1. The utility model provides a fuse rigidity recoil insurance mechanism's anti-mechanism that resumes of wedge plug which characterized in that: comprises a safety pin (1), a shearing pin (2) and a wedge plug (3); three-step through holes with gradually increased diameters are formed in the fuse body (4), the three-step through holes are communicated with the fuse piece (5) and the outer wall and sequentially form a first-step hole, a second-step hole and a third-step hole, and when in a fuse state, one end of the safety pin (1) is positioned in the first step hole of the fuse body (4) under the supporting action of the shearing pin (2), the other end of the safety pin (1) is locked at a safety position by a safety piece (5), the safety pin (1) is provided with a shearing pin hole vertical to the central shaft, two ends of the shearing pin hole extend into the fuse body (4), the shearing pin (2) is arranged in the shearing pin hole, the safety pin (1) is fixed at the safety position, the wedge plug (3) is coaxial with the safety pin (1) and is positioned in the second-step hole and the third-step hole, and the top surface of the wedge plug (3) and the bottom surface of the safety pin (1) have a distance.L。

2. The mechanism of claim 1 wherein the force is applied to the latch and the latch is moved to the closed position by the force of the spring, the force being applied to the latch and the latch being moved to the closed position by the spring: a blind hole is formed in the center of the bottom surface of the self-insurance pin (1) upwards, and a plurality of open grooves are formed in the hole wall of the blind hole at equal intervals in an annular shape.

3. The mechanism of claim 2 wherein the force is applied to the latch and the latch is moved to the closed position by the force of the spring, the force being applied to the latch and the latch being applied to the latch by the spring: the opening direction of the open slot is the same as that of the blind hole, and the depth of the open slot is the same as that of the blind hole.

4. The mechanism of claim 1 wherein the force is applied to the latch and the latch is moved to the closed position by the force of the spring, the force being applied to the latch and the latch being moved to the closed position by the spring: the wedge plug (3) comprises a circular truncated cone and a base, the base is cylindrical, the diameter of the base is larger than that of the circular truncated cone, the end face with the large diameter on the circular truncated cone is fixed on the base, the circular truncated cone is located in the second-step hole, the base is located in the third-step hole, and the base is closed up or fixed through the third-step hole in a spot riveting mode.

5. The mechanism of claim 4 wherein the force is applied to the latch and the latch is moved to the closed position by the force of the spring, the force being applied to the latch and the latch being moved to the closed position by the spring: the diameter of a central blind hole in the bottom surface of the safety pin (1) is larger than the end surface with a small diameter of the truncated cone and smaller than the end surface with a large diameter of the truncated cone, the height of the truncated cone of the wedge plug (3) is smaller than the depth of the blind hole in the lower end surface of the safety pin (1), and half of the cone angle of the truncated cone of the wedge plug (3) is smaller than the friction angle between the wedge plug (3) and the safety pin (1);

when a shot is shot, a recoil environment required by the fuse to work is formed, the recoil environment enables a wedge plug reverse recovery mechanism of a rigid recoil safety mechanism of the fuse to be relieved before the maximum bore pressure point of the shot, namely, a shear pin (2) is sheared under the action of recoil force of a safety pin (1), the safety pin (1) loses the supporting action of the shear pin (2) and sinks, and therefore safety of a protected piece (5) is relieved; as the safety pin (1) sinks along the three-order through hole, the truncated cone of the wedge plug (3) is embedded into the blind hole of the safety pin (1), and the safety pin (1) expands radially so as to lock the safety pin (1) in the safety release state.

6. A wedge anti-recoil mechanism for a rigid recoil safety mechanism of a fuse according to any one of claims 1 to 5, further comprising: the safety pin (1) and the shearing pin (2) are made of brass, the wedge plug (3) is made of stainless steel, and the fuse body (4) is made of aluminum alloy or steel; the thickness and the strength of the base of the wedge plug (3) are enough, namely, when the safety pin (1) is seated and impacted on the wedge plug (3), the bottom edge is not damaged.

