Automatic welding equipment for metro brake hanging seat

Abstract

The utility model discloses automatic welding equipment for a subway brake hanging seat, which comprises a first welding device used for welding a circumferential weld between a brake hanging seat vertical plate and a brake pipe and a fillet weld between a rib plate and the vertical plate and between the rib plate and the brake pipe; comprising a double-shaft position changing machine, a welding robot and a brake hanging seat welding tool, the brake hanging seat welding tool is arranged on the double-shaft position changing machine, and the brake hanging seat welding tool comprises a left part movable limiting device, a right part movable limiting device, a three-jaw chuck, a left part sliding groove, a right part sliding groove, a sliding groove stop block and a movable positioning block; a cavity is formed in the center of the three-jaw chuck and used for pre-clamping or fastening a brake pipe of the brake hanging seat. According to the utility model, a solution is found for the inevitable contour deviation problem of the vertical plate of the brake hanging seat; welding personnel are reduced, and the working intensity is reduced; the product welding efficiency is improved; and grinding consumables are saved, and the working environment is improved.

Description

Technical Field

[0001] This utility model belongs to the field of assembly and welding technology of the braking part of the rail vehicle bogie. The welded brake hanger is a high-stress, high-load-bearing, core component of the bogie product; specifically, it relates to an automated welding equipment for subway brake hangers. Background Technology

[0002] The brake hanger is used in the PW120E metro bogie and is a key component of the bogie's braking assembly, connecting the braking assembly to the bogie. The structure of the brake hanger is as follows: Figure 1 As shown.

[0003] For welding brake hangers, existing technologies are divided into: ① manual assembly and welding mode; ② automated assembly and welding mode (Chinese Patent ZL2019113064771).

[0004] ① Manual assembly and welding mode: Under the current manual technology conditions, it is difficult to guarantee the relative position of the brake hanger upright plate. Due to the error of manual assembly, the product is often unqualified and a lot of rework is required. In addition, the assembly position of the brake hanger stiffener plate is a spatial dimension. Manual template marking assembly is difficult to meet its assembly accuracy. Therefore, the inaccuracy of the stiffener plate position will affect the stress of the component, affect the service life of the product, and pose certain safety hazards. The brake hanger is divided into left and right parts. Manual assembly sometimes reverses the left and right parts, resulting in product scrap, wasting product materials and increasing production costs.

[0005] ②Automated assembly and welding mode (Chinese Patent ZL2019113064771): All components and welds can be assembled and welded in a fully automated manner. However, after several years of batch welding use, it has been found that the brake hanger upright plate component has inconsistent contours due to the aging of the forging die and the uncertainty of the material forging springback. This is very common and there is no discernible pattern. Consequently, when machining holes, the holes cannot be completely aligned with the machined surface at 79.73°. Figure 2This results in inconsistent angles between the brake hanger support plate and the brake pipe after assembly, with uneven and irregular angle distribution. However, the position and angle of the welding torch in fully automated welding are determined by the teaching process and cannot automatically adjust to changes in the product. Furthermore, the high welding speed, even with the addition of relevant sensors (such as vision sensors and laser angle sensors), cannot achieve timely adjustment of the welding torch angle. Therefore, after welding, problems such as undercut (small angle) on the brake hanger support plate and asymmetrical weld legs (large angle) occur. Welding defects increase the amount of post-weld repair work. Although automated welding improves the welding efficiency, the increased repair volume makes the production efficiency equal to or lower than manual welding (when every product requires repair). Simultaneously, deviations in the plate's outline can also cause excessive gaps between the brake hanger support rib and the brake hanger support plate (see...). Figure 3 This, in turn, affects the automated welding of the fillet weld between the brake mount stiffener and the brake mount upright plate. When using this existing patent for welding, the brake mount upright plate and the assembly of the brake mount stiffener and brake pipe are affected by the outline of the brake mount upright plate.

[0006] Therefore, in order to improve the above problems, it is necessary to optimize the fully automatic welding method of the brake hanger based on the problems that have been found. Summary of the Invention

[0007] In view of the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide an automated welding equipment for subway brake brackets.

