An underwater pin pulling device

Abstract

An underwater pin-pulling device includes a housing and a lifting rod and a safety rod connected within the housing. A connecting structure is provided between the lifting rod and the safety rod for synchronous movement. The housing has a groove that cooperates with the connecting structure to lock the safety rod. A pre-compression component is provided on the top of the safety rod for pushing the lifting rod to complete the pin-pulling action. A retaining ring is provided on the top of the housing for limiting the safety rod. A shear pin is provided between the lifting rod and the retaining ring to limit the initial position of the lifting rod. Compared with the prior art, this device eliminates the need for an igniter and gunpowder, completing the pin-pulling action solely through mechanical actuation, thus improving the safety and reliability of the pin-pulling device and avoiding potential hazards caused by external impacts or other stimuli.

Description

Technical Field

[0001] This invention relates to the field of pyrotechnics technology, specifically to an underwater pin-pulling device. Background Technology

[0002] The complex underwater environment poses severe challenges to the mission execution of modern underwater weapons, interfering with processes such as mother-daughter submarine separation, submarine jettisoning, obstacle-clearing munition dispersal, and torpedo launch, thus affecting mission completion timeliness. Currently, commonly used separation and unlocking components include pyrotechnic separation nuts and pin pullers, as well as non-pyrotechnic motor- or hydraulically driven separation devices. Due to the strong electromagnetic environment at the surface and the pressure difference underwater, pyrotechnic separation and unlocking components are prone to premature activation, abnormal reset, and water leakage failure. When using motor- or hydraulically driven separation devices, a power supply or hydraulic system is often required, resulting in a complex structure and large footprint for the separation and unlocking mechanism.

[0003] To address the aforementioned issues, Chinese Patent Application No. 202111358243.9 discloses an underwater pin-pulling device. This device primarily comprises a detonator, a fixing pin, a housing, a piston, a locking cover, a buffer sleeve, and a sealing ring. The detonator and piston are integrated. Before the piston actuates, it is limited by the fixing pin. After reaching the pin-pulling stroke, the piston is locked by a designed locking structure to prevent rebound. Chinese patent application number 202111257066.5 discloses a low-noise pin puller. The disclosed low-noise pin puller includes a plug, a housing, an ignition tube, a shape memory alloy, an adapter, a support ring, a propellant, and a pin. The shape memory alloy contains the ignition tube, support ring, propellant, and pin arranged sequentially from top to bottom. The ignition tube is connected to the threaded hole at the upper end of the shape memory alloy through the adapter. The plug covers the upper part of the shape memory alloy, and the shape memory alloy is in close contact with the lower end face of the plug, so that the plug constrains it. A spring is sleeved on the lower part of the pin. The housing is sleeved on the outside of the shape memory alloy and is threadedly connected to the plug.

[0004] In the aforementioned prior art, the pin removal action requires the cooperation of an ignition tube and a propellant charge. However, this method is prone to danger if the pin removal device is involved in a collision or other external interference, causing the propellant charge to be accidentally ignited. Consequently, the safety and reliability of the pin removal device are relatively low. Summary of the Invention

[0005] The present invention aims to overcome the defects in the prior art and provide an underwater pin-pulling device that is safe and reliable without the need for gunpowder.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: an underwater pin-pulling device, comprising a housing and a lifting rod and a safety rod connected within the housing, wherein a connecting structure is provided between the lifting rod and the safety rod for driving the lifting rod and the safety rod to move synchronously, and a groove is provided within the housing to lock the safety rod in conjunction with the connecting structure; a pre-compression component is provided on the top of the safety rod for pushing the lifting rod to complete the pin-pulling action, a retaining ring is provided on the top of the housing for limiting the safety rod, and a shearing pin is provided between the lifting rod and the retaining ring to limit the initial position of the lifting rod.

[0007] As a preferred embodiment of the present invention, a through groove with an open top is formed inside the housing, the lifting rod and the safety rod are slidably connected in the through groove, and a through hole connected to the through groove is formed at the bottom of the housing, with the bottom of the safety rod passing through the through hole.

[0008] As a preferred embodiment of the present invention, the connecting structure is a steel ball, a connecting groove adapted to the steel ball is formed on the outer wall of the bottom of the lifting rod, and a steel ball hole adapted to the steel ball is formed on the top of the safety rod.

[0009] In a preferred embodiment of the present invention, the groove is located at the top of the housing and is formed on the inner wall of the housing. The groove is connected to the through groove, and the steel ball is located in the groove after the safety rod is pulled out.

[0010] As a preferred embodiment of the present invention, the top of the safety bar is formed with a mounting groove, the bottom end of the lifting rod and the pre-compression component are disposed in the mounting groove, and the steel ball hole is connected to the mounting groove.

