Automatic locking structure with unlocking keeping function

Abstract

The invention belongs to the technical field of machinery, and relates to a lock structure with an unlocking keeping function and an automatic locking function. Comprising a limiting seat, a trigger pin, an unlocking retaining spring seat, an unlocking spring, an unlocking pin, a locking ring, a locking spring, a lock sleeve, a lock pin, a piston rod and a barrel. The locking ring is sleeved at the tail end of the piston rod and forms a two-section type supporting rod structure with the cylinder body; a U-shaped groove is formed in the outer circle of the cylinder, two-section holes with different sectional areas are machined in one end of the U-shaped groove, and a limiting seat and a trigger pin are installed in the U-shaped groove. The lock sleeve and the locking spring are sleeved on the outer circular surface of the cylinder body, an unlocking retaining spring seat is arranged at the boss end of the lock sleeve, and the unlocking pin and the unlocking spring are inserted into a guide hole of the unlocking retaining spring seat in a matched manner; and when the piston rod is completely retracted, the three lock pins are embedded into a space formed by the lock sleeve, the cylinder body and the piston rod. The lock structure can be automatically locked, has an unlocking keeping function, and has the advantages of reducing system complexity, being high in locking / unlocking reliability, preventing clamping stagnation and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of machinery, and relates to a lock structure, in particular to an automatic lock structure with an unlocking holding function. BACKGROUND

[0002] When maintaining the engine of a ground vehicle, an energy device drives an actuator to open a reverse thrust cowl or a fan cover. In order to prevent accidents caused by the accidental closing of the reverse thrust cowl or the fan cover due to the failure of the actuator, an auxiliary support structure needs to be designed for insurance. The support rod structure needs to be able to maintain locking at a specific length and can be unlocked and retracted.

[0003] At present, the technical solutions that can achieve the above functions in China include a hydraulic lock solution, an electromagnetic locking / unlocking solution and a pure mechanical lock solution. However, the hydraulic lock structure has the risk of high design cost and oil leakage, the electromagnetic lock structure has poor stability, and the pure mechanical lock structure has no above-mentioned defects, but the current related design system has high complexity and low stability and reliability. SUMMARY

[0004] The present application belongs to the technical field of machinery, and relates to a lock structure, in particular to an automatic lock structure with an unlocking holding function.

[0005] The technical solution of the present application is as follows: in order to achieve the above-mentioned application purpose, the present application designs an automatic lock structure with an unlocking holding function, which comprises a limiting seat, a trigger pin, an unlocking holding spring seat, an unlocking spring, an unlocking pin, a locking ring, a locking spring, a lock sleeve, a lock pin, a piston rod and a cylinder body. The locking ring is sleeved on the end of the piston rod, and the cylinder body forms a two-section support rod structure. The outer circle of the cylinder body is provided with a U-shaped groove, one end of the U-shaped groove is machined into a two-section unequal cross-section hole, and the inside is provided with the limiting seat and the trigger pin. The lock sleeve and the locking spring are sleeved on the outer circular surface of the cylinder body, the lock sleeve is provided with the unlocking holding spring seat on the convex end, the unlocking pin and the unlocking spring are inserted into the guide hole of the unlocking holding spring seat in cooperation. In the fully retracted state of the piston rod, the three lock pins are embedded into the space formed by the lock sleeve, the cylinder body and the piston rod.

[0006] Further, before the piston rod reaches the locking position, the lock pin is surrounded by the lock sleeve groove surface, the cylinder body outer circular through hole and the piston rod outer circle. At this time, the piston rod can be freely elongated and retracted.

[0007] Furthermore, when the piston rod continues to extend to the locked position, the preload of the locking spring drives the locking sleeve to move, which in turn pushes the locking pin into the annular groove of the locking ring on the piston rod by the boss with the inclined surface feature inside the locking sleeve, until the unlocking retaining spring seat installed on the locking sleeve interferes with the U-shaped groove of the cylinder. At this time, the locking pin is covered by the boss inside the locking sleeve, and the locking ring on the piston rod interferes with the volume of the locking pin below the through hole of the cylinder, so that the piston rod cannot continue to retract, thus realizing the locking function.

[0008] Furthermore, during unlocking, an external operating force overcomes the locking spring's elasticity to drive the lock sleeve to move until the unlocking retaining spring seat moves to the appropriate position for the limiting seat at the U-shaped groove of the cylinder. Under the action of the unlocking spring, the unlocking pin is inserted into the guide hole of the limiting seat and contacts the trigger pin. The guide hole of the limiting seat restricts the axial movement of the unlocking pin, thus achieving the unlocking retaining function. At this time, the upper surface of the locking pin is not covered by the built-in boss of the lock sleeve, and the inclined surface of the annular groove of the locking ring on the piston rod can push the locking pin radially towards the cylinder during the retraction process without interfering with the locking ring, thus achieving the unlocking function.

