CN115790296A - Grenade is with safe type time delay fuze - Google Patents

Abstract

The invention discloses a safety type time delay fuse for grenades, which comprises a body, an impact fire cap, a firing pin, a turning plate, a rotating shaft, a torsion spring, a holding piece, a safety pin, a safety ring, a flame-proof bolt, a flame-proof solenoid and a insensitive flame delay detonator, and meets the requirements of GJB3194-1998 'design criteria for safety of manually laid weapons'. Before throwing, the explosion-proof bolt and the explosion-proof solenoid between the sensitive impact fire cap and the insensitive flame delay detonator are respectively screwed off from two sides according to different screwing directions, the fuse is relieved, and the grenade is in a state to be thrown. After the safety ring is pulled down, the safety pin is pulled out, the safety of the holding piece is relieved, and the holding piece is still held on the bullet body by fingers. After throwing, the holding piece falls off, the firing pin on the turning plate rotates around the rotating shaft under the action of the torsional spring, the firing cap is struck and impacted to fire, the insensitive flame delay detonator is triggered, and the main charge in the bomb body is ignited after the insensitive flame delay detonator is ignited by preset delay. The invention has the advantages of simple and compact structure, short exposed projectile body part and low cost.

Description

Grenade is with safe type time delay fuze

Technical Field

The invention belongs to the fuse technology, and particularly relates to a safety type time delay fuse for grenades.

Background

The grenades and their fuse uses require manual operations, so the safety design requirements for grenade fuses are different from the general fuse safety design criteria, namely national military standard GJB373B-2019 and American military standard MIL-STD-1316F, and are special manual weapon safety design criteria, namely national military standard GJB3194-1998 and American military standard MIL-STD-1911. The two standards, namely the safety design rule of manually laying weapons, are almost the same as the safety design rule of fuzes except for the specific provisions of redundant insurance requirements. However, from the American military standard manual MIL-HDBK-145C overview of active fuze, the 17 listed types of grenade fuze do not meet the requirements of MIL-STD-1911 safety design criteria of manually laying weapons, including the most basic requirements of explosion-proof safety and redundancy insurance. In recent years, domestic existing products are developed according to the requirements of GJB3194-1998 safety design criteria for manually laying weapons, and can meet the requirement of explosion-proof safety, but some products cannot further meet the requirement of redundant insurance, and some products have too complex structures, are inconvenient to operate and use and have higher cost. Furthermore, the fuze is exposed to the body part for a long time, which makes it difficult to make the grenade have a spherical shape or a shape close to a spherical shape, so that the resistance when the grenade is thrown in different directions (postures) or when the grenade flies in different postures in the air is greatly different, which causes a large spread of the shot point, and the accuracy and precision requirements of the predetermined attack or the impact point defense are difficult to meet (see: wang Yushi, wu Bochong, wen Quan, etc.. The stockless grenade and the fuze thereof are designed by ballistic characteristics analysis 2015, the bulletin and guidance bulletin, 5 th year, pages 57-60).

Chinese patent CN102466435A is a grenade fuze, a paper is electromechanical grenade fuze research (Li Ning, qixingling, cui Ping, etc. 'Sichuan war institute of technology', 5 th 2007), a paper is a grenade electronic trigger fuze using a magneto generator (Sun Zhongsheng, guo Junxian, hao Yimin, etc. 'detection and control academic, 2 nd 2010), and a paper is a digital grenade fuze research and design (Zhou Mingan, guostian, 62 zxft 3262, etc.' Sichuan institute of technology, 8 th 2014), all of which do not relate to the safety requirements (such as safety and safety insurance implementation) specified in GJB3194-1998 manually laid weapon safety design criteria (Zhou Mingan, guoshan Tiantian, cheng Xiaodong, etc.). The safety mechanism of the grenade fuse is disclosed in Chinese patent CN102278917A, namely the service safety mechanism of the grenade fuse, and Chinese patent CN102374831A, namely the safety mechanism of the grenade fuse, and does not relate to the safety requirements specified in GJB3194-1998 safety design criteria of manually laying weapons, such as explosion-proof safety and redundant safety.

Disclosure of Invention

The invention aims to provide a safety type time delay fuse for a grenade, which has the characteristics of simple structure, low cost and redundancy insurance, and the exposed fuse body part is shorter, so that the aerodynamic symmetry of the grenade cannot be obviously influenced, and the safety type time delay fuse is further beneficial to improving the throwing accuracy and precision during attack and defense battles.

