the pin puller 16, and the pin puller spindle produces an upward displacement, pulling the center of the joint 1 upward, and driving the connecting rod 4 to rotate around the pin shaft 5. When the pin puller spindle displacement reaches a certain position, the lock pin 6 slides out of the notch at the tail end of the rudder surface and disengages from it. Under the action of the stored elastic potential energy, the unlocking spring 13 and the auxiliary unlocking spring 15 push the unlocking pin 12 and the auxiliary unlocking pin 14 forward respectively, forming a torque, driving the rudder surface 7 to rotate counterclockwise and deploy. When the auxiliary unlocking spring 15 is extended to a certain position, the baffle 8 restricts its further movement. The unlocking spring 13 continues to push the rudder surface 7 forward. When the rudder surface 7 is deployed in place, the rudder shaft 11 restricts the rudder surface 7 from continuing to rotate counterclockwise, and the unlocking pin 12 moves to the position below the rudder surface 7. At this time, the displacement reaches the maximum value, and the limiting boss on the rudder surface 7 limits the unlocking pin 12, and the unlocking pin 12 locks the rudder surface 7, so that the rudder surface can be reliably deployed.

[0031] The invention discloses a method for using a folding and unfolding mechanism for a rudder surface of an anti-high overload electric servo engine. When folding, the rudder surface rotates around a rotating shaft pin, and the unlocking spring is compressed by pushing the unlocking pin to move in the mounting hole of the rudder shaft; the auxiliary unlocking pin is pushed to compress the auxiliary unlocking spring and move in the mounting hole of the spring bracket, and when the locking pin is embedded in the embedded groove at the tail end of the rudder surface, the rudder surface is effectively locked under the action of the unlocking spring and the auxiliary unlocking spring; when unfolding, the unlocking spring and the auxiliary unlocking spring respectively push the unlocking pin and the auxiliary unlocking pin to move forward, driving the rudder surface to rotate counterclockwise and unfold, and when the rudder surface is fully unfolded, the rudder shaft limits the rudder surface to continue to rotate counterclockwise, and the unlocking pin moves to a position below the rudder surface, at which time the displacement reaches a maximum value, and the limiting boss on the rudder surface limits the unlocking pin, and at the same time the unlocking pin locks the rudder surface, so that the rudder surface can be reliably unfolded;

[0032] Among them, the folding and unfolding mechanism is embedded and installed on the servo gear housing, and a pin puller and a spring bracket are fixedly connected to the servo gear housing. The spring bracket is located below the rudder shaft, and an auxiliary unlocking pin and an auxiliary unlocking spring are installed in the mounting hole of the spring bracket. When the rudder surface is folded, it contacts the auxiliary unlocking pin through the groove of the spring bracket. The rudder surface is hinged to the rudder shaft through a rotating shaft pin, and the rudder surface rotates around the rotating shaft pin. The unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft, and the step surface of the unlocking pin contacts the end face of the unlocking spring.

[0033] As a specific embodiment, a pin puller and a spring bracket are fixedly connected to the servo housing of the present invention. The spring bracket is located below the rudder shaft. The auxiliary unlocking pin and the auxiliary unlocking spring are installed in the mounting hole of the spring bracket. When the rudder surface is folded, it contacts the auxiliary unlocking pin through the notch of the spring bracket. The rudder surface is hinged on the rudder shaft through the rotating shaft pin. The rudder surface rotates around the rotating shaft pin. The unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft. The step surface of the unlocking pin contacts the end surface of the unlocking spring. The structure is compact, the volume is small, and the functions are complete. The rudder surface folding locking mechanism and the rudder surface unfolding mechanism are well combined, which saves the structural design space, reduces the complexity of the product structure, and realizes the effective folding, locking and unfolding of the rudder surface of the servo under high overload. The structure has high feasibility, reliability and long-term storage, and has a very broad application space and use value in the field of high overload resistant servos.

