Air pressure ejection piston for unmanned aerial vehicle

Abstract

The air pressure ejection piston comprises a piston cylinder and a piston body arranged in the piston cylinder in a sliding mode, a locking cylinder is arranged in one end of the piston cylinder, a locking hole is formed in the end, close to the locking cylinder, of the piston body, and the locking cylinder is sleeved with the locking hole in a sliding mode. An elastic locking part movably connected with the outer wall of the locking cylinder in a clamped mode is arranged on the hole wall of the locking hole, an unlocking air inlet channel is formed in the locking cylinder, and the air outlet end of the unlocking air inlet channel corresponds to the elastic locking part; an ejection air inlet channel is arranged at one end of the piston cylinder; according to the utility model, the piston can be axially locked in a non-ejection state, so that the axial movement of the piston is avoided; and in the ejection state, the piston can be axially unlocked and is driven to quickly and axially move, so that the unmanned aerial vehicle is driven to perform high-speed pneumatic ejection.

Description

Technical Field

[0001] The utility model belongs to the technical field of unmanned aerial vehicle ejection, and relates to a pneumatic ejection piston for a unmanned aerial vehicle. Background Art

[0002] The existing methods for UAVs to accelerate and take off over short distances include rocket-assisted zero-length launch and hydraulic ejection. The rocket-assisted launch method has the disadvantages of difficult transportation and storage of the incendiary items required for launch, and the heat generated when the incendiary items are ignited and launched is easy to monitor, and it pollutes the environment. The hydraulic ejection method, which uses hydraulic power to eject UAVs, is difficult to control hydraulic pressure, requires a large space to arrange the entire hydraulic pipeline system, and has very strict sealing requirements for the hydraulic pipeline. If there is a slight leak in the hydraulic pipeline system, the pressure of the entire hydraulic ejection system will drop instantly, and ultimately the smooth ejection of the UAV cannot be guaranteed.

[0003] Based on the defects of rocket-assisted zero-length launch and hydraulic ejection, the existing technology also uses pneumatic ejection, which uses high-pressure gas to drive the piston to move quickly, and further drives the UAV to eject through the piston. However, the existing pneumatic ejection piston lacks a locking device. In the non-ejection state, the piston will move due to the vibration during transportation, which will affect the accuracy of subsequent high-speed pneumatic ejection of the UAV.

[0004] Therefore, in order to solve the technical problem that the existing pneumatic ejection piston lacks a locking device, which causes the piston to easily move in a non-ejection state, the utility model discloses a pneumatic ejection piston for a drone. Utility Model Content

[0005] The purpose of the utility model is to provide a pneumatic ejection piston for a drone, which can axially lock the piston in a non-ejection state to prevent the piston from axial movement; in the ejection state, the piston can be axially unlocked and driven to move axially quickly, thereby driving the drone to perform high-speed pneumatic ejection.

[0006] The utility model is realized by the following technical solutions:

[0007] A pneumatic ejection piston for an unmanned aerial vehicle comprises a piston cylinder and a piston slidably arranged inside the piston cylinder, a locking cylinder is arranged inside one end of the piston cylinder, a locking hole is arranged at one end of the piston close to the locking cylinder, the locking hole is slidably sleeved on the outside of the locking cylinder, an elastic locking portion movably engaged with the outer wall of the locking cylinder is arranged on the hole wall of the locking hole, an unlocking air inlet is arranged inside the locking cylinder, and an air outlet end of the unlocking air inlet is arranged corresponding to the elastic locking portion; an ejection air inlet is arranged on one end of the piston cylinder.

[0008] The piston is provided with a connecting portion extending to the outside of the piston cylinder at one end away from the ejection air inlet, and the connecting portion is connected to the UAV ejection base arranged on the ejection frame. The ejection air inlet is connected to an external first high-pressure air source, and the unlocking air inlet is connected to an external second high-pressure air source.

[0009] There is no need to perform pneumatic ejection of the drone. The first high-pressure air source and the second high-pressure air source are shut down. At this time, the elastic locking part on the hole wall of the locking hole is engaged with the hole wall of the locking hole under the action of its own elasticity, thereby achieving axial locking of the piston and avoiding loosening of the piston during transportation of the drone system.

