CN113865449B

CN113865449B - Mechanical trigger fuze for bottom of grenade of line-bore artillery

Info

Publication number: CN113865449B
Application number: CN202111108400.0A
Authority: CN
Inventors: 王雨时; 黄井钵
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2023-05-05
Anticipated expiration: 2041-09-22
Also published as: CN113865449A

Abstract

The invention discloses a mechanical trigger fuse at the bottom of a grenade of a line bore artillery, which comprises a booster shell, booster powder, a reinforcing cap, a gasket, a ball cover, a separation ball, a needle detonator, a split ring, a ball seat, a firing pin, a ballistic spring, a firing pin sleeve, a self-destruction spring, an inertia body, a striking ball and an eccentric centrifugal ball which are coaxially arranged from top to bottom in the fuse body. Wherein the isolating ball is an explosion-proof piece and forms a ball rotor together with the needle detonator. The ball rotor is locked at the explosion-proof position by the firing pin and the split ring at ordinary times, so that redundant safety is realized. The firing pin and the split ring are used for releasing the safety of the ball rotor respectively depending on the recoil and rotation environment during firing. The ball rotor also achieves a prolonged arming distance of 20 m. The fuze has the functions of floor cleaning and frying, large-angle ignition and centrifugal self-destruction, and can be reliably triggered when being applied to a 35 mm caliber antiaircraft grenade and being hit vertically on a 2 mm thick aluminum alloy target plate. Meets the relevant requirements of GJB373B-2019 fuze safety design criterion.

Description

Mechanical trigger fuze for bottom of grenade of line-bore artillery

Technical Field

The invention belongs to the technology of a mechanical trigger fuse of a rotary shell, and particularly relates to a mechanical trigger fuse of a bottom of a grenade of a line bore artillery shell.

Background

Small caliber ammunition is generally ammunition with caliber of 20 mm to 40 mm and is launched by an artillery to achieve the purposes of killing, blasting, burning or other tactical purposes, and is widely used in land, sea, air three armies and other combat forces due to strong maneuverability and high launching speed.

The small-caliber artillery grenade is provided with a bullet head mechanical trigger fuze. Compared with a warhead mechanical trigger fuse, the small-caliber artillery grenade is matched with a warhead mechanical trigger fuse, so that the requirements of flame-proof, redundancy safety, rain protection, dullness, trigger delay, floor scrubbing and explosion and large ignition angle of the fuse are met. The multifunctional grenade of the swiss 35 mm antiaircraft gun is equipped with a primer for mechanical triggering, but the structural details are not detailed. AOP-8 NATO FUZE CHARACTERISTICS DATA discloses a type Germany primer for a 35 mm caliber antiaircraft gun DM31 grenade, model DM821. The fuze adopts a ball rotor explosion-proof mechanism, a soft belt delay releasing safety mechanism and a centrifugal plate self-destruction mechanism. The whole fuze has about 37 constituent units without the bottom attached light-emitting tube, and the structure is complex, so that the cost is difficult to control and the reliability is difficult to ensure.

Disclosure of Invention

The invention aims to provide a mechanical trigger fuze for the bottom of a grenade of a line-bore artillery, which improves the reliability of the fuze and can greatly reduce the cost.

