Welding device suitable for welding thick-wall pipe fitting

Abstract

The invention relates to the field of pipe fitting welding, and discloses a welding device suitable for welding thick-wall pipe fittings, the welding device comprises a rack, two thick pipes needing to be welded are installed in the rack, symmetrical vertical sliding frames are fixedly connected to the top surface of the rack, and the welding device further comprises a welding machine mechanism, a soaking mechanism and a supporting mechanism. When the two thick pipes are welded together, firstly, the soaking mechanism and the supporting mechanism are placed in the two thick pipes, the soaking mechanism is located at the joint of the two thick pipes, then the supporting mechanism supports the two thick pipes from the interior, and after the two sides of the top face of the flexible soaking plate make contact with the inner circumferential faces of the thick pipes, the welding device is controlled to conduct welding. And meanwhile, the driving roller starts to rotate slowly to drive the two thick pipes to rotate, so that the welding device welds the two thick pipes together, as the flexible vapor chamber abuts against the inner circumferential surfaces of the thick pipes, a molten pool at the welding position is supported from the bottom and does not flow downwards along a welding seam, and the problem that the quality of a welding point is poor is avoided.

Description

Technical Field

[0001] This application relates to the technical field of pipe fitting welding, and particularly to a welding device suitable for welding thick-walled pipe fittings. Background Art

[0002] Thick-walled pipe fittings are used in many industries such as petroleum, chemical industry, electric power, and construction. With the development of the industry, automatic welding machines have gradually replaced traditional manual welding, and operators only need to monitor the actual welding situation to adjust the relevant parameters of the welding machine.

[0003] In a welding factory, due to the long-term welding of the welding machine, the temperature in the workshop will continue to rise. In order to reduce the temperature in the workshop and discharge various waste gases generated during welding, and reduce the discomfort felt by operators in the workshop, the workshop is equipped with a ventilation system to circulate and replace the air in the workshop. Due to the rapid flow of air, the welding points of the pipe fittings being welded will cool down rapidly, resulting in problems such as cracks, deformation, and shrinkage in the welded parts, causing a decline in welding quality and easy damage from the welded parts. Summary of the Invention

[0004] This application proposes a welding device suitable for welding thick-walled pipe fittings, which has the advantages of heat preservation for the just-welded part and preheating for the part to be welded, so as to solve the problem that the existing equipment cannot protect the welding points during welding.

[0005] To achieve the above object, this application adopts the following technical solution: A welding device suitable for welding thick-walled pipe fittings includes a frame, two thick pipes to be welded are installed inside the frame, and symmetric vertical sliding frames are fixedly connected to the top surface of the frame. The welding device further includes: A welding machine mechanism, which includes a welding sliding frame slidably connected inside the vertical sliding frame, and a welding torch is slidably connected inside the welding sliding frame; A heat equalizing mechanism, which includes a sliding block and a housing. The sliding block is slidably connected inside the vertical sliding frame. A shaft frame is fixedly connected to the side of the sliding block facing the thick pipe. The shaft frame penetrates through the housing. A flat telescopic rod is fixedly connected to the top surface of the housing. The upward telescopic end of the flat telescopic rod is fixedly connected to a support shell. A cylinder is rotatably installed inside the support shell. A flexible heat equalizing plate is movably sleeved on the outer side of the cylinder. Symmetric first telescopic rods are hinged inside the support shell, and the telescopic ends of the first telescopic rods are hinged to the bottom surface of the flexible heat equalizing plate; A support mechanism, which internally supports the thick pipes and makes the two thick pipes coaxial.

[0006] Preferably, the flexible heat equalizing plate is at least composed of two layers of flexible materials stacked up and down. The top layer material is a heat conducting material layer, and the bottom layer is a heat insulating material layer.

[0007] Preferably, the width of the flexible vapor chamber is greater than the width of the weld between the two thick pipes. The top surface of the flexible vapor chamber abuts against the inner circumferential surfaces of the two thick pipes, and the contact areas between the top surface of the flexible vapor chamber and the inner circumferential surfaces of the two thick pipes are the same. The highest point of the arch of the flexible vapor chamber is directly below the welder.

