Large-overload-resistant inertia mechanical safety mechanism

Abstract

The invention discloses a large-overload-resistant inertia mechanical safety mechanism which comprises a safety base, and a recoil safety mechanism is installed on the safety base and used for sensing flight overload. An explosion-proof wheel is rotationally installed on the safety base, an eccentric wheel is further rotationally installed on the safety base, the axis of the explosion-proof wheel and the axis of the eccentric wheel are in the same direction, the eccentric wheel and the sliding block are jointly provided with a locking structure, and the locking structure is used for controlling rotation or locking of the explosion-proof wheel; and the safety of the projectile and the launching platform is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of fuze safety mechanisms, in particular to a large overload resistant inertia mechanical safety mechanism. Background Art

[0002] The fuze is a supporting product of the ammunition system. Its main functions are: it is in a safe state during the ground service processing and the initial stage of the flight of the projectile. After the projectile is launched, the safety is released according to the launch flight environment information, and the fuze is activated by receiving the firing signal. Fuzes are mechanical, electromechanical, and fully electronic. Electromechanical fuzes are generally composed of inertial mechanical safety mechanisms, electrical safety mechanisms, explosion-proof mechanisms, explosion transmission sequences, sensitive devices, and shells. They have the characteristics of mature technology and low cost, and are used in a large number of ammunition systems. In order to ensure the safety of the projectile, the inertial mechanical safety mechanism uses the inertial force of the projectile launch flight to release the safety, and the electrical safety mechanism uses electrical signals to release the safety after the projectile flies away from a safe distance.

[0003] In the prior art, a Chinese patent document with publication number CN114111471B discloses a multi-way parallel electromechanical trigger fuze for a rotating rocket warhead, wherein a recoil safety mechanism is provided, which is a sequential release safety type recoil safety mechanism, axially arranged at an eccentric position of the body, and is composed of two sets of spring-mass systems arranged in parallel; the intermediate safety component is arranged at an eccentric position of the body, used to realize the insurance of the isolation ball, and is limited to the safety position by the recoil safety mechanism. The trigger fuze does not have the ability to resist large overloads; the projectile is loaded with explosives, and the safety of the projectile is extremely important. Even in the case of abnormally large acceleration and falling, the fuze should not be released to ensure the safety of the projectile and the launch platform. When the acceleration of the projectile increases abnormally or falls, it will produce an acceleration much greater than normal operation. The existing inertial safety mechanism cannot guarantee the safety of the projectile and the launch platform under abnormal acceleration conditions and falling conditions. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a mechanical safety mechanism capable of resisting large overload inertia.

[0005] The present invention is achieved through the following technical solutions.

[0006] The invention provides a large overload resistant inertia mechanical safety mechanism, comprising a safety base, on which a recoil safety mechanism is mounted, the recoil safety mechanism being used to sense flight overload;

[0007] An explosion-proof wheel is rotatably mounted on the safety base, and an eccentric wheel is also rotatably mounted on the safety base. The axes of the explosion-proof wheel and the eccentric wheel are in the same direction. The eccentric wheel and the slider are jointly provided with a locking structure, which is used to control the rotation or locking of the explosion-proof wheel.

[0008] Preferably, the recoil safety mechanism includes a guide rod, a first safety spring, a slider, a baffle, and a second safety spring. The guide rod is installed on the safety base, the slider is slidably arranged on the guide rod, the first safety spring is sleeved on the guide rod, the upper end of the first safety spring is connected to the lower end of the slider, the lower end of the first safety spring is connected to the upper end face of the baffle, the baffle is slidably sleeved on the guide rod, the lower end face of the baffle is connected to the upper end of the second safety spring, the lower end of the second safety spring is connected to the bottom of the safety base, and the second safety spring is sleeved on the guide rod.

[0009] Preferably, a limiting groove is formed at the bottom of the safety base, the lower end of the guide rod is installed in the limiting groove, a limiting plate is arranged at the upper opening of the limiting groove, and the baffle is limited in the limiting groove through the limiting plate.

