Combined rail train energy absorption device

Abstract

The invention discloses a combined type rail train energy absorption device, and relates to the technical field of rail traffic, the energy absorption device comprises anti-creeping teeth, an energy absorption pipe, a planing cutter, a conical head, a mounting seat and an expansion pipe, the energy absorption pipe comprises a first end and a second end, the first end is connected with the anti-creeping teeth, and the second end is in contact with the conical head; a planing cutter is fixedly mounted on the mounting seat and is in contact with the energy absorption pipe; the expansion pipe comprises a first part and a second part which are connected, the first part is attached to the peripheral face of the conical head, and on the plane perpendicular to the length direction of the expansion pipe, the orthographic projection area of the first part is larger than that of the second part. According to the combined type rail train energy absorption device, the energy absorption stability can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit technology, in particular to a combined rail train energy absorption device. BACKGROUND

[0002] With the overall operation speed of the rail train (high-speed rail / subway) increasing, the performance requirements of the passive safety anti-collision system are also increasing, and the large energy absorption requirement of the energy absorption structure is also increasing. It is particularly important to design the large energy absorption and stable and precise cutting force in the limited space of the vehicle body.

[0003] Currently, in the traditional planing type energy absorption structure, the force value is generally low, because it is limited by the mechanical properties of the cut material and the maximum limit that the planing tool can withstand. When the force value is too high, the cutting force is too large, which causes the pressure on the planing tool to be greater than the material failure of the planing tool, and the cutting heat caused by excessive energy melts the planing tool, which causes the cutting edge to be blunt, the friction force to be large, and the cutting force value to be unstable.

[0004] Therefore, the current energy absorption device has the technical problems of single structure, low collision force, small energy absorption, and unstable energy absorption. SUMMARY

[0005] The purpose of the present application is to overcome the above technical deficiencies, and to provide a combined rail train energy absorption device to solve the technical problems of small energy absorption and unstable energy absorption in the prior art.

[0006] To achieve the above technical purpose, the present application adopts the following technical scheme: In a first aspect, the present application provides a combined rail train energy absorption device, which comprises an anti-climb tooth, an energy absorption pipe, a planing tool, a cone head, a mounting seat and an expansion pipe. The energy absorption pipe comprises a first end and a second end, the first end is connected with the anti-climb tooth, and the second end is in contact with the cone head. The mounting seat is fixedly installed with the planing tool, and the planing tool is in contact with the energy absorption pipe. The expansion pipe comprises a first part and a second part connected with each other. The first part is in contact with the outer circumferential surface of the cone head. In a plane perpendicular to the length direction of the expansion pipe, the projected area of the first part is greater than that of the second part.

[0007] In some embodiments, the expansion pipe further comprises a third part connected with the first part and the second part respectively. In a plane perpendicular to the length direction of the expansion pipe, the projected area of the third part gradually decreases in the direction away from the first part.

[0008] In some embodiments, the mounting seat is provided with a tool mounting counterbore, and the planing tool is located in the tool mounting counterbore and fixedly connected with the mounting seat.

[0009] In some embodiments, the first part has a first limiting step, the first limiting step having a first positioning notch aligned with the tool mounting countersunk hole; the mounting base has a second limiting step, the second limiting step and the first limiting step abutting against each other.

[0010] In some embodiments, the energy-absorbing tube is provided with a planing groove near the second end, and at least a portion of the planing tool is located within the planing groove.

[0011] In some embodiments, both the number of planing grooves and the number of planing tools are multiple. The multiple planing grooves are arranged at intervals along the circumference of the energy-absorbing tube, and each planing groove corresponds to a planing tool.

[0012] In some embodiments, the cone head includes a middle connecting portion and an outer ring contact portion, with an annular groove between the middle connecting portion and the outer ring contact portion, the second end of the energy-absorbing tube being located in the annular groove, and the outer ring contact portion contacting the first portion.

[0013] In some embodiments, the outer ring contact portion is provided with a second positioning notch that is aligned with the tool mounting countersunk hole.

[0014] In some embodiments, the intermediate connecting portion is threadedly connected to the energy-absorbing tube.

[0015] In some embodiments, the expansion tube is a seamless steel pipe.

