Back welding seam gas protection device for connecting pipe welding

Abstract

The utility model provides a back welding seam gas protection device for connecting pipe welding, and relates to the field of welding. The welding seam gas protection device for connecting pipe back welding comprises an inflation steel pipe and an inflation hose, a connecting mechanism is arranged on the surface of the inflation steel pipe, the connecting mechanism comprises a communicating plate and a sealing plate, inflation openings are formed in the middle of the inflation steel pipe in a circumferential mode, and two sealing mechanisms are arranged on the surface of the inflation steel pipe. And the sealing mechanism comprises a fixed sleeve and a sealing rubber ring. According to the welding seam gas protection device welded on the back face of the connecting pipe, the inflation hose is fixed to the surface of the inflation steel pipe through the communicating plate, the inflation steel pipe is sealed through the sealing plate, argon waste is avoided, argon is conveyed into the inflation steel pipe through the inflation hose, and argon in the inflation steel pipe is conveyed to the middle of the fixing sleeve through the communicating opening; and then the sealing rubber ring is driven to move outwards, and the pipeline to be welded is filled with argon through the inflation inlet.

Description

Technical Field

[0001] This utility model relates to a gas protection device for weld seams, specifically a gas protection device for back weld seams in pipe welding, belonging to the field of welding technology. Background Technology

[0002] Welding, also known as fusion welding, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature, or high pressure. Modern welding uses various energy sources, including gas flames, electric arcs, lasers, electron beams, friction, and ultrasound. Potential injuries from welding include burns, electric shock, vision impairment, inhalation of toxic fumes, and excessive ultraviolet radiation.

[0003] Patent CN217071097U discloses a back-venting protective device for pipe welding, comprising a metal flexible hose; both ends of the metal flexible hose are sequentially connected to a metal circular plate and a rubber circular plate, and multiple vent holes are provided on the metal flexible hose. This utility model supplies protective gas from inside the pipe, effectively achieving all-round protection of the weld, concentrating the protective gas in the weld area; it can better protect the weld, reduce weld defects, and improve weld quality.

[0004] During pipe welding, protective gas is filled inside the pipe to reduce welding defects. Although the protective device in the aforementioned patent provides good protection, the device is difficult to install and disassemble, reducing the convenience of pipe welding. To address this issue, we provide a gas protection device for the back weld seam of pipe welding. Utility Model Content

[0005] The purpose of this invention is to provide a gas protection device for the back weld of a pipe welding process in order to solve the above-mentioned problems, thereby addressing the difficulty in installing and disassembling the protection device in the prior art.

[0006] This utility model is achieved through the following technical solution: a gas protection device for the back weld of a pipe welding process.

[0007] The device includes an inflatable steel pipe and an inflatable hose. The surface of the inflatable steel pipe is provided with a connecting mechanism, which includes a connecting plate and a sealing plate fixedly connected to the inflatable steel pipe. The middle of the inflatable steel pipe has circumferentially arranged inflation ports. The surface of the inflatable steel pipe is provided with two sets of sealing mechanisms, which include a fixing sleeve and a sealing ring. The fixing sleeve is slidably connected to the inflatable steel pipe. Both the surface of the inflatable steel pipe and the fixing sleeve have connecting ports. The inside of the inflatable steel pipe is provided with a power mechanism, which includes a sealing gasket, a first sealing ring, and a second sealing ring.

[0008] Preferably, the surface of the connecting plate is threaded with a connector, and the output end of the inflatable hose is fixedly connected to the connector. The surface of the sealing plate is provided with several vent holes. The inflatable hose is installed on the surface of the connecting plate through the connector, thereby connecting the inflatable hose with the inflatable steel pipe.

[0009] Preferably, the surface of the fixed sleeve is provided with a slot, and the surface of the inflatable steel pipe is fixedly connected with a locking block, and the slot and the locking block are engaged. By inserting the locking block into the slot, the position of the fixed sleeve is positioned, thereby aligning the communication port.

