Straight welded pipe preheating device adopting arc-shaped track

Abstract

The utility model discloses a longitudinal welded pipe preheating device adopting an arc-shaped track, which comprises the arc-shaped track arranged around a longitudinal welded pipe and further comprises a preheating system and a driving system used for driving the preheating system to slide along the arc-shaped track so as to enable the preheating system to be aligned with a welding seam of the longitudinal welded pipe. And the preheating system is connected with the arc-shaped track through the driving system. The preheating device for the longitudinal welded pipe is simple in structure, reasonable in design and easy and convenient to operate, through mutual cooperation of all the devices, a heating system can preheat welding seams at different positions of the longitudinal welded pipe, uniform heating of the welding seams can be achieved, and therefore the welding stress and the deformation risk are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to welding auxiliary equipment field especially relates to a straight seam welded pipe preheating device. BACKGROUND

[0002] High-strength pipeline steel is widely used in oil and gas transmission pipelines due to its excellent performance. They have high strength, corrosion resistance, weldability and other characteristics, which can ensure the safe and stable operation of the pipeline in harsh environments such as high pressure and high corrosion. However, in the welding of straight seam welded pipes, the weld will have weak areas, such as low-carbon martensite in the weld heat-affected zone, which affects the quality of the welded pipe and reduces the service life of the welded pipe. Preheating before welding can solve the above problems. Preheating before welding can significantly slow down the cooling rate after welding, which helps to escape the diffused hydrogen in the weld metal, thereby avoiding the generation of hydrogen-induced cracks. At the same time, it also helps to reduce the hardening degree of the weld and the heat-affected zone, and improve the crack resistance of the welded joint. By uniformly preheating locally or as a whole, the temperature difference between the welded areas of the workpieces can be reduced, thereby significantly reducing the welding stress, helping to prevent deformation during the welding process, making the weld more secure, and improving the welding quality.

[0003] However, due to the large diameter of the large-diameter welded pipe, it is difficult to control the weld position at the specified position during preheating, which makes it difficult to uniformly heat the weld area during preheating, thereby causing the welding quality to decrease. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies and defects mentioned in the above background technology, and to provide a straight seam welded pipe preheating device using an arc-shaped track with adjustable preheating position.

[0005] To solve the above technical problems, the technical solution provided by the utility model is:

[0006] A straight seam welded pipe preheating device using an arc-shaped track, comprising an arc-shaped track, the arc-shaped track being arranged around the straight seam welded pipe, further comprising a preheating system and a drive system for driving the preheating system to slide along the arc-shaped track to align the preheating system with the weld of the straight seam welded pipe, the preheating system being connected to the drive system and the arc-shaped track;

[0007] The drive system comprises a connecting truss and a drive assembly for driving the connecting truss to slide along the surface of the arc-shaped track in an arc shape, and the preheating system is arranged on the connecting truss. The connecting truss is driven by the drive system to move in an arc shape, thereby adjusting the position of the preheating system along the arc-shaped track by the connecting truss, so as to facilitate the heating system to preheat the weld at different positions of the straight seam welded pipe.

[0008] The arc-shaped track can adopt a semicircular track, the straight seam welded pipe is arranged in the inner circle of the semicircular track, the preheating system is driven by the driving system to slide relative to the semicircular track to adjust the position, the preheating system can be aligned with the weld of the straight seam welded pipe, precise preheating of the weld in different positions during preheating is realized, and manual adjustment of the weld position is not needed. Meanwhile, as long as the radius of the straight seam welded pipe is smaller than the radius of the semicircular track, the device can be used for preheating, and therefore, the straight seam welded pipe preheating device can also satisfy preheating of straight seam welded pipes with different diameters.

[0009] In the straight seam welded pipe preheating device, preferably, a tooth key is arranged on the arc-shaped track, the driving assembly comprises a driving source arranged on the arc-shaped track, the driving source comprises a first sliding block, a rotary motor and a gear, the rotary motor and the gear are connected and arranged on the first sliding block, the gear is engaged with the tooth key, and the connecting truss is fixedly arranged on the first sliding block. The rotary motor is connected with the first sliding block by bolts, and the rotary motor and the gear are connected by a key and a key groove. The rotary motor provides main power, drives the gear to rotate, the gear is matched with the tooth key on the arc-shaped track, the gear drives the first sliding block to move on the arc-shaped track when the gear rotates, and the first sliding block is connected with the connecting truss by bolts, so that the connecting truss can move relative to the arc-shaped track.

