Back welding protection device

Abstract

The invention discloses a back welding protection device and relates to the technical field of welding, the back welding protection device comprises two stainless steel pipes, a protection structure and two deflation structures, pipe openings of the two stainless steel pipes are in butt joint with each other, and the protection structure comprises two balloon assemblies, an inflation pipeline and an exhaust pipeline. The two balloon assemblies and the two stainless steel pipes define a closed cavity, the air outlet end of the inflation pipeline and an air inlet pipe of the exhaust pipeline are both located in the closed cavity, the deflation structure comprises an inflation nozzle, a deflation cylinder, a first elastic piece, an ejector pin, a pull rod, a movable plate and a limiting assembly, the inflation nozzle is installed on the balloon assemblies, and the deflation cylinder is in threaded connection with the inflation nozzle; one end of the first elastic piece is arranged on the movable plate, the other end of the first elastic piece is arranged in the deflation cylinder, one end of the pull rod is arranged on the movable plate, the other end of the pull rod extends out of the deflation cylinder, one end of the ejector pin is arranged on the movable plate, and the other end of the ejector pin extends towards a valve element of the inflation nozzle.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a back-side welding protection device. Background Technology

[0002] With the rapid growth of integrated chemical industry projects, stainless steel materials are becoming more prevalent in various chemical processes. In each newly built unit, stainless steel and alloy pipelines account for ≥50%. To better enable skilled workers to skillfully apply back-side protection measures when welding these materials, and considering the uncertainties in on-site welding, prefabrication, and installation environments, the correct method should be selected and flexibly applied and improved from various process measures such as water-soluble paper protective chamber argon filling, sponge-filled protective chamber argon filling, balloon-filled protective chamber argon filling, manual dragging cover argon filling inside ≥DN600 pipelines, double-person argon arc welding protection, and self-shielded welding wire method.

[0003] The existing balloon inflation and filling method for sealing and argon filling protective gas chambers is suitable for various pipelines that are too long and difficult to fill with argon. However, argon cannot be directly injected into the balloon during inflation. Workers need to inflate the balloon to the appropriate size according to the pipe diameter to determine how much argon needs to be injected. This requires multiple auxiliary processes to complete the sealing preparation work, which affects work efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide a back-side welding protection device, which aims to reduce the balloon inflation process and improve work efficiency.

[0005] To achieve the above objectives, the present invention provides a back-side welding protection device, comprising:

[0006] Two stainless steel pipes, with their ends joined together for welding;

[0007] The protective structure includes two balloon assemblies, an inflation pipe, and an exhaust pipe. The two balloon assemblies are respectively disposed inside the two stainless steel tubes, and the two balloon assemblies and the two stainless steel tubes form a sealed cavity. The air outlet of the inflation pipe and the air inlet of the exhaust pipe are both located inside the sealed cavity. The inflation pipe is used to deliver inert gas into the sealed cavity, and the exhaust pipe is used to extract gas from the sealed cavity.

[0008] Two deflation structures are provided, each including an inflation nozzle, a deflation cylinder, a first elastic element, a pin, a pull rod, a movable plate, and a limiting component. The inflation nozzle is mounted on the balloon assembly, and the deflation cylinder is threadedly connected to the inflation nozzle. The movable plate is movably mounted inside the deflation cylinder and moves towards or away from the inflation nozzle. One end of the first elastic element is disposed on the movable plate, and the other end is disposed inside the deflation cylinder. One end of the pull rod is disposed on the movable plate, and the other end extends outside the deflation cylinder. One end of the pin is disposed on the movable plate, and the other end extends towards the valve core of the inflation nozzle. The limiting component includes a connector that is inserted into the deflation cylinder to restrict the pin from moving towards the valve core of the inflation nozzle.

[0009] Preferably, the balloon assembly includes multiple balloons, which are arranged sequentially from the inside out.

[0010] Preferably, the balloon is a yoga ball.

[0011] Preferably, the innermost yoga ball is provided with the inflation nozzle.

[0012] Preferably, the inflation nozzle is bent towards the ground.

[0013] Preferably, the inflation nozzle is provided with a pressure core structure, the pressure core structure comprising:

[0014] A second elastic element is disposed inside the inflation nozzle;

[0015] The pressure block is disposed on the second elastic member, inclined toward one side of the inflation nozzle valve core, and abuts against the inflation nozzle valve core.

