A high-strength aluminum structure for the front end of a rail vehicle

Abstract

A new type of high-strength front aluminum structure is welded by a frame and a skin, and its characteristics are: an integral door frame is welded to the side wall frame of the front of the vehicle near the side of the driver's cab, and the integral door frame is divided into four parts: upper door frame, lower door frame and left and right door frames. The four parts are connected by welding, and the upper and lower door frames are both high-strength aluminum alloy plates with bent ends to ensure the strength of the connection between the integral door frame and the side wall frame. The bottom connecting area of ​​the lower door frame is processed into a beam-column form and welded to the chassis to ensure the matching of the existing vehicle during welding. The left and right door frames are provided with oblong holes and welded to the side walls, and the upper door frame is provided with welding grooves and welded to the original ridge skin at the top. At the same time, the upper door frame is welded to the side wall beams and columns to ensure the overall side wall strength. The present invention can not only ensure the net passing width and height of the door, but also ensure that the boarding door is relatively simple to install and can follow the shape of the front of the vehicle well without too much adjustment, which does not affect the appearance and achieves the function.

Description

Technical Field

[0001] The invention belongs to the technical field of rail vehicle head design, and in particular relates to a high-strength aluminum structure head. Background Art

[0002] As my country's high-speed EMUs mature, demands for functional front-end structures are becoming increasingly stringent. The driver's entry door on my country's high-speed EMUs is typically located on the body of the train, forcing the driver to enter through the door on the lead car and pass through the sightseeing area before reaching the driver's cab, a significant inconvenience. However, placing the driver's entry door on the front of the train would compromise its structural strength and safety. Therefore, designing a new front-end structure that combines both safety and functionality has become a challenging challenge for the industry. Summary of the Invention

[0003] The purpose of the present invention is to provide a new type of high-strength aluminum structure for the front of the train. Under the premise of ensuring safety, the functionality of the aluminum structure for the front of the train is optimized and improved, thereby solving the drawbacks of the original rail vehicle driver's boarding door being set on the body structure.

[0004] To achieve the above-mentioned purpose, the present invention provides a novel high-strength front aluminum structure, which is welded by a frame and a skin, and is characterized in that: an integral door frame is welded to the front side wall frame near the driver's cab side, and the integral door frame is divided into four parts: an upper door frame, a lower door frame and a left and right door frame. The four parts are connected by welding, and the upper and lower door frames are both high-strength aluminum alloy plates with bent ends to ensure the strength of the connection between the integral door frame and the side wall frame. The bottom connecting area of ​​the lower door frame is processed into a beam-column form and welded to the chassis to ensure the matching of the existing vehicle during welding. The left and right door frames are provided with oblong holes and welded to the side walls to ensure that when the side walls are connected to the side wall beams and columns, there is no opaque weld due to the excessive thickness of the door frame. The upper door frame has a welding groove and is welded to the original ridge skin at the top. At the same time, the upper door frame is welded to the side wall beams and columns to ensure the overall strength of the side wall.

[0005] Furthermore, the upper and lower door frames are on the same curve as the aluminum profile beams arranged along the vehicle length in the side wall frame, which connects the beams on both sides, transfers the load, is conducive to the conduction and distribution of energy, avoids stress concentration, and ensures the strength of the front structure.

[0006] Furthermore, among the left and right door frames, the right door frame is wider than the left door frame, and when subjected to load, it plays the role of bearing the entire door frame and continues to transfer the load backward.

[0007] Furthermore, the welds of the four door frames, upper, lower, left and right, are staggered with the aluminum profile beams and columns arranged along the vehicle length in the side wall frame to avoid stress concentration and reduce strength.

[0008] The present invention has the following advantages:

[0009] 1. Unlike the door frame structure on the existing vehicle body, the door frame of the present invention is made of high-strength aluminum alloy plates welded together, which has high strength. When welded to the side wall, the crossbeams of the upper and lower door frames are used to connect the original beams and columns, retaining the original arrangement of the beams and columns as much as possible, so that the load transfer method is similar to that of the original structure. Therefore, although the door frame is added to the side wall, it can still ensure that the vehicle body strength meets the requirements of relevant standards.

[0010] 2. The door frame design of this invention is positioned where the front curve of the vehicle is relatively smooth. A slot is created at the weld between the top of the door frame and the skin, preserving the original skin ridges. This not only ensures the door's clear width and height, but also ensures easy installation, allowing the door to conform to the vehicle's front curve without requiring excessive adjustments. This ensures both aesthetics and functionality. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is an axonometric view of a high-strength aluminum front structure with door frames;

[0012] Figure 2 Schematic diagram of the overall door frame structure;

[0013] Figure 3 This is a schematic diagram of the welding interface between the lower door frame and the base frame;

[0014] Figure 4 This is a schematic diagram of the interface between the left and right door frames and the side wall beams;

[0015] Figure 5 This is a schematic diagram of the upper door frame and the top interface;

[0016] Figure 6 Schematic diagram of the force transmission route of the side wall;

[0017] Figure 7 Schematic diagram of the supporting force of the entire door frame on the beams and columns on both sides. DETAILED DESCRIPTION

[0018] In the present invention, the train travels forward, so the left side of the front aluminum structure is the front and the right side is the rear.

