A mechanical unlocking device with double redundant locking mechanism

Abstract

The present invention belongs to the technical field of automatic control of aviation life-saving equipment and relates to a mechanical unlocking device with a dual-redundant locking mechanism. The device comprises a sector gear, a brake pad, a transmission gear, a transmission pinion, a transition pinion, a transition gear, a pinion, an adjustment wheel, an adjustment pendulum, a balance wheel, a push rod shaft, a locking rod, a push rod, a transmission block, a lower plate, a brake pad shaft, an adjusting screw, an active lever, a shift lever, a lever, a locking claw, and an upper plate. Compared to conventional unlocking devices, the present invention improves the locking method of a starter pin by adding a push rod and a locking rod to improve the locking method of the balance wheel, making the locking more reliable. Furthermore, the addition of a transmission block and an adjustment slider combination ensures that the locking clearance of the balance wheel is adjustable and reduces wear of the starter pin via a pulley, thereby increasing its service life.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic control of aviation life-saving equipment and relates to a mechanical unlocking device with a double-redundant locking mechanism. Background Art

[0002] Mechanical automatic unlocking devices used in ejection and airborne rescue applications ensure the safety of personnel, equipment, and supplies by delaying the vehicle and sensing altitude, allowing them to descend to a certain height, separating the person from the chair or deploying the parachute. These devices are a crucial component of lifesaving equipment. As the last line of defense, mechanical unlocking devices must offer extremely high mission reliability. For example, the unlocking device used in ejection seats must remain securely locked when in the standby state. Accidental unlocking is strictly prohibited, as it could result in the parachute being deployed, threatening the pilot's life.

[0003] Traditional unlocking devices only have a single redundant locking mechanism, and the transmission system consists of multi-stage gear linkage. Failure of any stage of transmission gear will cause the locking mechanism to fail, causing the unlocking device to accidentally unlock, resulting in casualties and equipment damage.

[0004] A mechanical unlocking device with a dual redundant locking mechanism improves the locking method based on the traditional unlocking device, and adds a locking structure to ensure that when the unlocking device is not started, even if the gear train combination fails, the power output mechanism of the unlocking device can be effectively locked to prevent the unlocking device from accidentally unlocking. Summary of the Invention

[0005] The purpose of the present invention is to provide an unlocking device with a double redundant locking mechanism, which adopts the double locking mechanism to lock the transmission system, thereby improving the reliability and safety of the unlocking device.

[0006] Technical Solution

[0007] A mechanical unlocking device with a dual-redundancy locking mechanism, characterized in that it includes a sector gear 1, a brake pad 2, a transmission gear 3, a transmission pinion 4, a transition pinion 5, a transition gear 6, a pinion 7, an adjustment wheel 8, an adjustment pendulum 9, a balance wheel 10, a push rod shaft 11, a locking rod 12, a push rod 13, a transmission block 14, a lower plate 16, a brake pad shaft 18, an adjusting screw 19, an active lever 20, a shift lever 21, a lever 22, a locking claw 23 and an upper plate 25;

[0008] The sector gear 1 is rotatably connected to the lower plate 16; the sector gear 1 is connected to the brake pad 2, and the brake pad 2 is connected to the unlocking mechanism;

[0009] The sector gear 1 meshes with the transmission pinion 4; the transmission pinion 4 is fixedly connected to the transmission gear 3; the transmission gear 3 meshes with the transition pinion 5; the transition pinion 5 is fixedly connected to the transition gear 6; the transition gear 6 meshes with the pinion 7; the pinion 7 is fixedly connected to the adjustment wheel 8; the adjustment wheel 8 meshes with the adjustment pendulum 9; the adjustment pendulum 9 is fixedly connected to the balance wheel 10;

[0010] One end of the locking rod 12 is rotatably connected to the lower plate 16, and the other end of the locking rod 12 is rotatably connected to one end of the push rod 13 through the push rod shaft 11, and the other end of the push rod 13 is rotatably connected to the transmission block 14; when the unlocking device is in the locked state, the side surface of the locking rod 12 contacts the balance wheel 10, locking the balance wheel 10;

[0011] The sector gear 1 is fixedly connected to the brake pad 2; the brake pad 2 is fixedly connected to the brake pad shaft 18; the brake pad shaft 18 is in contact with the adjusting screw 19; the adjusting screw 19 is fixedly connected to the active lever 20; the active lever 20 is fixedly connected to the shift lever 21; the shift lever 21 is in contact with the lever 22; the lever 22 is rotatably connected to the lower plate 16;

[0012] The push rod shaft 11 contacts the locking claw 23; the locking claw 23 is rotatably connected to the upper plate 25; when the unlocking device is in the locked state, one end of the locking claw 23 contacts the lever 22, locking the lever 22.

