A welding tool for special-shaped connecting oil pipe on locomotive brake system

Abstract

The utility model discloses a kind of welding tool for the welding of special-shaped connecting oil pipe on locomotive brake system, including bottom plate, left end front side of bottom plate upside left end has locating block one and locating block two, left end rear side has locating block four, right end rear side has locating block three, locating block two includes vertical board one, vertical board one upper end is fixed with the oblique plate extending to rear side upper side, locating block one, oblique plate and locating block three all have insertion hole, locating pin one is inserted and installed in insertion hole interior, locating block four includes vertical board two, vertical board two upper end is fixed with the horizontal plate extending to front side, horizontal plate front end has waist hole two, waist hole two interior insertion installation has locating pin two.Significantly reduce the splicing positioning difficulty between each component, the welding seam between each component is better in close contact, effectively solve the problem that artificial splicing positioning difficulty is big, precision is poor, greatly improve splicing spot welding efficiency;Locomotive brake system on special-shaped connecting oil pipe quality good of welding forming, meet drawing requirement, and high qualified rate.

Description

Technical Field

[0001] This utility model relates to the field of pipeline welding equipment technology, specifically to a welding fixture for irregularly shaped connecting oil pipes on locomotive braking systems. Background Technology

[0002] like Figures 1-3 The diagram illustrates an irregularly shaped oil pipe for a locomotive braking system, comprising a main body A, a first connector sleeve B, a second connector sleeve C, and a "7"-shaped arm plate D. The main body A has a pipe connector A-1 bent at its right end, extending to the right along the X-axis, and a pipe connector A-2 bent at its left end, extending forward along the Y-axis. The left end of the first connector sleeve B has a countersunk groove B-1 coaxially connected to its central hole. The right end of the first connector A-1 is inserted into the countersunk groove B-1 and welded to the left end of the first connector sleeve B for fixed connection. The second connector sleeve C has an arc-shaped groove C-1 at its rear end. The front left side of the main body A has an oil passage hole. The rear end of the connector sleeve C is snapped into and welded to the front left side of the main body A through the arc groove C-1, and the connector sleeve C is inclined with the front higher than the rear. The oil passage hole is coaxially corresponding to the center hole of the connector sleeve C. The lower end of the vertical section of the "7"-shaped arm plate D is attached to and welded to the rear left side of the main body A. The front end of the horizontal section of the "7"-shaped arm plate D has a waist-shaped hole D-1, and the vertical section of the "7"-shaped arm plate D corresponds to the connector sleeve C. The inner right side of the pipe connector A-1, the inner side of the connector sleeve C, and the inner side of the connector sleeve B are all provided with internal thread structures.

[0003] Currently, the aforementioned irregularly shaped connecting oil pipes used in locomotive braking systems are still processed and formed by manual splicing and welding. The problems with this manual splicing and welding method are: (1) Since the irregularly shaped connecting oil pipes used in locomotive braking systems are irregularly shaped three-dimensional structural parts, it is difficult to splice and position the various parts. Multiple operators are required to work together during splicing and welding, resulting in low welding efficiency and high labor costs; (2) The splicing of various parts is greatly affected by human factors, making it difficult to ensure that each welded product meets the drawing requirements. The quality of the finished products is uneven, and the defect rate is high. Therefore, this utility model proposes a welding fixture for irregularly shaped connecting oil pipes used in locomotive braking systems in order to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this utility model is to overcome the defects in the existing technology and provide a welding fixture for irregularly shaped connecting oil pipes on locomotive braking systems. In use, the main body, connector sleeve one, connector sleeve two, and "7"-shaped arm plate are positioned, spliced, and then spot-welded together. This significantly reduces the positioning difficulty during splicing of the components, and the weld seams between the components on the irregularly shaped connecting oil pipe formed by splicing and spot welding are tighter. This effectively solves the problems of high difficulty and poor accuracy in manual splicing and positioning, greatly improving the efficiency of splicing and spot welding of irregularly shaped connecting oil pipes on locomotive braking systems. It overcomes the drawbacks of traditional manual splicing and welding methods being greatly affected by human factors, laying the foundation for subsequent dense welding processes. This results in high-quality irregularly shaped connecting oil pipes on locomotive braking systems that meet drawing requirements and significantly improve the finished product qualification rate. The overall structural design is ingenious and reasonable, with high feasibility for preparation and implementation, and good practicality.

