Constant-current flash butt welding machine

Abstract

The invention 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, and the laser cutting mechanism is used for cutting the bar. A grinding mechanism is further arranged on the rotating cylinder, and the rotating cylinder has two working strokes: when the rotating cylinder is located in the first working stroke, the rotating cylinder rotates to drive the laser cutting mechanism to cut an annular bulge formed by welding a bar; and when the rotating cylinder is located in the second working stroke, the rotating cylinder drives the grinding mechanism to grind the cut weld beading. One welding clamping mechanism is integrated with the grinding function, and the situation that the space between the two welding clamping mechanisms is small, enough space cannot be provided for grinding after welding is completed, grinding is limited, and normal grinding is affected is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of butt welding, and particularly to a constant current flash butt welder. Background Art

[0002] As is known, a constant current flash butt welder is a device that uses the heat generated by an electric current passing through the workpieces for welding, and a more stable welding process is achieved through constant current control technology. Among them, during the flash butt welding process of bars, generally, two sets of welding clamping mechanisms are required to clamp the ends of two bars, and then the two sets of welding clamping mechanisms are fed synchronously for butt joint to complete the butt welding operation of the bars.

[0003] The patent application document with the application number CN202311595933.5, the application date of November 28, 2023, and the title of "A Butt Welding Device with a Welding Joint Shaping Function and Its Usage Method" includes a base; a butt welding assembly and a straightening assembly are installed on the top of the base, and a grinding assembly is installed at the upper end of the side wall of the base; the top of the base is fixedly connected to the bottom of a control box, and a chute for the limited sliding connection of a slag receiving drawer is opened at the lower end of the side wall of the base, and the slag receiving drawer is located below the butt welding assembly; the butt welding assembly includes a welding assembly and a sliding assembly; a welding assembly and a sliding assembly are installed on the top of the base, and the welding assembly is connected to the sliding assembly. In this way, in this patent, the workpiece is clamped and extruded by the welding assembly, which can narrow the fusion part of the workpiece, facilitate grinding, and by using the method of making the workpiece impact the fixture, the excess metal on the outer ring of the welding joint falls off, saving the grinding time and improving the work efficiency.

[0004] In the prior art, after welding is completed, the next process, that is, grinding treatment, needs to be carried out. In the above-mentioned comparative document, when welding is completed, the welding position is directly ground. However, due to the small space between the two sets of welding clamping mechanisms, thus, insufficient space for grinding cannot be provided after welding is completed, resulting in limited grinding and affecting the normal progress of grinding. Summary of the Invention

[0005] The purpose of the present invention is to provide a constant current flash butt welder to solve the above problems in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A constant current flash butt welding machine, comprising a frame, on which a first welding clamping mechanism and a second welding clamping mechanism are oppositely arranged. The second welding clamping mechanism includes a rotating cylinder for clamping a bar. A laser cutting mechanism is arranged on the rotating cylinder, and a grinding 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 rotates to drive 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 grinding mechanism to grind the cut weld bead.

[0008] For the above-mentioned constant current flash butt welding machine, the first welding clamping mechanism includes a sliding seat slidably connected to the frame. An electric telescopic rod is installed on the sliding seat. A first clamp is arranged on the telescopic end of the electric telescopic rod. A second clamp is arranged on the sliding seat and below the first clamp.

[0009] For the above-mentioned constant current flash butt welding machine, a hydraulic cylinder is further arranged on the frame. The telescopic end of the hydraulic cylinder is connected to the sliding seat. A guide groove is opened on the frame. The sliding seat is slidably connected to the inside of the guide groove through a slider.

[0010] For the above-mentioned constant current flash butt welding machine, a fixed box is connected to the frame. The rotating cylinder is rotatably 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. A rotating seat is arranged on one side of the rotating cylinder.

[0011] For the above-mentioned 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 opened in the inside of the fixed box. The through hole penetrates through and extends to both sides of the fixed box.