Background

The fuse recoil safety mechanism utilizes recoil overload environment during projectile launching to relieve safety. However, when the projectile enters the outer ballistic trajectory stage, the recoil overload disappears, the reverse crawling overload can appear, and the reverse nutation overload can also appear for the bullet fuze. Creep overload, nutation overload and other forward axial overloads (such as forward axial overload caused by projectile precession), and recoil after impact when the recoil safety pin is recocked to the bottom, it is possible to restore the safety of the recocked member to the relieved recoil safety mechanism. Therefore, if the anti-recovery function cannot be reliably realized without a centrifugal environment or a centrifugal environment, the recoil safety mechanism needs to be additionally provided with an anti-recovery mechanism specially. The anti-recovery mechanisms are usually designed by combining the overall structural layout of the fuse and a specific ballistic environment, such as serially connecting insurance balls, adopting anti-recovery torsion springs and anti-recovery pre-compression spring pins and the like, and have more complex structures and larger occupied space.

Disclosure of Invention

The invention aims to provide an anti-recovery mechanism of a fuse rigid recoil safety mechanism, which aims to solve the anti-recovery problem of the rigid recoil safety mechanism.

The technical solution for realizing the purpose of the invention is as follows: a wedge plug reverse recovery mechanism of a fuse rigid recoil safety mechanism comprises a safety pin, a shearing pin and a wedge plug; the fuse body is provided with a three-step through hole with gradually increased aperture, the three-step through hole is communicated with the fuse piece and the outer wall and sequentially comprises a first-step hole, a second-step hole and a third-step hole, one end of the fuse pin is positioned in the first-step hole of the fuse body under the supporting action of the shearing pin in the safety state, the other end of the fuse pin locks the fuse piece at the safety position, the fuse pin is provided with a shearing pin hole vertical to the central shaft of the fuse pin, two ends of the shearing pin hole extend into the fuse body, the shearing pin is arranged in the shearing pin hole to fix the safety pin at the safety position, the wedge plug is coaxial with the safety pin and positioned in the second-step hole and the third-step hole and is closed and fixed through the third-step hole, and the distance between the top surface of the wedge plug and the bottom surface of the safety pin existsL。The safety pin is normally locked at the safety position under the supporting action of the shearing pin, and the shearing pin of the safety pin is inserted into the shearing pin through holes on the fuze body and the safety pin to fix the safety pin at the safety position. The shot forms the recoil environment that fuse work required when launching, and the shear pin is cut off under the effect of insurance round pin recoil, and the insurance round pin loses the supporting role of shear pin and sinks. The wall of the blind hole is symmetrically provided with a plurality of open slots, when the safety pin sinks under the action of recoil force, the wedge plug enters the lower end face of the safety pin to cause radial expansion, and then the wedge plug is inserted into the lower end face of the safety pin to expandThe safety pin is locked in a safety release state, and the anti-recovery effect on the safety pin is realized.

Compared with the prior art, the invention has the beneficial effects that:

(1) the wedge plug reverse recovery mechanism of the rigid recoil safety mechanism of the fuse is arranged along the axis of the fuse or in parallel with the axis of the fuse, the increased axial size is smaller, and the radial size is hardly increased.

(2) The structure is simple, and the cost is low.

Drawings

Fig. 1 is a schematic view of a wedge anti-recovery mechanism of the rigid recoil safety mechanism of the fuze of the present invention.

Fig. 2 is a schematic view of the structure of the open slot on the safety pin.

FIG. 3 is a schematic view of a bottom blind hole of the safety pin.

Fig. 4 is a schematic structural view of the wedge plug.

Wherein, 1 is a safety pin, 2 is a shearing pin, 3 is a wedge plug, 4 is a body, and 5 is a safety piece.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

With reference to fig. 1 to 4, a wedge anti-recovery mechanism of a fuze rigid recoil safety mechanism comprises a safety pin 1, a shear pin 2 and a wedge 3; a three-order through hole is formed in the fuse body 4, the three-order through hole is communicated with the fuse piece 5 and the outer wall, and the fuse piece 5 can be a rotor, a sliding block and the like; the aperture of the three-order through hole is increased in proper order from the fuse piece 5 to the outer wall direction, and is set as a first-order hole, a second-order hole and a third-order hole, when in a fuse state, one end of the fuse pin 1 is positioned in the first-order hole of the fuse body 4 under the supporting effect of the shearing pin 2, and the other end of the fuse pin 1 is locked at a fuse position by the fuse piece 5, so that the fuse is realized. The safety pin 1 is provided with a shearing pin hole vertical to the central shaft of the safety pin, two ends of the shearing pin hole extend into the fuse body 4, the shearing pin 2 is arranged in the shearing pin hole, the safety pin 1 is fixed at a safety position, namely, the axis of the detonator on the safety pin is staggered with the axis of the fuse by a certain angle or distance, and the fuse is in an explosion-proof safety state. Wedge 3 and safety pin1 is coaxial, is positioned in the second-step hole and the third-step hole, is closed and fixed by the third-step hole, and has a distance between the top surface of the wedge plug 3 and the bottom surface of the safety pin 1L。

