Restraint releasing actuator

Abstract

The utility model relates to a constraint relieving actuator, which comprises a shell, a screw cap I, a firing pin, a blocking ring, a large piston rod, a screw cap III and a small piston rod, an energy bomb mounting cavity is arranged at the lower part of the shell, a mounting cavity and a gas channel are arranged at the upper part of the shell, the large piston rod is axially mounted in the large piston rod cavity, and the small piston rod is axially mounted in the gas channel. A groove is formed in the position, at the containing cavity of the large piston rod, of the shell, a lightening hole is formed in the head of the thick end of the large piston rod, a threaded hole is formed in the tail end of a thin rod, an annular groove is formed in the joint of the thin rod and the thick end, and the thin rod penetrates through the upper cavity to be connected with the blocking ring. The small piston rod is vertically installed in the fuel gas channel, one end of the small piston rod is fixed and limited through a third screw cap, the other end of the small piston rod is inserted into the annular groove, the large piston rod moves towards the portion with the larger sectional area after constraint of the small piston rod on the large piston rod is relieved under the fuel gas effect, and the connecting belt hung at the thin end falls off and constraint is relieved.

Description

Technical Field

[0001] This utility model belongs to the field of aviation lifesaving and relates to an actuator for releasing the restraints of the life-saving pack connecting strap. Background Technology

[0002] Traditional methods for releasing the constraints of the connecting straps typically involve cutting the connecting ropes attached to the straps with a cutter. However, when cutting the connecting ropes, there is a possibility of wire getting caught, increasing the probability that the connecting ropes cannot be cut as required, thus reducing the reliability of subsequent release of the constraints of the life pack's connecting straps. Furthermore, due to the shape limitations and working principle of the cutter, a dedicated shell needs to be designed within the life pack system for fixing the cutter, and the connecting ropes need to be designed for easy cutting. This reduces the overall operability of the life pack system. Utility Model Content

[0003] The purpose of this invention is to provide a restraint release actuator that can release the restraints of the ejection seat and the life pack connecting straps.

[0004] The technical solution adopted by this utility model is as follows: A constraint release actuator includes a housing, a screw cap, a striking pin, a blocking ring, a large piston rod, a screw cap, and a small piston rod. The housing is characterized by having a mounting cavity for an energy projectile at its lower part, and mounting cavities for the large and small piston rods and a gas passage at its upper part. The large piston rod is axially mounted in the large piston rod cavity, with one end threadedly connected to the screw cap and the other end connected to the blocking ring to restrict the stroke of the large piston rod. The housing has a groove in the large piston rod cavity. The large piston rod has a lightening hole at its thick end and a threaded hole at its thin end. The junction of the thin rod and the thick end is an annular groove. The thin rod passes through the upper cavity and connects to the blocking ring. The small piston rod is vertically mounted in the gas passage, with one end fixed by the screw cap to restrict its stroke, and the other end inserted into the annular groove to constrain the large piston rod in its initial position. After the constraint of the small piston rod on the large piston rod is released under the action of the gas, the large piston rod moves towards the part with a larger cross-sectional area, causing the connecting band hanging on the thin end to detach and release the constraint.

[0005] In a preferred embodiment, the mounting cavity is composed of a first loading cavity, a second loading cavity, a third loading cavity, a large piston rod cavity, and a gas passage that are interconnected with each other. There are three energy bullets, which are respectively installed in the first loading cavity, the second loading cavity, and the third loading cavity. An energy bullet stop step surface is provided at the end of the first loading cavity, and a screw plug is provided at the end of the third loading cavity to fix the energy bullet without affecting the gas output passage of the energy bullet, so that the gas generated by the energy bullet flows through the second loading cavity, through the gas passage, and into the large piston rod cavity.

[0006] In a preferred embodiment, the housing is provided with a firing pin cavity, and the firing pin and a right-handed spring that provides energy for its movement are installed in the firing pin cavity. The tail is screwed to a screw cap to restrict the movement of the firing pin and the spring. Under the action of external force, the firing pin impacts the energy bullet to generate gas and start the firing pin.

[0007] In a preferred embodiment, the firing pin has a multi-step structure, with its end fixedly connected by a screw cap, and the guide portion has a through groove for ventilation.

[0008] In a preferred embodiment, the screw cap has a stepped groove structure, with a central hole for discharging gas from the rear of the piston rod cavity during piston rod movement, and an internal hexagonal structure at the opening.

[0009] In a preferred embodiment, the screw cap has a central hole, the diameter of which is determined by the diameter of the firing pin rod, and the head has an external hexagonal structure.

[0010] In a preferred embodiment, the constraint release actuator further includes a pull pin, which is equipped with a pulley, the pulley being a cylindrical roller with a through hole in the middle. The pull pin is provided with a three-jaw structure to increase stability and smoothness during pull-out, and has a round hole at each end.

[0011] In a preferred embodiment, the tail of the small piston rod is provided with a slotted groove, a threaded hole and a shear pin hole. When not in operation, the small piston rod is fixed in the initial position by the friction of the sealing ring and the limitation of the shear pin, thereby locking the large piston rod in the initial position connected to the connecting rope.