[0010] Preferably, the elastic force of the second safety spring is greater than that of the first safety spring.

[0011] Preferably, a clamping notch is provided on the explosion-proof wheel.

[0012] Preferably, the locking structure includes an arc notch, a limiting notch, a shaft pin, and a special-shaped groove. The arc notch and the limiting notch are arranged on the outer circumference of the eccentric wheel, and the arc notch and the limiting notch are connected by an arc segment. When the arc segment is engaged with the clamping notch of the explosion-proof wheel, the explosion-proof wheel is locked.

[0013] The shaft pin is fixed on the end face of the eccentric wheel facing the slider, the special-shaped groove is arranged on the end face of the slider facing the eccentric wheel, the end of the shaft pin is slidably matched in the special-shaped groove, and the special-shaped groove controls the rotation of the eccentric wheel by restricting the movement track of the shaft pin.

[0014] Preferably, a partition frame is arranged at the middle position of the lower part of the special-shaped groove, and a first guide groove and a second guide groove are respectively formed on the left and right sides of the lower part of the special-shaped groove by the partition frame.

[0015] Preferably, a connecting block is installed on the side wall of the upper part of the special-shaped groove, and the transverse width of the connecting block is half of the width of the special-shaped groove.

[0016] Preferably, an eccentric notch is provided on the eccentric wheel, and the concave arc surface of the eccentric notch is arranged opposite to the concave arc surface of the arc notch.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. By connecting the first safety spring and the second safety spring in series and separating the first safety spring and the second safety spring by a baffle, normal flight overload and abnormal flight large overload can be identified.

[0019] 2. Through the combined cooperation of the slider, the first safety spring, the second safety spring, the baffle, the shaft pin and the connecting block, when the projectile is in normal flight acceleration, the slider moves downward under the inertial force and only compresses the first safety spring. The eccentric wheel drives the shaft pin to rotate, and the shaft pin is clamped above the first guiding groove, locking the eccentric wheel. The arc notch and the clamping notch are opposite to each other, and the explosion-proof wheel is no longer locked by the eccentric wheel, realizing the unlocking of the explosion-proof wheel and releasing the inertial mechanical safety mechanism. When abnormal acceleration or drop impact occurs, the inertial force received by the slider is greater, both the first safety spring and the second safety spring are compressed, and the slider moves downward a greater distance. At the same time, the eccentric wheel drives the shaft pin to rotate and just gets stuck on the side wall of the connecting block, realizing the locking of the eccentric wheel, thus restricting the rotation of the eccentric wheel, so that the arc segment cannot completely move out of the clamping notch, and the explosion-proof wheel remains in the locked state, and the inertial mechanical safety mechanism is not released, ensuring the safety of the projectile and the launch platform. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural view of the initial state of the present invention;

[0021] Figure 2 is a schematic structural view of the projectile in the state of normal flight acceleration in the present invention;

[0022] Figure 3 is a schematic structural view of the projectile when the flight overload drops from normal acceleration to zero in the present invention;

[0023] Figure 4 is a schematic structural view of the projectile in the state of abnormal acceleration or drop in the present invention;

[0024] In the figure: 1 - guiding rod; 2 - first safety spring; 3 - eccentric wheel; 4 - shaft pin; 5 - slider; 6 - explosion-proof wheel; 7 - safety base; 8 - baffle; 9 - second safety spring; 10 - clamping notch; 11 - arc notch; 12 - limiting notch; 13 - special-shaped groove; 14 - first guiding groove; 15 - second guiding groove; 16 - limiting groove; 17 - limiting plate; 18 - connecting block; 19 - eccentric notch. Detailed Embodiment

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] In this embodiment, referring to Figure 1 , it includes an insurance base 7, and a recoil insurance mechanism is installed on the insurance base 7. The recoil insurance mechanism includes a guide rod 1, a first insurance spring 2, a slider 5, a baffle 8, and a second insurance spring 9. The guide rod 1 is installed on the insurance base 7, the slider 5 is slidably arranged on the guide rod 1, the first insurance spring 2 is sleeved on the guide rod 1, the upper end of the first insurance spring 2 is connected to the lower end of the slider 5, the lower end of the first insurance spring 2 is connected to the upper end face of the baffle 8, the baffle 8 is slidably sleeved on the guide rod 1, the lower end face of the baffle 8 is connected to the upper end of the second insurance spring 9, the lower end of the second insurance spring 9 is connected to the bottom of the insurance base 7, and the second insurance spring 9 is sleeved on the guide rod 1.

