Large diameter pipe welding root gas shield

Abstract

The utility model provides a kind of big diameter pipeline factory pre-configuration time welding root gas protection device, including gas protection cylinder, protective cover, movable sleeve and elastic positioning seat, gas protection cylinder lower end is equipped with protective cover, the protective cover bottom camber is adapted with big diameter pipeline body inner ring camber, gas protection cylinder upper end is equipped with movable sleeve movably, movable sleeve top is equipped with elastic positioning seat, elastic positioning seat top is equipped with mounting groove, first guide pulley is rotatably equipped in mounting groove, second guide pulley is rotatably equipped in the both sides below inside protective cover, and the bottom of multiple second guide pulleys extends the bottom of protective cover;The utility model protective cover bottom camber is adapted with big diameter pipeline body inner ring camber so that protective cover can be attached to big diameter pipeline body inner wall, operator makes a device by hand gas protection cylinder so that gas protection is located at weld, without filling protective gas in advance in the process to big diameter pipeline body interior, convenient to use, easy to operate.

Description

Technical Field

[0001] This utility model relates to the field of pipeline welding technology, and in particular to a gas protection device for the root of large-diameter pipeline welding. Background Technology

[0002] For heat-resistant steel pipes and stainless steel pipes with a chromium content greater than 3% or a total alloy content greater than 5%, the inner wall or back of the weld should be protected with an inert gas such as argon during welding at the pipe joint to prevent oxidation of the root weld. The existing construction method involves using cardboard pasted inside the pipe 200mm on each side of the weld to form a gas chamber, and then inserting a gas pipe into the pipe bevel gap to fill with argon for protection. However, this method has the following disadvantages: ① It requires filling the gas chamber 1-2 hours in advance before welding, wasting gas; ② When welding to the argon-filled gas pipe position, the gas pipe needs to be removed, which may result in poor gas protection and welding defects at that position; ③ After welding, cardboard and other debris remain inside the pipe, making cleaning difficult and affecting the cleanliness of the pipe; ④ During welding, the weld bevel needs to be filled with soft paper to prevent gas leakage, making it impossible to observe the welding quality at the pipe root. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a gas protection device for the weld root of a large-diameter pipe. The bottom arc of the protective cover is adapted to the inner arc of the large-diameter pipe body so that the protective cover can be attached to the inner wall of the large-diameter pipe body. The operator holds the gas protection cylinder to place the device at the weld seam for gas protection. In this process, there is no need to fill the large-diameter pipe body with protective gas in advance. It is convenient to use and simple to operate.

[0004] The technical solution adopted by this utility model to solve the technical problem is as follows:

[0005] A gas protection device for the weld root of a large-diameter pipe includes a gas protection cylinder, a protective cover, a movable sleeve, and an elastic positioning seat. The protective cover is located at the lower end of the gas protection cylinder, and the bottom curvature of the protective cover is adapted to the inner curvature of the large-diameter pipe body. The gas protection cylinder is connected to the interior of the protective cover. A gas interface is provided on the gas protection cylinder. A movable sleeve is movably provided at the upper end of the gas protection cylinder. An elastic positioning seat is provided at the top of the movable sleeve. An installation groove is provided at the top of the elastic positioning seat. A first guide wheel is rotatably provided in the installation groove. Multiple sets of the first guide wheels are provided, and the tops of the multiple sets of the first guide wheels extend beyond the top of the installation groove. Second guide wheels are rotatably provided on both sides of the lower interior of the protective cover. Multiple sets of the second guide wheels are provided, and the bottoms of the multiple sets of the second guide wheels extend beyond the bottom of the protective cover.

[0006] A further improvement is that an anti-slip sleeve is provided on the outer wall of the gas protective cylinder below the gas interface, and a black glass window is provided on the front of the protective cover.

[0007] A further improvement is that: a first spring is provided on the outer wall of the gas protection cylinder, a movable ball is provided at one end of the first spring, and a positioning hole is provided on the side wall of the movable sleeve. Multiple sets of positioning holes are provided, and the positioning holes are adapted to the movable ball.