The technical solution for realizing the purpose of the invention is as follows: a safety time-delay fuse for grenades, which has simple structure, low cost and redundant safety characteristic, comprises a body, an ignition module, a safety module, an explosion-proof module and a insensitive flame delay detonator module. The structure and principle of the ignition module and the safety module are basically the same as those of the existing delay fuse (such as American M201 series fuse) for the grenade, and the delay fuse comprises a firing pin, a turning plate, a rotating shaft, a torsion spring, a holding piece, a safety pin and a safety ring, so that the actions of pulling the pin and tightly holding the holding piece before throwing are kept unchanged, and the use requirements of a user can be quickly and skillfully mastered by the user. The difference is that an explosion-proof module is additionally arranged between an ignition module and a insensitive flame delay detonator module, so that an explosion-proof bolt, an explosion-proof solenoid and a sensitive impact fire cap are additionally arranged, the original sensitive impact delay detonator is correspondingly changed into the insensitive flame delay detonator, and the main body is modified adaptively according to a new structure and basically has the same main structure as the existing delay detonator body for the grenade.

The body is the main structure of the fuse and is provided with a thread connected with the projectile body. The outer contour of the body is in a rotary body shape by taking the axis of the thread as a symmetrical line; the body is provided with a five-step through hole along the axis, namely a first step hole, a second step hole, a third step hole, a fourth step hole and a fifth step hole from top to bottom, namely from outside to inside; the body is provided with a third-order through hole along the radial direction, the third-order through hole is vertically communicated with a fourth-order hole, the third-order through hole sequentially comprises a sixth-order hole, a seventh-order hole and an eighth-order hole, and the sixth-order hole and the eighth-order hole are symmetrically distributed; a first transverse hole parallel to the sixth-step hole is formed in the position, which is on the body, is deviated from the axis and corresponds to half of the depth of the first-step hole; a second transverse hole parallel to the first transverse hole is arranged at the outer side of the first transverse hole and near the position corresponding to half of the depth of the second step hole; a cantilever-shaped bulge parallel to the first transverse hole is arranged at the outer edge of the body and at the other side symmetrical to the first transverse hole; the ignition module is positioned in the first-step hole and the third-step hole; the explosion-proof module is arranged in the third-order through hole; the insensitive delay detonator is positioned in the fifth-order hole, and the safety module is utilized to realize safety on the ignition module.

A sensitive impact fire cap is arranged in a third step hole of the body, a rotating shaft of a firing module is arranged in a first transverse hole of the body, and the firing module is distributed around the first transverse hole; the safety pin in the safety module of the ignition module is installed in the second transverse hole of the body, and the safety module of the ignition module is arranged around the second transverse hole.

Compared with the existing non-explosion-proof delay fuse for the grenade, such as the American M201 series fuse, the method is equivalent to the method that the original sensitive impact delay detonator is divided into two parts used in series: namely the input end becomes a sensitive impact fire cap, and the delay and output ends are sealed and insensitive flame delay detonators; an explosion-proof mechanism (explosion-proof component) is additionally arranged between the sensitive impact fire cap and the insensitive flame delay detonator, namely an explosion-proof solenoid and an explosion-proof bolt which release the safety (screw out) by the manual action of different rotating directions; before the throwing type explosion-proof bolt is used, an explosion-proof solenoid and an explosion-proof bolt are respectively screwed out from two sides, and the safety is relieved firstly; the insensitive flame delay detonator is a permissible in-line explosive with the sensitivity not higher than that of Tetoron.

Furthermore, the safety module comprises a holding piece, a safety pin and a safety ring, the safety pin and the safety ring are flexibly combined together, and the safety pin penetrates through a preformed hole in the holding piece and is inserted into a second transverse hole in the body so that the holding piece is fixed on the body; the main body part of the holding piece is attached to the outer wall surface of the projectile body, simultaneously, the firing pin of the firing module is blocked to be in a safety state, and the hook at the front end of the holding piece is hooked on the cantilever-shaped bulge of the projectile body.

Furthermore, the ignition module comprises a rotating shaft, a torsion spring, a striker, a turning plate and an impact fire cap besides the body; the rotating shaft is arranged in the first transverse hole of the body; the torsion spring is sleeved on the rotating shaft after being pre-twisted, one end of the torsion spring is pressed on the turning plate, and the other end of the torsion spring is fixed by the body; the firing pin is fixed on the turnover plate in a riveting mode, and the firing end of the firing pin is hemispherical; the striking cap is riveted and fixed in the third step hole of the body.

