Pin puller and vehicle

Abstract

The application discloses a pin puller and a vehicle, and relates to the technical field of vehicle manufacturing. The pin puller comprises a shell, a medicine box and an inner shell, wherein the medicine box and the inner shell are both installed in the shell, the medicine box is in communication with the inner shell, and a piston is arranged in the shell. One end of the piston is located in the inner shell, and the other end of the piston extends out of the shell. The medicine box and the inner shell are distributed along the movement direction of the piston, the gas generated after the fuel in the medicine box is ignited is suitable to enter the inner shell, and the piston is pushed to move in the inner shell towards the direction close to the medicine box. According to the pin puller, the impact response and noise are small, the surrounding components and structures are not damaged, the structure is small and regular, the pin puller is convenient to manufacture, and the pin puller occupies a small space.

Description

Technical Field

[0001] This invention relates to the field of vehicle manufacturing technology, and more particularly to a pin puller and a vehicle having the pin puller. Background Technology

[0002] A pyrotechnic pin puller is a device that uses the energy generated by pyrotechnics (such as gunpowder or explosives) to quickly pull out or release pins from their connections.

[0003] In related technologies, the piston typically impacts the outer cylinder directly, subjecting the pyrotechnic pin puller to severe impact stress. This can damage surrounding electronic components such as wiring harnesses, pose a risk of damaging the outer cylinder, and generate excessive noise and vibration. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pin puller with very low impact response and noise, which will not damage surrounding components and structures. The pin puller has a small and regular structure, is easy to manufacture, and occupies little space.

[0005] According to an embodiment of the present invention, a pin puller includes: a housing; a medicine box and an inner shell, both of which are installed inside the housing and communicate with the inner shell; a piston, one end of which is located inside the inner shell and the other end extends outside the housing; wherein the medicine box and the inner shell are distributed along the movement direction of the piston, and the gas generated after the fuel in the medicine box is ignited is suitable to enter the inner shell and push the piston to move in the inner shell toward the medicine box.

[0006] According to an embodiment of the present invention, the pin puller allows the piston to move within the inner shell by placing one end of the piston inside the inner shell and extending the other end outside the outer shell. By distributing the medicine box and the inner shell along the direction of piston movement, the gas generated after the fuel in the medicine box is ignited can enter the inner shell and act on the piston, pushing the piston to move towards the medicine box within the inner shell. Thus, the impact force can be transmitted from the inner shell to the medicine box. The deformation of the inner shell and the medicine box absorbs most of the impact stress and the impact energy of the fuel combustion itself, thereby greatly reducing the overall impact response and noise of the pin puller. That is, the impact response and noise generated to the surroundings are very small, avoiding damage to surrounding components and structures. The overall structure of the pin puller is small and regular, easy to manufacture, and occupies little space.

[0007] According to some embodiments of the present invention, the inner shell has a collapsible socket that opens toward the piston. One end of the piston is provided with a first collapsible protrusion. The first collapsible protrusion is adapted to insert into the collapsible socket when the piston moves toward the medicine box and abuts against the inner peripheral wall of the collapsible socket.

[0008] According to some embodiments of the present invention, the outer diameter of the first collapsible boss is configured to gradually decrease along the direction close to the collapsible socket; And / or, the inner diameter of the collapsible socket is configured to gradually decrease in the direction away from the piston.

[0009] According to some embodiments of the present invention, the inner shell has a second collapsible protrusion protruding axially at one end away from the piston, the collapsible insertion port is formed on the side of the second collapsible protrusion facing the inner shell, and the second collapsible protrusion abuts against the medicine box.

[0010] According to some embodiments of the present invention, the medicine box has a collapsible groove formed at one end facing the inner shell, a second collapsible protrusion is distributed opposite to the collapsible groove, and at least a portion of the second collapsible protrusion extends into the collapsible groove; wherein the medicine box is provided with a plurality of vent holes distributed around the collapsible groove, and the gas in the medicine box is adapted to flow from the vent holes to the inner shell.

[0011] According to some embodiments of the present invention, the inner peripheral wall of the outer shell is spaced apart from the outer peripheral wall of the inner shell to define an airflow channel, one end of the airflow channel is connected to the medicine box, and the other end of the airflow channel is connected to the end of the inner shell away from the medicine box.

[0012] According to some embodiments of the present invention, the pin puller further includes an air guide ring, which is sleeved on the outside of the piston and located between the end of the inner shell away from the medicine box and the inner end face of the outer shell. The air guide ring is provided with an air guide groove, and the airflow channel is connected to the end of the inner shell away from the medicine box through the air guide groove.

[0013] According to some embodiments of the present invention, the pin puller further includes a shearing pin, which is inserted into the gas guide ring and the piston, and the insertion direction of the shearing pin intersects with the movement direction of the piston.

[0014] According to some embodiments of the present invention, a first sealing element is provided between the piston and the inner peripheral wall of the inner shell; and / or, a second sealing element is provided between the piston and the inner peripheral wall of the outer shell; and / or, the outer shell is further provided with an ignition structure located at one end of the medicine box away from the inner shell; and / or, a cushioning cotton is provided at the inner end of the medicine box away from the inner shell.

[0015] The present invention also proposes a vehicle.

[0016] The vehicle according to embodiments of the present invention includes the pin puller described in any of the above embodiments.

