Subway train anti-climb energy absorption device

Abstract

This utility model relates to an anti-climb energy-absorbing device for subway trains, comprising: a mounting base; a corrugated outer shell; a honeycomb energy-absorbing profile; and an anti-climb toothed plate. The anti-climb toothed plate has several interlocking teeth evenly spaced on its end face away from the outer shell to prevent the train from climbing during an impact, maintaining the relative stability of the train's position. The corrugated outer shell is located on the end face of the mounting base and is welded to the mounting base and the anti-climb toothed plate at both ends, improving the overall energy absorption effect. The honeycomb energy-absorbing profile is embedded in the cavity within the corrugated outer shell, integrally formed with the corrugated outer shell. The overall anti-climb energy-absorbing device is easy to install and can effectively absorb and disperse the energy during an impact, protecting the train structure from serious damage, improving the energy absorption effect, and ensuring safety in train collision accidents.

Description

Technical Field

[0001] This disclosure relates to the field of energy absorption technology, specifically to an anti-climbing energy absorption device for subway trains. Background Technology

[0002] With the increasing prevalence of subway trains in cities across China, they have become a primary mode of transportation for most people within cities. They are characterized by high speed and large passenger capacity. Therefore, their passive safety and protection have attracted widespread attention. The field of passive safety focuses more on the train's body structure itself, that is, how structural design and protective devices minimize damage to the train body and thus ensure the safety of passengers in the event of a rear-end collision, derailment, or impact with other objects on the track.

[0003] Anti-climb energy-absorbing devices can be installed at the head and tail of subway train sets. In the event of a rear-end collision, the anti-climb teeth at the head of the train engage with the anti-climb teeth at the tail of the vehicle being hit, preventing the wheelset from lifting and causing derailment. The honeycomb energy-absorbing profile behind the anti-climb teeth will undergo a large degree of wrinkling deformation, thereby absorbing the impact kinetic energy of the train body.

[0004] Existing anti-climb devices have complex structures and are difficult to install. Furthermore, many current anti-climb energy-absorbing devices use a single type of honeycomb energy-absorbing profile cell, limiting their energy absorption effectiveness. Summary of the Invention

[0005] To overcome the problems of existing anti-climb devices having numerous components and complex installation processes, and the fact that many current anti-climb energy-absorbing devices use single-cell honeycomb energy-absorbing profiles with limited energy absorption effects, this utility model provides an anti-climb energy-absorbing device for subway trains.

[0006] To achieve the above objectives, this disclosure provides a subway train anti-climb energy absorption device, comprising:

[0007] Mounting bracket, used for connection to the head or tail of the train set;

[0008] Anti-climb toothed plate;

[0009] A corrugated housing, comprising four connecting surfaces, each connecting surface including a first and a second collapsible section in cross-section, wherein the radius of the concave area of ​​the first collapsible section is smaller than the radius of the concave area of ​​the second collapsible section; the corrugated housing is welded to the mounting base and the anti-climbing tooth plate at its two ends in the front-rear direction, respectively; and

[0010] A honeycomb energy-absorbing profile is installed inside the cavity of the corrugated shell and is integrally formed with the corrugated shell. The honeycomb energy-absorbing profile is perpendicular to the end face of the mounting base in the front-back direction. The honeycomb energy-absorbing profile includes multiple first support areas and multiple second support areas, which are alternately connected in the vertical direction. The first support area includes multiple X-shaped cells and multiple chiral structural cells, which are alternately connected in the left-right direction.

[0011] Optionally, the number of X-shaped cells in each first support region is four, and the cross-section of the X-shaped cells is X-shaped. The number of chiral structural cells in each first support region is three, and the chiral structural cells include a ring and four cutting plates. The middle part of the cutting plate is tangent to the ring, one end of the cutting plate is connected to the middle part of the adjacent cutting plate, and the other end is connected to the sharp corner of the adjacent X-shaped cell.

[0012] Optionally, each of the second support regions includes three axe-shaped cells connected sequentially in the left-right direction, with two adjacent axe-shaped cells sharing two connecting semi-rings.