[0034] As a specific embodiment, a pin puller and a spring bracket are fixedly connected to the steering gear housing of a high overload resistant electric steering gear rudder surface folding and unfolding mechanism of the present invention, the spring bracket is located below the rudder shaft, the auxiliary unlocking pin and the auxiliary unlocking spring are installed in the mounting hole of the spring bracket, and the rudder surface contacts the auxiliary unlocking pin through the notch of the spring bracket when folded, the rudder surface is hinged on the rudder shaft through the rotating shaft pin, the rudder surface rotates around the rotating shaft pin, the unlocking spring and the unlocking pin are both arranged in the rudder shaft mounting hole, and the step surface of the unlocking pin contacts the end surface of the unlocking spring. The steering ability of the mechanism is greatly improved, and the steering gear can reliably unfold and lock the rudder surface under high wind resistance.

[0035] As a specific embodiment, the steering gear housing of the present invention is fixedly connected with a pin puller and a spring bracket, the spring bracket is located below the rudder shaft, the auxiliary unlocking pin and the auxiliary unlocking spring are installed in the mounting hole of the spring bracket, and the rudder surface contacts the auxiliary unlocking pin through the notch of the spring bracket when the rudder surface is folded. The rudder surface is hinged on the rudder shaft through the rotating shaft pin, and the rudder surface rotates around the rotating shaft pin. The unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft, and the step surface of the unlocking pin contacts the end surface of the unlocking spring. The good combination of the rudder surface folding locking mechanism and the rudder surface unfolding mechanism saves structural design space and reduces the complexity of the product structure. By embedded installation with the shell, the design mode of integration and miniaturization of the mechanism and the shell is realized, which solves the problem of high overload resistance of the mechanism and reduces the cost at the same time. It is of great significance in the integrated and high reliability design of the steering gear.

[0036] As a specific embodiment, the present invention has a pin puller and a spring bracket fixedly connected to the steering gear housing, the spring bracket is located below the rudder shaft, the auxiliary unlocking pin and the auxiliary unlocking spring are installed in the mounting hole of the spring bracket, the rudder surface contacts the auxiliary unlocking pin through the notch of the spring bracket when folding, the rudder surface is hinged on the rudder shaft through the rotating shaft pin, the rudder surface rotates around the rotating shaft pin, the unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft, and the step surface of the unlocking pin contacts the end surface of the unlocking spring. The spring provides energy, which is convenient for multiple tests and inspections and can be stored for a long time.

[0037] The steering gear housing of the present invention is fixedly connected with a pin puller and a spring bracket, the spring bracket is located below the rudder shaft, the auxiliary unlocking pin and the auxiliary unlocking spring are installed in the mounting hole of the spring bracket, the rudder surface contacts the auxiliary unlocking pin through the notch of the spring bracket when folded, the rudder surface is hinged on the rudder shaft through the rotating shaft pin, the rudder surface rotates around the rotating shaft pin, the unlocking spring and the unlocking pin are both arranged in the rudder shaft mounting hole, and the step surface of the unlocking pin contacts the end surface of the unlocking spring. The miniaturized and integrated structural design technology is adopted, the mechanism and the housing are integrated, and the embedded installation method is adopted, the structure is compact, the space occupied is small, and the space utilization rate of the steering gear is high.

[0038] As a specific embodiment, the present invention has a pin puller and a spring bracket fixedly connected to the steering gear housing, the spring bracket is located below the rudder shaft, the auxiliary unlocking pin and the auxiliary unlocking spring are installed in the mounting hole of the spring bracket, and the rudder surface contacts the auxiliary unlocking pin through the notch of the spring bracket when folding, the rudder surface is hinged on the rudder shaft through the rotating shaft pin, the rudder surface rotates around the rotating shaft pin, the unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft, and the step surface of the unlocking pin contacts the end surface of the unlocking spring. It has a large steering ability, and the steering energy storage of the mechanism is increased through the unlocking spring and the auxiliary unlocking spring, which can meet the requirements of reliable steering and locking the rudder surface under large wind resistance.