[0017] The vehicle and the aforementioned pin puller have the same advantages over the prior art, which will not be repeated here.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is an exploded view of the pin puller according to an embodiment of the present invention; Figure 2 This is a screenshot of the pin puller according to an embodiment of the present invention; Figure 3 This is a second screenshot of the pin puller according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the air guide ring and shear pin according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the ignition structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the air guide ring according to an embodiment of the present invention. Figure 1 ; Figure 7 This is a cross-section of the air guide ring according to an embodiment of the present invention. Figure 1 ; Figure 8 This is a schematic diagram of the structure of the air guide ring according to an embodiment of the present invention. Figure 2 ; Figure 9 This is a cross-section of the air guide ring according to an embodiment of the present invention. Figure 2 ; Figure 10 This is a schematic diagram of the structure of a medicine box according to an embodiment of the present invention. Figure 1 ; Figure 11 This is a schematic diagram of the structure of a medicine box according to an embodiment of the present invention. Figure 2 ; Figure 12 yes Figure 11 Cross-sectional view at point AA; Figure 13 This is a schematic diagram of the structure of the mounting base according to an embodiment of the present invention; Figure 14 This is a cross-sectional view of the mounting base according to an embodiment of the present invention; Figure 15 This is a cross-sectional view of the outer casing according to an embodiment of the present invention; Figure 16 This is a cross-sectional view of the inner shell according to an embodiment of the present invention; Figure 17 This is a cross-sectional view of the piston according to an embodiment of the present invention; Figure 18 This is a cross-sectional view of the piston, inner shell, and guide ring according to an embodiment of the present invention; Figure 19 This is an assembly diagram of the gas guide ring and piston according to an embodiment of the present invention; Figure 20 This is an assembly diagram of the gas guide ring, piston, and inner shell according to an embodiment of the present invention.

[0020] Figure label: Pin puller 100, Outer shell 1, through hole 11, second sealing groove 12, mounting port 13, Medicine box 2, shrinkage trough 21, vent 22, Inner shell 3, crumple socket 31, second crumple boss 33, Piston 4, first collapsible boss 41, first sealing groove 42, vent hole 43, piston head 44, piston rod 45, second pin hole 46. Airflow channel 51, air guide ring 6, air guide groove 61, mounting groove 62, first pin hole 63. Shear pin 7, first seal 81, second seal 82, cushioning cotton 83. Ignition structure 9, ignition tube 91, mounting base 92. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The following is for reference. Figures 1-20 A pin puller 100 according to an embodiment of the present invention is described. The pin puller 100 has a very low impact response and noise, will not damage surrounding components and structures, and has a small and regular structure, which is easy to manufacture and occupies little space.

[0024] like Figures 1-20 As shown, a pin puller 100 according to an embodiment of the present invention includes: a housing 1, a medicine box 2, an inner housing 3, and a piston 4.

[0025] The outer shell 1 is the main external structure of the pin puller 100. Its interior is hollow to provide a mounting base for internal components (medicine box 2, inner shell 3, piston 4, etc.), ensure that each component maintains a stable relative position to achieve its function, and protect the internal components from damage by the external environment.

[0026] The medicine box 2 is used to hold gas-producing drugs and other fuels that can generate gas. Once ignited, the fuel instantly produces a large amount of high-pressure, high-temperature gas. The inner shell 3 is an internal shell component that provides space for the movement of the piston 4, ensuring its mobility. Both the medicine box 2 and the inner shell 3 are installed inside the outer shell 1 to effectively protect them. Simultaneously, the outer shell 1 seals the medicine box 2 and the inner shell 3 to prevent the gas generated inside the medicine box 2 from leaking to the outside. Furthermore, the medicine box 2 is connected to the inner shell 3, allowing the high-pressure, high-temperature gas generated inside the medicine box 2 to flow into the inner shell 3.

[0027] Piston 4 is a movable moving part. The interior of the inner shell 3 is hollow, and the outer shell 1 is provided with a through hole 11 so that one end of piston 4 can be located inside the inner shell 3 and the other end can pass through the through hole 11 to extend outside the outer shell 1. In this way, the high temperature and high pressure gas flowing into the inner shell 3 can act on one end of piston 4 to push piston 4 to move. When piston 4 moves, it will directly act on the pin or connector to disconnect the pin or connector from another connector, thereby realizing the removal or release of the pin, detaching the connection between the pin and another connector, and realizing the release of the other connector.

[0028] Furthermore, the medicine box 2 and the inner shell 3 are distributed along the movement direction of the piston 4. The gas generated after the fuel in the medicine box 2 is ignited is suitable to enter the inner shell 3 and push the piston 4 to move in the inner shell 3 towards the medicine box 2.

[0029] Specifically, after the fuel is ignited inside the medicine box 2, the high-temperature and high-pressure gas generated flows into the inner shell 3 and acts on the end of the piston 4 located inside the inner shell 3. This results in a lower pressure on the side of the piston 4 facing inwards from the inner shell 3 and a higher pressure on the side facing outwards from the inner shell 3, creating a pressure difference between the two sides of one end of the piston 4. The high-temperature and high-pressure gas pushes the piston 4 towards the interior of the inner shell 3. The inner shell 3 can deform to absorb impact stress and the impact energy of fuel combustion itself, reducing the impact force of the piston 4 on the outer shell 1 and other surrounding structures, and reducing noise generation. Since the medicine box 2 and the inner shell 3 are distributed along the direction of piston 4's movement, when the piston 4 moves to the innermost end of the inner shell 3... At that time, the impact force of piston 4 can be transmitted to the powder box 2, and the impact energy on the inner shell 3 can be transmitted to the powder box 2. The powder box 2 can deform to further absorb the impact stress and the impact energy of the fuel combustion itself. In other words, the powder box 2 and the inner shell 3 can act as energy-absorbing boxes to absorb impact vibration. Thus, through the collapse deformation of the inner shell 3 and the powder box 2, the impact stress and the impact energy of the gunpowder itself can be effectively dissipated. Moreover, the direct impact object of piston 4 is the inner shell 3, and piston 4 does not directly impact the outer shell 1. This greatly reduces the overall impact response and noise of the pin puller 100, avoids the generation of violent stress, and thus avoids damage to surrounding components and structures.

