A submerged arc welding equipment for large steel pipe production

Abstract

The present invention relates to the field of welding technology, and in particular to a submerged arc welding device for large steel pipe production, comprising a submerged arc welding machine, a flux funnel is arranged at the front side of the welding gun of the submerged arc welding machine, a flux recovery module is arranged at the rear side of the welding gun of the submerged arc welding machine, the flux recovery module comprises a fixed cylinder, a rotating shaft is coaxially arranged in the fixed cylinder, a motor is connected to the rotating shaft transmission, a plurality of blades are arranged circumferentially on the surface of the rotating shaft, a feed port is provided on the lower circumferential surface of the fixed cylinder, a feed shovel is fixed to the feed port; a discharge port is provided on the upper end surface of the fixed cylinder, a feeder is connected to the discharge port, and the feeder is connected to the welding funnel. The present invention can recover the residual flux on the surface of the weld after welding and then input it into the weld to be welded, and use the residual waste heat to heat the flux, thereby reducing the energy required for preheating the flux.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a submerged arc welding device used for the production of large steel pipes. Background Art

[0002] In the production process of large steel pipes, after the steel plate is bent into a cylindrical shape, the joints between the two ends of the steel plate need to be welded together. The existing welding method mainly uses submerged arc welding equipment for welding. When the existing submerged arc welding equipment is used, the welding wire is fed into the welding gun by the wire feeding mechanism. After passing through the welding gun, the end of the welding wire slightly contacts the weldment, and the flux flows out from the flux funnel mouth and is evenly deposited on the welded part. After the arc is struck, the arc melts the surrounding flux, a part of which reaches the boiling point and evaporates to form high-temperature gas. This part of the vapor pushes away the melted flux around the arc to form an arc cavity, isolating the arc from the outside air. The arc burns in this cavity, and the welding wire continuously melts and transitions to the molten pool. In the above welding process, if the ambient temperature is low, the flux temperature is low, so that the arc can melt less flux in a short time, which will cause the welding efficiency to deteriorate. Therefore, the flux needs to be preheated. The preheated flux can melt faster, accelerate the welding speed, and improve production efficiency. The existing flux preheating method mainly relies on adding an additional heating device to the flux supply device to heat the welding temperature. In the production process of large steel pipes, due to the large length and width of the joints, a large amount of flux is required. Therefore, the heating device consumes more energy during the preheating process, resulting in high energy consumption for welding. Summary of the invention

[0003] The purpose of the present invention is to solve the disadvantage of the prior art that the preheating flux consumes more energy, and to propose a submerged arc welding device for the production of large steel pipes.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A submerged arc welding device for large steel pipe production is designed, comprising a submerged arc welding machine, a flux funnel is arranged at the front side of the welding gun of the submerged arc welding machine, a flux recovery module is arranged at the rear side of the welding gun of the submerged arc welding machine, the flux recovery module is fixed on the submerged arc welding machine, and the flux recovery module is connected to the welding funnel;

[0006] The flux recovery module includes a fixed cylinder, a feed shovel, a rotating shaft, blades, a discharge port, and a feeder. The fixed cylinder is coaxially provided with a rotating shaft, the rotating shaft is transmission-connected with a motor, a plurality of blades are circumferentially provided on the surface of the rotating shaft, the blades are axially inclined and fixed on the surface of the rotating shaft, the outer edges of the blades are in contact with the inner wall of the fixed cylinder, a feed port is provided on the lower circumferential surface of the fixed cylinder, a feed shovel is fixed to the feed port, the feed shovel is used to extend into the weld to shovel out the flux in the weld; a discharge port is provided on the upper end surface of the fixed cylinder, the discharge port is connected with a feeder, and the feeder is connected to the welding funnel.

[0007] Preferably, a heat exchanger is fixed to the lower surface of the feed shovel, and the heat exchanger is used to absorb the residual heat in the weld. A liquid storage cavity is opened inside the heat exchanger, and the liquid storage cavity is used to store heat transfer liquid. The heat exchanger is provided with an inlet pipe and an outlet pipe connected to the liquid storage cavity. A flow channel is opened in the inner wall of the feeder, and the feeder is provided with an outlet pipe and an inlet pipe connected to the flow channel. The outlet pipe of the flow channel is connected to the inlet pipe, and the inlet pipe and the liquid outlet pipe of the flow channel are connected through a circulation module.

