One-way damping motion isolation buffer for high impact loads

Abstract

The present invention belongs to the field of vehicle protection, and specifically relates to a one-way damping motion isolation buffer device for strong impact loads. It includes an upper connecting end cover, a lower connecting end cover, an energy conversion element and a one-way liquid damper; the upper connecting end cover and the lower connecting end cover are respectively connected to the corresponding seat mounting support points, and the energy conversion element and the one-way liquid damper are arranged between the upper connecting end cover and the lower connecting end cover; in the impact compression stage, the strong impact kinetic energy is converted into potential energy by the energy conversion element, and in the stretching stage, the potential energy is converted into internal energy for dissipation by the one-way liquid damper, thereby isolating the protected device from the strong impact motion of the support point. The present invention arranges a movable damping sheet inside the one-way damper to ensure that there is no damping effect in the compression stage, and energy is dissipated only in the stretching stage, avoiding the problem of poor energy conversion effect caused by excessive instantaneous stiffness due to the damper reaction hysteresis in the impact compression stage.

Description

Technical Field

[0001] The invention belongs to the field of vehicle protection, and in particular relates to a unidirectional damping motion isolation buffer device for strong impact loads. Background Art

[0002] Structural devices such as military vehicle seats are often subjected to strong impact loads such as explosions during operation. The protective structures currently developed for harsh working conditions mainly include energy-absorbing foot pads, seat buffer partition devices, etc., which to a certain extent reduce the occupants' tibia force and lumbar dynamic response index and other indicators.

[0003] The above structures mostly rely on plastic deformation for energy absorption and buffering. After one impact, the structure basically fails and cannot cope with multiple loadings under harsh working conditions in a changing battlefield environment. It is necessary to develop an energy absorption and buffering device with multiple protection capabilities. The one-way damping motion isolation buffer device in the present invention dissipates impact kinetic energy through elastic energy conversion elements and one-way dampers, and has secondary and multiple impact protection capabilities. Summary of the invention

[0004] The object of the present invention is to provide a unidirectional damping motion isolation buffer device for strong impact loads.

[0005] The technical solution to achieve the purpose of the present invention is: a one-way damping motion isolation buffer device for strong impact loads, comprising an upper connecting end cover, a lower connecting end cover, an energy conversion element and a one-way liquid damper;

[0006] The upper connecting end cover and the lower connecting end cover are respectively connected to the corresponding seat mounting support points, and the energy conversion element and the one-way liquid damper are arranged between the upper connecting end cover and the lower connecting end cover; in the impact compression stage, the strong impact kinetic energy is converted into potential energy by the energy conversion element, and in the tension stage, the potential energy is converted into internal energy for dissipation by the one-way liquid damper, thereby isolating the protected device from the strong impact movement of the support point.

[0007] Furthermore, the energy conversion elements are in two groups and are symmetrically arranged on both sides of the one-way liquid damper.

[0008] Furthermore, the energy conversion element is a spring or an energy-absorbing metal sheet, and the shape of the metal sheet is E-shaped, C-shaped or S-shaped.

[0009] Further, the one-way liquid damper includes a movable plate, a damping chamber, an upper end cover of the damping chamber, a lower end cover of the damping chamber, a pre-compression spring connecting plate, a pre-compression spring, a movable damping plate, a movable damping plate locking pin, a movable damping plate release pin and a movable damping plate connecting plate, and the movable damping plate is provided with a damping hole;

[0010] The upper end cover of the damping chamber is provided with a hole for the moving plate to pass through, the lower end cover of the damping chamber is provided with a movable damping plate release pin, and the lower surface of the lower end cover of the damping chamber is connected to the lower connecting end cover through a vertical plate;

[0011] The lower end of the movable sheet is inserted into the damping cavity, and a portion of the sheet body is extended to both sides of the lower end. The middle of the extended sheet body is hollowed out for the release pin of the movable damping sheet to pass through. The hollow part ensures that the extended sheet body will not cause a damping effect during the compression stage.