[0005] To achieve the above objectives, the technical solution of this utility model is to design a welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system, including a base plate. The left front end of the upper side of the base plate has a positioning block one for positioning the front end of the pipe connector two on the irregularly shaped connecting oil pipe of the locomotive braking system and a positioning block two for positioning the connector sleeve two on the irregularly shaped connecting oil pipe of the locomotive braking system. The left rear end of the upper side of the base plate has a positioning block four for positioning the horizontal section of the "7"-shaped arm plate on the irregularly shaped connecting oil pipe of the locomotive braking system. The right rear end of the upper side of the base plate has a positioning block four for positioning the irregularly shaped connecting oil pipe of the locomotive braking system. The positioning block three connects to the connector sleeve one on the oil pipe. The positioning block two includes a vertical plate one fixed to the side of the base plate. The upper end of the vertical plate one is fixed with an inclined plate that gradually extends to the rear and upward. The positioning block one, the inclined plate and the positioning block three all have a vertical insertion hole that penetrates the plate body. A positioning pin one is inserted and installed inside the insertion hole. The positioning block four includes a vertical plate two fixed to the side of the base plate. The upper end of the vertical plate two is fixed with a horizontal plate that extends forward along the Y-axis. The front end of the horizontal plate has a waist-shaped hole two that penetrates the plate body. A positioning pin two is inserted and installed inside the waist-shaped hole two.

[0006] This utility model discloses a welding fixture for irregularly shaped connecting oil pipes on locomotive braking systems. In use, the main body, connector sleeve one, connector sleeve two, and "7"-shaped arm plate are positioned, spliced, and then spot-welded together. This significantly reduces the positioning difficulty during splicing of various components, and the weld seams between the components on the irregularly shaped connecting oil pipe formed by spot welding are tighter. It effectively solves the problems of high difficulty and poor accuracy in manual splicing and positioning, greatly improving the efficiency of splicing and spot welding of irregularly shaped connecting oil pipes on locomotive braking systems. It overcomes the drawbacks of traditional manual splicing and welding methods being greatly affected by human factors, laying the foundation for subsequent dense welding processes. This results in high-quality irregularly shaped connecting oil pipes on locomotive braking systems that meet drawing requirements, significantly improving the finished product qualification rate. The overall structural design is ingenious and reasonable, with high feasibility for fabrication and implementation, and good practicality.

[0007] The preferred technical solution is that the first positioning pin includes an end cap and a first insert rod, and the first insert rod is a screw; the second positioning pin includes an end cap and a second insert rod, and the cross-section of the second insert rod is an elliptical structure adapted to the oblong hole on the irregular connecting oil pipe of the locomotive braking system. The first and second positioning pins have ingenious and reasonable structural designs. The first insert rod on the first positioning pin is designed as a screw, which facilitates the screwing and fixing of the parts to the corresponding positioning blocks, thereby freeing the operator's hands. At the same time, it ensures that the parts will not shift during the spot welding process, further ensuring that the irregular connecting oil pipe of the locomotive braking system welded together has high precision and good quality.

[0008] A further preferred technical solution is that both end cap one and end cap two have a set of corresponding clamping surfaces on their outer peripheral surfaces. In use, the operator can hold the end cap with their hand or a tool to lock or remove the locating pin from the corresponding component and locating block. The clamping surfaces improve the ease of holding or clamping the locating pin.

[0009] A further preferred technical solution is that the upper end of the vertical plate two has a mounting groove one that runs through both the front and rear ends, and the rear end of the horizontal plate is inserted and fixedly installed inside the mounting groove one.

[0010] The left front side of the upper side of the base plate has a base adjacent to the right side of the positioning block one. The upper end of the base has a mounting groove two. The lower end of the vertical plate on the positioning block two is inserted and fixedly installed inside the mounting groove two.

