Pin puller with long-acting locking function

Abstract

The pin puller with the long-acting locking function comprises a shell, a plug screw is fixedly installed in a shell opening in one axial end of the shell in a plugging mode, the other axial end of the shell is a closed end, a piston body is arranged in the shell, an ignition piece is installed in the piston body, and one axial end of the piston body is provided with a vent hole and a reducing extension part. The extension part penetrates out of the closed end of the shell, the shear pin penetrating through the shell also penetrates through the extension part, a concave hole is formed in the face, facing the piston body, of the plug screw to form a concave hole face, and the hardness of the piston body material is larger than that of the plug screw material. After the pin is pulled out, even if the pressure of the space between the piston body and the closed end of the shell is gradually attenuated to normal pressure, the piston body can be locked, and then it can be ensured that the pin-pulled part can be locked after the pin is pulled out.

Description

Technical Field

[0001] This utility model relates to the field of pin pullers, specifically a pin puller with a long-term locking function. Background Technology

[0002] The detonator in the weapon unit includes a housing. One axial end of the housing is a housing opening, in which a plug is fixedly installed. The other axial end of the housing is a closed end. A piston body is coaxially installed inside the housing. An ignition element is installed inside the piston body. The axial end of the piston body facing the closed end of the housing has a reduced-diameter extension. The axial end of the piston body with the extension has a vent hole connecting the inner cavity of the piston body and the space between the piston body and the closed end of the housing. The extension extends out from the closed end of the housing as a piston rod. A shear pin is also installed radially through the housing. The shear pin also extends radially through the extension, thereby fixing and locking the extension.

[0003] During operation, the protruding end of the extension connects to the pin to be pulled from the weapon unit. A shear pin penetrates the extension, initially locking the pin. When pin removal is required, the ignition element detonates, generating high-temperature, high-pressure gas that enters the space between the piston body and the sealed end of the casing through the piston body's vent. This creates high pressure in the space, causing the piston body to move towards the plugging screw on the casing. At this point, the extension is forced to disconnect the shear pin, moving with the piston body, thus achieving the pin removal function.

[0004] In existing pin-pulling devices, after the ignition element explodes, the high-temperature, high-pressure gas in the space between the piston body and the sealed end of the housing creates a short-term locking effect after the pin is pulled. However, as the temperature of the gas in this space decreases and gas slowly leaks out, the pressure gradually decreases to atmospheric pressure, causing the piston body to gradually regain its mobility. Some weapon units require the pulled pin to remain locked for a period of time after being pulled. If the piston body quickly regains its mobility after the pin is pulled, it will undoubtedly lead to malfunctions in the pulled pin section, which requires a period of locking after being pulled. Utility Model Content

[0005] This invention provides a pin puller with a long-term locking function to solve the problem that the piston body of the existing pin puller will resume its movement function shortly after the pin is pulled.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A pin puller with a long-lasting locking function includes a housing. One axial end of the housing is a housing opening, in which a plug is fixedly installed. The other axial end of the housing is a closed end. A piston body is coaxially installed inside the housing. An ignition element is installed inside the piston body. One axial end of the piston body has a reduced-diameter extension, and the axial end of the piston body with the extension has a vent hole connecting the inner cavity of the piston body and the outside of the piston body. The extension serves as a piston rod, extending out from the closed end of the housing. A shear pin is also radially installed through the housing, and the shear pin also radially penetrates the extension. The side of the plug facing the piston body has a concave hole forming a concave hole surface, and the hardness of the piston body material is greater than the hardness of the plug material.

[0008] Furthermore, both the piston body and the plug are made of 05Cr17Ni4Cu4Nb material, and the hardness of the 05Cr17Ni4Cu4Nb material used to make the plug is less than that of the 05Cr17Ni4Cu4Nb material used to make the piston body after treatment.