[0008] A further improvement is that the elastic positioning seat includes a base plate, a top plate, and an elastic element. The top of the movable sleeve is provided with a base plate, the top of the base plate is provided with an elastic element, and the upper end of the elastic element is provided with a top plate.

[0009] A further improvement is that the curvature of the top plate is adapted to the curvature of the inner ring of the large-diameter pipe body, and the mounting groove is set on the top of the top plate.

[0010] A further improvement is that: the elastic element is provided in at least two sets, the elastic element includes a positioning sleeve, a movable rod and a second spring, the top of the bottom plate is provided with a positioning sleeve, the movable rod is slidably provided inside the positioning sleeve, the second spring is sleeved on the outside of the movable rod, the lower end of the second spring is connected to the top of the positioning sleeve, and the upper ends of the movable rod and the second spring are both connected to the bottom of the top plate.

[0011] The beneficial effects of this utility model are as follows: This utility model sets up a gas protection device consisting of a gas protection cylinder, a protective cover, a movable sleeve, and an elastic positioning seat. The bottom curvature of the protective cover is adapted to the inner curvature of the large-diameter pipe body, so that the protective cover can be attached to the inner wall of the large-diameter pipe body. The operator holds the gas protection cylinder to place the device at the weld seam for gas protection. In this process, there is no need to fill the large-diameter pipe body with protective gas in advance. It can be used as soon as welding is performed, which is highly convenient.

[0012] This utility model, by rotatably setting second guide wheels on both sides of the lower part of the protective cover, ensures that the bottom of the protective cover is always at the weld seam when the large-diameter pipe body is rotated for welding. This not only avoids the large-diameter pipe body from being obstructed from rotating, but also keeps the protective cover in place to avoid excessive gas leakage caused by movement.

[0013] This invention allows the device to be moved on the gas protection cylinder by setting a movable sleeve, so that the overall length of the device can be adapted to the inner diameter of the large-diameter pipe body, which facilitates the improvement of the positioning stability of the device during use. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention in use.

[0015] Figure 2 This is a three-dimensional structural schematic diagram of the present utility model;

[0016] Figure 3 This is a three-dimensional schematic diagram of the elastic positioning seat structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the movable ball bearing installation structure of this utility model.

[0018] The components include: 1. Gas protection cylinder; 2. Protective cover; 3. Movable sleeve; 4. Elastic positioning seat; 401. Base plate; 402. Top plate; 403. Elastic element; 5. Large-diameter pipe body; 6. Gas interface; 7. First guide wheel; 8. Second guide wheel; 9. Anti-slip sleeve; 10. Black glass window; 11. Movable ball bearing; 12. Positioning hole. Detailed Implementation

[0019] The present invention will be further explained and described below with reference to the accompanying drawings:

[0020] according to Figure 1-4 As shown, this embodiment proposes a gas protection device for the welded root of a large-diameter pipe, including a gas protection cylinder 1, a protective cover 2, a movable sleeve 3, and an elastic positioning seat 4. The protective cover 2 is provided at the lower end of the gas protection cylinder 1. The bottom curvature of the protective cover 2 is adapted to the inner curvature of the large-diameter pipe body 5. The gas protection cylinder 1 and the protective cover 2 are internally connected. A gas interface 6 is provided on the gas protection cylinder 1. The movable sleeve 3 is movably provided at the upper end of the gas protection cylinder 1. An elastic positioning seat 4 is provided at the top of the movable sleeve 3. An installation groove is provided at the top of the elastic positioning seat 4. A first guide wheel 7 is rotatably provided in the installation groove. Multiple sets of the first guide wheels 7 are provided. The tops of the multiple sets of the first guide wheels 7 extend out of the top of the installation groove. Second guide wheels 8 are rotatably provided on both sides of the lower part of the protective cover 2. Multiple sets of the second guide wheels 8 are provided. The bottoms of the multiple sets of the second guide wheels 8 extend out of the bottom of the protective cover 2.