[0012] The extended sheet body is rotatably connected to the movable damping sheet. In the non-working state and the compression stage, the movable damping sheet is perpendicular to the extended sheet body at the lower end of the movable sheet and parallel to the main body of the movable sheet.

[0013] The pre-compression spring connecting piece is L-shaped as a whole, fixedly connected to both sides of the lower part of the moving piece, and located on the upper part of the extended piece body, with a gap left in the vertical direction between the two; one end of the pre-compression spring is fixedly connected to the pre-compression spring connecting piece;

[0014] The movable damping plate connecting piece is L-shaped, fixedly connected to the movable damping plate, and located above the pre-compression spring connecting piece;

[0015] In the non-working state and the compression stage, the movable damping plate locking pin connects the movable damping plate connecting plate and the pre-compression spring connecting plate; at the end of the compression stroke, the movable damping plate releasing pin pushes out the movable damping plate locking pin, so that the movable damping plate connecting plate is disconnected from the pre-compression spring connecting plate, and the movable damping plate is quickly turned from a vertical position to a horizontal position through the pre-compression spring.

[0016] Furthermore, the movable damping plate locking pin has a square cross-section, the cross-sectional area of ​​the upper end is larger than that of the lower end, the lower end is used to connect the movable damping plate connecting plate and the pre-compression spring connecting plate, and the upper end is used to prevent the lower end from vertically sliding down along the pin hole;

[0017] The cross section of the movable damping plate release pin is circular, and the horizontal plate of the pre-compression spring connecting piece is provided with a liquid flow hole and a pin hole matching the shape of the movable damping plate release pin and the movable damping plate locking pin.

[0018] Furthermore, the outwardly extending sheet body is connected to the movable damping sheet via a movable hinge.

[0019] Furthermore, the protruding sheet body at the lower end of the movable sheet and the movable connection part of the movable damping sheet are in a mutually matching L-shape, ensuring that the movable damping sheet can only be parallel to the protruding sheet body at the lower end of the movable sheet when pressed downward by the upper liquid in the damping chamber during the stretching stage, that is, it enters a stretching locking state under the action of the damping liquid.

[0020] Furthermore, the damping hole is a thin-walled small hole, and the ratio of the hole length to the hole diameter is less than 0.5.

[0021] Furthermore, a square connection block with a hole is provided on the top of the upper connection end cover, which is connected to the seat mounting support point.

[0022] The upper connecting end cover is provided with threaded holes and grooves, and bolts are used to fix the energy conversion element and the upper end of the one-way liquid damper in the grooves through the threaded holes;

[0023] The two grooves of the upper connecting end cover matching the upper end of the energy conversion element are longitudinally connected, and the groove matching the upper end of the one-way liquid damper is perpendicular to the above two grooves and does not pass through.

[0024] Furthermore, the lower connecting end cover is provided with a threaded hole, and a groove is provided inside, and the energy conversion element and the lower end of the one-way damper are fixed in the groove of the lower connecting end cover by bolts through the threaded hole;

[0025] The grooves matching the lower connecting end cap, the energy conversion element and the lower end of the one-way liquid damper are all longitudinally connected;

[0026] A square connection block with a hole is provided at the bottom of the lower connection end cover and is connected to the seat installation support point.