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0009] An automated welding equipment for subway brake hangers includes a first welding device for welding the circumferential weld between the brake hanger upright plate and the brake pipe, and the fillet weld between the stiffening plate and the upright plate and the brake pipe. The first welding device includes a dual-axis positioner, a welding robot, and a brake hanger welding fixture. The brake hanger welding fixture is mounted on the dual-axis positioner and includes a left-part movement limiter, a right-part movement limiter, a three-jaw chuck, a left-part slide groove, a right-part slide groove, a slide groove stop, and a movement positioning device. The three-jaw chuck has a cavity in the center for pre-clamping or securing the brake pipe of the brake hanger; one side of the three-jaw chuck has opposing left and right slide grooves, and the inner ends of the left and right slide grooves are fixed with slide groove blocks for sliding limit; the left and right slide grooves are respectively slidably erected with left and right movable limiters, and the upper ends of the left and right movable limiters are provided with movable positioning blocks, which are in contact with the upright plate of the brake hanger for positioning.

[0010] Furthermore, the left and right movable limiters can be withdrawn from the outer ends of the left and right slide grooves, respectively.

[0011] Furthermore, the left component slide groove and the right component slide groove are arranged adjacent to each other.

[0012] Furthermore, the sliding directions of the left and right movable limiters are exactly opposite.

[0013] Furthermore, the movable positioning block is matched and limited at the head end of the vertical plate of the brake hanger.

[0014] Furthermore, the welding equipment also includes a second welding device for assembling and welding the sealing plate of the brake hanger to the brake pipe; the second welding device includes the following welding area: the two ends of the brake pipe are provided with brake pipe assembly limits, and the outer sides of the two ends of the brake pipe are provided with sealing plate clamping parts. The sealing plate clamping parts can fix the sealing plate by the material of their own electromagnetic components, and the sealing plate is sent into the brake pipe for tack fixing and then withdrawn by the movement of the cylinder.

[0015] Furthermore, the second welding device is described in Chinese Patent ZL2019113064771.

[0016] The main advantages of this utility model are as follows:

[0017] (1) The equipment of this utility model can meet the fully automatic welding of subway gantry. The brake gantry welding fixture H of the first welding device is designed to meet the fully automated welding. In order to achieve fully automated welding, it is necessary to use a fixture with positioning function so that different workpieces are assembled on the fixture in the same position, thus ensuring that fully automated welding can proceed smoothly.

[0018] Furthermore, this utility model can improve the problem of insufficient assembly precision of product components, especially the assembly parts of the brake hanger plate B and the brake hanger rib plate A with the brake pipe C, which are no longer affected by the contour of the brake hanger plate B.

[0019] (2) A solution was found to address the unavoidable contour deviation of the brake hanger upright plate.

[0020] Verification has shown that this automated welding equipment can effectively solve the welding defects caused by the deviation in the outline of the brake hanger upright plate, making automated welding production more stable. The welding defect rate per train (48 pieces) has decreased from 83.3% to 3%.

[0021] Table 1. Comparison of Welding Defect Rates Before and After Optimization of Automatic Welding Process for Brake Mounts

[0022]

[0023] (3) The number of people involved in welding is reduced, and the workload is lowered.

[0024] Before optimization, to ensure the output of finished products, one equipment operator and two welding and repair personnel were required. After process optimization, the number of welding and repair personnel was reduced by one, and the workload of the repair personnel was reduced by 82%.

[0025] Table 2. Comparison of the number of personnel involved in the welding process before and after the optimization of the automatic welding process for brake hangers.

[0026]

[0027] Table 3. Comparison of repair personnel workload before and after optimization of automatic welding process for brake hanger.

[0028]

[0029] (4) Improved product welding efficiency

[0030] Welding efficiency improved by 10%.

[0031] Table 4. Comparison of welding times for each weld before and after optimization of the automatic welding process for brake hanger.

[0032]

[0033] (5) Grinding consumables are saved and the working environment is improved.

[0034] After optimization, the weld seams are more consistent and have fewer welding defects, resulting in a reduction in subsequent weld seam grinding and a 70% saving in grinding consumables. In addition to saving grinding consumables, the reduction in grinding also reduces grinding dust generation, improving the working environment at the workstation.

[0035] Table 6. Comparison of grinding consumable consumption before and after optimization of automatic welding process for brake hanger.