[0012] For the above-mentioned constant current flash butt welding machine, the laser cutting mechanism includes two sliding rods connected to the rotating seat. Two sliding grooves are opened in the inside of the rotating cylinder. Each sliding rod penetrates through the sliding groove and a laser cutting head is arranged at the end extending to the outside of the rotating cylinder. The laser cutting head is used to cut the annular protrusion, and the laser cutting head is slidably connected to the inside of the sliding groove.

[0013] For the above-mentioned constant current flash butt welding machine, the grinding mechanism includes an annular grinding part opened at the end of the rotating cylinder. The annular grinding part is used to grind the weld bead after cutting the annular protrusion.

[0014] For the above-mentioned constant current flash butt welder, a first driving unit is arranged on the rotating seat. The first driving unit includes an annular gear arranged on the rotating seat. A motor is arranged on the frame through a bracket. A transmission gear is connected to the output shaft of the motor. The transmission gear meshes with the annular gear.

[0015] For the above-mentioned constant current flash butt welder, a second driving unit is arranged on the fixed box. The second driving unit includes a fixed ring connected to the rotating cylinder. An annular groove is formed on the fixed ring.

[0016] For the above-mentioned constant current flash butt welder, an electric cylinder is arranged on the frame. The telescopic end of the electric cylinder is connected with a pushing plate. A through groove is formed at the top of the fixed box. The pushing plate is slidably connected to the inside of the through groove and penetrates through the annular groove and extends to the inside of the annular groove. Thus, the pushing plate is rotationally connected with the annular groove.

[0017] In the above technical solution, for the constant current flash butt welder provided by the present invention, by integrating the grinding function into one of the two welding clamping mechanisms, it is avoided that the space between the two welding clamping mechanisms is too small, so that there is not enough space for grinding after welding is completed, resulting in limited grinding and affecting the normal progress of grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0019] Figure 1 It is a schematic structural diagram of a constant current flash butt welder provided by an embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of a constant current flash butt welder provided by an embodiment of the present invention from another perspective;

[0021] Figure 3 It is a schematic structural diagram of a constant current flash butt welder provided by an embodiment of the present invention from another perspective;

[0022] Figure 4 For Figure 3 it is a schematic cross-sectional structure diagram of the fixed box in

[0023] Figure 5 It is a schematic structural diagram of another embodiment of a constant current flash butt welder provided by an embodiment of the present invention;

[0024] Figure 6 ForFigure 5 Structural schematic diagram of another perspective of the middle laser cutting head;

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

[0026] Figure 8 is Figure 7 Local enlarged schematic diagram at position A in

[0027] Figure 9 is Figure 8 Cross-sectional structural schematic diagram of the connecting block in

[0028] Explanation of reference numerals:

[0029] 1. Frame; 2. Rotating cylinder; 3. Sliding seat; 4. Electric telescopic rod; 5. First fixture; 6. Second fixture; 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 grinding part; 16. Ring gear; 17. Driving gear; 18. Fixed ring; 19. Annular groove; 20. Electric cylinder; 21. Pushing plate; 22. Through slot; 23. Motor; 24. Rotating shaft; 25. Torsion spring; 26. Horizontal opening; 27. Connecting block; 28. Moving groove; 29. Trigger block; 30. Compression spring; 31. Convex block. Detailed implementation manners

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

[0031] As Figures 1-9 shown, a constant current flash butt welding machine provided in this embodiment includes a frame 1. A first welding clamping mechanism and a second welding clamping mechanism are oppositely arranged on the frame 1. The second welding clamping mechanism includes a rotating cylinder 2 for clamping a bar. A laser cutting mechanism is arranged on the rotating cylinder 2, and a grinding mechanism is also arranged on the rotating cylinder 2. The rotating cylinder 2 has two working strokes: when the rotating cylinder 2 is in the first working stroke, it rotates to drive 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 grinding mechanism to grind the cut weld bead.