[0010] Preferably, a reinforcing plate is fixedly connected to the surface of the fixing sleeve, and the sealing ring is slidably connected to the reinforcing plate. A tension ring is fixedly connected to the surface of the sealing ring, and the tension ring is fixedly connected to the fixing sleeve. The sealing ring is fixed by the reinforcing plate. The high-pressure gas delivered through the connection port increases the internal air pressure of the reinforcing plate, causing the sealing ring to slide outward.

[0011] Preferably, a retaining ring is fixedly connected to the surface of the fixed sleeve, and a limiting rod is slidably connected inside the retaining ring. The limiting rod is slidably connected to the fixed sleeve. The retaining ring positions the limiting rod and improves the stability of the sliding of the limiting rod.

[0012] Preferably, a locking rod is fixedly connected to the surface of the limiting rod, and the locking rod is engaged with a retaining ring. The surface of the inflatable steel pipe is provided with a positioning groove for the positioning limiting rod. The locking rod is engaged with the sliding groove on the surface of the retaining ring to limit the positioning rod and improve the stability of the engagement between the limiting rod and the positioning groove.

[0013] Preferably, a connecting frame is fixedly connected to the surface of the sealing gasket, and both the first sealing ring and the second sealing ring are fixedly connected to the connecting frame. An electric push rod for controlling the movement of the sealing gasket is fixedly connected to the surface of the sealing plate. The sealing gasket, the first sealing ring and the second sealing ring are connected together through the connecting frame, thereby driving the sealing gasket, the first sealing ring and the second sealing ring to move.

[0014] This utility model provides a gas protection device for the back weld seam in pipe welding, which has the following beneficial effects:

[0015] 1. The gas protection device for the weld seam welded on the back of the connector uses a connecting plate to fix the gas-filling hose to the surface of the gas-filling steel pipe, improving the stability of the device installation. A sealing plate seals the gas-filling steel pipe to prevent argon waste. Argon is supplied to the inside of the gas-filling steel pipe through the gas-filling hose. Argon is filled into the pipe to be welded through the gas filling port to prevent oxidation on the back of the pipe and improve the stability of the pipe welding. Argon from inside the gas-filling steel pipe is delivered to the middle of the fixed sleeve through the connecting port, thereby moving the sealing ring outwards. The fixed sleeve supports and fixes the sealing ring, improving the stability and sealing of the contact between the sealing ring and the inner wall of the gas-filling steel pipe, thus preventing argon leakage and improving the stability of the pipe welding. A sealing gasket seals the vent holes on the surface of the sealing plate, improving the sealing performance during device operation. A first sealing ring seals the connecting port, controlling its opening or closing. A second sealing ring seals the gas filling port, controlling whether argon is released from the gas filling port.

[0016] 2. The weld gas protection device welded to the back of the connector uses a connector to install an inflation hose on the surface of the connecting plate, thereby connecting the inflation hose to the inflation steel pipe. Through the vent holes on the surface of the sealing plate, the air inside the inflation steel pipe is discharged to the outside, reducing the content of oxidizing gas inside the inflation steel pipe and increasing the purity of argon gas inside the inflation steel pipe. By inserting a locking block into the locking groove, the position of the fixed sleeve is positioned, thereby aligning the connecting port and facilitating the delivery of gas from the inflation steel pipe to the fixed sleeve. The sealing ring is fixed by the reinforcing plate. The high-pressure gas delivered through the connecting port increases the gas pressure inside the reinforcing plate, causing the sealing ring to slide outward, so that the outer ring of the sealing ring comes into contact with the inner wall of the pipe to be welded.

