A guide electrode for clamping AT rail head of switch rail flash butt welding machine

Abstract

The utility model relates to the field of railway seamless turnout welding construction technology, specifically a kind of guiding electrode of clamping AT rail rail head suitable for turnout steel rail flash butt welding machine, and its AT rail includes AT rail thickening section, AT rail gradual change section being arranged from left to right, AT rail gradual change section is fixedly welded with steel rail I section, the cross section of guiding electrode clamped on the rail waist of AT rail thickening section is rectangular shape, the cross section of guiding electrode clamped on the rail waist of AT rail gradual change section is right-angled trapezoidal shape, and the hypotenuse surface is bonded with the rail waist of AT rail gradual change section;The problem that AT rail head cannot be effectively clamped and then flash butt welding process is carried out at turnout straight point rail root end, curved point rail root end and frog long center rail root end etc. is solved, the problem that AT rail can only adopt poor welding quality aluminium hot welding construction process is got rid of, so as to greatly improve the quality and precision of welded joint.

Description

Technical Field

[0001] This utility model relates to the field of railway seamless turnout welding construction technology, specifically a guide electrode for clamping the rail head of an AT rail applicable to a turnout rail flash welding machine. Background Technology

[0002] Flash welding is a welding method that uses the thermal effect of high-energy current to heat the rails to a plastic state, then applies pressure at extremely high speeds to join the rails together. The main advantages of flash welding are its high welding speed, high weld quality, weld joint strength comparable to the base material, smooth surface that is easy to grind and shape, stable joint quality, and ease of later maintenance. While there is no fundamental difference between welding rail joints inside turnouts and welding long rail joints in railway sections, due to limitations in existing equipment and technology, flash welding technology is difficult to apply to turnout rail joint welding.

[0003] Practice has shown that some rail joints in turnouts use special rails with variable cross-sections (AT rails), commonly found at the root ends of turnout switch rails, the root ends of long center rails, and rail expansion joints. Due to the change in the web dimensions of the rail before and after the rail joint, this change section is within the clamping range of the welding machine. The clamping electrode contact surface of the traditional welding machine head is planar, which makes it impossible to clamp the rail with gradually changing web dimensions, and thus impossible to complete the flash welding operation of the joint.

[0004] Some technical personnel in the field have proposed a solution: extend the root end of the switch rail and the long frog rail by 600mm before the turnout leaves the factory, expand the web area of ​​the standard section rail to meet the clamping length requirements of the welding machine, and adjust the guide rail length accordingly. This solution can solve the problem of the welding machine being unable to effectively clamp the AT rail. However, this solution requires changing the structural dimensions of the turnout, necessitating communication and coordination with the turnout design unit, turnout manufacturer, operation and maintenance departments, etc., resulting in a long customization cycle and high costs, making it impractical for widespread application.

[0005] Therefore, it is necessary to invent a guide electrode for clamping the rail head of the AT rail in a flash welding machine for turnout rails to solve the above problems. Utility Model Content

[0006] To address the problem that conventional flash welding machines cannot effectively clamp and weld AT rails, this invention provides a guide electrode for clamping the rail head of an AT rail using a flash welding machine for turnout rails, enabling flash welding of the AT rail web transition joint.

[0007] This utility model is achieved using the following technical solution: A guide electrode for clamping the rail head of an AT rail, applicable to a flash welding machine for turnout rails, includes an AT rail arranged from left to right and rail section I and rail section II fixedly connected to the AT rail. There is a weld seam between rail section I and rail section II. A flash welding machine is installed on both rail section I and rail section II. The flash welding machine includes two sets of conductive electrodes near the weld seam and two sets of guide electrodes away from the weld seam. The two sets of conductive electrodes are respectively installed on rail section I and rail section II, and the two sets of guide electrodes are respectively installed on the AT rail and rail section II. Each set of conductive electrodes includes two conductive electrodes clamped relative to each other on the web of rail section I or rail section II, and each set of guide electrodes includes two guide electrodes clamped relative to each other on the web of rail section AT rail or rail section II.

[0008] Furthermore, the AT rail includes a thickened AT rail section and a transition AT rail section arranged from left to right. The transition AT rail section is fixedly welded to the rail section I. The cross-section of the guide electrode clamped on the web of the thickened AT rail section is rectangular, and the cross-section of the guide electrode clamped on the web of the transition AT rail section is a right trapezoid, with its hypotenuse fitting against the web of the transition AT rail section.

[0009] Furthermore, the right end of the guide electrode is attached to the right end of the AT rail gradient section, and the left end of the guide electrode is attached to the AT rail thickening section.

[0010] Furthermore, the length of rail section I is 45cm, the web thickness is 16.5mm, and the height is 176mm. The web thickness of the thickened AT rail section is 32.5mm, and the height is 142mm. The length of the AT rail transition section is 15cm, and the web thickness of the AT rail transition section gradually changes from 32.5mm to 16.5mm and the height gradually changes from 142mm to 176mm from left to right. The inclined surface of the guide electrode is uniformly transitioned to match the web of the AT rail transition section.