[0008] Preferably, the circulation module includes a cylinder body, the open end of the cylinder body is arranged toward the side away from the fixed cylinder, a suction pipe and a discharge pipe are circumferentially arranged on the outer surface of the cylinder body, and a one-way valve is arranged in the suction pipe and the discharge pipe, the suction pipe is connected to the outlet pipe, and the discharge pipe is connected to the inlet pipe of the flow channel, a piston is telescopically installed in the cylinder body, the piston is made of ferromagnetic material, and a plurality of magnetic blocks are embedded and fixed on the surface of the rotating shaft along the circumferential direction, and the magnetic blocks and the piston attract each other.

[0009] Preferably, a striking head fixedly connected to the piston is further provided outside the cylinder body.

[0010] Preferably, the heat exchanger is in the shape of a right triangle, and the hypotenuse surface of the heat exchanger is attached to the lower surface of the shovel body.

[0011] Preferably, the feeder comprises a connecting cover and a feed chute, wherein the connecting cover is arranged on the discharge port, the lower part of the connecting cover is connected with the feed chute, and the feed chute is arranged to be inclined toward the direction of the flux funnel as a whole.

[0012] Preferably, a plurality of protruding columns are fixed on the bottom surface of the conveying slideway.

[0013] The invention provides a submerged arc welding device for large steel pipe production, which has the following beneficial effects:

[0014] By arranging a flux recovery module at the rear side of the welding gun, the residual flux at the completed weld can be recovered and reapplied on the unwelded weld. Since the flux absorbs the heat generated during the welding process, it is easier to be melted by the arc.

[0015] By setting a heat exchanger, the heat exchanger is used to absorb the residual heat in the weld, and a heat transfer fluid that can circulate between the heat exchanger and the feeder is provided, so that the heat absorbed by the heat exchanger can be quickly transferred to the feeder, thereby increasing the temperature of the feeder to further heat the flux flowing inside it;

[0016] By arranging a knocking body connected to the piston on the circulation module, the knocking body can be used to automatically knock the slag shell remaining on the weld when the piston drives the heat transfer fluid to circulate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a submerged arc welding device for large steel pipe production proposed by the present invention;

[0018] Figure 2 Schematic diagram of the structure of a flux recovery module for submerged arc welding equipment used in large steel pipe production proposed by the present invention Figure 1 ;

[0019] Figure 3 Schematic diagram of the structure of a flux recovery module for submerged arc welding equipment used in large steel pipe production proposed by the present invention Figure 2 ;

[0020] Figure 4 Schematic diagram of the structure of a flux recovery module for submerged arc welding equipment used in large steel pipe production proposed by the present invention Figure 3 ;

[0021] Figure 5 A schematic diagram of the pipeline connection between the heat exchanger, the cylinder body and the conveying slideway in a flux recovery module of a submerged arc welding device for large steel pipe production proposed by the present invention;

[0022] Figure 6 A schematic cross-sectional view of a feed chute of a submerged arc welding device for large steel pipe production proposed by the present invention;

[0023] Figure 7 This is a schematic diagram of the interior of a fixed cylinder of a submerged arc welding device for large steel pipe production proposed by the present invention;

[0024] Figure 8 This is a schematic cross-sectional structure diagram of a fixed cylinder of a submerged arc welding device for large steel pipe production proposed by the present invention;

[0025] Fig. 9 This is a schematic diagram of blade distribution of a submerged arc welding device for large steel pipe production proposed by the present invention.