[0030] Reference Appendix Figure 2 and attached Figure 3 As shown, the medicine box 2 and the inner shell 3 can be distributed along the axial direction of the outer shell 1. The outer shell 1, the inner shell 3, and the piston 4 can be distributed coaxially. The piston 4 moves in the left-right direction, that is, the distribution direction from the inner shell 3 to the medicine box 2. It should be noted that the fuel in the medicine box 2 can be set as a gas-producing drug. The amount of gas-producing drug is determined by the required pin-pulling force. By adjusting the amount of gas-producing drug, the pin-pulling force can be adjusted, thereby making the application scenarios of the pin puller 100 more extensive and able to cope with various working conditions.

[0031] According to the embodiment of the present invention, the pin puller 100 allows the piston 4 to move within the inner shell 3 by placing one end of the piston 4 inside the inner shell 3 and extending the other end outside the outer shell 1. By distributing the medicine box 2 and the inner shell 3 along the direction of piston 4's movement, the gas generated after the fuel in the medicine box 2 is ignited can enter the inner shell 3 and act on the piston 4, pushing the piston 4 to move closer to the medicine box 2 within the inner shell 3. Thus, the impact force can be transmitted from the inner shell 3 to the medicine box 2. The deformation of the inner shell 3 and the medicine box 2 absorbs most of the impact stress and the impact energy of the fuel combustion itself, thereby greatly reducing the overall impact response and noise of the pin puller 100. That is, the impact response and noise generated to the surroundings are very small, avoiding damage to surrounding components and structures. The overall structure of the pin puller 100 is small and regular, easy to manufacture, and occupies little space.

[0032] In some embodiments, a collapsible inlet 31 is formed inside the inner shell 3, which opens toward the piston 4. One end of the piston 4 is provided with a first collapsible protrusion 41. The first collapsible protrusion 41 is adapted to be inserted into the collapsible inlet 31 when the piston 4 moves toward the medicine box 2, and to press against the inner peripheral wall of the collapsible inlet 31.

[0033] Specifically, such as Figure 2 and Figure 3 As shown, the inner shell 3 has a collapsible inlet 31 that opens towards the piston 4. The end of the piston 4 closest to the inside of the inner shell 3 is... Figure 2 and Figure 3 As shown, a first collapsible protrusion 41 is provided at the left end. The first collapsible protrusion 41 protrudes towards the collapsible inlet 31. The shape and size of the collapsible inlet 31 are adapted to the shape and size of the first collapsible protrusion 41. Thus, after the pin is pulled out, the piston 4 is pushed by high-temperature and high-pressure gas and moves at high speed toward the medicine box 2. When the piston 4 moves to the innermost end of the inner shell 3, the first collapsible protrusion 41 can be inserted into the collapsible inlet 31, so that the outer peripheral wall of the first collapsible protrusion 41 is tightly pressed against the inner peripheral wall of the collapsible inlet 31, realizing the interference fit between the collapsible inlet 31 and the first collapsible protrusion 41. This fixes the piston 4 in this position, preventing the piston 4 from rebounding due to the stress generated by the piston 4 rushing toward the end of the inner shell 3 near the medicine box 2, that is, preventing the piston 4 from... Figure 2 and Figure 3 The movement to the right as shown in the figure causes the pin puller 100 to fail. At the same time, the first collapsible protrusion 41 is inserted into the collapsible socket 31, which also absorbs part of the impact force when the piston 4 hits the end of the inner shell 3 near the medicine box 2, further reducing the overall impact response and noise of the pin puller 100.

[0034] Therefore, by inserting the first collapsible protrusion 41 into the collapsible socket 31, the piston 4 is prevented from rebounding, making the pin puller 100 suitable for working conditions that require greater pin pulling force. In other words, even if the impact force on the piston 4 is too great, the insertion and engagement of the first collapsible protrusion and the collapsible socket 31 will absorb part of the impact force, thereby reducing the impact force on the piston 4 and preventing the piston 4 from rebounding after the pin is pulled out. At the same time, this structure also effectively prevents the risk caused by the rebound of the piston 4.

[0035] It should be noted that the outer diameter of the first collapsible boss 41 can be set to be larger than the inner diameter of the collapsible socket 31. This allows the first collapsible boss 41 to be inserted into the collapsible socket 31 at high speed when the piston 4 is subjected to the impact of high temperature and high pressure gas, forming an interference fit. This makes the connection between the collapsible socket 31 and the first collapsible boss 41 tighter and more secure, effectively preventing the piston 4 from falling off, that is, preventing the first collapsible boss 41 from coming out of the collapsible socket 31.

[0036] In some embodiments, the outer diameter of the first collapsible boss 41 is configured to gradually decrease along the direction close to the collapsible socket 31.