[0027] Compared with the prior art, the present invention has the following significant advantages:

[0028] (1) The present invention converts the rigid connection between the seat and the mounting support point into a flexible connection. In the compression stage of a strong impact such as an explosion, the impact kinetic energy can be converted into the elastic compression potential energy of the elastic energy conversion element. After the compression ends and enters the stretching stage, the compression potential energy is converted into internal energy for dissipation through a one-way damper, thereby reducing the magnitude of the impact acceleration transmitted to the protected structure, isolating the protected structure such as the seat from the impact motion in terms of motion parameters, and greatly improving the occupant protection performance of military vehicles;

[0029] (2) The present invention generates damping effect only when the compression ends and the stretching stroke begins through the one-way damper, thus avoiding the problem of poor energy conversion effect caused by the instantaneous stiffness increase due to the instantaneous damping hysteresis effect of the impact action;

[0030] (3) The present invention dissipates energy through a one-way damper, which can quickly reduce the impact kinetic energy and avoid the problem of reduced passenger comfort caused by high-frequency oscillation of the energy conversion element;

[0031] (4) When the one-way damper of the present invention encounters a secondary impact, the damping liquid drives the movable damping plate to move freely. When compressed, the damping liquid causes the movable damping plate to be in a nearly vertical state. When stretched, the damping liquid causes the movable damping plate to be in a stretched locked state. Compared with energy absorption devices such as the collapse type, the one-way damper and the energy conversion element together enable the present device to have secondary and multiple impact protection capabilities;

[0032] (5) Changing the stiffness of the energy conversion element 3 can control the loading force required to make the energy conversion element reach the compression elastic limit, thereby making the device suitable for different impact load loading conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is an overall schematic diagram of the present invention.

[0034] Figure 2 It is an exploded diagram of the overall system of the present invention.

[0035] Figure 3 This is a diagram of the internal structure of the one-way damper of the present invention when it is not in action.

[0036] Figure 4 This is a diagram of the internal structure of the one-way damper of the present invention after it is activated.

[0037] Description of reference numerals:

[0038] 1-upper connecting end cover, 2-connecting end cover fixing bolt, 3-energy conversion element, 4-moving plate, 5-damping chamber, 6-lower connecting end cover, 7-connecting end cover fixing nut, 8-damping chamber upper end cover, 9-damping chamber lower end cover, 10-pre-compression spring connecting plate, 11-pre-compression spring, 12-movable damping plate, 13-movable damping plate locking pin, 14-movable hinge, 15-movable damping plate release pin, 16-damping hole, 17-movable damping plate connecting plate. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0040] like Figure 1 As shown, a one-way damping motion isolation buffer device for strong impact loads includes upper and lower connecting end covers 1, 6, connecting end cover fixing bolts and nuts 2, 7, energy conversion element 3, one-way damper and other parts;

[0041] The upper connecting end cover 1 is provided with a threaded hole and a groove inside, which cooperates with the spatial position of the upper end of the energy conversion element 3 and the one-way damper. The upper end of the energy conversion element 3 and the one-way damper are fixed in the groove of the upper connecting end cover through the connecting end cover fixing bolts and nuts 2 and 7 through the threaded holes;

[0042] The strong impact input is transmitted to the upper and lower ends of the energy conversion element 3 and the one-way damper through the upper and lower connecting end covers 1 and 6, causing the energy conversion element 3 and the one-way damper to begin to compress. In this process, the energy conversion element 3 converts the strong impact kinetic energy into its own compression potential energy. When it reaches the compression limit and enters the stretching stage, the potential energy is converted into liquid internal energy and dissipated through the one-way damper, thereby isolating the seats and other protected devices from the strong impact movement to reduce the occupant response. Since the input time of strong impacts such as explosions is in the millimeter level, in order to avoid the one-way damper's reaction hysteresis and excessive instantaneous stiffness during the impact compression stage, resulting in poor energy conversion effect, a movable damping sheet 12 is set inside the one-way damper to ensure that there is no damping effect in the compression stage, and damping energy dissipation is only performed in the stretching stage.