[0010] When the drone needs to be pneumatically ejected, the second high-pressure gas source inputs high-pressure gas to the unlocking air inlet, and the air pressure pushes the elastic locking part at the air outlet end of the unlocking air inlet, so that the elastic locking part is compressed and separated from the outer wall of the locking cylinder, ensuring that the locking cylinder and the locking hole are in an unlocked state. Then, the first high-pressure gas source inputs high-pressure gas into the interior of the piston cylinder, and the high-pressure gas acts on the end face of the piston, pushing the unlocked piston to quickly eject along the axial direction of the piston cylinder, and then the piston drives the drone ejection base to eject along the ejection frame, finally realizing high-speed pneumatic ejection of the drone.

[0011] In order to better realize the utility model, further, a plurality of elastic locking parts are evenly distributed on the hole wall of the locking hole along the circumferential direction, and a plurality of card grooves movably engaged with the elastic locking parts are arranged on the cylinder wall of the locking cylinder along the circumferential direction, and the card grooves are connected to the air outlet end of the unlocking air inlet duct.

[0012] In order to better realize the utility model, further, the elastic locking part includes a locking head and a spring sheet. A plurality of spring sheets are evenly distributed on the hole wall of the locking hole along the circumferential direction. A locking head is provided on the side of the spring sheet close to the locking cylinder, and the locking head is movably engaged with the slot.

[0013] In order to better implement the present invention, further, one end of the locking head extending into the slot is in a hemispherical shape.

[0014] In order to better realize the utility model, further, the piston includes a piston body slidably arranged inside the piston cylinder, and a piston rod inserted in the inner cavity of the piston body, a first pressure-bearing part is arranged at one end of the piston body, and a locking hole is arranged at the center of the first pressure-bearing part; a second pressure-bearing part is arranged at the other end of the piston body, an inner cavity is arranged inside the piston body, one end of the inner cavity is connected to the locking hole, and the other end of the inner cavity is arranged corresponding to one side end surface of the second pressure-bearing part, and a through hole for the piston rod to pass through is arranged at the center of the second pressure-bearing part.

[0015] In order to better realize the utility model, further, the outer sleeve of the piston body is provided with a piston sleeve, and the piston sleeve is connected to the piston cylinder in a sliding fit; the piston sleeve is located between the first pressure-bearing part and the second pressure-bearing part.

[0016] In order to better implement the present utility model, further, one end of the piston sleeve abuts against the end surface of the first pressure-bearing part, and the other end of the piston sleeve abuts against the end surface of the second pressure-bearing part.

[0017] In order to better realize the utility model, further, a positioning groove is provided on the cavity wall of the inner cavity of the piston body, and a clamping block axially engaged with the positioning groove is provided outside the end of the piston rod extending into the inner cavity, and an air hole is provided on the clamping block.

[0018] In order to better implement the present invention, further, an ejection connecting frame is provided at one end of the piston rod extending to the outside of the piston cylinder.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] The utility model provides a locking cylinder at one end of a piston cylinder, and a locking hole at the end of the piston, and axially clamps a plurality of elastic locking parts circumferentially arranged on the hole wall of the locking hole with the cylinder wall of the locking cylinder, thereby realizing axial locking of the piston in a non-ejection state, and effectively preventing the piston from moving in the non-ejection state; when ejection is required, high-pressure gas is input into the unlocking air inlet inside the locking cylinder, so that the elastic locking part is contracted and separated from the locking cylinder, thereby realizing axial unlocking of the piston, and then the ejection air inlet inputs high-pressure gas into the interior of the piston cylinder, and the high-pressure gas acts on the end of the piston to drive the piston to move axially quickly, and finally the piston can drive the UAV to realize rapid pneumatic ejection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the internal structure of the gas pressure ejection piston;

[0022] Figure 2 is a schematic diagram of a locking hole;

[0023] Figure 3 It is a structural schematic diagram of the piston;

[0024] Figure 4 for Figure 1 AA section view;

[0025] Figure 5 for Figure 1 A partial enlarged view of point B.