[0011] Furthermore, bolts are installed on the guide electrode for detachable fixed connection with the flash welding machine, and a roller is installed at the top of the guide electrode.

[0012] Furthermore, the location of the AT rail includes the root end of the straight tip rail of the turnout, the root end of the curved tip rail, and the root end of the long center rail of the frog.

[0013] The present invention has a reasonable and reliable structural design and has the following effects; 1. By adjusting the cross-sectional dimensions of the guide electrode of the flash welding machine head, the problem of not being able to effectively clamp the AT rail head at the root ends of the straight and curved rails of turnouts and the root ends of the long frog rails of frogs, and thus not being able to perform flash welding, was solved. This eliminated the problem that AT rails could only be welded using the aluminothermic welding process with poor welding quality, thereby greatly improving the quality and precision of the welded joints.

[0014] 2. This utility model can achieve AT rail flash welding construction by adjusting only the cross-section of the guide electrode without replacing the welding equipment, making extensive modifications to the welding equipment and clamping device, or adjusting any structural dimensions of the turnout.

[0015] 3. The guide electrode in this utility model is simple to manufacture, easy to operate, flexible to use, and highly operable. It improves the efficiency of flash welding of turnouts and controls construction costs. It reasonably solves the problem of welding of turnout transition rails and has a strong reference and promotion effect on flash welding of other irregular rails. Attached Figure Description

[0016] Figure 1 This is a diagram showing the distribution of the changing positions of the middle rail waist in this utility model.

[0017] Figure 2 This is a schematic diagram of the flash welding machine in this utility model.

[0018] Figure 3 This is a schematic three-view drawing of the planar guide electrode in this utility model.

[0019] Figure 4 This is a schematic three-view drawing of the structure of this utility model.

[0020] Figure 5 These are three views showing the process of using the guide electrode with the beveled surface in this utility model.

[0021] In the diagram: 1-Flash welding machine, 2-Conductive electrode, 3-Guide electrode, 4-Rail section I, 5-AT rail thickened section, 6-AT rail transition section, 7-Bolt, 8-Roller. Detailed Implementation

[0022] A traditional flash welding machine 1 consists of eight electrodes, all of which are flat and tightly clamped. The four conductive electrodes closest to the rail weld seam are connected to the rail transformer and primarily function as conductors and clamping electrodes. The four electrodes furthest from the rail weld seam are non-conductive electrodes, also known as guide electrodes, and primarily function as guides and auxiliary clamping electrodes. All eight electrodes are bolted to the flash welding machine head and are detachable. (See attached image.) Figure 2 Appendix Figure 3 As shown.

[0023] However, some rail joints inside various turnouts use special rails with variable cross-sections (commonly known as AT rails). Taking the P60-18# turnout as an example, there are three weld joints where the rail web and cross-sectional height change, making it impossible for the flash welding machine head to clamp the rail. These locations are the heel end of the straight tip rail, the root end of the curved tip rail, and the root end of the frog's long frog rail (see attached). Figure 1As shown), the conductive and guiding electrodes embedded in the flash welding machine 1 need to be applied to the rail web. The effective clamping length (standard rail section) at these three locations is only 45cm, which is insufficient to effectively clamp and weld the rail.

[0024] The position where the cross-sectional dimensions of the AT rail begin to change is exactly at the clamping position of the guide electrode. Considering that among the eight electrodes, the four guide electrodes have the functions of guiding and assisting clamping, this utility model proposes a guide electrode for clamping the rail head of the AT rail in a turnout rail flash welding machine. The cross-sectional dimensions of the guide electrode are adjusted, and the conductive electrode 2 does not change, so it will not affect the welding voltage output and clamping force of the conductive electrode.

[0025] As attached Figure 4 Appendix Figure 5 As shown; a guide electrode for clamping the rail head of an AT rail applicable to a flash welding machine for turnout rails includes an AT rail arranged from left to right and rail section I 4 and rail section II fixedly connected to the AT rail. There is a weld seam between rail section I 4 and rail section II. A flash welding machine 1 is installed on rail section I 4 and rail section II. The flash welding machine 1 includes two conductive electrode groups near the weld seam and two guide electrode groups away from the weld seam. The two conductive electrode groups are respectively installed on rail section I 4 and rail section II, and the two guide electrode groups are respectively installed on the AT rail and rail section II. Each conductive electrode group includes two conductive electrodes 2 that are clamped relative to each other on the web of rail section I or rail section II, and each guide electrode group includes two guide electrodes 3 that are clamped relative to each other on the web of rail section AT or rail section II.

[0026] As attached Figure 5 As shown; the AT rail includes an AT rail thickening section 5 and an AT rail transition section 6 arranged from left to right. The AT rail transition section 6 is fixedly welded to rail section I 4. The guide electrode 3, which is clamped on the web of the AT rail thickening section 5, has a rectangular cross-section. The guide electrode 3, which is clamped on the web of the AT rail transition section 6, has a right-angled trapezoidal cross-section, and its hypotenuse is in contact with the web of the AT rail transition section 6. The right end of the guide electrode 3 is in contact with the right end of the AT rail transition section 6, and the left end of the guide electrode 3 is in contact with the AT rail thickening section 5.