[0043] like Figure 2 As shown, the two grooves of the upper connecting end cover 1 that match the upper end of the energy conversion element 3 are longitudinally connected, and the groove that matches the upper end of the one-way damper is perpendicular to the above two grooves and does not pass through;

[0044] like Figure 2 As shown, the grooves matching the upper connecting end cover 1, the energy conversion element 3 and the one-way damper are perpendicular to each other. In order to avoid vertical interference of the connecting end cover fixing bolts 2, the groove matching the upper end of the one-way damper is deeper, and the corresponding threaded hole is also arranged upward;

[0045] like Figure 1 As shown, a square connection block with a hole is provided on the top of the upper connection end cover 1, which is connected to the seat mounting support point;

[0046] like Figure 1 As shown, the lower connecting end cover 6 is provided with a threaded hole and a groove inside, which cooperates with the spatial position of the lower end of the energy conversion element 3 and the one-way damper, and the lower end of the energy conversion element 3 and the one-way damper is fixed in the groove of the lower connecting end cover through the connecting end cover fixing bolts and nuts 2 and 7 through the threaded holes;

[0047] like Figure 2 As shown, the grooves matching the lower connecting end cover 6 and the lower end of the energy conversion element 3 and the one-way damper are all longitudinally connected;

[0048] like Figure 1 As shown, a square connection block with a hole is provided at the bottom of the lower connection end cover 6, which is connected to the seat mounting support point;

[0049] like Figure 1 As shown, both upper and lower ends of the energy conversion element 3 are provided with threaded holes to match the connecting end cover fixing bolts and nuts 2 and 7;

[0050] like Figure 1As shown, the energy conversion element 3 is made of a spring structure or a high elastic spring steel material such as 60Si2CrVA to form a deformable energy-absorbing arc structure, which converts the impact kinetic energy into bending potential energy when compressed and releases the potential energy in the stretching release stage. In this embodiment, it is a high elastic spring steel arc structure;

[0051] like Figure 1 As shown, a pair of energy conversion elements 3 are provided, which are symmetrically arranged along the one-way damper;

[0052] The shape of the energy conversion element is not limited to the E-type, but can also be a C-type, S-type or other energy-absorbing shape;

[0053] like Figure 2 As shown, the one-way damper is composed of a movable plate 4, a damping chamber 5, an upper end cover 8 of the damping chamber, a lower end cover 9 of the damping chamber, a movable damping plate 12, a movable hinge 14, a movable damping plate release pin 15, a movable damping plate locking pin 13, a pre-compression spring 11, a movable damping plate connecting plate 17, a pre-compression spring connecting plate 10, a damping hole 16 and the like;

[0054] The damping hole 16 is defined as a thin-walled small hole, and the ratio of the hole length to the hole diameter is less than 0.5, that is, the size of the damping hole depends on the movable damping plate 12, and movable damping plates 12 of different thicknesses are suitable for damping holes 16 of corresponding sizes.

[0055] like Figure 2 As shown, the damping chamber 5, the damping chamber upper end cover 8, and the damping chamber lower end cover 9 are connected as a whole by welding or other connecting means to form a damping liquid containing chamber;

[0056] like Figure 2 As shown, the upper end cover 8 of the damping chamber is provided with a rectangular groove, the size and orientation of which match the movable sheet 4, so as to allow the movable sheet 4 to move up and down and position;

[0057] like Figure 3 As shown, the lower end of the movable sheet 4 is deeply inserted into the damping cavity 5, and a portion of the sheet body is extended to both sides at the lower end thereof. The middle of the sheet body is hollowed out for the movable damping sheet release pin 15 to pass through. At the same time, the hollow portion can ensure that the portion of the extended sheet body will not cause a damping effect during the compression stage;

[0058] like Figure 3 As shown, the outwardly extending sheet body at the lower end of the movable sheet 4 is movably connected to the movable damping sheet 12 through a hinge. In the non-working state and the compression stage, the movable damping sheet 12 is perpendicular to the outwardly extending sheet body at the lower end of the movable sheet 4 and parallel to the main body of the movable sheet;