[0012] In a preferred embodiment, the rivet is a flat conical head structure that ensures the striker rod can smoothly pass through the two center holes of the screw cap after riveting.

[0013] In a preferred embodiment, the shear pin is a circular copper wire that restricts the small piston rod to its initial position; the screw cap has a central hole with a diameter determined by the diameter of the small piston rod; the small hole allows the small piston rod to move upward smoothly while preventing it from flying out after movement; the screw cap has an external hexagonal structure for easy installation.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: the actuator has a regular shape and can be directly installed on the life-saving box lid; at the same time, the actuating piston rod can directly pass through the connecting belt without the need for additional adapters, reducing the complexity of the system and improving operability. Furthermore, the actuator utilizes the movement of the piston rod into the housing to release the constraint of the connecting belt, thus improving the reliability of the system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the constraint release actuator of this utility model;

[0016] Figure 2 This is a cross-sectional view of the casing of this utility model;

[0017] Figure 3 This is a schematic diagram of the working process of the small piston rod of this utility model;

[0018] Figure 4 This is a schematic diagram of the working process of the large piston rod of this utility model.

[0019] The markings in the diagram are: 1 - housing, 2 - screw cap one, 3 - firing pin, 4 - spring, 5 - screw cap two, 6 - pull pin, 7 - pulley, 8 - rivet, 9 - screw plug, 10 - plugging ring, 11 - large piston rod, 12 - shear pin, 13 - screw cap three, 14 - small piston rod, 15 - sealing ring, 1a - firing pin cavity, 1b - stepped surface, 1c - first loading cavity, 1d - second loading cavity, 1e - third loading cavity, 1f - gas passage, 1g - large piston rod cavity. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] Reference Figure 1 , 2 An actuator for releasing the restraints of the life-saving pack connecting straps includes a housing 1, a screw cap 1 2, a striking pin 3, a spring 4, a screw cap 2 5, a pull pin 6, a pulley 7, a rivet 8, a screw plug 9, a plugging ring 10, a large piston rod 11, a shearing pin 12, a screw cap 3 13, a small piston rod 14, and a sealing ring 15.

[0022] The housing 1 is secured to the life-saving box lid with bolts via three external lugs. The firing pin cavity 1a houses the firing pin 3 and spring 4, with its tail threaded into a screw cap 2 5 to restrict the movement of the firing pin 3 and spring 4. The first loading cavity 1c, the second loading cavity 1d, and the third loading cavity 1e constitute the energy projectile's mounting cavity, with the stepped surface 1b serving as the energy projectile's mounting stop plane. The gas generated by the energy projectile passes through the second loading cavity 1d, then flows through the gas passage 1f, and enters the large piston rod cavity 1g. The upper large piston rod cavity 1g houses the large piston rod 11 and the small piston rod 14, which are respectively threaded into screw caps 2 and 3 13, restricting the stroke of the large piston rod 11 and the small piston rod 14. The three main cavities inside the housing are interconnected.

[0023] The screw cap 2 has a stepped groove structure, with a small hole in the center for discharging gas from the rear of the piston rod cavity 1g when the piston rod 11 moves, and the opening has an internal hexagonal structure.

[0024] The firing pin 3 has a multi-step structure, and the guide part has a through groove for ventilation.

[0025] The spring 4 is a right-handed spring, which provides energy for the movement of the firing pin 3.

[0026] The screw cap 25 has a hole in the center, the diameter of which is determined by the diameter of the firing pin rod, and the head has an external hexagonal structure.

[0027] The pull pin 6 has a three-claw structure, which can increase the stability and smoothness of pulling out, and there is a round hole at both the head and the tail.

[0028] The pulley 7 is a cylindrical roller with a through hole in the middle, which is used to reduce friction and improve the smoothness of pulling out the pin 6.

[0029] The rivet 8 has a flat conical head structure, which ensures that the striking pin rod can pass smoothly through the center hole of the screw cap 2 5 after riveting.

[0030] The head of the screw plug 9 has an external thread and an internal hexagonal structure, and the tail has four claws and a lightening hole. This structure can fix the energy bomb without affecting the passage of the energy bomb's output gas.

[0031] The blocking ring 10 has an annular structure, with a slot on one end face and a mounting and positioning plane for the large piston rod 11 on the other end face.

[0032] The large piston rod 11 has a relief hole at its thick end and a threaded hole at its thin end. The junction of the thin rod and the thick end is an annular groove. Under the action of the combustion gas, the large piston rod 11 moves towards the larger cross-sectional area, i.e., into the housing, causing the connecting strap hanging on the thin end to detach and the constraint to be released.

[0033] The shear pin 12 is a circular copper wire that restricts the small piston rod 14 to its initial position.

[0034] The screw cap 13 has a central hole, the diameter of which is determined by the diameter of the small piston rod 14. The small hole allows the small piston rod 14 to move upward smoothly while preventing it from flying out after movement. The screw cap 13 has an external hexagonal structure for easy installation.