[0021] When using the gas protection device for the weld root of the large-diameter pipe of this utility model, the device is placed inside the large-diameter pipe body 5, so that the protective cover 2 is attached to the inner wall of the large-diameter pipe body 5 through the second guide wheel 8. During this process, the weld is controlled to be within the coverage area of ​​the protective cover 2. Then, by connecting the external argon gas pipe to the gas interface 6, argon gas is filled into the gas protection cylinder 1 and the protective cover 2, and then the argon gas protects the weld.

[0022] The outer wall of the gas protective cylinder 1 below the gas interface 6 is provided with an anti-slip sleeve 9, and the front of the protective cover 2 is provided with a black glass window 10. This invention, by providing the anti-slip sleeve 9, allows the operator to easily hold and use the device by hand at the anti-slip sleeve 9. The black glass window 10 facilitates welding work inside the protective cover 2. Example

[0023] according to Figure 1-4As shown, this embodiment proposes a gas protection device for the welded root of a large-diameter pipe, including a gas protection cylinder 1, a protective cover 2, a movable sleeve 3, and an elastic positioning seat 4. The protective cover 2 is provided at the lower end of the gas protection cylinder 1. The bottom curvature of the protective cover 2 is adapted to the inner curvature of the large-diameter pipe body 5. The gas protection cylinder 1 and the protective cover 2 are internally connected. A gas interface 6 is provided on the gas protection cylinder 1. The movable sleeve 3 is movably provided at the upper end of the gas protection cylinder 1. An elastic positioning seat 4 is provided at the top of the movable sleeve 3. An installation groove is provided at the top of the elastic positioning seat 4. A first guide wheel 7 is rotatably provided in the installation groove. Multiple sets of the first guide wheels 7 are provided. The tops of the multiple sets of the first guide wheels 7 extend out of the top of the installation groove. Second guide wheels 8 are rotatably provided on both sides of the lower part of the protective cover 2. Multiple sets of the second guide wheels 8 are provided. The bottoms of the multiple sets of the second guide wheels 8 extend out of the bottom of the protective cover 2.

[0024] A first spring is provided on the outer wall of the gas protection cylinder 1, and a movable ball 11 is provided at one end of the first spring. A positioning hole 12 is provided on the side wall of the movable sleeve 3. Multiple sets of positioning holes 12 are provided, and the positioning holes 12 are adapted to the movable ball 11. The movable sleeve 3 of this invention can move on the gas protection cylinder 1. Specifically, by pressing the movable ball 11, the first spring is compressed, and then the movable sleeve 3 is moved, causing the movable ball 11 to engage with the corresponding positioning hole 12 for locking.

[0025] The elastic positioning seat 4 includes a base plate 401, a top plate 402, and an elastic element 403. The top of the movable sleeve 3 is provided with the base plate 401, the top of the base plate 401 is provided with the elastic element 403, and the top of the elastic element 403 is provided with the top plate 402. The curvature of the top of the top plate 402 is adapted to the curvature of the inner ring of the large-diameter pipe body 5, and the mounting groove is provided on the top of the top plate 402. At least two sets of elastic elements 403 are provided. Each elastic element 403 includes a positioning sleeve, a movable rod, and a second spring. The top of the base plate 401 is provided with a positioning sleeve, the movable rod is slidably provided inside the positioning sleeve, and the second spring is sleeved on the outside of the movable rod. The lower end of the second spring is connected to the top of the positioning sleeve, and the upper ends of the movable rod and the second spring are both connected to the bottom of the top plate 402. In this utility model, when the movable sleeve 3 moves on the gas protection cylinder 1, it can drive the first guide wheel 7 on the top of the elastic positioning seat 4 to contact the inner wall of the upper part of the large-diameter pipe body 5, so that the entire device is positioned by the inner wall of the large-diameter pipe body 5, which makes it easier for the operator to maintain the stability of the device when holding it. When the large-diameter pipe body 5 is in the rotating position, the elastic element 403 can be compressed, thereby ensuring that the large-diameter pipe body 5 rotates smoothly.

