Constant current flash butt welder

Abstract

The application discloses a constant-current flash butt welding machine and relates to the technical field of butt welding.The constant-current flash butt welding machine comprises a rack, a first welding clamping mechanism and a second welding clamping mechanism are oppositely arranged on the rack, the second welding clamping mechanism comprises a rotating cylinder used for clamping a bar, a laser cutting mechanism is arranged on the rotating cylinder, a polishing mechanism is also arranged on the rotating cylinder, and the rotating cylinder has two working strokes: when the rotating cylinder is located at the first working stroke, the rotating cylinder drives the laser cutting mechanism to cut a ring-shaped protrusion formed by welding the bar; and when the rotating cylinder is located at the second working stroke, the rotating cylinder drives the polishing mechanism to polish the welding flash after cutting. The polishing function is integrated in one set of welding clamping mechanisms, the space between the two sets of welding clamping mechanisms is small, sufficient space cannot be provided for polishing after welding, and the polishing is limited, so that the normal polishing is affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of butt welding, in particular to a constant current flash butt welding machine. BACKGROUND

[0002] It is known that the constant current flash butt welding machine is a device that uses the heat generated by the current passing through the welding parts for welding, and realizes a more stable welding process through constant current control technology. During the flash butt welding of the rod, two sets of welding clamping mechanisms are generally needed to clamp the ends of the two rods, and then the two sets of welding clamping mechanisms are synchronized to feed the butt joint, thereby completing the butt welding operation of the rod.

[0003] The patent application file with application number CN202311595933.5, application date 2023-11-28, and name "Butt welding device with welding joint shaping function and use method thereof" includes a base; the top of the base is provided with a butt welding assembly and a straightening assembly, and the side wall of the base is provided with a polishing assembly; the top of the base is fixedly connected with the bottom of a control box, and the side wall of the base is provided with a sliding groove in sliding connection with a slag receiving drawer; the slag receiving drawer is located below the butt welding assembly; the butt welding assembly includes a welding assembly and a sliding assembly; the top of the base is provided with the welding assembly and the sliding assembly, and the sliding assembly is connected with the welding assembly. Through the above-mentioned mode, the present application can narrow the fusion of the workpiece by clamping and extruding the workpiece with the welding assembly, facilitate polishing, and use the method of workpiece impacting the clamp to make the excess metal of the outer circle of the welding joint fall off, saving polishing time and improving work efficiency.

[0004] In the prior art, after the welding is completed, the next process, i.e. polishing, needs to be processed. In the above-mentioned comparative file, after the welding is completed, the welding position is directly polished, but due to the small space between the two sets of welding clamping mechanisms, sufficient space cannot be provided for polishing after the welding is completed, which limits the polishing and affects the normal polishing. SUMMARY

[0005] The purpose of the present application is to provide a constant current flash butt welding machine to solve the above-mentioned problems in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A constant current flash butt welding machine, comprising a rack, a first welding clamping mechanism and a second welding clamping mechanism are oppositely arranged on the rack, the second welding clamping mechanism comprises a rotating cylinder for clamping a bar, a laser cutting mechanism is arranged on the rotating cylinder, a polishing mechanism is also arranged on the rotating cylinder, the rotating cylinder has two working strokes: when the rotating cylinder is in the first working stroke, it drives the laser cutting mechanism to cut the annular protrusion formed by welding the bar; when the rotating cylinder is in the second working stroke, it drives the polishing mechanism to polish the welding flash after cutting.

[0008] The constant current flash butt welding machine, the first welding clamping mechanism comprises a sliding seat slidingly connected to the rack, an electric telescopic rod is installed on the sliding seat, a first clamp is arranged on the telescopic end of the electric telescopic rod, and a second clamp is arranged below the first clamp on the sliding seat.