[0011] A further preferred technical solution includes that the lower end of the positioning block, the base, the lower end of the third positioning block, and the lower end of the second vertical plate all have ear plates extending horizontally towards the outer periphery of the base plate. The ear plates and the base plate are fixedly connected together by screws passing through corresponding mounting holes on them. Positioning block two and positioning block four are made into a split structure, which facilitates processing and ensures the smooth preparation and implementation of the welding fixture for irregularly shaped connecting oil pipes in locomotive braking systems.

[0012] A further preferred technical solution is that a pad is fixed in the middle of the front side of the second vertical plate for positioning the vertical section of the "7"-shaped arm plate on the irregular connecting oil pipe of the locomotive braking system. The pad has a screw hole corresponding to the mounting hole one on the vertical section of the "7"-shaped arm plate. A positioning pin three is installed inside the screw hole. The positioning pin three has the same structure as the positioning pin one. During assembly, the horizontal section of the "7"-shaped arm plate is attached to the lower side of the horizontal plate of the positioning block four. The vertical section of the "7"-shaped arm plate is clamped between the left rear side of the main body and the front side of the pad. Then, the second insertion rod on the positioning pin two is inserted from top to bottom into the waist-shaped hole two on the horizontal plate and the waist-shaped hole one on the horizontal section of the "7"-shaped arm plate. The first insertion rod of the positioning pin three is passed from front to back through the mounting hole one on the "7"-shaped arm plate and screwed into the screw hole on the pad, so that the "7"-shaped arm plate is fixed on the positioning block, thereby effectively preventing the "7"-shaped arm plate from shifting position during spot welding.

[0013] The advantages and beneficial effects of this utility model are as follows:

[0014] 1. This utility model discloses a welding fixture for irregularly shaped connecting oil pipes on locomotive braking systems. In use, the main body, connector sleeve one, connector sleeve two, and "7"-shaped arm plate are positioned, spliced, and then spot-welded together. This significantly reduces the positioning difficulty during splicing of various components, and the weld seams between the components on the irregularly shaped connecting oil pipe formed by spot welding are tighter. It effectively solves the problems of high difficulty and poor accuracy in manual splicing and positioning, greatly improving the efficiency of spot welding irregularly shaped connecting oil pipes on locomotive braking systems. It overcomes the drawbacks of traditional manual splicing and welding methods being greatly affected by human factors, laying the foundation for subsequent dense welding processes. This results in high-quality irregularly shaped connecting oil pipes on locomotive braking systems that meet drawing requirements, significantly improving the finished product qualification rate. The overall structural design is ingenious and reasonable, with high feasibility for preparation and implementation, and good practicality.

[0015] 2. The first positioning pin includes an end cap and a insertion rod, and the insertion rod is a screw. The second positioning pin includes an end cap and a insertion rod, and the cross-section of the insertion rod is an elliptical structure adapted to the oblong hole on the irregular connecting oil pipe of the locomotive braking system. The first and second positioning pins are ingeniously and reasonably designed. The insertion rod on the first positioning pin is designed as a screw, which facilitates the screwing and fixing of the parts to the corresponding positioning blocks, thereby freeing the operator's hands. At the same time, it ensures that the parts will not shift during the spot welding process, further ensuring that the irregular connecting oil pipe of the locomotive braking system has high precision and good quality after welding.

[0016] 3. Both end cap one and end cap two have a set of corresponding clamping surfaces on their outer peripheral surfaces. In use, the operator can use their hands or tools to hold the end caps and lock or remove the positioning pins from the corresponding parts and positioning blocks. The clamping surfaces improve the ease of holding or clamping the positioning pins.

[0017] 4. The lower end of the positioning block, the base, the lower end of the third positioning block, and the lower end of the second vertical plate all have ear plates extending horizontally towards the outer periphery of the base plate. The ear plates and the base plate are fixedly connected together by screws passing through the corresponding mounting holes on them. Positioning block two and positioning block four are made into a split structure, which facilitates processing and ensures the smooth preparation and implementation of the welding fixture for irregularly shaped connecting oil pipes on locomotive braking systems.