[0016] Compared with the prior art, the combined energy absorption device for rail trains provided by the present invention adopts a force superposition design. During operation, the planing tool cuts the energy absorption tube, and the energy absorption tube drives the cone head to generate crushing force on the expansion tube. The upper and lower energy absorption structures work together to convert the absorption capacity into the upper cutting force and the lower plastic force. This not only avoids failure caused by excessive single-stage energy absorption and ensures cutting stability by superimposing the absorption capacity, but also improves the overall resistance to vertical lateral force of the device by constraining the energy absorption tube with the mounting base, expansion tube, and cone head. Attached Figure Description

[0017] Figure 1 This is an exploded structural diagram of an energy absorption device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an energy absorption device provided in an embodiment of the present invention; Figure 3 This is a top view of the energy-absorbing device provided in this embodiment of the invention, excluding the anti-climb teeth; Figure 4 yes Figure 3 Sectional view of section AA; Figure 5 This is a schematic diagram of the connection structure between the anti-climb teeth and the energy-absorbing tube provided in an embodiment of the present invention; Figure 6This is a schematic diagram of the connection structure between the planing tool, the cone head, and the mounting base provided in an embodiment of the present invention; Figure 7 This is an exploded view of the planing tool, cone head, and mounting base provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of an expansion tube provided in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 100. Energy absorbing device; 110. Anti-climb teeth; 120. Energy-absorbing tube; 121. First end; 122. Second end; 123. Planed groove; 130. Planing tools; 140. Conical head; 141. Intermediate connecting part; 142. Outer ring contact part; 1421. Second positioning notch; 143. Annular groove; 150. Mounting base; 151. Tool mounting countersunk hole; 152. Second limit step; 160. Expansion tube; 161. First part; 1611. First limiting step; 1612. First positioning notch; 162. Second part; 163. Third part. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] As the overall operating speed of rail trains (high-speed rail / metro) increases, the requirements for the performance of passive safety collision avoidance systems are also increasing. The energy absorption capacity of energy-absorbing structures is becoming increasingly important. Within the limited space of the vehicle body, the layout design for large energy absorption and stable and precise cutting force is particularly important.

[0021] Currently, for example, in traditional planing energy-absorbing structures, the overall force value is relatively low because it is limited by the mechanical properties of the material being cut and the maximum limit that the planing tool can withstand. When the force value is too high, the excessive cutting force will cause the pressure on the planing tool to exceed the pressure on its own material, resulting in failure. In addition, the excessive energy will cause the cutting heat to melt the planing tool, resulting in the cutting edge becoming dull, the friction force increasing, and the cutting force value becoming unstable.

[0022] For example, traditional expansion-type energy-absorbing structures absorb energy by expanding the diameter of a thin-walled tube to a certain size using a cone, thereby generating plastic deformation force. However, the upper half of a traditional expansion-type energy-absorbing structure is often a thrust rod of the same length as the lower half. This structure wastes the energy-absorbing space at the front end, making the upper part merely a force transmission component without participating in energy absorption. Traditional planing-type energy-absorbing structures have an energy-absorbing part at the top and a protruding side of the cut material at the bottom, which has no practical use and only accommodates the cut material.

[0023] For example, the cutting depth of the planing tool affects the structural design of the product's suction capacity. Due to the influence of the material being cut, if the cutting depth of the planing tool increases by 1mm, the corresponding planing force will increase by 200kN. This places extremely high demands on the precision of the process assembly. Traditional assembly errors are relatively large and have a significant impact on the cutting force.

[0024] To address the technical problems of low energy absorption and unstable energy absorption, this invention provides a combined energy absorption device for rail trains. This energy absorption device adopts a force superposition design, which results in high energy absorption and good energy absorption stability.

[0025] It should be noted that the combined rail train energy absorption device of the present invention is used in, but not limited to, high-speed trains. For ease of explanation, this invention will only use the application of the energy absorption device in high-speed trains as an example. The principle of the energy absorption device applied to other types of vehicles is essentially the same as that applied to high-speed trains, and will not be described in detail here.