[0009] The constant current flash butt welding machine, a hydraulic cylinder is further arranged on the rack, the telescopic end of the hydraulic cylinder is connected to the sliding seat, a guide groove is formed in the rack, and the sliding seat is slidingly connected to the inside of the guide groove through a sliding block.

[0010] The constant current flash butt welding machine, a fixed box is connected to the rack, the rotating cylinder is rotatably connected to the inside of the fixed box, the rotating cylinder penetrates the fixed box and extends to the outside of the fixed box, and a rotating seat is arranged on one side of the rotating cylinder.

[0011] The constant current flash butt welding machine, the fixed box is arranged on one side of the first welding clamping mechanism, and a through hole is formed in the inside of the fixed box, the through hole penetrates and extends to both sides of the fixed box.

[0012] The constant current flash butt welding machine, the laser cutting mechanism comprises two sliding rods connected to the rotating seat, two sliding grooves are formed in the inside of the rotating cylinder, the laser cutting head is arranged on one end of each sliding rod penetrating the sliding groove and extending to the outside of the rotating cylinder, the laser cutting head is used for cutting the annular protrusion, and the laser cutting head is slidingly connected to the inside of the sliding groove.

[0013] The constant current flash butt welding machine, the polishing mechanism comprises an annular polishing portion formed in the end of the rotating cylinder, and the annular polishing portion is used for polishing the welding flash after cutting the annular protrusion.

[0014] The constant current flash butt welding machine has a first driving unit arranged on the rotating seat, the first driving unit comprises a ring gear arranged on the rotating seat, a motor is arranged on the frame through a support, a transmission gear is connected to the output shaft of the motor, and the transmission gear is engaged with the ring gear.

[0015] The constant current flash butt welding machine has a second driving unit arranged on the fixed box, the second driving unit comprises a fixed ring connected to the rotating cylinder, and an annular groove is arranged on the fixed ring.

[0016] The constant current flash butt welding machine has an electric cylinder arranged on the frame, a pushing plate is connected to the telescopic end of the electric cylinder, a through groove is arranged on the top of the fixed box, the pushing plate is slidingly connected to the inside of the through groove, and the pushing plate penetrates through the annular groove and extends into the inside of the annular groove, so that the pushing plate is rotationally connected with the annular groove.

[0017] In the above technical solution, the constant current flash butt welding machine provided by the application has a group of welding clamping mechanisms integrated with polishing functions, so that the space between the two groups of welding clamping mechanisms is small, and sufficient space cannot be provided for polishing after welding, which limits polishing and affects normal polishing. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0019] Figure 1 A structure diagram of a constant current flash butt welding machine provided by the embodiment of the present application is provided.

[0020] Figure 2 Another perspective structure diagram of a constant current flash butt welding machine provided by the embodiment of the present application is provided.

[0021] Figure 3 Another perspective structure diagram of a constant current flash butt welding machine provided by the embodiment of the present application is provided.

[0022] Figure 4 A structure diagram of another embodiment of a constant current flash butt welding machine provided by the embodiment of the present application is provided. Figure 3 A sectional structure diagram of a fixed box in the embodiment of the present application is provided.

[0023] Figure 5 Another perspective structure diagram of a constant current flash butt welding machine provided by the embodiment of the present application is provided.

[0024] Figure 6 A structure diagram of another embodiment of a constant current flash butt welding machine provided by the embodiment of the present application is provided.Figure 5 Structural schematic diagram of another perspective of the laser cutting head;

[0025] Figure 7 Structural schematic diagram of another embodiment of a constant current flash butt welding machine provided by the embodiment of the present application;

[0026] Figure 8 For Figure 7 Partial enlarged schematic diagram at A in the embodiment;

[0027] Figure 9 For Figure 8 Structural schematic diagram of a cross section of the connecting block.