[0013] The return spring 17 is mounted on the lower plate 16 and connected to the transmission block 14. When the unlocking device is in the unlocking state, the return spring 17 drives the transmission block 14 to rotate, and the transmission block 14 drives the push rod 13 to swing. The push rod 13 drives the push rod shaft 11 to move. The push rod shaft 11 drives the lock rod 12 to rotate, thereby releasing the lock on the balance wheel 10. The lock pawl tension spring 24 is fixedly connected to the upper plate 25 and connected to the lock pawl 23. When the unlocking device is in the unlocking state, the tension of the lock pawl tension spring 24 and the movement of the push rod shaft 11 drive the lock pawl 23 to rotate, thereby releasing the lock on the lever 22.

[0014] The transmission pinion 4 , the transition gear 6 , the pinion 7 and the balance wheel 10 are all rotatably connected to the lower plate 16 .

[0015] Furthermore, the dual-redundancy unlocking device also includes an adjusting slider 15, which is connected to the transmission block 14; the adjusting slider 15 is connected to the limit member pin; the limit member pin is inserted into the adjusting slider 15, and the limit member cooperates with the adjusting slider 15 to drive the transmission block 14 to rotate, and the unlocking device is in a locked state; after the limit member is pulled out, the reset spring 17 drives the adjusting slider 15 to rotate in the opposite direction, and the unlocking device is in an unlocked state.

[0016] Furthermore, the dual-redundancy unlocking device adopts a locking rod 12 and a push rod 13 structure, and places the insertion position of the limiter latch at the end away from the balance wheel, thereby changing the locking position of the balance wheel.

[0017] Furthermore, the locking rod 12 and the push rod shaft 11 are connected by threads and fastened by flanging and riveting, thereby preventing the connection from loosening while ensuring that the locking rod 12 and the push rod 13 can rotate flexibly.

[0018] Furthermore, the adjustment slider 15 is connected to the waist-shaped hole of the transmission block 14 by bolts, and the position of the adjustment slider 15 on the transmission block 14 can be adjusted to control the locking gap of the balance wheel to ensure effective locking of the mechanism.

[0019] Furthermore, a pulley is installed on the adjustment slider 15 to reduce the friction between the starting pin and the adjustment slider 15, thereby preventing the starting pin from being worn out and failing.

[0020] Furthermore, when the push rod shaft 11 is installed, the verticality with respect to the lower flat plate is ensured to be φ0.05 mm, so as to ensure that the push rod shaft 11 can move flexibly without interference.

[0021] Furthermore, the reset spring 17 is a torsion spring with a wire diameter of 0.8 mm and a preloaded torsion angle of θ = 90°. The torque generated is calculated to be T1 = 116 N·mm. The pawl spring 24 is a tension spring with a wire diameter of 0.4 mm. When the unlocking device is locked, the spring's extended length, l = 5 mm. The tension of the pawl spring 24, converted into a torque applied to the transmission block 14, is T2 = 87.32 N·mm. Therefore, the torque applied to the transmission block 14 is T = T1 + T2 = 203.32 N·mm. When resetting, the reset spring 17 and pawl spring 24 must overcome a torque of 116.85 N·mm caused by the gravity and impact acceleration of the transmission block 14, push rod 13, locking rod 12, and pawl 23. This indicates that the restoring force of the reset spring 17 and pawl spring 24 can meet the reset requirements of the movable block and connecting rod mechanism.