[0026] This application provides a combined rail train energy absorption device 100, such as... Figure 1 and Figure 2 As shown, the energy-absorbing device 100 includes anti-climb teeth 110, an energy-absorbing tube 120, a planing tool 130, a cone head 140, a mounting base 150, and an expansion tube 160. The energy-absorbing tube 120 includes a first end 121 and a second end 122. The first end 121 is connected to the anti-climb teeth 110, and the second end 122 is in contact with the cone head 140. The mounting base 150 fixes the planing tool 130, which is in contact with the energy-absorbing tube 120. The expansion tube 160 includes a first part 161 and a second part 162 connected together. The first part 161 is in contact with the outer peripheral surface of the cone head 140. On a plane perpendicular to the length direction of the expansion tube 160, the orthographic projection area of ​​the first part 161 is larger than the orthographic projection area of ​​the second part 162.

[0027] The anti-climb tooth 110 is a critical safety component used to prevent trains from overlapping or derailing during a collision. It achieves energy dissipation and track stabilization through meshing and locking. The material of the anti-climb tooth 110 is not limited, as long as it meets strength requirements; for example, carbon steel, high-strength steel, and aluminum alloys are acceptable.

[0028] The energy-absorbing tube 120 is a component used for absorbing energy during planing, such as seamless steel pipes, alloy steel pipes, etc.

[0029] The planing tool 130 is a component used for planing the energy-absorbing tube 120. The cutting edge of the planing tool 130 contacts the energy-absorbing tube 120, and as the energy-absorbing tube 120 moves, planing and energy absorption are achieved. The material of the planing tool 130 is not limited, as long as it meets the strength requirements, such as alloy steel.

[0030] The cone 140 is a component used to expand the diameter of the expansion tube 160. The outer circumferential surface of the cone 140 is in contact with the first part 161 of the expansion tube 160. As the energy-absorbing tube 120 moves, the cone 140 can move to the second part 162 of the expansion tube 160, expanding the diameter of the expansion tube 160 and causing plastic deformation to generate crushing force. The structural shape of the cone 140 is not limited, as long as it meets the expansion requirements, such as a cylinder or a cone. The material of the cone 140 is also not limited, as long as it meets the strength requirements, such as alloy steel.

[0031] Mounting base 150 is a component used to fix planing tool 130 and expansion tube 160. The position of planing tool 130 on mounting base 150 is not limited, and relevant embodiments will be given later.

[0032] The expansion tube 160 is a component used for expansion and energy absorption. The expansion tube 160 includes a first part 161 and a second part 162. The first part 161 and the second part 162 can be directly connected or indirectly connected through other parts. The aperture of the second part 162 is smaller than the aperture of the first part 161. The cone 140 moves from the first part 161 to the second part 162 of the expansion tube 160 under the movement of the energy absorption tube 120, causing the expansion tube 160 to undergo plastic deformation and generate crushing force, thereby realizing the second-stage expansion and plastic energy absorption.

[0033] The material of the expansion tube 160 is not limited, as long as it meets the strength requirements. For example, the expansion tube 160 can be made of seamless steel pipe. By using seamless steel pipe as the material for the expansion tube 160, the seamless steel pipe has a more uniform wall thickness and better mechanical properties, which can withstand greater expansion pressure without breaking, improve the reliability of the plastic energy absorption stage, and extend the service life of the expansion tube.

[0034] To facilitate understanding, the working principle of the energy absorption device 100 will be explained.

[0035] When a train collides with another train, the impact force pushes the anti-climbing tooth 110, causing the energy-absorbing tube 120 to move inwards. At this time, the planing tool 130 on the mounting base 150 contacts the energy-absorbing tube 120 and planes it, achieving the first stage of planing energy absorption. As the energy-absorbing tube 120 continues to move, it drives the cone 140 to move synchronously. The outer circumference of the cone 140 comes into contact with the first part 161 of the expansion tube 160 and expands the diameter of the expansion tube 160, causing the expansion tube 160 to undergo plastic deformation and generate crushing force, achieving the second stage of diameter expansion plastic energy absorption. The two energy-absorbing structures work together to convert the energy absorption capacity into cutting force at the upper end and plastic force at the lower end, achieving stable energy absorption through the superposition of force values.

[0036] In this embodiment, the energy absorption device 100 adopts a force superposition design. During operation, the planing tool 130 cuts the energy absorption tube 120, and the energy absorption tube 120 drives the cone head 140 to expand the diameter of the expansion tube 160, generating a crushing force. The upper and lower energy absorption structures work together to convert the absorption capacity into the upper cutting force and the lower plastic force. This not only avoids failure caused by excessive single-stage energy absorption and ensures cutting stability by superimposing the absorption capacity, but also improves the overall anti-vertical lateral force capability of the device by constraining the energy absorption tube 120 with the mounting base 150, the expansion tube 160, and the cone head 140.