[0028] Legend of reference signs:

[0029] 1, frame; 2, rotating cylinder; 3, sliding seat; 4, electric telescopic rod; 5, first clamp; 6, second clamp; 7, hydraulic cylinder; 8, guide groove; 9, fixed box; 10, rotating seat; 11, through hole; 12, sliding rod; 13, sliding groove; 14, laser cutting head; 15, annular polishing part; 16, ring gear; 17, transmission gear; 18, fixed ring; 19, annular groove; 20, electric cylinder; 21, push plate; 22, through groove; 23, motor; 24, rotating shaft; 25, torsional spring; 26, horizontal opening; 27, connecting block; 28, movable groove; 29, trigger block; 30, extrusion spring; 31, protruding block. DETAILED DESCRIPTION

[0030] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0031] As Figures 1-9 shown, the constant current flash butt welding machine provided by the embodiment includes a frame 1, the frame 1 is provided with a first welding clamping mechanism and a second welding clamping mechanism in opposition, the second welding clamping mechanism includes a rotating cylinder 2 for clamping a bar, the rotating cylinder 2 is provided with a laser cutting mechanism, and the rotating cylinder 2 is further provided with a polishing mechanism, the rotating cylinder 2 has two working strokes: when the rotating cylinder 2 is located at the first working stroke, it drives the laser cutting mechanism to cut the annular protrusion formed by welding the bar; when the rotating cylinder 2 is located at the second working stroke, it drives the polishing mechanism to polish the welding flash after cutting.

[0032] Specifically, the frame 1 is a main body structure and is arranged vertically, and a machining table is arranged on the frame 1; the bottom of the machining table is provided with a plurality of supporting legs, and the supporting legs are all fixed to a fixed base such as the ground; the vertical side wall of the frame 1 is provided with the first welding clamping mechanism and the second welding clamping mechanism in opposition, as Figure 1The first welding clamping mechanism is located at the right side of the second welding clamping mechanism.

[0033] The first welding clamping mechanism comprises a sliding seat 3 slidably connected to the rack 1, an electric telescopic rod 4 mounted on the sliding seat 3, a first clamp 5 provided at the telescopic end of the electric telescopic rod 4, a second clamp 6 provided on the sliding seat 3 below the first clamp 5, and a hydraulic cylinder 7 provided on the rack 1 and connected to the sliding seat 3 at the telescopic end. A plurality of guide grooves 8 are formed in the rack 1, and the sliding seat 3 is slidably connected to the two guide grooves 8 through two sliding blocks. It should be noted that the working direction of the sliding seat 3 is horizontal movement, that is, the first welding clamping mechanism as a whole moves horizontally and approaches the second welding clamping mechanism, so that the end of one bar approaches the end of another bar, thereby facilitating welding operation. In this embodiment, the electric telescopic rod 4 is vertically arranged and used to drive the first clamp 5 to move vertically, and the working direction of the first clamp 5 and the second clamp 6 is vertical, thereby achieving clamping of the bar.

[0034] The rack 1 is also provided with a flash mechanism (prior art, not shown in the figure), which is arranged between the first welding clamping mechanism and the second welding clamping mechanism and comprises a welding head arranged on the rack 1. The welding current generated by the welding head passes through the bar to generate resistance heat, gradually heating and melting the end face of the bar to form a flash. During the flash process, the metal of the end face of the bar on the first welding clamping mechanism and the metal of the end face of the bar on the second welding clamping mechanism melt and spray to form a liquid metal beam. Then, the first welding clamping mechanism as a whole slides horizontally on the rack 1 to approach and press the welding end face of one bar to the welding end face of another bar, so that the liquid metal and oxides of the welding end faces of the two bars are extruded, the solid metal of the end faces of the two bars is in close contact, and a firm joint (annular protrusion) is formed. The above are all prior art and will not be described in detail.