[0016] Preferably, a limiting rod is provided inside the inflation nozzle, and the limiting rod passes through the pressure core block to limit the movement direction of the pressure core block.

[0017] Preferably, the limiting component further includes:

[0018] A pull ring is provided on the limiting member and is located on the deflation cylinder away from the balloon;

[0019] A third elastic element is disposed between the pull ring and the venting cylinder.

[0020] Preferably, each of the two pull rings is provided with a connecting rope, and the connecting rope extends beyond the stainless steel pipe.

[0021] Preferably, the length of the ejector pin is greater than the length of the inflation nozzle.

[0022] In the technical solution provided by this invention, the deflation structure includes an inflation nozzle, a deflation cylinder, a first elastic element, a pin, a pull rod, a movable plate, and a limiting component. The inflation nozzle is installed on the balloon assembly, the deflation cylinder is threadedly connected to the inflation nozzle, the movable plate is movably installed inside the deflation cylinder and moves towards or away from the inflation nozzle, one end of the first elastic element is disposed on the movable plate, and the other end is disposed inside the deflation cylinder, one end of the pull rod is disposed on the movable plate, and the other end extends outside the deflation cylinder, one end of the pin is disposed on the movable plate, and the other end extends towards the valve core of the inflation nozzle, and the limiting component includes a connector that is inserted into the deflation cylinder to restrict the pin from moving towards the valve core of the inflation nozzle. The deflation structure allows workers to easily adjust the size of the balloon according to the diameter of the stainless steel tube after inflation to accommodate different sizes of stainless steel tubes. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A perspective view of an embodiment of the back welding protection device provided by the present invention;

[0025] Figure 2 for Figure 1 Schematic cross-sectional view of the gas release structure;

[0026] Figure 3 for Figure 1 A schematic diagram of the structure of the central air inlet.

[0027] Explanation of icon numbers:

[0028] 100. Backside welding protection device; 1. Stainless steel pipe; 2. Deflator structure; 21. Pull rod; 22. Deflator cylinder; 23. First elastic element; 24. Movable plate; 25. Ejector pin; 26. Limiting component; 261. Limiting element; 262. Third elastic element; 263. Pull ring; 3. Protective structure; 31. Exhaust pipe; 32. Balloon assembly; 33. Inflation pipe; 4. Inflation nozzle; 5. Core pressing structure; 51. Second elastic element; 52. Limiting rod; 53. Core pressing block.

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] This invention provides a back-side welding protection device 100. Figures 1 to 3 This is an embodiment of the back welding protection device 100 provided by the present invention.

[0034] Please refer to the following: Figures 1 to 3The back welding protection device 100 includes two stainless steel pipes 1, a protective structure 3, and two venting structures 2. The ends of the two stainless steel pipes 1 are connected for welding. The protective structure 3 includes two balloon assemblies 32, an inflation pipe 33, and an exhaust pipe 31. The two balloon assemblies 32 are respectively disposed within the two stainless steel pipes 1, forming a sealed cavity. The outlet end of the inflation pipe 33 and the inlet pipe of the exhaust pipe 31 are both located within the sealed cavity. The inflation pipe 33 is used to supply inert gas into the sealed cavity, and the exhaust pipe 31 is used to extract gas from the sealed cavity. The venting structure 2 includes an inflation nozzle 4, a venting cylinder 22, a first elastic element 23, and a top. The balloon assembly 32 includes a needle 25, a pull rod 21, a movable plate 24, and a limiting component 26. An inflation nozzle 4 is mounted on the balloon assembly 32. An air release cylinder 22 is threadedly connected to the inflation nozzle 4. The movable plate 24 is movably mounted inside the air release cylinder 22 and moves towards or away from the inflation nozzle 4. One end of the first elastic element 23 is disposed on the movable plate 24, and the other end is disposed inside the air release cylinder 22. One end of the pull rod 21 is disposed on the movable plate 24, and the other end extends outside the air release cylinder 22. One end of the ejector pin 25 is disposed on the movable plate 24, and the other end extends towards the valve core of the inflation nozzle 4. The limiting component 26 includes a connector that is inserted into the air release cylinder 22 to restrict the ejector pin 25 from moving towards the valve core of the inflation nozzle 4.

