A back of pipe weld protection device

Abstract

The utility model relates to a kind of for pipeline weld back protection device. To solve the influence of weld gap group and no gap group on back protection effect when pipeline welding is primed. The utility model technical scheme includes big cylinder;Air bag is respectively arranged on the left and right sides step of big cylinder, and two gas outlets, oxygen measuring port and fixed support are further provided on big cylinder, air outlet quick connector one, air outlet quick connector two, air inlet quick connector and oxygen measuring quick connector are respectively provided on fixed support, oxygen measuring port is provided on big cylinder, and oxygen measuring port is connected with oxygen measuring instrument by oxygen measuring hose;Small cylinder is hollow and is provided with boss at both ends, left end cover and right end cover are respectively sleeved on both end bosses, spacer sleeve is provided on the left side boss of small cylinder, air inlet is provided on right end cover, and air inlet is fixedly connected on air inlet quick connector by hose;Air hole is uniformly arranged on the circumference of small cylinder, and each air hole is connected with big cylinder by air hose.

Description

Technical Field

[0001] This utility model relates to the field of different pipeline argon arc welding technology, specifically to a back protection device for pipeline welds. Background Technology

[0002] Bimetallic composite pipes, titanium alloy pipes, and stainless steel pipes are increasingly being used in marine oil and special industries due to their high corrosion resistance and relatively low cost.

[0003] Welding bimetallic composite pipes is challenging and requires high-quality workmanship. Currently, the most reliable and stable method is argon arc welding (argon-gluing). When welding bimetallic composite pipes using argon arc welding, the weld back side inside the pipe also needs argon gas protection to prevent oxidation. The effectiveness of argon gas protection during the root pass directly affects the corrosion resistance of the CRA layer in the composite pipe, thus determining its service life. Therefore, gas protection on the weld back side is crucial for welding quality.

[0004] Patent CN116175015A discloses a back-side protection device and method for pipeline welds. The proposed solution includes an annular column, a first annular airbag, a second annular airbag, a protective gas inlet pipe, an exhaust pipe, an expansion pipe, and a traveling mechanism. The annular column has a hollow cavity with several air supply and exhaust holes. The first and second annular airbags are respectively fitted onto the two ends of the annular column. The protective gas inlet pipe extends into the hollow cavity. The exhaust pipe is connected to the exhaust holes. The expansion pipe is connected to the first and second annular airbags. The traveling mechanism is used for the device to move within the pipeline. However, this device has certain limitations. It is not very suitable for welds with gaps at butt joints, and the back-side protection effect is generally poor, making it difficult to meet construction requirements. This results in unstable weld quality, a high rework rate, and significant cost waste. Utility Model Content

[0005] In view of this, in order to solve the problem of poor weld quality and rework caused by the influence of gap-filled and gapless weld seams on the back protection effect during pipe welding root pass, this utility model provides a pipe weld back protection device.

[0006] To address the problems existing in the prior art, the technical solution adopted by this utility model is: a back protection device for pipe welds, comprising a large cylinder and a small cylinder fitted inside the large cylinder; Airbags are installed on the steps on the left and right sides of the large cylinder. The large cylinder is also equipped with two air outlets, an oxygen measuring port and a fixed bracket. The fixed bracket is equipped with an air outlet quick connector one, an air outlet quick connector two, an air inlet quick connector and an oxygen measuring quick connector. The large cylinder is equipped with an oxygen measuring port, which is connected to the oxygen analyzer through an oxygen measuring hose. The small cylinder is hollow and has protrusions at both ends. A left end cap and a right end cap are respectively fitted on the protrusions at both ends. A spacer is provided on the left protrusion of the small cylinder, and an air inlet is provided on the right end cap. The air inlet is fixed to the air inlet quick connector through a flexible hose. Ventilation holes are evenly distributed on the circumference of the small cylinder, and each ventilation hole is connected to the large cylinder through a ventilation hose.

[0007] Furthermore, the airbag has baffles on its sides, and wheel assemblies are mounted on the baffles.

[0008] Furthermore, the fixed bracket is installed on one side baffle of the large cylinder.

[0009] Furthermore, sealing rings are respectively provided on the left and right end caps of the small cylinder between the small cylinder and the left and right end caps, and the small cylinder is fixed to the left and right end caps by bolts.

[0010] Furthermore, the fixed bracket is equipped with lifting rings and handles.

[0011] Furthermore, the small holes on the circumference of the small cylinder are arranged in two rows.

[0012] Furthermore, quick-connect fittings for inflation and deflation are provided on the left and right airbags of the large cylinder.