[0028] In this embodiment, referring to Figure 1 , a limiting groove 16 is opened at the bottom of the insurance base 7, the lower end of the guide rod 1 is fixedly installed in the limiting groove 16, so that the lower end of the second insurance spring 9 is fixedly connected to the bottom of the limiting groove. A limiting plate 17 is provided at the open end of the limiting groove 16, and the baffle 8 is limited in the limiting groove 16 through the limiting plate 17. The elastic force of the second insurance spring 9 is greater than that of the first insurance spring 2, so that the pressure of the second insurance spring 9 on the baffle 8 is greater than the pressure of the first insurance spring 2 on the baffle 8. The second insurance spring 9 pushes the baffle 8 to abut against the lower end face of the limiting plate 17, limiting the baffle 8 in the limiting groove 16. At the same time, the second insurance spring 9 is also limited in the limiting groove 16 to ensure the stability of the second insurance spring 9. When the projectile is at a normal acceleration, the second insurance spring 9 is not compressed and the baffle 8 does not move.

[0029] In this embodiment, referring to Figure 1 In this embodiment, referring to Figure 1 , a first stepped hole is provided on the insurance base 7, and the shaft shoulder of the central rotating shaft of the explosion-proof wheel 6 is rotatably installed in the first stepped hole, so that the explosion-proof wheel 6 is rotatably installed on the insurance base 7. The explosion-proof wheel 6 is made of copper material. A clamping notch 10 is provided on the explosion-proof wheel 6. An eccentric wheel 3 is also rotatably installed on the insurance base 7. The eccentric wheel 3 is made of copper material. An eccentric notch 19 is provided on the eccentric wheel 3. The concave arc surface of the eccentric notch 19 and the concave arc surface of the arc notch 11 are arranged in a back-to-back manner. The axes of the explosion-proof wheel 6 and the eccentric wheel 3 are in the same direction. The eccentric wheel 3 and the slider 5 jointly have a locking structure, and the locking structure is used to control the rotation or locking of the explosion-proof wheel 6.

[0030] In this embodiment, referring to Figure 1, the locking structure includes an arc notch 11, a limit notch 12, a pin 4 and a special-shaped groove 13. The arc notch 11 and the limit notch 12 are provided on the outer circumference of the eccentric wheel 3. The arc notch 11 and the limit notch 12 are connected by an arc segment. When the arc segment engages with the clamping notch 10 of the flameproof wheel 6, the flameproof wheel 6 is locked;

[0031] The pin 4 is fixed on the end face of the eccentric wheel 3 facing the slider 5. The special-shaped groove 13 is provided on the end face of the slider 5 facing the eccentric wheel 3. The end of the pin 4 is slidably fitted in the special-shaped groove 13. The special-shaped groove 13 controls the rotation of the eccentric wheel 3 by restricting the movement trajectory of the pin 4.

[0032] In this embodiment, referring to Figure 1 , a partition frame is provided at the middle position of the lower part of the special-shaped groove 13. The lower part of the special-shaped groove 13 forms a first guide groove 14 and a second guide groove 15 on the left and right sides of the partition frame respectively. The middle area of the partition frame is provided in a penetrating manner. A pin 4 is fixedly installed on the eccentric wheel 3. The end of the pin 4 away from the eccentric wheel 3 is slidably arranged in the special-shaped groove 13.