[0027] As attached Figure 5 As shown; the length of rail section I 4 is 45cm, the web thickness is 16.5mm, and the height is 176mm; the web thickness of the thickened AT rail section 5 is 32.5mm, and the height is 142mm; the length of the AT rail transition section 6 is 15cm, and the web thickness of the AT rail transition section 6 gradually changes from 32.5mm to 16.5mm and the height gradually changes from 142mm to 176mm from left to right; the inclined surface of the guide electrode 3 cooperates with the web of the AT rail transition section 6 to achieve a uniform transition.

[0028] The guide electrode 3 includes a gradient zone with a range of 15cm. The starting contact surface of the gradient zone of the guide electrode 3 is consistent with the outer surface of the ordinary rail, and the ending contact surface of the guide electrode 3 is consistent with the outer surface of the thickened section 5 of the AT rail.

[0029] As attached Figure 4 As shown; the guide electrode 3 is equipped with bolts 7 for detachable fixed connection with the flash welding machine 1, and the top of the guide electrode 3 is equipped with a roller 8.

[0030] The location of the AT rail includes the root end of the straight tip rail of the turnout, the root end of the curved tip rail, and the root end of the long center rail of the frog.

[0031] Taking P60-18# turnout as an example, during operation, the railcar first travels to the location of the weld seam and completes alignment and other preparatory work.

[0032] Then remove the two planar guide electrodes 3 that are close to the AT rail and set opposite to each other, and replace them with guide electrodes 3 with beveled surfaces.

[0033] Next, the robotic arm inside the railcar lowers the flash welding machine 1 to the welding seam, so that the guide electrode 3 near the AT rail is located at the AT rail transition section 6, the conductive electrode 2 near the AT rail is located at rail section I 4, and the guide electrode 3 and conductive electrode 2 away from the AT rail are both located at rail section II; thus completing the clamping operation.

[0034] Finally, start the flash welding machine 1 and complete the welding operation according to the traditional flash welding process.

[0035] In the specific implementation process, the material, length, width, roller 8, bolt 7, and bolt hole position of the guide electrode 3 are all consistent with those of the conductive electrode 2.

[0036] The guide electrode 3 can be machined in one step according to the drawings, or it can be modified by grinding based on the conventional guide electrode 3 (i.e., planar guide electrode 3).

[0037] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A guide electrode for clamping the rail head of an AT rail in a flash welding machine for turnout rails, comprising an AT rail arranged from left to right and rail section I (4) and rail section II fixedly connected to the AT rail, wherein there is a weld seam between rail section I (4) and rail section II, characterized in that: A flash welding machine (1) is installed on both rail section I (4) and rail section II. The flash welding machine (1) includes two sets of conductive electrodes close to the weld seam and two sets of guide electrodes away from the weld seam. The two sets of conductive electrodes are installed on rail section I (4) and rail section II respectively, and the two sets of guide electrodes are installed on AT rail and rail section II respectively. Each set of conductive electrodes includes two conductive electrodes (2) that are clamped relative to each other on the web of rail section I or rail section II. Each set of guide electrodes includes two guide electrodes (3) that are clamped relative to each other on the web of rail section AT rail or rail section II.

2. The guide electrode for clamping the rail head of an AT rail in a flash welding machine for turnout rails according to claim 1, characterized in that: The AT rail includes a thickened section (5) and a transition section (6) arranged from left to right. The transition section (6) is fixedly welded to the rail section I (4). The cross-section of the guide electrode (3) clamped on the web of the thickened section (5) is rectangular. The cross-section of the guide electrode (3) clamped on the web of the transition section (6) is a right trapezoid, and its hypotenuse is in contact with the web of the transition section (6).

3. The guide electrode for clamping the rail head of an AT rail in a flash welding machine for turnout rails according to claim 2, characterized in that: The right end of the guide electrode (3) is attached to the right end of the AT rail gradient section (6), and the left end of the guide electrode (3) is attached to the AT rail thickening section (5).

4. The guide electrode for clamping the rail head of an AT rail in a flash welding machine for turnout rails according to claim 3, characterized in that: The length of the rail section I (4) is 45cm, the thickness of the rail web is 16.5mm, and the height is 176mm. The thickness of the rail web of the AT rail thickening section (5) is 32.5mm and the height is 142mm. The length of the AT rail transition section (6) is 15cm. The thickness of the rail web of the AT rail transition section (6) gradually changes from 32.5mm to 16.5mm from left to right, and the height gradually changes from 142mm to 176mm. The inclined surface of the guide electrode (3) is uniformly transitioned to match the rail web of the AT rail transition section (6).

5. The guide electrode for clamping the rail head of an AT rail in a flash welding machine for turnout rails according to claim 3, characterized in that: The guide electrode (3) is fitted with bolts (7) for detachable fixed connection with the flash welding machine (1), and a roller (8) is fitted at the top of the guide electrode (3).

6. The guide electrode for clamping the rail head of an AT rail in a flash welding machine for turnout rails according to claim 1, characterized in that: The location of the AT rail includes the root end of the straight tip rail of the turnout, the root end of the curved tip rail, and the root end of the long center rail of the frog.

Images