The technical solution for realizing the purpose of the invention is as follows: a mechanical trigger fuse at the bottom of a grenade of a line bore artillery comprises a coaxial explosion-transmitting tube shell, explosion-transmitting powder, a reinforcing cap, a separation ball, a needle detonator, a firing pin, a self-destruction spring, a striking ball, a fuse body, an inertia body, a firing pin sleeve, a centrifugal ball, a ballistic spring, a ball seat, an opening ring, a ball cover and a gasket. Wherein two identical needled detonators are arranged in the isolating balls to form a ball rotor. The isolating ball is used as an explosion-proof piece to enable the detonator to be in an explosion-proof state at ordinary times, the ball rotor achieves a delay releasing safety function after the fuse safety mechanism releases safety, the fuse is ensured to be aligned with the explosion-transmitting tube only after the fuse flies out of the safety distance of the muzzle, and the ordinary times and the emission safety are ensured. The isolating ball, the two acupuncture detonators, the ball seat, the opening ring and the ball cover form a safety and safety releasing mechanism. Wherein the detonating tube shell, the detonating agent, the reinforcing cap and the gasket form the detonating tube. The firing mechanism is coaxially arranged at the rear end of the safety and arming mechanism, and realizes one safety of the ball rotor, namely the squat safety. The centrifugal safety mechanism (piece) is an open ring and is clamped at the outer side of the crescent groove at the lower end of the isolating ball, so that the other safety of the ball rotor is realized.

Compared with the prior art, the invention has the remarkable advantages that: (1) The soft belt with poor production process is cancelled, the related design requirements of fuze safety design criterion are comprehensively met by using fewer parts under the condition of smaller space constraint, and the soft belt specifically comprises explosion-proof safety, redundant safety, delay releasing safety and the like, and has the advantages of simple structure, high reliability and low cost.

(2) The ball seat is uniformly provided with a plurality of axial through holes on the circumference deviating from the central axis, so that the function of observing whether the opening ring is in neglected loading or not during the assembly of the fuze can be achieved, and the functions of releasing the pressure of the inner cavity of the fuze and improving the explosion-proof safety can be achieved.

(3) The striking ball part is added into the cone nest of the inertial body at the bottom of the fuze body, so that the fuze triggering sensitivity is greatly improved.

Drawings

Fig. 1 is a schematic diagram of the structure of the mechanical trigger fuse of the bottom of the grenade of the present invention.

In the figure: comprises a detonating tube shell 1, detonating powder 2, a reinforcing cap 3, a separation ball 4, a needle detonator 5, a firing pin 6, a self-destruction spring 7, a striking ball 8, a fuze body 9, an inertia body 10, a firing pin sleeve 11, a centrifugal ball 12, a ballistic spring 13, a ball seat 14, an opening ring 15, a ball cover 16 and a gasket 17 which are coaxially arranged. The two identical needled detonators 5 are arranged in the isolating balls to form a ball rotor, the isolating balls are used as explosion-proof pieces to enable the detonators to be in explosion-proof state at ordinary times, the ball rotor achieves a delay releasing safety function after the fuse safety mechanism releases safety, the fuse is enabled to be aligned with the blasting tube only after the fuse is enabled to fly out of the safety distance of the muzzle, and the ordinary safety and the emission safety are ensured. Wherein the booster tube comprises a booster tube shell 1, a booster 2, a reinforcing cap 3 and a gasket 17. The ignition mechanism comprises a firing pin 6, a self-destruction spring 7, an inertia body 10, a firing pin sleeve 11 and a centrifugal ball 12, and is coaxially arranged at the rear end of the explosion-proof mechanism, so that one safety of a ball rotor, namely, a squat safety is realized. The centrifugal safety machine component is an opening ring and is clamped at the outer side of a crescent groove at the lower end of the isolation ball, so that the other safety of the ball rotor is realized.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings.

In combination with fig. 1, a mechanical trigger fuze at the bottom of a grenade with a line bore comprises a detonating tube, a safety and release mechanism, a gasket 17, a ballistic spring 13, a firing mechanism and a striking ball 8 which are coaxially arranged from top to bottom in the inner cavity of a fuze body 9.

The booster tube comprises a booster tube shell 1 with a downward opening, booster 2 press-fitted in the booster tube shell 1, a reinforcing cap 3 for sealing the booster tube shell 1 and the booster 2, and a gasket 17 for adjusting the vacancy depth of the reinforcing cap 3 relative to the booster tube shell 1. The explosive transfer agent is made of black-14 explosive transfer agent. The upper end face of the booster tube is the upper end face of the booster tube shell 1 and is basically flush with the annular face of the upper end face of the fuze body 9. The upper part of the detonating tube is used as the output end of the fuze, and the main charge of the projectile and the medicine surface adjusting paper pad in the projectile are arranged above the detonating tube. The booster tube is connected with the inner cavity of the fuze body 9 by the external thread of the outer wall of the booster tube shell 1.