[0009] Furthermore, when the piston rod retracts after unlocking, the chamfered groove of the locking ring pushes the locking pin cylinder radially out, causing the locking pin to be surrounded again by the grooved surface of the lock sleeve, the outer through hole of the cylinder, and the outer circle of the piston rod. As the piston rod continues to retract, the chamfered end of the locking ring pushes the trigger pin upward, thereby causing the unlocking pin to move upward until the unlocking pin slides out of the limit seat under the action of the locking spring, causing the internal boss of the lock sleeve to press the locking pin again, ready for the next locking.

[0010] Furthermore, the locking pin has a saddle-shaped structure, which cooperates with the locking ring groove and the piston rod. The contact surfaces used to drive the locking pin are all provided with guide slopes, which can allow the locking pin to move smoothly and play an anti-jamming function.

[0011] Furthermore, there are three locking pins, the same number as the number of through holes on the outer cylinder, and they are evenly distributed circumferentially.

[0012] Furthermore, the trigger pin structure is a three-section cylinder with unequal cross-sectional areas. The upper two cylindrical sections mate with the two unequal cross-sectional area holes of the limiting seat to limit the movement of the trigger pin. The lowermost cylindrical section mates with the U-shaped groove through hole in the cylinder body, serving as a guide.

[0013] Furthermore, the area of ​​the hole at the upper end of the limit seat is larger than the area of ​​the unlocking pin, so as to ensure that when the lock sleeve is pulled, the unlocking pin can be smoothly driven into the limit seat and contact the trigger pin.

[0014] Furthermore, the unlocking retaining spring seat is connected to the locking sleeve via threads, and the smooth cylinder at the lower end of the thread engages with the U-shaped groove of the cylinder to limit the range of movement of the locking sleeve.

[0015] Furthermore, both the locking ring and the trigger pin contact surfaces are provided with guide slopes, which can effectively prevent movement jamming.

[0016] The advantages of this invention are: the lock structure of this invention, which can automatically lock and has an unlocking and holding function, is a technical solution for mechanical automatic locking, unlocking and holding, and automatic restoration to the lockable state. It has the advantages of reducing system complexity, simplifying system technical solution, high locking / unlocking reliability, and preventing jamming. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the locking structure of the present invention; Figure 2 This is a schematic diagram of the locking structure of the present invention; Among them, 1-limit seat, 2-trigger pin, 3-unlocking retaining spring seat, 4-unlocking spring, 5-unlocking pin, 6-locking ring, 7-locking spring, 8-lock sleeve, 9-locking pin, 10-piston rod, 11-cylinder. Detailed Implementation

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings or specific implementation examples. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described, and these examples should not be construed as limited to the examples set forth herein. Rather, these examples are described to better demonstrate the positive effects of the present invention, and all aspects not detailed herein are considered to be well-known or conventional techniques in the art.

[0019] like Figure 1 and Figure 2 As shown, the present invention specifically designs a follower strut structure that can automatically lock and has an unlocking and retaining function, including a limiting seat 1, a trigger pin 2, an unlocking and retaining spring seat 3, an unlocking spring 4, an unlocking pin 5, a locking ring 6, a locking spring 7, a locking sleeve 8, a locking pin 9, a piston rod 10, and a cylinder 11. The locking ring 6 is fitted onto the end of the piston rod 10, forming a conventional two-section strut structure with the cylinder 11. The outer circumference of the cylinder 11 is provided with a U-shaped groove, one end of which is machined into a two-section unequal cross-sectional area hole, inside which the limiting seat 1 and the trigger pin 2 are installed. The locking sleeve 8 and the locking spring 7 are fitted onto the outer circumference of the cylinder 11. The locking sleeve 8 has an unlocking and retaining spring seat 3 mounted on its boss end. The unlocking pin 5 and the unlocking spring 4 are inserted into the guide hole of the unlocking and retaining spring seat 3. When the piston rod 10 is fully retracted, the three locking pins 9 are embedded in the space formed by the locking sleeve 8, the cylinder 11, and the piston rod 10.

[0020] Before the piston rod 10 reaches the locked position, the locking pin 9 is surrounded by the groove surface of the locking sleeve 8, the outer diameter through hole of the cylinder 11, and the outer diameter of the piston rod 10. At this time, the piston rod 10 can freely extend and retract.