[0009] In this invention, the side of the plug facing the piston body is designed as a concave surface, and the hardness of the plug material is less than that of the piston body material. When the pin is pulled out, the piston body moves to the concave surface of the plug under pressure and impacts the plug, causing the concave surface of the plug to deform. After deformation, the concave surface of the plug locks the piston body, thereby fixing and locking the piston body after the pin is pulled out. This ensures that even if the pressure in the space between the piston body and the closed end of the housing gradually decreases to normal pressure after the pin is pulled out, the pin puller can still lock the piston body, thus ensuring that the part whose pin is pulled out can be locked after the pin is pulled out.

[0010] In this invention, both the piston body and the plug are made of 05Cr17Ni4Cu4Nb material, and the hardness of the 05Cr17Ni4Cu4Nb material in the plug, after treatment, is lower than that of the 05Cr17Ni4Cu4Nb material used to make the piston body. The piston body and plug made of 05Cr17Ni4Cu4Nb material have advantages such as corrosion resistance and high strength, and are also easy to process, thus allowing for the manufacture of piston bodies and plugs with different hardnesses, which is convenient to manufacture. Attached Figure Description

[0011] Figure 1 This is a structural diagram of an embodiment of the present utility model. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] like Figure 1As shown, this embodiment discloses a pin puller with a long-term locking function, including a housing 1. The axial direction of the housing 1 is vertical. The upper axial end of the housing 1 is a housing opening, and a plugging screw 2 is fixedly installed in the housing opening. The lower axial end of the housing 1 is a closed end.

[0014] A piston body 3 is coaxially mounted inside the housing 1. The outer diameter of the piston body 3 matches the inner diameter of the housing 1, and a sealing ring is provided on the circumferential outer side of the piston body 3 to form a seal with the inner wall of the housing 1. An axially vertical mounting hole is provided from the axial upper end of the piston body 3 into the piston body 3. The mounting hole serves as the interior of the piston body for mounting an ignition element 4. The propellant portion of the ignition element 4 faces downward toward the axial lower end of the piston body 3. The wire 5 of the ignition element 4 is a flexible wire. After passing through the orifice of the mounting hole located at the axial upper end of the piston body 3, the wire 5 of the ignition element 4 passes through an opening on one side wall of the housing 1. The orifice at the axial upper end of the piston body 3 and the opening in the housing 1 through which the wire 5 passes are respectively sealed with glue.

[0015] A vent hole 8 is provided on the left side of the lower axial end of the piston body 3. One end of the vent hole 8 communicates with the mounting hole of the piston body 3, and the other end of the vent hole 8 communicates with the space between the lower axial end of the piston body 3 and the closed end of the housing 1. An extension 6 extends downward from the right side of the lower axial end of the piston body 3. The extension 6 serves as the piston rod. The outer diameter of the extension 6 is smaller than the outer diameter of the lower axial end of the piston body 3. The extension 6 extends downward to pass through the closed end of the lower axial end of the housing 1, and a sealing ring is provided on the circumferential outer side of the extension 6 to form a seal with the closed end of the housing 1.

[0016] A shear pin 7 is installed radially through the closed end of the housing 1. The shear pin 7 also radially penetrates the extension 6. The shear pin 7 serves to initially lock the extension 6, thereby initially locking the piston body 3.

[0017] The plug screw 2 has a concave hole on the axial lower end face of the piston body to form a concave hole surface 9. The concave hole is a trapezoidal hole or a conical hole, and the diameter of the concave hole gradually increases from top to bottom.

[0018] The piston body 3 is made of a material with a higher hardness than the plug screw 2. In this embodiment, both the piston body 3 and the plug screw 2 are made of 05Cr17Ni4Cu4Nb material.

[0019] Specifically, after aging the 05Cr17Ni4Cu4Nb material at 460℃~480℃, the hardness of the 05Cr17Ni4Cu4Nb material reaches 40HRC, and the piston body 3 is made from the 05Cr17Ni4Cu4Nb material with a hardness of 40HRC. After aging the 05Cr17Ni4Cu4Nb material at 620℃, the hardness of the 05Cr17Ni4Cu4Nb material reaches 28HRC, and the plug screw 2 is made from the 05Cr17Ni4Cu4Nb material with a hardness of 28HRC. Thus, a plug screw 2 with a hardness lower than that of the piston body 3 is obtained.