[0033] In this embodiment, a second stepped hole is opened on the partition plate of the fuse base 7. The shaft shoulder of the central rotating shaft of the eccentric wheel 3 passes through the partition frame and is rotatably installed in the second stepped hole, avoiding the eccentric wheel 3 affecting the sliding of the slider 5, so that the eccentric wheel 3 is rotatably installed on the fuse base 7.

[0034] In this embodiment, referring to Figure 1 , a connecting block 18 is installed on the side wall of the upper part of the special-shaped groove 13. The transverse width of the connecting block 18 is half of the width of the special-shaped groove 13; when the projectile is in a state of abnormal acceleration or drop, the slider 5 is in a specific position due to inertia. The connecting block 18 limits and clamps the pin 4 to prevent the eccentric wheel 3 from rotating. The arc segment is stuck in the clamping notch 10 to realize the locking of the flameproof wheel 6, and the fuse should still not be able to release the insurance to ensure the safety of the projectile and the launch platform.

[0035] The working process of this embodiment: referring to Figure 1 , in the initial state, the arc segment is clamped in the clamping notch 10, and the pin 4 is located at the upper end position of the second guide groove 15. At this time, the position where the pin 4 is located is point a. The pin 4 is limited and clamped at point a to realize the locking of the eccentric wheel 3, avoiding the rotation of the eccentric wheel 3. The eccentric wheel 3 locks the flameproof wheel 6, making the flameproof wheel 6 unable to rotate.

[0036] In the normal state of projectile launch, referring to Figure 2, after the projectile leaves the launch platform, the flight acceleration of the projectile increases to a certain value. Under the action of inertia force, the slider 5 gradually moves downward, the first safety spring 2 is compressed. At the same time, under the action of the inertia moment, the eccentric wheel 3 rotates counterclockwise, so that the arc notch 11 rotates to face the clamping notch 10. The end points at both ends of the arc notch 11 along its arc direction and the end points at both ends of the clamping notch 10 along its arc direction are respectively arranged in a separated state. The eccentric wheel 3 unlocks the explosion isolation wheel 6, and the inertial mechanical safety mechanism is released. At this time, the shaft pin 4 moves to the position above the first guide groove 14 along with the movement of the eccentric wheel 3 and the slider 5. At the same time, it is also located below the connecting block 18 and stuck on the side wall of the special-shaped groove 13. The position where the shaft pin 4 is located at this time is point b. The shaft pin 4 moves to point b to lock the eccentric wheel 3 and prevent the eccentric wheel 3 from continuing to rotate;

[0037] Refer to Figure 3 , as the flight acceleration of the projectile gradually decreases, at this time, the elastic force of the first safety spring 2 is gradually greater than the inertia force received by the slider 5. The first safety spring 2 pushes the slider 5 to move upward. At this time, the eccentric wheel 3 is still in the clamped state. The shaft pin 4 moves relatively downward along with the upward movement of the slider 5 and moves to the upper opening of the first guide groove 14. The position where the shaft pin 4 is located at this time is set as point c. The eccentric wheel 3 is still in a non-rotatable state. Even if the flight acceleration of the projectile drops to zero, the inertial mechanical safety mechanism is still in the released state, ensuring the normal launch of the projectile.

[0038] For the abnormal state of projectile launch, refer to Figure 4 , after the projectile leaves the launch platform, in the case of abnormal acceleration or dropping, the inertia force of the slider 5 is greater than the sum of the resistance of the first safety spring 2 and the pressure of the second safety spring 9 on the baffle 8. Under the action of the inertia force, the slider 5 pushes the baffle 8 to move downward, so that both the first safety spring 2 and the second safety spring 9 are compressed. The eccentric wheel 3 rotates counterclockwise. The shaft pin 4 moves to the side wall of the connecting block 18 and is blocked by the connecting block 18. The position where the shaft pin 4 is located at this time is set as point d. When the shaft pin 4 is at point d, the eccentric wheel 3 is locked and cannot continue to rotate. There is still a part of the arc end clamped in the clamping notch 10, and the explosion isolation wheel 6 is still in the locked state and cannot rotate. The inertial mechanical safety mechanism is still in the safety state, ensuring the safety of the projectile and the launch platform and improving the safety performance of the projectile.