[0037] In some embodiments, such as Figure 3 and Figure 4 As shown, the expansion tube 160 also includes a third part 163, which is connected to the first part 161 and the second part 162 respectively. On a plane perpendicular to the length direction of the expansion tube 160, the projected area of ​​the third part 163 gradually decreases in the direction away from the first part 161.

[0038] In this embodiment, the first part 161 and the second part 162 of the expansion tube 160 are connected by a third part 163 with a gradually changing orthographic projection area, so that the inner diameter of the expansion tube 160 forms a tapered structure with a smooth transition. This design allows the cone 140 to be subjected to stable force during the expansion process, avoiding stress concentration caused by abrupt changes in tube diameter, making the force output during the plastic energy absorption stage more stable, and further improving the energy absorption stability of the entire device.

[0039] In some embodiments, such as Figure 6 and Figure 7 As shown, the mounting base 150 is provided with a tool mounting countersunk hole 151, and the planing tool 130 is located in the tool mounting countersunk hole 151 and is fixedly connected to the mounting base 150.

[0040] In this embodiment, the planing tool 130 is fixed in the tool mounting countersunk hole 151 by fasteners. The number of tool mounting countersunk holes 151 matches the number of planing tools 130. The structural shape of the tool mounting countersunk holes 151 only needs to meet the installation requirements of the planing tools 130, such as square countersunk holes, circular countersunk holes, etc. By setting the tool mounting countersunk holes 151 in the mounting base 150 and installing the planing tool 130 in the countersunk holes, the planing tool 130 can be radially limited, preventing the planing tool 130 from shifting or shaking during the planing process. At the same time, the countersunk hole structure can distribute the impact force on the planing tool 130, reduce the risk of the planing tool 130 failing due to uneven force, and extend the service life of the planing tool 130.

[0041] In some embodiments, such as Figure 7 and Figure 8 As shown, the first part 161 has a first limiting step 1611, and the first limiting step 1611 has a first positioning notch 1612 that is directly opposite to the tool mounting countersunk hole 151; the mounting base 150 has a second limiting step 152, and the second limiting step 152 and the first limiting step 1611 abut against each other.

[0042] In this embodiment, the first limiting step 1611 is located at the end of the first part 161 away from the second part 162, and the second limiting step 152 is located inside the mounting base 150. The mutual abutment between the second limiting step 152 and the first limiting step 1611 achieves precise positioning of the mounting base 150 and the expansion tube 160. Simultaneously, the first positioning notch 1612 on the first limiting step 1611 aligns with the tool mounting countersunk hole 151, providing space for the planing tool 130. The planing tool 130 can restrict the circumferential movement of the expansion tube 160, preventing circumferential rotation during cutting. This structural design improves the assembly accuracy of the various components of the device, ensures stable cutting force values, and thus enhances the energy absorption stability of the entire device.

[0043] In some embodiments, such as Figure 5 and Figure 6 As shown, the energy-absorbing tube 120 is provided with a planing groove 123, which is close to the second end 122, and at least a portion of the planing tool 130 is located in the planing groove 123.

[0044] In this embodiment, the depth of the planing groove 123 is related to the energy absorption effect, and the specific depth can be determined according to actual needs. By setting the planing groove 123 near the second end 122 of the energy absorption tube 120, and ensuring that the planing tool 130 is at least partially located within the planing groove 123, pre-positioning of the planing tool 130 and the energy absorption tube 120 can be achieved. The planing groove 123 can guide the cutting trajectory of the planing tool 130, preventing slippage during cutting, and reducing the initial cutting resistance of the planing tool 130, making the cutting process smoother and improving the stability of the planing energy absorption stage.

[0045] In some embodiments, such as Figure 5 and Figure 6 As shown, there are multiple planing grooves 123 and multiple planing tools 130. The multiple planing grooves 123 are arranged at intervals along the circumference of the energy-absorbing tube 120, and the planing grooves 123 correspond one-to-one with the planing tools 130.