[0035] The innovation of this embodiment lies in that the second welding clamping mechanism comprises a rotating cylinder 2 for clamping the bar, the rotating cylinder 2 is provided with a laser cutting mechanism, and the rotating cylinder 2 is also provided with a polishing mechanism. The rotating cylinder 2 has two working strokes: when the rotating cylinder 2 is in the first working stroke, it drives the laser cutting mechanism to cut the annular protrusion formed by welding the bar; when the rotating cylinder 2 is in the second working stroke, it drives the polishing mechanism to polish the cut welding bump.

[0036] Specifically, the rack 1 is provided with a fixed box 9, the fixed box 9 serves as a mounting base of the rotating cylinder 2, the rotating cylinder 2 is rotationally connected to the fixed box 9, one end of the rotating cylinder 2 penetrates through the fixed box 9 and extends to the outside of the fixed box 9, and the other end of the rotating cylinder 2 is provided with a rotating seat 10;

[0037] The rotating cylinder 2 is provided with a laser cutting mechanism, the laser cutting mechanism comprises two sliding rods 12 connected to the rotating seat 10, two sliding grooves 13 are formed in the cylinder body of the rotating cylinder 2 along the axial direction, each sliding rod 12 penetrates through the sliding groove 13 and extends to the outside of the rotating cylinder 2, and the end extending to the outside of the rotating cylinder 2 is provided with a laser cutting head 14, the laser cutting head 14 is used for emitting laser to the annular protrusion for cutting, and the laser cutting head 14 is slidingly connected to the sliding groove 13;

[0038] The rotating cylinder 2 is also provided with a polishing mechanism, the polishing mechanism is an annular polishing part 15 connected to the end of the rotating cylinder 2, the annular polishing part 15 is used for polishing the welding tumor after cutting the annular protrusion; the rotating seat 10 is provided with a first driving unit, the first driving unit comprises an annular gear 16 provided on the rotating seat 10, the rack 1 is provided with a motor 23 through a support, a transmission gear 17 is connected to the output shaft of the motor 23, and the transmission gear 17 is engaged with the annular gear 16;

[0039] The fixed box 9 is provided with a second driving unit, the second driving unit comprises a fixed ring 18 connected to the rotating cylinder 2, and an annular groove 19 is formed in the fixed ring 18; the rack 1 is provided with an electric cylinder 20, a pushing plate 21 is connected to the telescopic end of the electric cylinder 20, a through groove 22 is formed in the top of the fixed box 9, the pushing plate 21 is slidingly connected to the inside of the through groove 22, and the pushing plate 21 penetrates through the annular groove 19 and extends to the inside of the annular groove 19, so that the pushing plate 21 is rotationally connected with the annular groove 19.

[0040] Specifically, the fixed box 9 is arranged on one side of the first welding clamping mechanism, and a through hole 11 is formed in the fixed box 9, the through hole 11 extends to both sides of the fixed box 9 respectively, the rotating seat 10 is rotatably connected to one side of the fixed box 9, and the rotating cylinder 2 is rotatably connected to the other side of the fixed box 9; the distance between the rotating seat 10 and the rotating cylinder 2 can be adjusted by the axial movement of the rotating cylinder, and the rotating seat 10 and the rotating cylinder 2 are both cylindrical bodies with the same inner diameter; when the rod is inserted into the rotating cylinder 2 first, it is inserted into the rotating seat 10, and the position of the rod is limited by the vertical bottom wall of the rotating seat 10, so that the rod cannot slide horizontally, so that the two rods cannot move axially when the first welding clamping mechanism clamps one rod and the other rod for butt welding, thereby completing the butt welding preparation operation between the two rods; it should be noted that a plurality of balls (not shown in the figure) are preferably arranged in the rotating cylinder 2, so that when the rod is inserted into the rotating cylinder 2, the balls are in rolling contact with the outer surface of the rod, so that when the rotating cylinder 2 rotates, the rod does not rotate with it, but is in a stationary state, so that after butt welding is completed, the rotating cylinder 2 is rotated to facilitate cutting and subsequent polishing of the annular protrusion on the rod;