[0036] . Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the brake hanger;

[0038] Figure 2 The angular relationship of the holes in the vertical plate;

[0039] Figure 3 This is a schematic diagram showing the gap between the stiffening slab and the vertical slab;

[0040] Figure 4 This is a schematic diagram of the fillet weld position;

[0041] Figure 5 This is a schematic diagram of the flat welding position;

[0042] Figure 6 This is a schematic diagram showing the width of the brake seat stiffener.

[0043] Figure 7 Illustration of existing patented welding equipment Figure 1 ;

[0044] Figure 8 Illustration of existing patented welding equipment Figure 2 ;

[0045] Figure 9 This is an existing patented head and tail frame positioner;

[0046] Figure 10 This is a top view of the welding equipment of this utility model;

[0047] Figure 11 This is a side view of the welding equipment of this utility model;

[0048] Figure 12 This is a side view of a dual-axis positioner.

[0049] Figure 13 To complete the welding of the brake pipe and the sealing plate on the existing patented tooling;

[0050] Figure 14 Enlarged view of the existing patented tooling sealing plate clamping component;

[0051] Figure 15 This is a schematic diagram of the rotating axes and rotation directions of a dual-axis positioner.

[0052] Figure 16 Schematic diagram of welding fixture for brake hanger;

[0053] Figure 17 Enlarged view of the welding fixture for the brake hanger (positional relationship between the movable positioning block and the brake hanger product);

[0054] Figure 18 A diagram illustrating the angle between the workpiece and the horizontal plane, and the posture adjustment. Figure 1 ;

[0055] Figure 19 Weld number Figure 1 ;

[0056] Figure 20 A schematic diagram showing the rotation direction of the rotating shaft 2 of the dual-axis positioner when welding the inner and outer 1-1 weld seams;

[0057] Figure 21 A diagram illustrating the angle between the workpiece and the horizontal plane, and the posture adjustment. Figure 2 ;

[0058] Figure 22 Weld number Figure 2 ;

[0059] Figure 23This is a schematic diagram showing the rotation direction of the rotating shaft 2 of the dual-axis positioner when welding the inner and outer weld seams 1-2.

[0060] Figure 24 A diagram illustrating the angle between the workpiece and the horizontal plane, and the posture adjustment. Figure 3 ;

[0061] Figure 25 This is a schematic diagram showing the adjustment of the stiffener posture of the brake hanger.

[0062] Figure 26 This is a schematic diagram showing the welding sequence of the stiffener plates for the brake hanger.

[0063] Figure 27 Flowchart for automated welding of brake hangers;

[0064] Among them, A-stiffening plate, B-vertical plate, C-brake pipe, D-sealing plate;

[0065] 11-Control cabinet, 12-Positioner, 13-Intermediate screen, 14-Start detection system, 15-Gun cleaning mechanism, 16-Safety fence, 17-Robot arm, 18-Welding wire holder, 19-Welding gun cooling system;

[0066] 411-Sealing plate clamping component; 411A-Cylinder pushes and tightens in the direction of assembling materials; 411B-Cylinder retracts and exits in the direction of sealing plate clamping component; 412-Brake pipe assembly limit.

[0067] E-Brake Hanger Product, E1-Brake Hanger Right Part;

[0068] F-Dual-axis positioner;

[0069] G-Welding Robot;

[0070] H - Brake hanger welding fixture, H1 - Left part movement limit, H2 - Right part movement limit, H3 - Three-jaw chuck, H4 - Left part slide groove, H5 - Right part slide groove, H6 - Slide groove stop block, H7 - Movable positioning block. Detailed Implementation

[0071] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0072] Example 1

[0073] The automated welding equipment for subway brake hangers in this embodiment includes two devices:

[0074] A device is configured according to existing patents (such as...) Figures 7 to 9As shown, it will not be repeated here. For details, please refer to paragraphs 78-79 of Chinese Patent ZL201911306477.1, which describes the assembly and welding of the brake hanger sealing plate D and the brake pipe C.

[0075] Based on process optimization, using the aforementioned existing patents will only require... Figure 13 The assembly and welding of the brake hanger plate D and brake pipe C is described above. The assembly of the remaining brake hanger upright plate B and brake hanger rib plate A with the brake pipe C is omitted due to the influence of the outline of the brake hanger upright plate B; instead of using the aforementioned existing patent, another piece of equipment is employed.