[0046] In this embodiment, multiple planing grooves 123 are arranged at intervals along the circumference of the energy-absorbing tube 120. These intervals can be uniform or non-uniform. The number of planing grooves 123 can be determined according to requirements, such as 2, 3, 4, 5, etc. By setting multiple circumferentially spaced and one-to-one corresponding planing grooves 123 and planing tools 130, uniform circumferential cutting of the energy-absorbing tube 120 can be achieved, ensuring balanced circumferential force on the energy-absorbing tube 120. This avoids uneven deformation of the energy-absorbing tube 120 due to excessive local cutting force, thus improving the stability of the planing energy absorption stage.

[0047] In some embodiments, such as Figure 4 and Figure 7 As shown, the cone head 140 includes an intermediate connecting part 141 and an outer ring contact part 142. An annular groove 143 is provided between the intermediate connecting part 141 and the outer ring contact part 142. The second end 122 of the energy absorption tube 120 is located in the annular groove 143, and the outer ring contact part 142 is in contact with the first part 161.

[0048] In this embodiment, the cone head 140 has a structure consisting of an intermediate connecting part 141, an outer ring contact part 142, and an annular groove 143. Placing the second end 122 of the energy-absorbing tube 120 in the annular groove 143 enables precise docking between the energy-absorbing tube 120 and the cone head 140, ensuring that the thrust of the energy-absorbing tube 120 can be stably transmitted to the cone head 140. Furthermore, the outer ring contact part 142 fits against the first part 161 of the expansion tube 160, which increases the contact area between the cone head 140 and the expansion tube 160, making the expansion force evenly distributed, avoiding excessive local deformation of the expansion tube 160, and improving the stability of the plastic energy absorption stage.

[0049] In some embodiments, such as Figure 7 andFigure 8 As shown, the outer ring contact portion 142 is provided with a second positioning notch 1421 that is directly opposite to the tool mounting countersunk hole 151.

[0050] In this embodiment, the outer ring contact portion 142 is provided with a second positioning notch 1421 that is directly opposite to the tool mounting countersunk hole 151. It can cooperate with the first positioning notch 1612 to further optimize the assembly positioning accuracy of the device, ensure the relative position of the planing tool 130, energy absorption tube 120, cone 140 and expansion tube 160 is accurate, and avoid the problem of cutting or diameter expansion failure caused by component misalignment.

[0051] In some embodiments, the intermediate connecting portion 141 is threadedly connected to the energy-absorbing tube 120.

[0052] In this embodiment, the intermediate connecting part 141 is provided with external threads, and the inner wall of the energy-absorbing tube 120 is provided with internal threads. By connecting the intermediate connecting part 141 of the cone 140 with the energy-absorbing tube 120 by threads, the threaded connection structure has high connection strength, which can ensure that the energy-absorbing tube 120 and the cone 140 will not separate during the collision, thus ensuring the stable transmission of force.

[0053] To better understand this invention, the following is combined with... Figures 1 to 8 The technical solution of the present invention will be described in detail below: In some embodiments, the energy-absorbing device 100 includes anti-climb teeth 110, energy-absorbing tube 120, planing tool 130, cone 140, mounting base 150, and expansion tube 160.

[0054] The energy-absorbing tube 120 includes a first end 121 and a second end 122. The first end 121 is connected to the anti-climb tooth 110, and the second end 122 is in contact with the cone head 140. The energy-absorbing tube 120 is provided with four planing grooves 123 near the second end 122. The four planing grooves 123 are evenly spaced along the circumference of the energy-absorbing tube 120.

[0055] The planing tool 130 is positioned and fixed by the mounting base 150. The mounting base 150 is provided with a tool mounting countersunk hole 151. The planing tool 130 is located in the tool mounting countersunk hole 151 and is fixedly connected to the mounting base 150. The number of planing tools 130 is consistent with and corresponds one-to-one with the planing grooves 123. At least part of them are located in the planing grooves 123 to achieve contact and cooperation with the energy absorption tube 120.

[0056] The cone head 140 includes a middle connecting part 141 and an outer ring contact part 142, with an annular groove 143 between them. The second end 122 of the energy-absorbing tube 120 is located in the annular groove 143 to improve the stability of the fit. The middle connecting part 141 is threadedly connected to the energy-absorbing tube 120, and the outer ring contact part 142 contacts the first part 161 of the expansion tube 160. The outer ring contact part 142 is provided with a second positioning notch 1421 that is directly opposite to the tool mounting countersunk hole 151.