[0017] 3. The gas protection device for the weld seam welded on the back of the connector uses a tension ring to pull the sealing ring back into the reinforcing plate after the internal gas pressure decreases, improving the ease of disassembly. A retaining ring positions the limiting rod, improving its sliding stability. A retaining rod engages with a groove on the retaining ring surface to limit the limiting rod's position, improving the stability of the engagement between the limiting rod and the positioning groove. Inserting the limiting rod into the retaining rod positions the fixed sleeve, preventing it from sliding freely during operation. An electric push rod controls the movement of the sealing gasket. A connecting frame connects the sealing gasket, the first sealing ring, and the second sealing ring, thereby moving them and controlling the gas outlet position of the inflatable steel pipe, improving the stability of the device's operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the inflatable steel pipe of this utility model;

[0020] Figure 3 This is a schematic diagram of the sealing mechanism of this utility model;

[0021] Figure 4 This utility model Figure 3 Enlarged view of the structure of part A.

[0022] [Explanation of Key Component Symbols]

[0023] 1. Inflatable steel pipe; 2. Inflatable hose;

[0024] 3. Connecting mechanism; 301. Connecting plate; 302. Connector; 303. Inflation port; 304. Sealing plate;

[0025] 4. Sealing mechanism; 401. Fixing sleeve; 402. Connecting port; 403. Reinforcing plate; 404. Tension ring; 405. Sealing ring; 406. Slot; 407. Slot block; 408. Snap ring; 409. Limiting rod; 410. Positioning groove; 411. Locking rod;

[0026] 5. Power mechanism; 501. Sealing gasket; 502. First sealing ring; 503. Second sealing ring; 504. Connecting frame; 505. Electric push rod. Detailed Implementation

[0027] This utility model provides a gas protection device for the back weld seam of a pipe welding process.

[0028] Please see Figure 1 and Figure 2 The device includes an inflatable steel pipe 1 and an inflatable hose 2. The surface of the inflatable steel pipe 1 is provided with a connecting mechanism 3. The connecting mechanism 3 includes a connecting plate 301 and a sealing plate 304 that are fixedly connected to the inflatable steel pipe 1. An array of inflatable ports 303 are opened in the middle of the inflatable steel pipe 1. The inflatable hose 2 is fixed to the surface of the inflatable steel pipe 1 through the connecting plate 301 to improve the stability of the device installation. The sealing plate 304 seals the inflatable steel pipe 1 to avoid argon waste. Argon is delivered into the inflatable steel pipe 1 through the inflatable hose 2. Argon is filled into the pipe to be welded through the inflatable ports 303 to avoid oxidation on the back of the pipe and improve the stability of pipe welding.

[0029] The surface of the connecting plate 301 is threaded with a connector 302, and the output end of the inflation hose 2 is fixedly connected to the connector 302. The surface of the sealing plate 304 is provided with several ventilation holes. The inflation hose 2 is installed on the surface of the connecting plate 301 through the connector 302, thereby connecting the inflation hose 2 with the inflation steel pipe 1. The air inside the inflation steel pipe 1 is discharged to the outside through the ventilation holes on the surface of the sealing plate 304, thereby reducing the content of oxidizing gas inside the inflation steel pipe 1 and improving the purity of argon gas inside the inflation steel pipe 1.

[0030] Please see Figure 3 and Figure 4 The surface of the inflatable steel pipe 1 is provided with two sets of sealing mechanisms 4. The sealing mechanism 4 includes a fixed sleeve 401 and a sealing ring 405. The fixed sleeve 401 is slidably connected to the inflatable steel pipe 1. Both the surface of the inflatable steel pipe 1 and the fixed sleeve 401 are provided with a connecting port 402. Argon gas inside the inflatable steel pipe 1 is transported to the middle of the fixed sleeve 401 through the connecting port 402, which in turn drives the sealing ring 405 to move outward. The fixed sleeve 401 supports and fixes the sealing ring 405, improving the stability and sealing of the contact between the sealing ring 405 and the inner wall of the inflatable steel pipe 1, thereby preventing argon gas leakage and improving the stability of pipe welding.

[0031] The surface of the fixed sleeve 401 is provided with a slot 406, and the surface of the inflatable steel pipe 1 is fixedly connected with a block 407, and the slot 406 and the block 407 are engaged. By inserting the block 407 into the slot 406, the fixed sleeve 401 is positioned, thereby aligning the connecting port 402, which facilitates the inflatable steel pipe 1 to be transported into the fixed sleeve 401.