[0011] As a preferred embodiment of the present invention, the pre-compression assembly includes a piston and a piston hole formed in the middle of the piston. A screw connected to a lifting rod is provided in the piston hole, and a spring is sleeved on the screw, with the spring passing through the piston hole.

[0012] As a preferred embodiment of the present invention, the bottom of the lifting rod is formed with a first screw hole for connecting screws, and the bottom of the mounting groove of the safety bar is formed with a second screw hole corresponding to the screw. The screw is clearance-fitted with the first screw hole and interference-fitted with the second screw hole.

[0013] As a preferred embodiment of the present invention, a sealing groove is formed on the outer wall of the bumper along the circumferential direction of the bumper, and a sealing ring is provided in the sealing groove to abut against the groove wall.

[0014] In a preferred embodiment of the present invention, the lifting rod is sleeved in the retaining ring, the retaining ring is located at the end of the through groove, and the retaining ring is threaded to the groove wall of the through groove. A first connecting hole is formed on the retaining ring in a radial configuration for connecting the shear pin.

[0015] As a preferred embodiment of the present invention, the top end of the lifting rod is provided with a radially arranged second connecting hole and a third connecting hole, and the top end of the lifting rod is also provided with a connecting ring, a shear pin is provided in the second connecting hole, and a bolt for fixing the connecting ring is provided in the third connecting hole.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By cutting the shear pin, the lifting rod rebounds upward under the action of the pre-compression component, and simultaneously drives the safety bar to move under the action of the connecting structure, so that the lower end of the safety bar is pulled out from the hole of the explosion-proof component of the safety mechanism, thus completing the pin pulling action. No igniter or gunpowder is required. The pin pulling action is completed by pure mechanical action, which improves the safety and reliability of the pin pulling device and avoids potential hazards caused by external impacts and other stimuli.

[0018] 2. Furthermore, after the pin is removed, the steel ball moves into the groove. At this time, the steel ball is simultaneously located in the groove and the steel ball hole, and the piston abuts against the steel ball hole to seal the steel ball hole, so that the steel ball cannot be removed from the groove and the steel ball hole, thereby locking the safety bar after the pin is removed and preventing the safety bar from resetting.

[0019] 3. Furthermore, the piston movement distance after the pin is pulled out is limited by the retaining ring set at the top of the housing, thereby preventing the piston from sliding out of the through groove. At the same time, the retaining ring and the sealing ring work together to seal the pin pulling device, thus ensuring that the pin pulling action performed underwater is in a sealed state throughout. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the pre-compression component of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the bumper of the present invention;

[0023] Figure 4 This is a structural diagram of the lifting rod;

[0024] Figure 5 This is a structural diagram illustrating the release of the insurance status.

[0025] Reference numerals: housing 1, through groove 101, recess 1011, through hole 102, lifting rod 2, first screw hole 201, connecting groove 202, second connecting hole 203, third connecting hole 204, safety rod 3, mounting groove 301, second screw hole 3011, steel ball hole 302, sealing groove 303, sealing ring 3031, preload assembly 4, piston 401, piston hole 4011, screw 402, spring 4021, shear pin 5, connecting ring 6, bolt 601, retaining ring 7, first connecting hole 701, steel ball 8. Detailed Implementation

[0026] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] like Figures 1-4 As shown, an underwater pin-pulling device includes a housing 1 and a lifting rod 2 and a safety rod 3 connected within the housing 1. A connecting structure is provided between the lifting rod 2 and the safety rod 3 to drive the lifting rod 2 and the safety rod 3 to move synchronously. The housing 1 has a groove 1011 that cooperates with the connecting structure to lock the safety rod 3. A pre-compression component 4 is provided on the top of the safety rod 3 to push the lifting rod 2 to complete the pin-pulling action. A retaining ring 7 is provided on the top of the housing 1 to limit the safety rod 3. A shearing pin 5 is provided between the lifting rod 2 and the retaining ring 7 to limit the initial position of the lifting rod 2.

[0028] Furthermore, the housing 1, the lifting rod 2, and the safety rod 3 are all cylindrical structures. The lifting rod 2 and the safety rod 3 are both arranged along the length of the housing 1. In the initial state, the end of the safety rod 3 is inserted into the explosion-proof component of the safety mechanism. The connecting structure is set at the connection between the lifting rod 2 and the safety rod 3. The connecting structure enables the safety rod 3 to move synchronously when the lifting rod 2 moves, thereby realizing the pin-pulling action.