[0035] The small piston rod 14 has a slotted groove, a threaded hole, and a shear pin hole at its tail. In the non-working state, the small piston rod 14 is fixed in the initial position by the friction of the sealing ring and the constraint of the shear pin, thereby locking the large piston rod 11 in the initial position and making it reliably connected to the connecting rope. In operation, under the action of gas, since the small piston rod 14 is much lighter than the large piston rod 11, the small piston rod 14 moves upward first, releasing the lock of the large piston rod 11, so that the large piston rod 11 can move.

[0036] The above technical solutions are merely preferred embodiments of this utility model and should not be construed as limiting the scope of this utility model. Therefore, any equivalent changes made in accordance with the scope of this utility model patent shall still fall within the protection scope of this utility model.

Claims

1. A constraint release actuator, comprising a housing (1), a screw cap (2), a striking pin (3), a plug ring (10), a large piston rod (11), a screw cap (3) (13), and a small piston rod (14), characterized in that: The lower part of the housing (1) is provided with an energy projectile mounting cavity, and the upper part is provided with mounting cavities for a large piston rod (11) and a small piston rod (14) and a gas passage (1f). The large piston rod (11) is axially mounted in the large piston rod cavity (1g), with one end threaded to a screw cap (2) and the other end connected to a plug ring (10) to limit the stroke of the large piston rod (11). The housing (1) has a groove at the large piston rod cavity (1g). The large piston rod (11) has a lightening hole at the thick end and a lightening hole at the thin end. It has a threaded hole, and the junction of the thin rod and the thick end is an annular groove. The thin rod passes through the upper cavity and connects to the plug ring (10). The small piston rod (14) is installed vertically in the gas passage (1f). One end is fixed by the screw cap three (13) to limit the stroke of the small piston rod (14). The other end is inserted into the annular groove to constrain the large piston rod (11) in the initial position. After the small piston rod (14) releases the constraint on the large piston rod (11) under the action of gas, the large piston rod (11) moves to the part with a larger cross-sectional area, causing the connecting strip hanging on the thin end to fall off and release the constraint.

2. The constraint release actuator as described in claim 1, characterized in that: The mounting cavity is composed of a first loading cavity (1c), a second loading cavity (1d), a third loading cavity (1e), a large piston rod cavity (1g), and a gas passage (1f) that are interconnected with each other. There are three energy bullets, which are installed in the first loading cavity (1c), the second loading cavity (1d), and the third loading cavity (1e) respectively. An energy bullet stop step surface (1b) is provided at the end of the first loading cavity (1c). A screw plug (9) is provided at the end of the third loading cavity (1e) to fix the energy bullet without affecting the output gas passage of the energy bullet. The gas generated by the energy bullet flows through the second loading cavity (1d) and the gas passage (1f) into the large piston rod cavity (1g).

3. The constraint release actuator as described in claim 2, characterized in that: The housing (1) is provided with a firing pin cavity (1a). The firing pin (3) and the right-hand spring (4) that provides energy for its movement are installed in the firing pin cavity (1a). The tail is screwed to the screw cap (5) to restrict the movement of the firing pin (3) and the spring (4). Under the action of external force, the firing pin impacts the energy ball to generate gas and start the engine.

4. The constraint release actuator as described in claim 3, characterized in that: The firing pin (3) has a multi-step structure, and its end is fixedly connected by a screw cap (5). The guide part has a through groove for ventilation.

5. A constraint release actuator as described in claim 4, characterized in that: The screw cap (2) has a stepped groove structure, with a small hole in the center for the gas to be discharged from the rear of the piston rod cavity (1g) when the piston rod (11) moves, and the opening has an internal hexagonal structure.

6. A constraint release actuator as described in claim 5, characterized in that: The screw cap 2 (5) has a hole in the center, the diameter of which is determined by the diameter of the firing pin rod, and the head is an external hexagonal structure.

7. A constraint release actuator as described in claim 6, characterized in that: The constraint release actuator also includes a pull pin (6), which is equipped with a pulley (7). The pulley (7) is a cylindrical roller with a through hole in the middle. The pull pin (6) is equipped with a three-jaw structure that can increase the stability and smoothness of pulling out, and there is a round hole at the head and tail.

8. A constraint release actuator as described in claim 1, characterized in that: The small piston rod (14) is provided with a slotted groove, a threaded hole and a shear pin hole at its tail. When not in operation, the small piston rod (14) is fixed in the initial position by the friction of the sealing ring and the limitation of the shear pin, thereby locking the large piston rod (11) in the initial position connected to the connecting rope.

9. A constraint release actuator as described in claim 1, characterized in that: The constraint release actuator also includes a rivet (8), which is a flat conical head structure that ensures that the striker rod can pass smoothly through the center hole of the screw cap (5) after riveting.

10. A constraint release actuator as described in claim 1, characterized in that: The constraint release actuator also includes a shear pin (12), which is a round copper wire that restricts the small piston rod (14) to the initial position; the screw cap three (13) has a hole in the center, the diameter of which is determined according to the diameter of the rod of the small piston rod (14); the small hole allows the small piston rod (14) to move upward smoothly but also prevents the small piston rod (14) from flying out after it moves; the screw cap three (13) has an external hexagonal structure for easy installation.

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