[0059] like Figure 3As shown, the extended sheet body at the lower end of the movable sheet 4 and the movable connection part of the movable damping sheet 12 are in an L-shape that cooperates with each other, ensuring that the movable damping sheet 12 can only be parallel to the extended sheet body at the lower end of the movable sheet 4 when being pressed down by the upper liquid of the damping chamber 5 in the stretching stage, that is, it enters a stretching locking state under the action of the damping liquid;

[0060] like Figure 3 As shown, the pre-compression spring connecting piece 10 is fixedly connected to both sides of the lower part of the moving piece 4, and is located on the upper part of the protruding piece body at the lower end of the moving piece 4, and a certain gap is left in the vertical direction between the two;

[0061] like Figure 2 As shown, the pre-compression spring connecting piece 10 fixes one end of the pre-compression spring 11 to one side of the moving piece 4;

[0062] like Figure 3 As shown, the pre-compression spring connecting piece 10 is provided with a liquid flow hole and a pin hole matching the shape of the movable damping plate release pin 15 and the movable damping plate locking pin 13;

[0063] like Figure 2 As shown, the movable damping plate locking pin 13 has a square cross-section, the cross-sectional area of ​​the upper end is larger than that of the lower end, the lower end is used to connect the movable damping plate connecting piece 17 and the pre-compression spring connecting piece 10, and the upper end is used to prevent the lower end from sliding vertically along the pin hole;

[0064] like Figure 2 As shown, the movable damping plate connecting piece 17 is fixedly connected to the movable damping plate 12, located above the pre-compression spring connecting piece 10, and has a pin hole matching the shape of the movable damping plate locking pin 13, the pin hole overlaps with the pin hole of the pre-compression spring connecting piece 10 in the vertical direction, and does not have a pin hole matching the movable damping plate release pin 15;

[0065] like Figure 3 As shown, the movable damping plate release pin 15 has a circular cross section. Since a matching pin hole is only provided on the pre-compression spring connecting piece 10, but not on the movable damping plate connecting piece 17, and the pre-compression spring connecting piece 10 is located below the movable damping plate connecting piece 17 in terms of spatial position, at the end of the compression stroke, the movable damping plate release pin 15 can push out the movable damping plate locking pin 13 through the circular pin hole on the pre-compression spring connecting piece 10, so that the movable damping plate connecting piece 17 is disconnected from the pre-compression spring connecting piece 10, and the movable damping plate 12 is quickly turned from a vertical position to a horizontal position through the pre-compression spring, and the movable damping plate release pin 15 is prevented from excessively moving into the pin hole of the movable damping plate connecting piece 17 to cause re-locking;

[0066] like Figure 3As shown, the movable damping sheet 17 plays a damping role in the stretching stroke through the damping hole 16 opened in the middle thereof, dissipating the compression potential energy of the energy conversion element 3;

[0067] The above-mentioned movable damping plate 12, movable hinge 14, movable damping plate release pin 15, movable damping plate locking pin 13, pre-compression spring 11, movable damping plate connecting plate 17, pre-compression spring connecting plate 10, damping hole 16 and other parts are symmetrically arranged along both sides of the movable plate 4;

[0068] After the movable damping sheets 12 on both sides are extended to the horizontal position, they isolate the damping chamber 5 in the horizontal direction together with the outwardly extending sheet body at the lower end of the movable sheet 4 to divide it into two parts, the damping liquid can only flow through the damping hole 16 .