[0037] Specifically, the shape of the first collapsible protrusion 41 can be set as conical, stepped shaft, curved, etc., so that the outer diameter of the first collapsible protrusion 41 gradually decreases along the direction close to the collapsible socket 31. This can form a guiding effect, so that the first collapsible protrusion 41 can be inserted into the collapsible socket 31 more smoothly. This structure also allows the first collapsible protrusion 41 to be inserted into the collapsible socket 31 with a certain angle offset, which increases compatibility. As the insertion depth increases, the larger outer diameter part can generate greater radial pressure with the inner peripheral wall of the collapsible socket 31, forming a tighter interference fit and increasing friction. This makes the connection between the first collapsible protrusion 41 and the collapsible socket 31 more secure, effectively preventing the first collapsible protrusion 41 from coming out of the collapsible socket 31.

[0038] For example, such as Figure 2 and Figure 3 As shown, the portion of the first collapsible protrusion 41 near the collapsible socket 31 is constructed as a conical structure, meaning that the outer diameter of this portion of the first collapsible protrusion 41 gradually decreases. The portion of the first collapsible protrusion 41 away from the collapsible socket 31 is constructed as a cylindrical structure, meaning that the outer diameter of this portion of the first collapsible protrusion 41 remains unchanged. Of course, the entire first collapsible protrusion 41 can also be constructed as a conical structure, and the shape of the corresponding collapsible socket 31 can be set as cylindrical, meaning that the inner diameter of the collapsible socket 31 can remain unchanged.

[0039] In other embodiments, the inner diameter of the collapsible socket 31 is configured to gradually decrease in the direction away from the piston 4.

[0040] Specifically, the shape of the collapsible socket 31 can be set as conical, stepped shaft, curved, etc., so that the outer diameter of the collapsible socket 31 gradually decreases in the direction away from the piston 4. Thus, the opening end with a larger radial dimension can play a guiding role, guiding the first collapsible boss 41 to be smoothly inserted into the collapsible socket 31. The opening end with a larger radial dimension allows the first collapsible boss 41 to have a certain offset, without the need for precise alignment. As the insertion depth increases, the outer peripheral wall of the part with a smaller radial dimension of the collapsible socket 31 can generate greater radial pressure on the outer peripheral wall of the first collapsible boss 41, forming a tighter interference fit and increasing friction. This makes the connection between the first collapsible boss 41 and the collapsible socket 31 more secure, effectively preventing the first collapsible boss 41 from coming out of the collapsible socket 31.

[0041] In some embodiments, the inner shell 3 has a second collapsible protrusion 33 protruding axially at the end away from the piston 4, and a collapsible inlet 31 is formed on the side of the second collapsible protrusion 33 facing the inner shell 3, and the second collapsible protrusion 33 presses against the medicine box 2.

[0042] Specifically, such as Figure 1 and Figure 3 As shown, the left end of the inner shell 3, that is, the end of the inner shell 3 away from the piston 4, is formed with a second collapsible protrusion 33 protruding along the axial direction, and the second collapsible protrusion 33 protrudes towards the medicine box 2. Thus, a collapsible insertion port 31 is formed on the side of the second collapsible protrusion 33 facing the inside of the inner shell 3. At the same time, the outer bottom wall of the second collapsible protrusion 33, that is, the side of the second collapsible protrusion 33 away from the inside of the inner shell 3, is pressed against the end face of the medicine box 2.

[0043] Thus, by setting the second collapsible protrusion 33, a collapsible insertion port 31 is formed, and the connection between the medicine box 2 and the inner shell 3 is realized. This ensures that the medicine box 2 and the inner shell 3 are relatively fixed in position inside the outer shell 1, which facilitates the smooth flow of gas generated in the medicine box 2 into the inner shell 3 and prevents the position of the inner shell 3 relative to the medicine box 2 from changing, so that the gas in the medicine box 2 cannot smoothly enter the inner shell 3.

[0044] In some embodiments, a shrinkage groove 21 is formed at one end of the medicine box 2 facing the inner shell 3, and a second shrinkage protrusion 33 is distributed opposite to the shrinkage groove 21, with at least a portion of the second shrinkage protrusion 33 extending into the shrinkage groove 21.

[0045] Specifically, such as Figure 2 , Figure 3 and Figure 10 As shown, Figure 2 and Figure 3As shown in the left-right direction, a shrinkage groove 21 is formed at the right end of the medicine box 2, that is, the end of the medicine box 2 facing the inner shell 3. The shape and size of the shrinkage groove 21 are adapted to the second shrinkage protrusion 33 and the two are directly opposite each other. In this way, at least a part of the second shrinkage protrusion 33 can smoothly extend into the shrinkage groove 21, so that the outer peripheral wall of the second shrinkage protrusion 33 is tightly pressed against the inner peripheral wall of the shrinkage groove 21, realizing the limiting cooperation between the second shrinkage protrusion 33 and the shrinkage groove 21, realizing the radial and axial limiting of the inner shell 3, preventing the inner shell 3 from shifting in the axial and radial directions, and the position of the inner shell 3 can remain stable even in the event of fire or vibration impact.

[0046] Furthermore, the structural connection between the medicine box 2 and the inner shell 3 is achieved through the cooperation of the second collapsible protrusion 33 and the collapsible groove 21. In this way, the impact force after the pin is pulled out can be smoothly transmitted from the inner shell 3 to the medicine box 2 through the second collapsible protrusion 33 and the collapsible groove 21, ensuring the stable transmission of the impact force and preventing it from impacting the outer shell 1, thus preventing the entire pin puller 100 from generating excessive vibration and impact response.

