Sealed small low-impact release screw bolt

[0012] (1) Select high-strength materials, and initially design a pyrotechnic unlocking bolt separation device; under the premise of ensuring the connection strength of a single device is more than 12kN, based on the optimization design idea, the Matlab program compiled by ourselves is used to determine the size of each component. and the number to be gradually optimized. According to the optimization results, three metal wedges distributed in the circumferential direction of 1200 are used as the connection mechanism between the outer cylinder and the inner cylinder. Miniaturization of the device. (2) By embedding the double O-ring sealing baffle in the device, before the device of the present invention is separated, the piston and the double O-ring sealing baffle contact and cooperate; after separation, the piston is separated from the outer cylinder, and the double O-ring sealing baffle Being stuck inside the outer cylinder, the driving gas generated by the electric detonator is prevented from leaking out, and the high sealing performance and no pollution of the device are realized. (3) The outer cylinder, the inner cylinder and the piston are fixed by shear pins to prevent random rotation of the internal mechanism of the device and ensure the fixation and stability of the device cooperation. (4) Based on the idea of ​​"strong connection and weak unlocking", a metal wedge with high tensile strength is used as the connection locking structure before the device of the present invention is separated. Strong connection. (5) The shear pin is used as the pre-tightening mechanism during separation, and the unlocking separation is realized by shearing the shear pin twice in succession by the piston and the inner cylinder, which greatly reduces the power required for separation, and makes the impact disturbance during separation at Below 2N·s, weak unlocking and low impact are achieved.

[0013] exist figure 1 In the inner cylinder (1), one end of the inner cylinder (1) is threadedly connected with the connecting module of the missile or spacecraft, and the other end is positioned and installed with the piston (4) through a short positioning pin; three wedges (3) are installed in a circumferential direction of 120°. Put them into the three holes reserved in the inner cylinder (1), and put them into the outer cylinder (7) together. Use the shear pin (2) to push out the positioning pin, and insert the outer cylinder (7), the inner cylinder (1) and the piston into the outer cylinder (1). (4) A fixed assembly is formed between the three; install two sealing rings (5) on the double O-ring sealing baffle (6), and put them into the outer cylinder (7) together until they are connected with the thin end of the piston (4). Finally, the electric detonator (8) is installed on the end of the outer cylinder (7) through screw fitting, and the front end of the outer cylinder (7) is aligned with the missile or spacecraft connecting compartment to form a connection.

[0014] figure 2 The 6 pictures in the order of a-b-c-d-e-f show the working principle of the present invention: before separation, the inner cylinder (2) is threadedly connected with the missile or spacecraft connecting cabin, and the outer cylinder (7) is aligned with the connecting cabin. Installed to form the initial state (a) of the connection between the two stages of the separation body; during separation, the detonator (8) generates high-temperature and high-pressure gas expansion after detonation to do work, pushes the piston (4) to move, shears the shear pin for the first time, and reaches the state ( b); The piston (4) continues to move. When the groove of the piston (4) and the wedge (3) are facing each other, the wedge (3) begins to fall to In the groove of the piston (4), the state (c) is reached; the wedge (3) and the piston (4) continue to advance under the push of the double O-ring sealing baffle (6) until the double O-ring sealing baffle (6) Push the inner cylinder (1) to cut the shear pin for the second time to reach state (d); with the complete shearing of the shear pin (2) and the complete drop of the wedge (3), the inner cylinder begins to quickly separate from the outer cylinder The cylinder reaches state (e); finally, the inner cylinder (1) carries the piston (4) and is completely separated from the outer cylinder (7) together with the falling three wedges (3), and reaches state (f).