Claims

1. A one-way damping motion isolation buffer device for strong impact loads, characterized in that: It comprises an upper connecting end cover (1), a lower connecting end cover (6), an energy conversion element (3) and a one-way liquid damper; The upper connecting end cover (1) and the lower connecting end cover (6) are respectively connected to corresponding seat mounting support points, and the energy conversion element (3) and the one-way liquid damper are arranged between the upper connecting end cover (1) and the lower connecting end cover (6); in the impact compression stage, the strong impact kinetic energy is converted into potential energy by the energy conversion element (3), and in the extension stage, the potential energy is converted into internal energy for dissipation by the one-way liquid damper, thereby isolating the strong impact movement of the protected device and the support point; The energy conversion elements (3) are in two groups and are symmetrically arranged on both sides of the one-way liquid damper; The energy conversion element (3) is a spring or an energy absorbing metal sheet, and the shape of the metal sheet is E-shaped, C-shaped or S-shaped; The one-way liquid damper comprises a movable plate (4), a damping chamber (5), an upper end cover (8) of the damping chamber, a lower end cover (9) of the damping chamber, a pre-compression spring connecting plate (10), a pre-compression spring (11), a movable damping plate (12), a movable damping plate locking pin (13), a movable damping plate releasing pin (15) and a movable damping plate connecting plate (17); the movable damping plate (12) is provided with a damping hole (16); The damping chamber upper end cover (8) is provided with a hole for the movable plate (4) to pass through, the damping chamber lower end cover (9) is provided with a movable damping plate release pin (15), and the lower surface of the damping chamber lower end cover (9) is connected to the lower connecting end cover (6) via a vertical plate; The lower end of the movable sheet (4) is inserted deep into the damping cavity (5), and a portion of the sheet body is extended to both sides of the lower end. The middle of the extended sheet body is hollowed out for the release pin (15) of the movable damping sheet to pass through. The hollow part ensures that the extended sheet body will not cause a damping effect during the compression stage. The extended sheet body is rotatably connected to the movable damping sheet (12). In the non-working state and the compression stage, the movable damping sheet (12) and the extended sheet body at the lower end of the movable sheet (4) are in a vertical state and in a parallel state with the movable sheet body. The pre-compression spring connecting piece (10) is L-shaped as a whole, fixedly connected to both sides of the lower part of the moving piece (4), and located on the upper part of the extended piece body, with a gap between the two in the vertical direction; one end of the pre-compression spring (11) is fixedly connected to the pre-compression spring connecting piece (10); The movable damping plate connecting plate (17) is L-shaped, fixedly connected to the movable damping plate (12), and located above the pre-compression spring connecting plate (10); In the non-working state and the compression stage, the movable damping plate locking pin (13) connects the movable damping plate connecting plate (17) and the pre-compression spring connecting plate (10); at the end of the compression stroke, the movable damping plate releasing pin (15) pushes out the movable damping plate locking pin (13), so that the movable damping plate connecting plate (17) is disconnected from the pre-compression spring connecting plate (10), and the movable damping plate (12) is quickly turned from a vertical position to a horizontal position through the pre-compression spring.

2. The buffer device according to claim 1, characterized in that: The movable damping plate locking pin (13) has a square cross section, the cross-sectional area of ​​the upper end portion is larger than that of the lower end portion, the lower end portion is used to connect the movable damping plate connecting piece (17) and the pre-compression spring connecting piece (10), and the upper end portion is used to prevent the lower end portion from vertically sliding down along the pin hole; The cross section of the movable damping plate release pin (15) is circular, and the horizontal plate of the pre-compression spring connecting plate (10) is provided with a liquid flow hole and a pin hole matching the shape of the movable damping plate release pin (15) and the movable damping plate locking pin (13).

3. The buffer device according to claim 2, characterized in that: The extended sheet body is connected to the movable damping sheet (12) via a movable hinge (14).

4. The buffer device according to claim 3, characterized in that: The protruding sheet body at the lower end of the movable sheet (4) and the movable connection portion of the movable damping sheet (12) are in an L-shape that cooperates with each other, ensuring that the movable damping sheet (12) can only be in a parallel state with the protruding sheet body at the lower end of the movable sheet (4) when pressed downward by the upper liquid of the damping chamber (5) during the stretching stage, that is, it enters a stretching locking state under the action of the damping liquid.

5. The buffer device according to claim 4, characterized in that: The damping hole (16) is a thin-walled small hole, and the ratio of the hole length to the hole diameter is less than 0.5.

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