[0076] Another device, such as Figures 10 to 12 As shown, the welding work includes the circumferential weld between the brake hanger plate B and the brake pipe C, and the fillet weld between the brake hanger stiffener A and the brake hanger plate B and brake pipe C. This involves a dual-axis positioner F, a welding robot G, and a brake hanger welding fixture H. The L-type dual-axis positioner F, through two mutually perpendicular rotating axes, enables omnidirectional welding of the product. Figure 15 As shown; a brake hanger welding fixture H is installed on the dual-axis positioner F.

[0077] like Figure 16 and Figure 17 As shown, the brake hanger welding fixture H includes a left-part movable limiter H1, a right-part movable limiter H2, a three-jaw chuck H3, a left-part slide groove H4, a right-part slide groove H5, a slide groove stop block H6, and a movable positioning block H7. The three-jaw chuck H3 has a central cavity for pre-clamping or securing the brake hanger product E (specifically, pre-clamping or securing the brake pipe C); the three-jaw chuck H3 has opposing left-part slide grooves H4 and right-part slide grooves H5 on one side (these must be positioned relative to each other to accommodate welding of the left and right parts). Figure 17 This is to more intuitively distinguish the installation of left and right parts. Since the workpieces are assembled on the same side, production personnel do not need to work around the positioner. Left part movable limiters H1 and right part movable limiters H2 are respectively slidably erected on the left part slide H4 and right part slide H5. Slide stops H6 are fixedly installed at the inner ends of both left part slide H4 and right part slide H5 for sliding limitation. The sliding directions of left part movable limiters H1 and right part movable limiters H2 are exactly opposite, and they can be retracted from the left part slide H4 and right part slide H5 respectively. Movable positioning blocks H7 are provided at the upper ends of both left part movable limiters H1 and right part movable limiters H2. The end of the upright plate B of the brake hanger contacts the movable positioning block H7 to achieve positioning of the brake hanger product E.

[0078] Example 2

[0079] like Figure 27 As shown, the automated welding equipment for subway brake hangers according to Example 1 is used for the automated welding of brake hangers. The process is as follows:

[0080] (1) The sealing plate D of the brake hanger is assembled and welded to the brake pipe C, such as Figure 13 and Figure 14 As shown. This step will not be repeated here; for details, please refer to paragraphs 80-81 of Chinese Patent ZL201911306477.1. After assembling the brake hanger material according to the corresponding positions of the tooling, the operator leaves the operating area and clamps the workpiece using the buttons on the operating device. After clamping the workpiece, the operator starts the welding program using the teaching pendant. After the welding program starts, it will first perform tack welding on the assembled parts (tack welding parameters: current 230A, voltage 24V, pause time 1s). After the tack welding is completed, the robot will automatically weld the assembled parts. Complete the weld between the sealing plate D and the brake pipe C (welding parameters: current 245-255A, voltage 26-27V, welding speed 32-45cm / min). The clamping action of the tooling on each part is illustrated as follows. Figure 14 The sealing plate D is fixed by electromagnet adsorption, and the pushing and contracting motion of the clamping mechanism is completed by the extension and retraction motion of the cylinder.

[0081] (2) The brake seat stiffener plate A and the upright plate B are assembled manually.

[0082] In addition, brake hanger rib plates A of various widths are prepared and adapted during product assembly to ensure that the gap between brake hanger rib plate A and brake hanger upright plate B is controlled within 0-1mm. Brake hanger rib plate A widths of 2mm, 4mm, and 6mm are provided to accommodate product assembly with different welding gaps; width information is shown in the table below.

[0083] Table 5. Statistics on the Width Adjustment of Brake Hanger Seat Rib Plate

[0084]

[0085] (3) The vertical plate B of the brake hanger is welded to the brake pipe C by a circumferential weld, and the stiffening plate A is welded to the brake pipe C and the vertical plate B.

[0086] (3.1) Positioning and assembly of the brake hanger product E to be assembled and welded with the brake hanger welding fixture H:

[0087] The brake hanger product E, which was manually assembled in step (2) above, is hoisted onto the brake hanger welding H by a crane. The brake pipe C needs to be placed in the three-jaw chuck H3. The brake hanger product E is pre-clamped by manually rotating the chuck drive mechanism with a wrench (to ensure that the brake hanger product E is perpendicular to the tooling and can rotate freely between the movable chucks of the three-jaw chuck H3).