[0041] The rotating seat 10 and the rotating cylinder 2 are drivingly connected by a sliding rod 12, and several rod members can be optionally provided for transmission to improve the stability of transmission, the two ends of the rod member are connected to the rotating seat 10 and the rotating cylinder 2 respectively, and at least one end is sliding, so that when the rotating seat 10 rotates, the rotating cylinder 2 is passively rotated to realize synchronous rotation of the two, that is, the laser cutting head 14 at the end of the rotating cylinder 2 is rotated to cut the annular protrusion of the two rods in rotation (annular); it should be noted that the slot of the sliding groove 13 is matched with the diameter of the laser cutting head 14, so that when the rotating cylinder 2 slides horizontally to enter the polishing position, the laser cutting head 14 can slide into the inside of the sliding groove 13, so that the annular polishing part 15 at the end of the rotating cylinder 2 is not blocked by the laser cutting head 14, and is completely displayed; in the embodiment, an annular inclined surface is formed on the annular polishing part 15 as a polishing surface, the annular inclined surface polishes the welding tumor formed after the annular protrusion is cut, so that the polished welding tumor can smoothly enter the inside of the rotating cylinder 2, that is, the volume of the polished welding tumor meets the production requirements;

[0042] In this embodiment, the ring gear 16 is engaged with the transmission gear 17, so that by driving the rotation of the ring gear 16, the rotating seat 10 and the rotating cylinder 2 are synchronously rotated in the inside of the fixed box 9, and the laser cutting head 14 is also synchronously rotated, so as to rotate and cut the annular protrusion formed by the butt welding of the two bars;

[0043] The end of the push plate 21 is matched with the annular groove 19, when the rotating cylinder 2 rotates, the end of the push plate 21 slides in the inside of the annular groove 19, and when the electric cylinder 20 is started, the push plate 21 is driven to move horizontally, so as to drive the rotating cylinder 2 to move horizontally while keeping rotating, so as to drive the annular polishing part 15 on the rotating cylinder 2 to approach and abut on the weld bead formed after cutting, so as to polish it;

[0044] In the above description, the rotating cylinder 2 has two working strokes:

[0045] When the rotating cylinder 2 is in the first working stroke, that is, the rotating cylinder 2 is driven to rotate, so as to drive the laser cutting head 14 on the rotating cylinder 2 to rotate, at this time, the laser cutting head 14 is also started to emit cutting laser, so as to rotate and cut the annular protrusion formed by the butt welding of the two bars;

[0046] When the rotating cylinder 2 is in the second working stroke, that is, the rotating cylinder 2 is driven to move horizontally while rotating, so as to make the annular polishing part 15 at the end of the rotating cylinder 2 abut on the weld bead after cutting, so as to polish it;

[0047] Specifically, when switching from the first working stroke to the second working stroke, the electric cylinder 20 is started to drive the push plate 21 to slide horizontally, so as to push the rotating cylinder 2 to slide horizontally while rotating, in this process, the annular protrusion formed by the butt welding of the two bars is cut and the weld bead after cutting is polished;

[0048] In the above description, the switching action from the first working stroke to the second working stroke is switched by the electric cylinder 20, specifically, before welding, first, the positions of the two bars are placed, one of which is inserted into the inside of the rotating cylinder 2 and continues to be pushed until the bar enters the inside of the rotating seat 10 (at this time, the bar cannot be pushed again), then the other bar is placed on the second clamp 6, the first clamp 5 is driven to move downward by starting the electric telescopic rod 4 to clamp and fix the other bar, then the sliding seat 3 is driven to slide on the rack 1 by starting the hydraulic cylinder 7, so as to drive the end of one bar to approach the end of the other bar, in this process, the end faces of the two bars are gradually heated and melted by starting the flash mechanism, and approach each other, so as to weld the end faces of the two bars together, and during the welding process, an annular protrusion is formed.