[0035] Before welding, clean the inner cavities of the two stainless steel tubes 1 to prevent the balloons from being punctured after inflation. Then, insert the inflation end of the inflation pipe 33 (for conveying inert gas) into one of the stainless steel tubes 1, facing the pipe opening. Insert the exhaust end of the exhaust pipe 31 (for extracting gas) into the other stainless steel tube 1, also facing the pipe opening. Both the inflation end of the inflation pipe 33 and the exhaust end of the exhaust pipe 31 should be a certain distance from the joint of the two stainless steel tubes 1. For example, when the length of a single stainless steel tube 1 is 450 mm, the distance from the inflation end of the inflation pipe 33 and the exhaust end of the exhaust pipe 31 to the pipe opening should be at least 200 mm. Next, place the two balloon assemblies 32 into the two stainless steel tubes 1 respectively. This process involves cutting a single stainless steel tube 1 into two spaces, then connecting and fixing the ends of the two stainless steel tubes 1 together, so that the balloon assembly 32 and the two stainless steel tubes 1 form a sealed cavity. When the inert gas supplied to the sealed cavity is argon, the inflation pipe 33 is placed at the bottom of one stainless steel tube 1 and at the top of the other stainless steel tube 1. This allows air to be automatically discharged from the exhaust pipe 31 when the inflation pipe 33 is filling the sealed space with argon. At the same time, valves are installed on both the inflation pipe 33 and the exhaust pipe 31 to close the pipes after the sealed cavity is filled with inert gas, preventing the inert gas from leaking out and losing its protective function. Welding can begin after the inert gas is filled.

[0036] The balloon assembly 32 with a closed inner cavity typically consists only of a balloon. After welding, the balloon needs to be deflated. Normally, the inflation port of the balloon is tied with a string, and deflation is simply achieved by untying the string. However, over-inflation can occur during inflation, causing the balloon to burst. Therefore, a separate inflation structure is needed. A tire-like inflation nozzle 4 is installed on the balloon. The inflation port of the nozzle 4 has an external thread, and one end of the deflation cylinder 22 has an internal thread. The external thread on the inflation nozzle 4 and the internal thread on the deflation cylinder 22 are connected together. The elastic element 23 uses its elastic potential energy to push the movable plate 24 toward the inflation nozzle 4. The ejector pin 25 moves along with the movable plate 24 and moves toward the valve core of the inflation nozzle 4 until the ejector pin 25 hits the valve core of the inflation nozzle 4, thereby pressing the valve core of the inflation nozzle 4 inward, thus causing the inflation nozzle 4 to release air. When it is not necessary to release air, the limiting element 261 is inserted into the deflation chamber to prevent the ejector pin 25 from moving toward the valve core. The deflation structure 2 allows the balloon to deflate at any time after it is filled with air to change its volume to fit the diameter of the stainless steel tube 1. At the same time, it can also seal the balloon at any time to prevent air leakage.

[0037] Therefore, in the technical solution provided by the present invention, the deflation structure 2 includes an inflation nozzle 4, a deflation cylinder 22, a first elastic element 23, a pin 25, a pull rod 21, a movable plate 24, and a limiting component 26. The inflation nozzle 4 is installed on the balloon assembly 32, the deflation cylinder 22 is threadedly connected to the inflation nozzle 4, the movable plate 24 is movably installed inside the deflation cylinder 22, and moves towards or away from the inflation nozzle 4. One end of the first elastic element 23 is disposed on the movable plate 24, and the other end is disposed on the deflation cylinder 22. Inside the 2nd section, one end of the pull rod 21 is mounted on the movable plate 24, and the other end extends to the outside of the deflation cylinder 22. One end of the ejector pin 25 is mounted on the movable plate 24, and the other end extends toward the valve core of the inflation nozzle 4. The limiting component 26 includes a connector that is inserted into the deflation cylinder 22 to restrict the ejector pin 25 from moving toward the valve core of the inflation nozzle 4. The deflation structure 2 allows the operator to adjust the size of the balloon according to the diameter of the stainless steel tube 1 after inflation to accommodate different sizes of stainless steel tubes 1.

[0038] The debris inside the stainless steel tube 1 is difficult to clean completely, and the high temperature during welding will also affect the balloon. In order to ensure that the balloon is not damaged during placement or is not broken due to high temperature during welding, it is necessary to increase the number of balloon layers. Specifically, in the embodiment of the present invention, the balloon assembly 32 includes multiple balloons, and each balloon is arranged sequentially from the inside to the outside.

[0039] Each balloon assembly 32 is composed of multiple balloons, with multiple balloons nested inside each other, so that the balloons inside each stainless steel tube 1 are composed of multiple layers of balloons, thus ensuring that even if the outermost layer of the balloon is damaged, the inner balloons can still form a sealed cavity.

