Long-life inertia cut-off type explosion-proof mechanism

Abstract

The invention discloses a long-life inertia cut-off type explosion-proof mechanism which comprises an explosion-proof body and an inertia component installed in the explosion-proof body, the inertia component comprises a cut-off rod, the cut-off rod is limited in the explosion-proof body in the circumferential direction, and the cut-off rod is axially limited through a cut-off pin and axially supported through a spring. The tail end of the cut-off rod is coaxially and fixedly connected with a detonating tube shell, a cavity for filling a detonating grain is arranged between the cut-off rod and the detonating tube shell, and the explosion suppression body is provided with a detonator, a relay grain and a booster grain which are matched with the detonating grain. The cut-off pin of the cut-off type explosion-proof mechanism is not subjected to any external force in a standing state, the defect of fatigue fracture of the cut-off pin under the long storage condition is avoided, the cut-off rod does not axially move, and the long storage requirement of the explosion-proof mechanism can be fully met.

Description

Technical Field

[0001] The invention relates to the technical field of fuze insurance, in particular to a long-life inertial cut-off type explosion-proof mechanism. Background Art

[0002] The explosion-proof mechanism of the fuze is a safety mechanism used to ensure the safety of ammunition. Its function is to ensure the safety of the fuze, especially the safety of service handling. The service handling of the fuze refers to the entire environment that the fuze experiences from the factory to before launch, including transportation, handling, stacking and stacking of ammunition boxes, hoisting during transportation, and even more severe environmental conditions, such as vibration and bumping during transportation, and accidental falling during loading, which require that the fuze safety mechanism shall not be released prematurely, ignited prematurely, or become invalid.

[0003] With the development of modern warfare, more and more ammunition is consumed in wartime, so there needs to be sufficient reserves in peacetime. At the same time, the military has higher and higher requirements for the long storage period of fuzes, and now there is even a requirement for a storage period of up to 27 years. The cut-off pins in traditional inertial cut-off pin explosion-proof mechanisms are subject to various environmental forces during routine service processing, and are prone to fatigue fracture, which cannot meet their long storage requirements. Summary of the invention

[0004] In view of the above technical problems, the present invention proposes a long-life inertial cut-off type explosion-proof mechanism, the cut-off pin of the cut-off type explosion-proof mechanism is not subjected to any external force in a static state, the cut-off pin will not have the defect of fatigue fracture under long-term storage conditions, and the cut-off rod has no axial movement, which can fully meet the long-term storage requirements of the explosion-proof mechanism.

[0005] A long-life inertial cut-off explosion-proof mechanism comprises an explosion-proof body and an inertial component installed in the explosion-proof body, wherein the inertial component comprises a cut-off rod, wherein the cut-off rod is circumferentially limited in the explosion-proof body, the cut-off rod is axially limited by a cut-off pin and axially supported by a spring, the end of the cut-off rod is coaxially fixedly connected to a detonating tube shell, a cavity for loading an explosive charge column is provided between the cut-off rod and the explosion-proof tube shell, and a detonator, a relay charge column and a transfer charge column cooperating with the explosive charge column are provided on the explosion-proof body.

[0006] As a preferred embodiment of the above technical solution, the supporting force of the spring on the cutting rod is not less than the sum of the deadweights of the cutting rod, the detonating tube shell and the explosive column.

[0007] As a preferred embodiment of the above technical solution, the inertia component also includes a sleeve, the outer circumference of the sleeve is threadedly connected to the explosion-proof body, the cutting rod is circumferentially limited in the sleeve, the sleeve and the cutting rod are axially limited by the cutting pin, the spring is sleeved on the cutting rod, and the upper and lower ends of the spring are respectively limited by the cutting rod and the reducing bosses on the explosion-proof body.

[0008] As a preferred embodiment of the above technical solution, when the cutting pin is in a normal state, the cutting rod is limited by the lower end surface of the sleeve to avoid generating an upward shear force on the cutting pin.

[0009] As a preferred embodiment of the above technical solution, the cutting rod is provided with a limit block in the circumference thereof, and the inner wall of the explosion-proof body is provided with a guide stop groove adapted to the limit block parallel to its axis.

[0010] As a preferred embodiment of the above technical solution, an annular groove is provided on the cutting rod below the limit block, and a steel ball is provided in the annular groove. When the cutting pin is normal, the steel ball is simultaneously placed in the guide stop groove. After the cutting-off explosion-proof mechanism is triggered into place, the steel ball is clamped between the sleeve and the cutting rod.

[0011] As a preferred embodiment of the above technical solution, the explosion-proof body is a stepped shaft with a smaller upper part and a larger lower part, the detonator and the relay charge are arranged opposite to each other perpendicular to the axis of the explosion-proof body, and the booster charge is arranged on the same side as the relay charge.