Furthermore, the explosion-proof module comprises two sets of explosion-proof mechanisms besides the body, a set of explosion-proof mechanism is respectively arranged in the sixth-order hole and the eighth-order hole, each explosion-proof mechanism comprises an explosion-proof bolt and an explosion-proof solenoid, and the explosion-proof bolts and the explosion-proof solenoids are both in a revolving body configuration; the explosion-proof bolt and the explosion-proof solenoid are respectively positioned in the sixth-order hole, the eighth-order hole and the seventh-order hole of the body, are connected with the holes in which the explosion-proof bolt and the explosion-proof solenoid are positioned in a threaded manner, are respectively screwed in from two sides, and are locked by a preset screwing torque; the outer end surfaces of the explosion-proof bolt and the explosion-proof solenoid are not higher than the surface of the orifice, so that the safety reliability of the explosion-proof bolt and the explosion-proof solenoid is facilitated; any one of the explosion-proof bolt and the explosion-proof solenoid can independently meet the requirement of explosion-proof safety on the premise of not depending on the existence of the other one.

Further, the insensitive delay detonator module comprises a tube shell, and a reinforcing cap, a high explosive, an ignition powder, a delay powder, a barrier sheet and an ignition powder which are sequentially arranged in the tube shell along the direction from the output end to the input end, wherein the mouth part of the insensitive delay detonator is downwards riveted in a fifth-order hole; wherein the sensitivity of all the explosive charges such as high explosive, ignition powder, delay powder and the like is not higher than that of the special propellant; if a combustion output is desired, the high explosive therein may be replaced with a non-sensitive ignition charge.

Compared with the prior art, the invention has the following remarkable advantages:

(1) The overall dimension, the quality and the dimension of the interface with the warhead of the existing fuse do not need to be changed, and the main operation and use steps are not changed.

(2) Two sets of independent explosion-proof mechanisms are additionally arranged, and the related requirements specified by GJB3194-1998 safety design criteria for manually laying weapons, such as explosion-proof safety and redundant insurance, are met.

(3) Compact and simple structure, good producibility of parts and low cost.

(4) After the insensitive detonator shell is thickened, reinforced and coated with a heat insulating material, the requirement of insensitivity, namely low vulnerability can be met.

(5) The impact ignition principle is adopted, and the requirement on the safety of explosive treatment of the unexplosive explosive can be met.

Drawings

Fig. 1 is a sectional view (front view) of the safety delay fuse for grenades according to the present invention along the symmetrical plane of the structure.

Wherein 1 is a body, 2 is an impact fire cap, 3 is a firing pin, 4 is a turning plate, 5 is a rotating shaft, 6 is a torsion spring, 7 is a holding sheet, 8 is a safety pin, 10 is an explosion-proof bolt, 11 is an explosion-proof solenoid, 12 is a insensitive flame delay detonator, 121 is a reinforcing cap, 122 is insensitive ignition powder or insensitive explosive, 123 is insensitive delay powder or insensitive ignition powder, 124 is insensitive delay powder, 125 is a blocking sheet, 126 is insensitive ignition powder, and 127 is a tube shell.

Fig. 2 is a top view of the safety type time delay fuse for the grenade according to the present invention.

Figure 3 is a cross-sectional view (left side view) of a safety delay fuse for a grenade according to the invention, taken through the centre axis and perpendicular to the plane of symmetry, before the safety pin and safety ring are assembled.

Fig. 4 is a projection view of the safety type time delay fuse for grenades according to the present invention along a direction perpendicular to the symmetry plane, wherein 9 is a safety ring.

Figure 5 is a right side view of a safety delay fuse for a grenade according to the invention before assembly of the grip, the safety pin and the safety 9.

