Subway train lower box welded through laser welding

Abstract

The utility model discloses a laser welding lower box for a subway train, which belongs to the technical field of rail train electrical engineering and comprises a bottom plate, a transverse vertical plate, a longitudinal vertical plate and a cover plate. A transverse wire binding rod and a longitudinal wire binding rod are fixed on the bottom plate; the transverse vertical plate and the longitudinal vertical plate are welded and fixed through laser welding, and the transverse vertical plate, the longitudinal vertical plate and the bottom plate are welded and fixed through laser welding to form a box body structure; a plurality of customized nuts are fixed at the top end of the transverse vertical plate, and grounding plates and grounding seats are arranged on the transverse vertical plate and the longitudinal vertical plate. Due to the integrated design, parts needing to be machined are reduced, and the production efficiency is improved; the welding speed can be increased by more than three times, the leveling time is saved, and the welding cost is reduced; and the welding seam is smooth and beautiful, and the metal size of the welding seam is small.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail train electrical engineering, in particular to an undercarriage box welded by laser welding for a subway train. Background Art

[0002] There is an undercarriage box at the bottom of the EMU for installing high-voltage electrical components. The strength, sealing and electrical clearance of this type of undercarriage box are extremely demanding. At present, most solutions use argon arc welding, which has a large deformation after welding, requires a lot of time for leveling, and has high technical requirements. Operating argon arc welding requires professional skills and experience, and the operation is difficult. The current density is high and the light emission is strong. It will produce more serious ultraviolet radiation than ordinary arc welding. At the same time, the ozone generated by welding is higher, which is more harmful to the operator's health. The heat-affected zone is large, and the operation often leads to defects such as cracking, undercutting, excessive hardness, local annealing, and internal stress damage. Especially when welding small workpieces, the problem is more likely to be prominent.

[0003] Therefore, a new technical solution is urgently needed in the prior art to solve this problem. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a car undercarriage box welded by laser welding for subway trains, which is used to solve the problems of large deformation after welding and great difficulty in operation.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a laser-welded undercarriage box for subway trains, comprising a bottom plate, a transverse vertical plate, a longitudinal vertical plate and a cover plate; a transverse wire tie rod and a longitudinal wire tie rod are fixed on the bottom plate; the transverse vertical plates and the longitudinal vertical plates are fixed by laser welding, and the transverse vertical plates and the longitudinal vertical plates are fixed to the bottom plate by laser welding to form a box structure; a plurality of customized nuts are fixed on the top of the transverse vertical plates, and the transverse vertical plates and the longitudinal vertical plates are both provided with grounding plates and grounding sockets.

[0006] Preferably, the custom nut is fixed to the top end of the transverse vertical plate by welding.

[0007] Preferably, the grounding plate and the grounding seat are fixed to the horizontal vertical plate and the vertical vertical plate by welding.

[0008] Preferably, the transverse tie rod and the longitudinal tie rod are fixed to the bottom plate by welding.

[0009] Preferably, the cover plate is fixed by bolts and custom nuts at the top ends of the transverse vertical plates.

[0010] Preferably, the bottom plate is integrally formed with one of the transverse vertical plates and the longitudinal vertical plate by sheet metal rolling and bending.

[0011] Through the above design scheme, the utility model can bring the following beneficial effects:

[0012] 1. Integrated design reduces the number of parts to be processed and improves production efficiency;

[0013] 2. The welding speed can be increased by more than 3 times, saving leveling time and reducing welding costs;

[0014] 3. The weld strength is improved, the weld is smooth and beautiful, and the weld metal volume is small;

[0015] 4. Welding is quick and convenient, suitable for parts with high appearance requirements. It does not require professional skills and experience, has a short training time, and is easy to operate;

[0016] 5. Low harm to operators, no arc and large amounts of harmful gases are generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic diagram of the interior of a subway train undercarriage box welded by laser welding.

[0018] Figure 2 The utility model is an external schematic diagram of an undercarriage box welded by laser welding for a subway train.

[0019] Figure 3 The utility model is a schematic diagram of a cover plate of an undercarriage box of a subway train welded by laser welding.

[0020] In the figure, 1-bottom plate, 2-horizontal vertical plate, 3-longitudinal vertical plate, 4-cover plate, 5-horizontal wire tie rod, 6-longitudinal wire tie rod, 7-customized nut, 8-grounding plate, 9-grounding socket. DETAILED DESCRIPTION

[0021] The following is a detailed description of the specific implementation of the utility model in conjunction with the accompanying drawings.

[0022] It should be noted that the terms "front and back, up and down, left and right" and the like described in the text are merely simplified expressions based on the accompanying drawings for the purpose of intuitively describing the positional relationship, and are not limitations of the technical solution.

[0023] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with the preferred embodiments. It should be understood by those skilled in the art. The content described in detail below is illustrative rather than restrictive, and the user may make various changes to the following parameters without departing from the inventive mechanism and scope set forth in the claims. In order to avoid confusing the essence of the present invention, known methods and processes are not described in detail.