[0022] Technical Effects

[0023] (1) The present invention improves the locking method of the starter pin on the basis of the traditional unlocking device, and improves the locking method of the balance wheel by adding a push rod (13) and a locking rod (12), making the locking more reliable; at the same time, a transmission block (14) and an adjustment slider (15) combination are added, which not only ensures that the locking gap of the balance wheel is adjustable, but also reduces the wear of the starter pin through the pulley, thereby increasing the service life of the starter pin.

[0024] (2) The present invention adds a locking structure on the basis of the traditional unlocking device, and controls the movement of the gear train mechanism by a locking claw (23) connected to the push rod shaft (11), thereby preventing the unlocking device from being accidentally unlocked due to gear train failure, thereby improving the reliability and safety of the unlocking device.

[0025] (3) The present invention has a compact structure, low cost, and reliable control, and can effectively solve the problem of accidental unlocking of the unlocking device, thereby improving product reliability and pilot safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram showing the unlocking device mechanism with the upper plate removed;

[0027] Figure 2 It is a schematic diagram showing the unlocking device mechanism. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the following embodiments. The following are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] The specific implementation of the present invention will be further described below with reference to the accompanying drawings.

[0030] See also Figure 1 and Figure 2 The unlocking device of the present invention comprises a sector gear (1), a brake plate (2), a transmission gear (3), a transmission pinion (4), a transition pinion (5), a transition gear (6), a pinion (7), an adjustment wheel (8), an adjustment swing plate (9), a balance wheel (10), a push rod shaft (11), a lock rod (12), a push rod (13), a transmission block (14), an adjustment slide (15), a lower plate (16), a return spring (17), a brake plate shaft (18), an adjustment screw (19), an active lever (20), a shifting rod (21), a lever (22), a locking claw (23), a locking claw tension spring (24) and an upper plate (25).

[0031] The sector gear (1) is rotatably connected to the lower plate (16); the sector gear (1) is connected to the brake plate (2). When the unlocking device is in a locked state, the brake plate (2) bears the unlocking power of the unlocking device.

[0032] The sector gear (1) is meshed with the transmission pinion gear (4); the transmission pinion gear (4) is fixedly connected to the transmission gear (3); the transmission gear (3) is meshed with the transition pinion gear (5); the transition pinion gear (5) is fixedly connected to the transition gear (6); the transition gear (6) is meshed with the pinion gear (7); the pinion gear (7) is fixedly connected to the adjustment wheel (8); the adjustment wheel (8) is meshed with the adjustment pendulum (9); the adjustment pendulum (9) is fixedly connected to the balance wheel (10). The unlocking power of the unlocking device is transmitted from the sector gear (1) to the balance wheel (10) through the above-mentioned transmission path, driving the balance wheel to swing periodically.

[0033] One end of the locking rod (12) is rotatably connected to the lower plate (16), the other end of the locking rod (12) is rotatably connected to one end of the push rod (13) through the push rod shaft (11), and the other end of the push rod (13) is rotatably connected to the transmission block (14); when the unlocking device is in a locked state, the side surface of the locking rod (12) contacts the balance wheel (10) to lock the balance wheel (10).

[0034] The sector gear (1) is fixedly connected to the brake pad (2); the brake pad (2) is fixedly connected to the brake pad shaft (18); the brake pad shaft (18) is in contact with the adjusting screw (19); the adjusting screw (19) is fixedly connected to the active lever (20); the active lever (20) is fixedly connected to the shifting rod (21); the shifting rod (21) is in contact with the lever (22); and the lever (22) is rotatably connected to the lower plate (16).

[0035] The push rod shaft (11) contacts the locking claw (23); the locking claw (23) is rotatably connected to the upper plate (25); when the unlocking device is in a locked state, one end of the locking claw (23) contacts the lever (22) to lock the lever (22).

[0036] The reset spring (17) is mounted on the lower plate (16) and connected to the transmission block (14); when the unlocking device is in the unlocking state, the reset spring (17) drives the transmission block (14) to rotate, and the transmission block (14) drives the push rod (13) to swing; the push rod (13) drives the push rod shaft (11) to move; the push rod shaft (11) drives the lock rod (12) to rotate, thereby releasing the lock on the balance wheel (10). In order to prevent the lock claw (23) from vibrating or being damaged during the impact process, a lock claw tension spring (24) is added to reduce the impact force on the lock claw (23) and at the same time increase the restoring force of the transmission block (14). The lock claw tension spring (24) is fixedly connected to the upper plate (25) and connected to the lock claw (23); when the unlocking device is in the unlocking state, the tension of the lock claw tension spring (24) and the movement of the push rod shaft (11) drive the lock claw (23) to rotate, thereby releasing the lock on the lever (22).