[0013] Optionally, each of the second support areas includes two end-closed cells and three gap-shaped cells. The width of the gap between the gap-shaped cells is 1-1.5 mm. The three gap-shaped cells are connected sequentially in the left-right direction, and the gap-shaped cells at both ends are respectively connected to the two end-closed cells.

[0014] Optionally, the number of the first support areas is four, and the number of the second support areas is three.

[0015] Optionally, the four circumferential connecting surfaces of the corrugated shell have the same shape, and the connecting surfaces include a first protruding section, a first collapsing section, a second protruding section, and a second collapsing section connected in sequence, wherein the first protruding section is connected to the anti-climbing tooth plate, and the second collapsing section is connected to the mounting base.

[0016] Optionally, the anti-climbing tooth plate has multiple interlocking teeth evenly spaced on the end face away from the corrugated shell.

[0017] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0018] The anti-climb tooth plate prevents the train from climbing over during a collision, maintaining the train's relative position stability. The corrugated shell is welded to the mounting base and anti-climb tooth plate at both ends, forming a closed structural space. The honeycomb energy-absorbing profile is embedded in the cavity inside the corrugated shell, integrally formed with the shell, making the overall anti-climb energy-absorbing device relatively easy to install.

[0019] Furthermore, by alternating the first and second support zones in the vertical direction, and by alternating the X-shaped cells and chiral structural cells in the first support zone in the horizontal direction, the energy during impact can be effectively absorbed and dispersed, thus improving the energy absorption effect. In summary, this device, through the rational layout of its various structures, can effectively prevent train climbing during an impact, while simultaneously ensuring the safety and stability of the train structure by efficiently absorbing impact energy through honeycomb energy-absorbing profiles.

[0020] Furthermore, the axe-shaped unit area of ​​the second support region preferentially induces local buckling through the sharp corner design, guiding the honeycomb structure to fold orderly along the preset path, thereby improving energy absorption efficiency.

[0021] Furthermore, the inverted mountain-shaped unit in the second support area, combined with the end-closed unit, forms a multi-deformation guidance mechanism: the end-closed unit enhances boundary integrity and prevents premature fracture failure; the gap design of the inverted mountain shape can increase the contact area under crush and reduce the peak force, avoiding overall brittle fracture, while dissipating energy through plastic hinges. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an anti-climbing energy-absorbing device for subway trains according to an exemplary embodiment of the present disclosure.

[0023] Figure 2 This is a cross-sectional view of an embodiment of a honeycomb energy-absorbing profile in an anti-climbing energy-absorbing device for subway trains, according to an exemplary embodiment of the present disclosure.

[0024] Figure 3 This is a cross-sectional view of another embodiment of a honeycomb energy-absorbing profile in an anti-climbing energy-absorbing device for subway trains, according to an exemplary embodiment of the present disclosure.

[0025] Figure 4 This is a simulation scenario of an eccentric collision of a metro train at a speed of 25 km / h, as specified in the EN15227:2020 standard.

[0026] Figure 5 for Figure 2 Lateral displacement cloud map of the anti-climb device with corrugated shell filled with honeycomb energy-absorbing profile and eccentric collision.

[0027] Figure 6 for Figure 3 Lateral displacement cloud map of the anti-climb device with corrugated shell filled with honeycomb energy-absorbing profile and eccentric collision.

[0028] Explanation of the reference numerals: 1. Mounting bracket;

[0029] 2. Anti-climbing tooth plate; 21. Biting teeth;

[0030] 3. Corrugated outer shell; 31. Connecting surface; 311. First protruding section; 312. First collapsible section; 313. Second protruding section; 314. Second collapsible section;

[0031] 4. Honeycomb energy-absorbing profile; 41. First support area; 411. X-shaped cell; 412. Chiral structure cell; 4121. Ring; 4122. Cut plate; 42. Second support area; 421. Axe-shaped cell; 4211. Connecting half ring; 422. End-closed cell; 423. Gap-inverted mountain-shaped cell. Detailed Implementation

[0032] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0033] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "front," "rear," "left," and "right" are used for ease of description based on the drawing orientations of the corresponding figures, while "inner" and "outer" are defined based on the contours of the corresponding components themselves. Terms such as "first" and "second" used in this disclosure are used to distinguish one element from another and do not have sequential or importance implications. Furthermore, when the following description refers to the figures, unless otherwise indicated, the same numbers in different figures represent the same or similar elements.