[0032] A reinforcing plate 403 is fixedly connected to the surface of the fixed sleeve 401, and a sealing ring 405 is slidably connected to the reinforcing plate 403. A tension ring 404 is fixedly connected to the surface of the sealing ring 405, and the tension ring 404 is fixedly connected to the fixed sleeve 401. The sealing ring 405 is fixed by the reinforcing plate 403. The high-pressure gas delivered by the connecting port 402 increases the internal air pressure of the reinforcing plate 403, causing the sealing ring 405 to slide outward, so that the outer ring of the sealing ring 405 abuts against the inner wall of the pipe to be welded. After the internal air pressure of the reinforcing plate 403 decreases, the tension ring 404 pulls the sealing ring 405 back into the reinforcing plate 403, improving the convenience of disassembly of the device.

[0033] When welding pipes of different diameters, the sealing mechanism 4 of the appropriate size can be replaced to seal pipes of different specifications, which improves the convenience of using the device.

[0034] A retaining ring 408 is fixedly connected to the surface of the fixed sleeve 401. A limiting rod 409 is slidably connected inside the retaining ring 408, and the limiting rod 409 is slidably connected to the fixed sleeve 401. The retaining ring 408 positions the limiting rod 409, thereby improving the stability of the sliding of the limiting rod 409.

[0035] A locking rod 411 is fixedly connected to the surface of the limiting rod 409, and the locking rod 411 is engaged with the retaining ring 408. The surface of the inflatable steel pipe 1 is provided with a positioning groove 410 for the positioning limiting rod 409. The locking rod 411 is engaged with the sliding groove on the surface of the retaining ring 408 to limit the limiting rod 409 and improve the stability of the engagement between the limiting rod 409 and the positioning groove 410. The fixed sleeve 401 is positioned by inserting the limiting rod 409 into the fixed sleeve 409 to prevent the fixed sleeve 401 from sliding randomly during the operation of the device.

[0036] Please refer to it again. Figure 2 The gas-filled steel pipe 1 is equipped with a power mechanism 5. The power mechanism 5 includes a sealing gasket 501, a first sealing ring 502, and a second sealing ring 503. The sealing gasket 501 seals the vent holes on the surface of the sealing plate 304 to improve the sealing performance of the device during operation. The first sealing ring 502 seals the connecting port 402, thereby controlling whether the connecting port 402 is closed or opened. The second sealing ring 503 seals the gas filling port 303, thereby controlling whether the gas filling port 303 releases argon gas.

[0037] A connecting frame 504 is fixedly connected to the surface of the sealing gasket 501, and the first sealing ring 502 and the second sealing ring 503 are both fixedly connected to the connecting frame 504. An electric push rod 505 for controlling the movement of the sealing gasket 501 is fixedly connected to the surface of the sealing plate 304. The electric push rod 505 controls the movement of the sealing gasket 501. The connecting frame 504 connects the sealing gasket 501, the first sealing ring 502 and the second sealing ring 503 together, thereby driving the sealing gasket 501, the first sealing ring 502 and the second sealing ring 503 to move, controlling the air outlet position of the air-filling steel pipe 1, and improving the stability of the device operation.

[0038] The electric linear actuator 505 is existing technology, and its detailed parameters and model will not be described in detail in this application.