[0047] Furthermore, the medicine box 2 is provided with multiple air vents 22 distributed around the collapse sink 21, and the gas inside the medicine box 2 is suitable to flow from the air vents 22 to the inner shell 3.

[0048] In other words, the medicine box 2 is provided with two, three, four or even more vent holes 22, and the multiple vent holes 22 are relatively evenly distributed around the collapse groove 21. The gas in the medicine box 2 can flow out from the vent holes 22 and flow into the inner shell 3, thereby acting on the piston 4 and pushing the piston 4 to move. At the same time, the fuel will not be blown out of the medicine box 2, which can maintain the stability of fuel combustion.

[0049] This design not only shortens the gas flow path, allowing the gas to flow quickly into the inner shell 3, but also allows the collapsible sink 21 and multiple vents 22 to work together to weaken the outer structure of the collapsible sink 21, i.e., lower structural strength and rigidity. This makes the medicine box 2 more prone to collapse and deformation, thereby facilitating the absorption of impact energy and reducing impact response and noise. In other words, when the piston 4 moves to the innermost end of the inner shell 3, the medicine box 2 can undergo significant deformation under the pressure of the inner shell 3 to absorb more impact energy, reduce the overall impact energy, and reduce the impact on the outer shell 1.

[0050] By setting multiple vent holes 22, the gas generated inside the medicine box 2 can flow rapidly into the inner shell 3 at multiple locations through multiple vent holes 22, thereby quickly pushing the piston 4 to move. It also helps to apply pressure relatively evenly to the entire surface of the piston 4, so as to push the piston 4 to move stably towards the medicine box 2, preventing uneven local pressure on the piston 4, which may lead to failure to pull out the pin, or cause the piston 4 to deviate or get stuck.

[0051] In some embodiments, the inner peripheral wall of the outer shell 1 is spaced apart from the outer peripheral wall of the inner shell 3 to define an airflow channel 51. One end of the airflow channel 51 is connected to the medicine box 2, and the other end of the airflow channel 51 is connected to the end of the inner shell 3 away from the medicine box 2.

[0052] Specifically, such as Figure 2 and Figure 3 As shown, the radial dimension of the inner peripheral wall of the outer shell 1 is larger than the radial dimension of the outer peripheral wall of the inner shell 3, so that the inner peripheral wall of the outer shell 1 and the outer peripheral wall of the inner shell 3 are separated by a certain distance to form an annular airflow channel 51. The left end of the airflow channel 51 is connected to the medicine box 2, and the right end of the airflow channel 51 is connected to the right end of the inner shell 3, that is, the end away from the medicine box 2. Thus, the airflow channel 51 connects the medicine box 2 and the inner shell 3. The gas in the medicine box 2 can flow through the airflow channel 51 to the inner shell 3, and then act on the piston 4 to push the piston 4 to move.

[0053] The annular airflow channel 51 allows the high-pressure, high-temperature gas inside the medicine box 2 to flow quickly into the inner shell 3 and act relatively evenly on the surface of the piston 4, thereby driving the piston 4 to move stably along the axial direction and preventing the piston 4 from deviating.

[0054] In some embodiments, the pin puller 100 further includes an air guide ring 6, which is sleeved on the piston 4 and located between the end of the inner shell 3 away from the medicine box 2 and the inner end face of the outer shell 1. The air guide ring 6 is provided with an air guide groove 61, and the airflow channel 51 is connected to the end of the inner shell 3 away from the medicine box 2 through the air guide groove 61.

[0055] Specifically, such as Figures 2-4 As shown, the pin puller 100 also includes a gas guide ring 6. The gas guide ring 6 is annular in structure, sleeved on the outside of the piston 4, and located at the end of the inner shell 3 away from the medicine box 2. Figure 2 and Figure 3 The right end shown is positioned between the right end and the inner right end face of the outer casing 1, thereby fixing the air guide ring 6 in place and preventing it from moving.

[0056] The piston 4 has an open end on the right. The air guide ring 6 is provided with an air guide groove 61. The air guide groove 61 extends radially and is open towards the inside of the inner shell 3. The air flow channel 51 is connected to the end of the inner shell 3 away from the medicine box 2 through the air guide groove 61. Thus, the gas generated in the medicine box 2 can enter the air guide groove 61 through the air flow channel 51, and then enter the inner shell 3 through the air guide groove 61, thereby acting on the surface of the piston 4 and pushing the piston 4 towards the inside of the inner shell 3, that is, towards the end of the inner shell 3 closer to the medicine box 2.

[0057] In practical design, such as Figure 6As shown, an installation groove 62 can be provided at one end of the air guide ring 6 facing the inner shell 3. The installation groove 62 matches the open end of the inner shell 3, so that at least part of the open end of the inner shell 3 extends into the installation groove 62, thereby realizing the installation and cooperation between the air guide ring 6 and the inner shell 3. Thus, one end of the inner shell 3 is limited by the medicine box 2, and the other end of the inner shell 3 is limited by the air guide ring 6, so that the inner shell 3 is kept in a stable position, thereby keeping the shape of the airflow channel 51 stable. Even under the condition of ignition or vibration and impact, it can still remain stable and realize the smooth flow of airflow.

