A spinning friction type vehicle lightning protection seat mounting energy absorption device

Abstract

The present application belongs to the field of vehicle protection, and particularly relates to a spinning friction type vehicle lightning protection seat installation energy absorption device. The device is arranged between a seat and a bottom of a vehicle, and comprises a connecting guide mechanism, a spinning mechanism and a composite multi-field coupling energy absorption mechanism. The connecting guide mechanism is used to realize connection of the seat and the energy absorption buffer device, and to decouple the seat from the vehicle body and guide movement of the seat when an impact occurs. The spinning mechanism is used to generate a spinning compression movement when an impact occurs and to connect the vehicle body, so as to convert an axial impact into a spiral movement. When the vehicle is impacted, the composite multi-field coupling energy absorption mechanism realizes buffering and energy absorption of the impact through multi-physical field cooperation of torsion-compression coupling plastic deformation, compression plastic deformation and friction-viscous damping coupling. The present application provides an energy absorption device with compact structure, high efficiency and high stability, which can greatly reduce impact on passengers during explosion and reduce injury risk of passengers.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of vehicle protection, and particularly relates to a spinning friction type vehicle mine-proof seat installation energy absorption device. BACKGROUND

[0002] In the current vehicle explosion protection technology, the bottom energy absorption structure and shock wave offset technology significantly reduce the great damage caused by mines and improvised explosive devices, but the explosive load induced vehicle body acceleration response and subsequent dynamic impact process are still the main factors leading to casualties in the vehicle. Under this background, the innovative design of the mine-proof seat is the core technical means to improve the survival ability of passengers. The design of the vehicle mine-proof seat can effectively attenuate the transmission of impact energy when the vehicle is subjected to bottom explosion impact, limit the impact peak value and duration of the personnel within the safety threshold, and thus realize the precise protection of the key parts of the human body.

[0003] For the design of the mine-proof seat, different forms of mine-proof seats have been developed abroad, such as the XYZVR series of magneto-rheological fluid buffer mine-proof seats of the GSS company in the United States, the spring-rubber composite buffer explosion-proof seat of the Creation company in the United Kingdom, and the Autoflug dynamic suspension seat. The research on mine-proof seats in China started late, and most of them are concentrated on the seat itself, which limits the shock wave buffer energy absorption and cannot better protect the personnel. SUMMARY

[0004] The purpose of the present application is to provide a spinning friction type vehicle mine-proof seat installation energy absorption and buffer device. The purpose of the present application is to buffer and absorb the impact of the vehicle body to the mine-proof seat during explosion, reduce the damage of the vehicle body to the passengers during explosion, and through the cooperative operation of the rotating compression energy absorption mechanism and the friction buffer mechanism, provide a compact structure with high efficiency and high stability energy absorption scheme, which can effectively absorb the impact energy of the vehicle body to the seat, greatly reduce the impact on the passengers during explosion, and reduce the risk of passenger injury.

[0005] The technical solution for achieving the purpose of the present application is a spinning friction type vehicle mine-proof seat installation energy absorption device, which is arranged between the seat and the bottom of the vehicle, and comprises:

[0006] A connecting and guiding mechanism is used to realize the connection of the seat and the energy absorption and buffer device, and to decouple the seat from the vehicle body during impact and guide the movement of the seat;

[0007] A spinning mechanism is used to produce rotating compression movement when impacted and connected to the vehicle body, converting the axial impact into spiral movement;

[0008] The composite multi-field coupling energy absorption mechanism: when the vehicle is impacted, the impact is buffered and absorbed through the torsion-compression coupled plastic deformation, compression plastic deformation and friction-viscous damping coupled multi-physical field cooperation.

[0009] Further, the connecting and guiding mechanism comprises a seat roof beam, two semicircular ring rubber blocks and two semicircular shell-shaped open flanges.

[0010] The bottom of the seat roof beam is provided with a circular shear disc connected with the semicircular shell-shaped open flanges, and annular baffles I and annular baffles II are arranged on the inner circumferences of the two semicircular shell-shaped open flanges, and the annular baffles II are provided with annular grooves matched with the circular shear disc.

[0011] During assembly, the circular shear disc of the seat roof beam is inserted into the annular groove in the annular baffle II below the semicircular shell-shaped open flange, the two semicircular ring rubber blocks are arranged between the annular baffles I and annular baffles II of the two semicircular shell-shaped open flanges, and the two semicircular shell-shaped open flanges are connected through the side rectangular flanges and press the two semicircular ring rubber blocks to the outer circumference of the seat roof beam to achieve the clamping of the lightning protection seat roof beam; the semicircular flange below the semicircular shell-shaped open flange is connected with the spinning mechanism.

[0012] Further, a segmented annular reduction groove is arranged on the circular shear disc of the seat roof beam, and the starting force of the energy absorption device is adjusted by changing the thickness of the circular shear disc and the layout and size of the segmented annular reduction groove.

