Assembly welding structure rotating arm node seat for urban railway vehicle

Abstract

The utility model provides an assembly welding structure rotating arm node seat for an urban railway vehicle, which comprises a rotating arm node seat main body, the rotating arm node seat main body adopts a split type design and comprises a first rotating arm supporting part and a second rotating arm supporting part, and the welding end parts of the first rotating arm supporting part and the second rotating arm supporting part are slope surfaces; the assembly welding structure adopts a split type design and comprises a first arc-shaped connecting plate and a second arc-shaped connecting plate, and the welding end parts of the first arc-shaped connecting plate and the second arc-shaped connecting plate are slope surfaces; wherein the first arc-shaped connecting plate and the second arc-shaped connecting plate can be assembled to be combined with the first rotating arm supporting part and the second rotating arm supporting part to form an oval welding bottom face, and four V-shaped grooves are formed in the combined seam. The split welding device has the advantages that the split design is adopted, the oval welding bottom face formed after welding and assembling is used for dispersing stress at the welding seam, casting is more convenient compared with the overall design, and the quality and the yield of castings can be improved.

Description

Technical Field

[0001] The utility model relates to the field of railway vehicle steering brackets, in particular to a welded structure rotating arm node seat for urban railway vehicles. Background Art

[0002] With the development of urban rail transit, the axle weight of Type A subway vehicles has gradually increased from 16 tons to 17 tons. This increase in axle weight has forced the strength of some bogie components to fail to meet the 17-ton axle load requirement. Specifically, the welds at the ends of the traditional connection between the boom node and the lower cover of the frame side beam are primary stress concentration points. While this structure meets the strength requirements at a 16-ton axle load, at a 17-ton axle load, the maximum utilization factor of the welds at these ends reaches 2.3 under fatigue conditions (exceeding the requirement of Standard 1), failing to meet the strength requirements. Utility Model Content

[0003] In order to disperse the stress at the weld to reduce the maximum utilization rate of the weld under fatigue conditions, the utility model proposes a welded structure arm node seat for urban railway vehicles, including: an arm node seat body, the arm node seat body adopts a split design, including a first arm support part and a second arm support part, and the welding ends of the first arm support part and the second arm support part are sloped surfaces; a welded structure, the welded structure adopts a split design, including a first arc-shaped connecting plate and a second arc-shaped connecting plate, and the welding ends of the first arc-shaped connecting plate and the second arc-shaped connecting plate are sloped surfaces; wherein, the first arc-shaped connecting plate and the second arc-shaped connecting plate can be assembled with the first arm support part and the second arm support part to form an elliptical welding bottom surface, and 4 V-shaped grooves are formed at the combined joint.

[0004] In one or more embodiments, the first pivot arm support portion and the second pivot arm support portion both include: a C-shaped support arm and a welding bottom surface; wherein the welding bottom surface is tangent to the C-shaped support arm and connected in an arc, and forms a first unloading arc on the side away from the C-shaped opening, and a second unloading arc on the side close to the C-shaped opening; the welding bottom surface is a plane, and the perpendicular line of the plane has a first angle with the direction of the C-shaped opening.

[0005] In one or more embodiments, the end section of the C-shaped support arm is convex, and the welding bottom surface is tangent to the convex surface of the convex shape and is connected in an arc.

[0006] In one or more embodiments, the minimum side distance between the first pivot arm support portion and the second pivot arm support portion is 145 mm.

[0007] In one or more embodiments, both end sections of the C-shaped opening are planes, and threaded slots are respectively provided at the centers of the two end sections.

[0008] In one or more embodiments, the welded structure arm node seat for urban rail vehicles of the utility model also includes: a block, wherein a first through hole and a second through hole are respectively provided at both ends of the block, and the block is detachably connected to the two end face section bolts of the C-shaped opening to seal the C-shaped opening.

[0009] In one or more embodiments, the arc radius of the first unloading arc is greater than the arc radius of the second unloading arc.