[0010] In the straight seam welded pipe preheating device, preferably, upper and lower surfaces of the arc-shaped track are respectively provided with an upper groove body and a lower groove body, the tooth key is arranged in the upper groove body, the driving source further comprises a first upper roller and a first lower roller, the first upper roller and the first lower roller are arranged on the first sliding block and rotatably clamped in the upper groove body and the lower groove body respectively. The first upper roller and the first lower roller are clamped in the upper groove body and the lower groove body respectively, so that the structural stability of the first sliding block during sliding can be improved.

[0011] In the straight seam welded pipe preheating device, preferably, a plurality of arc-shaped tracks are arranged in parallel along the length direction of the straight seam welded pipe, the driving source is arranged on one of the arc-shaped tracks, the driving assembly further comprises a driven driving source arranged on the other arc-shaped tracks, the driven driving source comprises a second sliding block, a second upper roller and a second lower roller, the second upper roller and the second lower roller are arranged on the second sliding block and rotatably clamped in the upper groove body and the lower groove body respectively, and the connecting truss is fixedly arranged on the first sliding block and the second sliding block. The driven driving source mainly cooperates with the driving source to work, does not provide power by itself, moves synchronously with the driving source, and the arrangement of the driven driving source can further improve the structural stability.

[0012] In the straight seam welded pipe preheating device, preferably, the preheating system comprises a heater, the heater is arranged parallel to the straight seam welded pipe, and the length of the heater matches the weld of the straight seam welded pipe.

[0013] Preferably, the heater is arranged on the connecting truss through a lifting assembly and can be lifted up and down. The heater can be lifted up and down through the lifting assembly, so that the distance between the heater and the straight seam welded pipe can be adjusted to match the straight seam welded pipes of different sizes.

[0014] Preferably, the lifting assembly comprises a lifting motor, a speed reducer, a shaft coupling and a screw rod lifter. The speed reducer is arranged on the connecting truss and connected with the lifting motor. The speed reducer is connected with the screw rod lifter through the shaft coupling. The screw rod of the screw rod lifter is connected with the heater. A hole is arranged on the connecting truss for mounting the screw rod lifter. The lifting motor and the speed reducer are connected together through bolts. The speed reducer is arranged on the connecting truss and fixed through bolts. The speed reducer is connected with the screw rod lifter through the shaft coupling and arranged on the connecting truss. The lifting motor is rotated to drive the speed reducer to rotate. The speed reducer drives the screw rod lifter to move through the shaft coupling, so that the heater can move up and down.

[0015] Preferably, the lifting assembly is connected with the heater through a rotary joint for rotating the heater along its own axis. After the heater is adjusted to the appropriate position through the driving system and the lifting assembly, the heater may not be directly opposite the weld. The joint drive of the rotary joint is powered to enable the rotary joint to rotate, so that the heater is rotated along its own axis, the heater is tangent to the position of the weld of the straight seam welded pipe, and the preheating effect can be further improved.

[0016] Preferably, one end of the lifting assembly is connected with the rotary joint, and the other end of the rotary joint is connected with the heater through a flange.

[0017] Preferably, the heater adopts infrared heating. The radiation heat transfer mode can directly act on the surface of the workpiece. The energy utilization rate is wide, and the temperature control range can meet the preheating temperature required by most straight seam welded pipe preheating. Compared with the traditional heating method, the energy saving effect is remarkable. The infrared heating has a fast heating speed, can realize rapid heating in a short time, can realize uniform heating of the weld, and can reduce the welding stress and deformation risk.

[0018] The working steps of the preheating method of the straight seam welded pipe preheating device are as follows:

[0019] In the operation process, when the straight seam welded pipe passes through the conveying roller to the preheating device, the position of the welded pipe weld is observed. After determining the position of the weld, based on PLC control, the driving source and the driven driving source drive the connecting truss to move relative to the arc-shaped track, rotate the heater to the position closest to the weld on the heater arc track, then push the heater to the position 20mm away from the weld through the lifting assembly, then rotate the heater to be tangent to the weld through the rotary joint, and finally start preheating the weld.

[0020] The straight seam welded pipe preheating device can preheat the welds at different positions of the straight seam welded pipe by the heating system, avoid weld defects caused by uneven preheating, and preheat the welds of the straight seam submerged arc welded pipe of different diameters on the production line before welding by adjusting the positions of the devices through the PLC, and adapt to the welded pipe production line of different welded pipe diameters.

[0021] Compared with the prior art, the straight seam welded pipe preheating device has the advantages that:

[0022] The straight seam welded pipe preheating device has the advantages of simple structure, reasonable design, simple operation process, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0024] Figure 1 It is a structural schematic view of the straight seam welded pipe preheating device.