The ignition mechanism belongs to a needling ignition mechanism and comprises a firing pin 6, a self-destruction spring 7, an inertia body 10, a

firing pin sleeve

11 and 6 centrifugal balls 12, wherein the ignition mechanism is coaxially arranged at the bottom of an inner cavity hole of a fuse body 9 and is positioned below a safety and safety releasing mechanism. Wherein 6 centrifugal balls 12 are arranged off-axis. The first explosive element to match the firing mechanism is a needle detonator 5 in the isolation ball 4. The ignition mechanism can realize the functions of inertial triggering ignition and centrifugal self-destruction ignition. The inertia body 10 and the firing pin sleeve 11 are riveted together, the firing pin 6, the self-

destruction spring

7 and 6 centrifugal balls 12 are contained, a firing module component is formed, assembly and assembly quality monitoring are facilitated, the firing pin tip of the firing pin 6 extends upwards from the firing pin sleeve 11 and then is clamped in the second blind hole of the isolation ball 4, the recoil safety of the isolation ball 4 is achieved, the self-destruction spring 7 is arranged between the bottom surface of the firing pin 6 and the bottom surface of the inner cavity of the inertia body 10, the ballistic spring 13 is sleeved on the outer walls of the firing pin 6 and the firing pin sleeve 11, and two ends of the ballistic spring are respectively propped against the ball seat 14 and the inertia body 10. The outer diameter of the inertia body 10 is matched with the aperture of the inner cavity of the fuze body 9.

The safety and arming mechanism is located below the booster tube and comprises an isolation ball 4 (which is a main explosion-proof piece), two acupuncture detonators 5, a ball seat 14, a split ring 15 and a ball cover 16, wherein the two acupuncture detonators 5 are arranged in the isolation ball 4 to form a ball rotor. Ball seat 14 and ball cover 16 are pressed together to form the receiving and moving chamber of the ball rotor and also form the safety and arming mechanism module components for ease of assembly and quality monitoring of assembly. The isolating ball 4 is a sphere with incomplete outline, and the lower end of the isolating ball is provided with a second blind hole and a crescent groove around the axis of the fuze. The split ring 15 is an elliptical ring with one end open, is a centrifugal safety mechanism and is clamped into a crescent notch groove at the lower end of the isolation ball 4, so that centrifugal safety of the ball rotor is realized. The firing pin 6 of the firing mechanism is inserted into the second blind hole at the lower end of the isolation ball 4 at ordinary times, the recoil safety of the ball rotor is realized, and the centrifugal safety of the split ring 15 of the isolation ball 4 and the recoil safety of the firing pin 6 form the redundant safety of the fuze. The isolating ball 4 is locked in the explosion-proof state by the split ring 15 and the firing pin 6 at ordinary times, namely, the axis of the detonator 5 on the isolating ball 4 is deviated from the axis of the booster tube and the axis of the firing pin 6 by 90 degrees. The outer circle of the ball cover 16 is provided with external threads which are the same as those on the explosion propagation tube shell 1 and are connected with the internal threads of the fuze body 9 so as to ensure the requirements of the explosion-proof state and the connection strength of the fuze structure when the projectile passes through the target. The lower end surface of the ball seat 14 abuts against the annular table of the fuze inner cavity to realize axial positioning. The ball seat 14 is uniformly provided with a plurality of through holes along the axial direction on the circumference deviating from the center, which is not only a peephole used for observing whether the split ring 15 is neglected to be installed and whether the position of the isolation ball 4 is correct in the assembly process, but also an internal pressure release channel of a high-temperature high-pressure gas product formed by accidental ignition and explosion of the detonator 5 in the explosion-proof state, and the high-temperature high-pressure gas product is downwards introduced into the ignition mechanism cavity, so that the explosion-proof safety of the detonator is improved. The above ball seat 14 and the ball cover 16 are in interference fit, so that the assembly correctness of the isolation ball 4 can be checked through the central holes on the ball seat 14 and the ball cover 16 after the isolation ball 4 is installed, namely, the isolation ball is assembled into an explosion-proof state, and then the next assembly is performed, thereby ensuring that the whole fuse is assembled into a safe state, namely, a non-arming state.

