Gas recycling device and method for argon arc welding of high-voltage cable

Abstract

The invention relates to the field of high-voltage cable metal aluminum sheath processing, in particular to a gas recycling device and method for argon arc welding of a high-voltage cable. The gas recycling device for argon arc welding of the high-voltage cable comprises an explosion-proof type recycling gas pump, a first sealing pipeline and a second sealing pipeline, an inlet of the high-precision gas filtering device is connected with an outlet of the explosion-proof recovery gas pump, and the high-precision gas filtering device is used for removing welding slag and oil dirt impurities in the recovered gas; an inlet of the buffer gas storage tank is connected with an outlet of the high-precision gas filtering device through a second sealing pipeline, and the buffer gas storage tank is used for storing the purified gas. By innovatively designing the helium recovery and circulation system, efficient recovery, purification, storage and reuse of residual helium are achieved, helium consumption and production cost are remarkably reduced, production interruption caused by frequent bottle replacement is reduced, and meanwhile the stability of welding quality is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of high-voltage cable aluminum sheath processing, and in particular to a gas recycling device and method for high-voltage cable argon arc welding. Background Technology

[0002] Argon arc welding machines are core equipment in the production of aluminum sheaths for high-voltage cables. During the welding process, helium is used as a protective gas, filled between the electrode needle and the aluminum strip workpiece to ensure smooth arc initiation and prevent rapid cooling and oxidation of the workpiece after welding, thus ensuring the sealing and mechanical properties of the weld joint. Helium is typically stored in 40L dedicated cylinders, and the welding process has extremely high requirements for helium concentration and flow rate stability. If the flow rate fluctuates or decreases, the helium cylinder must be replaced immediately to avoid quality defects such as oxidation of the aluminum strip or incomplete penetration.

[0003] However, the empty cylinders still retain 5%-10% helium. This portion of gas, due to insufficient pressure, cannot meet the welding process requirements, and there is a lack of suitable recycling methods for the workshop production environment; therefore, it must be returned directly to the supplier. Helium, as a rare and non-renewable gas, has a high market price, and the waste of a large amount of surplus gas leads to high production costs for enterprises. Furthermore, frequent cylinder changes involve short-term line interruptions, affecting production continuity and failing to meet the management requirements of lean manufacturing and energy conservation and emission reduction. Currently, there is no efficient recycling solution for this type of small-batch, frequent surplus helium, becoming a key pain point restricting cost reduction and efficiency improvement in the workshop.

[0004] Therefore, those skilled in the art are dedicated to developing a gas recycling device and method for high-voltage cable argon arc welding that is simple to operate, low in cost, effective, and highly adaptable. Summary of the Invention

[0005] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a gas recycling device and method for high-voltage cable argon arc welding.

[0006] To achieve the above objectives, the present invention provides a gas recycling device for high-voltage cable argon arc welding, comprising: an explosion-proof recovery gas pump, the inlet of which is connected to a gas cylinder to be recycled through a first sealed pipe for extracting residual gas in the cylinder; a high-precision gas filter, the inlet of which is connected to the outlet of the explosion-proof recovery gas pump for removing welding slag and oil impurities from the recycled gas; and a buffer gas storage tank, the inlet of which is connected to the outlet of the high-precision gas filter through a second sealed pipe for storing purified gas.

[0007] Preferably, both the gas cylinder to be recycled and the buffer gas storage tank are equipped with pressure gauges.

[0008] Preferably, the first sealing conduit is connected to the gas cylinder to be recycled via a quick-sealing connector.

[0009] Preferably, a first gas flow meter is installed on the first sealed pipe.

[0010] Preferably, a first shut-off valve is provided on the second sealing pipe.

[0011] Preferably, it also includes a welding machine, which is connected to a new gas cylinder via a main gas supply pipeline;

[0012] Preferably, a mixing pipe is connected to the main gas supply pipe, and the inlet of the mixing pipe is connected to the outlet of the buffer gas storage tank.

[0013] Preferably, the mixing pipeline is provided with a second shut-off valve, a second gas flow meter and a one-way valve in sequence along the gas flow direction.

[0014] The present invention also provides a method for recycling gas for high-voltage cable argon arc welding using any of the above-described gas recycling devices, comprising the following steps:

[0015] S1. Connect the gas cylinder to be recycled to the explosion-proof gas recycling pump through the first sealed pipe;

[0016] S2. Start the explosion-proof recovery gas pump to extract the remaining helium gas in the gas cylinder to be recovered;

[0017] S3. Pass the extracted helium gas through the high-precision gas filtration device to remove welding slag and oil impurities contained therein;

[0018] S4. Fill the buffer storage tank with purified helium and maintain the pressure inside the tank at 3MPa-5MPa.

[0019] S5. When performing argon arc welding, the helium stored in the buffer gas tank is transported to the main gas supply pipeline through the mixing pipeline, and mixed with the helium from the new gas cylinder before being supplied to the welding machine.