[0018] 5. During assembly, the horizontal section of the "7"-shaped arm plate is attached to the lower side of the horizontal plate of the positioning block four. The vertical section of the "7"-shaped arm plate is clamped between the left rear side of the main body and the front side of the pad. Then, the second insertion rod on the positioning pin two is inserted from top to bottom into the waist-shaped hole two on the horizontal plate and the waist-shaped hole one on the horizontal section of the "7"-shaped arm plate. The first insertion rod of the positioning pin three is passed from front to back through the mounting hole one on the "7"-shaped arm plate and screwed into the screw hole on the pad, so that the "7"-shaped arm plate is fixed on the positioning block, thereby effectively preventing the "7"-shaped arm plate from shifting position during spot welding. Attached Figure Description

[0019] Figure 1 This is a perspective view of an irregularly shaped connecting oil pipe used in a locomotive braking system, as described in the background art.

[0020] Figure 2 This is a 3D view of connector sleeve one;

[0021] Figure 3 This is a 3D view of connector sleeve two;

[0022] Figure 4 This is a perspective view of a welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system, as shown in Embodiment 1.

[0023] Figure 5 This is a diagram showing the usage state of a welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system, as described in Example 1.

[0024] Figure 6 It is a 3D view of the positioning pin 1;

[0025] Figure 7 This is a 3D view of locating pin two;

[0026] Figure 8 This is a perspective view of a welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system, as shown in Embodiment 2.

[0027] Figure 9 This is a diagram showing the usage status of a welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system, as described in Example 2.

[0028] In the diagram: A. Main pipe; B. Connector sleeve 1; C. Connector sleeve 2; D. "7" shaped arm plate; E. Ear plate; F. Positioning pin 1; G. Positioning pin 2; A-1. Pipe connector 1; A-2. Pipe connector 2; B-1. Countersunk groove; C-1. Arc groove; D-1. Waist-shaped hole 1; D-2. Mounting hole 1; F-1. End cap 1; F-2. Insert rod 1; G-1. End cap 2; G-2. Insert rod 2; H. Screw hole; J. Positioning pin 3; K. Clamping surface; 1. Base plate; 2. Positioning block 1; 3. Positioning block 2; 4. Positioning block 3; 5. Positioning block 4; 6. Base; 3-1. Vertical plate 1; 3-2. Angled plate; 5-1. Vertical plate 2; 5-1a. Mounting groove 1; 5-2a. Waist-shaped hole 2; 5-2. Horizontal plate; 5-3. Pad; 6-1. Mounting groove 2. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0030] Example 1

[0031] like Figures 4-7As shown, a welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system includes a base plate 1. The left front side of the upper side of the base plate 1 has a positioning block 2 for positioning the front end of the pipe connector A-2 on the irregularly shaped connecting oil pipe of the locomotive braking system, and a positioning block 3 for positioning the connector sleeve C on the irregularly shaped connecting oil pipe of the locomotive braking system. The left rear side of the upper side of the base plate 1 has a positioning block 5 for positioning the horizontal section of the "7"-shaped arm plate D on the irregularly shaped connecting oil pipe of the locomotive braking system. The right rear side of the upper side of the base plate 1 has a positioning block 4 for positioning the connector sleeve B on the irregularly shaped connecting oil pipe of the locomotive braking system. The positioning block 2... 3 includes a vertical plate 3-1 fixed to the upper side of the base plate 1. The upper end of the vertical plate 3-1 is fixed with an inclined plate 3-2 that gradually extends to the rear and upward. The positioning block 2, the inclined plate 3-2 and the positioning block 4 all have insertion holes that penetrate the plate body vertically. A positioning pin F is inserted and installed inside the insertion hole. The positioning block 5 includes a vertical plate 5-1 fixed to the upper side of the base plate 1. The upper end of the vertical plate 5-1 is fixed with a horizontal plate 5-2 that extends forward along the Y-axis. The front end of the horizontal plate 5-2 has a waist-shaped hole 5-2a that penetrates the plate body. A positioning pin G is inserted and installed inside the waist-shaped hole 5-2a.