[0029] The pre-compression component 4 is located at the top of the safety rod 3 and between the safety rod 3 and the lifting rod 2. The shear pin 5 is located at the top of the lifting rod 2 and is located on the outside of the housing 1. The shear pin 5 is located inside the retaining ring 7 to limit the lifting rod 2. When the shear pin 5 breaks, the pre-compression component 4 pushes the lifting rod 2 to move outward along the axial direction of the housing 1. Under the action of the connecting structure, the lifting rod 2 drives the safety rod 3 to move, thereby causing the end of the safety rod 3 to be pulled out from the explosion-proof component of the safety mechanism, that is, the pin pulling action is realized.

[0030] In addition, the groove 1011 is located near the top of the housing 1. After the pin pulling action is completed, the connecting structure moves into the groove 1011, thereby limiting the position of the safety rod 3 and preventing the safety rod 3 from resetting.

[0031] The housing 1 has a through groove 101 with an open top. The lifting rod 2 and the safety rod 3 are slidably connected in the through groove 101. The bottom of the housing 1 has a through hole 102 that communicates with the through groove 101. The bottom of the safety rod 3 passes through the through hole 102. Furthermore, the through groove 101 is arranged along the axial direction of the housing 1. The lifting rod 2 and the safety rod 3 are arranged sequentially from the top opening of the housing 1 inward. The through hole 102 is arranged along the axial direction of the housing 1, and the inner diameter of the through hole 102 is smaller than the inner diameter of the through groove 101. The bottom of the safety rod 3 passes through the through hole 102 and is connected to the explosion-proof component of the safety mechanism.

[0032] The connecting structure is a steel ball 8. A connecting groove 202 adapted to the steel ball 8 is formed on the bottom outer wall of the lifting rod 2. A steel ball hole 302 adapted to the steel ball 8 is formed on the top of the safety rod 3. Furthermore, the connecting groove 202 is set along the circumferential direction of the lifting rod 2, and the steel ball hole 302 is set on opposite sides of the safety rod 3. The connecting groove 202 and the steel ball hole 302 are located at the same height. The steel ball 8 is located in both the connecting groove 202 and the steel ball hole 302. The lifting rod 2 and the safety rod 3 are connected together by the steel ball 8, so that the safety rod 3 and the lifting rod 2 can move synchronously. The steel ball 8 is restricted in the axial direction by the steel ball hole 302 on the safety rod 3, and in the radial direction by the groove wall of the through groove 101 of the housing 1 and the connecting groove 202 of the lifting rod 2, so that the steel ball 8 is in a relatively fixed position. The steel ball 8 controls the axial displacement of the safety rod 3. The lower end of the safety rod 3 is inserted into the corresponding hole of the explosion-proof component of the safety mechanism, so that the safety mechanism is in a safe state.

[0033] The groove 1011 is located at the top of the housing 1 and is formed on the inner wall of the housing 1. The groove 1011 is connected to the through groove 101. After the safety rod 3 completes the pin removal, the steel ball 8 is located in the groove 1011. Furthermore, the groove 1011 is set along the circumferential direction of the housing 1. When the pre-pressing component 4 pushes the lifting rod 2 to move, the safety rod 3 is moved under the action of the steel ball 8, thereby realizing the pin removal action. At this time, the steel ball 8 moves along the axial direction of the housing 1. When the steel ball 8 moves to the groove 1011, the groove surface of the connecting groove 202 of the lifting rod 2 will push the steel ball 8 to move into the groove 1011. At this time, the lifting rod 2 and the safety rod 3 are separated.

[0034] The top of the bumper 3 has a mounting groove 301. The bottom end of the lifting rod 2 and the preload assembly 4 are disposed in the mounting groove 301, and the ball bearing hole 302 is connected to the mounting groove 301. Furthermore, the mounting groove 301 is arranged along the axial direction of the bumper 3. The ball bearing hole 302 is connected to the opposite sides of the mounting groove 301. The end of the lifting rod 2 is inserted into the mounting groove 301. The preload assembly 4 is disposed in the mounting groove 301 and is located between the lifting rod 2 and the bumper 3.

[0035] The pre-compression assembly 4 includes a piston 401 and a piston hole 4011 formed in the middle of the piston 401. A screw 402 connected to the lifting rod 2 is provided in the piston hole 4011, and a spring 4021 is sleeved on the screw 402. The spring 4021 passes through the piston hole 4011. Furthermore, the piston 401 is located in the mounting groove 301 at the top of the safety rod 3. The screw 402 passes through the piston hole 4011 and is connected to the piston 401. The two ends of the screw 402 are connected to the lifting rod 2 and the safety rod 3, respectively. In addition, the spring 4021 is sleeved on the screw, and the two ends of the spring 4021 abut against the lifting rod 2 and the safety rod 3, respectively. When the bottom end of the safety rod 3 is connected to the explosion-proof component of the safety mechanism and is in a safe state, the spring 4021 is in a compressed state.