[0057] The expansion tube 160 includes a first part 161, a third part 163, and a second part 162 connected in sequence. The first part 161 fits against the outer peripheral surface of the cone head 140 and has a first limiting step 1611, which has a first positioning notch 1612 that is directly opposite to the tool mounting countersunk hole 151. The mounting base 150 has a second limiting step 152, which abuts against the first limiting step 1611 to achieve axial limiting. On a plane perpendicular to the length direction of the expansion tube 160, the projected area of ​​the first part 161 is larger than that of the second part 162; the projected area of ​​the third part 163 gradually decreases in the direction away from the first part 161, forming a transition structure.

[0058] In this embodiment, the upper section employs a planing energy-absorbing structure, while the lower section features a conical expansion energy-absorbing structure. Through force superposition design, the energy absorption capacity is precisely converted into upper cutting force and lower plastic force, thereby ensuring the stability of the cutting process. In terms of structural design, a mistake-proof assembly scheme is adopted, eliminating the need for repeated dimensional measurements during assembly and achieving zero-error assembly. With the coordinated constraint of the energy-absorbing tube 120 by the mounting base 150, expansion tube 160, and conical head 140, the energy-absorbing device 100 significantly improves its overall resistance to vertical loads. Furthermore, relying on the precise matching between the various structures, the planing tool 130 is not only easy to install and less prone to errors, but also enables precise control of the cutting depth, ensuring stable planing force output. Simultaneously, a modular design is adopted, allowing flexible adaptation to different cutting force requirements. Simply adjusting the cutting depth of the planing tool 130, the material of the energy-absorbing tube 120, the wall thickness of the expansion tube 160, and the outer diameter of the conical head 140 allows for rapid response and matching of the target cutting force value.

[0059] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A combined rail train energy absorption device, characterized in that, The utility model relates to a kind of anti-climbing tooth and the cutter head of energy absorption pipe, and the utility model discloses the following technical scheme: Energy absorption pipe, comprising first end and second end, the first end is connected with anti-climbing tooth, the second end is in contact with cone head; Mounting seat, fixedly installed planing tool, the planing tool is in contact with the energy absorption pipe; Expansion pipe, comprising connected first part and second part, the first part is attached to the outer circumferential surface of the cone head, in the plane perpendicular to the length direction of the expansion pipe, the first part orthographic projection area is greater than the second part orthographic projection area.

2. The modular railcar energy absorbing device of claim 1, wherein, The expansion pipe further includes third part, the third part is connected with the first part and the second part respectively, in the plane perpendicular to the length direction of the expansion pipe, the third part orthographic projection area gradually reduces in the direction away from the first part.

3. The modular railcar energy absorbing device of claim 1, wherein, The mounting seat is provided with tool mounting counterbore, and the planing tool is located in the tool mounting counterbore and is fixedly connected with the mounting seat.

4. The modular railcar energy absorbing device of claim 3, wherein, The first part has first limiting step, and the first limiting step is provided with first positioning notch opposite to the tool mounting counterbore;The mounting seat has second limiting step, and the second limiting step and the first limiting step abut each other.

5. The modular railcar energy absorbing device of claim 4, wherein, The energy absorption pipe is provided with planing groove, and the planing groove is close to the second end, and at least part of the planing tool is located in the planing groove.

6. The modular railcar energy absorbing device of claim 5, wherein, The number of planing groove and the number of planing tool are multiple, and multiple planing grooves are arranged along the circumference of the energy absorption pipe, and the planing groove and the planing tool are one-to-one corresponding respectively.

7. The modular railcar energy absorbing device of claim 3, wherein, The cone head includes intermediate connecting portion and outer ring contact portion, and the intermediate connecting portion and the outer ring contact portion have annular groove, the second end of the energy absorption pipe is located in the annular groove, and the outer ring contact portion is in contact with the first part.

8. The modular railcar energy absorbing device of claim 7, wherein, The outer ring contact portion is provided with second positioning notch opposite to the tool mounting counterbore.

9. The modular railcar energy absorbing device of claim 7, wherein, The intermediate connecting portion is screw-connected with the energy absorption pipe.

10. The modular railcar energy absorbing device of claim 1, wherein, The expansion pipe is seamless steel pipe.

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