[0013] The material of the two semicircular shell-shaped open flanges is steel, and the two sides of the annular baffle II at the lower part of the inner circumference of the two semicircular shell-shaped open flanges are provided with reinforcing ribs abutting against the inner walls of the two semicircular shell-shaped open flanges.

[0014] The side rectangular flanges of the two semicircular shell-shaped open flanges are connected through bolts.

[0015] Further, the spinning mechanism comprises a rotating pressure head, a rotating guide pipe, a thrust bearing and a bearing cover.

[0016] The rotating guide pipe is in the shape of a cylinder with a closed bottom, the rotating guide pipe is provided with circular flanges at the upper and lower ends, the inner wall of the rotating guide pipe is provided with a spiral downward guide groove, and the bottom is provided with annular arrays of limit blocks I and limit blocks II to limit the rotation of the energy absorption mechanism; the rotating guide pipe is connected with the semicircular shell-shaped open flange through the upper end circular flange, and the rotating guide pipe is connected with the bottom of the vehicle below the seat through the lower end circular flange.

[0017] The rotating pressure head is a stepped circular ring structure of an outer peripheral annular array of helical sliders; the helical sliders of the annular array are matched with helical guide grooves of the rotating guide tube to form a moving pair; an annular groove for mounting a thrust bearing and a bearing cover is formed on the upper side of the rotating pressure head, and a hollow ring is formed on the lower side of the rotating pressure head, and a ring groove with a U-shaped cross section is formed on the inner bottom surface of the hollow ring and matched with an energy absorbing mechanism;

[0018] The rotating pressure head is matched with the helical guide grooves in the rotating guide tube through the helical sliders, so that the helical downward movement is generated when the rotating pressure head is impacted, and the axial impact is converted into the helical movement.

[0019] Further, the rotating guide tube is made of steel, has a total length L3, and has N3 helical guide grooves with a helical axis being an axis of the rotating guide tube, a starting point being on an inner circle of an upper end surface of the rotating guide tube, a pitch being P1, and a height being H2; the cross section of the guide groove perpendicular to the helical line is a square cross section with a side length S1, and H2 < L3 and P1 = 2*H2.

[0020] The bottom plate of the rotating guide tube is uniformly distributed with N4 limiting blocks I and N5 limiting blocks II in the circumferential direction; the limiting block I is a concave shape, is back to the inner wall of the rotating guide tube, and has a height h1; the limiting block II is a single circular arc quadrilateral, the circular arc is concentric with the inner circle of the bottom of the rotating guide tube, the diameter of the circle on which the circular arc is located is D3, and the height of the limiting block II is h2.

[0021] The rotating guide tube and the rotating pressure head adjust the dominant form of energy absorption in the working process of the energy absorbing mechanism by changing the pitch angle of the helical line.

[0022] Further, the rotating pressure head is made of alloy steel, and the inner bottom surface of the hollow ring is provided with a circular ring-shaped welded positioning block.

[0023] The helical sliders of the annular array of the rotating pressure head are flush with the lower end surface of the rotating pressure head;

[0024] The thrust bearing is below, the bearing cover is above, and they are sequentially installed in the annular groove on the upper side of the rotating pressure head; the helical sliders of the rotating pressure head are matched with the helical guide grooves of the rotating guide tube to install the entire spinning mechanism together.

[0025] Further, the composite multi-field coupling energy absorbing mechanism includes an axial compression tube, a rotating compression tube, and an I-shaped rubber strip.

[0026] The axial compression tube is matched with the U-shaped groove of the rotating pressure head through the U-shaped flange on the upper end;

[0027] The outer periphery of the bottom of the axial compression tube is provided with a plurality of rectangular limiting blocks III matched with the limiting blocks I of the rotating guide tube;

[0028] The inner diameter of the rotary compression tube is the same as the arc diameter of the limiting block II in the rotary guide tube. Multiple semi-I-shaped slots are evenly distributed around the outside. The bottom inner circumference of the rotary compression tube is provided with protruding teeth that match the limiting block II of the rotary guide tube. The protruding teeth are in the shape of an inclined quadrilateral, and the inclination direction is the same as the rotation direction of the spiral guide groove in the rotary guide tube.

[0029] The rectangular limiting block III of the axial compression tube and the protruding teeth of the rotary compression tube cooperate with the limiting block at the bottom of the rotary guide tube to restrict the rotation of the energy absorption mechanism;

[0030] The rotary compression tube has multiple semi-I-shaped slots arranged in a ring on the outside. One side of the I-shaped rubber strip is inserted into the slots, while the other side is tightly attached to the inner wall of the axial compression tube.