Detailed Description

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

With reference to fig. 1 to 5, the safety type time delay fuse for the grenades comprises a body 1, a safety module, an ignition module, an explosion-proof module and a insensitive flame delay detonator 12, wherein the safety module, the ignition module, the explosion-proof module and the insensitive flame delay detonator 12 are all used as functional modules. The structure and principle of the ignition module and the safety module are basically the same as those of the existing delay fuse for the grenade (such as American M201 series fuse), and the delay fuse comprises a firing pin 3, a turning plate 4, a rotating shaft 5, a torsion spring 6, a holding piece 7, a safety pin 8 and a safety ring 9, so that the actions of pulling out the safety pin 8 and tightly holding the holding piece 7 just before throwing are kept unchanged, and the use requirements are rapidly and skillfully mastered by a user. The difference is that an explosion-proof module is additionally arranged between an ignition module and a delay detonator module, so that an explosion-proof bolt 10, an explosion-proof solenoid 11 and a sensitive impact fire cap 2 are additionally arranged, the sensitive impact delay detonator is correspondingly changed into a insensitive flame delay detonator 12, and the body 1 is adaptively modified according to a new structure and is basically the same as the existing delay detonator body for the grenade.

The body 1 is the main structural component of the fuse and is provided with a thread for connecting the projectile body. The outer contour of the body 1 is in a shape of a revolution body by taking the axis of the thread as a symmetrical line; the body 1 is provided with a five-step through hole along the axis, and the five-step through hole is a first step hole, a second step hole, a third step hole, a fourth step hole and a fifth step hole from top to bottom; a third-order through hole is formed in the body 1 in the radial direction and is vertically communicated with a fourth-order hole, the third-order through hole sequentially comprises a sixth-order hole, a seventh-order hole and an eighth-order hole, and the sixth-order hole and the eighth-order hole are symmetrically distributed; the sixth-order hole and the eighth-order hole are provided with internal threads, the major diameters and the thread pitches of the threads are the same, but the rotating directions are opposite; a first transverse hole parallel to the sixth-step hole is formed in the position, which is on the upper side of the body 1, is deviated from the axis and corresponds to half of the depth of the first-step hole; a second transverse hole parallel to the first transverse hole is arranged at the outer side of the first transverse hole and near the position corresponding to half of the depth of the second step hole; a cantilever-shaped bulge parallel to the first transverse hole is arranged at the other side symmetrical to the first transverse hole and the outer edge of the body 1.

A first-order hole and a second-order hole of the body 1 are used for providing a motion space for a firing pin 3 which does overturn firing motion along with a turning plate 4, a sensitive impact fire cap 2 is arranged in the third-order hole with the input end facing upwards, an explosion-proof module is arranged in the fourth-order hole, and a insensitive flame delay detonator 12 is arranged in the fifth-order hole; a rotating shaft 5 of the ignition module is arranged in a first transverse hole of the body, and the ignition module is distributed around the first transverse hole; the safety pin 8 in the safety module of the ignition module is arranged in the second transverse hole of the body, and the safety module of the ignition module is arranged around the second transverse hole.

Compared with the existing delay fuses for non-explosion-proof grenades, such as American M201 series fuses, the method is equivalent to the method that the original sensitive impact delay detonator is divided into two parts which are used in series: i.e. the input end becomes sensitive to strike the fire cap 2, and the delay and output ends are sealed and insensitive flame delay detonators 12. An explosion-proof mechanism (explosion-proof component) is additionally arranged between the sensitive impact fire cap 2 and the insensitive flame delay detonator 12, namely an explosion-proof bolt 10 and an explosion-proof solenoid 11 which release the safety (screw-out) by the manual action of different screw directions. Before the throwing type explosion-proof bolt is used, the explosion-proof bolt 10 and the explosion-proof solenoid 11 need to be screwed out respectively, and the safety is relieved firstly. The insensitive flame delay detonator 12 is a permissible in-line explosive with the sensitivity not higher than that of Tetoron.

Further, the safety module comprises a holding sheet 7, a safety pin 8 and a safety ring 9 besides the body 1; the safety pin 8 and the safety ring 9 are flexibly combined together, and the safety pin 8 passes through a preformed hole on the holding piece 7 and is inserted into a second transverse hole on the body 1, so that the holding piece 7 is fixed on the body 1; the safety pin 8 is a split pin, and the open end of the safety pin is slightly opened after penetrating through the body 1 and the holding piece 7, so that safety is realized; when the safety ring 9 is used for throwing, the pulling force is large enough, the opening of the safety pin 8 is folded by means of the openings on the body 1 and the grip piece 7, and the safety pin is pulled out from the body 1 and the grip piece 7 to complete the relief; a boss is arranged on the side surface of the body 1; the safety ring 9 is turned over and buckled on the boss of the body 1 at ordinary times to realize positioning and prevent a user from accidentally taking the safety pin 8 out due to credible tactical actions, and the safety ring 9 needs to be pulled out from the positioning boss of the body 1 by bare hands before use; the main body part of the holding sheet 7 is abutted against the outer contour surface of the projectile body, and simultaneously, the firing pin 3 of the firing mechanism is blocked and is in a safe state, and the hook at the front end of the firing pin is hooked on the cantilever-shaped bulge of the body 1.