[0049] When cutting the annular protrusion, the motor 23 is started to drive the transmission gear 17 on the output shaft of the motor 23 to drive the annular gear 16 on the rotating seat 10 to rotate, thereby driving the rotating seat 10 and the rotating cylinder 2 to rotate synchronously, that is, driving the laser cutting head 14 to rotate, starting the laser cutting head 14, and thereby cutting the annular protrusion;

[0050] When cutting is completed and polishing is performed, in the process of rotating the rotating cylinder 2, that is, driving the push plate 21 to move relatively in the annular groove 19, when the electric cylinder 20 is started, the push plate 21 is driven to move horizontally, so as to realize that the rotating cylinder 2 moves horizontally while rotating, thereby driving the annular polishing part 15 to approach and abut on the weld bead formed after cutting, so as to polish it.

[0051] The beneficial effect of the embodiment is that one set of welding clamping mechanisms is integrated with the polishing function, so that the space between the two sets of welding clamping mechanisms is small, so that after welding is completed, sufficient space cannot be provided for polishing, which limits polishing, thereby affecting the normal polishing.

[0052] Further, referring to Figures 5-6 When the annular protrusion is cut, the waste generated after cutting is also annular in shape, and is sleeved on the surface of the bar, which is not convenient for subsequent processing.

[0053] Therefore, based on the above description, in order to avoid that the waste after cutting continues to stay on the surface of the bar, the embodiment provides an adjusting structure, the laser cutting head 14 is rotatably connected to the sliding rod 12 through the rotating shaft 24, the outer surface of the rotating shaft 24 is sleeved with a torsion spring 25, one end of the torsion spring 25 is connected to the rotating shaft 24, and the other end is connected to the sliding rod 12.

[0054] In the embodiment, the laser cutting head 14 has two working states:

[0055] When the laser cutting head 14 is in the first working state, that is, arranged in a horizontal state, the annular protrusion is cut through the rotation of the laser cutting head 14;

[0056] When the laser cutting head 14 is in the second working state, that is, arranged in an inclined state, the waste after cutting the annular protrusion is cut obliquely;

[0057] Specifically in cutting, by starting the motor 23, the transmission gear 17 on the output shaft of the motor 23 drives the annular gear 16 on the rotating seat 10 to rotate, thereby driving the rotating seat 10 and the rotating cylinder 2 to rotate synchronously, and driving the laser cutting head 14 to rotate, thereby cutting the annular protrusion. At this time, the waste produced after cutting the annular protrusion is also annular and is sleeved on the surface of the bar. At this time, the motor 23 is stopped, and the electric cylinder 20 is started to drive the push plate 21 to move horizontally. The moving direction is towards the rotating seat 10, so that the laser cutting head 14 moves out of the sliding groove 13. At this time, due to the limitation of the sliding groove 13, the laser cutting head 14 is passively rotated by the rebound of the torsional spring 25, that is, it is inclined and swings, thereby cutting the annular waste on the bar into two parts, and the waste is separated from the bar under the action of gravity.

[0058] When the cutting is completed, the electric cylinder 20 is started again to drive the push plate 21 to move reversely, and the laser cutting head 14 slides into the sliding groove 13 through the guidance of the annular polishing part 15. In this process, the laser cutting head 14 moves from the inclined state to the horizontal state, thereby performing the next annular cutting operation.

[0059] Further, please refer to Figures 7-9 In the above polishing process, the rotating cylinder 2 moves horizontally while rotating, so that the annular polishing part 15 approaches and abuts on the weld bead formed after cutting, thereby polishing the weld bead. However, when the annular polishing part 15 polishes, the generated debris is easy to enter the notch of the sliding groove 13 on the annular polishing part 15, so that the laser cutting head 14 cannot move out of the sliding groove 13, that is, the laser cutting head 14 is stuck in the moving process.