[0013] Furthermore, a traction rope is installed on the lifting ring.

[0014] Compared with the prior art, the advantages of this utility model are as follows: 1. This utility model uses multiple evenly distributed air outlet hoses connected to the air outlet, making the air output more direct and uniform, and providing better protection.

[0015] 2. This utility model is equipped with a partition sleeve, which greatly reduces the volume of the argon chamber, saves argon gas, and significantly shortens the filling time.

[0016] 3. This utility model is equipped with an oxygen analyzer, which can digitally monitor the back protection effect of the weld in real time, greatly improving welding quality and efficiency.

[0017] 4. This utility model has a large number of air outlets on the circumference of the large cylinder. The air outlets are aimed at the back of the weld and blow argon gas directly, which provides good and stable protection during the welding process.

[0018] 5. This utility model has a wider range of welding applications and can achieve excellent back protection for both gap-free and gapless pipe weld assemblies.

[0019] 6. The airbag of this utility model is resistant to high temperature, has strong passability, and is easy to replace. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of the present invention.

[0021] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0022] Figure 3 This is a front view of the present utility model.

[0023] Figure 4 This is a reference diagram showing the usage state of this utility model.

[0024] Explanation of reference numerals in the attached diagram: 1-Left side baffle, 2-Left airbag, 3-Large cylinder, 4-Air outlet, 5-Right airbag, 6-Wheel seat assembly, 7-Ventilation hose, 8-Left end cap, 9-Left end cap sealing ring, 10-Ventilation port, 11-Small cylinder, 12-Right end cap sealing ring, 13-Bracket, 14-Right end cap, 15-Air inlet, 16-Spacer sleeve, 17-Outlet hose one, 18-Outlet hose two, 19-Oxygen measuring hose, 20-Oxygen measuring port, 21-Right side baffle, 22-Lifting ring, 23-Fixed bracket, 24-Handle, 25-Blocking plate, 26-Outlet quick-connect plug one, 27-Outlet quick-connect plug two, 28-Air inlet quick-connect plug, 29-Oxygen measuring quick-connect plug, 30-Torsion rope, 31-Oxygen meter, 32-Airbag quick-connect plug one, 33-Airbag quick-connect plug two. Detailed Implementation

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1-4 As shown, this embodiment provides a back protection device for pipe welds, including a hollow small cylinder 11 and a large cylinder 3.

[0028] The small cylinder 11 has protrusions at both ends for mounting left and right end caps for sealing. The left end cap 8 is bolted to the left end protrusion, and the right end cap 14 is bolted to the right end protrusion. Left end cap sealing rings 9 and right end cap sealing rings 12 are respectively provided between the left and right end caps and the left and right end protrusions. Spacer 16 is provided on the protrusion of the left end cap 8 to reduce the cavity space and achieve rapid argon filling. The right end cap 14 is provided with an air inlet 15, which is connected to the air inlet quick connector 28 fixed on the fixed bracket 23 through a hose. The small cylinder 11 has 78 evenly distributed double-row vent holes 10 for uniform gas reception, which are connected to the large cylinder 3 through the vent holes 10 and the vent hose 7.

[0029] The large cylinder 3 is provided with a left airbag 2 and a right airbag 5 on the steps on the left and right sides. A left baffle 1 and a right baffle 21 are provided on both sides of the left airbag 2 and the right airbag 5. A fixed bracket 23 is provided on the right baffle 21 for connecting and strengthening the stability of the small cylinder. The fixed bracket 23 is provided with an exhaust quick connector 1 26, an exhaust quick connector 27, an intake quick connector 28 and an oxygen measuring quick connector 29 respectively. The large cylinder 3 is provided with an oxygen measuring port 20 and two exhaust ports 4. The oxygen meter 31 is directly connected to the oxygen measuring quick connector 29 on the fixed bracket 23 through a hose. The traction rope 30 is assembled on the lifting ring 22 for quickly pulling out from inside the pipe after welding.

[0030] The wheel seat assembly 6 is mounted on the left side baffle 1 and the right side baffle 21 respectively. The lifting ring 22 and the handle 24 are mounted on the fixed bracket 23. The structure of the wheel seat assembly 6 is the existing structure, and will not be described in detail here.

[0031] The airflow direction of this utility model is as follows: The oxygen measuring port 20 is connected to the oxygen measuring quick connector 29 via the oxygen measuring hose 19. The oxygen measuring quick connector 29 is connected to the oxygen meter 31 for real-time monitoring.