A ballistic spring 13 is arranged between the safety and release safety mechanism and the ignition mechanism, and is used for preventing the ignition mechanism on the outer ballistic trajectory from moving forward under the action of crawling force, so that the ignition mechanism can strike the needled detonator 5 in the safety and release safety mechanism to trigger ballistic explosion.

The blind hole is arranged in the center of the bottom surface of the inner cavity of the fuze body 9, the center of the bottom surface of the inertia body 10 is arched upwards to form a conical nest, the striking ball 8 is arranged between the blind hole of the fuze body 9 and the conical nest of the inertia body 10, the axial movement of the original striking block in a sliding mode is replaced by the rolling of the striking ball 8, the friction force is small, the problem that the guide is short and easy to lock is avoided, the energy loss of inertia forward impact of the fuze inertia trigger mechanism when the fuze inertia trigger mechanism is used for triggering is greatly reduced, and the inertia trigger sensitivity of the fuze is improved. The impact ball 8 is changed from a stainless steel ball to a tungsten alloy ball with high precision (diameter error is within +/-0.01 millimeter), the density and the mass are increased by about 1 time, and the inertia forward-impact energy is improved, so that the inertia trigger sensitivity of the fuze is improved. The ball 8 was selected to have a high density (density of 5.8 g/cm) ³ Above) ceramic balls, thenThe friction force of rolling and sliding is reduced, so that the inertial triggering sensitivity of the fuze is improved.

The inner cavity of the fuze body 9 is in a stepped hole shape, the outer part is large, the inner part is small, and the innermost step is matched with the inertial body 10 to thicken the tool retracting groove part of the fuze body 9, so that the strength of the fuze body during launching, target collision and target penetration is improved.

In the service processing stage, the GJB573B (fuze and fuze part environment and performance test method) prescribes credible impact and vibration, including drop and transportation vibration, and the like, can not change the fuze into a factory state. The fuse structure is strong enough to withstand falling impact generated by indirect collision, and does not cause harm to reliability and safety. 1.5 Direct collision caused by the falling of the bare state at the m height does not reduce the safety of the fuze, and the safety of use, including the emission safety, can be ensured. The self-destruction spring 7 below the firing pin 6 in the fuze firing mechanism is also a safety spring of the squat safety mechanism. Even if the fuze bottom falls down to a position at the most unfavorable 1.5 m, the self-destruction spring 7 can ensure that the front end of the firing pin 6 is always inserted into the blind hole of the isolation ball 4, and the isolation ball is in an explosion-proof state. The split ring 15 is also always in the safety position, and can not be opened when accidentally dropped and rolled, and can still clamp the isolating ball 4, and can not rotate, so that the isolating ball is in an explosion-proof state. Even if the detonator 5 (either one or two of the detonator and the safety mechanism) is accidentally ignited and exploded in the fuze, the safety and arming mechanism (the explosion-proof mechanism) can ensure that the fuze can not externally generate dangerous fragments, and the detonating tube can not be detonated, namely the fuze can not accidentally ignite, and the safety in the service treatment stage, the filling stage, the in-bore movement stage and the muzzle safety distance can be ensured.

When the projectile is launched in the chamber, the bottom of the fuze body 9 has enough strength without damage and deformation.