[0037] The reset spring (17) is a torsion spring with a wire diameter of Φ0.8mm and a pre-tightening torsion angle of θ=90°. The torque generated by the reset spring (17) is calculated to be T1=116N·mm. The lock claw tension spring (24) is a tension spring with a wire diameter of Φ0.4mm. The lifting length l of the tension spring when the unlocking device is locked is 5mm. The tension of the lock claw tension spring (24) is converted into a torque applied to the transmission block (14) of T2=87.32N·mm. Therefore, the torque T applied to the transmission block (14) is T=T1+T2=203.32N·mm. When the reset spring (17) and the lock claw tension spring (24) are reset, the torque caused by the gravity and impact acceleration of the transmission block (14), the push rod (13), the lock rod (12) and the lock claw (23) that need to be overcome is 116.85N·mm. It can be seen that the restoring force of the reset spring (17) and the locking claw tension spring (24) can meet the reset requirements of the movable block and the connecting rod mechanism.

[0038] The transmission pinion (4), the transition gear (6), the pinion (7) and the balance wheel (10) are all rotatably connected to the lower plate (16).

[0039] Furthermore, the dual-redundancy unlocking device further comprises an adjusting slider (15), the adjusting slider (15) being connected to the transmission block (14); the adjusting slider (15) being connected to a limiter latch; the limiter latch being inserted into the adjusting slider (15), the limiter cooperating with the adjusting slider (15), driving the transmission block (14) to rotate, and the unlocking device being in a locked state; after the limiter is pulled out, the reset spring (17) drives the adjusting slider (15) to rotate in the opposite direction, and the unlocking device is in an unlocked state.

[0040] Furthermore, the dual-redundancy unlocking device adopts a locking rod (12) and a push rod (13) structure, and the position where the limiter latch is inserted is placed at an end away from the balance wheel, thereby changing the locking position of the balance wheel.

[0041] Furthermore, the push rod (13) is a slender rod, and the direction of the pressure it receives is the axial direction of the push rod (13); in order to avoid the push rod (13) from yielding and deforming after being compressed, which causes the unlocking device to get stuck, the push rod (13) is made of 2Cr13 (with a strength limit of about 510 MPa). Strength simulation is performed on the push rod (13), and the maximum load and maximum deformation of the weak link of the push rod (13) when it is subjected to the maximum pressure are 322.88 MPa and 1.6×10 -3 mm, according to the simulation results, the structure and material of the push rod (13) can meet the use requirements.

[0042] Furthermore, the transmission block (14) is bolted to the adjustment slider (15), and the appropriate locking gap of the balance wheel can be controlled by adjusting the position of the slider, thereby reducing the tolerance requirements of the parts processing size and improving the installation and debugging efficiency.

[0043] Furthermore, one end of the locking rod (12) is riveted to one end of the push rod (13) through the push rod shaft (11), and the other end of the push rod (13) is riveted to the transmission block (14), so as to ensure the flexibility of relative rotation between the locking rod (12), the push rod (13) and the transmission block (14).

[0044] Furthermore, the push rod shaft (11) is a slender shaft, which serves as the central axis for the rotation of the locking rod (12) and the push rod (13) on one hand; on the other hand, the push rod shaft (11) contacts the locking claw (23) to drive the locking claw (23) to rotate.