[0026] Among them: 1-piston cylinder; 2-piston; 3-locking cylinder; 4-locking hole; 5-elastic locking part; 6-unlocking air inlet; 7-ejection air inlet; 21-piston body; 22-piston sleeve; 23-piston rod; 31-slot; 51-locking head; 52-spring; 100-first pressure-bearing part; 200-second pressure-bearing part. DETAILED DESCRIPTION

[0027] The following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the utility model explicitly states otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0030] Terminology explanation section: The terms "install", "connect", "connect", "fixed" and so on in the present utility model should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0031] Embodiment 1:

[0032] A pneumatic ejection piston for a drone in this embodiment, such as Figure 1-Figure 3As shown, it includes a piston cylinder 1 and a piston 2 slidably arranged inside the piston cylinder 1, a locking cylinder 3 is arranged inside one end of the piston cylinder 1, a locking hole 4 is arranged at the end of the piston 2 close to the locking cylinder 3, the locking hole 4 is slidably sleeved on the outside of the locking cylinder 3, and an elastic locking part 5 movably engaged with the outer wall of the locking cylinder 3 is arranged on the hole wall of the locking hole 4, an unlocking air inlet 6 is arranged inside the locking cylinder 3, and the air outlet end of the unlocking air inlet 6 is arranged corresponding to the elastic locking part 5; an ejection air inlet 7 is arranged on one end of the piston cylinder 1.

[0033] A sliding cavity is provided inside the piston cylinder 1, and the piston 2 is connected to the sliding cavity in a sliding manner, so that the piston 2 can move along the axial direction of the piston cylinder 1 when subjected to pneumatic pressure. An unlocking air inlet is provided at the center of the end of the piston cylinder 1, and a plurality of ejection air inlets 7 are evenly provided around the unlocking air inlet in the circumferential direction, and the ejection air inlet 7 is connected to the sliding cavity inside the piston cylinder 1. A locking cylinder 3 is coaxially provided inside the piston cylinder 1, and an unlocking air inlet 6 is provided inside the locking cylinder 3, and the air inlet end of the unlocking air inlet 6 is connected to the unlocking air inlet, and the air outlet end of the unlocking air inlet 6 is provided corresponding to the elastic locking portion 5.

[0034] In the locked state, the elastic locking part 5 provided on the hole wall of the locking hole 4 is axially engaged with the outer wall of the locking cylinder 3 under its own elastic action, thereby realizing the axial positioning of the piston 2 and avoiding the axial loosening of the piston 2 during transportation. When the drone needs to be pneumatically ejected, the unlocking air inlet is connected to the second high-pressure gas source, and high-pressure gas is input into the unlocking air inlet 6 through the second high-pressure gas source. The high-pressure gas acts on the elastic locking part 5, causing the elastic locking part 5 to shrink and disengage from the wall of the locking cylinder 3 to unlock. At this time, the piston 2 can slide along the axis of the piston cylinder 1. Then, high-pressure gas is input into the ejection air inlet 7 through the first high-pressure gas source. The high-pressure gas enters the sliding cavity of the piston cylinder 1 and acts on the end face of the piston 2 to drive the piston 2 to move along the axis of the piston cylinder 1. Moreover, when the elastic locking portion 5 is separated from the wall of the locking cylinder 3, the high-pressure gas input from the second high-pressure gas source continues to enter the sliding cavity of the piston cylinder 1, and acts on the end face of the piston 2 together with the high-pressure gas input from the first high-pressure gas source, ensuring that the piston 2 can quickly and high-speed drive the drone for pneumatic ejection.

[0035] Furthermore, the air inlet end of the ejection air inlet duct 7 and the air inlet end of the unlocking air inlet are both provided with quick connectors, which can be conveniently connected to an external air source through the quick connectors.

[0036] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.

[0037] Embodiment 2:

[0038] A pneumatic ejection piston for a drone is improved on the basis of Example 1, such as Figure 1-Figure 3As shown, a plurality of elastic locking parts 5 are evenly distributed along the circumferential direction on the hole wall of the locking hole 4, and a plurality of card grooves 31 movably engaged with the elastic locking parts 5 are arranged on the wall of the locking cylinder 3 along the circumferential direction, and the card grooves 31 are connected to the air outlet end of the unlocking air inlet 6.

[0039] When the unlocked air inlet 6 is not inlet, the elastic locking portion 5 extends to the inside of the slot 31 under its own elastic force and is axially engaged with the slot 31, thereby axially locking the piston 2. After the unlocked air inlet 6 is inlet, high-pressure gas enters the slot 31 and acts on one end of the elastic locking portion 5, driving the elastic locking portion 5 to contract in a direction away from the slot 31 until the slot 31 is disengaged from the elastic locking portion 5, thereby pneumatically unlocking the piston 2.

[0040] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.