[0031] Furthermore, the seat top and bottom beams, semi-circular shell-shaped open flange, axial compression tube, rotary guide tube, rotary compression tube and rotary pressure head are coaxially arranged;

[0032] The axial compression tube is made of aluminum alloy and is a double-layered hollow tube with closed ends.

[0033] The thickness of the semi-I-shaped groove of the rotary compression tube is the same as the wall thickness of the rotary compression tube. The contact surface of the limiting block II in the rotary guide tube is completely parallel to the contact surface of the protrusion in the rotary compression tube, and the height of the protrusion is less than the height of the limiting block II in the rotary guide tube.

[0034] The I-shaped rubber strip and the rotary compression tube are of equal length.

[0035] Furthermore, the energy absorption power of the energy absorption device can be adjusted by changing the material, thickness, width, and arrangement of the semi-circular rubber block, axial compression tube, rotary compression tube, and I-shaped rubber strip.

[0036] The axial compression tube and the rotary compression tube are made of polypropylene (PP) synthetic resin.

[0037] The method for absorbing energy using the above-mentioned energy-absorbing device includes the following steps:

[0038] Under the high-speed impact of the explosion, the vehicle's underbody was subjected to high-speed impact that was transmitted to the rotating guide tube, the semi-circular shell-shaped open flange, and the lightning protection seat top and bottom beams.

[0039] When the impact force reaches the starting force of the circular shearing disc that cuts the seat's top and bottom beams, the seat decouples from the vehicle body and begins the first step of energy absorption, activating the energy absorption device.

[0040] The seat top and bottom beams move downward relative to the vehicle body, and the semi-circular rubber blocks that hold the seat top and bottom beams rub against them, continuously absorbing energy and damping shocks throughout the entire working stroke of the energy absorption device;

[0041] The seat roof beam moves downward and hits the bearing cover, and the impact is transmitted to the rotating pressure head through the bearing cover and the thrust bearing, and the rotating pressure head starts to produce spiral downward movement along the spiral guide groove of the rotating guide tube under the impact force, drives the axial compression tube to produce plastic deformation, and drives the rotating compression tube to produce torsion and plastic deformation, and the relative movement between the rotating compression tube and the axial compression tube makes the I-shaped rubber strip twist and rub.

[0042] Compared with the prior art, the present application has the following advantages:

[0043] The spinning mechanism provided by the present application innovatively adopts a nonlinear dynamics conversion mechanism, converts the axial impact load into spiral movement of the rotating pressure head through the designed spiral guide structure, and drives the energy absorption mechanism to rotate and compress; this unique movement conversion mode effectively prolongs the action time of impact energy, and a new energy distribution model is constructed based on the principle of conservation of momentum, which reduces the peak impact force of the system and realizes the spatial and temporal gradient distribution of impact energy.

[0044] The energy absorption mechanism provided by the present application innovatively adopts a composite multi-field coupling energy absorption mechanism, and the energy is dissipated based on the three-dimensional space torsion-compression coupling plastic deformation of the rotating compression tube, the compression plastic deformation of the axial compression tube, the torsion of the I-shaped polyurethane rubber strip on the surface array of the rotating compression tube, and the friction-viscous damping coupling energy dissipation between the rubber strip and the inner wall of the axial compression tube; through the synergistic effect of multiple physical fields, the energy absorption rate in a limited space is maximized.

[0045] The energy absorption mechanism provided by the present application reduces the dependence of the structure on linear space through the combination of torsion and axial compression, realizes more efficient energy absorption in a limited space, and has more advantages in space-sensitive application scenarios.

[0046] The connecting guide mechanism provided by the present application integrates connection, guidance, buffering and energy absorption, and combines rubber buffering and shear fracture decoupling mechanisms: the first impact is weakened through shear disc fracture, and then the polyurethane rubber is compressed to continuously dissipate energy through friction and damping, realizing a double energy absorption mechanism.

[0047] The compressed polyurethane rubber in the connecting guide mechanism uses viscoelastic damping energy absorption mechanism to realize continuous energy dissipation during the whole impact process, has a high energy absorption range and stable energy absorption effect; and the nonlinear viscoelastic behavior of the rubber material realizes effective attenuation of high-frequency impact.

[0048] The connecting guide mechanism provided by the present application can adapt to the protection and buffering requirements under different impacts by replacing different energy-absorbing semicircular polyurethane rubbers to adjust the friction and damping acting on the seat roof beam, and improves the multi-working-condition adaptability.

[0049] The spinning friction energy absorption device provided by this invention can achieve reuse while ensuring the safety of occupants under low-intensity impacts by changing the material of the parts in the energy absorption mechanism, for example, by replacing them with compressible raw materials such as polypropylene (PP) synthetic resin. Attached Figure Description

[0050] Fig. 1 This is a schematic diagram of the spinning friction energy absorption device of the present invention.

[0051] Fig. 2 This is an exploded view of the spinning friction energy absorption device of the present invention.