[0036] During the pin removal process, the piston 401 and the safety rod 3 are moved by the action of the spring 4021. At the same time, the spring 4021 pushes the piston 401 to the end of the mounting groove 301. The end face of the piston 401 is flush with the end face of the safety rod 3. At this time, the piston 401 moves and abuts against the lower end face of the retaining ring 7. The steel ball 8 moves into the groove 1011. The outer wall of the piston 401 abuts against the steel ball hole 302 of the safety rod 3, thereby sealing the steel ball hole 302 and preventing the steel ball 8 from coming out of the steel ball hole 302. Under the action of the groove 1011, the steel ball hole 302 and the piston 401, the steel ball 8 is limited, thereby limiting the safety rod 3 and preventing the safety rod 3 from resetting.

[0037] The bottom of the lifting rod 2 has a first screw hole 201 for connecting the screw 402. The bottom of the mounting groove 301 of the safety rod 3 has a second screw hole 3011 corresponding to the screw 402. The screw 402 is clearance-fitted with the first screw hole 201 and interference-fitted with the second screw hole 3011. Furthermore, the first screw hole 201 is located on the bottom end face of the lifting rod 2 and is located in the middle of the lifting rod 2. The screw 402 is inserted into the first screw hole 201, and the clearance-fit between the screw 402 and the first screw hole 201 ensures that the lifting rod 2 can be separated from the screw 402 when the pin is pulled out.

[0038] Furthermore, the second screw hole 3011 is provided on the bottom surface of the mounting groove 301 along the axial direction of the safety rod 3. The second screw hole 3011 is coaxially arranged with the first screw hole 201. The bottom end of the screw 402 is inserted into the second screw hole 3011. Through the interference fit between the screw 402 and the second screw hole 3011, it is ensured that the screw 402 will not come out of the second screw hole 3011 during the pin pulling process.

[0039] A sealing groove 303 is formed on the outer wall of the safety rod 3 along the circumferential direction of the safety rod 3. A sealing ring 3031 is provided in the sealing groove 303 to abut against the groove wall of the through groove 101. Furthermore, the sealing ring 3031 is provided to achieve the sealing effect on the pin pulling device, ensuring that the reimbursement mechanism can be used normally underwater.

[0040] The lifting rod 2 is sleeved in the retaining ring 7, which is located at the end of the through groove 101 and is threaded to the groove wall of the through groove 101. The retaining ring 7 has a first connecting hole 701 formed on it, which is radially arranged and used to connect the shear pin 5. Furthermore, the retaining ring 7 is located at the top of the housing 1. During the pin pulling process, the piston 401 moves to the retaining ring 7, and the retaining ring 7 restricts the end position of the piston 401's movement.

[0041] In addition, the bumper 3, piston 401, screw 402, lifting rod 2, retaining ring 7 are coaxially arranged with the housing 1.

[0042] The top end of the lifting rod 2 has a radially arranged second connecting hole 203 and a third connecting hole 204, and the top end of the lifting rod 2 is also provided with a connecting ring 6. The shear pin 5 is provided in the second connecting hole 203, and the third connecting hole 204 is provided with a bolt 601 for fixing the connecting ring 6.

[0043] The specific working process of this invention is as follows: When the shearing pin 5 is sheared by a specific external force, the spring 4021 is in a compressed state. Under the action of the elastic force of the spring 4021, the spring 4021 pushes the lifting rod 2 to move. Under the restriction of the steel ball 8, the lifting rod 2 drives the safety rod 3 to move axially. The lower end of the safety rod 3 is pulled out from the hole of the explosion-proof part of the safety mechanism, and the mechanical safety is opened. Under the push of the spring 4021, when the upper end of the safety rod 3 abuts against the lower end face of the retaining ring 7, the steel ball 8 is in the groove 1011 of the housing 1. The lifting rod 2 continues to move, and the inclined surface of the connecting groove 202 of the lifting rod 2 pushes the steel ball 8 into the groove 1011. The connecting ring 6, the bolt 601 and the lifting rod 2 are disengaged from the through groove 101 of the housing 1. The piston 401 moves axially under the push of the spring 4021, and the screw 402 controls the movement distance of the piston 401.