[0060] Therefore, based on the above description, in order to avoid the debris generated by polishing from entering the notch of the sliding groove 13, causing the laser cutting head 14 to be unable to move out of the sliding groove 13, resulting in the laser cutting head 14 being stuck in the moving process, the embodiment provides another adjusting structure, that is, a horizontal opening 26 is formed on each of the opposite sides of the rotating cylinder 2, which is used to provide space for the rotation of the laser cutting head 14, and the horizontal opening 26 is in communication with the sliding groove 13, and a connecting block 27 is fixedly connected to the inner wall of the sliding groove 13, an active groove 28 is formed in the inside of the connecting block 27, a trigger block 29 is slidably connected to the inside of the active groove 28, an extrusion spring 30 is connected to the trigger block 29, one end of the extrusion spring 30 is connected to one side of the inside of the active groove 28, and a protrusion 31 is connected to the rotating shaft 24. In the embodiment, the part of the annular polishing part 15 corresponding to the horizontal opening 26 is also an opening, that is, the annular polishing part 15 includes two arc segments, and the gap between the two arc segments is the horizontal opening 26.

[0061] Specifically, a first inclined surface is formed on the trigger block 29, a second inclined surface is formed on the protrusion 31, and the second inclined surface is matched with the first inclined surface to form a wedge-shaped fit. When the rotating cylinder 2 moves axially, the trigger block 29 is brought into abutment with the protrusion 31, and continues to abut against the protrusion 31, pushing the rotating shaft 24 to rotate, driving the laser cutting head 14 to rotate, so that it moves from a horizontal state to an inclined state, thus completing the cutting of the annular protrusion and the straight-line cutting of the annular waste material remaining on the bar, so that it is cut into two and separated from the bar; when the trigger block 29 continues to move and abuts through the protrusion 31, the trigger block 29 loses abutment with the protrusion 31, so that the laser cutting head 14 is restored to the horizontal state by the resilience of the torsional spring 25, and at the same time, with the axial movement of the rotating cylinder 2, the laser cutting head 14 moves away from the annular polishing part 15 and enters the inside of the horizontal opening 26, so as to avoid in the polishing process, and at the same time, in the polishing process, the waste material generated will fall out of the horizontal opening 26 formed in the rotating cylinder 2, so that the laser cutting head 14 will not be stuck in the moving path.

[0062] Specifically, when cutting the waste material generated after cutting the annular protrusion, the trigger block 29 is abutted against the protrusion 31 by the axial movement of the rotating cylinder 2, pushing the protrusion 31 to rotate, so that the rotating shaft 24 and the laser cutting head 14 rotate synchronously, that is, from a horizontal state to an inclined state, thereby cutting the annular waste material remaining on the bar in a straight line, so that it is cut into two and separated from the bar;

[0063] When the cutting is finished, the rotating cylinder 2 continues to move axially, so that the trigger block 29 slides against the protrusion 31, and after the two lose contact, the laser cutting head 14 is driven to rotate reversely by the rebound of the torsion spring 25, so as to change from the inclined state to the horizontal state; since the laser cutting head 14 is away from the annular polishing part 15 with the axial movement of the rotating cylinder 2, the laser cutting head 14 can avoid the annular polishing part 15 during the polishing process, and the waste generated during the polishing process can fall out of the horizontal opening 26 through the rotation of the rotating cylinder 2, so that the laser cutting head 14 will not be stuck in the moving path; the rotating cylinder 2 rotates and moves axially at the same time, so as to polish the welding bumps formed after cutting;

[0064] When the polishing is finished, the rotating cylinder 2 moves reversely, so that the first inclined surface on the trigger block 29 slides against the second inclined surface on the protrusion 31, and since the elastic coefficient of the compression spring 30 is smaller than that of the torsion spring 24, the first inclined surface on the trigger block 29 presses the second inclined surface on the protrusion 31, so as to push the trigger block 29 to slide and press the compression spring 30, so that the trigger block 29 slides through the protrusion 31, and during this process, the laser cutting head 14 will not be rotated until the rotating cylinder 2 returns to the initial position.