[0010] In one or more embodiments, the first arc-shaped connecting plate and the second arc-shaped connecting plate each include: a first parallel connecting plate, a second parallel connecting plate, and a third vertical connecting plate; wherein, one end of the first parallel connecting plate and the second parallel connecting plate are respectively connected to one end of the third vertical connecting plate in an arc shape, and the first parallel connecting plate and the second parallel connecting plate are arranged in parallel; the other ends of the first parallel connecting plate and the second parallel connecting plate are free slope surfaces.

[0011] In one or more embodiments, the arc radius at the connection between the first parallel connecting plate or the second parallel connecting plate and the third vertical connecting plate is 20±0.5 mm, and the wall thickness is 20±0.5 mm.

[0012] In one or more embodiments, the first parallel connecting plate is 336±3 mm away from the second parallel connecting plate.

[0013] The beneficial effects of the present invention include: the welded structure arm node seat for urban rail vehicles of the present invention adopts a split design, and after welding and assembly, an elliptical welding bottom surface will be formed to disperse the stress at the weld, and it is more convenient to cast than the overall design, which helps to improve the quality and yield of castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a structural diagram of a welded structure pivot arm node seat for urban railway vehicles according to an embodiment of the present utility model;

[0016] Figure 2 This is a schematic structural diagram of the rotating arm support portion of an embodiment of the present utility model;

[0017] Figure 3This is a schematic diagram of the use state of the welding structure arm node seat for urban railway vehicles according to an embodiment of the utility model;

[0018] Figure 4 This is a bottom view of the structural diagram of the welded structure pivot arm node seat for urban railway vehicles according to an embodiment of the present utility model;

[0019] Figure 5 This is a side view structural diagram of the assembly of the boom node seat body and the boom node according to an embodiment of the present utility model.

[0020] The meanings of the reference numerals in the above drawings are as follows:

[0021] The pivot arm node seat body 100, C-shaped support arm 101, welding bottom surface 102, first unloading arc 103, second unloading arc 104, first pivot arm support portion 110, second pivot arm support portion 120, assembly welding structure 200, first parallel connecting plate 201, second parallel connecting plate 202, third vertical connecting plate 203, first arc connecting plate 210, second arc connecting plate 220, and stopper 300;

[0022] Swing arm node seat 1, swing arm node 2, vehicle side beam lower cover 3. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0024] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0025] In order to disperse the stress at the weld to reduce the maximum utilization rate of the weld under fatigue conditions, in one embodiment, the utility model proposes a welded structure arm node seat for urban railway vehicles, see Figure 1, including: a swing arm node seat body 100, the swing arm node seat body 100 adopts a split design, including a first swing arm support part 110 and a second swing arm support part 120, and the welding ends of the first swing arm support part 110 and the second swing arm support part 120 are sloped surfaces; a welding structure 200, the welding structure 200 adopts a split design, including a first arc-shaped connecting plate 210 and a second arc-shaped connecting plate 220, and the welding ends of the first arc-shaped connecting plate 210 and the second arc-shaped connecting plate 220 are sloped surfaces; wherein, the first arc-shaped connecting plate 210 and the second arc-shaped connecting plate 220 can be assembled with the first swing arm support part 110 and the second swing arm support part 120 to form an elliptical welding bottom surface, and form 4 V-shaped grooves at the combined joint.

[0026] Specifically, this embodiment splits the boom node seat into four parts, which can be assembled by welding to form a complete boom node seat when used, and by adding a first arc-shaped connecting plate 210 and a second arc-shaped connecting plate 220 to the welding ends of the first boom support part 110 and the second boom support part 120 respectively, so that they can be welded to form an elliptical welding bottom surface, thereby achieving the purpose of increasing the weld length and dispersing stress; in addition, the four parts after splitting are easier to cast than the overall boom node seat, which helps to improve the quality and yield of castings.