[0025] Figure 2 It is Figure 1 the front view (not showing the straight seam welded pipe).

[0026] Figure 3 It is a structural schematic view of the straight seam welded pipe preheating device omitting the heating system.

[0027] Figure 4 It is a structural schematic view of the lifting assembly.

[0028] Figure 5 It is a structural schematic view of the heater and the rotary joint.

[0029] LEGEND

[0030] S1: Straight seam welded pipe; 1. Arc track; 101. Upper tank; 102. Lower tank; 2. Connecting truss; 3. First slider; 4. Rotary motor; 5. Gear; 6. First upper roller; 7. First lower roller; 8. Second slider; 9. Second upper roller; 10. Second lower roller; 11. Heater; 12. Lifting motor; 13. Reducer; 14. Coupling; 15. Screw jack; 16. Rotary joint; 17. Flange. Detailed Implementation

[0031] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0032] It should be noted that when a component is described as being "fixed to, attached to, connected to or connected to" another component, it can be directly fixed to, attached to, connected to or connected to the other component, or it can be indirectly fixed to, attached to, connected to or connected to the other component through other intermediate connectors.

[0033] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0034] Unless otherwise specified, all instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0035] Example:

[0036] like Figures 1-2 As shown, the straight seam welded pipe preheating device with an arc-shaped track in this embodiment includes an arc-shaped track 1, which is arranged around the straight seam welded pipe S1. Three arc-shaped tracks 1 are arranged side by side along the length of the straight seam welded pipe S1. The straight seam welded pipe preheating device also includes a preheating system and a drive system for driving the preheating system to slide along the arc-shaped track 1 so that the preheating system is aligned with the weld seam of the straight seam welded pipe S1. The preheating system is connected to the arc-shaped track 1 through the drive system.

[0037] like Figure 3 As shown, in this embodiment, the drive system includes a connecting truss 2 and a drive assembly for driving the connecting truss 2 to slide in an arc along the surface of the arc track 1. The preheating system is located on the connecting truss 2.

[0038] Specifically, in the embodiment, the arc-shaped tracks 1 are provided with tooth keys, the driving assembly comprises a driving source arranged on one of the arc-shaped tracks 1, and further comprises a driven driving source arranged on the other arc-shaped tracks 1. The driving source comprises a first sliding block 3, a rotary motor 4 and a gear 5, the rotary motor 4 and the gear 5 are connected and arranged on the first sliding block 3, the gear 5 is engaged with the tooth key, and the connecting truss 2 is fixedly arranged on the first sliding block 3.

[0039] The upper and lower surfaces of the arc-shaped tracks 1 are respectively provided with upper and lower groove bodies 101 and 102, the tooth key is arranged in the upper groove body 101, the driving source further comprises a first upper roller 6 and a first lower roller 7, the first upper roller 6 and the first lower roller 7 are arranged on the first sliding block 3 and rotatably clamped in the upper and lower groove bodies 101 and 102 respectively.

[0040] The driven driving source comprises a second sliding block 8, a second upper roller 9 and a second lower roller 10, the second upper roller 9 and the second lower roller 10 are arranged on the second sliding block 8 and rotatably clamped in the upper and lower groove bodies 101 and 102 respectively, and the connecting truss 2 is fixedly arranged on the first sliding block 3 and the second sliding block 8.

[0041] In the embodiment, the preheating system comprises a heater 11, the heater 11 is arranged parallel to the straight seam welded pipe S1, and the length of the heater 11 matches the weld of the straight seam welded pipe S1. The heater 11 is arranged on the connecting truss 2 and can be raised and lowered by a lifting assembly.

[0042] As shown in the figure, Figure 4 In the embodiment, the lifting assembly comprises a lifting motor 12, a speed reducer 13, a shaft coupling 14 and a screw lifting machine 15, the speed reducer 13 is arranged on the connecting truss 2 and connected with the lifting motor 12, the speed reducer 13 is connected with the screw lifting machine 15 through the shaft coupling 14, and the screw of the screw lifting machine 15 is connected with the heater 11.

[0043] As shown in the figure, Figure 5 In the embodiment, the lifting assembly is connected with the heater 11 through a rotary joint 16 for rotating the heater 11 along its own axis. One end of the lifting assembly is connected with the rotary joint 16, and the other end of the rotary joint 16 is connected with the heater 11 through a flange 17.

[0044] In other embodiments, the number of arc-shaped tracks 1 and the number of driving sources can also be adjusted, and the utility model is not limited.