[0032] Specifically, the frame 1 is a main structure and is arranged vertically. A processing table is arranged on the frame 1; a plurality of support legs are arranged at the bottom of the processing table, and the plurality of support legs are all fixed on a fixed foundation such as the ground; the first welding clamping mechanism and the second welding clamping mechanism are oppositely arranged on the vertical side wall of the frame 1, as Figure 1As shown, the first welding clamping mechanism is located on the right side of the second welding clamping mechanism;

[0033] The first welding clamping mechanism includes a sliding seat 3 slidably connected to the frame 1. An electric telescopic rod 4 is installed on the sliding seat 3. A first clamp 5 is provided at the telescopic end of the electric telescopic rod 4. A second clamp 6 is provided on the sliding seat 3 and below the first clamp 5. A hydraulic cylinder 7 is also provided on the frame 1. The telescopic end of the hydraulic cylinder 7 is connected to the sliding seat 3. A plurality of guide grooves 8 are formed on the frame 1. The sliding seat 3 is slidably connected to the two guide grooves 8 through two sliders in one-to-one correspondence. It should be noted that the working direction of the sliding seat 3 is to move horizontally, that is, to drive the entire first welding clamping mechanism to move horizontally and approach the second welding clamping mechanism, so that the end of one bar is close to the end of the other bar, thereby facilitating the welding operation. In this embodiment, the electric telescopic rod 4 is arranged vertically, and the electric telescopic rod 4 is used to push the first clamp 5 to move in the vertical direction. The working directions of the first clamp 5 and the second clamp 6 are both in the vertical direction, so as to realize the clamping of the bar;

[0034] A flash welding mechanism (prior art, not shown in the figure) is also provided on the frame 1. The flash welding mechanism is arranged between the first welding clamping mechanism and the second welding clamping mechanism. The flash welding mechanism includes a welding head. The welding head is provided on the frame 1. Through the welding current generated by the welding head, the welding current passes through the bar to generate resistance heat, so that the end face of the bar is gradually heated and melted to form a flash. During the flash process, the metal at the end face of one bar on the first welding clamping mechanism and the end face of the other bar on the second welding clamping mechanism melts and sprays to form a liquid metal overbeam. Then, the entire first welding clamping mechanism slides horizontally on the frame 1 to bring the welding end face of one bar close to and press against the welding end face of the other bar. In this way, the liquid metal and oxides at the welding end faces of the two bars are extruded, and the solid metals at the end faces of the two bars are in close contact to form a firm joint (ring-shaped protrusion); and the above are all prior arts and will not be elaborated.

[0035] The innovation of this embodiment lies in that the second welding clamping mechanism includes a rotating cylinder 2 for clamping the bar. A laser cutting mechanism is provided on the rotating cylinder 2. A grinding mechanism is also provided on the rotating cylinder 2. 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 ring-shaped protrusion formed by welding the bar; when the rotating cylinder 2 is in the second working stroke, it drives the grinding mechanism to grind the cut weld bead.

[0036] Specifically, a fixed box 9 is provided on the frame 1. The fixed box 9 serves as the installation base for the rotating cylinder 2. The rotating cylinder 2 is rotatably 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. A rotating seat 10 is provided at the other end of the rotating cylinder 2.

[0037] A laser cutting mechanism is provided on the rotating cylinder 2. The laser cutting mechanism includes two sliding rods 12 connected to the rotating seat 10. Two sliding grooves 13 are axially formed on the cylinder body of the rotating cylinder 2. Each sliding rod 12 penetrates through the sliding groove 13 and extends to the outside of the rotating cylinder 2. A laser cutting head 14 is provided at the end extending outside the rotating cylinder 2. The laser cutting head 14 is used to emit laser to cut the annular protrusion, and the laser cutting head 14 is slidably connected to the sliding groove 13.

[0038] A grinding mechanism is further provided on the rotating cylinder 2. The grinding mechanism is an annular grinding part 15 connected to the end of the rotating cylinder 2. The annular grinding part 15 is used to grind the weld bead after cutting the annular protrusion. A first driving unit is provided on the rotating seat 10. The first driving unit includes an annular gear 16 provided on the rotating seat 10. A motor 23 is provided on the frame 1 through a bracket. A transmission gear 17 is connected to the output shaft of the motor 23. The transmission gear 17 meshes with the annular gear 16.