[0044] like Figure 5 As shown, under the push of the spring 4021, when the piston 401 abuts against the lower end face of the retaining ring 7, the piston 401 forces half of the steel ball 8 into the groove 1011 of the housing 1 and the other half into the steel ball hole 302 of the safety rod 3. The groove 1011, the steel ball 8, the spring 4021, the piston 401, and the retaining ring 7 form a locking structure. Under the restriction of the locking structure, the safety rod 3 cannot move down, which can prevent the safety rod 3 from being re-inserted into the corresponding hole of the explosion-proof component of the safety mechanism after reset, ensuring that the safety rod 3 is always in the safety-disarmed state.

[0045] The aforementioned sealing ring 3031 engages with the groove wall of the through groove 101 of the housing 1. During the movement of the safety rod 3, the sealing ring 3031 ensures that the pin-pulling device remains sealed underwater.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention; therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0047] Although this document frequently uses reference numerals from the figures, such as housing 1, through groove 101, recess 1011, through hole 102, lifting rod 2, first screw hole 201, connecting groove 202, second connecting hole 203, third connecting hole 204, safety rod 3, mounting groove 301, second screw hole 3011, steel ball hole 302, sealing groove 303, sealing ring 3031, preload assembly 4, piston 401, piston hole 4011, screw 402, spring 4021, shear pin 5, connecting ring 6, bolt 601, retaining ring 7, first connecting hole 701, and steel ball 8, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. An underwater pin pulling device, characterized by, The device includes a housing (1) and a lifting rod (2) and a safety rod (3) connected within the housing (1). A connecting structure is provided between the lifting rod (2) and the safety rod (3) to drive the lifting rod (2) and the safety rod (3) to move synchronously. A groove (1011) is provided inside the housing (1) to lock the safety rod (3) in conjunction with the connecting structure. A pre-compression component (4) is provided on the top of the safety rod (3) to push the lifting rod (2) to complete the pin-pulling action. A retaining ring (7) is provided on the top of the housing (1) to limit the safety rod (3). A limiting lifting rod (2) is provided between the lifting rod (2) and the retaining ring (7). The initial position shear pin (5); the connecting structure is a steel ball (8), a connecting groove (202) adapted to the steel ball (8) is formed on the bottom outer wall of the lifting rod (2), and a steel ball hole (302) adapted to the steel ball (8) is formed on the top of the safety rod (3); the pre-pressing component (4) includes a piston (401) and a piston hole (4011) formed in the middle of the piston (401). A screw (402) connected to the lifting rod (2) is provided in the piston hole (4011), and a spring (4021) is sleeved on the screw (402). The spring (4021) passes through the piston hole (4011).

2. An underwater pin pulling device according to claim 1, wherein The housing (1) has a through groove (101) with an open top. The lifting rod (2) and the safety rod (3) are slidably connected in the through groove (101). The bottom of the housing (1) has a through hole (102) that communicates with the through groove (101). The bottom of the safety rod (3) passes through the through hole (102).

3. An underwater pin pulling device according to claim 2, wherein, The groove (1011) is located at the top of the housing (1) and is formed on the inner wall of the housing (1). The groove (1011) is connected to the through groove (101). After the safety rod (3) completes the pin removal, the steel ball (8) is located in the groove (1011).

4. The underwater pin puller of claim 1, wherein, The top of the safety bar (3) has a mounting groove (301), the bottom of the lifting rod (2) and the pre-pressurization component (4) are disposed in the mounting groove (301), and the steel ball hole (302) is connected to the mounting groove (301).

5. The underwater pin puller of claim 1, wherein, The bottom of the lifting rod (2) has a first screw hole (201) for connecting the screw (402), and the bottom of the mounting groove (301) of the safety bar (3) has a second screw hole (3011) corresponding to the screw (402). The screw (402) is clearance-fitted with the first screw hole (201), and the screw (402) is interference-fitted with the second screw hole (3011).

6. The underwater pin puller of claim 2, wherein, A sealing groove (303) is formed on the outer wall of the bumper (3) along the circumferential direction of the bumper (3), and a sealing ring (3031) is provided in the sealing groove (303) to abut against the groove wall of the through groove (101).

7. The underwater pin puller of claim 2, wherein, The lifting rod (2) is sleeved in the retaining ring (7), which is located at the end of the through groove (101) and is threaded to the groove wall of the through groove (101). A first connecting hole (701) is formed on the retaining ring (7) in a radial configuration for connecting the shear pin (5).

8. The underwater pin puller of claim 1, wherein, The top end of the lifting rod (2) is formed with a radially arranged second connecting hole (203) and a third connecting hole (204), and the top end of the lifting rod (2) is also provided with a connecting ring (6). A shear pin (5) is provided in the second connecting hole (203), and a bolt (601) for fixing the connecting ring (6) is provided in the third connecting hole (204).

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