[0027] In one embodiment, see Figure 2 The first rotating arm support part 110 and the second rotating arm support part 120 both include: a C-shaped support arm 101 and a welding bottom surface 102; wherein, the welding bottom surface 102 is arranged tangent to the C-shaped support arm 101 and is connected in an arc, and forms a first unloading arc 103 on the side away from the C-shaped opening, and forms a second unloading arc 104 on the side close to the C-shaped opening; the welding bottom surface 102 is a plane, and its plane perpendicular has a first angle with the direction of the C-shaped opening.

[0028] For details, see Figure 3 The pivot arm node seat 1 is generally arranged at the oblique beam of the lower cover plate 3 of the vehicle side beam so that the pivot arm node seat can bear the forces in the vertical, longitudinal and transverse directions transmitted by the C-shaped support arm 101, thereby dispersing the stress; and in order to ensure that the C-shaped opening of the C-shaped support arm 101 is vertically downward after welding, so that the C-shaped support arm 101 is clamped on the pivot arm node 2, it is necessary to weld the bottom surface 102 to be tangent to the C-shaped support arm 101 and have an angle, wherein the pivot arm node seat 1 and the pivot arm node 2 are detachably fixedly connected by the block 300.

[0029] More specifically, tests have shown that the boom node seat of this embodiment can transfer the maximum stress to the unloading arcs 103 and 104, while reducing the maximum utilization rate of the weld under fatigue conditions to 0.94, and the maximum static strength stress value at the unloading arcs 103 and 104 is approximately 262.73 MPa.

[0030] Optionally, the elliptical welding bottom surface formed by the pivot arm node seat of this embodiment is Figure 3 The wall thickness of the welding interface of the lower cover plate of the middle frame is 25±0.5mm.

[0031] In further embodiments, see Figure 4 The end section of the C-shaped support arm 101 is convex, and the welding bottom surface is tangent to the convex surface of the convex shape and connected with the arc. Specifically, the convex multi-corrugated structure in this embodiment helps to increase the torsional resistance of the support arm and can increase the Figure 3 The contact area of ​​the middle stopper increases the surface friction to ensure the tightness between the two.

[0032] In further embodiments, see Figure 2 The arc radius of the first unloading arc 103 is greater than the arc radius of the second unloading arc 104 to evenly disperse the stress. Optionally, the arc radius of the first unloading arc 103 is 20±0.5mm, and the arc radius of the second unloading arc is 10±0.5mm.

[0033] For further examples, please see Figure 4 , both end sections of the C-shaped opening are flat, and threaded slots 105 are provided at the centers of the two end sections; correspondingly, see Figure 3 The utility model also includes a stopper 300, with a first through hole and a second through hole at both ends of the stopper 300. The stopper 300 is detachably connected to the two end surface sections of the C-shaped opening with bolts to block the C-shaped opening. The assembly side view of the arm node seat body 100 and the arm node 2 is shown in FIG. Figure 5 shown.

[0034] In one embodiment, see Figure 1 or Figure 4 The first curved connecting plate 210 and the second curved connecting plate 220 each include: a first parallel connecting plate 201, a second parallel connecting plate 202, and a third vertical connecting plate 203; wherein one end of the first parallel connecting plate 201 and the second parallel connecting plate 202 are respectively connected to one end of the third vertical connecting plate 203 by an arc, and the first parallel connecting plate 201 and the second parallel connecting plate 202 are arranged in parallel; the other ends of the first parallel connecting plate 201 and the second parallel connecting plate 202 are free sloped surfaces. Optionally, the angle of the free slope is greater than or equal to 60° and less than or equal to 75°, so as to form a groove with an angle between 50° and 60° with the slope of the welding end of the first rotating arm support portion 110 and the second rotating arm support portion 120, thereby facilitating the insertion of the welding rod into the groove for welding and ensuring welding strength.