Further, the ignition module comprises an impact fire cap 2, a firing pin 3, a turning plate 4, a rotating shaft 5 and a torsion spring 6 besides the body 1; the rotating shaft 5 is arranged in the first transverse hole of the body 1 and is fixed in a spot riveting or bonding mode and the like; the torsion spring 6 is pre-twisted and then sleeved on the rotating shaft 5, one end of the torsion spring 6 is pressed on the turning plate 4, and the other end of the torsion spring is fixed by the body 1; the firing pin 3 is fixed on the turning plate 4 in a riveting mode, and the firing end of the firing pin is hemispherical; the input end of the sensitive impact fire cap 2 is outwards riveted and fixed in a third step hole of the body 1 through a point.

Furthermore, the explosion-proof module comprises two sets of explosion-proof mechanisms besides the body 1, a set of explosion-proof mechanism is respectively arranged in the sixth-order hole and the eighth-order hole, each explosion-proof mechanism comprises an explosion-proof bolt 10 and an explosion-proof solenoid 11, and both the explosion-proof bolt 10 and the explosion-proof solenoid 11 are in a revolving body configuration; the explosion-proof mechanism is characterized in that an explosion-proof bolt 10 and an explosion-proof solenoid 11 are respectively positioned in a sixth-order hole, an eighth-order hole and a seventh-order hole of the body 1, are connected with the holes in which the explosion-proof bolt and the explosion-proof solenoid are positioned in a threaded manner, are respectively screwed in from two sides and are locked by a preset screwing torque; wherein the front end of the explosion-proof bolt 10 extends into the reserved groove of the explosion-proof solenoid 11; the outer end surfaces of the explosion-proof bolt 10 and the explosion-proof solenoid 11 are not higher than the surface of the hole openings, so that the safety reliability of the explosion-proof bolt 10 and the explosion-proof solenoid 11 is facilitated; any one of the explosion-proof bolt 10 and the explosion-proof solenoid 11 can independently realize the requirement of fuze explosion-proof safety on the premise of not depending on the existence of the other one, namely, on the premise of existence of any one of the explosion-proof bolt 10 and the explosion-proof solenoid 11, the sensitive impact fire cap 2 is accidentally ignited, and the insensitive flame delay detonator 12 cannot be accidentally triggered.

Further, the insensitive delay detonator module 12 comprises a tube shell 127, a reinforcing cap 121, a high explosive 122, an ignition powder 123, a delay powder 124, a barrier sheet 125 and an ignition powder 126 which are sequentially arranged in the tube shell 127 along the direction from the output end to the input end, wherein the mouth part of the insensitive delay detonator 12 is riveted downwards in a fifth-order hole; wherein the sensitivity of all the explosive charges such as insensitive high explosive, insensitive ignition powder, insensitive delay powder and the like is not higher than that of the explosive charges; if the combustion output is needed, the insensitive high explosive in the fuel can be replaced by insensitive ignition powder; the insensitive delay detonator 12 is triggered by the weak detonation output by the sensitive impact fire cap sensed by the input end; the input end of a closed structure, namely the terminating end of the tube shell 127 is arranged at the output end, so that the explosion-proof safety is improved; the barrier piece 125 is used for attenuating the input energy of the sensitive impact fire cap 17, and ensures the delay stability of the insensitive flame delay detonator 12.

The insensitive high explosive can be mixed explosive dull black-5 (A5), poly-ao-9 (PBXN-5) or Hexanitrostilbene (HNS). The insensitive ignition charge may be a boron/potassium nitrate ignition charge. The insensitive time delay agent can be a tungsten time delay agent taking diatomite and shellac varnish as insensitive agents (the proportions of the insensitive agents are about 37.6 percent of tungsten powder, 10.6 percent of potassium perchlorate and 51.8 percent of barium chromate when no insensitive agent is contained).