At the initial stage of the movement of the projectile in the chamber, under the action of recoil force, the firing pin 6 compresses the self-destruction spring 7 to move downwards, the firing pin 6 does not limit the movement of the isolation ball 4, namely the ball rotor, and the recoil safety of the ball rotor is relieved. And the split ring 15 is pressed with its lower end face against the upper end face of the ball seat 14 also by the recoil force. At this time, the rotation speed of the projectile is low, and the centrifugal moment of the semi-ring of the split ring is insufficient to overcome the friction moment generated by the recoil force of the end face of the split ring, so that the split ring 5 cannot be opened.

When the projectile moves in the bore to approach the muzzle, the recoil gradually decreases and the rotational speed of the projectile gradually increases. After a certain critical point, the centrifugal ball 12 is thrown out from the radial transverse hole of the firing pin 6 under the action of centrifugal force and is clamped on the inclined plane (the contour plane of the truncated cone) of the opening of the firing pin sleeve 11 and the cylindrical surface of the inner hole of the inertia body 10. The supporting reaction force of the inclined surface of the opening part of the firing pin sleeve 11 to the centrifugal ball 12 acts on the wall of the radial transverse hole on the firing pin 6, and then the gradually weakened recoil force can be compensated for, so that the resistance of the self-destruction spring 7 is resisted. In this process, the striker 6 is always in a state of being separated from the isolation ball 4, i.e., the isolation ball 4 is completely released. After the other critical point in the same period, the split ring 15 is opened against the recoil friction moment and bending moment at the prefabricated weak part thereof under the action of the semi-ring centrifugal moment, and is thrown outwards into the annular groove reserved in the inner cavity of the ball cover 16, so that the other safety (centrifugal safety) of the ball rotor is relieved.

Whether the split ring 15 is thrown out of the chamber or outside the chamber, the safety of the ball rotor is relieved, and because the friction moment generated by the recoil load in the chamber is relatively large, the rotation of the ball rotor can be started only after the centrifugal moment of the ball rotor is larger than the friction moment after the recoil load is obviously reduced after the projectile flies out of the muzzle to approach the end of the post-effect period, and the ball rotor rotates to the alignment position beyond the safety distance of the projectile (20 m for a 35 mm caliber antiaircraft grenade), namely the needled detonator 5 at one end of the isolating ball 4 is opposite to the firing pin 6, the needled detonator 5 at the other end is opposite to the booster, the axis of the needled detonator 5 is coincident with or nearly coincident with the bullet shaft, and the fuze is in the arming state after the safety relief.

The pill can be subjected to the action of crawling overload in the post-period of flying. The creeping overload may creep the firing module forward causing the firing pin 6 to puncture the detonator 5 in the aligned isolation ball 4 causing ballistic explosion. Although the rotation speed of the projectile is very high, the centrifugal force and the friction force of the ignition module are usually very large, and the friction force is far greater than the crawling force, the centrifugal radius of the centrifugal force is random, and the centrifugal force is inevitably close to 0 or 0; in addition, the nutation force is opposite to the crawling force, so that the crawling force can be offset to some extent to help avoid ballistic explosion, but the nutation force is a periodic force and is also 0 at a certain periodic point, so that the ballistic spring 13 is necessary for preventing the ballistic explosion, and the resistance of the ballistic spring is selected according to the consideration of extreme crawling overload.