[0052] Fig. 3 This is a cross-sectional view of the spinning friction energy absorption device of the present invention.

[0053] Fig. 4 This is a schematic diagram of the rotating pressure head of the spinning mechanism of the present invention.

[0054] Fig. 5 This is a schematic diagram of the rotating guide tube of the spinning mechanism of the present invention.

[0055] Fig. 6 This is a schematic diagram of the rotating compression tube of the energy absorption mechanism of the present invention.

[0056] Fig. 7 This is a cross-sectional view of the rotary compression cylinder and energy absorption mechanism of the present invention.

[0057] Explanation of reference numerals in the attached figures:

[0058] 1- Seat top and bottom beams, 2- Semicircular ring rubber block, 3- Semicircular shell-shaped open flange, 4- I-shaped rubber strip, 5- Axial compression tube, 6- Rotary guide tube, 7- Rotary compression tube, 8- Rotary pressure head, 9- Thrust bearing, 10- Bearing cover. Detailed Implementation

[0059] The present invention will now be described in further detail with reference to the accompanying drawings.

[0060] like Figs. 1-7 As shown, a spinning friction type vehicle lightning protection seat installation energy absorption device includes a seat top and bottom beam 1, two semi-circular rubber blocks 2, two semi-circular shell-shaped open flanges 3, multiple I-shaped rubber strips 4, an axial compression tube 5, a rotating guide tube 6, a rotating compression tube 7, a rotating pressure head 8, a thrust bearing 9, a bearing cover 10, and bolts for connection.

[0061] The seat top and bottom beam 1 has a diameter of D1 and a circular shearing disc with a diameter of D2 at its end. The disc has N1 segmented annular cutting grooves.

[0062] The semi-circular shell opening flange 3 is made of 45 steel, with an inner wall diameter D3, a semi-circular ring flange below, and N2 bolt holes. Rectangular flanges are arranged on both sides of the semi-circular shell opening. An annular baffle I is arranged on the upper end surface of the semi-circular shell opening flange 3, facing downward by L1. An annular baffle II is arranged downward by L2. The annular baffle II is symmetrically opened to a rectangular cross-section annular groove along the thickness center surface. The outer circle radius of the annular groove is R1, and the inner circle radius is R2 (R2 = R1 + 1.0 mm). Strengthening ribs are additionally arranged on the annular baffle II to enhance the bending strength.

[0063] The two semi-circular ring rubber blocks 2 are made of polyurethane rubber, with a height H1 (H1 = L2 - L1), an outer circle radius R3, and an inner circle diameter R4 (R4 = D1 / 2 - 2 mm). They are respectively placed between the upper and lower baffles of the semi-circular shell opening flange 3. The two semi-circular shell opening flanges 3 are connected by bolts of the rectangular flanges, which press the two semi-circular ring rubber blocks 2 between them, and then press the seat cross beam 1, realizing the stable holding of the seat cross beam 1.

[0064] The circular shear disc arranged on the seat cross beam 1 is inserted into the annular groove in the annular baffle II below the semi-circular shell opening flange 3, realizing the connection between the energy absorption device and the seat.

[0065] When the vehicle is subjected to an explosion impact, the impact force on the seat cross beam 1 reaches the starting force, the shear disc on the seat cross beam 1 is sheared, the impact is weakened, the initial impact peak is reduced, the seat and the vehicle body are decoupled, the energy absorption device is removed from the axial movement limitation of the lightning protection seat, and then the seat cross beam 1 continues to move, the held semi-circular ring rubber blocks 2 realize the absorption of impact energy and vibration filtering through the three mechanisms of continuous friction, damping and deformation.

[0066] The rotating guide pipe 6 is made of 45 steel, with circular flanges arranged at the upper and lower ends. The nominal diameter, screw hole diameter, and screw hole center circle diameter are matched with the semi-circular flange of the semi-circular shell opening flange 3. The bolt holes are 2*N2. The semi-circular flange below the semi-circular shell opening flange 3 is connected with the upper end flange of the rotating guide pipe 6 by bolts and spinning.

[0067] The total length of the rotating guide pipe 6 is L3, the bottom is closed, the inner wall diameter is D2, and N3 (N3 is 4, 6, or 8) bolt holes are arranged on the inner wall, with the axis of the rotating guide pipe 6 as the spiral axis. The starting point is located on the inner circle of the upper end surface of the rotating guide pipe 6. The pitch is P1, and the height is H2 (H2 < L3, P1 = 2*H2). The guide groove is downwardly spiraled. The cross section of the guide groove perpendicular to the spiral line is a square cross section with a side length of S1.

[0068] N4 limit blocks I and N5 limit blocks II are uniformly distributed around the circumference of the bottom of the rotating guide pipe 6. The limit block I is concave, with a height of h1 and back to the inner wall of the rotating guide pipe 6. The limit block II is a single circular arc quadrilateral, with a diameter of D3 and a height of h2.