[0041] Embodiment 3:

[0042] A pneumatic ejection piston for a drone, improved on the basis of embodiment 1 or 2, such as Figure 5 As shown, the elastic locking portion 5 includes a locking head 51 and a spring 52. A plurality of springs 52 are evenly distributed along the circumferential direction on the hole wall of the locking hole 4. A locking head 51 is provided on one side of the spring 52 close to the locking cylinder 3. The locking head 51 is movably engaged with the slot 31.

[0043] The spring piece 52 is used to provide sufficient elastic force to the locking head 51, so that the locking head 51 can extend to the inside of the slot 31 and axially engage with the slot 31. After the air intake is unlocked and the intake passage 6 is inhaled, the high-pressure gas enters the slot 31 and acts on the end of the locking head 51, so that the spring piece 52 is compressed until the locking head 51 is disengaged from the slot 31, thereby achieving axial unlocking of the piston 2.

[0044] Furthermore, one end of the locking head 51 extending into the slot 31 is in a hemispherical shape, so as to ensure that the locking head 51 can be smoothly disengaged from the slot 31 and avoid the locking head 51 being stuck in the slot 31 .

[0045] The other parts of this embodiment are the same as those of Embodiment 1 or 2, and thus will not be described in detail.

[0046] Embodiment 4:

[0047] A pneumatic ejection piston for a drone, improved on the basis of any one of embodiments 1-3, such as Figure 3 , Figure 4As shown, the piston 2 includes a piston body 21 slidably arranged inside the piston cylinder 1, and a piston rod 23 inserted in the inner cavity of the piston body 21, a first pressure-bearing portion 100 is arranged at one end of the piston body 21, and a locking hole 4 is arranged at the center of the first pressure-bearing portion 100; a second pressure-bearing portion 200 is arranged at the other end of the piston body 21, an inner cavity is arranged inside the piston body 21, one end of the inner cavity is connected to the locking hole 4, and the other end of the inner cavity is arranged corresponding to one side end surface of the second pressure-bearing portion 200, and a through hole for the piston rod 23 to pass through is arranged at the center of the second pressure-bearing portion 200.

[0048] After the piston 2 is unlocked and the ejection air intake 7 is inhaled, the high-pressure gas first acts on the end surface of the first pressure-bearing part 100, thereby driving the piston body 21 to move along the axial direction of the piston cylinder 1. At the same time, the high-pressure gas passes through the locking hole 4 at the center of the first pressure-bearing part 100, and continues to pass through the inner cavity inside the piston body 21 before acting on the end surface of the second pressure-bearing part 200, thereby preventing the pressure difference at both ends of the piston body 21 from being too large and causing the piston to become unstable.

[0049] Furthermore, the first pressure-bearing part 100 and the second pressure-bearing part 200 are installed at two ends of the piston body 21 by welding or threaded connection.

[0050] The other parts of this embodiment are the same as any one of Embodiments 1-3, so they are not described again.

[0051] Embodiment 5:

[0052] A pneumatic ejection piston for a drone, improved on the basis of any one of embodiments 1-4, such as Figure 3 , Figure 4 As shown, the piston body 21 is externally sleeved with a piston sleeve 22 , and the piston sleeve 22 is slidably connected to the piston cylinder 1 ; the piston sleeve 22 is located between the first pressure-bearing portion 100 and the second pressure-bearing portion 200 .

[0053] By providing the piston sleeve 22, the outer wall of the piston sleeve 22 is slidably connected with the wall of the sliding cavity of the piston cylinder 1, thereby guiding the sliding of the piston body 21 axially, thereby ensuring the sliding stability of the piston body 21. At the same time, by sleeve-arranging the piston sleeve 22 on the outside of the piston body 21, the piston body 21 is prevented from directly contacting the piston cylinder 1, thereby extending the service life of the piston body 21.

[0054] Furthermore, one end of the piston sleeve 22 abuts against the end surface of the first pressure-bearing part 100, and the other end of the piston sleeve 22 abuts against the end surface of the second pressure-bearing part 200. The piston sleeve 22 is axially limited by the first pressure-bearing part 100 and the second pressure-bearing part 200 to prevent the piston sleeve 22 from axial movement and instability.

[0055] The other parts of this embodiment are the same as any one of Embodiments 1-4, so they are not described again.

