CN-122015593-A - Collision interception type lamination type fuze MEMS (micro electro mechanical System) squatting safety mechanism arranged on vertical spring shaft

CN122015593ACN 122015593 ACN122015593 ACN 122015593ACN-122015593-A

Abstract

The invention discloses a collision interception type lamination type MEMS (micro electro mechanical System) squat safety mechanism arranged on a vertical spring shaft, and belongs to the technical field of fuse safety and safety relief. The mechanism comprises a top plate, an upper mass block layer, an intermediate layer, a lower mass block layer and a bottom plate from top to bottom in sequence, wherein the upper mass block layer and the lower mass block layer are respectively provided with an upper mass block and a lower mass block which are connected through micro springs, the intermediate layer is provided with a channel for the upper mass block to pass through, and a rebound distance is reserved between the bottom plate and the lower mass block. The invention utilizes different dynamic responses of the double mass blocks under load to realize insurance logic, namely, under the short pulse width falling load, the lower mass block touches the bottom and rebounds to collide with the upper mass block which moves downwards, so that the upper mass block can not achieve the decomposition and protection displacement, under the long pulse width emission load, the lower mass block is pressed at the bottom under the continuous overload, and a movement channel is reserved for the upper mass block, so that the upper mass block moves downwards to finish the decomposition and protection. The MEMS safety device is compact in structure and suitable for MEMS safety devices in the form of vertical spring shafts.

Inventors

CAO YUN
HUANG LIU
LU HAINING
PEI FEI
ZHU HENGBO
NIE WEIRONG
XI ZHANWEN

Assignees

南京理工大学

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (3)

1. The collision interception type lamination type fuze MEMS squatting safety mechanism is characterized by sequentially comprising a top plate, an upper mass block layer, an intermediate layer, a lower mass block layer and a bottom plate lamination; the upper mass block layer comprises an upper mass block layer frame and an upper spring mass block system suspended and fixed in the center of the upper mass block layer frame; The middle layer is used for providing a movement space parallel to the uniaxial direction for the upper spring mass system and the lower spring mass system; the lower mass block layer comprises a lower mass block layer frame and a lower spring mass block system which is suspended and fixed in the center of the lower mass block layer frame; the bottom plate is used for limiting the whole mechanism and is provided with a space for limiting the maximum movement travel of the lower spring mass block system; the upper spring mass block system and the lower spring mass block system are made of the same material and are coaxially aligned in the direction parallel to the spring axis, the mass of the upper spring mass block system is smaller than that of the lower spring mass block system, the natural frequency of the lower spring mass block system is higher than that of the upper spring mass block system, and the bottoming displacement of the lower spring mass block system is shorter than that required by the upper spring mass block system to reach the unlocking position.
2. The collision interception type lamination type fuse MEMS squat safety mechanism arranged on a vertical spring shaft according to claim 1, wherein the upper spring mass block system comprises an upper mass block and upper springs uniformly distributed on the left side and the right side of the upper mass block, the lower spring mass block system comprises a lower mass block and lower springs uniformly distributed on the left side and the right side of the lower mass block, and the projection area of the upper mass block along the spring shaft direction is slightly smaller than the area of the lower mass block.
3. The vertical spring axis arranged impact blocking laminated fuze MEMS squat safety mechanism of claim 1, wherein the upper spring mass system has a thickness d 1 , the lower spring mass system has a thickness d 3 , and the lower mass is spaced from the base plate by a distance d 4 ,d 4 ＜d 1 +d 2 .

Description

Collision interception type lamination type fuze MEMS (micro electro mechanical System) squatting safety mechanism arranged on vertical spring shaft Technical Field The invention belongs to the technical field of fuse safety and arming, and particularly relates to an MEMS (micro electro mechanical system) squat safety mechanism which is arranged in a vertical spring shaft and utilizes a double-mass block collision interception principle to distinguish service falling and transmitting loads. Background In the design of fuze safety devices, the main function of the squat safety mechanism is to sense the squat overload during firing to release the safety, and at the same time, the safety must be ensured under the unexpected drop impact during service phases (e.g., transportation, loading and unloading). Drop impact loads are typically characterized by high amplitude and short duration (short pulse width), while firing loads are typically characterized by moderate amplitude and long duration (long pulse width). Wherein, the firing load of the small-caliber shell is usually 30000g to 110000g, the pulse width is 3ms to 7ms, the firing load of the medium-caliber shell is usually 1000g to 30000g, the pulse width of the firing is 1.4ms to 8ms, the service load is usually 5000g to 20000g, and the pulse width is 0.1ms to 0.3ms. The existing MEMS recoil safety mechanism adopts parallel spring shaft arrangement or vertical spring shaft arrangement, wherein impact load born by small-caliber shells in the launching stage is high, the single-degree-of-freedom cantilever beam type recoil safety mechanism adopting vertical spring shaft arrangement can distinguish service and launching load and meet the requirements of service safety and guaranteeing reliability, the launching load born by medium-caliber shells and large-caliber shells is relatively low, and the single-degree-of-freedom cantilever beam type recoil safety mechanism is difficult to effectively distinguish falling interference and launching load only by amplitude difference, so that misoperation of the mechanism is easy to occur in a falling environment, and the safety and reliability of the whole life cycle cannot be guaranteed. Therefore, the middle-caliber and large-caliber cannonball adopts a Z-shaped tooth, a zigzag groove, a gating mechanism, a double-degree-of-freedom system and other forms of a squat safety mechanism, but because the squat safety mechanism is of a plane structure, the squat safety mechanism senses squat load in the direction of a parallel spring shaft, the arrangement form of the parallel spring shaft is required, the axial size is enlarged, and the problem that the reliability of the explosion is insufficient due to the fact that the corner is required for explosion propagation is required, the MEMS squat safety mechanism which adopts the arrangement of the vertical spring shaft and has distinguishing capability is needed. Disclosure of Invention The invention aims to provide an MEMS (micro electro mechanical system) squat safety mechanism arranged on a vertical spring shaft, which utilizes different dynamic responses of double mass blocks under different pulse width loads to enable a lower mass block to collide with an upper mass block after bottoming rebound to intercept the upper mass block, so that the distinction between a launching load and a falling load is realized, the problem of insufficient safety of the existing mechanism under a falling environment is solved, and the gap of the MEMS squat safety mechanism which is suitable for medium-large caliber shells and is arranged on the vertical spring shaft is made up. The technical solution for realizing the purpose of the invention is as follows: the collision interception type lamination type fuze MEMS squatting safety mechanism arranged on the vertical spring shaft sequentially comprises a top plate, an upper mass block layer, a middle layer, a lower mass block layer and a bottom plate lamination; the upper mass block layer comprises an upper mass block layer frame and an upper spring mass block system suspended and fixed in the center of the upper mass block layer frame; The middle layer is used for providing a movement space parallel to the uniaxial direction for the upper spring mass system and the lower spring mass system; the lower mass block layer comprises a lower mass block layer frame and a lower spring mass block system which is suspended and fixed in the center of the lower mass block layer frame; the bottom plate is used for limiting the whole mechanism and is provided with a space for limiting the maximum movement travel of the lower spring mass block system; the upper spring mass block system and the lower spring mass block system are made of the same material and are coaxially aligned in the direction parallel to the spring axis, the mass of the upper spring mass block system is smaller than that of the lower spring mass block system, the natural frequency of the