[0069] Rotary pressure head 8 is made of 40Cr alloy steel, the main structure is the stepped ring structure of N3 spiral slider around; The upper part is provided with an annular groove with a small diameter D4 and a large diameter D5, the annular groove has a depth d1, and the annular groove has a boss with a height H3 (H3 < d1); The lower part of the rotary pressure head 8 is a hollow annular; The bottom surface of the rotary pressure head 8 is provided with a U-shaped annular groove, the U-shaped annular groove has a diameter D6, a width w1 and a height H5 (H5 = w1 / 2 + 1mm); The inner bottom surface of the hollow annular is provided with two circular ring-shaped welding positioning blocks with a length L1 and an inner diameter D7 with a thickness of 2mm.

[0070] The spiral sliders of the rotary pressure head 8 annular array are consistent with the pitch, rotation direction and cross-sectional shape of the spiral groove of the rotary guide pipe 6, the spiral sliders are flush with the lower end surface of the rotary pressure head 8, and the height H6.

[0071] The inner and outer diameter sizes of the thrust bearing 9 are consistent with the inner and outer diameter sizes of the annular groove above the rotary pressure head 8, and the height H7 (d1 > H7 > H3); The bearing cover 10 is a flat disc with a thickness T1 (d1 > H7 + T1), and the diameter is consistent with the outer diameter of the thrust bearing 9.

[0072] The thrust bearing 9 is below, the bearing cover 10 is above, and the annular groove above the rotary pressure head 8 is sequentially installed, the spiral sliders of the rotary pressure head 8 are matched with the spiral guide groove of the rotary guide pipe 6, and the whole rotary spinning mechanism is installed together.

[0073] The lower part of the rotary pressure head 8 is provided with a positioning block, and when the rotary compression pipe 7 is welded with the rotary pressure head 8, it is necessary to ensure that the welding positioning block below the rotary pressure head 8 contacts the outer side of the semi-I-shaped clamping groove of the rotary compression pipe 7, so as to ensure that after the rotary pressure head 8 and the rotary compression pipe 7 are connected, when the rotary pressure head 8 is installed into the rotary guide pipe 6, the limiting teeth at the lower end of the rotary compression pipe 7 can be correctly matched with the limiting block of the rotary guide pipe 6.

[0074] When the vehicle is subjected to explosion impact, the seat roof beam 1 is decoupled from the connecting guide mechanism and continues to move downward, collides with the rotary spinning mechanism and pushes the rotary pressure head 8 to move spirally downward along the spiral guide groove in the rotary guide pipe 6.

[0075] The axial compression pipe 5 and the rotary compression pipe 7 are made of aluminum alloy, and the I-shaped rubber strip 4 is made of polyurethane rubber.

[0076] The axial compression pipe 5 is a double-layer hollow pipe, each layer has a thickness T2, and the interval is T3 (T2*2+T3=w1), the upper end of the compression pipe is a reverse U-shaped structure formed by the combination of the inner and outer layers, the reverse U-shaped structure is consistent with the U-shaped ring groove structure in the rotating pressure head 8 in size, and the middle diameter of the axial compression pipe 5 is D6; the bottom of the axial compression pipe 5 is provided with N4 rectangular limiting blocks III, which are consistent with the concave groove of the limiting block I in the rotating guide pipe 6 in size, and the height of the limiting block III is H8 (H8=h1-2mm).

[0077] The rotating compression pipe 7 has a wall thickness T4 and an inner diameter D3, which is consistent with the diameter of the circular arc of the limiting block II in the rotating guide pipe 6, and N6 half I-shaped clamping grooves are uniformly distributed on the outer part of the rotating compression pipe 7, and the thickness of the half I-shaped clamping grooves is consistent with the wall thickness of the rotating compression pipe 7; the bottom of the rotating compression pipe 7 is provided with N5 protrusions, which are in the shape of an inclined quadrilateral, and the inclined direction is consistent with the rotating direction of the spiral guide groove in the rotating guide pipe 6, in particular, the contact surface of the limiting block II in the rotating guide pipe 6 is completely parallel to the contact surface of the protrusion in the rotating compression pipe 7, and the height of the protrusion is h3 (h3<h2).

[0078] The I-shaped rubber strip 4 is as long as the rotating compression pipe 7, and is tightly clamped in the half I-shaped clamping groove, and the other half is tightly attached to the inner wall of the axial compression pipe 5.

[0079] The upper end of the rotating compression pipe 7 is welded to the rotating pressure head 8 under the positioning of the positioning block. The reverse U-shaped upper end of the axial compression pipe 5 is matched with the U-shaped ring groove of the rotating pressure head 8, and is not connected.