[0020] The beneficial effects of this invention are: by innovatively designing a helium recovery and recycling system, this invention achieves efficient recovery, purification, storage and reuse of surplus helium, significantly reducing helium consumption and production costs, reducing production interruptions caused by frequent bottle changes, and ensuring the stability of welding quality. Moreover, the method is simple, low-cost, and highly adaptable, and can effectively meet the actual needs of multiple production lines in high-pressure workshops. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the operation process of a specific embodiment of the present invention.

[0023] 11. Gas cylinder to be recycled; 12. First sealed pipeline; 12a. Quick-sealing connector; 13. Explosion-proof recycled gas pump; 14. High-precision gas transfer device; 15. Second sealed pipeline; 16. Buffer gas storage tank; 17. Pressure gauge; 18. First gas flow meter; 19. First shut-off valve; 21. Welding machine; 22. Main gas supply pipeline; 23. New gas cylinder; 24. Mixing pipeline; 25. Second shut-off valve; 26. Second gas flow meter; 27. Check valve. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] like Figure 1 As shown, the present invention provides a gas recycling device for high-voltage cable argon arc welding, including an explosion-proof recovery gas pump 13. The inlet of the explosion-proof recovery gas pump 13 is connected to the gas cylinder 11 to be recycled through a first sealed pipe 12. By setting the explosion-proof recovery gas pump 13, the residual helium in different gas cylinders can be effectively extracted, realizing the efficient recovery of low-pressure residual gas.

[0026] Meanwhile, in order to meet the actual operational needs of multiple production lines and high-frequency bottle replacement in the high-pressure workshop, a quick-sealing connector 12a is provided at the end of the first sealing pipe 12, which makes it easy for operators to quickly and reliably connect different gas cylinders 11 to be recycled, thereby significantly improving operational efficiency and ensuring the airtightness of the connection.

[0027] Furthermore, a first gas flow meter 18 is installed on the first sealed pipe 12. This first gas flow meter 18 is used to monitor the flow rate of helium gas extracted from the gas cylinder 11 to be recovered in real time. By setting the first gas flow meter 18, it is not only helpful to evaluate the amount of gas recovered in a single operation, but also to determine the state of the remaining gas in the cylinder, optimize the recovery start-stop strategy, and maximize the helium recovery rate while ensuring safety.

[0028] The outlet of the explosion-proof recovery gas pump 13 is connected to the inlet of the high-precision gas filter 14. In this embodiment, the high-precision gas filter 14 adopts a multi-stage filter element design, which can effectively intercept and remove micron-sized welding slag particles and oil aerosols and other impurities entrained in the recovery gas, ensuring that the gas purity meets the strict requirements of subsequent welding processes and avoiding adverse effects of contaminants on welding quality and equipment operation.

[0029] The purified helium gas is transported through the second sealed pipeline 15 to the buffer storage tank 16 for temporary storage. The buffer storage tank 16 serves as the temporary gas source center of the system, and its inlet is connected to the outlet of the high-precision gas filter 14. To achieve isolation of each pipeline and precise control of the flow direction of the purified gas, a first shut-off valve 19 is also installed on the second sealed pipeline 15.

[0030] To monitor the pressure status of the gas cylinder 11 to be recycled and the buffer storage tank 16 in real time, high-precision pressure gauges 17 are installed at the outlets of both. Specifically, the pressure gauge 17 on the gas cylinder 11 is used to quickly assess the pressure of the remaining gas in the cylinder before the recycling operation to determine whether it is within the recyclable range (0.5-3 MPa); while the pressure gauge 17 on the buffer storage tank 16 is used to continuously monitor the gas storage and pressure level in the buffer storage tank 16 (usually maintained at 3-5 MPa).

[0031] In addition, a welding machine 21 is also included. In this embodiment, the welding machine 21 is connected to the new gas cylinder 23 through the main gas supply pipeline 22. In order to realize the reuse of recovered helium, a mixing pipeline 24 is connected to the main gas supply pipeline 22. The inlet of the mixing pipeline 24 is connected to the outlet of the buffer gas storage tank 16, so as to merge the purified and stored recovered helium into the main gas supply flow.

[0032] Meanwhile, to ensure the controllability and safety of the mixing process, this embodiment includes a second shut-off valve 25, a second gas flow meter 26, and a one-way valve 27 sequentially arranged along the gas flow direction on the mixing pipeline 24. The second shut-off valve 25 is used to precisely control and regulate the supply and cut-off of recovered helium. The second gas flow meter 26 is used to monitor the flow rate of the incorporated recovered helium in real time, ensuring the stability of the mixed gas ratio to meet welding process requirements. The one-way valve 27 effectively prevents the high-pressure fresh helium in the main gas supply pipeline 22 from flowing back into the mixing pipeline 24 and the buffer gas storage tank 16, ensuring stable system pressure and safe operation. This integrated design achieves controllable mixing and on-demand supply of fresh and recovered helium, forming a closed-loop helium recycling system.

[0033] Similarly, the new gas cylinder 23 is also equipped with a pressure gauge 17 to monitor the gas storage and pressure level inside the cylinder in real time.