[0039] A second driving unit is provided on the fixed box 9. The second driving unit includes a fixed ring 18 connected to the rotating cylinder 2. An annular groove 19 is formed on the fixed ring 18. An electric cylinder 20 is provided on the frame 1. The telescopic end of the electric cylinder 20 is connected to a pushing plate 21. A through groove 22 is formed at the top of the fixed box 9. The pushing plate 21 is slidably 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. In this way, the pushing plate 21 is rotatably connected to the annular groove 19.

[0040] Specifically, the fixing box 9 is arranged on one side of the first welding clamping mechanism, and a through hole 11 is opened inside the fixing box 9, and the through holes 11 respectively penetrate and extend to both sides of the fixing box 9, wherein the rotating seat 10 is rotatably connected to one side of the fixing box 9; the rotating cylinder 2 is rotatably connected to the other side of the fixing box 9, and the distance between the rotating seat 10 and the rotating cylinder 2 can be adjusted by the axial movement of the rotating cylinder. At the same time, the rotating seat 10 and the rotating cylinder 2 are both cylinders with the same inner diameter. When the rod is first inserted into the rotating cylinder 2 until it is inserted into the rotating seat 10, the position of the rod is limited by the vertical bottom wall of the rotating seat 10, so that the rod can no longer be horizontally moved. Sliding in the direction, so that when the first welding clamping mechanism clamps a rod and another rod for butt welding, the other rod is limited by the rotating seat 10 so that it cannot move axially, thereby completing the pre-limiting preparation operation before butt welding between the two rods; it should be noted that a plurality of balls (not shown in the figure) are preferably arranged inside the rotating cylinder 2, so that when the rod is inserted into the interior of 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 will not rotate with it, but will be in a stationary state, so that after the butt welding is completed, the rotation of the rotating cylinder 2 facilitates the cutting of the annular protrusion generated on the rod and the subsequent grinding operation;

[0041] The rotating seat 10 and the rotating cylinder 2 are connected by a sliding rod 12. In order to improve the stability of the transmission, several more rods can be optionally provided for transmission. The two ends of the rod are respectively connected to the rotating seat 10 and the rotating cylinder 2, and at least one end of the rod is slidable. In this way, when the rotating seat 10 rotates, the rotating cylinder 2 is also driven to rotate passively, thereby realizing the synchronous rotation of the two, that is, driving the laser cutting head 14 at the end of the rotating cylinder 2 to rotate, so as to rotate (annular) cut the annular protrusions of the two rods in the welding stroke; it should be noted that the sliding groove 13 The notch is adapted to the diameter of the laser cutting head 14, so that when the rotating cylinder 2 slides horizontally to enter the grinding position, the laser cutting head 14 can slide into the interior of the sliding groove 13, so that the annular grinding portion 15 at the end of the rotating cylinder 2 is not blocked by the laser cutting head 14, and is fully displayed; in this embodiment, an annular bevel is provided on the annular grinding portion 15 as a grinding surface, and the annular bevel grinds the weld nodule formed after the annular protrusion is cut, so that the weld nodule after grinding can smoothly enter the interior of the rotating cylinder 2, that is, the volume of the weld nodule after grinding meets the production requirements;

[0042] In this embodiment, the ring gear 16 meshes with the transmission gear 17. In this way, by driving the rotation of the ring gear 16, the rotating seat 10 and the rotating cylinder 2 are driven to rotate synchronously inside the fixed box 9, so that the laser cutting head 14 also rotates synchronously, thereby rotating and cutting the annular protrusion formed by butt-welding the two bars;