[0080] The seat roof beam 1, the semicircular shell-shaped open flange 3, the axial compression pipe 5, the rotating guide pipe 6, the rotating compression pipe 7 and the rotating pressure head 8 are coaxial, the axial compression pipe 5 and the rotating compression pipe 7 are arranged at the bottom of the rotating guide pipe 6, the rectangular limiting block of the axial compression pipe 5 is inserted into the groove of the limiting block I at the bottom of the rotating guide pipe 6, and the protrusion of the rotating compression pipe 7 is tightly attached to the semicircular arc quadrilateral limiting block II of the rotating guide pipe 6.

[0081] When the axial compression pipe 5 and the rotating compression pipe 7 are not working, the rotating pressure head 8 limits the axial displacement of the axial compression pipe 5 and the rotating compression pipe 7, the clamping groove and the limiting block at the bottom of the rotating guide pipe 6 limit the rotation of the axial compression pipe 5 and the rotating compression pipe 7, when the rotating pressure head 8 is impacted and moves downward spirally, the rotating compression pipe 7 starts to twist, and at the same time, the rotating pressure head 8 compresses the entire energy absorption mechanism downward, the energy absorption mechanism absorbs the impact energy through the plastic deformation of the twisting of the rotating compression pipe 7 and the axial compression of the axial compression pipe 5 and the rotating compression pipe 7, at the same time, only the rotating compression pipe 7 twists along the axial direction, and the axial compression pipe 5 does not twist, so that the relative rotation between the rotating compression pipe 7 and the axial compression pipe 5 is generated, the I-shaped rubber strip 4 clamped around the rotating compression pipe 7 twists together with the rotating compression pipe and rubs with the axial compression pipe 5 to generate heat and dissipate the impact energy.

[0082] The seat roof beam 1 can realize the change of the starting force of the energy absorption device by changing the thickness of the circular shear disc, optimizing the layout and size of the segmented annular cutting groove, etc. The energy absorption power of the energy absorption device can be adjusted by changing the material, thickness, width of the semicircular annular rubber block 2, the axial compression pipe 5, the rotary compression pipe 7 and the I-shaped rubber strip 4, and the arrangement form of the I-shaped rubber strip 4.

[0083] The materials of the axial compression pipe 5 and the rotary compression pipe 7 can be replaced by recoverable materials such as polypropylene (pp) synthetic resin, so as to realize the recycling of the energy absorption device.

[0084] The rotary guide pipe 6 and the rotary pressure head 8 can adjust the dominant form of energy absorption in the working process of the energy absorption mechanism by changing the helix angle. Reducing the helix angle and increasing the number of helixes can adjust the energy absorption mechanism to the form of torsion and torsion friction of the I-shaped rubber strip 4 as the dominant energy absorption form. Increasing the helix angle and reducing the number of helixes can adjust the energy absorption mechanism to the form of compression of the axial compression pipe 5 and the rotary compression pipe 7 as the dominant energy absorption form.

[0085] The energy absorption mechanism is placed inside the rotary guide pipe 6. When the energy absorption device works, the maximum working stroke depends on the thickness of the energy absorption mechanism completely twisted and crushed and stacked at the bottom of the rotary guide pipe 6. Correspondingly, increasing the internal volume of the rotary guide pipe 6 can improve the working stroke of the energy absorption device, and vice versa.

[0086] In the high-speed impact after the vehicle is subjected to the explosion of a mine or an improvised explosive device, the high-speed impact is transmitted to the rotating guide pipe 6, the semicircular shell-shaped open flange 3 and the mine-proof seat roof beam 1 at the bottom of the vehicle body. When the impact force reaches the starting force that can shear the circular shear disc of the seat roof beam 1, the mine-proof seat is decoupled from the vehicle body, the first step of energy absorption is carried out, and the energy-absorbing device is started. Then the seat roof beam 1 moves downward relative to the vehicle body, the semicircular ring rubber block 2 clamped on the seat roof beam 1 generates friction with it, and the energy absorption and shock absorption continue throughout the working stroke of the energy-absorbing device. The seat roof beam 1 moves downward and hits the bearing cover 10, and the impact is transmitted to the rotating ram 8 through the bearing cover 10 and the thrust bearing 9. The rotating ram 8 starts to move downward spirally along the spiral guide groove of the rotating guide pipe 6 under the action of the impact force, drives the axial compression pipe 5 to compress and plastically deform, drives the rotating compression pipe 7 to twist and compress and plastically deform, and at the same time the relative movement between the rotating compression pipe 7 and the axial compression pipe 5 causes the torsion and friction of the I-shaped rubber strip. The three parts work together to absorb a large amount of impact energy, greatly attenuate the impact amplitude suffered by the occupant, increase the impact time suffered by the occupant, and effectively reduce the injury risk of the occupant. The device can adjust the starting force of the energy-absorbing device by changing the size of the circular shear disc on the seat roof beam 1 and optimizing the size of the segmented annular reduction groove, so as to better adapt to the protection of occupants of different weights and more diverse working environments. In addition, by changing the thickness, material of the axial compression pipe 5 and the rotating compression pipe 7, the material, size and arrangement form of the I-shaped rubber strip 4, the energy-absorbing power of the energy-absorbing device can be adjusted, and the multi-working-condition adaptability can be improved.