[0034] In practical application, the second shut-off valve 25 on the mixing pipeline 24 is first closed, and the remaining helium from multiple gas cylinders 11 to be recovered is collected into the buffer storage tank 16, and the gas pressure in the buffer storage tank 16 is stabilized at 3-5 MPa. After entering the welding stage, the first shut-off valve 19 on the second sealing pipeline 15 is closed, and the second shut-off valve 25 is opened. By adjusting its opening degree, the output flow rate of the recovered helium is controlled, so that it is mixed with the helium supplied from the new cylinder in an appropriate ratio, thereby forming a continuous and stable mixed gas source to be delivered to the welding machine 21, thus ensuring the normal operation of the welding process.

[0035] like Figure 2 As shown, the present invention also provides a method for recycling gas used in high-voltage cable argon arc welding. This method is based on any of the aforementioned high-voltage cable argon arc welding gas recycling devices and specifically includes the following steps:

[0036] S1. The gas cylinder 11 to be recycled is connected to the explosion-proof recycling gas pump 13 through the first sealed pipe 12. Specifically, the quick-sealing connector 12a at the end of the first sealed pipe 12 is used to achieve a quick and sealed connection with each gas cylinder 11 to be recycled.

[0037] S2. Start the explosion-proof recovery gas pump 13 to extract the remaining helium gas in the gas cylinder 11 to be recovered. During the extraction process, the pressure inside the cylinder is monitored in real time by the pressure gauge 17 set on the gas cylinder to be recovered, and the start and stop times of gas recovery are determined based on the pressure inside the cylinder.

[0038] S3. Pass the extracted helium gas through a high-precision gas filter 14 to remove impurities such as welding slag and oil, ensuring that the gas purity meets the welding process requirements.

[0039] S4. Fill the purified helium gas into the buffer storage tank 16 and maintain the pressure inside the tank within the set range of 3MPa-5MPa.

[0040] S5. When welding is performed, the helium stored in the buffer gas tank 16 is transported to the main gas supply pipeline 22 through the mixing pipeline 24, and mixed with the helium from the new gas cylinder 23, and then supplied to the welding machine 21.

[0041] This application achieves efficient recovery, purification, storage and reuse of surplus helium through the innovative design of a helium recovery and circulation system. This significantly reduces helium consumption and production costs, minimizes production interruptions caused by frequent bottle changes, and ensures the stability of welding quality. The method is simple, low-cost, and highly adaptable, effectively meeting the actual needs of multiple production lines in high-pressure workshops.

[0042] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A gas recycling device for high-voltage cable argon arc welding, characterized in that, include: An explosion-proof recovery gas pump (13) has its inlet connected to the gas cylinder (11) to be recovered through a first sealed pipe (12) for extracting the remaining gas in the cylinder; A high-precision gas filtration device (14) is connected at its inlet to the outlet of the explosion-proof recovery gas pump (13) to remove welding slag and oil impurities from the recovery gas. The buffer gas storage tank (16) has its inlet connected to the outlet of the high-precision gas filter device (14) via a second sealed pipe (15) for storing purified gas.

2. The gas recycling device for high-voltage cable argon arc welding as described in claim 1, characterized in that: Pressure gauges (17) are installed on both the gas cylinder to be recycled (11) and the buffer gas storage tank (16).

3. The gas recycling device for high-voltage cable argon arc welding as described in claim 1, characterized in that: The first sealed conduit (12) is connected to the gas cylinder (11) to be recycled via a quick-sealing connector (12a).

4. The gas recycling device for high-voltage cable argon arc welding as described in claim 3, characterized in that: A first gas flow meter (18) is installed on the first sealed pipe (12).

5. The gas recycling device for high-voltage cable argon arc welding as described in any one of claims 1-4, characterized in that: The second sealing pipe (15) is equipped with a first shut-off valve (19).

6. The gas recycling device for high-voltage cable argon arc welding as described in claim 5, characterized in that: It also includes a welding machine (21), which is connected to a new gas cylinder (23) via a main gas supply pipe (22); A mixing pipe (24) is connected to the main gas supply pipe (22), and the inlet of the mixing pipe (24) is connected to the outlet of the buffer gas storage tank (16).

7. The gas recycling device for high-voltage cable argon arc welding as described in claim 6, characterized in that: The mixing pipe (24) is provided with a second shut-off valve (25), a second gas flow meter (26) and a one-way valve (27) in sequence along the gas flow direction.

8. A method for recycling gas for high-voltage cable argon arc welding using a gas recycling device as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Connect the gas cylinder (11) to be recycled to the explosion-proof recycling gas pump (13) through the first sealed pipe (12); S2. Start the explosion-proof recovery gas pump (13) to extract the remaining helium gas in the gas cylinder (11) to be recovered; S3. Pass the extracted helium gas through the high-precision gas filter (14) to remove the welding slag and oil impurities contained therein; S4. Fill the buffer storage tank (16) with purified helium and maintain the pressure inside the tank at 3MPa-5MPa. S5. When performing argon arc welding, the helium stored in the buffer gas tank (16) is transported to the main gas supply pipeline (22) through the mixing pipeline (24), and mixed with the helium from the new gas cylinder (23) and then supplied to the welding machine (21) for use.

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