Quickly disassembled pipe welding argon filling tool

Abstract

The utility model discloses a quick dismounting type pipeline welding argon filling frock, include: connecting piece, first plugging subassembly and second plugging subassembly are arranged respectively in the both ends of connecting piece, and first plugging subassembly includes first sleeve and at least one first sealing piece with first sleeve coaxial arrangement, and second plugging subassembly includes second sleeve and at least one second sealing piece with second sleeve coaxial arrangement, argon filling subassembly, and argon filling subassembly inserts from the end of first sleeve and fills argon between first plugging subassembly and second plugging subassembly, and argon filling subassembly includes pipeline, and the atomizing mouth with pipeline intercommunication, and is arranged in the exhaust port of second sleeve end. The utility model has the beneficial effects that: the technical scheme of the utility model realizes the core advantage of "quick dismounting, high -efficient argon filling, scene adaptation " through the structure optimization, and the pipeline welding efficiency and quality are improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, and in particular to a quick-assembly and disassembly type argon-filling tool for pipe welding. Background Technology

[0002] In metal pipe welding, for reactive metal materials such as stainless steel and titanium alloys, the high-temperature molten pool and heat-affected zone are prone to react with oxygen and nitrogen in the air during the welding process, generating defects such as oxide films and nitrides (e.g., porosity, slag inclusions, embrittlement layers). This leads to a decrease in the mechanical properties of the weld (e.g., reduced strength and toughness), and may even cause safety hazards such as pipeline corrosion and leakage. To solve this problem, the industry generally adopts argon-shielded welding technology, which creates an inert argon atmosphere in the welding area (especially on the back of the weld) to isolate the air from contact with the high-temperature metal and ensure weld quality.

[0003] Currently, argon purging protection for pipeline welding mainly relies on traditional argon purging fixtures, which have the following significant problems in their structure and application:

[0004] Traditional argon-filling fixtures often employ a structure of "gasbag sealing + external support fixing" or "rigid flange + bolt connection". For example, gasbag fixtures require an external air pump to inflate the gasbag to achieve sealing. During installation, the gasbag position needs to be repeatedly adjusted to ensure it is centered. During disassembly, the gas must be released before it can be removed. A single person's operation usually takes more than 10 minutes and requires additional auxiliary equipment such as an air pump. Bolted fixtures require a flange support to be installed on the outer wall of the pipeline, and the internal sealing component is tightened by bolts. Both installation and disassembly require tools, making operation difficult, especially in confined spaces (such as trenches or high-altitude pipelines), which seriously restricts welding efficiency.

[0005] Existing tooling connectors are mostly rigid rod structures, which can only be used for welding straight sections of pipes. For pipes with bends of 90°, 120°, etc. (such as elbows and tees in industrial pipelines), special corner tooling needs to be customized, resulting in a wide variety of tooling types and high inventory costs. At the same time, the sealing component of the plugging assembly has a fixed size, and different pipe diameters (such as DN50, DN100, DN200) require the replacement of the corresponding specification of the plugging component. On-site construction requires carrying multiple sets of tooling, resulting in poor flexibility.

[0006] Traditional argon-filling components typically have a single straight-hole exhaust structure, allowing argon to enter the filling space from a single direction. This results in uneven gas diffusion and slow air exhaust (usually requiring 15-20 minutes of continuous argon filling to achieve a purity of 99.9%). The exhaust port is often an open design without a one-way valve. When argon filling stops or the flow rate decreases, external air can easily flow back into the filling space through the exhaust port. A high flow rate (usually >25L / min) must be maintained continuously to prevent air intrusion, resulting in argon waste (argon loss rate exceeding 20%).

[0007] Traditional tooling often uses a single rubber ring as the sealing element, which is a line contact seal with the inner wall of the pipe. If there are uneven defects such as rust or scratches on the inner wall of the pipe, local leakage is likely to occur (leakage rate > 0.5L / min). The sealing component lacks an effective positioning structure. During the welding process, it is easily affected by arc heat radiation, pipe vibration or thermal deformation, which can cause axial or radial displacement, resulting in changes in the volume of the argon filling space, sealing failure, and ultimately affecting the weld protection effect (the measured weld oxidation rate exceeds 5%).