[0056] Embodiment 6:

[0057] A pneumatic ejection piston for a drone, improved on the basis of any one of embodiments 1-5, such as Figure 4 As shown, a positioning groove is provided on the cavity wall of the inner cavity of the piston body 21, and a block axially engaged with the positioning groove is provided outside the end of the piston rod 23 extending into the inner cavity, and an air hole is provided on the block. The block is a fan-shaped block, and the air hole is an arc-shaped hole. The engagement between the fan-shaped block and the positioning groove limits the axial movement and circumferential rotation of the piston rod 23, thereby ensuring the stability of the ejection process driven by the piston rod 23. At the same time, setting the air hole as an arc-shaped hole can increase the ventilation flow rate, ensuring that sufficient high-pressure gas can act on the end face of the second pressure-bearing part 200 after passing through the arc-shaped hole.

[0058] Furthermore, an ejection connection frame is provided at one end of the piston rod 23 extending to the outside of the piston cylinder 1 .

[0059] The other parts of this embodiment are the same as any one of Embodiments 1-5, so they are not described again.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A pneumatic ejection piston for an unmanned aerial vehicle, comprising a piston cylinder (1) and a piston (2) slidably disposed inside the piston cylinder (1), characterized in that: A locking cylinder (3) is provided inside one end of the piston cylinder (1); a locking hole (4) is provided at one end of the piston (2) close to the locking cylinder (3); the locking hole (4) is slidably sleeved on the outside of the locking cylinder (3); an elastic locking portion (5) movably engaged with the outer wall of the locking cylinder (3) is provided on the hole wall of the locking hole (4); an unlocking air inlet (6) is provided inside the locking cylinder (3); an air outlet end of the unlocking air inlet (6) is provided corresponding to the elastic locking portion (5); and an ejection air inlet (7) is provided on one end of the piston cylinder (1).

2. The pneumatic ejection piston for a drone according to claim 1, characterized in that: A plurality of elastic locking portions (5) are evenly distributed along the circumferential direction on the hole wall of the locking hole (4), a plurality of clamping grooves (31) movably engaged with the elastic locking portions (5) are circumferentially arranged on the wall of the locking cylinder (3), and the clamping grooves (31) are connected to the air outlet end of the unlocking air inlet duct (6).

3. The pneumatic ejection piston for a drone according to claim 2, characterized in that: The elastic locking portion (5) comprises a locking head (51) and a spring sheet (52). A plurality of spring sheets (52) are evenly distributed along the circumferential direction on the hole wall of the locking hole (4). A locking head (51) is provided on one side of the spring sheet (52) close to the locking cylinder (3). The locking head (51) is movably engaged with the locking groove (31).

4. The pneumatic ejection piston for a drone according to claim 3, characterized in that: One end of the locking head (51) extending into the interior of the slot (31) is in a hemispherical shape.

5. The pneumatic ejection piston for a drone according to claim 1, characterized in that: The piston (2) comprises a piston body (21) slidably arranged inside the piston cylinder (1), and a piston rod (23) inserted into the inner cavity of the piston body (21); a first pressure-bearing portion (100) is arranged at one end of the piston body (21), and a locking hole (4) is arranged at the center of the first pressure-bearing portion (100); a second pressure-bearing portion (200) is arranged at the other end of the piston body (21), and an inner cavity is arranged inside the piston body (21), one end of the inner cavity is connected to the locking hole (4), and the other end of the inner cavity is arranged corresponding to one side end surface of the second pressure-bearing portion (200), and a through hole for the piston rod (23) to pass through is arranged at the center of the second pressure-bearing portion (200).

6. The pneumatic ejection piston for a drone according to claim 5, characterized in that: The piston body (21) is externally sleeved with a piston sleeve (22), and the piston sleeve (22) is connected to the piston cylinder (1) in a sliding manner; the piston sleeve (22) is located between the first pressure-bearing portion (100) and the second pressure-bearing portion (200).

7. The pneumatic ejection piston for a drone according to claim 6, characterized in that: One end of the piston sleeve (22) abuts against an end surface of the first pressure-bearing portion (100), and the other end of the piston sleeve (22) abuts against an end surface of the second pressure-bearing portion (200).

8. The pneumatic ejection piston for a drone according to claim 7, characterized in that: A positioning groove is provided on the cavity wall of the inner cavity of the piston body (21), and a clamping block axially engaged with the positioning groove is provided outside one end of the piston rod (23) extending into the inner cavity, and an air hole is provided on the clamping block.

9. The pneumatic ejection piston for a drone according to claim 8, characterized in that: An ejection connection frame is provided at one end of the piston rod (23) extending to the outside of the piston cylinder (1).

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