[0088] According to the type of brake hanger product E (brake hanger product E has left and right parts, and this embodiment takes the right part E1 of the brake hanger as an example), select the corresponding movable limit block. After the movable limit block moves in the groove on the tooling and abuts against the groove stop block H6, the movable positioning block H7 is installed in place. By rotating the brake hanger, the brake hanger upright plate B contacts the movable positioning block H7 to achieve product positioning.

[0089] After the product is positioned, the chuck drive mechanism is rotated again by wrench to fasten the brake hanger product E onto the three-jaw chuck H3. Then the movable limiter slides out of the groove to avoid interference between the welding torch and the movable limiter, which would affect the welding of the circumferential weld.

[0090] (3.2) Welding of the four inner and outer circumferential welds between the vertical plate B of the brake hanger and the brake pipe C:

[0091] After product positioning and assembly are completed, the operators leave the equipment assembly area. The teaching pendant initiates the welding program. Once the welding program starts, the rotating shaft 1 of the L-type dual-axis positioner F rotates counterclockwise by 45°, causing the brake hanger product E to form a 45° upward angle with the horizontal plane. Figure 18 As shown.

[0092] After flipping into position, the welding robot G, carrying the welding torch, moves to the welding starting point. Simultaneously, as the welding torch ignites an arc, the rotating shaft 2 of the L-shaped dual-axis positioner F rotates, initiating the welding of the circumferential weld between the brake support plate B and the brake pipe C. The weld seam welded in this posture is as follows: Figure 19 .

[0093] When welding the outer 1-1 weld (the first outer weld), the rotating shaft 2 of the L-type dual-axis positioner F rotates counterclockwise; when welding the inner 1-1 weld (the first inner weld), the rotating shaft 2 of the L-type dual-axis positioner F rotates clockwise. The rotation direction of the rotating shaft is as follows: Figure 20 As shown (because the servo motor cannot rotate indefinitely in a clockwise or counterclockwise direction, the servo motor of this device can only rotate 540° clockwise or counterclockwise. Therefore, after rotating 360° clockwise, it needs to rotate back counterclockwise. The rotation scheme of this patent allows the servo motor of the device to start rotating from its original position, which can save repositioning time and improve welding efficiency).

[0094] After the welding of the inner and outer numbered 1-1 welds is completed, the rotation axis 1 of the L-type dual-axis positioner F will be in the previous posture (the posture of the inner and outer numbered 1-1 welds, i.e.) Figure 18 Based on the above, continue to rotate counterclockwise by 90°, so that the brake hanger product E forms a 45° downward angle with the horizontal plane, see... Figure 21 .

[0095] After flipping into position, the welding robot G, carrying the welding torch, moves to the welding starting point. Simultaneously, the rotating shaft 2 of the L-shaped dual-axis positioner F rotates, initiating the welding of the remaining two circumferential welds between the brake support plate B and the brake pipe C. The weld seam welded in this posture is as follows: Figure 22 .

[0096] When welding the outer 1-2 weld seams (outer second weld seam), the rotating shaft 2 of the L-type dual-axis positioner F rotates counterclockwise; when welding the inner 1-2 weld seams (inner second weld seam), the rotating shaft 2 of the L-type dual-axis positioner F rotates clockwise. The rotation direction of the rotating shaft is as follows: Figure 23 .

[0097] The welding parameters for the inner and outer circumferential welds of the four brake hanger plates B and the brake pipe C are as follows: current 280-300A, voltage 30-32V, welding speed 18-30cm / min, welding torch oscillation amplitude 2-2.5mm, and welding torch oscillation frequency 1-1.5HZ.

[0098] The welding position of the circumferential weld between the brake mount plate B and the brake pipe C is optimized to compensate for the welding defects caused by the angular deviation between the brake mount plate B and the brake pipe C. The original technique used a fillet weld (see...). Figure 4 This refers to welding with the welding torch at a 40-50° angle to the horizontal plane. However, this invention will use a flat welding position (see...). Figure 5 This means welding is performed at an angle of 80-100° between the welding torch and the horizontal plane.

[0099] Although there are dimensional deviations between the upright plate B and the brake pipe C of each product, the deviations in the product material and the assembly deviations in the tooling are different (the product material deviation affects the product size, but the assembly deviations between the product and the tooling affect the start and end positions of the product welding process). Therefore, priority should be given to ensuring the assembly position of the product in the tooling to achieve fully automated welding. Then, the adverse effects of dimensional deviations between workpiece parts on the weld appearance can be compensated by changing the welding position of the workpiece. At the same time, in order to weld the product weld completely and minimize weld defects, the workpiece needs to be arranged according to... Figure 18 and Figure 21 Flip it in the form of .