[0008] In response to the problems of "cumbersome disassembly and assembly, poor adaptability, argon waste, and unreliable sealing and positioning" in the existing technologies, there is an urgent need to develop a new type of argon filling tool that can achieve rapid disassembly and assembly, adapt to multiple scenarios, efficiently fill argon, and provide stable protection. Utility Model Content

[0009] The main technical problem solved by this utility model is to provide a quick-assembly and disassembly type argon purging tool for pipe welding, thereby solving one or more of the above-mentioned prior art problems.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a quick-assembly and disassembly pipe welding argon purging fixture, the innovation of which is: comprising:

[0011] Connectors;

[0012] A first sealing assembly and a second sealing assembly are respectively disposed at both ends of the connector. The first sealing assembly includes a first sleeve and at least one first sealing element coaxially disposed with the first sleeve. The second sealing assembly includes a second sleeve and at least one second sealing element coaxially disposed with the second sleeve.

[0013] An argon-filling assembly is inserted from the end of the first sleeve and fills the space between the first and second sealing assemblies with argon. The argon-filling assembly includes a pipeline, an atomizing port communicating with the pipeline, and an exhaust port disposed at the end of the second sleeve.

[0014] In some embodiments, the connector is a telescopic tube or a flexible component; the telescopic tube has an outlet on its wall for argon gas to enter the argon-filled space; the flexible component is used for welding pipes with bends.

[0015] In some embodiments, the first and second seals are O-rings, lip seals, or elastic expansion rings, and the outer diameter of the seals is interference-fitted with the inner diameter of the pipe to be welded.

[0016] In some embodiments, a one-way valve is provided in the exhaust port, which allows the gas in the argon-filled space to escape and prevents outside air from entering.

[0017] In some embodiments, the outer walls of the first and second sleeves are provided with radially protruding elastic positioning elements for fixing the sealing assembly inside the pipe to be welded.

[0018] In some embodiments, the two ends of the connector are detachably connected to the first sleeve and the second sleeve, respectively, and the connection is provided with a sealing gasket.

[0019] The beneficial effects of this utility model are: this technical solution achieves the core advantages of "rapid assembly and disassembly, efficient argon filling, and scene adaptability" through structural optimization, which significantly improves the efficiency and quality of pipeline welding. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention, which is a quick-assembly and disassembly type argon-filling tool for pipe welding.

[0022] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention, which is a quick-assembly and disassembly type argon-filling tool for pipe welding. Detailed Implementation

[0023] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Example 1: Tooling 100 for expansion joints suitable for welding straight pipes

[0025] This embodiment is designed for welding straight pipe sections. The connector 100 adopts a telescopic pipe structure. The following description will explain the specific structural details, working principle and advantages.

[0026] like Figure 1 As shown, the quick-assembly and disassembly pipe welding argon-filling fixture of this embodiment includes: a first sealing component, a second sealing component, a telescopic pipe connector 100, and an argon-filling component. The first and second sealing components are respectively inserted into the two straight pipe sections to be welded and connected by the telescopic pipe connector 100 to form a closed argon-filling space; the argon-filling component fills this space with argon gas to achieve welding protection.

[0027] The first sealing assembly includes a first sleeve 201 (made of 304 stainless steel, 50-80mm in length, 15-20mm in inner diameter, and 2-3mm smaller in outer diameter than the inner diameter of the pipe to be welded) and two first sealing elements 202 coaxially arranged with the first sleeve 201; the first sealing elements 202 are fluororubber O-rings (5-8mm in cross-sectional diameter), respectively fitted on both ends of the first sleeve 201 (10-15mm from the end of the sleeve); the outer wall of the first sleeve 201 is provided with two radially protruding elastic positioning elements (made of polyurethane, with a natural protrusion height of 3-5mm and a compressed height of 1-2mm).

[0028] The working principle of the first sealing component: the O-ring is interference-fitted with the inner wall of the pipe (interference amount 0.5-1mm), and the gap is filled by the elastic deformation of the rubber to achieve radial sealing; the elastic positioning element generates a reverse elastic force after being squeezed by the inner wall of the pipe, which fixes the first sleeve 201 in the pipe and prevents the sealing component from axially shifting during the welding process.

[0029] Advantages of the first sealing component: The O-ring has a good sealing effect (leakage rate <0.1L / min), and can be disassembled and installed by simply pushing and pulling axially without tools; the elastic positioning component avoids the cumbersome fixing method of traditional tooling that relies on bolts or clamps, and the installation time is reduced by more than 60%.

[0030] The second sealing assembly is symmetrically arranged with the first sealing assembly, including a second sleeve 301 (with the same material and size as the first sleeve 201) and two second seals 302 (with the same material as the first seal 202); the end of the second sleeve 301 away from the welding end is provided with an exhaust port (diameter 8-10mm) and a built-in one-way valve (plastic valve core + spring structure, opening pressure 0.05-0.1MPa).