[0024] By the attached Figures 1 to 3As shown: a laser-welded undercarriage box for a subway train comprises a bottom plate 1, a transverse vertical plate 2, a longitudinal vertical plate 3 and a cover plate 4; a transverse wire tie rod 5 and a longitudinal wire tie rod 6 are fixed on the bottom plate 1; the transverse vertical plate 2 and the longitudinal vertical plate 3 are fixed by laser welding, and the transverse vertical plate 2 and the longitudinal vertical plate 3 are fixed to the bottom plate 1 by laser welding to form a box structure; a plurality of customized nuts 7 are fixed on the top of the transverse vertical plate 2, and a grounding plate 8 and a grounding seat 9 are provided on the transverse vertical plate 2 and the longitudinal vertical plate 3.

[0025] Furthermore, the customized nut 7 is fixed to the top end of the horizontal vertical plate 2 by welding.

[0026] Furthermore, the grounding plate 8 and the grounding seat 9 are fixed on the horizontal vertical plate 2 and the longitudinal vertical plate 3 by welding.

[0027] Furthermore, the transverse tie rod 5 and the longitudinal tie rod 6 are fixed on the base plate 1 by welding.

[0028] Further, the cover plate 4 is fixed by bolts and custom nuts 7 at the top ends of the transverse vertical plates 2 .

[0029] In order to facilitate positioning, the bottom plate 1 is integrally formed with one of the transverse vertical plates 2 and the longitudinal vertical plates 3 by sheet metal rolling and bending, and then the other transverse vertical plates 2 and longitudinal vertical plates 3 are welded.

[0030] In the specific implementation, the dimensions and parts positions are designed in three dimensions, and then processed by converting them into two-dimensional drawings: first, the required positions of the horizontal vertical plate 2 and the vertical vertical plate 3 are fixed by welding points; second, the horizontal vertical plate 2 and the vertical vertical plate 3 are fully welded with laser welding at the joint positions with the bottom plate 1; other small parts are welded, such as the customized nut 7 is fixed on the top of the horizontal vertical plate 2 by welding, the grounding plate 8 and the grounding seat 9 are fixed on the horizontal vertical plate 2 and the vertical vertical plate 3 by welding, the grounding plate 8 is used to prompt the grounding, and the grounding seat 9 is used to connect the door panel and the car body respectively; the horizontal wire tie rod 5 and the vertical wire tie rod 6 are fixed on the bottom plate 1 by welding, and the horizontal wire tie rod 5 and the vertical wire tie rod 6 are used to fix the wiring; the welding can be argon arc welding or laser welding; after all parts are welded, the dimensions are checked according to the drawings to see if they meet the tolerance requirements. Finally, the cover plate 4 is fixed by bolts and the customized nut 7 on the top of the horizontal vertical plate 2.

[0031] The utility model meets the IP65 grade requirement, has strict sealing, and the welds are beautiful after welding, and do not need to be smoothed; after the product impact and vibration test, no crack defects were found, which meets the requirements; after the rain test, no water leakage was found at the welds, which meets the requirements.

[0032] Obviously, the above-described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A laser-welded undercarriage box for a subway train, characterized in that: The invention comprises a bottom plate (1), a transverse vertical plate (2), a longitudinal vertical plate (3) and a cover plate (4); a transverse wire tie rod (5) and a longitudinal wire tie rod (6) are fixed on the bottom plate (1); the transverse vertical plate (2) and the longitudinal vertical plate (3) are fixed by laser welding, and the transverse vertical plate (2) and the longitudinal vertical plate (3) are fixed to the bottom plate (1) by laser welding to form a box structure; a plurality of customized nuts (7) are fixed on the top of the transverse vertical plate (2), and a grounding plate (8) and a grounding seat (9) are provided on the transverse vertical plate (2) and the longitudinal vertical plate (3).

2. According to claim 1, a laser-welded undercarriage box for a subway train is characterized in that: The custom nut (7) is fixed to the top end of the transverse vertical plate (2) by welding.

3. According to claim 1, a laser-welded undercarriage box for a subway train is characterized in that: The grounding plate (8) and the grounding seat (9) are fixed on the transverse vertical plate (2) and the longitudinal vertical plate (3) by welding.

4. According to claim 1, a laser-welded undercarriage box for a subway train is characterized in that: The transverse wire-binding rod (5) and the longitudinal wire-binding rod (6) are fixed on the bottom plate (1) by welding.

5. According to claim 1, a laser-welded undercarriage box for a subway train is characterized in that: The cover plate (4) is fixed by bolts and custom nuts (7) at the top of the transverse vertical plate (2).

6. According to claim 1, a laser-welded undercarriage box for a subway train is characterized in that: The bottom plate (1) is integrally formed with one of the transverse vertical plates (2) and the longitudinal vertical plate (3) by means of sheet metal rolling and bending.

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