A welding device for copper-nickel alloy pipe fitting overlay welding and a welding method thereof

Abstract

This invention relates to the field of surfacing equipment technology, and discloses a welding device and method for surfacing copper-nickel alloy pipe fittings. The welding device includes a positioner with an electric slider. A welding torch is mounted at the bottom of the electric slider, and a flux container for storing flux is located at the bottom of the electric slider. The flux container has a discharge port at its bottom. A flat plate is mounted at the bottom of the electric slider, and rolling wheels are mounted at the bottom of the flat plate, making rolling contact with the alloy pipe. A guide rod is mounted at the bottom of the flat plate, and a first slider is slidably mounted on the guide rod. An L-shaped rod is mounted on the side of the first slider, and a vertical rod is mounted in the middle of the L-shaped rod. The first slider drives the vertical rod to move up and down reciprocally via the L-shaped rod, displacing the flux in the discharge port, preventing flux blockage, ensuring more uniform flux discharge, and allowing the flux to fully cover the welding wire, preventing the welding wire from contacting air, ensuring a smooth weld, and improving the reliability of the device.

Description

Technical Field

[0001] This invention relates to the field of surfacing equipment technology, specifically to a welding apparatus and welding method for surfacing copper-nickel alloy pipe fittings. Background Technology

[0002] Hardfacing is a process in which a welding layer with specific properties is formed on the surface of a workpiece by depositing welding materials. Its main purpose is to improve the wear resistance, corrosion resistance, heat resistance, and other properties of the workpiece, or to repair worn or damaged workpiece surfaces. Submerged arc welding has the advantage of high efficiency and is suitable for large-area hardfacing. When using submerged arc welding, flux should be covered on the welding wire to protect the weld.

[0003] Existing surfacing equipment requires multiple welding passes during the surfacing process. To reduce the frequency of flux replenishment, a sufficient amount of flux is often stored in the flux hopper. However, due to the large amount of flux stored, leakage from the hopper can cause blockage at the outlet, resulting in uneven flux distribution. This exposes some welding wire to air during welding, leading to oxidation and an uneven weld. Therefore, this equipment does not meet the current requirements. To address this issue, we propose a welding device and method for surfacing copper-nickel alloy pipe fittings. Summary of the Invention

[0004] This invention provides a welding device and method for surfacing copper-nickel alloy pipe fittings. During welding, a vertical rod is repeatedly inserted and reciprocated through the discharge port to prevent flux leakage from the hopper from clogging the discharge port. This ensures more uniform flux distribution and guarantees that the welding wire is fully covered by flux during welding, resulting in a smooth weld. This invention solves the problem mentioned in the background art where multiple welding passes are required during surfacing. To reduce the frequency of flux replenishment, a sufficient amount of flux is often stored in the flux hopper. However, due to excessive flux storage, leakage from the hopper can clog the discharge port, leading to uneven flux distribution and causing some welding wire to be exposed to air during welding, resulting in an uneven weld due to oxidation.

[0005] This invention provides the following technical solution: a welding device and welding method for surfacing copper-nickel alloy pipe fittings, comprising a positioner, an electric slider on the positioner, a welding gun at the bottom of the electric slider, a flux tank for storing flux at the bottom of the electric slider, a discharge port at the bottom of the flux tank, a plate mounted on the bottom of the electric slider, a rolling wheel at the bottom of the plate, the rolling wheel in rolling contact with the alloy pipe, a guide rod mounted on the bottom of the plate, a first slider slidably mounted on the guide rod, an L-shaped rod mounted on the side of the first slider, a vertical rod mounted in the middle of the L-shaped rod, and the vertical rod being located directly above the discharge port;

[0006] The first slider is connected to the rolling wheel via a transmission. During welding, the vertical rod reciprocates through the discharge port.