[0031] The working principle of the second sealing component: the second sealing element 302 achieves a seal with the inner wall of the pipeline; the exhaust port check valve only allows the gas in the argon-filled space to be discharged outward, and the external air cannot enter in the reverse direction due to the weight of the valve core and the spring force.

[0032] The working principle and advantages of the second sealing component: the one-way valve effectively prevents external air backflow during welding (experiments show that the purity of argon gas in the argon-filled space can be stably maintained at over 99.9%), and the exhaust port diameter matches the argon gas flow rate (suitable for argon gas input of 10-20L / min), avoiding excessive pressure that could lead to seal failure.

[0033] The connector 100 is a stainless steel corrugated telescopic pipe (length adjustable range 100-200mm, pipe diameter matches the inner diameter of the first / second sleeve 301), both ends are detachably connected to the first and second sleeves 301 by threads (thread specifications M16-M20, the connection part is equipped with a nitrile rubber sealing gasket, thickness 2-3mm); the telescopic pipe wall has 4 air outlets evenly distributed along the axial direction (diameter 2-3mm, spacing 30-40mm).

[0034] The telescopic tube can be adjusted in length by axial stretching or compression to accommodate welding of straight pipes with different gaps (the pipe butt gap is allowed to be 0-10mm); the outlet is used to introduce argon gas from inside the telescopic tube into the argon filling space, forming a "dual-path gas intake" with the atomizing port of the argon filling component, thereby improving gas diffusion efficiency.

[0035] The telescopic structure is highly adaptable (it can cover straight pipes with a diameter of 50-200mm); the threaded connection and gasket design ensure that there is no air leakage between the connector and the sleeve, and damaged parts (such as gaskets) can be replaced separately after disassembly, reducing maintenance costs by 40%.

[0036] The argon filling assembly includes a pipe 401 (PU material, inner diameter 6-8mm, length 1.5-2m), an atomizing port (located at the end of the pipe 401 into the first sleeve 201, with 4 evenly distributed along the circumference of the pipe 401, with a diameter of 1-2mm and the axis of the atomizing port forming a 45° angle with the axis of the pipe 401), and a valve (brass ball valve, adjustment accuracy ±0.5L / min); the end of the pipe 401 away from the atomizing port is connected to the argon cylinder interface (G3 / 8 thread).

[0037] Working principle of argon filling component: valve controls the on / off of argon gas and flow rate (recommended flow rate 15-20L / min); the atomizing port sprays argon gas at a 45° angle towards the welding area, forming a rotating airflow to accelerate air discharge; after the pipeline 401 is inserted from the end of the first sleeve 201, it is connected to the inside of the telescopic tube, and part of the argon gas is supplemented into the argon filling space through the gas outlet of the telescopic tube.

[0038] Advantages of the argon filling component: The 45° atomizing port creates a spiral flow field of argon gas in the argon filling space, shortening the air discharge time to 3-5 minutes (traditional straight hole gas discharge takes 8-10 minutes); the ball valve has high adjustment accuracy and can dynamically adjust the flow rate according to the pipeline volume, saving more than 30% of argon gas consumption.

[0039] Example 2: Flexible connector 100 tooling suitable for corner pipe welding

[0040] This embodiment is designed for welding pipes at 90° or 120° corners. The connector 100 adopts a flexible structure, and the other components are the same as those in Embodiment 1. Only the connector 100 and some adaptable structures are adjusted.

[0041] The connector 100 is a polytetrafluoroethylene corrugated tube (length 150-200mm, inner diameter same as telescopic tube, bendable angle 0-180°, minimum bending radius 50-80mm), and both ends are connected to the first sleeve 201 and the second sleeve 301 through quick-connect fittings (stainless steel material, insertion and extraction force 50-80N), with O-rings built into the fittings for sealing.

[0042] The corrugated pipe achieves large-angle bending through its pleated structure, adapting to the axial offset of corner pipes (allowable offset angle ≤45°); the quick-connect fittings can be connected by axial insertion and removal without rotation, making them suitable for operation in confined spaces.

[0043] The connector has excellent bending performance (it can work stably in environments ranging from -20℃ to 150℃), covering more than 90% of industrial pipeline corner scenarios; the quick-connect fitting has an assembly and disassembly time of less than 30 seconds, solving the problem of difficult operation of traditional threaded connections at corners.

[0044] The number of elastic positioning elements in the first sleeve 201 and the second sleeve 301 is increased to 3 (evenly distributed along the circumference of the sleeve at 120°), ensuring that the inner wall of the pipe at the corner is subjected to uniform force and improving the positioning stability by 40%.