[0012] The beneficial effects of the present invention are:

[0013] During the normal service process of the present invention, the cutting rod cannot move axially due to the service spring, and cannot rotate circumferentially due to the self-guided boss. Therefore, the cutting pin is not affected by other environmental forces except its own gravity during the normal service process, and the cutting pin will not have the defect of fatigue fracture under long storage conditions. When the projectile hits the target, the cutting rod cuts off the cutting pin under the action of inertia force under large overload conditions. After the cutting rod moves into place, the steel ball locks the cutting rod. When the ignition condition is met, the detonator acts, and then the explosion sequence acts to detonate the main charge. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the explosion-proof mechanism when it is stationary.

[0015] Figure 2 This is a schematic diagram of the structure after the explosion-proof mechanism is triggered.

[0016] Figure 3 Schematic diagram of the structure of the cutting pin.

[0017] Figure 4 It is a schematic diagram of the structure of the sleeve.

[0018] The accompanying drawings are marked as follows: 1-explosion-proof body, 2-cut-off rod, 3-cut-off pin, 4-spring, 5-detonating tube shell, 6-explosive charge column, 7-detonator, 8-relay charge column, 9-transmitting charge column, 10-sleeve, 11-limiting block, 12-guide stop groove, 13-annular groove, 14-steel ball, 15-paper pad, 16-pin hole. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 A long-life inertial cut-off explosion-proof mechanism is shown, comprising an explosion-proof body 1 and an inertial component installed in the explosion-proof body 1, wherein the inertial component comprises a cut-off rod 2, wherein the cut-off rod 2 is circumferentially limited in the explosion-proof body 1, the cut-off rod 2 is axially limited by a cut-off pin 3 and axially supported by a spring 4, the end of the cut-off rod 2 is coaxially fixedly connected to a detonating tube shell 5, a cavity for loading an explosive charge column 6 is provided between the cut-off rod 2 and the explosion-proof tube shell 5, and a detonator 7, a relay charge column 8 and a transfer charge column 9 cooperating with the explosive charge column 6 are provided on the explosion-proof body 1.

[0021] In this embodiment, the explosion-proof body 1 is a stepped shaft with a small upper part and a large lower part. The inertial component is coaxially installed in the explosion-proof body 1. The detonator 7 and the relay charge 8 are arranged opposite to each other perpendicular to the axis of the explosion-proof body 1. The explosive booster charge 9 is arranged on the same side as the relay charge 8.

[0022] It should be noted that, according to common practice, the contact surface between the detonating charge column 6 and the cut-off pin 3 is also provided with a paper pad 15, the detonating tube shell 5 is riveted to the end of the cut-off rod 2, the hole on the flameproof body 1 for accommodating the detonator 7 is connected to the blind hole for installing the cut-off rod 2, and the blind hole for installing the explosive charge column 9 is vertically arranged below the blind hole for installing the relay charge column 8.

[0023] Under the action of external force, the cutting rod 2 generates a downward shear force on the cutting pin 3, causing the cutting pin 3 to break. The cutting rod 2 continues to move downward until the detonator 7, the explosive column 6 and the relay charge column 8 are on the same axis, and the ignition condition is met. Then the detonator 7 acts, and then the detonation sequence acts to detonate the main charge.

[0024] In this embodiment, the support force of the spring 4 on the cutting rod 2 is not less than the sum of the deadweight of the cutting rod 2, the detonating tube shell 5 and the detonating charge column 6, the purpose of which is to avoid the downward shear force on the cutting pin 3 due to the deadweight of the cutting rod 2, the detonating tube shell 5 and the detonating charge column 6. At the same time, the upward support force of the spring 4 can also offset the overload force generated by the cutting-type flameproof mechanism on the cutting rod 2 during road transportation.

[0025] In this embodiment, the inertial component further includes a sleeve 10, the outer circumference of the sleeve 10 is threadedly connected to the flameproof body 1, the cutting rod 2 is circumferentially limited in the sleeve 10, the sleeve 10 and the cutting rod 2 are axially limited by the cutting pin 3, the spring 4 is sleeved on the cutting rod 2, and the upper and lower ends of the spring 4 are respectively limited by the reducing bosses on the cutting rod 2 and the flameproof body 1. Among them, the spring 4, the sleeve 10, the cutting rod 2, the cutting pin 3 and the detonator shell 5 are all made of steel, and the flameproof body 1 is made of aluminum.

[0026] In this embodiment, when the cutting pin 3 is in a normal state, the cutting rod 2 is limited by the lower end surface of the sleeve 10 to avoid generating an upward shear force on the cutting pin 3.