When the projectile hits a target or lands (comprising the situations of large landing angle and small landing angle), the movement of the projectile is blocked, the rotating speed also begins to decay, and the striking pin overcomes the axial component force of the constraint counter force generated by the centrifugal force of the centrifugal ball along the self-destruction inclined plane under the combined action of the forward impulsive force and the self-destruction spring resistance, and moves forwards to stab the detonator 5. At the same time, under the action of the forward thrust, the ignition module and the striking ball overcome the centrifugal friction force between the inertia body 10 and the inner wall of the fuze body 9 and the resistance of the ballistic spring 13, and carry the striking pin 6 to move forwards together to stab the detonator 5. After the ignition and explosion of the needled detonator 5, the needled detonator 5 which is arranged in the isolating ball 4 but at the other end is detonated, and then the booster charge 2 and the following main charge of the projectile are detonated. Because the mass of the ignition module and the striking ball 8 is far greater than that of the striking pin 6 plus the centrifugal ball 8, and the axial resistance of the centrifugal ball 8 along the self-destruction inclined plane is relatively large, the action of inertia triggering ignition is mainly based on the forward impact motion of the ignition module and the striking ball 8. The important function of the batting ball 8 is that the forward impact force overcomes the static friction force between the outer cylindrical surface of the inertia body 10 and the inner cavity wall of the fuze body 9, so that the forward impact motion is quickly started. The invention can be reliably triggered when being applied to 35 mm caliber antiaircraft grenades and when being hit vertically on a 2 mm thick aluminum alloy target plate.

Under the conditions of large landing angle and small landing angle, theoretically, if the action of striking the ball 8 is ignored conservatively, the fuze can realize inertial triggering ignition as long as the complementary angle or landing angle of the ball landing angle is larger than the static friction angle between the outer cylindrical surface of the inertial body 10 and the inner cavity wall of the fuze body 9. Assuming that the static friction coefficient between the outer cylindrical surface of the inertial body 10 and the wall of the inner cavity of the fuse body 9 is 0.2, the minimum firing drop angle and the maximum firing drop angle of the fuse are 11.3 degrees and 78.7 degrees theoretically respectively, and the requirements of most application occasions can be met.

Under the condition that the projectile shoots empty, if the target is not hit, in the arc-falling section of the projectile, along with the gradual attenuation of the rotational speed of the projectile, the centrifugal force of the centrifugal ball 8 is gradually reduced until a certain critical point, and the supporting reaction force generated along the self-destruction inclined plane is insufficient to support the resistance of the self-destruction spring 7, the self-destruction spring 7 can push the firing pin 6 to move forwards, and the detonator 5 is pierced to realize the centrifugal self-destruction in the air.

If the ball rotor fails to rotate for reasons (this is one of the reliable failure modes of the ball rotor mechanism), after the projectile hits the target or the air self-destruction critical point, the firing pin 6 is reinserted into the blind hole of the isolation ball 4 under the action of the forward impact force of the firing module and the striking ball 8 or the forward impact force of the firing pin and its centrifugal ball and/or the resistance of the self-destruction spring 7, and the fuze enters a state of restoring the squat insurance. Such non-explosive drugs, the explosive handling safety can be fundamentally ensured.

If the ball rotor has started the turning process but has not turned into place for reasons (this situation is also one of the reliable failure modes of the ball rotor mechanism), after the air self-destruction critical point, especially after the projectile hits the target, the striker tip will be damaged to a different extent by hitting the surface of the isolating ball 4, the fuze enters the self-failure state, which ensures the explosive handling safety to a certain extent.

The invention discloses a mechanical triggering fuze for the bottom of a grenade of a line bore artillery, which meets the related requirements of GJB373B-2019 fuze safety design criterion standard, and specifically comprises explosion suppression, redundant insurance, delay release, application of allowable explosion transfer medicine, non-release insurance state assurance, failure rate of a safety system, manual non-release insurance, self-destruction, self-failure and the like.