[0039] As a specific embodiment, the present invention has a pin puller and a spring bracket fixedly connected to the steering gear housing, the spring bracket is located below the rudder shaft, the auxiliary unlocking pin and the auxiliary unlocking spring are installed in the mounting hole of the spring bracket, and the rudder surface contacts the auxiliary unlocking pin through the notch of the spring bracket when folded, the rudder surface is hinged on the rudder shaft through the rotating shaft pin, the rudder surface rotates around the rotating shaft pin, the unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft, and the step surface of the unlocking pin contacts the end surface of the unlocking spring. The principle of locking and unfolding the rudder surface is simple, the structure is compact, the number of parts is small, the mechanism is reliable, and it has the ability to resist high overload, which meets the requirements of the guided artillery shells for the structural strength of the mechanism, and at the same time, the manufacturing cost is low, the economy is good, and the low cost and integrated design of the rudder are promoted.

[0040] As a specific embodiment, the steering gear housing of the present invention is fixedly connected with a pin puller and a spring bracket, the spring bracket is located below the rudder shaft, the auxiliary unlocking pin and the auxiliary unlocking spring are installed in the mounting hole of the spring bracket, the rudder surface contacts the auxiliary unlocking pin through the notch of the spring bracket when folding, the rudder surface is hinged on the rudder shaft through the rotating shaft pin, the rudder surface rotates around the rotating shaft pin, the unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft, and the step surface of the unlocking pin contacts the end surface of the unlocking spring. The spring can store the rudder opening energy for a long time, ensuring that the rudder opening force is effective for a long time, and can be tested and disassembled for many times without affecting its performance.

[0041] The present invention achieves the following beneficial technical effects:

[0042] The structure is simple. The folding and unfolding mechanism is embedded and installed on the steering gear housing. A pin puller and a spring bracket are fixedly connected to the steering gear housing. The spring bracket is located below the rudder shaft. The auxiliary unlocking pin and the auxiliary unlocking spring are installed in the mounting hole of the spring bracket. When the rudder surface is folded, the notch of the spring bracket contacts the auxiliary unlocking pin. The rudder surface is hinged on the rudder shaft through the rotating shaft pin. The rudder surface rotates around the rotating shaft pin. The unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft. The step surface of the unlocking pin contacts the end surface of the unlocking spring. The requirements of compact structure and small space occupied by the steering gear are achieved. By integrating the housing, the mechanism installation shell is omitted, the number of parts is reduced, the economy of the mechanism is improved, the cost is saved, the mechanism structure is made compact from the structure, and the high overload resistance of the mechanism is met. By adding the auxiliary unlocking spring, the unlocking ability of the mechanism is greatly improved, and the requirement of the mechanism to unfold the rudder surface under high wind resistance is met. At the same time, by optimizing the spring, it can be ensured that it does not produce plastic deformation for a long time, and the rudder opening energy can be effectively stored for a long time.

[0043] Although the present invention has selected the preferred embodiments disclosed above, it is not intended to limit the present invention. Obviously, it is not necessary and impossible to list all implementation methods here. Any researcher in this field can use the design methods and contents in the above disclosed embodiments to change and modify the research scheme of the present invention without departing from the spirit and scope of the present invention. Therefore, any simple modification, parameter change and modification made to the above embodiments based on the research essence of the present invention without departing from the content of the present invention, all belong to the protection scope of the present invention.