[0007] As an optional embodiment of the welding device and welding method for surfacing copper-nickel alloy pipe fittings according to the present invention, wherein: a first roller is installed on the side of the rolling wheel, a second roller is installed on the bottom of the plate, both the first roller and the second roller are configured as rollers with grooves, and belts are installed in the grooves of the first roller and the second roller, a rocker arm is installed on the side of the second roller, and a swing rod is hinged to the other end of the rocker arm, and the swing rod is hinged to the first slider.

[0008] As an optional embodiment of the welding device and welding method for surfacing copper-nickel alloy pipe fittings according to the present invention, wherein: an L-shaped plate is provided at the bottom of the flat plate, a pressure rod is slidably installed on the L-shaped plate, a rolling wheel is rotatably installed at the bottom end of the pressure rod, a first tension spring is sleeved on the pressure rod, and the other end of the first tension spring is fixedly connected to the L-shaped plate;

[0009] A lifting rod is installed at the top of the pressure rod, and a guide plate is provided on the side of the positioner. The guide plate is configured as a trapezoidal plate.

[0010] As an optional embodiment of the welding device and welding method for surfacing copper-nickel alloy pipe fittings according to the present invention, wherein: a fixing plate is installed at the bottom end of the vertical rod, a lever plate is hinged to the bottom end of the fixing plate, a first torsion spring is provided at one end of the lever plate, the other end of the first torsion spring is fixedly connected to the fixing plate, a pull rope is installed at the bottom end of the lever plate, and the pull rope is drivenly connected to the L-shaped rod.

[0011] As an optional embodiment of the welding device and welding method for surfacing copper-nickel alloy pipe fittings according to the present invention, wherein: an active rack is provided on the L-shaped rod, a first vertical plate is installed at the bottom of the flat plate, a rotating shaft is rotatably installed on the side of the first vertical plate, an active gear for meshing with the active rack is provided on the rotating shaft, a transmission gear is installed on the side of the active gear, and a driven gear for meshing with the transmission gear is rotatably installed on the first vertical plate;

[0012] The bottom of the flat plate is provided with a sliding groove, in which a second slider is slidably installed. A driven rack is installed at the bottom end of the second slider, and the driven rack meshes with the driven gear. The second slider is fixedly connected to the pull rope.

[0013] As an optional embodiment of the welding device and welding method for surfacing copper-nickel alloy pipe fittings according to the present invention, wherein: a striking mechanism is provided at the bottom of the plate, the striking mechanism includes a fixed shaft, the fixed shaft is fixedly installed at the bottom of the plate, a rotating plate is hinged on the fixed shaft, a plurality of striking rods are provided at the bottom of the rotating plate, a second torsion spring is provided on the rotating plate, the other end of the second torsion spring is fixedly connected to the fixed shaft, and the rotating plate is drivenly connected to the second roller.

[0014] As an optional embodiment of the welding device and welding method for surfacing copper-nickel alloy pipe fittings according to the present invention, wherein: a second vertical plate is installed at the bottom of the flat plate, a rotating rod is rotatably installed on the second vertical plate, a second roller is installed on the rotating rod, a rotating sleeve is installed on the side of the second vertical plate near the second roller, a plurality of abutting rods are provided on the rotating sleeve, the abutting rods abut against the rotating plate, and a connecting sleeve is rotatably installed on the side of the second roller away from the rotating sleeve, the connecting sleeve being fixedly connected to the rocker arm;

[0015] The rotating sleeve is equipped with a first ratchet, the connecting sleeve is equipped with a second ratchet, the rotating rod is hinged with a first pawl for engaging with the first ratchet, and the rotating rod is hinged with a second pawl for engaging with the second ratchet.

[0016] As an optional embodiment of the welding device and welding method for surfacing copper-nickel alloy pipe fittings according to the present invention, wherein: a first airbag is installed on the side of the L-shaped plate, a second airbag is provided on the side of the push plate, a hose is connected between the second airbag and the first airbag, a pressure plate is installed at one end of the first airbag, and a crossbar is installed on the pressure plate.

[0017] A mainspring is mounted on the rotating shaft, with one end of the mainspring connected to the rotating shaft and the other end connected to the drive gear.