[0008] Preferably, the bottom surface of the outer shell is fixedly connected to a second telescopic rod. The telescopic end of the second telescopic rod facing downward is rotatably installed with an inner roller, and the bottom of the inner roller abuts against the inner circumferential surfaces of the two thick pipes.

[0009] Preferably, the support mechanism includes a hollow shaft movably sleeved on the shaft frame. Two driving threads with opposite helix directions are provided on the hollow shaft. Fixed rings are respectively fixedly connected to the opposite side surfaces of the outer shell penetrated by the shaft frame, and sliding rings are threadedly connected to the driving threads.

[0010] Preferably, rotating hinge rings are rotatably installed on both the fixed ring and the sliding ring. A plurality of first connecting rods are hinged to the rotating hinge ring, and an abutting rod is hinged to two opposite first connecting rods.

[0011] Preferably, a penetrating frame is fixedly connected to the side surface of the fixed ring facing the sliding ring. The penetrating frame passes through the sliding ring, and the end of the penetrating frame away from the fixed ring is rotatably installed on the hollow shaft.

[0012] Preferably, a first gear is fixedly sleeved on the hollow shaft, a motor is fixedly connected inside the outer shell, a second gear is fixedly sleeved on the output shaft end of the motor, and the first gear meshes with the second gear.

[0013] Preferably, when the motor operates, the moving directions of the two sliding rings are determined by the rotation direction of the motor.

[0014] Preferably, a plurality of symmetric hydraulic cylinders are fixedly connected to the inner side surface of the frame. The telescopic ends of the hydraulic cylinders on the same side are fixedly connected to a sliding frame, and a driving roller is rotatably installed at the top of the sliding frame. The thick pipe is placed between the symmetric driving rollers.

[0015] The beneficial effects of the present invention are as follows: 1. When welding two thick pipes together, first place the soaking mechanism and the supporting mechanism inside the two thick pipes, with the soaking mechanism located at the joint of the two thick pipes. Then, use the supporting mechanism to support the two thick pipes from the inside. At this time, the outer shell is in a suspended state. Next, open the second telescopic rod so that the inner rollers abut against the inner circumferential surfaces of the two thick pipes. Then, start the flat telescopic rod to make the middle part of the top surface of the flexible soaking plate contact the inner circumferential surface of the thick pipe. After that, extend the first telescopic rod. When the two sides of the top surface of the flexible soaking plate contact the inner circumferential surface of the thick pipe, stop the first telescopic rod. At this time, the entire top surface of the flexible soaking plate is in contact with the inner circumferential surface of the thick pipe. Subsequently, control the welder to perform welding, and at the same time, make the driving rollers start to rotate slowly to drive the two thick pipes to rotate, so that the welder welds the two thick pipes together. When the welder starts welding initially, since the flexible soaking plate abuts against the inner circumferential surface of the thick pipe, the molten pool at the welding joint is supported from the bottom and will not flow down along the weld, avoiding the problem of poor quality of the welding points.

[0016] 2. Secondly, due to the contact between the flexible soaking plate and the welding point, the flexible soaking plate absorbs the heat during welding and heats itself, thus keeping itself in a high-temperature state. Moreover, the area of the flexible soaking plate is larger than the area of the welding point, and the welding point corresponds to the center of the flexible soaking plate. This makes the temperature of the area where the thick pipe contacts the flexible soaking plate rise after the temperature of the flexible soaking plate increases. When welding the two thick pipes, the thick pipes will be driven to rotate slowly by the driving rollers. That is, during the welding operation, the flexible soaking plate will heat the welded part and the part to be welded near the welding point, that is, keep the just-welded part warm and preheat the part to be welded, thus playing a role in reducing welding stress and improving the crack resistance of the weld, and avoiding the welding problems caused by the rapid cooling of the welded part due to the indoor air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings forming a part of the specification depict the embodiments disclosed in the present application and, together with the specification, are used to explain the principles of the present application in a clear and understandable manner.