Claims

1. A high overload resistant electric steering gear control surface folding and unfolding mechanism, characterized in that: The folding and unfolding mechanism is embedded and installed on the steering gear housing, and a pin puller and a spring bracket are fixedly connected to the steering gear housing. The spring bracket is located below the rudder shaft, and an auxiliary unlocking pin and an auxiliary unlocking spring are installed in the mounting hole of the spring bracket. When the rudder surface is folded, the rudder surface contacts the auxiliary unlocking pin through the notch of the spring bracket. The rudder surface is hinged to the rudder shaft through the rotating shaft pin, and the rudder surface rotates around the rotating shaft pin. The unlocking spring and the unlocking pin are both arranged in the mounting hole of the rudder shaft, and the step surface of the unlocking pin contacts the end surface of the unlocking spring. The tail end of the rudder surface is provided with an embedding groove; It also includes a joint having a U-shaped groove, wherein the joint is fixedly connected to the spindle of the pin puller through a locking nut; It also includes a connecting rod, which is inserted into the U-shaped groove of the joint and connected by a joint; a locking pin is riveted on the connecting rod; The matching joint is a cylindrical structure, sliding in the waist groove of the connecting rod; A baffle is fixedly connected to both ends of the notch of the spring bracket; When the rudder surface is folded and locked, the rudder surface rotates around the pivot pin, and the freedom of the rudder surface in other directions is limited by the notch on the rudder shaft and the pivot pin; the unlocking spring is compressed by pushing the unlocking pin to move in the mounting hole of the rudder shaft, and the auxiliary unlocking spring is compressed by pushing the auxiliary unlocking pin to move in the mounting hole of the spring bracket; when the locking pin is embedded in the embedded groove at the rear end of the rudder surface, the joint is tightened under the action of the unlocking spring and the auxiliary unlocking spring to complete the effective locking of the rudder surface; When the rudder is deployed, after receiving the unlocking command, the pin puller is activated and the pin puller spindle is displaced upward, pulling the center of the joint upward and driving the connecting rod to rotate around the pin shaft. When the pin puller spindle displacement reaches a certain position, the lock pin slides out of the embedded groove at the tail end of the rudder and disengages from it. Under the action of the stored elastic potential energy, the unlocking spring and the auxiliary unlocking spring push the unlocking pin and the auxiliary unlocking pin forward respectively, forming a torque, driving the rudder surface to rotate counterclockwise and unfold; when the auxiliary unlocking spring is extended to a certain position, the baffle restricts its further movement; The unlocking spring continues to push the rudder surface forward. When the rudder surface is fully deployed, the rudder shaft limits the rudder surface to continue to rotate counterclockwise. The unlocking pin moves to the position below the rudder surface. At this time, the displacement reaches the maximum value. The limiting boss on the rudder surface limits the unlocking pin. At the same time, the unlocking pin locks the rudder surface to complete the deployment of the rudder surface.

2. The high overload resistant electric steering gear control surface folding and unfolding mechanism according to claim 1, characterized in that: A clearance groove is arranged on the spring support, and the rudder surface passes through the clearance groove and contacts with the auxiliary unlocking pin.

3. The high overload resistant electric steering gear control surface folding and unfolding mechanism according to claim 2, characterized in that: It also includes a rudder shaft end cover, which is fixed on the steering gear housing to provide axial limiting support for the rudder shaft.

4. A method for using the high overload resistant electric steering gear control surface folding and unfolding mechanism according to claim 1 or 2, characterized in that: When the rudder surface is folded and locked, the rudder surface rotates around the pivot pin, and the freedom of the rudder surface in other directions is limited by the notch on the rudder shaft and the pivot pin; the unlocking spring is compressed by pushing the unlocking pin to move in the mounting hole of the rudder shaft, and the auxiliary unlocking spring is compressed by pushing the auxiliary unlocking pin to move in the mounting hole of the spring bracket; when the locking pin is embedded in the embedded groove at the rear end of the rudder surface, the joint is tightened under the action of the unlocking spring and the auxiliary unlocking spring to complete the effective locking of the rudder surface; When the rudder is deployed, after receiving the unlocking command, the pin puller is activated and the pin puller spindle is displaced upward, pulling the center of the joint upward and driving the connecting rod to rotate around the pin shaft. When the pin puller spindle displacement reaches a certain position, the lock pin slides out of the embedded groove at the tail end of the rudder and disengages from it. Under the action of the stored elastic potential energy, the unlocking spring and the auxiliary unlocking spring push the unlocking pin and the auxiliary unlocking pin forward respectively, forming a torque, driving the rudder surface to rotate counterclockwise and unfold; when the auxiliary unlocking spring is extended to a certain position, the baffle restricts its further movement; The unlocking spring continues to push the rudder surface forward. When the rudder surface is fully deployed, the rudder shaft limits the rudder surface to continue to rotate counterclockwise. The unlocking pin moves to the position below the rudder surface. At this time, the displacement reaches the maximum value. The limiting boss on the rudder surface limits the unlocking pin. At the same time, the unlocking pin locks the rudder surface to complete the deployment of the rudder surface.

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