[0026] This invention features a gas protection device consisting of a gas protection cylinder 1, a protective cover 2, a movable sleeve 3, and an elastic positioning seat 4. The bottom curvature of the protective cover 2 matches the inner curvature of the large-diameter pipe body 5, allowing the protective cover 2 to adhere to the inner wall of the large-diameter pipe body 5. The operator holds the gas protection cylinder 1 to position the device at the weld seam for gas protection. This process does not require pre-filling the large-diameter pipe body 5 with protective gas, allowing for immediate use during welding and high convenience. Furthermore, by rotatably installing second guide wheels 8 on both sides of the lower part of the protective cover 2, the bottom of the protective cover 2 remains at the weld seam during welding, preventing obstruction of the large-diameter pipe body 5's rotation and ensuring the protective cover 2 stays in place to avoid excessive gas leakage due to movement. Finally, the movable sleeve 3 allows the device to move on the gas protection cylinder 1, ensuring the overall length of the device matches the inner diameter of the large-diameter pipe body 5, thus improving the positioning stability during use.

[0027] The bottom curvature of this utility model's protective cover is adapted to the inner curvature of the large-diameter pipe body, allowing the protective cover to be attached to the inner wall of the large-diameter pipe body. The operator holds the gas protection cylinder to position the device at the weld seam for gas protection. In this process, there is no need to fill the large-diameter pipe body with protective gas in advance, making it convenient to use and easy to operate.

Claims

1. A gas protection device for the weld root of a large-diameter pipe, characterized in that: The device includes a gas protection cylinder (1), a protective cover (2), a movable sleeve (3), and an elastic positioning seat (4). The lower end of the gas protection cylinder (1) is provided with a protective cover (2). The bottom arc of the protective cover (2) is adapted to the inner arc of the large-diameter pipe body (5). The gas protection cylinder (1) is connected to the inside of the protective cover (2). The gas protection cylinder (1) is provided with a gas interface (6). The upper end of the gas protection cylinder (1) is provided with a movable sleeve (3). The top of the movable sleeve (3) is provided with an elastic positioning seat (4). The top of the elastic positioning seat (4) is provided with an installation groove. The first guide wheel (7) is rotatably provided in the installation groove. The first guide wheel (7) is provided in multiple sets. The top of the multiple sets of the first guide wheel (7) extends out of the top of the installation groove. The lower sides of the inside of the protective cover (2) are provided with second guide wheels (8). The second guide wheels (8) are provided in multiple sets. The bottom of the multiple sets of the second guide wheels (8) extends out of the bottom of the protective cover (2).

2. The gas protection device for the weld root of large-diameter pipes according to claim 1, characterized in that: The gas protective cylinder (1) below the gas interface (6) is provided with an anti-slip sleeve (9), and the protective cover (2) is provided with a black glass window (10) on the front.

3. The gas protection device for the weld root of large-diameter pipes according to claim 1, characterized in that: The outer wall of the gas protection cylinder (1) is provided with a first spring, and one end of the first spring is provided with a movable ball (11). The side wall of the movable sleeve (3) is provided with a positioning hole (12), and multiple sets of positioning holes (12) are provided. The positioning hole (12) is adapted to the movable ball (11).

4. The gas protection device for the weld root of large-diameter pipes according to claim 1, characterized in that: The elastic positioning seat (4) includes a base plate (401), a top plate (402) and an elastic element (403). The top of the movable sleeve (3) is provided with a base plate (401), the top of the base plate (401) is provided with an elastic element (403), and the upper end of the elastic element (403) is provided with a top plate (402).

5. The gas protection device for the weld root of large-diameter pipes according to claim 4, characterized in that: The top curvature of the top plate (402) is adapted to the inner curvature of the large-diameter pipe body (5), and the mounting groove is set on the top of the top plate (402).

6. The gas protection device for the weld root of large-diameter pipes according to claim 4, characterized in that: The elastic element (403) is provided in at least two sets. The elastic element (403) includes a positioning sleeve, a movable rod and a second spring. The top of the bottom plate (401) is provided with a positioning sleeve. The movable rod is slidably provided inside the positioning sleeve. The second spring is sleeved on the outside of the movable rod. The lower end of the second spring is connected to the top of the positioning sleeve. The upper ends of the movable rod and the second spring are both connected to the bottom of the top plate (402).

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