[0026] In the figure: 1. fixed cylinder; 2. feeding shovel; 3. rotating shaft; 4. blades; 5. discharge port; 6. connecting cover; 7. feeding slide; 8. flux funnel; 9. heat exchange body; 10. liquid storage chamber; 11. liquid outlet pipe; 12. liquid inlet pipe; 13. flow channel; 14. inlet pipe; 15. outlet pipe; 16. cylinder body; 17. piston; 18. knocking body; 19. liquid suction pipe; 20. liquid discharge pipe; 21. magnetic block; 22. welding gun; 23. motor. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Example 1: Reference Figure 1-4 8, 9, a submerged arc welding device for large steel pipe production, including a submerged arc welding machine, a flux funnel 8 is arranged on the front side of the welding gun 22 of the submerged arc welding machine, a flux recovery module is arranged on the rear side of the welding gun 22 of the submerged arc welding machine, the flux recovery module is fixed on the submerged arc welding machine, and the flux recovery module is connected to the welding funnel; the welding gun 22 is a prior art, which is connected to a flux supply device, which will automatically discharge the flux to cover the weld during welding.

[0029] The flux recovery module includes a fixed cylinder 1, a feed shovel 2, a rotating shaft 3, blades 4, a discharge port 5, and a feeder. The fixed cylinder 1 is coaxially provided with a rotating shaft 3, which is connected to a motor 23 in a transmission manner. The surface of the rotating shaft 3 is provided with a plurality of blades 4 along the circumferential direction. The blades 4 are fixed on the surface of the rotating shaft 3 along the axial direction. The outer edges of the blades 4 are in contact with the inner wall of the fixed cylinder 1. A feed port is provided on the lower circumferential surface of the fixed cylinder 1. A feed shovel 2 is fixed on the feed port. The feed shovel 2 is used to extend into the weld to shovel out the flux in the weld. A discharge port 5 is provided on the upper end surface of the fixed cylinder 1. A feeder is connected to the discharge port 5, and the feeder is connected to the welding funnel. The flux recovery module can scoop up the residual flux at the weld after welding, and then input it back into the welding funnel. The flux itself absorbs heat during the welding process and has a higher temperature. Therefore, after covering the joint, it can be more easily melted by the arc. In addition, the welding gun 22 itself is connected to a flux supply device, and the flux discharged from the welding gun 22 will cover the surface of the recovered flux discharged from the welding funnel, so as to compensate for the loss of the flux recovery module caused by the melting of the flux during the recovery process.

[0030] The feeder comprises a connecting cover 6 and a feeding chute 7 . The connecting cover 6 is disposed on the discharge port 5 . The lower part of the connecting cover 6 is connected with the feeding chute 7 . The feeding chute 7 is disposed obliquely toward the direction of the flux hopper 8 as a whole.

[0031] A plurality of protrusions are fixed on the bottom surface of the conveying chute 7. When the flux slides along the conveying chute 7, in order to allow the flux to obtain more contact area and time for heat exchange with the conveying chute 7, the protrusions are provided to slow down the sliding speed of the flux and increase its contact area with the conveying chute 7.

[0032] Example 2: Reference Figure 5-7 As another preferred embodiment of the present invention, the difference from the embodiment 1 is that a heat exchanger 9 is fixed to the lower surface of the feed shovel 2. The heat exchanger 9 is in the shape of a right triangle, and the hypotenuse of the heat exchanger 9 is attached to the lower surface of the shovel body. The heat exchanger 9 is used to absorb the residual heat in the weld. A liquid storage cavity 10 is provided inside the heat exchanger 9. A plurality of partitions are provided in the liquid storage cavity 10 to form a U-shaped loop in the liquid storage cavity 10. The liquid inlet pipe 12 and the liquid outlet pipe 11 are respectively provided at both ends of the U-shaped loop so that the heat transfer liquid can be retained in the liquid storage cavity 10 for a sufficient time. The liquid storage chamber 10 is used to store heat transfer liquid. The heat exchanger 9 is provided with a liquid inlet pipe 12 and a liquid outlet pipe 11 connected to the liquid storage chamber 10. A flow channel 13 is opened in the inner wall of the feeder. The feeder is provided with an outlet pipe 15 and an inlet pipe 14 connected to the flow channel 13. The outlet pipe 15 of the flow channel 13 is connected to the liquid inlet pipe 12, and the inlet pipe 14 of the flow channel 13 is connected to the liquid outlet pipe 11 through a circulation module. Furthermore, the heat exchanger 9 is used to absorb the residual heat in the weld, and with the heat transfer liquid that can circulate between the heat exchanger 9 and the feeder, the heat absorbed by the heat exchanger 9 can be quickly transferred to the feeder, so that the temperature of the feeder is increased to further preheat the flux flowing inside it. The flow channel 13 is serpentine, and the serpentine flow channel can better allow the heat of the heat transfer liquid to be absorbed by the feeder.