[0021] When the piston rod 10 continues to extend to the locked position, the preload of the locking spring 7 drives the locking sleeve 8 to move, which in turn pushes the locking pin 9 into the annular groove of the locking ring 6 on the piston rod 10 by the protrusion with the inclined surface feature inside the locking sleeve 8, until the unlocking retaining spring seat 3 installed on the locking sleeve 8 interferes with the U-shaped groove of the cylinder 11. At this time, the locking pin 9 is covered by the protrusion inside the locking sleeve 8, and the locking ring 6 on the piston rod 10 and the locking pin 9 interfere with the volume of the part of the cylinder 11 that is lower than the through hole, so that the piston rod 10 cannot continue to retract, thus realizing the locking function.

[0022] During unlocking, an external operating force overcomes the elasticity of the locking spring 7, driving the locking sleeve 8 to move until the unlocking holding spring seat 3 moves to the appropriate position for the installation limit seat 1 at the U-shaped groove of the cylinder 11. Under the action of the unlocking spring 4, the unlocking pin 5 is inserted into the guide hole of the limit seat 1 and contacts the trigger pin 2. The guide hole of the limit seat 1 restricts the axial movement of the unlocking pin 5, thus realizing the unlocking holding function. At this time, the upper surface of the locking pin 9 is not covered by the built-in boss of the locking sleeve 8. During the retraction process, the inclined surface of the annular groove of the locking ring 6 on the piston rod 10 can push the locking pin 9 radially towards the cylinder 11 without interfering with the locking ring 6, thus realizing the unlocking function.

[0023] When the piston rod 10 is unlocked and retracted, the chamfered groove of the locking ring 6 pushes the locking pin 9 radially toward the cylinder 11, so that the locking pin 9 is once again surrounded by the grooved surface of the lock sleeve 8, the outer through hole of the cylinder 11, and the outer circle of the piston rod 10. As the piston rod 10 continues to retract, the chamfered end of the locking ring 6 pushes the trigger pin 2 upward, thereby driving the unlocking pin 5 upward until the unlocking pin 5 slides out of the limit seat 1 under the action of the locking spring 7, so that the internal boss of the lock sleeve 8 presses the locking pin 9 again, ready for the next locking.

[0024] The locking pin 9 has a saddle-shaped structure and cooperates with the locking ring 6 and the piston rod 10. The contact surfaces used to drive the locking pin 9 are all provided with guide slopes, which can allow the locking pin 9 to move smoothly and play an anti-jamming function.

[0025] There are three locking pins 9, the same number as the number of through holes on the outer circle of the cylinder 11, which are evenly distributed along the circumference.

[0026] The trigger pin 2 is a three-section cylinder with unequal cross-sectional areas. The upper two sections of the cylinder mate with the two unequal cross-sectional area holes of the limiting seat 1 to limit the travel of the trigger pin 2. The lowermost cylinder mates with the U-shaped groove through hole of the cylinder 11 and serves as a guide.

[0027] The area of ​​the upper hole of the limit seat 1 is larger than the area of ​​the unlocking pin 5, so as to ensure that when the lock sleeve 8 is pulled, the unlocking pin 5 can be smoothly driven into the limit seat 1 and contact the trigger pin 2.

[0028] The unlocking retaining spring seat 3 is connected to the locking sleeve 8 by threads. The smooth cylinder at the lower end of the thread engages with the U-shaped groove of the cylinder 11 to limit the movement range of the locking sleeve 8.

[0029] Both the locking ring 6 and the trigger pin 2 have guide slopes on their contact surfaces, which can effectively prevent movement from getting stuck.

[0030] The above specific embodiments or examples are only used to explain the technical solutions of the present invention and are not intended to limit the present application. Parts not described in detail are considered to be conventional technical means or common knowledge in the field. It can be understood by those skilled in the art that, based on the design concept of the present application, the technical solutions described in the foregoing embodiments can be adapted or some or all of the technical features can be equivalently replaced. These modifications, equivalent replacements, and adaptive improvements do not depart from the technical essence of the present invention and should all be covered within the protection scope of the present application.