A blind hole is formed upwards from the center of the bottom surface of the safety pin 1, a plurality of open grooves are distributed on the wall of the blind hole at equal intervals in an annular shape, and a plan projection of the blind hole at the bottom of the safety pin 1 is shown in figure 2. The open slot allows the radial expansion of the safety pin 1 when the wedge 3 enters the bottom surface of the safety pin 1. The opening direction of the open slot is the same as that of the blind hole, and the depth of the open slot is the same as that of the blind hole. The wedge plug 3 comprises a circular truncated cone and a base, the base is cylindrical, the diameter of the base is larger than that of the circular truncated cone, the end face with the large diameter on the circular truncated cone is fixed to the top face of the base, the circular truncated cone is located in the second-step hole, the base is located in the third-step hole, and the base is closed and fixed through the third-step hole.

The diameter of a central blind hole in the bottom surface of the safety pin 1 is larger than the end surface with a small diameter of the truncated cone and smaller than the end surface with a large diameter of the truncated cone, the height of the truncated cone of the wedge plug 3 is smaller than the depth of the blind hole in the lower end surface of the safety pin 1, and half of the cone angle of the truncated cone of the wedge plug 3 is smaller than the friction angle between the wedge plug 3 and the safety pin 1; the distance between the top surface of the wedge 3 and the bottom surface of the securing pin 1LGreater than the height of the wedge plugh。

When a shot is shot, a recoil environment required by the fuse to work is formed, the recoil environment enables a wedge plug reverse recovery mechanism of a rigid recoil safety mechanism of the fuse to be relieved before the maximum bore pressure point of the shot, namely the shear pin 2 is sheared under the action of recoil force of the safety pin 1, the safety pin 1 loses the supporting action of the shear pin 2 and sinks, and therefore safety of a protected piece 5 is relieved; as the safety pin 1 sinks along the three-order through hole, the truncated cone of the wedge plug 3 is embedded into the blind hole of the safety pin 1, so that the safety pin 1 expands radially to lock the safety pin 1 in a safety release state.

The safety pin 1 and the shearing pin 2 are made of brass, the wedge 3 is made of stainless steel, and the fuse body 4 is made of aluminum alloy or steel; base thickness of wedge 3eAnd the strength should be sufficient that the bottom edge is not damaged when the safety pin 1 is squat to impact the wedge 3.

The frustum height of the wedge plug 3 ishDepth of blind hole on bottom surface of safety pin 1Degree ofH(ii) a Frustum height of wedge 3hShould be less than the depth of the blind hole on the bottom surface of the safety pin 1H。The diameter of the bottom of the frustum of the wedge plug 3 isdThe diameter of the opening on the bottom surface of the safety pin 1 isD. Frustum bottom diameter of wedge plug 3dShould be larger than the diameter of the opening at the lower end of the safety pin 1D. Furthermore, the taper angle of the wedge 3αShould be smaller than the friction angle between the wedge 3 and the safety pin 1. When the safety pin 1 sinks under the action of recoil force, the wedge 3 enters the lower end surface of the safety pin 1 and expands radially, so that the safety pin 1 is locked in a safety release state, and the reaction recovery effect on the safety pin 1 is realized.

The invention has the difficulty that the self-locking principle of the friction angle is skillfully utilized, on the premise of not occupying the radial dimension, the problem of rebound, namely rebound recovery, of the recoil safety pin is solved only by adding one wedge-shaped part in a smaller space, and the wedge-shaped part, namely other related parts, is improved, almost all has a rotary body in shape, so that the producibility is good, and the reliability is easy to guarantee.