[0058] The inner shell 3 is connected to the internal air guide groove 61. At the same time, the position of the inner shell 3 is stable. This arrangement allows the gas in the airflow channel 51 to flow smoothly into the inner shell 3, and also prevents the inner shell 3 from being completely fixed in the axial direction, which can reduce the impact at the moment of action.

[0059] In some embodiments, the pin puller 100 further includes a shear pin 7, which is inserted into the air guide ring 6 and the piston 4, and the insertion direction of the shear pin 7 intersects with the movement direction of the piston 4.

[0060] Specifically, such as Figure 4 As shown, the pin puller 100 also includes a shearing pin 7. When the shearing force on the shearing pin 7 exceeds the set shearing force value of the shearing pin 7, the shearing pin 7 will break at the shearing surface, thereby causing the connection to fail. For example, Figure 3 and Figure 4 As shown, a first pin hole 63 can be provided on the gas guide ring 6, and a second pin hole 46 can be provided on the outer peripheral wall of the piston 4. The shear pin 7 is inserted into the first pin hole 63 and the second pin hole 46 in sequence to achieve a fixed connection between the gas guide ring 6 and the piston 4, so that the gas guide ring 6 and the piston 4 maintain a stable connection state and the piston 4 remains in a stable position.

[0061] The insertion direction of the shear pin 7 is radial to that of the piston 4, and the movement direction of the piston 4 is axial. Thus, the insertion direction of the shear pin 7 is perpendicular to the movement direction of the piston 4. When the piston 4 is subjected to instantaneous high-pressure and high-temperature gas, it will move into the inner shell 3 under great pressure, causing the shear pin 7 to break under shear force, thereby realizing the pin removal.

[0062] It should be noted that the initial acceleration of the pin puller 100 and its ability to withstand external vibrations or strong impacts can be adjusted by changing the radial dimension and material of the shear pin 7. In other words, the radial dimension of the shear pin 7 can be set to be larger, or the material stiffness can be made to be greater, so that the initial acceleration of the pin puller 100 is greater, that is, the initial acceleration of the piston 4 is greater, which can withstand greater external vibrations or impacts and prevent the shear pin 7 from breaking when subjected to strong external vibrations or impacts, which would cause the piston 4 to separate from the air guide ring 6 and the connection to fail.

[0063] And by inserting the shear pin 7 into the air guide ring 6 and the piston 4 in sequence, the piston 4 and the air guide ring 6 are initially locked. Compared with the conventional method of initial locking by interference fit, this setting method requires more controllable and stable initial power, will not easily fail to connect, and the initial power can be flexibly adjusted according to different working conditions.

[0064] In other embodiments, there are two shear pins 7, which are distributed opposite each other along the radial direction of the air guide ring 6.

[0065] In other words, the piston 4 and the guide ring 6 are connected by two shear pins 7 for initial locking. The two shear pins 7 can share the load, reducing the load on a single shear pin 7, thereby reducing the risk of breakage of a single shear pin 7. This solves the reliability problem of the pin puller 100 under high overload conditions. Moreover, compared with the single-sided shear pin 7, the double-sided shear pins 7 can make the piston 4 more evenly stressed, eliminating the risk of piston 4 deflection or jamming.

[0066] It should be noted that the shear pins 7 can also be set to three, four, etc., which can be flexibly set according to the actual situation. Three shear pins 7 can be distributed relatively evenly along the circumference of the guide ring 6, and four shear pins 7 can be distributed in pairs along the radial direction to make the piston 4 more controllable and reliable.

[0067] In some embodiments, a first seal 81 is provided between the piston 4 and the inner peripheral wall of the inner shell 3.

[0068] Specifically, such as Figure 2 As shown, a first sealing element 81 is provided between the piston 4 and the inner peripheral wall of the inner shell 3. The inner end of the first sealing element 81 is tightly pressed against the outer peripheral wall of the piston 4, and the outer end of the first sealing element 81 is tightly pressed against the inner peripheral wall of the inner shell 3. Thus, the first sealing element 81 is tightly pressed and connected between the outer peripheral wall of the piston 4 and the inner peripheral wall of the inner shell 3, preventing gaps from forming between the piston 4 and the inner shell 3, which would cause gas in the air guide groove 61 to enter the interior of the inner shell 3 and affect the movement effect of the piston 4.

[0069] In other embodiments, multiple first seals 81 can be provided, for example, two or three first seals 81 can be provided, so that the piston 4 and the inner peripheral wall of the inner shell 3 can be sealed at multiple locations by multiple first seals 81, thereby improving the sealing effect between the piston 4 and the inner peripheral wall of the inner shell 3. When one of the first seals 81 fails, the other first seals 81 can still work normally to seal.

[0070] In other embodiments, such as Figure 2 As shown, the outer peripheral wall of the piston 4 is provided with a first sealing groove 42, and the first sealing element 81 is installed in the first sealing groove 42. This ensures that the installation position of the first sealing element 81 is fixed and prevents the first sealing element 81 from shifting.

[0071] In other embodiments, a second seal 82 is provided between the piston 4 and the inner peripheral wall of the housing 1.

[0072] Specifically, such as Figure 2 As shown, a second seal 82 is provided between the outer peripheral wall of the piston 4 and the inner peripheral wall of the outer shell 1. The inner end of the second seal 82 is tightly pressed against the outer peripheral wall of the piston 4, and the outer end of the second seal 82 is tightly pressed against the inner peripheral wall of the outer shell 1. Thus, the second seal 82 is tightly pressed and connected between the outer peripheral wall of the piston 4 and the inner peripheral wall of the outer shell 1, preventing gaps from forming between the piston 4 and the outer shell 1, which would cause gas in the air guide groove 61 to leak to the outside and affect the movement of the piston 4.