[0018] As an optional embodiment of the welding device and welding method for surfacing copper-nickel alloy pipe fittings according to the present invention, wherein: a sleeve is installed on the electric slider, a wedge-shaped strip is slidably installed in the sleeve, the inclined surface of the wedge-shaped strip abuts against the pressure plate, a compression spring is provided inside the sleeve, and the other end of the compression spring abuts against the wedge-shaped strip;

[0019] An unlocking rod is slidably mounted on the electric slider. A wedge block is mounted on one end of the unlocking rod. A wedge groove is formed on the wedge bar, and the wedge groove is correspondingly set with the wedge block. A second tension spring is sleeved on the unlocking rod, and the other end of the second tension spring is fixedly connected to the electric slider.

[0020] This solution also proposes a welding method for surfacing copper-nickel alloy pipe fittings, including the following specific steps:

[0021] S1. Preparation before welding: Install the alloy pipe on the positioner, ensure that the welding equipment is working properly, clean the area to be welded, and remove oil and rust.

[0022] S2. Overlay welding operation: Multi-layer and multi-pass welding is adopted, with the thickness of each layer controlled at 2-4mm. Vertical rods are continuously passed through the discharge port to prevent the discharge port from being blocked. After each layer is welded, the discharge port is sealed and the welding slag and spatter are cleaned.

[0023] S3. Post-weld treatment: After welding, keep the weld warm for a period of time, then cool it slowly to reduce stress. Check the weld surface for cracks and pores, and grind and polish the weld to ensure a smooth surface.

[0024] The present invention has the following beneficial effects:

[0025] 1. The welding device and welding method for surfacing copper-nickel alloy pipe fittings: During welding, a rolling wheel rolls along the surface of the pipe. The rolling wheel drives a rocker arm to make a circular motion through a first roller, a belt, and a second roller. At the same time, a first slider located at the other end of the rocker arm moves up and down with the rocker arm. Furthermore, the first slider drives a vertical rod to move up and down through an L-shaped rod, which pushes out the flux in the outlet, preventing the flux from clogging the outlet. This makes the flux discharge from the outlet more uniform, and the flux can fully cover the welding wire, preventing the welding wire from contacting the air, ensuring a smooth weld, and improving the reliability of the device.

[0026] 2. The welding device and welding method for surfacing copper-nickel alloy pipe fittings include a deflector plate at the bottom of the vertical rod. When the vertical rod moves downward, the deflector plate displaces the flux in the outlet. When the vertical rod moves upward, the driving rack meshes with the driving gear, causing the driving gear to rotate. This rotation, in turn, meshes with the driven gear, causing the driven gear to rotate. The rotation of the driven gear causes the driven rack to move along the direction of the deflector plate's rotation. When the driven rack moves the second slider, a pull rope installed on the side of the second slider pulls the deflector plate, causing it to rotate. As the deflector plate rotates, it disperses the flux gathered above the outlet, preventing it from being squeezed and accumulated laterally. This ensures smooth material flow from the outlet, making the material flow more stable and further improving the reliability of the device.

[0027] 3. The welding device and welding method for the surfacing of the copper-nickel alloy pipe fittings: After one welding pass, the rolling wheel rolls in the opposite direction along the pipe. Through the transmission of the first roller and belt, the second roller rotates in the opposite direction. At this time, the first ratchet and the first pawl inside the rotating sleeve engage, thereby causing the second roller to drive the rotating sleeve to rotate. The abutting rod set on the rotating sleeve abuts against the rotating plate. Further through the cooperation of the second torsion spring, the rotating plate swings repeatedly. At the same time, the striking rod set at the bottom of the rotating plate knocks off the flux clumps on the pipe, thereby reducing manual operation and improving the practicality of the device.