[0045] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical terms and scientific terms) have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with that in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein. The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mechanical unlocking device with a double-redundant locking mechanism, characterized in that: It includes a sector gear, a brake pad, a transmission gear, a transmission pinion, a transition pinion, a transition gear, a pinion, an adjustment wheel, an adjustment pendulum, a balance wheel, a push rod shaft, a locking rod, a push rod, a transmission block, a lower plate, a brake pad shaft, an adjusting screw, an active lever, a shift lever, a lever, a locking claw and an upper plate; The sector gear is rotatably connected to the lower plate; the sector gear is connected to the brake pad, and the brake pad is connected to the unlocking mechanism; The sector gear meshes with the transmission pinion; the transmission pinion is fixedly connected to the transmission gear; the transmission gear meshes with the transition pinion; the transition pinion is fixedly connected to the transition gear; the transition gear meshes with the pinion; the pinion is fixedly connected to the adjustment wheel; the adjustment wheel meshes with the adjustment pendulum; the adjustment pendulum is fixedly connected to the balance wheel; One end of the locking rod is rotatably connected to the lower plate, and the other end of the locking rod is rotatably connected to one end of the push rod through the push rod shaft, and the other end of the push rod is rotatably connected to the transmission block; when the unlocking device is in the locked state, the side of the locking rod contacts the balance wheel to lock the balance wheel; The sector gear is fixedly connected to the brake pad; the brake pad is fixedly connected to the brake pad shaft; the brake pad shaft is in contact with the adjusting screw; the adjusting screw is fixedly connected to the active lever; the active lever is fixedly connected to the shifting rod; the shifting rod is in contact with the lever; The lever is rotatably connected to the lower plate; The push rod shaft contacts the locking claw; the locking claw is rotatably connected to the upper plate; When the unlocking device is in the locked state, one end of the locking claw contacts the lever to lock the lever; The reset spring is installed on the lower plate and connected to the transmission block. When the unlocking device is in the unlocking state, the reset spring drives the transmission block to rotate, and the transmission block drives the push rod to swing. The push rod drives the push rod shaft to move. The push rod shaft drives the lock rod to rotate, releasing the lock on the balance wheel. The lock claw tension spring is fixedly connected to the upper plate and connected to the lock claw. When the unlocking device is in the unlocking state, the tension of the lock claw spring and the movement of the push rod shaft drive the lock claw to rotate, releasing the lock on the lever; The transmission pinion, the transition gear, the pinion and the balance wheel are all rotatably connected to the lower plate.

2. A mechanical unlocking device with a dual-redundant locking mechanism according to claim 1, characterized in that: The unlocking device also includes an adjusting slider, which is connected to the transmission block; the adjusting slider is connected to a limit member pin; the limit member pin is inserted into the adjusting slider, and the limit member cooperates with the adjusting slider to drive the transmission block to rotate, and the unlocking device is in a locked state; after the limit member is pulled out, the reset spring drives the adjusting slider to rotate in the opposite direction, and the unlocking device is in an unlocked state.

3. The mechanical unlocking device with dual redundant locking mechanism according to claim 1, characterized in that: The unlocking device adopts a locking rod and a push rod structure, and the insertion position of the limiter latch is placed at an end away from the balance wheel, thereby changing the locking position of the balance wheel.

4. A mechanical unlocking device with a dual-redundant locking mechanism according to claim 1, characterized in that: The locking rod and the push rod shaft are connected by threads and fastened by flanging and riveting, which prevents the connection from loosening while ensuring that the locking rod and the push rod can rotate flexibly.

5. A mechanical unlocking device with a dual-redundant locking mechanism according to claim 2, characterized in that: The adjusting slide block is connected to the waist-shaped hole of the transmission block by bolts, and the position of the adjusting slide block on the transmission block can be adjusted to control the locking gap of the balance wheel.

6. A mechanical unlocking device with a dual-redundant locking mechanism according to claim 5, characterized in that: A pulley is installed on the adjusting slider to reduce the friction between the starting pin and the adjusting slider.

7. The mechanical unlocking device with dual redundant locking mechanism according to claim 1, characterized in that: When the push rod shaft is installed, the verticality with the lower flat plate is ensured to be φ0.05mm, ensuring that the push rod shaft moves flexibly without interference.

8. The mechanical unlocking device with dual redundant locking mechanism according to claim 1, characterized in that: The reset spring adopts a torsion spring with a wire diameter of Φ0.8mm and a pre-tightening torsion angle of θ=90°; the lock claw tension spring adopts a tension spring with a wire diameter of Φ0.4mm.

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