Claims

1. A spinning friction type vehicle mine-proof seat mounting energy absorption device, characterized in that, The connecting guide mechanism is arranged between the seat and the bottom of the vehicle and comprises a seat cross beam (1), two semi-circular ring rubber blocks (2) and two semi-circular shell open flanges (3). The connecting guide mechanism is arranged between the seat and the bottom of the vehicle and comprises a seat cross beam (1), two semi-circular ring rubber blocks (2) and two semi-circular shell open flanges (3). The rotating mechanism comprises a rotating pressure head (8), a rotating guide pipe (6), a thrust bearing (9) and a bearing cover (10). The rotating guide pipe (6) is in the shape of a cylinder with a closed bottom, and circular flanges are arranged at the upper and lower ends of the rotating guide pipe (6). A spiral downward guide groove is formed in the inner wall of the rotating guide pipe (6), and limit blocks I and II are arranged in an annular array at the bottom of the rotating guide pipe (6) to limit the rotation of the energy absorption mechanism. The rotating guide pipe (6) is connected to the semi-circular shell open flanges (3) through the upper circular flange and the lower circular flange. The rotating pressure head (8) is in the shape of a stepped ring with an annular array of spiral sliders on the outer periphery. The spiral sliders in the annular array are matched with the spiral guide groove in the rotating guide pipe (6) to form a moving pair. An annular groove is formed in the upper part of the rotating pressure head (8) for mounting the thrust bearing (9) and the bearing cover (10), and a hollow ring is formed in the lower part of the rotating pressure head (8), and a ring groove with a U-shaped cross section is formed in the inner bottom surface of the hollow ring for matching the energy absorption mechanism. The rotating pressure head (8) is matched with the spiral guide groove in the rotating guide pipe (6) through the spiral sliders, so that the rotating pressure head (8) generates spiral downward movement when subjected to impact, and converts the axial impact into spiral movement. The connecting guide mechanism is arranged between the seat and the bottom of the vehicle and comprises a seat cross beam (1), two semi-circular ring rubber blocks (2) and two semi-circular shell open flanges (3). The circular shear disc is provided on the seat cross beam (1), and the annular groove II is provided on the lower annular baffle of the semi-circular shell open flange (3).

2. The energy absorbing device of claim 1, wherein During assembly, the circular shear disc of the seat cross beam (1) is inserted into the annular groove II in the lower annular baffle of the semi-circular shell open flange (3), the two semi-circular ring rubber blocks (2) are arranged between the annular baffles I and II of the two semi-circular shell open flanges (3), and the two semi-circular shell open flanges (3) are connected through the side rectangular flanges and press the two semi-circular ring rubber blocks (2) tightly around the seat cross beam (1) to tightly hold the lightning-proof seat cross beam (1), and the lower semi-circular flange of the semi-circular shell open flange (3) is connected to the rotating mechanism. The circular shear disc of the seat cross beam (1) is provided with a segmented annular reduction groove, and the starting force of the energy absorption device is adjusted by changing the thickness of the circular shear disc and the layout and size of the segmented annular reduction groove. The two semi-circular shell open flanges (3) are made of steel, and the annular baffles II on the inner periphery of the two semi-circular shell open flanges (3) are provided with reinforcing ribs which are arranged on the inner walls of the two semi-circular shell open flanges (3).

3. The energy absorbing device of claim 2, wherein ​ ​ The side edges of the two half-circular shell-shaped open flanges (3) are connected by a rectangular flange through bolts.

4. The energy absorbing device of claim 3, wherein The material of the rotating guide pipe (6) is steel, the total length is L3, and the inner wall is provided with N3 helical guide grooves with the axis of the rotating guide pipe (6) as the helical axis, the starting point being located on the inner circle of the upper end surface of the rotating guide pipe (6), the pitch being P1, the height being H2, and the helical guide grooves being downward; the cross section of the guide groove perpendicular to the helical line is a square cross section with a side length of S1, wherein H2 < L3, and P1 = 2*H2. The bottom plate of the rotating guide pipe (6) is uniformly provided with N4 limiting blocks I and N5 limiting blocks II in the circumferential direction; the limiting block I is a concave shape, back to the inner wall of the rotating guide pipe (6), and the height is h1; the limiting block II is a single circular arc quadrilateral, the circular arc is concentric with the inner circle of the bottom of the rotating guide pipe (6), the diameter of the circle on which the circular arc is located is D3, and the height of the limiting block II is h2. The rotating guide pipe (6) and the rotating pressure head (8) change the pitch angle of the helical line to adjust the dominant form of energy absorption in the working process of the energy absorption mechanism.