[0034] Please see Figures 1 to 3 This disclosure provides an anti-climb energy-absorbing device for subway trains, comprising: a mounting base 1 for connection to the head or tail of a train set; an anti-climb toothed plate 2; a corrugated shell 3, the corrugated shell 3 being composed of four connecting surfaces, each connecting surface including a first collapsible section and a second collapsible section in cross-section, wherein the radius of the concave area of ​​the first collapsible section is smaller than the radius of the concave area of ​​the second collapsible section, and the two ends of the corrugated shell in the front-rear direction are welded to the mounting base 1 and the anti-climb toothed plate 2 respectively; and a honeycomb energy-absorbing profile 4, installed in the cavity of the corrugated shell 3 and integrally formed with the corrugated shell 3, the honeycomb energy-absorbing profile 4 being perpendicular to the end face of the mounting base 1 in the front-rear direction, the honeycomb energy-absorbing profile 4 including a plurality of first support areas 41 and a plurality of second support areas 42, the plurality of first support areas 41 and the plurality of second support areas 42 being alternately connected in the vertical direction, the first support area 41 including a plurality of X-shaped cells 411 and a plurality of chiral structural cells 412, the plurality of X-shaped cells 411 and the plurality of chiral structural cells 412 being alternately connected in the left-right direction.

[0035] It is understandable that the collision (crushing) direction of the two subway trains refers to the front-to-back direction of the honeycomb energy-absorbing profile 4. The anti-climbing tooth plate 2 prevents the train from creeping during the impact, maintaining the relative stability of the train's position. The corrugated shell 3 is welded to the mounting base 1 and the anti-climbing tooth plate 2 at both ends, forming a closed structural space, improving the overall rigidity and energy absorption function. The honeycomb energy-absorbing profile 4 is embedded in the cavity inside the corrugated shell 3, integrally formed with the corrugated shell 3, making the overall anti-climbing energy-absorbing device relatively easy to install. By alternating the arrangement of the first support area 41 and the second support area 42 in the vertical direction, and by alternating the arrangement of multiple X-shaped cells 411 and chiral structural cells 412 in the first support area 41 in the horizontal direction, the energy during the impact can be effectively absorbed and dispersed, protecting the train structure from serious damage and improving the energy absorption effect. In summary, this device, through the reasonable layout of various components, can effectively prevent the creeping phenomenon of the train during the impact, while the honeycomb energy-absorbing profile 4 efficiently absorbs the impact energy, ensuring the safety and stability of the train structure.

[0036] In one implementation, please refer to Figures 1 to 3 Each first support region 41 has four X-shaped cells 411, each with an X-shaped cross-section. Each first support region 41 also has three chiral structural cells 412, each including a ring 4121 and four cutting plates 4122. The middle of each cutting plate 4122 is tangent to the ring 4121, one end of each cutting plate 4122 is connected to the middle of an adjacent cutting plate 4122, and the other end is connected to the sharp corner of an adjacent X-shaped cell 411. In other words, this honeycomb energy-absorbing profile 4 is designed using 3D modeling software, and all elements satisfy a 4×4 arrangement of X-shaped cells 411.

[0037] In one implementation, please refer to Figure 1 and Figure 2 Each second support region 42 includes three axe-shaped cells 421 connected sequentially in the left-right direction, and two adjacent axe-shaped cells 421 share two connecting semi-rings 4211.

[0038] In one implementation, please refer to Figure 1 and Figure 3 Each second support area 42 includes two end-closed cells 422 and three gap-shaped cells 423. The width of the gap between the gap-shaped cells 423 is 1-1.5mm. The three gap-shaped cells 423 are connected sequentially in the left-right direction. The gap-shaped cells 423 at both ends are connected to the two end-closed cells 422 respectively.