[0018] Referring to the drawings, the present disclosure can be more clearly understood from the following detailed description, wherein: Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic cross-sectional structure diagram of the pipe fitting of the present invention; Figure 3 is a schematic structure diagram of the soaking mechanism of the present invention; Figure 4 is a schematic cross-sectional structure diagram of the support shell of the present invention; Figure 5 is a schematic structure diagram of the support mechanism of the present invention; Figure 6For the present invention Figure 5 Enlarged view of part A in the present invention; Figure 7 Schematic cross-sectional structure diagram of the fixing ring of the support mechanism of the present invention; Figure 8 Schematic structure diagram of the shaft bracket and the hollow shaft of the present invention.

[0019] Wherein: 1. Frame; 11. Vertical sliding frame; 12. Hydraulic cylinder; 13. Sliding frame; 14. Driving roller; 2. Thick pipe; 3. Welding machine mechanism; 31. Welding sliding frame; 32. Welding torch; 4. Soaking mechanism; 41. Sliding block; 42. Shaft bracket; 43. Outer shell; 44. Flat telescopic rod; 45. Bracket shell; 46. First telescopic rod; 47. Cylinder; 48. Flexible soaking plate; 49. Second telescopic rod; 410. Inner roller; 5. Support mechanism; 51. Hollow shaft; 52. Driving thread; 53. Fixing ring; 54. Sliding ring; 55. Rotating hinge ring; 56. First connecting rod; 57. Abutting rod; 58. Penetrating frame; 59. First gear; 510. Motor; 511. Second gear. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0021] As Figures 1 to 8 shown, a welding device applicable to welding thick-walled pipe fittings in this embodiment includes a frame 1. Two thick pipes 2 to be welded are installed inside the frame 1. Symmetric vertical sliding frames 11 are fixedly connected to the top surface of the frame 1. It further includes: A welding machine mechanism 3, which includes a welding sliding frame 31 slidably connected inside the vertical sliding frame 11, and a welding torch 32 slidably connected inside the welding sliding frame 31; A soaking mechanism 4, which includes a sliding block 41 and an outer shell 43. The sliding block 41 is slidably connected inside the vertical sliding frame 11. A shaft bracket 42 is fixedly connected to the side surface of the sliding block 41 facing the thick pipe 2. The shaft bracket 42 penetrates through the outer shell 43. A flat telescopic rod 44 is fixedly connected to the top surface of the outer shell 43. The upward telescopic end of the flat telescopic rod 44 is fixedly connected to a bracket shell 45. A cylinder 47 is rotatably installed inside the bracket shell 45. A flexible soaking plate 48 is movably sleeved on the outer side surface of the cylinder 47. Symmetric first telescopic rods 46 are hinged inside the bracket shell 45, and the telescopic ends of the first telescopic rods 46 are hinged to the bottom surface of the flexible soaking plate 48; A support mechanism 5, which supports the thick pipe 2 from the inside and makes the two thick pipes 2 coaxial.

[0022] When welding two thick pipes 2 together, first place the soaking mechanism 4 and the supporting mechanism 5 inside the two thick pipes 2, and position the soaking mechanism 4 at the joint of the two thick pipes 2. Then, let the supporting mechanism 5 support the two thick pipes 2 from the inside. At this time, the outer shell 43 is in a suspended state. Then, open the second telescopic rod 49 so that the inner roller 410 abuts against the inner circumferential surfaces of the two thick pipes 2. Next, start the flat telescopic rod 44 to make the middle part of the top surface of the flexible soaking plate 48 contact the inner circumferential surface of the thick pipe 2. Then, extend the first telescopic rod 46. When the two sides of the top surface of the flexible soaking plate 48 contact the inner circumferential surface of the thick pipe 2, stop the first telescopic rod 46. At this time, the entire top surface of the flexible soaking plate 48 is in contact with the inner circumferential surface of the thick pipe 2. Subsequently, control the welder 32 to perform welding, and at the same time, make the driving roller 14 start to rotate slowly to drive the two thick pipes 2 to rotate, so that the welder 32 welds the two thick pipes 2 together. When the welder 32 starts welding initially, since the flexible soaking plate 48 abuts against the inner circumferential surface of the thick pipe 2, the molten pool at the welding joint is supported from the bottom and will not flow down along the weld, avoiding the problem of poor quality of the welding point.