[0045] In the embodiment, the rotary motor 4, the heater 11, the lifting motor 12, the speed reducer 13, the shaft coupling 14 and the screw lifting machine 15 can all use existing conventional equipment, for example, the heater 11 uses infrared heating.

[0046] The working steps of the preheating method of the straight seam welded pipe preheating device in the embodiment are as follows:

[0047] During the operation, when the straight seam welded pipe S1 is transported to the preheating device by the conveying roller, the position of the weld is observed. After the position of the weld is determined, based on the PLC control, the driving source and the driven driving source drive the connecting truss 2 to move relative to the arc-shaped track 1, rotate the heater 11 to the position closest to the weld on the arc track, push the heater 11 to the position 20mm away from the weld through the lifting assembly, rotate the heater 11 to be tangent to the weld through the rotary joint 16, and finally start to preheat the weld.

[0048] The straight seam welded pipe preheating device of the embodiment can make the heating system preheat the welds at different positions of the straight seam welded pipe S1, avoid the weld defects caused by uneven preheating, and preheat the welds of the straight seam welded pipe S1 of different diameters on the production line through the PLC adjustment of the positions of the devices.

[0049] The above only describes the preferred embodiments of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can be changed and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A straight seam welded pipe preheating device using an arc track, characterized by, The arc-shaped track (1) is arranged around the straight seam welded pipe (S1), and the preheating system is connected with the arc-shaped track (1) through the driving system. The driving system comprises a connecting truss (2) and a driving assembly for driving the connecting truss (2) to slide along the surface of the arc-shaped track (1) in an arc shape, and the preheating system is arranged on the connecting truss (2).

2. The straight seam welded pipe preheating device according to claim 1, characterized in that, The arc-shaped track (1) is provided with a tooth key, and the driving assembly comprises a driving source arranged on the arc-shaped track (1), wherein the driving source comprises a first sliding block (3), a rotary motor (4) and a gear (5), the rotary motor (4) and the gear (5) are connected and arranged on the first sliding block (3), the gear (5) is engaged with the tooth key, and the connecting truss (2) is fixedly arranged on the first sliding block (3).

3. The straight seam welded pipe preheating device according to claim 2, characterized in that, The upper and lower surfaces of the arc-shaped track (1) are respectively provided with an upper groove body (101) and a lower groove body (102), the tooth key is arranged in the upper groove body (101), and the driving source further comprises a first upper roller (6) and a first lower roller (7), which are arranged on the first sliding block (3) and rotatably clamped in the upper groove body (101) and the lower groove body (102) respectively.

4. The straight seam welded pipe preheating device according to claim 3, characterized in that, A plurality of arc-shaped tracks (1) are arranged along the length direction of the straight seam welded pipe (S1), the driving source is arranged on one of the arc-shaped tracks (1), the driving assembly further comprises a driven driving source arranged on the other arc-shaped track (1), the driven driving source comprises a second sliding block (8), a second upper roller (9) and a second lower roller (10), the second upper roller (9) and the second lower roller (10) are arranged on the second sliding block (8) and rotatably clamped in the upper groove body (101) and the lower groove body (102) respectively, and the connecting truss (2) is fixedly arranged on the first sliding block (3) and the second sliding block (8).

5. The straight seam welded pipe preheating device according to any one of claims 1-4, characterized in that, The preheating system comprises a heater (11), the heater (11) is arranged parallel to the straight seam welded pipe (S1), and the length of the heater (11) matches the weld of the straight seam welded pipe (S1).

6. The straight seam welded pipe preheating apparatus according to claim 5, characterized by The heater (11) is arranged on the connecting truss (2) and can be lifted up and down through a lifting assembly.

7. The straight seam welded pipe preheating apparatus according to claim 6, characterized by The lifting assembly comprises a lifting motor (12), a speed reducer (13), a shaft coupling (14) and a screw lifting machine (15), the speed reducer (13) is arranged on the connecting truss (2) and connected with the lifting motor (12), the speed reducer (13) is connected with the screw lifting machine (15) through the shaft coupling (14), and the screw of the screw lifting machine (15) is connected with the heater (11).

8. The straight seam welded pipe preheating apparatus as claimed in claim 6, wherein The lifting assembly is connected with the heater (11) through a rotary joint (16) for rotating the heater (11) along its own axial direction.

9. The straight seam welded pipe preheating apparatus according to claim 8, characterized in that, The lifting assembly is connected with one end of a rotary joint (16), and the other end of the rotary joint (16) is connected with the heater (11) through a flange (17).

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