[0065] The above only describes some exemplary embodiments of the present application by way of illustration, and it is self-evident that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the claims of the present application.

Claims

1. A constant current flash butt welding machine comprising a frame, a first welding clamping mechanism and a second welding clamping mechanism are oppositely arranged on the frame, characterized in that, The second welding clamping mechanism comprises a rotating cylinder for clamping the bar, the rotating cylinder is provided with a laser cutting mechanism, and the rotating cylinder is also provided with a polishing mechanism, the rotating cylinder has two working strokes, when the rotating cylinder is located at the first working stroke, the rotating cylinder drives the laser cutting mechanism to cut the annular protrusion formed by welding the bar, when the rotating cylinder is located at the second working stroke, the rotating cylinder drives the polishing mechanism to polish the welding flash after cutting, a fixed box is connected to the rack, the rotating cylinder is rotationally connected to the inside of the fixed box, the rotating cylinder penetrates through the fixed box and extends to the outside of the fixed box, one side of the rotating cylinder is provided with a rotating seat, the fixed box is arranged on one side of the first welding clamping mechanism, and the inside of the fixed box is provided with a through hole, the through hole penetrates through and extends to both sides of the fixed box respectively, the laser cutting mechanism comprises two sliding rods connected to the rotating seat, the inside of the rotating cylinder is provided with two sliding grooves, one end of each sliding rod penetrating through the sliding groove and extending to the outside of the rotating cylinder is provided with a laser cutting head, the laser cutting head is used for cutting the annular protrusion, and the laser cutting head is slidingly connected to the inside of the sliding groove, the fixed box is provided with a second driving unit, the second driving unit comprises a fixed ring connected to the rotating cylinder, the fixed ring is provided with an annular groove, the rack is provided with an electric cylinder, the telescopic end of the electric cylinder is connected with a pushing plate, the top of the fixed box is provided with a through groove, the pushing plate is slidingly connected to the inside of the through groove, and the pushing plate penetrates through the annular groove and extends to the inside of the annular groove, the pushing plate is rotationally connected with the annular groove, the laser cutting head is rotationally connected to the sliding rod through a rotating shaft, a torsional spring is sleeved on the outer surface of the rotating shaft, one end of the torsional spring is connected to the rotating shaft, and the other end is connected to the sliding rod, when the motor stops working, the electric cylinder is started, the pushing plate is driven to move horizontally, the laser cutting head moves out of the sliding groove, at this time, due to the limitation of the sliding groove, the laser cutting head is passively rotated through the rebound of the torsional spring.

2. A constant current flash butt welding machine according to claim 1, characterised in that, The first welding clamping mechanism comprises a sliding seat slidingly connected to the rack, a motor telescopic rod is installed on the sliding seat, a first clamp is arranged on the telescopic end of the motor telescopic rod, and a second clamp is arranged below the first clamp on the sliding seat.

3. A constant current flash butt welding machine according to claim 2, characterised in that, The rack is also provided with a hydraulic cylinder, the telescopic end of the hydraulic cylinder is connected to the sliding seat, and the rack is provided with a guide groove, the sliding seat is slidingly connected to the inside of the guide groove through a sliding block.

4. A constant current flash butt welding machine according to claim 1 wherein, The polishing mechanism comprises an annular polishing portion arranged on the end of the rotating cylinder, and the annular polishing portion is used for polishing the welding flash after cutting the annular protrusion.

5. A constant current flash butt welding machine as claimed in claim 1, wherein, A first driving unit is arranged on the rotating seat, the first driving unit comprises an annular gear arranged on the rotating seat, an electric motor is arranged on the rack through a support, a transmission gear is connected to the output shaft of the electric motor, and the transmission gear is engaged with the annular gear.

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