[0040] Furthermore, the balloon is a yoga ball.

[0041] Ordinary balloons are easily punctured all at once when there aren't enough layers, and they can also melt and break at high temperatures, significantly increasing usage costs. Therefore, we switched to using yoga balls, which are wear-resistant, heat-resistant, and scratch-resistant. Yoga balls also use a multi-layered design, with an inflation nozzle 4 on the innermost layer. The other yoga balls, which are layered one at a time, do not have inflation nozzles 4. When the innermost layer's inflation nozzle 4 is inflated, it expands the outer yoga balls as well. Because yoga balls are scratch-resistant, even the outermost yoga ball can be punctured by small debris. Even if it is punctured, the inner layers of yoga balls can still be used normally. Yoga balls can also withstand the high temperatures generated during welding.

[0042] Furthermore, the innermost yoga ball is provided with the inflation nozzle 4.

[0043] When setting up a multi-layered yoga ball, a corresponding inflation structure is required. If each layer of yoga ball has an inflation nozzle 4, the outermost yoga ball needs to have multiple holes for the inflation nozzle 4 to pass through. Furthermore, if each layer of yoga ball is inflated, they will interfere with each other and fail to seal the stainless steel tube 1. Therefore, it is only necessary to set an inflation nozzle 4 on the innermost yoga ball and set an opening for the inflation nozzle 4 to pass through on the other layers of yoga balls. After the innermost yoga ball is fully inflated, it can support the outer yoga ball and thus seal the stainless steel tube 1.

[0044] If the inflation nozzle 4 is straight, it is easy to sink into the multi-layered yoga ball when it is not inflated. Therefore, it is necessary to change the shape of the inflation nozzle 4 so that it is difficult for the inflation nozzle 4 to sink into the yoga ball. Specifically, in the embodiment of the present invention, the inflation nozzle 4 is bent towards the ground.

[0045] Furthermore, the inflation nozzle 4 is provided with a pressure core structure 5, which includes a second elastic element 51 and a pressure core block 53. The second elastic element 51 is disposed inside the inflation nozzle 4, and the pressure core block 53 is disposed on the second elastic element 51, inclined toward the valve core of the inflation nozzle 4, and abutting against the valve core of the inflation nozzle 4.

[0046] When the inflation nozzle 4 is designed to be bent, the ejector pin 25 can only move in a straight line and is unlikely to hit the valve core of the inflation nozzle 4. Therefore, other structures are needed to enable the ejector pin 25 to hit the valve core even when moving in a straight line. When the ejector pin 25 moves into the inflation nozzle 4, it simultaneously pushes the pressure core block 53 to move together. As the pressure core block 53 moves, it uses the inclined surface to press the valve core of the inflation nozzle 4 into the inflation nozzle 4, thereby realizing the air release action. When the ejector pin 25 retracts, the second elastic element 51 can push the pressure core block 53 back to its original position, thereby causing the valve core to return to its original position and stop the air release action. When the pressure core block 53 is not pushed by the ejector pin 25, only one side is in contact with the inner cavity of the inflation nozzle 4, thus leaving enough space for the inflation nozzle 4 to release or inflate.

[0047] Furthermore, a limiting rod 52 is provided inside the inflation nozzle 4, which passes through the pressure core block 53 and is used to restrict the movement direction of the pressure core block 53.

[0048] The movement trajectory of the pressure core block 53 needs to be restricted. If the movement trajectory of the pressure core block 53 deviates, the pressure core block 53 will be unable to impact and compress the valve core to achieve air release or inflation. Therefore, a limit rod 52 is set. The limit rod 52 extends according to the preset movement trajectory of the pressure core block 53, and then the limit rod 52 passes through the pressure core block 53 so that it can only move according to the preset movement trajectory.

[0049] The limiting component 26 not only has a limiting member 261 for restricting the movement of the ejector pin 25, but also a structure to assist the limiting member 261 in resetting. Specifically, in the embodiment of the present invention, the limiting component 26 further includes a pull ring 263 and a third elastic member 262, which are disposed on the limiting member 261 and located on the venting cylinder 22 away from the balloon. The third elastic member 262 is disposed between the pull ring 263 and the venting cylinder 22.