[0027] In this embodiment, the cutting rod 2 is provided with a limit block 11 in the circumferential direction, and the inner wall of the flameproof body 1 is provided with a guide stop groove 12 adapted to the limit block 11 in parallel with its axis. In this embodiment, the limit block 11 is an arc block, evenly arranged on the edge of the top surface of the cutting rod 2, and correspondingly, the guide stop groove 12 is an arc groove, evenly arranged along the inner wall of the sleeve 10, such as Figure 3 shown.

[0028] In this embodiment, an annular groove 13 is provided on the cutting rod 2 below the limit block 11. Specifically, the annular groove 13 is arranged adjacent to the lower end surface of the limit block 11. A steel ball 14 is arranged in the annular groove 13. When the cutting pin 3 is normal, the steel ball 14 is simultaneously placed in the guide stop groove 12. After the cutting-off explosion-proof mechanism is triggered into place, the steel ball 14 is clamped between the sleeve 10 and the cutting rod 2. The variable diameter boss for limiting the steel ball 14 is arranged above the pin hole 16 for positioning the cutting pin 3 on the sleeve 10, as shown in FIG. Figure 3 As shown, when the cut-off pin moves downward to Figure 2 In the state shown, after the steel ball 14 rotates along the annular groove 13 to deviate from the guide stop groove 12, it is limited by the reducing boss above the pin hole 16 on the sleeve 10, thereby preventing the cutting rod 2 from moving upward under the upward force of the spring 4.

[0029] It should be noted that the cutting rod 2 is a multi-section variable diameter shaft, and the flameproof body 1 has a variable diameter blind hole that cooperates with the cutting rod. When the cutting rod 2 is acted downward by an external force, the variable diameter boss in the flameproof body 1 can also prevent the cutting rod 2 from colliding with the bottom surface of the blind hole in the flameproof body 1.

[0030] During the normal service process of the present invention, the cutting rod 2 cannot move axially due to the action of the spring 4, and cannot rotate circumferentially due to the action of its own limit block 11. Therefore, the cutting pin 3 is not affected by other environmental forces except its own gravity during the normal service process, and the cutting pin 3 will not have the defect of fatigue fracture under long storage conditions. When the projectile hits the target, the cutting rod 2 cuts off the cutting pin 3 under the action of inertia force under large overload conditions. After the cutting rod 2 moves into place, the steel ball 14 locks the cutting rod 2. When the ignition condition is met, the detonator acts, and then the explosion sequence acts to detonate the main charge.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A long-life inertial cut-off explosion-proof mechanism, characterized in that: It includes a flameproof body and an inertial component installed in the flameproof body, the inertial component includes a cutting rod, the cutting rod is circumferentially limited in the flameproof body, the cutting rod is axially limited by a cutting pin and axially supported by a spring, the end of the cutting rod is coaxially fixedly connected to a detonating tube shell, a cavity for loading explosive columns is provided between the cutting rod and the detonating tube shell, and the flameproof body is provided with detonators, relay columns and explosive columns that cooperate with the explosive columns.

2. The cut-off type explosion-proof mechanism according to claim 1 is characterized in that: The supporting force of the spring on the cutting rod is not less than the sum of the deadweights of the cutting rod, the detonating tube shell and the explosive column.

3. The cut-off type explosion-proof mechanism according to claim 1 is characterized in that: The inertia component also includes a sleeve, the outer circumference of the sleeve is threadedly connected to the flameproof body, the cutting rod is circumferentially limited in the sleeve, the sleeve and the cutting rod are axially limited by the cutting pin, the spring is sleeved on the cutting rod, and the upper and lower ends of the spring are respectively limited by the cutting rod and the reducing boss on the flameproof body.

4. The cut-off type explosion-proof mechanism according to claim 3 is characterized in that: When the cutting pin is in a normal state, the cutting rod is limited by the lower end surface of the sleeve to avoid an upward shear force on the cutting pin.

5. The cut-off type explosion-proof mechanism according to claim 3 is characterized in that: The cutting rod is provided with a limit block in the circumferential direction, and the inner wall of the explosion-proof body is provided with a guide anti-rotation groove adapted to the limit block parallel to its axis.

6. The cut-off type explosion-proof mechanism according to claim 4 is characterized in that: An annular groove is provided on the cutting rod below the limit block, and a steel ball is provided in the annular groove. When the cutting pin is normal, the steel ball is simultaneously placed in the guide stop groove. After the cutting-off explosion-proof mechanism is triggered into place, the steel ball is clamped between the sleeve and the cutting rod.

7. The cut-off type explosion-proof mechanism according to claim 1 is characterized in that: The flameproof body is a stepped shaft that is smaller at the top and larger at the bottom. The detonator and the relay charge are arranged opposite to each other perpendicular to the axis of the flameproof body. The booster charge is arranged on the same side as the relay charge.

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