[0073] In other embodiments, multiple second seals 82 may be provided. For example, two or three second seals 82 may be provided, so that the piston 4 and the outer peripheral wall of the housing 1 can be sealed at multiple locations by multiple second seals 82, thereby improving the sealing effect between the piston 4 and the inner peripheral wall of the housing 1. When one of the second seals 82 fails, the other second seals 82 can still work normally to seal.

[0074] In other embodiments, such as Figure 2 As shown, the inner peripheral wall of the outer casing 1 is provided with a second sealing groove 12, and the second sealing element 82 is installed in the second sealing groove 12. This ensures that the installation position of the second sealing element 82 is fixed and prevents the second sealing element 82 from shifting.

[0075] In other embodiments, the outer casing 1 is also equipped with an ignition structure 9, which is located at the end of the medicine box 2 opposite to the inner casing 3.

[0076] Specifically, such as Figure 2As shown, the outer casing 1 is also equipped with an ignition structure 9. The outer casing 1 has a mounting port 13. The ignition structure 9 is installed at the mounting port 13 and located at the end of the medicine box 2 away from the inner casing 3. The ignition structure 9 includes an ignition tube 91 and a mounting base 92. The ignition tube 91 is fixed to the mounting base 92 by riveting the receiving port. The mounting base 92 is threaded or welded to the mounting port 13. At least a portion of the ignition tube 91 extends into the medicine box 2. When it receives an electrical signal from the upper system, the bridge wire inside the ignition tube 91 heats up under the action of the current, igniting the fuel in the medicine box 2, thereby producing gas.

[0077] Silicone, such as 704 silicone rubber, can be applied to the riveting gap of the ignition tube 91 to make the ignition tube 91 more stably installed on the mounting base 92. At the same time, the riveting is sealed to prevent gas from leaking from the medicine box 2. Silicone, such as 704 silicone rubber, can also be applied to the threaded connection or weld between the mounting base 92 and the mounting port 13 to seal the threaded connection or weld between the mounting base 92 and the mounting port 13 and prevent gas from leaking from the medicine box 2.

[0078] In other embodiments, the first seal 81 and the second seal 82 are configured as sealing rings, thereby achieving a tight circumferential seal and improving sealing performance.

[0079] In other embodiments, the inner end of the medicine box 2, away from the inner shell 3, is provided with cushioning cotton 83.

[0080] Specifically, such as Figure 2 As shown, a buffer cotton 83 is provided at the inner end of the medicine box 2 away from the inner shell 3. The buffer cotton 83 is sleeved on the outside of the end of the ignition tube 91. In this way, the fuel that produces gas in the medicine box 2 can be sealed inside the medicine box 2, preventing the fuel from moving away from the ignition tube 91 due to shaking or other reasons, which would prevent the ignition tube 91 from igniting the fuel.

[0081] In other embodiments, such as Figure 3 As shown, the piston 4 includes a connected piston head 44 and a piston rod 45. The radial dimension of the piston head 44 is larger than that of the piston rod 45. The piston head 44 is located inside the inner shell 3, and the piston rod 45 passes through the outer shell 1 and extends outside the outer shell 1. The first collapsible protrusion 41 is provided on one side end face of the piston head 44. The other side end face of the piston head 44 is directly opposite to the gas guide ring 6. One side end face of the piston head 44 is at normal pressure. High temperature and high pressure gas can directly act on the other side end face of the piston head 44 through the gas guide groove 61 to push the piston head 44 to move towards the medicine box 2 inside the inner shell 3.

[0082] In other embodiments, such as Figure 3As shown, the piston 4 is provided with an axially extending vent hole 43, which is connected to the interior of the inner shell 3, so that the interior of the inner shell 3 is connected to the external environment through the vent hole 43. Thus, when the piston 4 moves in the inner shell 3 toward the medicine box 2, the gas inside the inner shell 3 can flow to the outside in time to prevent the piston 4 from being obstructed.

[0083] The installation method of the pin puller 100 of the present invention is as follows: First, the shear pin 7 is inserted into the gas guide ring 6 and the piston 4 to connect the gas guide ring 6 and the piston 4 together through the shear pin 7. Then, the first seal 81 is installed in the first sealing groove 42 of the piston 4, and the piston head 44 is installed into the inner shell 3, with the open end of the inner shell 3 fitting into the mounting groove 62 of the gas guide ring 6. The second seal 82 is installed in the second sealing groove 12 of the outer shell 1. Then, the assembled gas guide ring 6, piston 4 and inner shell 3 are installed into the outer shell 1 together, so that the piston rod 45 passes through the through hole 11 of the outer shell 1. Then, the medicine box 2 is installed into the outer shell 1, so that the second collapsible protrusion 33 of the inner shell 3 extends into the collapsible recess 21 of the medicine box 2, and then the fuel is loaded into the medicine box 2. Finally, the ignition structure 9 is installed at the end of the medicine box 2 away from the inner shell 3.