[0100] Among them, the brake hanger welding fixture H is designed to meet the requirements of fully automated welding. To achieve fully automated welding, it is necessary to use fixtures with positioning functions, so that different workpieces are assembled in the same position on the fixture (reflected in the small deviation of the start and end points of the welding process), thus ensuring the smooth progress of fully automated welding.

[0101] (3.3) Welding of the stiffening plate A of the brake hanger with the vertical plate B and the brake pipe C:

[0102] After the welding of the inner and outer circumferential welds between the brake hanger plate B and the brake pipe C is completed, the rotating shaft 1 of the L-type dual-axis positioner F is in the previous posture (the posture of the inner and outer welds 1-2). Figure 21 Based on this, rotate 45° clockwise to bring the workpiece into a horizontal position.

[0103] The rotating shaft 2 of the L-type dual-axis positioner F is then rotated 50° clockwise to bring the brake seat rib plate A into a horizontal position. Figure 24 and Figure 25 As shown.

[0104] After the fillet weld between brake hanger support plate A, brake hanger upright plate B, and brake pipe C is completed on one side, the rotating shaft 2 of the L-type dual-axis positioner F is rotated 180° counterclockwise before welding the other side. See [link to welding sequence] for details. Figure 26 .

[0105] The welding parameters for the fillet weld between brake hanger stiffener plate A, brake hanger upright plate B, and brake pipe C are: current 230-250A, voltage 26-28V, and welding speed 24-36cm / min.

[0106] The above processes are all automated welding processes for the right part E1 of the brake hanger. The welding sequence and process for the left and right parts are the same.

[0107] The above description is merely a preferred embodiment of the present utility model and does not constitute a limitation on the scope of protection of the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the scope of protection of the claims of the present utility model.

Claims

1. An automated welding equipment for subway brake hangers, characterized in that, The welding equipment includes a first welding device for welding the circumferential weld between the brake hanger upright plate and the brake pipe, and the fillet weld between the stiffening plate and the upright plate and the brake pipe; the first welding device includes a dual-axis positioner, a welding robot and a brake hanger welding fixture, the dual-axis positioner is equipped with a brake hanger welding fixture, the brake hanger welding fixture includes a left part movable limit, a right part movable limit, a three-jaw chuck, a left part slide groove, a right part slide groove, a slide groove stop block and a movable positioning block; The three-jaw chuck has a cavity in the center for pre-clamping or securing the brake pipe of the brake hanger; one side of the three-jaw chuck has opposing left and right slide grooves, and the inner ends of the left and right slide grooves are fixed with slide groove blocks for sliding limit; the left and right slide grooves are respectively slidably erected with left and right movable limiters, and the upper ends of the left and right movable limiters are provided with movable positioning blocks, which are in contact with the upright plate of the brake hanger for positioning.

2. The automated welding equipment for subway brake hangers as described in claim 1, characterized in that, The left and right movable limiters can be withdrawn from the outer ends of the left and right slide grooves, respectively.

3. An automated welding equipment for subway brake hangers as described in claim 1 or 2, characterized in that, The left and right slide grooves are arranged adjacent to each other.

4. An automated welding equipment for subway brake hangers as described in claim 1 or 2, characterized in that, The sliding directions of the left and right movable limit switches are exactly opposite.

5. An automated welding equipment for subway brake hangers as described in claim 1 or 2, characterized in that, The movable positioning block is matched and limited at the head end of the vertical plate of the brake hanger.

6. An automated welding equipment for subway brake hangers as described in claim 1 or 2, characterized in that, The welding equipment also includes a second welding device for assembling and welding the sealing plate of the brake hanger to the brake pipe; the second welding device includes the following welding area: the two ends of the brake pipe are provided with brake pipe assembly limiters, and the outer sides of the two ends of the brake pipe are provided with sealing plate clamping parts. The sealing plate clamping parts can fix the sealing plate by the material of their own electromagnetic components, and the sealing plate is sent into the brake pipe for tack fixing and then withdrawn by the movement of the cylinder.

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