[0019] Reference Figure 1 、 Figure 2The boarding door frame of the present invention is machined and manufactured using a high-strength aluminum alloy plate. The door frame is divided into four parts: an upper door frame 1, a lower door frame 3, a left door frame 6, and a right door frame 4. The parts are connected by welding. After welding, the door frame is processed again as a whole to ensure accuracy. Finally, it is welded to the front side wall frame as a whole to complete the assembly. The upper and lower door frames are both high-strength aluminum alloy plates with bent ends. The upper and lower door frames are connected to the beams on both sides by welding, and are welded to the left and right door frames at the same time. By adopting the bending form, the two welds will not gather at the two ends of the upper and lower door frames, avoiding stress concentration in the same part, and ensuring the strength of the structure. In order to ensure that they follow the shape of the front of the vehicle, the upper and lower door frames have curved shapes in both the length and width of the vehicle. By adopting a bending structure, the welds between the upper and lower door frames and the left and right door frames can be arranged on the approximately vertical left and right door frames, avoiding the welds from bearing stress in both the length and width of the vehicle at the same time, thereby improving the strength of the door frames. The left and right door frames of the boarding door are made of 120mm and 200mm wide high-strength aluminum alloy plates respectively. When the side wall aluminum profile beams transfer the load to the 120mm wide left door frame, the high-strength aluminum alloy plate has sufficient strength to withstand the load and transfer it to the rear right door frame through the upper and lower door frames. The rear right door frame uses a 200mm wide high-strength aluminum alloy plate. The aluminum alloy plate with a larger width can bear the entire door frame when subjected to load and continue to transfer the load to the rear.

[0020] Reference Figure 3 、 Figure 4 、 Figure 5 When the entire door frame is welded to the chassis, the bottom connection area of ​​the lower door frame 3 is processed into a beam-column form to ensure the matching of the existing vehicle during welding. When the left and right door frames are welded to the side walls, an oblong hole 5 is added to the door frame to ensure that when the side wall is connected to the side wall beam column, there is no weld opacity due to the excessive thickness of the door frame. When welding the door frame to the top, retain the original ridge skin and weld it to the door frame. The door frame opens a welding groove, and at the same time, the upper door frame 1 is welded to the side wall beam column to ensure the overall side wall strength. Through the above scheme, the door frame as a whole is welded to the front side wall frame and assembled, which can ensure both strength and feasibility of actual operation.

[0021] Reference Figure 6 The upper and lower door frames are located on the same curved line indicated by arrows as the aluminum profile beams 7 and 8 running along the vehicle's length in the side wall frame, connecting the beams on both sides. Loads transmitted from one end are transferred rearward through the upper and lower door frames in the direction indicated by the arrows, facilitating energy transfer and distribution, avoiding stress concentration, and ensuring the strength of the front structure. The welds of the four door frames are staggered from the aluminum profile beams running along the vehicle's length in the side wall frame to avoid stress concentration and reduce strength.

[0022] Reference Figure 7The left and right door frames of the boarding door are made of thicker high-strength aluminum alloy plates, which connect the beams and columns on both sides with the door frame into one, supporting the beams and columns on both sides and ensuring that they will not be damaged when bearing the load transmitted by the beams and columns on both sides.

Claims

1. A high-strength aluminum structure for the front end of a railway vehicle, formed by welding a frame and a skin, characterized by: An integral door frame is welded to the side wall frame of the front vehicle near the driver's cab side. The integral door frame is divided into four parts: upper door frame, lower door frame and left and right door frames, and the four parts are connected by welding; the upper and lower door frames are both high-strength aluminum alloy plates with bent ends, and the upper and lower door frames are respectively on the same curve as the aluminum profile beams arranged along the length of the vehicle in the side wall frame, which play the role of connecting the beams on both sides, transferring load, which is beneficial to the conduction and distribution of energy, avoiding stress concentration, and ensuring the strength of the connection between the integral door frame and the side wall frame; the bottom connection area of ​​the lower door frame is processed into a beam form and welded to the chassis to ensure the current vehicle matching during welding; the left and right door frames are opened with oblong holes and welded to the side walls to ensure that when the side walls are connected to the side wall beams, there is no weld opaqueness due to the excessive thickness of the door frame; the upper door frame has a welding groove and is welded to the original ridge skin on the top, and at the same time the upper door frame is welded to the side wall beams to ensure the overall side wall strength; The right door frame is wider than the left door frame in the left and right door frames, and plays the role of supporting the entire door frame when subjected to load, and continues to transfer the load backward; The welds of the four door frames, upper, lower, left and right, are staggered with the aluminum profile beams and columns arranged along the vehicle length in the side wall frame to avoid stress concentration and reduce strength.

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