[0084] It should be noted that in the pin puller 100 of the present invention, one end of the outer shell 1 is sealed with a second sealing element 82, and the other end of the outer shell 1 is sealed with adhesive, thereby achieving an overall all-round seal of the pin puller 100, completely isolating the space inside the medicine box 2 and the piston 4 from the outside world, thereby improving the reliability and sealing performance of the pin puller 100. When in operation, there is no spark, no noise, and no contents flying out, and it can still function under water immersion conditions.

[0085] The present invention also proposes a vehicle.

[0086] The vehicle according to an embodiment of the present invention includes the pin puller 100 of any of the above embodiments.

[0087] According to the vehicle of the present invention, by placing one end of the piston 4 inside the inner shell 3 and extending the other end outside the outer shell 1, the piston 4 can move inside the inner shell 3. By distributing the medicine box 2 and the inner shell 3 along the direction of movement of the piston 4, the gas generated after the fuel in the medicine box 2 is ignited can enter the inner shell 3 and act on the piston 4 to push the piston 4 to move in the direction closer to the medicine box 2 inside the inner shell 3. Thus, the impact force can be transmitted from the inner shell 3 to the medicine box 2. The deformation of the inner shell 3 and the medicine box 2 absorbs most of the impact stress and the impact energy of the fuel combustion itself, thereby greatly reducing the overall impact response and noise of the pin puller 100. That is, the impact response and noise generated to the surroundings are very small, avoiding damage to surrounding components and structures. Moreover, the overall structure of the pin puller 100 is small and regular, easy to manufacture, and occupies little space.

[0088] It should be noted that the pin puller 100 of this invention is small and regular in size, without any irregular shape or deformation after use. It can be installed in places with limited space, such as inside a seat. This allows the seat to return to its forward position when it is subjected to a strong impact and tilts backward too far. The shearing force required to cut the pin 7 is very large, enabling it to withstand significant acceleration impacts without failure, thus adapting to various vehicle collision conditions. Of course, it can also be applied to other structures and can be flexibly configured according to actual conditions, not limited to the embodiments described herein.

[0089] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0090] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pin puller, characterized in that, include: Outer shell (1); Medicine box (2) and inner shell (3), both medicine box (2) and inner shell (3) are installed inside the outer shell (1), and medicine box (2) and inner shell (3) are in communication; Piston (4), one end of which is located inside the inner shell (3) and the other end extends outside the outer shell (1); The medicine box (2) and the inner shell (3) are distributed along the movement direction of the piston (4). The gas generated after the fuel in the medicine box (2) is ignited is suitable to enter the inner shell (3) and push the piston (4) to move in the inner shell (3) towards the medicine box (2).

2. The pin puller according to claim 1, characterized in that, The inner shell (3) has a collapsible socket (31) that opens toward the piston (4). One end of the piston (4) is provided with a first collapsible protrusion (41). The first collapsible protrusion (41) is adapted to be inserted into the collapsible socket (31) when the piston (4) moves toward the medicine box (2) and presses against the inner peripheral wall of the collapsible socket (31).

3. The pin puller according to claim 2, characterized in that, The outer diameter of the first collapsible boss (41) is configured to gradually decrease along the direction close to the collapsible socket (31); And / or, the inner diameter of the collapsible socket (31) is configured to gradually decrease in the direction away from the piston (4).

4. The pin puller according to claim 2, characterized in that, The inner shell (3) has a second collapsible protrusion (33) protruding axially at one end away from the piston (4). The collapsible inlet (31) is formed on the side of the second collapsible protrusion (33) facing the inner shell (3). The second collapsible protrusion (33) presses against the medicine box (2).

5. The pin extractor of claim 4, wherein, The medicine box (2) has a shrinkage groove (21) formed at one end facing the inner shell (3), and the second shrinkage protrusion (33) is distributed opposite to the shrinkage groove (21), and at least a portion of the second shrinkage protrusion (33) extends into the shrinkage groove (21). The medicine box (2) is provided with a plurality of air vents (22) distributed around the collapse sink (21), and the gas in the medicine box (2) is adapted to flow from the air vents (22) to the inner shell (3).

6. The pin extractor of claim 1, wherein The inner peripheral wall of the outer shell (1) is spaced apart from the outer peripheral wall of the inner shell (3) to define an airflow channel (51). One end of the airflow channel (51) is connected to the medicine box (2), and the other end of the airflow channel (51) is connected to the end of the inner shell (3) away from the medicine box (2).

7. The pin extractor of claim 6, wherein, It also includes a gas guide ring (6), which is sleeved on the outside of the piston (4), and the gas guide ring (6) is located between the end of the inner shell (3) away from the medicine box (2) and the inner end face of the outer shell (1). The gas guide ring (6) is provided with a gas guide groove (61), and the airflow channel (51) is connected to the end of the inner shell (3) away from the medicine box (2) through the gas guide groove (61).

8. The pin extractor of claim 7, wherein, It also includes a shear pin (7), which is inserted into the air guide ring (6) and the piston (4), and the insertion direction of the shear pin (7) intersects with the movement direction of the piston (4).

9. The pin extractor according to claim 1, wherein, A first sealing element (81) is provided between the piston (4) and the inner peripheral wall of the inner shell (3). And / or, a second seal (82) is provided between the piston (4) and the inner peripheral wall of the housing (1). And / or, the outer casing (1) is also equipped with an ignition structure (9), the ignition structure (9) being located at one end of the medicine box (2) away from the inner casing (3); And / or, the inner end of the medicine box (2) away from the inner shell (3) is provided with cushioning cotton (83).

10. A vehicle characterized by comprising: The pin puller includes any one of claims 1-9.

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