[0033] The circulation module includes a cylinder body 16, the open end of the cylinder body 16 is arranged to face the side away from the fixed cylinder 1, and a suction pipe 19 and a discharge pipe 20 are circumferentially arranged on the outer surface of the cylinder body 16. A one-way valve is arranged in the suction pipe 19 and the discharge pipe 20. The suction pipe 19 is connected to the outlet pipe 11, and the discharge pipe 20 is connected to the inlet pipe 14 of the flow channel 13. A piston 17 is telescopically installed in the cylinder body 16, and the piston 17 is made of ferromagnetic material. A plurality of magnetic blocks 21 are embedded and fixed on the surface of the rotating shaft 3 along the circumferential direction, and the magnetic blocks 21 and the piston 17 attract each other. When the shaft 3 is rotating, whenever a magnet 21 approaches the piston 17, the piston 17 is acted upon by the magnetic force and moves inward, so that the liquid in the cylinder 16 is squeezed. At this time, the one-way valve in the liquid discharge pipe 20 on the cylinder 16 opens, so that the liquid in the cylinder 16 is discharged through the liquid discharge pipe 20. When the magnet 21 and the piston 17 are offset, the piston 17 automatically resets. At this time, the one-way valve in the liquid inlet pipe 12 on the cylinder 16 opens, so that the liquid in the liquid storage chamber 10 is sucked into the cylinder 16. In this way, the entire circulation module can realize autonomous operation with the help of the power of the shaft 3. For this reason, the fixed cylinder 1 and the cylinder 16 are made of non-metallic materials to reduce their weakening effect on the magnetic force of the magnet 21.

[0034] A striking head fixedly connected to the piston 17 is also provided outside the cylinder body 16. After the welding is completed, a slag shell will remain on the surface of the weld, which needs to be manually struck to facilitate observation of the weld and subsequent welding. For this reason, a striking head is connected to the piston 17, so that when the circulation module circulates the heat transfer fluid, the piston 17 can also be used to drive the striking head to strike the slag shell on the surface of the weld, thereby eliminating the need for subsequent manual removal of the slag shell.

[0035] The overall workflow of the present invention is as follows:

[0036] When welding, the feed shovel 2 in the flux recovery module is inserted into the flux at the weld where welding is completed. When the flux recovery module moves with the submerged arc welding machine, the feed shovel 2 shovels the residual flux at the weld into the feed port at the lower part of the fixed cylinder 1, and the rotating shaft 3 in the fixed cylinder 1 drives the plurality of blades 4 to make circular motion, so that the blades 4 can bring the flux entering at the feed port to the upper part of the fixed cylinder 1. When the blades 4 reach the height of the discharge port 5, the flux on the blades 4 will slide toward the discharge port 5 along its inclined surface under the action of gravity, and finally fall into the connecting cover 6 through the discharge port 5, and then be introduced into the feed chute 7 through the connecting cover 6, and finally be input into the flux funnel 8 through the feed chute 7, so that the recovered flux that absorbs the heat during welding will be laid on the unwelded weld.