[0039] In use, the device is first placed at the pipe to be welded. The electric push rod 505 controls the movement of the sealing gasket 501, the first sealing ring 502, and the second sealing ring 503, moving the sealing gasket 501 away from the vent hole of the sealing plate 304, the first sealing ring 502 away from the connecting port 402, and the second sealing ring 503 sealing the inflation port 303. Argon gas is then filled into the inflation steel pipe 1 through the inflation hose 2. The gas inside the inflation steel pipe 1 flows outward through the vent hole and the connecting port 402, increasing the purity of the argon gas inside the inflation steel pipe 1. Due to the small size of the vent hole and the excessive gas delivery speed of the inflation hose 2, the internal pressure of the inflation steel pipe 1 is high. Through the connecting port 402, the high-pressure air flows into the reinforcing plate 403, driving the sealing... The sealing ring 405 moves outward, causing its outer ring to contact the inner wall of the pipe to be welded, thus sealing the weld joint. After sealing, the electric push rod 505 controls the movement of the sealing gasket 501, the first sealing ring 502, and the second sealing ring 503 to seal the vent and the connecting port 402, and controls the opening of the inflation port 303 to fill the pipe to be welded with argon gas. After welding, the inflation hose 2 is closed, and the electric push rod 505 controls the movement of the sealing gasket 501, the first sealing ring 502, and the second sealing ring 503 to open the vent and the connecting port 402, facilitating the flow of high-pressure air from inside the device and moving the sealing ring 405 away from the inner wall of the pipe, reducing the difficulty of disassembling the device and improving the convenience of pipe welding.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A back weld gas shield for pipe welding, comprising an inflatable steel tube (1) and an inflatable hose (2), characterized in that: The surface of the inflatable steel pipe (1) is provided with a connecting mechanism (3), the connecting mechanism (3) comprises a communication plate (301) and a sealing plate (304) fixedly connected with the inflatable steel pipe (1), the middle part of the inflatable steel pipe (1) is provided with a circumferentially arranged inflation port (303), the surface of the inflatable steel pipe (1) is provided with two groups of sealing mechanisms (4), the sealing mechanism (4) comprises a fixed sleeve (401) and a sealing rubber ring (405), and the fixed sleeve (401) is in sliding connection with the inflatable steel pipe (1), the surface of the inflatable steel pipe (1) and the fixed sleeve (401) is provided with a communication port (402), the inside of the inflatable steel pipe (1) is provided with a power mechanism (5), the power mechanism (5) comprises a sealing gasket (501), a first sealing ring (502) and a second sealing ring (503).

2. A back weld gas shield for pipe welding according to claim 1, characterised in that: The surface of the communication plate (301) is threadedly connected with a connecting head (302), and the output end of the inflatable hose (2) is fixedly communicated with the connecting head (302), the surface of the sealing plate (304) is provided with a plurality of air holes.

3. A back weld gas shield for pipe welding as defined in claim 1 wherein: The surface of the fixed sleeve (401) is provided with a clamping groove (406), the surface of the inflatable steel pipe (1) is fixedly connected with a clamping block (407), and the clamping groove (406) is clamped with the clamping block (407).

4. A back weld gas shield for pipe welding as defined in claim 1 wherein: The surface of the fixed sleeve (401) is fixedly communicated with a reinforcing plate (403), and the sealing rubber ring (405) is in sliding connection with the reinforcing plate (403), the surface of the sealing rubber ring (405) is fixedly connected with a tension ring (404), and the tension ring (404) is fixedly connected with the fixed sleeve (401).

5. A back weld gas shield for pipe welding as defined in claim 1 wherein: The surface of the fixed sleeve (401) is fixedly connected with a clamping ring (408), the inside of the clamping ring (408) is in sliding connection with a limiting rod (409), and the limiting rod (409) is in sliding connection with the fixed sleeve (401).

6. A back weld gas shield for pipe welding according to claim 5, wherein: The surface of the limiting rod (409) is fixedly connected with a clamping rod (411), and the clamping rod (411) is clamped with the clamping ring (408), the surface of the inflatable steel pipe (1) is provided with a positioning groove (410) for positioning the limiting rod (409).

7. A back weld gas shield for pipe welding as defined in claim 1 wherein: The surface of the sealing gasket (501) is fixedly connected with a connecting frame (504), and the first sealing ring (502) and the second sealing ring (503) are fixedly connected with the connecting frame (504), the surface of the sealing plate (304) is fixedly connected with an electric push rod (505) for controlling the movement of the sealing gasket (501).

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