[0039] In one implementation, please refer to Figures 1 to 3 The number of first support zones 41 is four, and the number of second support zones 42 is three.

[0040] In one implementation, please refer to Figure 1 The four circumferential connecting surfaces 31 of the corrugated shell 3 have the same shape. The connecting surfaces 31 include a first protruding section 311, a first collapsible section 312, a second protruding section 313, and a second collapsible section 314 connected in sequence. The first protruding section 311 is connected to the anti-climbing tooth plate 2, and the second collapsible section 314 is connected to the mounting base 1. The concave radius of the first collapsible section 312 is smaller than that of the second collapsible section 314. With this segmented design, the small-radius section can quickly trigger local deformation to absorb high impact energy in the early stage of the collision, and the subsequent large-radius section provides a larger collapsible space, realizing staged and efficient energy dissipation, satisfying good buffering performance, and avoiding damage to the vehicle body structure due to excessive peak load.

[0041] In one implementation, please refer to Figure 1 The anti-climb plate 2 has multiple interlocking teeth 21 evenly spaced on the end face away from the corrugated shell 3.

[0042] In one embodiment, the corrugated shell 3 and the honeycomb energy-absorbing profile 4 are prepared by selective laser melting additive manufacturing technology. Selective laser melting additive manufacturing technology is prior art and will not be described in detail here. The honeycomb energy-absorbing profile 4 is made of AlSi10Mg alloy, which is widely used in the field of additive manufacturing.

[0043] Please see Figure 4 Collision analysis was performed using Pamcrash collision simulation software, with settings for materials, properties, contact, constraints, velocity, and time steps. The materials for the anti-climb teeth and mounting base 1 were set to stainless steel alloy, while the materials for the corrugated pipe and honeycomb energy-absorbing profile 4 were AlSi10Mg. The corrugated pipe thickness was 2.0 mm, and the honeycomb energy-absorbing profile 4 thickness was 1.2 mm. Master-slave contact was established between mounting base 1 and the energy-absorbing structure, between the two anti-climb teeth, and between the anti-climb teeth and the energy-absorbing structure. Self-contact was established between the two energy-absorbing structures (corrugated shell and honeycomb energy-absorbing profile). Master-slave contact refers to the contact between the anti-climb plate (rigid structure) and the deformable body (corrugated shell and honeycomb energy-absorbing profile). Self-contact refers to the contact that controls the plastic deformation of the corrugated shell and the honeycomb energy-absorbing profile under pressure. According to the subway train collision standard in EN15227:2020, the eccentric collision condition at 25km / h must be met. Therefore, the left anti-climb device is set to a horizontal speed of 7m / s in the right direction, and the left anti-climb device needs to be 40mm higher than the right anti-climb device. The mounting base 1 of the right anti-climb device is constrained in three directions for translation and rotation. The time step is set to 0.0005, and the total duration of the collision simulation is within 20ms.

[0044] Combined with appendix Figure 5 Appendix Figure 6The text describes the lateral displacement contour maps of two types of energy-absorbing profiles (a) and (b) forming an anti-climb energy-absorbing device with a corrugated shell 3 under an eccentric collision condition at 25 km / h. Based on the full description, the following conclusion can be drawn: the integrated anti-climb energy-absorbing structure composed of the honeycomb energy-absorbing profile 4 and the corrugated shell 3 exhibits better stability under eccentric collision conditions.

[0045] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0046] The corrugated shell 3 designed in this utility model has multiple crumple sections. In the early stage of a collision, the small radius section can quickly trigger local deformation to absorb high impact energy, while the subsequent large radius section provides continuous crumple space, realizing phased and efficient energy dissipation and avoiding damage to the vehicle body structure caused by excessive peak load.