Claims

1. The utility model provides a line bore artillery grenade warhead machinery trigger fuse which characterized in that: comprises a detonating tube, a safety and release mechanism, a ballistic spring (13), a firing mechanism and a striking ball (8) which are coaxially arranged in the inner cavity of the fuze body (9) from top to bottom; the booster tube comprises a booster tube shell (1), booster drugs (2) and a reinforcing cap (3), wherein the booster drugs (2) are arranged in the booster tube shell (1), the opening of the booster tube shell (1) is downward, and the opening end is sealed through the reinforcing cap (3); the safety and arming mechanism comprises an isolating ball (4), a ball seat (14), an opening ring (15), a ball cover (16) and two acupuncture detonators (5), wherein the ball seat (14) and the ball cover (16) form a containing and moving chamber of the ball rotor together; the isolating ball (4) is a main explosion-proof piece, the left side and the right side of the isolating ball are respectively provided with a first blind hole, the two first blind holes are coaxial, the axis of the two first blind holes passes through the center of sphere, each first blind hole is internally provided with a needling detonator (5), the isolating ball (4) is also provided with a second blind hole facing the center of sphere, and the second blind holes are perpendicular to the first blind holes; the isolating ball (4) and the needling detonator (5) form a ball rotor, the opening ring (15) is a centrifugal safety piece of the ball rotor and is clamped at the outer side of a crescent groove at the lower end of the isolating ball (4), so that centrifugal safety of the isolating ball (4) is realized; the explosion-propagation tube shell (1) and the ball cover (16) are connected with the inner cavity of the fuze body (9) through threads; the ignition mechanism comprises a firing pin (6), a self-destruction spring (7), an inertia body (10), a firing pin sleeve (11) and a plurality of eccentric centrifugal balls (12) which are coaxially arranged, and is used for realizing inertial triggering ignition or centrifugal self-destruction ignition, wherein the inertia body (10) and the firing pin sleeve (11) are riveted, the firing pin tip of the firing pin (6) is clamped in a second blind hole of the isolation ball (4) after extending upwards from the firing pin sleeve (11) to realize recoil insurance of the isolation ball (4), the self-destruction spring (7) is arranged between the bottom surface of the firing pin (6) and the bottom surface of the inner cavity of the inertia body (10), the ballistic spring (13) is sleeved on the outer walls of the firing pin (6) and the firing pin sleeve (11), and two ends of the ballistic spring (13) respectively support against the ball seat (14) and the inertia body (10).

2. The line bore artillery grenade warhead mechanical trigger fuze of claim 1, wherein: the ball seat (14) is provided with a plurality of through holes along the axial direction, is a peeping hole used for observing whether the split ring is neglected to be installed and whether the position of the isolation ball (4) is correct in the assembly process, is also an internal pressure release channel of a high-temperature high-pressure gas product formed by accidental ignition and explosion of the detonator in the explosion-proof state, and is beneficial to improving the explosion-proof safety of the detonator.

3. The line bore artillery grenade warhead mechanical trigger fuze of claim 1, wherein: the inner cavity of the fuze body (9) is in a stepped hole shape, the outer part is large, the inner part is small, and the innermost step is matched with the inertial body (10) to thicken the tool retracting part of the fuze body (9) so as to improve the strength of the fuze body in the process of launching, target collision and target penetration.

4. The line bore artillery grenade warhead mechanical trigger fuze of claim 1, wherein: the striking ball (8) is arranged between the bottom of the fuze body (9) and the inertia body (10), the axial movement of the original striking block sliding mode is replaced by the rolling of the striking ball (8), the friction force is small, the problem that the guide is short and easy to lock is solved, the energy loss of the inertia forward stroke of the fuze inertia trigger mechanism when the fuze inertia trigger mechanism is used for triggering is greatly reduced, and the fuze inertia trigger sensitivity is improved.

5. The line bore artillery grenade bottom mechanical trigger fuze of claim 4, wherein: the striking ball (8) is a tungsten alloy ball with the diameter error within the range of +/-0.01 mm, so that the inertial forward-punching quality is improved, and the inertial triggering sensitivity of the fuze is improved.

6. The line bore artillery grenade bottom mechanical trigger fuze of claim 4, wherein: the ball (8) is used as a bearing rolling body with the density of 5.8g/cm ³ The ceramic ball can further reduce the friction force of rolling and sliding, thereby improving the inertia triggering sensitivity of the fuze.