[0037] In the above process, when the feeding shovel 2 moves in the weld, the heat exchanger 9 at the bottom of the feeding shovel 2 contacts the slag in the weld, thereby absorbing the heat of the slag and molten metal in the weld, and transferring it to the heat-conducting liquid in the internal liquid storage chamber 10, so that the heat-conducting liquid is heated; and when the rotating shaft 3 rotates, the multiple magnetic blocks 21 thereon intermittently approach the circulation module, so that the piston 17 in the circulation module reciprocates, and then the circulation module can suck the heat-conducting liquid in the liquid storage chamber 10 into the cylinder 16 through the suction pipe 19, and then discharge it into the flow channel 1 in the feeder through the discharge pipe 20. 3, the heat transfer liquid entering the feeder flow channel 13 exchanges heat with the flux in the feeder, so that the welding temperature rises, and the cooled heat transfer liquid flows back to the liquid storage chamber 10 in the heat exchange body 9 through the liquid inlet pipe 12. This continuous cycle allows the residual heat in the weld to be used for preheating the flux, further increasing the temperature of the recovered flux; in addition, when the piston 17 continuously reciprocates, the piston 17 also drives the striking head connected thereto to reciprocate and strike the slag in the weld on the rear side of the heat exchange body 9, so that the slag shell is separated from the weld, eliminating the need for subsequent manual removal of the slag shell.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A submerged arc welding device for large steel pipe production, comprising a submerged arc welding machine, characterized in that: A flux funnel (8) is arranged at the front side of the welding gun (22) of the submerged arc welding machine, and a flux recovery module is arranged at the rear side of the welding gun (22) of the submerged arc welding machine, the flux recovery module is fixed on the submerged arc welding machine, and the flux recovery module is connected to the welding funnel; The flux recovery module comprises a fixed cylinder (1), a feed shovel (2), a rotating shaft (3), blades (4), a discharge port (5), and a feeder. The fixed cylinder (1) is coaxially provided with a rotating shaft (3), the rotating shaft (3) is transmission-connected to a motor (23), a plurality of blades (4) are circumferentially provided on the surface of the rotating shaft (3), the blades (4) are axially tilted and fixed on the surface of the rotating shaft (3), the outer edges of the blades (4) are in contact with the inner wall of the fixed cylinder (1), a feed port is provided on the lower circumferential surface of the fixed cylinder (1), a feed shovel (2) is fixed on the feed port, the feed shovel (2) is used to extend into the weld to shovel out the flux in the weld; a discharge port (5) is provided on the upper end surface of the fixed cylinder (1), the discharge port (5) is connected to the feeder, and the feeder is connected to the welding funnel; A heat exchanger (9) is fixed to the lower surface of the feed shovel (2), the heat exchanger (9) being used to absorb residual heat in the weld, a liquid storage cavity (10) is provided inside the heat exchanger (9), the liquid storage cavity (10) being used to store heat transfer liquid, a liquid inlet pipe (12) and a liquid outlet pipe (11) which are connected to the liquid storage cavity (10) are provided on the heat exchanger (9), a flow channel (13) is provided in the inner wall of the feeder, an outlet pipe (15) and an inlet pipe (14) which are connected to the flow channel (13) are provided on the feeder, the outlet pipe (15) of the flow channel (13) is connected to the liquid inlet pipe (12), and the inlet pipe (14) of the flow channel (13) and the liquid outlet pipe (11) are connected via a circulation module; The circulation module comprises a cylinder body (16), the open end of the cylinder body (16) is arranged toward a side away from the fixed cylinder (1), a liquid suction pipe (19) and a liquid discharge pipe (20) are arranged on the outer surface of the cylinder body (16) along the circumferential direction, and a one-way valve is arranged in each of the liquid suction pipe (19) and the liquid discharge pipe (20), the liquid suction pipe (19) is connected to the liquid outlet pipe (11), and the liquid discharge pipe (20) is connected to the inlet pipe (14) of the flow channel (13), a piston (17) is telescopically installed in the cylinder body (16), and the piston (17) is made of ferromagnetic material, and a plurality of magnetic blocks (21) are embedded and fixed on the surface of the rotating shaft (3) along the circumferential direction, and the magnetic blocks (21) and the piston (17) attract each other; A striking head fixedly connected to the piston (17) is also provided outside the cylinder body (16).

2. The submerged arc welding equipment for large steel pipe production according to claim 1, characterized in that: The heat exchange body (9) is in the shape of a right triangle, and the hypotenuse surface of the heat exchange body (9) is attached to the lower surface of the shovel body.

3. The submerged arc welding equipment for large steel pipe production according to claim 1, characterized in that: The feeder comprises a connecting cover (6) and a feed chute (7); the connecting cover (6) is arranged on the discharge port (5); the lower part of the connecting cover (6) is connected to the feed chute (7); and the feed chute (7) is arranged to be inclined toward the flux funnel (8) as a whole.

4. The submerged arc welding equipment for large steel pipe production according to claim 3, characterized in that: A plurality of protruding columns are fixed on the bottom surface of the conveying slideway (7).

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