[0039] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A mechanical safety mechanism for resisting large overload inertia, characterized in that: The invention comprises a safety base (7) equipped with a recoil safety mechanism, the recoil safety mechanism being used for sensing flight overload; a flameproof wheel (6) being rotatably mounted on the safety base (7), an eccentric wheel (3) being rotatably mounted on the safety base (7), the axes of the flameproof wheel (6) and the eccentric wheel (3) being in the same direction, the eccentric wheel (3) and the slider (5) being jointly provided with a locking structure, the locking structure being used for controlling the rotation or locking of the flameproof wheel (6).

2. A large overload-resistant inertia mechanical safety mechanism as claimed in claim 1, characterized in that: The recoil safety mechanism comprises a guide rod (1), a first safety spring (2), a slider (5), a baffle (8) and a second safety spring (9); the guide rod (1) is mounted on a safety base (7); the slider (5) is slidably arranged on the guide rod (1); the first safety spring (2) is sleeved on the guide rod (1); the upper end of the first safety spring (2) is connected to the lower end of the slider (5); the lower end of the first safety spring (2) is connected to the upper end surface of the baffle (8); the baffle (8) is slidably sleeved on the guide rod (1); the lower end surface of the baffle (8) is connected to the upper end of the second safety spring (9); the lower end of the second safety spring (9) is connected to the bottom of the safety base (7); and the second safety spring (9) is sleeved on the guide rod (1).

3. A large overload inertia mechanical safety mechanism as claimed in claim 2, characterized in that: A limiting groove (16) is provided at the bottom of the safety base (7), the lower end of the guide rod (1) is installed in the limiting groove (16), a limiting plate (17) is provided at the upper opening of the limiting groove (16), and the baffle (8) is limited in the limiting groove (16) by the limiting plate (17).

4. A large overload-resistant inertia mechanical safety mechanism as claimed in claim 2, characterized in that: The elastic force of the second safety spring (9) is greater than the elastic force of the first safety spring (2).

5. The large overload inertia mechanical safety mechanism according to claim 1, characterized in that: The flameproof wheel (6) is provided with a clamping notch (10).

6. A large overload-resistant inertia mechanical safety mechanism as claimed in claim 5, characterized in that: The locking structure comprises an arc notch (11), a limiting notch (12), an axle pin (4) and a special-shaped groove (13); the arc notch (11) and the limiting notch (12) are arranged on the outer circumference of the eccentric wheel (3); the arc notch (11) and the limiting notch (12) are connected by an arc segment; when the arc segment is engaged with the engaging notch (10) of the explosion-proof wheel (6), the explosion-proof wheel (6) is locked; The shaft pin (4) is fixed on the end surface of the eccentric wheel (3) facing the slider (5), the special groove (13) is arranged on the end surface of the slider (5) facing the eccentric wheel (3), the end of the shaft pin (4) is slidably fitted in the special groove (13), and the special groove (13) controls the rotation of the eccentric wheel (3) by limiting the moving trajectory of the shaft pin (4).

7. A large overload-resistant inertia mechanical safety mechanism as claimed in claim 6, characterized in that: A partition frame is provided at the middle position of the lower part of the special-shaped groove (13), and a first guide groove (14) and a second guide groove (15) are formed at the lower part of the special-shaped groove (13) on the left and right sides of the partition frame respectively.

8. A large overload-resistant inertia mechanical safety mechanism as claimed in claim 6, characterized in that: A connecting block (18) is installed on the side wall of the upper part of the special-shaped groove (13), and the lateral width of the connecting block (18) is half of the width of the special-shaped groove (13).

9. A large overload-resistant inertia mechanical safety mechanism as claimed in claim 6, characterized in that: The eccentric wheel (3) is provided with an eccentric notch (19), and the concave arc surface of the eccentric notch (19) and the concave arc surface of the circular arc notch (11) are arranged opposite to each other.

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