[0043] The end of the push plate 21 is adapted to the annular groove 19. When the rotating cylinder 2 rotates, the end of the push plate 21 slides inside the annular groove 19. At the same time, when the electric cylinder 20 is started, the push plate 21 is driven to move horizontally, driving the rotating cylinder 2 to move horizontally while maintaining a rotating state. In this way, the annular grinding part 15 on the rotating cylinder 2 is driven to approach and abut against the weld bead formed after cutting, so as to perform a grinding operation on 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. In this way, the annular protrusion formed by butt-welding the two bars is rotationally cut;

[0046] When the rotating cylinder 2 is in the second working stroke, that is, during the rotation of the rotating cylinder 2, it is simultaneously driven to move horizontally, so that the annular grinding part 15 at the end of the rotating cylinder 2 abuts against the weld bead after cutting, so as to grind it;

[0047] Specifically, when switching from the first working stroke to the second working stroke, by starting the electric cylinder 20, the push plate 21 is driven to slide horizontally, thereby pushing the rotating cylinder 2 to slide horizontally while rotating. During this process, the annular protrusion formed by butt-welding the two bars is cut and the weld bead after cutting is ground;

[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 place the positions of the two bars. Insert one bar into the inside of the rotating cylinder 2 and continue to push until the bar enters the inside of the rotating seat 10 (at this time, the bar cannot be pushed again). Then place the other bar on the second fixture 6. By starting the electric telescopic rod 4, the first fixture 5 moves downward to clamp and fix the other bar. Then by starting the hydraulic cylinder 7, the sliding seat 3 is pushed to slide on the frame 1, thereby driving the end of one bar to approach the end of the other bar. During this process, by starting the flash mechanism, the end faces of the two bars are gradually heated and melted, and as they approach each other, the end faces of the two bars are welded together, and during the welding process, an annular protrusion is formed;

[0049] When cutting the annular protrusion, by starting the motor 23, the driving 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, that is, driving the laser cutting head 14 to rotate. Start the laser cutting head 14 to cut the annular protrusion;

[0050] When grinding after cutting is completed, during the rotation of the rotating cylinder 2 as described above, that is, driving the push plate 21 to move relatively inside the annular groove 19. When the electric cylinder 20 is started, it drives the push plate 21 to move horizontally. In this way, the rotating cylinder 2 rotates and moves horizontally at the same time, so as to drive the annular grinding part 15 to approach and abut against the weld bead formed after cutting, so as to perform grinding operations on it.

[0051] The beneficial effect of this embodiment is that by integrating the grinding function into one of the welding clamping mechanisms, it is avoided that the space between the two welding clamping mechanisms is small. In this way, after welding, there is not enough space for grinding, resulting in limited grinding and affecting the normal progress of grinding.

[0052] Further, please refer to Figures 5-6 As shown, after cutting the annular protrusion, the shape of the waste material generated after cutting is also annular and is sleeved on the surface of the rod, which is not convenient for subsequent processing.

[0053] Thus, based on the above description, in order to prevent the waste material after cutting from remaining on the surface of the rod, this embodiment provides an adjusting structure. The laser cutting head 14 is rotatably connected to the sliding rod 12 through a rotating shaft 24. A torsion spring 25 is sleeved on the outer surface of the rotating shaft 24. 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 this 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, in a horizontal state arrangement, the annular protrusion is cut by the rotation of the laser cutting head 14;

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

[0057] Specifically, during cutting, by starting the motor 23, the driving 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 at the same time driving the laser cutting head 14 to rotate, so as to cut the annular protrusion. At this time, the waste material generated after cutting the annular protrusion is also annular and sleeved on the surface of the bar. At this time, stop the motor 23 and start the electric cylinder 20, drive the push plate 21 to move horizontally, and its 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 loss of the limit of the sliding groove 13, through the rebound of the torsion spring 25, the laser cutting head 14 is rotated passively, that is, it tilts and swings, so as to perform a straight-line cutting on the annular waste material staying on the bar, cut it into two parts, and fall off and separate from the bar under the action of gravity;

[0058] After the cutting is completed, start the electric cylinder 20 again, drive the push plate 21 to move horizontally in the reverse direction, and through the guidance of the annular grinding part 15, make the laser cutting head 14 slide into the inside of the sliding groove 13. During this process, the laser cutting head 14 moves from an inclined state to a horizontal state, so as to perform the next annular cutting operation.