[0035] Optionally, the arc radius at the connection between the first parallel connecting plate 201 or the second parallel connecting plate 202 and the third vertical connecting plate 203 is 20 mm ± 0.5, and the wall thickness is 20 mm ± 0.5; the first parallel connecting plate 201 and the second parallel connecting plate 202 are 336 ± 3 mm apart. The arc radius at the connection between the first parallel connecting plate 201 or the second parallel connecting plate 202 and the third vertical connecting plate 203 is used to avoid stress concentration.

[0036] The above are exemplary embodiments disclosed herein, but it should be noted that various changes and modifications may be made without departing from the scope of the present invention as defined in the claims. The functions, steps, and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order.

[0037] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to limit the scope of the disclosure of the present invention (including the claims) to these examples. Based on the principles of the present invention, the technical features of the above embodiments or different embodiments may be combined, and there are many other variations of the various aspects of the above embodiments, which are not provided in detail for the sake of clarity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A welded structure arm node seat for urban railway vehicles, characterized in that: include: The main body of the pivot arm node seat adopts a split design, including a first pivot arm support portion and a second pivot arm support portion, and the welding ends of the first pivot arm support portion and the second pivot arm support portion are sloped; The group welding structure adopts a split design and includes a first arc-shaped connecting plate and a second arc-shaped connecting plate, wherein the welding ends of the first arc-shaped connecting plate and the second arc-shaped connecting plate are sloped surfaces; The first arc-shaped connecting plate and the second arc-shaped connecting plate can be assembled with the first rotating arm support portion and the second rotating arm support portion to form an elliptical welding bottom surface, and four V-shaped grooves are formed at the combined joint.

2. The welded structure arm node seat for urban railway vehicles according to claim 1, characterized in that: The first rotating arm supporting portion and the second rotating arm supporting portion both include: C-shaped support arm and welded bottom surface; The welding bottom surface is tangent to the C-shaped support arm and connected in an arc, and forms a first unloading arc on the side away from the C-shaped opening, and a second unloading arc on the side close to the C-shaped opening; The welding bottom surface is a plane, and a perpendicular line of the plane forms a first angle with the direction of the C-shaped opening.

3. The welded structure arm node seat for urban railway vehicles according to claim 2, characterized in that: The end section of the C-shaped support arm is convex, and the welding bottom surface is tangent to the convex surface of the convex shape and is connected in an arc.

4. The welded structure arm node seat for urban railway vehicles according to claim 3, characterized in that: The minimum side distance between the first rotating arm support portion and the second rotating arm support portion is 145 mm.

5. The welded structure arm node seat for urban railway vehicles according to claim 2, characterized in that: Both end sections of the C-shaped opening are planes, and threaded slots are respectively provided at the centers of the two end sections.

6. The welded structure arm node seat for urban railway vehicles according to claim 5, characterized in that: Also includes: A stopper is provided with a first through hole and a second through hole at both ends of the stopper, and the stopper is detachably connected to two end surface section bolts of the C-shaped opening to block the C-shaped opening.

7. The welded structure arm node seat for urban railway vehicles according to claim 2, characterized in that: The arc radius of the first unloading arc is greater than the arc radius of the second unloading arc.

8. The welded structure arm node seat for urban railway vehicles according to claim 1, characterized in that: The first arc-shaped connecting plate and the second arc-shaped connecting plate each include: a first parallel connecting plate, a second parallel connecting plate, and a third vertical connecting plate; Wherein, one end of the first parallel connecting plate and one end of the second parallel connecting plate are respectively connected to one end of the third vertical connecting plate in an arc shape, and the first parallel connecting plate and the second parallel connecting plate are arranged in parallel; The other ends of the first parallel connecting plate and the second parallel connecting plate are free slope surfaces.

9. The welded structure arm node seat for urban railway vehicles according to claim 8, characterized in that: The arc radius at the connection between the first parallel connecting plate or the second parallel connecting plate and the third vertical connecting plate is 20±0.5 mm, and the wall thickness is 20±0.5 mm.

10. The welded structure arm node seat for urban railway vehicles according to claim 8, characterized in that: The first parallel connecting plate is 336±3 mm away from the second parallel connecting plate.

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