Claims

1. An automatic locking structure with unlocking and retaining function, characterized in that, It includes a limit seat (1), a trigger pin (2), an unlocking retaining spring seat (3), an unlocking spring (4), an unlocking pin (5), a locking ring (6), a locking spring (7), a locking sleeve (8), a locking pin (9), a piston rod (10), and a cylinder (11); the locking ring (6) is fitted onto the end of the piston rod (10), and together with the cylinder (11), forms a conventional two-section support rod structure; the outer circumference of the cylinder (11) is provided with a U-shaped groove, and one end of the U-shaped groove is machined with a two-section unequal cross-sectional area hole. An internal limit seat (1) and trigger pin (2) are installed; a lock sleeve (8) and a locking spring (7) are fitted on the outer circumference of the cylinder (11); an unlocking retaining spring seat (3) is installed on the boss end of the lock sleeve (8); an unlocking pin (5) and an unlocking spring (4) are inserted into the guide hole of the unlocking retaining spring seat (3); when the piston rod (10) is fully retracted, three locking pins (9) are embedded in the space formed by the lock sleeve (8), the cylinder (11) and the piston rod (10); When the piston rod (10) continues to extend to the locked position, the preload of the locking spring (7) drives the locking sleeve (8) to move, which in turn pushes the locking pin (9) into the annular groove of the locking ring (6) on the piston rod (10) by the boss with the inclined surface inside the locking sleeve (8) until the unlocking retaining spring seat (3) installed on the locking sleeve (8) interferes with the U-shaped groove of the cylinder (11). At this time, the locking pin (9) is covered by the boss inside the locking sleeve (8), and the locking ring (6) on the piston rod (10) and the locking pin (9) interfere with the volume of the part of the cylinder (11) that is lower than the through hole, so that the piston rod (10) cannot continue to retract, thus realizing the locking function; When unlocking, the locking sleeve (8) is driven to move by the external operating force to overcome the elastic force of the locking spring (7) until the unlocking holding spring seat (3) moves to the appropriate position of the limit seat (1) at the U-shaped groove of the cylinder (11). The unlocking pin (5) is inserted into the guide hole of the limit seat (1) under the action of the unlocking spring (4) and contacts the trigger pin (2). The guide hole of the limit seat (1) restricts the axial movement of the unlocking pin (5) and realizes the unlocking holding function. At this time, the upper surface of the locking pin (9) is not covered by the built-in boss of the locking sleeve (8). The inclined surface of the ring groove of the locking ring (6) on the piston rod (10) can push the locking pin (9) radially towards the cylinder (11) during the retraction process, without interfering with the locking ring (6) and realizing the unlocking function.

2. The automatic locking structure with unlocking and retaining function as described in claim 1, characterized in that, When the piston rod (10) is unlocked and retracted, the chamfer of the groove of the locking ring (6) pushes the locking pin (9) radially toward the cylinder (11), so that the locking pin (9) is once again surrounded by the groove surface of the lock sleeve (8), the outer through hole of the cylinder (11) and the outer circle of the piston rod (10); the piston rod (10) continues to retract, and the chamfer at the end of the locking ring (6) pushes the trigger pin (2) to move upward, thereby driving the unlocking pin (5) to move upward until the unlocking pin (5) slides out of the limit seat (1) under the action of the locking spring (7), so that the inner boss of the lock sleeve (8) presses the locking pin (9) again, ready for the next locking.

3. The automatic locking structure with unlocking retention function as described in claim 2, characterized in that, Before the piston rod (10) reaches the locked position, the locking pin (9) is surrounded by the groove surface of the locking sleeve (8), the outer through hole of the cylinder (11) and the outer circle of the piston rod (10). At this time, the piston rod (10) can freely extend and retract.

4. The automatic locking structure with unlocking and retaining function as described in claim 3, characterized in that, The locking pin (9) has a saddle-shaped structure and works with the locking ring (6) groove and piston rod (10). The contact surfaces used to drive the locking pin (9) are all provided with guide slopes, which can allow the locking pin (9) to move smoothly and play a role in preventing jamming.

5. The automatic locking structure with unlocking retention function as described in claim 4, characterized in that, There are three locking pins (9), the same number as the number of through holes on the outer circle of the cylinder (11), and they are evenly distributed along the circumference.

6. The automatic locking structure with unlocking retention function as described in claim 1, characterized in that, The trigger pin (2) has a three-section cylindrical body with unequal cross-sectional area. The two upper cylindrical sections cooperate with the two unequal cross-sectional area holes of the limiting seat (1) to limit the movement stroke of the trigger pin (2). The lowermost cylindrical section cooperates with the U-shaped groove through hole of the cylinder (11) to serve as a guide.

7. The automatic locking structure with unlocking and retaining function as described in claim 6, characterized in that, The area of ​​the upper hole of the limit seat (1) is larger than the area of ​​the unlocking pin (5) so as to ensure that when the lock sleeve (8) is pulled, the unlocking pin (5) can be smoothly inserted into the limit seat (1) and contact the trigger pin (2).

8. The automatic locking structure with unlocking retention function as described in claim 1, characterized in that, The unlocking retaining spring seat (3) is connected to the locking sleeve (8) by a thread. The smooth cylinder at the lower end of the thread engages with the U-shaped groove of the cylinder (11) to limit the movement range of the locking sleeve (8).

9. An automatic locking structure with unlocking and retaining function as described in claim 1, characterized in that, The contact surfaces of the locking ring (6) and the trigger pin (2) are both provided with guide slopes to effectively prevent movement jamming.

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