[0032] Preferably, the positioning pin F includes an end cap F-1 and a rod F-2, and the rod F-2 is a screw; the positioning pin G includes an end cap G-1 and a rod G-2, and the cross-section of the rod G-2 is an elliptical structure adapted to the waist-shaped hole D-1 on the irregular connecting oil pipe used for positioning the locomotive braking system.

[0033] More preferably, both end cap F-1 and end cap G-1 have a set of corresponding clamping surfaces K on their outer peripheral surfaces.

[0034] More preferably, the upper end of the vertical plate 5-1 has a mounting groove 5-1a that runs through both the front and rear ends, and the rear end of the horizontal plate 5-2 is inserted and fixedly installed inside the mounting groove 5-1a.

[0035] The upper side of the base plate 1 has a base 6 adjacent to the right side of the positioning block 2. The upper end of the base 6 has a mounting groove 6-1. The lower end of the vertical plate 3-1 on the positioning block 3 is inserted and fixedly installed inside the mounting groove 6-1.

[0036] More preferably, the lower ends of the positioning block 1 2, the base 6, the lower ends of the positioning block 3 4, and the lower ends of the vertical plate 2 5-1 all have ear plates E extending horizontally toward the outer periphery of the base plate 1. The ear plates E and the base plate 1 are fixedly connected together by screws passing through the corresponding mounting holes on them.

[0037] The working principle of a welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system in Example 1:

[0038] Step 1: Place the connector sleeve B vertically onto the left side of the positioning block 4, with the countersunk groove B-1 facing the left end. Insert a positioning pin F from right to left into the insertion hole on the positioning block 4. Hold the end cap F-1 with your hand or a tool and rotate it to screw the insertion rod F-2 into the inside of the connector sleeve B, thereby fixing and locking the connector sleeve B and the positioning block 4.

[0039] Step 2: Place the connector sleeve C vertically against the lower side of the inclined plate 3-2, with the arc groove C-1 facing the rear and lower side. Insert a positioning pin F from top to bottom into the insertion hole on the inclined plate 3-2. Hold the end cap F-1 with your hand or a tool and rotate it to screw the insertion rod F-2 into the inside of the connector sleeve C, thereby fixing and locking the connector sleeve C to the inclined plate 3-2.

[0040] Step 3: Place the main body A on the base plate 1, so that the right end of the pipe connector A-1 is inserted into the countersunk groove B-1 on the left end of the connector sleeve B, and the front side of the left end of the main body A is embedded in the arc groove C-1 at the rear end of the connector sleeve C. Insert a positioning pin F from front to back into the insertion hole on the positioning block 2. Hold the end cap F-1 with your hand or a tool and rotate it to screw the insertion rod F-2 into the front end of the pipe connector A-2, thereby fixing and locking the front end of the pipe connector A-2 to the positioning block 2.

[0041] Step 4: Attach the horizontal section of the “7”-shaped arm plate D to the lower side of the horizontal plate 5-2 of the positioning block 4 5, and attach the vertical section of the “7”-shaped arm plate D to the rear left side of the main body A. Insert the pin 2G-2 on the positioning pin 2G into the oblong hole 2 5-2a on the horizontal plate 5-2 and the oblong hole 1 D-1 on the horizontal section of the “7”-shaped arm plate D from top to bottom. Use one hand or tool to press the vertical section of the “7”-shaped arm plate D towards the rear left side of the main body A. Then spot weld the vertical section of the “7”-shaped arm plate D to the rear left side of the main body A.

[0042] Step 5: Spot weld the right end of pipe fitting A-1 to the left end of fitting sleeve B, spot weld the rear end of fitting sleeve C to the front left side of main body A, remove each positioning pin F and positioning pin G, and finally remove the irregular connecting oil pipe on the locomotive brake system after the splicing and spot welding are completed.

[0043] In practice, steps 2 and 3 can be performed simultaneously or in reverse order.