[0020] Before the pin is pulled out, the protruding end of the extension 6 is connected to the pin-pulled part of the weapon unit. Since the extension 6 and the piston body 3 are locked together by the shear pin 7, the pin-pulled part is locked at the beginning.

[0021] When the pin is pulled out, electricity is supplied to the ignition element 4 through the wire 5, causing the propellant section inside the ignition element 4 to explode. The high-temperature and high-pressure gas generated by the explosion enters the space between the lower axial end of the piston body 3 and the closed end of the housing 1 through the vent hole 8 at the lower axial end of the piston body 3, thereby creating high pressure in the space between the lower axial end of the piston body 3 and the closed end of the housing 1. Under the action of high pressure, the piston body 3 moves upward toward the plug 2. At this time, the extension 6 is subjected to force and breaks the shear pin 7, moving upward with the piston body 3, thereby completing the function of pulling out the pin.

[0022] When the piston body 3 moves upward under the action of high-pressure gas and enters and impacts the concave surface of the plug 2 at its upper axial end, the hardness of the piston body 3 is greater than that of the plug 2, causing the concave surface 9 of the plug 2 to deform. The deformed concave surface 9 of the plug 2 then jams the piston body 3, thereby locking the piston body 3 after the pin is pulled out. Furthermore, the extension 6 also locks the pulled-out part in the initial stage after the pin is pulled out. At this time, the high-pressure gas in the space between the lower axial end of the piston body 3 and the closed end of the housing 1 after the pin is pulled out can also lock the piston body 3 in the initial stage after the pin is pulled out. Therefore, in this embodiment, the initial stage after the pin is pulled out is achieved by the combination of high-pressure gas and the deformed concave surface 9 of the plug 2 to lock the piston body 3.

[0023] In the subsequent stage after the pin is pulled out, the temperature of the gas in the space between the piston body and the closed end of the housing decreases and the gas leaks slowly. The pressure in the space between the piston body and the closed end of the housing gradually decreases to normal pressure. At this time, the deformed plug 2 alone plays a locking role on the piston body 3. Then, through the extension 6, it plays a locking role on the part of the pin that was pulled out in the subsequent stage after the pin is pulled out, so as to meet the locking requirements of the part of the pin that was pulled out after the weapon unit pulled out the pin.

[0024] The preferred embodiments of this utility model have been described in detail above with reference to the accompanying drawings. These embodiments are merely descriptions of preferred embodiments and are not intended to limit the concept and scope of this utility model. The various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. Such combinations, as long as they do not violate the spirit of this utility model, should also be considered as part of this disclosure. To avoid unnecessary repetition, this utility model will not further describe all possible combinations.

[0025] This utility model is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this utility model and without departing from the design idea of ​​this utility model, all modifications and improvements made by those skilled in the art to the technical solution of this utility model should fall within the protection scope of this utility model. The technical content for which protection is sought in this utility model has been fully recorded in the claims.

Claims

1. A pin puller with a long-term locking function, comprising a housing, one axial end of the housing being a housing opening, a plugging screw being fixedly installed in the housing opening, the other axial end of the housing being a closed end, a piston body being coaxially mounted inside the housing, an ignition element being installed inside the piston body, one axial end of the piston body having a reduced-diameter extension, and the axial end of the piston body with the extension having a vent hole communicating with the inner cavity of the piston body and the outside of the piston body, the extension serving as a piston rod extending out from the closed end of the housing, and a shear pin being radially installed through the housing, the shear pin also radially penetrating through the extension, characterized in that... The plug has a concave hole on the side facing the piston body to form a concave hole surface, and the hardness of the piston body material is greater than that of the plug material.

2. A pin puller with a long-term locking function according to claim 1, characterized in that, The piston body and the plug are both made of 05Cr17Ni4Cu4Nb material, and the hardness of the 05Cr17Ni4Cu4Nb material used to make the plug is less than that of the 05Cr17Ni4Cu4Nb material used to make the piston body after treatment.

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