The invention has the innovation point that two sets of mutually independent 'plug screw' explosion-proof mechanisms are arranged in the middle of an explosion sequence on the premise of not changing the appearance, the quality, the cartridge interface and the main using operation steps of the fuze, so that the detonation transmission and the grenade accidental explosion possibly caused by the accidental ignition of sensitive explosive elements are blocked, and the safety of storage, transportation and use is ensured. The exposed height is not increased, so that the balance of the quality characteristic and the aerodynamic characteristic of the grenade is facilitated, and the throwing accuracy is not influenced. Inherits the principle of striking and firing, and can ensure the safety of explosive treatment of unexploded ammunition. The structure is simple and the cost is low.

The safety type time-delay fuse for the grenade has the following main safety principle:

during service treatment, the fuse is in an explosion-proof state, namely a factory assembly state, and the impact, vibration and falling of the fuse can not cause the accidental action of the fuse.

The explosion-proof bolt 10 and the explosion-proof solenoid 11 are screwed in a transverse Kong Jidi sixth-order hole and an eighth-order hole in the middle of the body 1 from two ends respectively through threads, and the initiation effect of the sensitive impact fire cap 2 on the insensitive flame delay detonator 12 is blocked. And the accuracy and the credibility of the position of the explosion-proof bolt 10 and the explosion-proof solenoid 11 are ensured by the tightening torque and the structural axial symmetry characteristic (the center of mass is positioned on the axis). At the moment, even if the sensitive impact fire cap 2 is accidentally fired, the insensitive flame delay detonator 12 positioned below the explosion-proof bolt 10 and the explosion-proof solenoid 11 can not be triggered to further trigger the charging in the warhead of the grenade.

The opening-shaped safety pin 8 sequentially penetrates through the holding piece 7 and the body 1, so that the holding piece 7 is protected on the body 1, the holding piece 7 blocks the firing pin 3, the safety pin 8 also blocks the turning plate 4 so as not to turn over, the opening end of the safety pin 8 is slightly opened to realize safety, and the fuze ignition mechanism is in a safety state. The safety ring 9 is turned over and buckled on a boss on the side surface of the body 1 at ordinary times, and a certain magnitude of interference is arranged to generate elastic tension to prevent a user from accidentally bringing out the safety pin 8 due to credible tactical actions. Under the credible service processing environment such as vibration, unexpected fall and the like, the fuse can still be kept in the insurance state.

The insensitive flame delay detonator 12 adopts a structure with a closed input end and a closed output end, so that a potential fire transfer path of a fuse in an explosion-proof state is avoided, and the explosion-proof safety is improved.

The safe separation of the grenade from the thrower requires that the firing control delay be implemented by a blunted flame delay detonator 12.

The shell 127 is made of high-strength steel and has a thick wall thickness, so that the insensitive flame delay detonator 12 has the insensitive characteristic, namely the low-vulnerability characteristic, and can bear extreme environments such as fast baking, slow baking, gunshot, fragment striking, jet impact and the like while reliably realizing the combustion-to-detonation transition. The shell 127 is coated with a certain amount of thermal insulation and cushioning material on the inside and outside to help achieve the insensitivity, i.e., low vulnerability.

The fuze is ignited by adopting an impact ignition principle that a firing pin strikes a sensitive impact fire cap, the energy required by ignition is large, the sensitive impact fire cap is formed by a plurality of hot spots, and the reliability is high. In case of misfire, the striker 3 will not make the sensitive impact cap 2 to reignite after the accidental environmental impact such as vibration, fall and the like in credible transportation. Therefore, the principle of percussion ignition is inherited instead of the principle of needling ignition with low ignition energy, and the original better explosive treatment characteristic of the unexploded ammunition is kept.

The safety type time-delay fuse for the grenade has the following working process:

before the fuse is used, a miniature special wrench or a temporary coin is used for screwing the explosion-proof bolt 10 and the explosion-proof solenoid 11 off the fuse, and the fuse is relieved.

Before throwing, after holding the grip tab 7, the safety ring 9 with its associated safety pin 8 is pulled out of the grenade. Before throwing, the holding piece 7 should be always held and cannot be loosened. The grenade throws out the hand and instantly releases the holding piece 7. After throwing, the holding sheet 7 falls off in the air under the pushing of the turning plate 4 and the action of air resistance, the torsion spring 6 rotates around the rotating shaft 5, the turning plate 4 drives the firing pin 3 to rotate along with the striking force to strike the sensitive impact fire cap 2 to fire, then the insensitive ignition powder 126 in the insensitive flame delay detonator 12 is triggered, the generated flame passes through the barrier sheet 125 to ignite the insensitive delay powder 124, the insensitive delay powder 124 is combusted in a delay mode for a plurality of seconds, then the combustion of the insensitive ignition powder 123 is converted into the detonation effect, and finally the high explosive 122 is detonated, so that the grenade explodes.