[0050] When it is necessary to release the limiting member 261 from the air vent 22 and remove the restriction on the ejector pin 25, pull the pull ring 263. The pull ring 263 drives the limiting member 261 to move out of the air vent 22 together and stretches the third elastic member 262, thereby releasing the restriction on the ejector pin 25. When it is necessary to reset the ejector pin 25, pull the pull rod 21, so that the pull rod 21 pulls the ejector pin 25 to the initial position through the movable plate 24 and compresses the first elastic member 23. At the same time, the pull ring 263 needs to be released. The third elastic member 262 pulls the limiting member 261 back to the initial position and inserts it into the air vent 22, thereby blocking the ejector pin 25. Under the action of the first elastic member 23, the ejector pin 25 is also difficult to move into the inflation nozzle 4. The first elastic member 23, the second elastic member 51 and the third elastic member 262 can all be springs.

[0051] Furthermore, each of the two pull rings 263 is provided with a connecting rope, and the connecting rope extends to the outside of the stainless steel pipe 1.

[0052] Some stainless steel pipes 1 are quite long, making it difficult for workers to reach the pull ring 263 and the pull rod 21. Therefore, a corresponding connecting rope is set on the pull ring 263. By simply pulling the connecting rope, the pull ring 263 can be moved away from the venting cylinder 22, thereby moving the limiting component 261 together, thus releasing the restriction on the ejector pin 25, allowing the valve core of the inflation nozzle 4 to compress and release air, thereby realizing remote venting.

[0053] In order to ensure that the ejector pin 25 can hit the intermediate pressure core block 53, the length of the ejector pin 25 needs to be limited. Specifically, in the technical solution of the present invention, the length of the ejector pin 25 is greater than the length of the air inlet 4.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A back-side welding protection device, characterized in that, include: Two stainless steel pipes, with their ends joined together for welding; The protective structure includes two balloon assemblies, an inflation pipe, and an exhaust pipe. The two balloon assemblies are respectively disposed inside the two stainless steel tubes, and the two balloon assemblies and the two stainless steel tubes form a sealed cavity. The air outlet of the inflation pipe and the air inlet of the exhaust pipe are both located inside the sealed cavity. The inflation pipe is used to deliver inert gas into the sealed cavity, and the exhaust pipe is used to extract gas from the sealed cavity. Two deflation structures are provided, each including an inflation nozzle, a deflation cylinder, a first elastic element, a pin, a pull rod, a movable plate, and a limiting component. The inflation nozzle is mounted on the balloon assembly, and the deflation cylinder is threadedly connected to the inflation nozzle. The movable plate is movably mounted inside the deflation cylinder and moves towards or away from the inflation nozzle. One end of the first elastic element is disposed on the movable plate, and the other end is disposed inside the deflation cylinder. One end of the pull rod is disposed on the movable plate, and the other end extends outside the deflation cylinder. One end of the pin is disposed on the movable plate, and the other end extends towards the valve core of the inflation nozzle. The limiting component includes a connector that is inserted into the deflation cylinder to restrict the pin from moving towards the valve core of the inflation nozzle.

2. The back welding protection device as described in claim 1, characterized in that, The balloon assembly includes multiple balloons, which are arranged sequentially from the inside out.

3. The back welding protection device as described in claim 2, characterized in that, The balloon in question is a yoga ball.

4. The back-side welding protection device as described in claim 2, characterized in that, The innermost yoga ball is provided with the inflation nozzle.

5. The back welding protection device as described in claim 1, characterized in that, The inflation nozzle is bent towards the ground.

6. The back-side welding protection device as described in claim 5, characterized in that, The inflation nozzle is provided with a pressure core structure, the pressure core structure comprising: A second elastic element is disposed inside the inflation nozzle; The pressure block is disposed on the second elastic member, inclined toward one side of the inflation nozzle valve core, and abuts against the inflation nozzle valve core.

7. The back-side welding protection device as described in claim 6, characterized in that, A limit rod is provided inside the inflation nozzle, and the limit rod passes through the pressure core block to limit the movement direction of the pressure core block.

8. The back welding protection device as described in claim 2, characterized in that, The limiting component also includes: A pull ring is provided on the limiting member and is located on the deflation cylinder away from the balloon; A third elastic element is disposed between the pull ring and the venting cylinder.

9. The back welding protection device as described in claim 8, characterized in that, Both of the pull rings are provided with connecting ropes, and the connecting ropes extend outside the stainless steel pipe.

10. The back-side welding protection device as described in claim 1, characterized in that, The length of the ejector pin is greater than the length of the inflation nozzle.

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