[0023] Secondly, due to the contact between the flexible soaking plate 48 and the welding point, the flexible soaking plate 48 absorbs the heat during welding and heats itself, so that it maintains a high temperature state. And the area of the flexible soaking plate 48 is larger than the area of the welding point, and the welding point corresponds to the center of the flexible soaking plate 48. This also makes the temperature of the area where the thick pipe 2 contacts the flexible soaking plate 48 rise after the temperature of the flexible soaking plate 48 increases. When welding the two thick pipes 2, the thick pipes 2 will be driven to rotate slowly by the driving roller 14. That is, in the welding work, the flexible soaking plate 48 will heat the welded part and the part to be welded near the welding point, that is, keep the just-welded part warm and preheat the part to be welded, thus playing a role in reducing welding stress and improving the crack resistance of the weld, and avoiding the welding problems caused by the rapid cooling of the welded part due to the indoor air flow.

[0024] Among them, the flexible soaking plate 48 is at least composed of two layers of flexible materials stacked up and down. Its top layer material is a heat-conducting material layer, and its bottom layer is a heat-insulating material layer. The width of the flexible soaking plate 48 is greater than the width of the weld between the two thick pipes 2. The top surface of the flexible soaking plate 48 abuts against the inner circumferential surfaces of the two thick pipes 2. The contact area between the top surface of the flexible soaking plate 48 and the inner circumferential surfaces of the two thick pipes 2 is the same. The highest point of the arch of the flexible soaking plate 48 is directly below the welder 32.

[0025] By setting the flexible soaking plate 48 inside the thick pipe 2, as the first telescopic rod 46 extends, the entire top surface of the flexible soaking plate 48 abuts against the inner circumferential surface of the thick pipe 2. Thus, when welding thick pipes 2 of different sizes, only by adjusting the extension length of the first telescopic rod 46, the flexible soaking plate 48 can be made to fit the inner wall of the thick pipe 2 with different diameters.

[0026] Among them, the bottom surface of the outer shell 43 is fixedly connected to the second telescopic rod 49. An inner roller 410 is rotatably installed at the telescopic end of the second telescopic rod 49 facing downward. The bottom of the inner roller 410 abuts against the inner circumferential surfaces of the two thick pipes 2.

[0027] The inner roller 410 is provided for weight balancing on the one hand to ensure that the support shell 45 always faces upward. At the same time, it can also extrude the welded part of the thick pipe 2, so as to extrude the unfixed welded part outward, avoiding the flow of the welded metal into the interior of the thick pipe 2, resulting in protrusions at the welded part and affecting the use of the pipe fitting.

[0028] Among them, the support mechanism 5 includes a hollow shaft 51 movably sleeved on the shaft frame 42. Two driving threads 52 with opposite helix directions are provided on the hollow shaft 51. Opposite side surfaces of the outer shell 43 penetrated by the shaft frame 42 are respectively fixedly connected with fixing rings 53. A sliding ring 54 is threadedly connected to the driving thread 52. Rotating hinge rings 55 are rotatably installed on both the fixing ring 53 and the sliding ring 54. A plurality of first connecting rods 56 are hinged to the rotating hinge ring 55. Opposite two first connecting rods 56 are hinged to an abutting rod 57. A penetrating frame 58 is fixedly connected to the side surface of the fixing ring 53 facing the sliding ring 54. The penetrating frame 58 passes through the sliding ring 54, and the end of the penetrating frame 58 away from the fixing ring 53 is rotatably installed on the hollow shaft 51.