[0047] The honeycomb energy-absorbing profile 4 designed in this utility model is composed of X-type cells 411, chiral structural cells 412, axe-shaped cells 421, and X-type cells 411, chiral structural cells 412, and inverted mountain-shaped cells. Under the action of collapse load, due to the small gaps between the inverted mountain-shaped cells, it has a large contact area, which reduces the compressive strength between cells, making the wrinkling deformation effect more obvious, thereby enhancing the energy absorption effect during crushing. Under the action of collapse load, the X-type cells 411 and chiral structural cells 412 will shrink inward due to the negative Poisson's ratio effect, making the energy absorption process more complete and lasting.

[0048] This invention utilizes SLM additive manufacturing technology to fabricate a corrugated shell 3 and a honeycomb energy-absorbing profile 4. Compared with traditional milling, turning, planing, and grinding subtractive processing methods, this method significantly saves metal materials, enables more complex integrated designs, improves processing efficiency, and provides an optimal fabrication solution for high energy-absorbing structures.

[0049] This utility model has been described through embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, modifications can be made to these features and embodiments to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A subway train anti-climbing energy absorption device, characterized in that, include: Mounting bracket (1) is used to connect to the head or tail of the train set; Anti-climb tooth plate (2); The corrugated shell (3) is composed of four connecting surfaces. Each connecting surface includes a first collapsing section and a second collapsing section in cross section. The concave radius of the first collapsing section is smaller than that of the second collapsing section. The two ends of the corrugated shell in the front-rear direction are welded to the mounting base (1) and the anti-climbing tooth plate (2) respectively. A honeycomb energy-absorbing profile (4) is filled in the cavity of the corrugated shell (3) and integrally formed with the corrugated shell (3). The honeycomb energy-absorbing profile (4) is perpendicular to the end face of the mounting base (1) in the front-back direction. The honeycomb energy-absorbing profile (4) includes a plurality of first support areas (41) and a plurality of second support areas (42). The plurality of first support areas (41) and the plurality of second support areas (42) are alternately connected in the up-down direction. The first support area (41) includes a plurality of X-shaped cells (411) and a plurality of chiral structural cells (412). The plurality of X-shaped cells (411) and the plurality of chiral structural cells (412) are alternately connected in the left-right direction.

2. The anti-climbing energy absorption device for a subway train according to claim 1, wherein The number of X-shaped cells (411) in each first support region (41) is four, and the cross-section of the X-shaped cells (411) is X-shaped. The number of chiral structural cells (412) in each first support region (41) is three. The chiral structural cells (412) include a ring (4121) and four cutting plates (4122). The middle part of the cutting plate (4122) is tangent to the ring (4121). One end of the cutting plate (4122) is connected to the middle part of the adjacent cutting plate (4122), and the other end is connected to the sharp corner of the adjacent X-shaped cells (411).

3. The anti-climbing energy absorption device for a subway train according to claim 2, wherein Each of the second support regions (42) includes three axe-shaped cells (421) connected in sequence in the left and right directions, and two adjacent axe-shaped cells (421) share two connecting half-rings (4211).

4. The anti-climbing energy absorption device for a subway train according to claim 2, wherein Each of the second support areas (42) includes two end-closed cells (422) and three gap-shaped cells (423). The gap width of the gap-shaped cells (423) is 1-1.5 mm. The three gap-shaped cells (423) are connected sequentially in the left-right direction. The gap-shaped cells (423) at both ends are connected to the two end-closed cells (422) respectively.

5. The anti-climbing energy absorption device for a subway train according to claim 2, wherein The number of the first support area (41) is four, and the number of the second support area (42) is three.

6. The anti-climbing energy absorption device for a subway train according to claim 1, wherein The four circumferential connecting surfaces (31) of the corrugated shell (3) have the same shape. The connecting surfaces (31) include a first protruding section (311), a first collapsing section (312), a second protruding section (313), and a second collapsing section (314) connected in sequence. The first protruding section (311) is connected to the anti-climbing tooth plate (2), and the second collapsing section (314) is connected to the mounting base (1).

7. The subway train anti-climb energy-absorbing device according to claim 1, characterized in that, The end face of the anti-climb plate (2) away from the corrugated shell (3) is provided with multiple engagement teeth (21) at equal intervals.

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