[0059] Further, please refer to Figures 7-9 , during the above grinding process, the rotating cylinder 2 rotates and moves horizontally at the same time, so that the annular grinding part 15 approaches and abuts against the weld bead formed after cutting, so as to perform a grinding operation on it. However, when the annular grinding part 15 is grinding, the waste chips generated by it are easily introduced into the slot opening of the sliding groove 13 on the annular grinding part 15. Thus, the laser cutting head 14 cannot move out of the sliding groove 13, that is, the laser cutting head 14 is stuck during movement.

[0060] Thus, based on the above description, in order to prevent the waste chips generated by grinding from entering the slot of the sliding slot 13, which may cause the laser cutting head 14 to be unable to move out of the sliding slot 13 and result in jamming during the movement of the laser cutting head 14, the present embodiment provides another adjustment structure. A horizontal opening 26 is provided on each of the opposite sides of the rotating cylinder 2. The horizontal opening 26 is used to provide a space for the rotation of the laser cutting head 14, and the horizontal opening 26 communicates with the sliding slot 13. A connecting block 27 is fixedly connected to the inner wall of the sliding slot 13. An activity slot 28 is provided inside the connecting block 27. A trigger block 29 is slidably connected inside the activity slot 28. A compression spring 30 is connected to the trigger block 29. One end of the compression spring 30 is connected to one side inside the activity slot 28. A convex block 31 is connected to the rotating shaft 24. In the present embodiment, the part of the annular grinding portion 15 corresponding to the horizontal opening 26 is also open, that is, the annular grinding portion 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 provided on the trigger block 29, and a second inclined surface is provided on the convex block 31. The second inclined surface and the first inclined surface are adapted to form a wedge fit. When the rotating cylinder 2 moves axially, it drives the trigger block 29 to abut against the convex block 31 and continue to abut against the convex block 31, pushing the rotating shaft 24 to rotate, driving the laser cutting head 14 to rotate, so that it moves from the horizontal state to the inclined state. In this way, the cutting of the annular protrusion and the linear cutting of the annular waste staying on the bar are completed, and it is cut into two parts and separated from the bar; when the trigger block 29 continues to move and passes through the convex block 31 by abutting, since the trigger block 29 and the convex block 31 lose abutment, thus, through the resilience of the torsion spring 25 itself, the laser cutting head 14 is restored to the horizontal state. At the same time, with the axial movement of the rotating cylinder 2, the laser cutting head 14 moves away from the annular grinding portion 15 and enters the horizontal opening 26. In this way, it can avoid during the grinding process. At the same time, during the grinding process, the generated waste will fall out from the opened horizontal opening 26 through the rotation of the rotating cylinder 2. In this way, it will not cause jamming of the laser cutting head 14 during the movement path.

[0062] Specifically, when cutting the waste generated after cutting the annular protrusion, through the axial movement of the rotating cylinder 2, the trigger block 29 abuts against the convex block 31, pushing the convex block 31 to rotate. In this way, the rotating shaft 24 and the laser cutting head 14 rotate synchronously, that is, they change from the horizontal state to the inclined state, so as to perform linear cutting on the annular waste staying on the bar, cut it into two parts and separate it from the bar;

[0063] After the cutting is completed, the rotating cylinder 2 continues to move axially, causing the trigger block 29 to slide and abut against and pass through the convex block 31. After the two lose contact, due to the rebound of the torsion spring 25, the laser cutting head 14 is driven to rotate in the reverse direction passively, thus changing from an inclined state to a horizontal state; as the rotating cylinder 2 moves axially, the laser cutting head 14 moves away from the annular grinding part 15, so as to avoid during the grinding process. At the same time, during the grinding process, the generated waste will fall out from the opened horizontal opening 26 through the rotation of the rotating cylinder 2. In this way, it will not cause jamming of the laser cutting head 14 during the moving path. By rotating and axially moving the rotating cylinder 2 at the same time, the bead formed after cutting is thus ground.