[0029] Through the two driving threads 52 with opposite helix directions, after the hollow shaft 51 rotates, the sliding directions of the two sliding rings 54 are opposite. Thus, driven by the sliding ring 54, the abutting rod 57 approaches or moves away from the inner wall of the thick pipe 2. After the abutting rod 57 abuts against the inner wall of the thick pipe 2, the support mechanism 5 makes the two thick pipes 2 coaxial from the inside of the thick pipe 2, avoiding misalignment of the two thick pipes 2 on both sides during welding, resulting in misalignment of the pipeline after welding.

[0030] Among them, a first gear 59 is fixedly sleeved on the hollow shaft 51. A motor 510 is fixedly connected inside the outer shell 43. A second gear 511 is fixedly sleeved at the output shaft end of the motor 510. The first gear 59 and the second gear 511 are meshed with each other. When the motor 510 works, the moving directions of the two sliding rings 54 are determined by the rotation direction of the motor 510.

[0031] Among them, a plurality of symmetric hydraulic cylinders 12 are fixedly connected to the inner side surface of the frame 1. The telescopic ends of the hydraulic cylinders 12 on the same side are fixedly connected with a sliding frame 13. A driving roller 14 is rotatably installed at the top of the sliding frame 13. The thick pipe 2 is placed between the symmetric driving rollers 14.

[0032] Working principle: When using this device to weld two thick pipes 2 together (such as extending the thick pipe 2), first place the parts to be welded on the driving rollers 14, and adjust the position of the sliding frame 13 to facilitate observing the welding part during welding. After placing the thick pipe 2 in the frame 1, place the soaking mechanism 4 and the supporting mechanism 5 inside the thick pipe 2.

[0033] After that, start the motor 510, which drives the hollow shaft 51 to rotate through the first gear 59 and the second gear 511, and then move the sliding rings 54 on both sides towards the direction of the housing 43. At this time, under the movement of the sliding rings 54, the first connecting rod 56 drives the abutting rod 57 to move, so that the abutting rod 57 contacts the inner wall of the thick pipe 2, thereby making the center of the housing 43 on the axis of the thick pipe 2, ensuring that after the flat telescopic rod 44 extends, the center of the flexible soaking plate 48 can contact the highest point of the inner peripheral surface of the thick pipe 2, preventing the flexible soaking plate 48 from being tightly pressed against the inner peripheral surface of the thick pipe 2 due to different extension lengths of the first telescopic rods 46 on both sides, which may cause severe friction between the flexible soaking plate 48 and the thick pipe 2 when the thick pipe 2 rotates. At the same time, it also avoids the existence of gaps between the flexible soaking plate 48 and the welding part due to the flexible soaking plate 48 not being attached to the inner peripheral surface of the thick pipe 2, resulting in the molten pool flowing into the gap and forming protrusions on the inner peripheral surface of the thick pipe 2.

[0034] After the abutting rod 57 of the supporting mechanism 5 abuts, first control the second telescopic rod 49 to extend, so that the lower inner roller 410 abuts on the inner peripheral surface of the thick pipe 2, then control the flat telescopic rod 44 to extend, so that the center position of the flexible soaking plate 48 abuts on the inner peripheral surface of the thick pipe 2, and then control the first telescopic rod 46 to extend, so that the entire flexible soaking plate 48 is attached.

[0035] Subsequently, weld by using the welder 32, and at the same time drive the thick pipe 2 to rotate through the driving rollers 14, so that during welding, the just-welded part can be insulated and the part to be welded can be preheated through the heat conduction of the flexible soaking plate 48.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A welding device suitable for welding thick-walled pipe fittings, comprising a frame (1), wherein two thick pipes (2) to be welded are installed in the frame (1), and a symmetrical vertical slide frame (11) is fixedly connected to the top surface of the frame (1), characterized in that: Also includes: A welding machine mechanism (3), comprising a welding slide (31) slidably connected in the vertical slide (11), wherein a welder (32) is slidably connected in the welding slide (31); A heat equalizing mechanism (4), comprising a sliding block (41) and a shell (43), wherein the sliding block (41) is slidably connected in the vertical sliding frame (11), the sliding block (41) is fixedly connected to a shaft frame (42) on the side facing the thick tube (2), the shaft frame (42) penetrates the shell (43), the top surface of the shell (43) is fixedly connected to a flat telescopic rod (44), the upward telescopic end of the flat telescopic rod (44) is fixedly connected to a bracket shell (45), a cylinder (47) is rotatably installed in the bracket shell (45), the outer side surface of the cylinder (47) is movably sleeved with a flexible heat equalizing plate (48), a symmetrical first telescopic rod (46) is hinged in the bracket shell (45), and the telescopic end of the first telescopic rod (46) is hinged to the bottom surface of the flexible heat equalizing plate (48); A supporting mechanism (5) supports the thick tube (2) from the inside and makes the two thick tubes (2) coaxial.