5. The energy absorbing device of claim 4, wherein, The material of the rotating pressure head (8) is alloy steel, and the inner bottom surface of the hollow ring is provided with a circular ring-shaped welded positioning block; The helical sliders of the annular array of the rotating pressure head (8) are flush with the lower end surface of the rotating pressure head (8); The thrust bearing (9) is below, the bearing cover (10) is above, and they are sequentially installed in the annular groove above the rotating pressure head (8); the helical sliders of the rotating pressure head (8) are matched with the helical guide grooves of the rotating guide pipe (6), and the whole spinning mechanism is installed together.

6. The energy absorbing device of claim 5, wherein, The composite multi-field coupling energy absorption mechanism comprises an axial compression pipe (5), a rotating compression pipe (7), and an I-shaped rubber strip (4); The axial compression pipe (5) is matched with the U-shaped groove of the rotating pressure head (8) through the U-shaped flange at the upper end; The bottom of the axial compression pipe (5) is provided with a plurality of rectangular limiting blocks III matched with the limiting blocks I of the rotating guide pipe (6); The inner diameter of the rotating compression pipe (7) is consistent with the diameter of the circular arc of the limiting block II in the rotating guide pipe (6), and the outside is uniformly provided with a plurality of half I-shaped clamping grooves in the circumferential direction; the inner periphery of the bottom of the rotating compression pipe (7) is provided with a protruding tooth matched with the limiting block II of the rotating guide pipe (6), and the shape of the protruding tooth is an inclined quadrilateral, and the inclination direction is consistent with the rotation direction of the helical guide groove in the rotating guide pipe (6); The rectangular limiting blocks III of the axial compression pipe (5) and the protruding teeth of the rotating compression pipe (7) are matched with the limiting blocks at the bottom of the rotating guide pipe (6) to limit the rotation of the energy absorption mechanism; The I-shaped rubber strip (4) is clamped into the half I-shaped clamping grooves on one side, and is tightly attached to the inner wall of the axial compression pipe (5) on the other side.

7. The energy absorbing device of claim 6, wherein The seat roof beam (1), the half-circular shell-shaped open flange (3), the axial compression pipe (5), the rotating guide pipe (6), the rotating compression pipe (7), and the rotating pressure head (8) are coaxially arranged; The material of the axial compression pipe (5) is aluminum alloy, and the axial compression pipe (5) is a double-layer hollow pipe with both ends closed. The thickness of the half I-shaped slot of the rotary compression pipe (7) is consistent with the wall thickness of the rotary compression pipe, the contact surface of the limiting block II in the rotary guide pipe (6) is completely parallel to the contact surface of the convex tooth in the rotary compression pipe (7), and the height of the convex tooth is less than the height of the limiting block II in the rotary guide pipe. The I-shaped rubber strip (4) is equal in length to the rotary compression pipe (7).

8. The energy absorbing device of claim 7, wherein, The energy absorption power of the energy absorption device is adjusted by changing the material, thickness, width of the half circular ring rubber block (2), the axial compression pipe (5), the rotary compression pipe (7) and the I-shaped rubber strip (4), and the arrangement form of the I-shaped rubber strip (4). The materials of the axial compression pipe (5) and the rotary compression pipe (7) are polypropylene pp synthetic resin.

9. A method of energy absorption using the energy absorption device according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: After the vehicle is subjected to high-speed impact after explosion, the high-speed impact on the vehicle body is transmitted to the rotary guide pipe (6), the half circular shell-shaped open flange (3) and the lightning protection seat top and bottom beam (1); When the impact force reaches the starting force of the circular shear disc for shearing the seat top and bottom beam (1), the seat and the vehicle body are decoupled, the energy absorption in the first step is carried out, and the energy absorption device is started; The seat top and bottom beam (1) moves downward relative to the vehicle body, the half circular ring rubber block (2) clamped on the seat top and bottom beam (1) generates friction with the seat top and bottom beam (1), and continuously absorbs energy and reduces vibration in the whole working stroke of the energy absorption device; the seat top and bottom beam (1) moves downward and hits the bearing cover (10), the impact is transmitted to the rotary compression head (8) through the bearing cover (10) and the thrust bearing (9), the rotary compression head (8) starts to move downward along the spiral guide groove of the rotary guide pipe (6) under the action of the impact force, drives the axial compression pipe (5) to compress and plastically deform, drives the rotary compression pipe (7) to produce torsion and compression plastic deformation, and the relative movement between the rotary compression pipe (7) and the axial compression pipe (5) causes the I-shaped rubber strip to twist and rub.

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