[0064] After the grinding is completed, through the reverse axial movement of the rotating cylinder 2, the sliding contact between the first inclined surface on the trigger block 29 and the second inclined surface on the convex block 31 is driven. Since the elastic coefficient of the compression spring 30 is less than that of the torsion spring 24, thus, the first inclined surface on the trigger block 29 squeezes the second inclined surface on the convex block 31, thereby pushing the trigger block 29 to slide forcedly to compress the compression spring 30. In this way, the trigger block 29 slides through the convex block 31, and during this process, it will not push the laser cutting head 14 to rotate until the rotating cylinder 2 returns to the initial position.

[0065] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. 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 invention.

Claims

1. A constant current flash butt welding machine, comprising a frame, wherein 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 includes a rotating cylinder for clamping the bar. A laser cutting mechanism is provided on the rotating cylinder, and a grinding mechanism is also provided on the rotating cylinder. The rotating cylinder has two working strokes: When the rotating cylinder is in the first working stroke, it rotates to drive the laser cutting mechanism to cut the annular protrusion formed by bar welding. When the rotating cylinder is in the second working stroke, it drives the grinding mechanism to grind the weld bead after cutting.

2. The constant current flash butt welding machine according to claim 1, characterized in that, The first welding clamping mechanism includes a sliding seat slidably connected to the frame. An electric telescopic rod is installed on the sliding seat. A first clamp is provided at the telescopic end of the electric telescopic rod. A second clamp is provided on the sliding seat and below the first clamp.

3. The constant current flash butt welding machine according to claim 2, characterized in that, A hydraulic cylinder is also provided on the frame. The telescopic end of the hydraulic cylinder is connected to the sliding seat. A guide groove is formed on the frame. The sliding seat is slidably connected to the inside of the guide groove through a slider.

4. A constant current flash butt welding machine according to claim 1, characterized in that, A fixed box is connected to the frame. The rotating cylinder is rotatably 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. A rotating seat is provided on one side of the rotating cylinder.

5. The constant current flash butt welding machine according to claim 4, characterized in that, The fixed box is provided on one side of the first welding clamping mechanism, and a through hole is formed inside the fixed box. The through hole penetrates through and extends to both sides of the fixed box.

6. The constant current flash butt welding machine according to claim 5, characterized in that, The laser cutting mechanism includes two sliding rods connected to the rotating seat. Two sliding grooves are formed inside the rotating cylinder. Each sliding rod penetrates through the sliding groove and a laser cutting head is provided at the end extending to the outside of the rotating cylinder. The laser cutting head is used to cut the annular protrusion, and the laser cutting head is slidably connected to the inside of the sliding groove.

7. A constant current flash butt welding machine according to claim 1, characterized in that, The grinding mechanism includes an annular grinding part formed at the end of the rotating cylinder. The annular grinding part is used to grind the weld bead after cutting the annular protrusion.

8. The constant current flash butt welding machine according to claim 1, wherein A first driving unit is provided on the rotating seat. The first driving unit includes an annular gear provided on the rotating seat. A motor is provided on the frame through a bracket. A transmission gear is connected to the output shaft of the motor. The transmission gear meshes with the annular gear.

9. The constant current flash butt welding machine according to claim 1, characterized in that, A second driving unit is provided on the fixed box. The second driving unit includes a fixed ring connected to the rotating cylinder. An annular groove is formed on the fixed ring.

10. A constant current flash butt welding machine according to claim 9, characterized in that, An electric cylinder is provided on the frame. A push plate is connected to the telescopic end of the electric cylinder. A through slot is formed at the top of the fixed box. The push plate is slidably connected to the inside of the through slot, and the push plate penetrates through the annular groove and extends to the inside of the annular groove. In this way, the push plate is rotatably connected to the annular groove.

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