[0045] Argon filling component pipeline 401 uses flexible PU tubing (bending radius < 20mm) to prevent pipeline 401 from folding and getting blocked at corners.

[0046] The working principle of this technical solution is as follows:

[0047] Installation Phase: Select either Example 1 (straight line) or Example 2 (corner) fixture according to the pipe type. Insert the first sealing component into pipe A to be welded (depth 50-100mm), and the second sealing component into pipe B (same depth). Push the two pipe sections closer together, reducing the distance between the first and second sealing components to 10-20mm (forming an argon-filled space, volume V = πr). 2 L and r are the inner diameter of the pipe, and L is the spacing between the sealing components.

[0048] Argon filling stage: Open the valve of the argon filling component, and argon gas is injected into the argon filling space through pipeline 401 and atomizing port. At the same time, some argon gas is supplemented through the outlet of the telescopic tube / flexible component. The air in the argon filling space is discharged unidirectionally from the exhaust port of the second sleeve 301 under the compression of argon gas. After argon filling for 3-5 minutes, the purity of argon gas is confirmed to be ≥99.9% (oxygen content ≤0.1%) by using an oxygen content detector (placed at the exhaust port).

[0049] Welding stage: Welding begins on the outside. During the welding process, argon gas is continuously supplied (flow rate reduced to 10-15 L / min) until the valve is closed 30 seconds after welding is completed to ensure that the heat-affected zone is completely cooled.

[0050] The advantages of this technical solution are:

[0051] Quick assembly and disassembly: No tools are required, and one person can complete the installation in 2 minutes (traditional tooling requires 2 people and takes more than 10 minutes).

[0052] Wide range of application scenarios: the telescopic pipe is suitable for straight pipes (diameter 50-200mm), and the flexible part is suitable for corner pipes (bending angle 0-180°), covering more than 95% of industrial pipe welding needs.

[0053] High argon utilization rate: The atomizing port and dual-path air intake design shorten the time for argon purity to reach the standard by 50%. Combined with the flow control valve, the overall argon loss rate is <5% (traditional tooling >15%).

[0054] Stable welding quality: The sealing element and one-way valve ensure that the oxygen content in the argon-filled space is <0.1%, and the oxidation rate of the weld joint is reduced to below 0.5% (the oxidation rate of traditional unprotected welding is >5%).

[0055] In summary, this tooling achieves the core advantages of "rapid assembly and disassembly, efficient argon filling, and scenario adaptability" through structural optimization, significantly improving the efficiency and quality of pipeline welding.

[0056] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A quick-assembly and disassembly type argon purging fixture for pipe welding, characterized in that: include: Connector (100); A first sealing assembly and a second sealing assembly are respectively disposed at both ends of the connector (100). The first sealing assembly includes a first sleeve (201) and at least one first sealing element (202) coaxially disposed with the first sleeve (201). The second sealing assembly includes a second sleeve (301) and at least one second sealing element (302) coaxially disposed with the second sleeve (301). An argon-filling assembly is inserted from the end of the first sleeve (201) and fills the space between the first sealing assembly and the second sealing assembly with argon. The argon-filling assembly includes a pipe (401), an atomizing port communicating with the pipe (401), and an exhaust port disposed at the end of the second sleeve (301).

2. The quick-assembly and disassembly pipe welding argon purging fixture according to claim 1, characterized in that: The connector (100) is a telescopic tube or a flexible component; the telescopic tube has an outlet on its wall for argon gas to enter the argon-filled space; the flexible component is used for welding pipes with corners.

3. The quick-assembly and disassembly type argon purging fixture for pipe welding according to claim 1, characterized in that: The first sealing element (202) and the second sealing element (302) are O-rings, lip seals or elastic expansion rings, and the outer diameter of the sealing element is interference-fitted with the inner diameter of the pipe to be welded.

4. The quick-assembly and disassembly argon-filling fixture for pipe welding according to claim 1, characterized in that: The exhaust port is equipped with a one-way valve, which allows the gas in the argon-filled space to be discharged and prevents outside air from entering.

5. The quick-assembly and disassembly argon-filling fixture for pipe welding according to claim 1, characterized in that: The outer walls of the first sleeve (201) and the second sleeve (301) are provided with radially protruding elastic positioning elements for fixing the sealing assembly inside the pipe to be welded.

6. The quick-assembly and disassembly pipe welding argon purging fixture according to claim 1, characterized in that: The two ends of the connector (100) are detachably connected to the first sleeve (201) and the second sleeve (301) respectively, and the connection part is provided with a sealing gasket.

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