2. A welding device suitable for welding thick-walled pipe fittings according to claim 1, characterized in that: The flexible heat spreader (48) is composed of two layers of flexible material stacked up and down, the uppermost layer of which is a heat-conducting material layer, and the lowermost layer of which is a heat-insulating material layer.

3. A welding device suitable for welding thick-walled pipe fittings according to claim 2, characterized in that: The width of the flexible heat soaking plate (48) is greater than the width of the weld between the two thick tubes (2); the top surface of the flexible heat soaking plate (48) abuts against the inner circumference of the two thick tubes (2); the contact area between the top surface of the flexible heat soaking plate (48) and the inner circumference of the two thick tubes (2) is the same; and the highest point of the arch of the flexible heat soaking plate (48) is located directly below the welder (32).

4. A welding device suitable for welding thick-walled pipe fittings according to claim 3, characterized in that: The bottom surface of the outer shell (43) is fixedly connected to a second telescopic rod (49), and an inner roller (410) is installed on the telescopic end of the second telescopic rod (49) that is rotatably directed downward, and the bottom of the inner roller (410) abuts against the inner circumferential surfaces of the two thick tubes (2).

5. A welding device suitable for welding thick-walled pipe fittings according to claim 4, characterized in that: The support mechanism (5) comprises a hollow shaft (51) movably sleeved on the shaft frame (42), the hollow shaft (51) being provided with two drive threads (52) with opposite rotation directions, two opposite side surfaces of the housing (43) penetrated by the shaft frame (42) being fixedly connected with fixing rings (53) respectively, and a sliding ring (54) being threadedly connected with the drive threads (52).

6. A welding device suitable for welding thick-walled pipe fittings according to claim 5, characterized in that: A rotating hinge ring (55) is rotatably mounted on both the fixed ring (53) and the sliding ring (54), a plurality of first connecting rods (56) are hingedly connected to the rotating hinge ring (55), and two opposing first connecting rods (56) are hingedly connected to abutment rods (57).

7. A welding device suitable for welding thick-walled pipe fittings according to claim 6, characterized in that: A through-frame (58) is fixedly connected to the side of the fixed ring (53) facing the sliding ring (54); the through-frame (58) passes through the sliding ring (54); and one end of the through-frame (58) away from the fixed ring (53) is rotatably mounted on the hollow shaft (51).

8. A welding device suitable for welding thick-walled pipe fittings according to claim 7, characterized in that: A first gear (59) is fixedly sleeved on the hollow shaft (51), a motor (510) is fixedly connected inside the housing (43), a second gear (511) is fixedly sleeved on the output shaft end of the motor (510), and the first gear (59) and the second gear (511) are meshed with each other.

9. A welding device suitable for welding thick-walled pipe fittings according to claim 8, characterized in that: When the motor (510) is working, the movement direction of the two sliding rings (54) is determined by the rotation direction of the motor (510).

10. A welding device suitable for welding thick-walled pipe fittings according to claim 9, characterized in that: A plurality of symmetrical hydraulic cylinders (12) are fixedly connected to the inner side surface of the frame (1); a sliding frame (13) is fixedly connected to the telescopic end of the hydraulic cylinder (12) on the same side; a driving roller (14) is rotatably mounted on the top of the sliding frame (13); and the thick pipe (2) is placed between the symmetrical driving rollers (14).

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