[0032] The left and right airbags are connected to the argon cylinder for inflation and deflation via quick-connect plug 1 (32) and quick-connect plug 2 (32).

[0033] The quick-connect connector 28 purifies the small cylinder 11 with argon through the air inlet 15. The argon gas inside the small cylinder 11 is then sent into the large cylinder 3 through the ventilation hose 7 connected to the vent 10 for purging. After purging, the air inside the large cylinder 3 is discharged through the two vent holes 4 on the large cylinder 3, connected to the first vent hose 17 and the second vent hose 18, and through the quick-connect connectors 26 and 27. The usage process of this utility model (see...) Figure 4 ): Before welding begins after the pipe assembly, first connect the quick-connect plug 28 on the fixed bracket 23 using the gas pipe from the argon cylinder. Connect the oxygen meter 31 to the quick-connect plug 29 using a flexible hose and plug in the power supply to the oxygen meter 31. Then adjust the height of the wheel assembly 6 according to the pipe diameter and wall thickness to ensure that each wheel assembly 6 is evenly stressed when the present invention enters the pipe. Insert the present invention into the pipe, aligning the center of the annular cavity of the large cylinder 3 with the weld seam. Use the external control check valve to inflate the left airbag 2 and the right airbag 5 sequentially, forming a sealed annular cavity with the large cylinder 3. Connect the quick-connect plug 28. Argon gas is buffered in the annular cavity inside the small cylinder 11, and then enters the sealed annular cavity of the large cylinder 3 and the left and right air bladders 2 and 5 through the ventilation hose 7, so that it is quickly filled with argon gas. The gas is then directly blown onto the back of the weld through the evenly distributed vent holes on the circumference of the large cylinder 3, and the air is discharged through the vent 4. Welding begins when the oxygen content of the oxygen analyzer 31 drops below 200 PPM. The argon gas effectively protects the back of the weld. During the entire root welding process, the oxygen analyzer 31 can be connected to monitor the gas protection effect in real time. After the root welding is completed, the device can be removed.

[0034] Experimental testing showed that when welding φ610mm pipes, using this invention can reduce the oxygen content in the protective gas cavity on the back of the weld to about 200PPM within 1 to 2 minutes.

[0035] Many specific details have been set forth in the foregoing description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed above.

[0036] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A back protection device for pipe welds, characterized in that... , including a large cylinder (3) and a small cylinder (11) fitted inside the large cylinder (3); Airbags are installed on the steps on the left and right sides of the large cylinder (3). The large cylinder (3) is also equipped with two air outlets (4), an oxygen measuring port (20), and a fixed bracket (23). The fixed bracket (23) is equipped with an air outlet quick connector one (26), an air outlet quick connector two (27), an air inlet quick connector (28), and an oxygen measuring quick connector (29). The large cylinder (3) is equipped with an oxygen measuring port (20), which is connected to the oxygen meter (31) through an oxygen measuring hose (19). The small cylinder (11) is hollow and has protrusions at both ends. A left end cap (8) and a right end cap (14) are respectively fitted on the protrusions at both ends. A spacer (16) is provided on the left protrusion of the small cylinder (11), and an air inlet (15) is provided on the right end cap (14). The air inlet (15) is fixed to the air inlet quick connector (28) through a hose. Ventilation holes (10) are evenly distributed on the circumference of the small cylinder (11). Each ventilation hole (10) is connected to the large cylinder (3) through a ventilation hose (7).

2. The back protection device for pipe welds according to claim 1, characterized in that, Each airbag has a baffle on its side, and a wheel seat assembly (6) is mounted on the baffle.

3. A back protection device for pipe welds according to claim 1 or 2, characterized in that, The fixed bracket (23) is set on one side baffle of the large cylinder (3).

4. A back protection device for pipe welds according to claim 3, characterized in that, The left and right end caps of the small cylinder (11) are respectively provided with sealing rings between the small cylinder (11), and the small cylinder (11) is fixedly connected to the left and right end caps by bolts.

5. A back protection device for pipe welds according to claim 4, characterized in that, The fixed bracket (23) is provided with a lifting ring (22) and a handle (24).

6. A back protection device for pipe welds according to claim 5, characterized in that, The small holes on the circumference of the small cylinder (11) are arranged in two rows.

7. A back protection device for pipe welds according to claim 6, characterized in that, The left and right airbags of the large cylinder (3) are respectively equipped with quick-connect fittings for inflation and deflation.

8. A back protection device for pipe welds according to claim 5, characterized in that, A traction rope (30) is provided on the lifting ring (22).

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