[0044] Example 2

[0045] like Figures 8-9 As shown, a welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system differs from the welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system in that: a pad 5-3 for positioning the vertical section of the "7"-shaped arm plate D on the irregularly shaped connecting oil pipe of the locomotive braking system is fixedly provided on the middle of the front side of the vertical plate 5-1. The pad 5-3 has a screw hole H corresponding to the mounting hole D-2 on the vertical section of the "7"-shaped arm plate D. A positioning pin 3J is installed inside the screw hole H. The positioning pin 3J has the same structure as the positioning pin 1F.

[0046] The working principle of a welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system in Example 2:

[0047] Step 1: Place the connector sleeve B vertically onto the left side of the positioning block 4, with the countersunk groove B-1 facing the left end. Insert a positioning pin F from right to left into the insertion hole on the positioning block 4. Hold the end cap F-1 with your hand or a tool and rotate it to screw the insertion rod F-2 into the inside of the connector sleeve B, thereby fixing and locking the connector sleeve B and the positioning block 4.

[0048] Step 2: Place the connector sleeve C vertically against the lower side of the inclined plate 3-2, with the arc groove C-1 facing the rear and lower side. Insert a positioning pin F from top to bottom into the insertion hole on the inclined plate 3-2. Hold the end cap F-1 with your hand or a tool and rotate it to screw the insertion rod F-2 into the inside of the connector sleeve C, thereby fixing and locking the connector sleeve C to the inclined plate 3-2.

[0049] Step 3: Place the main body A on the base plate 1, so that the right end of the pipe connector A-1 is inserted into the countersunk groove B-1 on the left end of the connector sleeve B, and the front side of the left end of the main body A is embedded in the arc groove C-1 at the rear end of the connector sleeve C. Insert a positioning pin F from front to back into the insertion hole on the positioning block 2. Hold the end cap F-1 with your hand or a tool and rotate it to screw the insertion rod F-2 into the front end of the pipe connector A-2, thereby fixing and locking the front end of the pipe connector A-2 to the positioning block 2.

[0050] Step 4: Attach the horizontal section of the "7"-shaped arm plate D to the lower side of the horizontal plate 5-2 of the positioning block 4 5. Clamp the vertical section of the "7"-shaped arm plate D between the left rear side of the main body A and the front side of the pad 5-3. Insert the pin 2G-2 on the positioning pin 2G into the waist-shaped hole 2 5-2a on the horizontal plate 5-2 and the waist-shaped hole 1 D-1 on the horizontal section of the "7"-shaped arm plate D from top to bottom. Pass the pin 1 on the positioning pin 3J through the mounting hole 1 D-2 on the "7"-shaped arm plate D from front to back and screw it into the screw hole H on the pad 5-3. Then spot weld the vertical section of the "7"-shaped arm plate D to the left rear side of the main body A to fix it together.

[0051] Step 5: Spot weld the right end of pipe fitting A-1 to the left end of fitting sleeve B, spot weld the rear end of fitting sleeve C to the front left side of main body A, remove each positioning pin F and positioning pin G, and finally remove the irregular connecting oil pipe on the locomotive brake system after the splicing and spot welding are completed.

[0052] In practice, steps 2 and 3 can be performed simultaneously or in reverse order.

[0053] This utility model discloses a welding fixture for irregularly shaped connecting oil pipes on locomotive braking systems. In use, the main body, connector sleeve one, connector sleeve two, and "7"-shaped arm plate are positioned, spliced, and then spot-welded together. This significantly reduces the positioning difficulty during splicing of various components, and the weld seams between the components on the irregularly shaped connecting oil pipe formed by spot welding are tighter. It effectively solves the problems of high difficulty and poor accuracy in manual splicing and positioning, greatly improving the efficiency of splicing and spot welding of irregularly shaped connecting oil pipes on locomotive braking systems. It overcomes the drawbacks of traditional manual splicing and welding methods being greatly affected by human factors, laying the foundation for subsequent dense welding processes. This results in high-quality irregularly shaped connecting oil pipes on locomotive braking systems that meet drawing requirements, significantly improving the finished product qualification rate. The overall structural design is ingenious and reasonable, with high feasibility for fabrication and implementation, and good practicality.