Claims (5)

1. The utility model provides a grenade is with safe type time delay fuze which characterized in that: the flame-retardant explosion-proof safety device comprises a body (1), a safety module, an ignition module, an explosion-proof module and an insensitive flame delay detonator (12); a fifth-step through hole is formed in the top surface of the body (1) along the axis and is a first-step hole, a second-step hole, a third-step hole, a fourth-step hole and a fifth-step hole from top to bottom; a third-order through hole is formed in the body (1) in the radial direction and is vertically communicated with a fourth-order hole, the third-order through hole sequentially comprises a sixth-order hole, a seventh-order hole and an eighth-order hole, and the sixth-order hole and the eighth-order hole are symmetrically distributed; a first transverse hole parallel to the sixth-step hole is formed in the position, which is on the upper side of the body (1), of the axis and corresponds to half of the depth of the first-step hole; a second transverse hole parallel to the first transverse hole is arranged at the outer side of the first transverse hole and near the position corresponding to half of the depth of the second step hole; a cantilever-shaped bulge parallel to the first transverse hole is arranged at the other side symmetrical to the first transverse hole and at the outer edge of the body (1); the ignition module is positioned in the first-step hole and the third-step hole; the explosion-proof module is arranged in the third-order through hole; the insensitive delay detonator (12) is positioned in the fifth-order hole, and the safety module is used for realizing safety on the ignition module.

2. The safety delay fuse for the grenades according to claim 1, characterized in that: the ignition module comprises a rotating shaft (5), a torsion spring (6), a firing pin (3), a turning plate (4) and an impact fire cap (2); the rotating shaft (5) is arranged in the first transverse hole of the body (1); the torsion spring (6) is sleeved on the rotating shaft (5) after being pre-twisted, one end of the torsion spring (6) is pressed on the turning plate (4), and the other end of the torsion spring (6) is fixed by the body (1); the firing pin (3) is fixed on the turning plate (4) in a riveting mode, and the firing end of the firing pin is hemispherical; the striking fire cap (2) is fixed in a third-order hole of the body (1) through riveting.

3. The safety delay fuse for the grenades according to claim 2, characterized in that: the safety module comprises a holding piece (7), a safety pin (8) and a safety ring (9), the safety pin (8) and the safety ring (9) are flexibly combined together, and the safety pin (8) penetrates through a preformed hole in the holding piece (7) and is inserted into a second transverse hole in the body (1) to fix the holding piece (7) on the body (1); the main body part of the holding piece (7) is attached to the outer wall surface of the projectile body, meanwhile, the firing pin (3) of the firing module is blocked to be in a safety state, and the hook at the front end of the holding piece (7) is hooked on the cantilever-shaped bulge of the projectile body (1).

4. The safety delay fuse for the grenades according to claim 3, characterized in that: the explosion-proof module is arranged below the impact fire cap (2), the explosion-proof module comprises two sets of explosion-proof mechanisms, a set of explosion-proof mechanism is arranged in the sixth-order hole and the eighth-order hole respectively, the explosion-proof mechanism comprises an explosion-proof bolt (10) and an explosion-proof solenoid (11), the explosion-proof mechanism, the explosion-proof bolt (10) and the explosion-proof solenoid (11) are connected with the holes in which the explosion-proof bolt and the explosion-proof solenoid are arranged in a threaded mode, and self locking is realized by a preset tightening torque; and the outer end surfaces of the explosion-proof bolt (10) and the explosion-proof solenoid (11) are not higher than the surfaces of the orifices, so that the safety reliability of the explosion-proof bolt (10) and the explosion-proof solenoid (11) is facilitated.

5. The safety delay fuse for the grenades according to claim 1, characterized in that: the insensitive delay detonator (12) comprises a tube shell (127), a reinforcing cap (121), a high explosive (122), an ignition powder (123), a delay powder (124), a separation sheet (125) and an ignition powder (126), wherein the reinforcing cap, the high explosive (122), the ignition powder (123), the delay powder (124), the separation sheet (125) and the ignition powder (126) are sequentially arranged in the tube shell (127) along the direction from the output end to the input end, and the mouth part of the insensitive delay detonator (12) is downwards riveted and arranged in a fifth-order hole.

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