[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A welding fixture for irregularly shaped connecting oil pipes in a locomotive braking system, characterized in that, The system includes a base plate (1), the upper side of which has a positioning block 1 (2) for positioning the front end of the pipe joint 2 (A-2) of the special-shaped connecting oil pipe on the locomotive braking system and a positioning block 2 (3) for positioning the joint sleeve 2 (C) of the special-shaped connecting oil pipe on the locomotive braking system. The upper side of which has a positioning block 4 (5) for positioning the horizontal section of the "7"-shaped arm plate (D) on the special-shaped connecting oil pipe on the locomotive braking system is located on the left rear side. The upper side of which has a positioning block 3 (4) for positioning the joint sleeve 1 (B) of the special-shaped connecting oil pipe on the locomotive braking system is located on the right rear side. The positioning block 2 (3) includes a vertical plate fixed to the upper side of the base plate (1).

1. (3-1) The upper end of the vertical plate 1 (3-1) is fixed with an inclined plate (3-2) that gradually extends to the rear and upward. The positioning block 1 (2), the inclined plate (3-2) and the positioning block 3 (4) all have a vertical insertion hole that penetrates the plate body. The insertion hole is fitted with a positioning pin 1 (F). The positioning block 4 (5) includes a vertical plate 2 (5-1) fixed on the upper side of the bottom plate (1). The upper end of the vertical plate 2 (5-1) is fixed with a horizontal plate (5-2) that extends forward along the Y-axis. The front end of the horizontal plate (5-2) has a waist-shaped hole 2 (5-2a) that penetrates the plate body. The waist-shaped hole 2 (5-2a) is fitted with a positioning pin 2 (G).

2. The welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system as described in claim 1, characterized in that, The positioning pin one (F) includes an end cap one (F-1) and a insertion rod one (F-2), and the insertion rod one (F-2) is a screw; the positioning pin two (G) includes an end cap two (G-1) and a insertion rod two (G-2), and the cross-section of the insertion rod two (G-2) is an elliptical structure adapted to the waist-shaped hole one (D-1) on the irregular connecting oil pipe used for positioning the locomotive braking system.

3. The welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system as described in claim 2, characterized in that, Both end cap one (F-1) and end cap two (G-1) have a set of corresponding clamping surfaces (K) on their outer peripheral surfaces.

4. The welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system as described in claim 3, characterized in that, The upper end of the vertical plate 2 (5-1) has a mounting groove 1 (5-1a) that runs through both the front and rear ends, and the rear end of the horizontal plate (5-2) is inserted and fixedly installed inside the mounting groove 1 (5-1a). The upper side of the base plate (1) has a base (6) adjacent to the right side of the positioning block (2). The upper end of the base (6) has a mounting groove (6-1). The lower end of the vertical plate (3-1) on the positioning block (3) is inserted and fixedly installed inside the mounting groove (6-1).

5. The welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system as described in claim 4, characterized in that, The lower ends of the positioning block one (2), the base (6), the lower ends of the positioning block three (4) and the lower ends of the vertical plate two (5-1) all have ear plates (E) extending horizontally towards the outer periphery of the base plate (1). The ear plates (E) and the base plate (1) are fixedly connected together by screws passing through the corresponding mounting holes on them.

6. The welding fixture for irregularly shaped connecting oil pipes on a locomotive braking system as described in claim 5, characterized in that, The front side of the vertical plate 2 (5-1) is fixed with a pad (5-3) for positioning the vertical section of the "7"-shaped arm plate (D) on the irregular connecting oil pipe of the locomotive braking system. The pad (5-3) has a screw hole (H) corresponding to the mounting hole 1 (D-2) on the vertical section of the "7"-shaped arm plate (D). The screw hole (H) is fitted with a positioning pin 3 (J). The positioning pin 3 (J) has the same structure as the positioning pin 1 (F).

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