[0028] Furthermore, after one welding pass, the crossbar on the side of the first airbag comes into contact with the positioner, the first airbag contracts and discharges gas through the hose into the second airbag, and the second airbag expands to block the outlet, preventing the flux from falling out of the outlet and causing loss when removing flux clumps, thus further increasing the practicality of the device. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 This is a cross-sectional structural diagram of the flux container of the present invention.

[0031] Figure 3 This is a schematic diagram of the structure for mounting the rolling wheel of the present invention.

[0032] Figure 4 This is a schematic diagram of the mounting structure of the dial plate of the present invention.

[0033] Figure 5 This is a comparative schematic diagram showing the changes in the position of the dial plate according to the present invention.

[0034] Figure 6 This is a cross-sectional structural diagram of the rotating plate of the present invention.

[0035] Figure 7 This is a schematic cross-sectional view of the No. 2 roller of the present invention.

[0036] Figure 8 This is a schematic cross-sectional view of the wedge-shaped strip of the present invention.

[0037] Figure 9 This is a cross-sectional structural diagram of the dial plate of the present invention.

[0038] Figure 10 This is a schematic diagram of the structure of the second airbag blocking the discharge port of the present invention.

[0039] Figure 11 This is a schematic diagram of the structure of the pressure bar of the present invention.

[0040] Figure 12 For the present invention Figure 4 A magnified structural diagram of point A in the middle.

[0041] Figure 13 For the present invention Figure 5 A magnified structural diagram at point B in the middle.

[0042] In the diagram: 101, positioner; 102, electric slider; 103, flux tank; 104, discharge port; 105, welding torch; 201, plate; 202, rolling wheel; 203, roller number one; 204, belt; 205, roller number two; 206, L-shaped plate; 207, pressure rod; 208, vertical rod; 209, L-shaped rod; 210, guide plate; 211, lifting rod; 212, tension spring number one; 213, guide rod; 214, slider number one; 215, swing rod; 216, rocker arm; 217, vertical plate number two; 301, chute; 302, slider number two; 303, vertical plate number one; 304, transmission gear; 305, lever; 306, torsion spring number one; 307, fixed plate; 308, drive rack; 309 310. No. 2 airbag; 311. Pull rope; 312. Driven rack; 313. Driven gear; 314. Rotating shaft; 315. Spring; 4100. Striking mechanism; 402. Fixed shaft; 403. Rotating plate; 404. Striking rod; 405. Unlocking rod; 406. No. 2 tension spring; 407. Sleeve; 408. Wedge bar; 409. No. 1 airbag; 410. Pressure plate; 411. Crossbar; 412. Rotating sleeve; 413. Connecting sleeve; 414. Abutment rod; 415. Wedge block; 416. Hose; 417. Rotating rod; 418. No. 1 ratchet; 420. No. 2 torsion spring; 419. No. 1 pawl; 421. No. 2 ratchet; 422. No. 2 pawl; 423. Wedge groove; 425. Compression spring. Detailed Implementation

[0043] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1: This example aims to address the issue of multiple welding passes required during surfacing welding. To reduce the frequency of flux replenishment, a sufficient amount of flux is often stored in the flux hopper. However, due to excessive flux storage, leakage from the hopper can clog the outlet, leading to uneven flux distribution. This results in some welding wire being exposed to air during welding, causing oxidation and an uneven weld. Please refer to [link to relevant documentation]. Figures 1 to 13A welding device for surfacing copper-nickel alloy pipe fittings includes a positioner 101, an electric slider 102 mounted on the positioner 101, a welding gun 105 mounted at the bottom of the electric slider 102, a flux tank 103 for storing flux mounted at the bottom of the electric slider 102, a discharge port 104 mounted at the bottom of the flux tank 103, a plate 201 mounted at the bottom of the electric slider 102, a rolling wheel 202 mounted at the bottom of the plate 201, the rolling wheel 202 making rolling contact with the alloy pipe to be welded, a guide rod 213 mounted at the bottom of the plate 201, a first slider 214 slidably mounted on the guide rod 213, and an L-shaped rod 209 mounted on the side of the first slider 214. A vertical rod 208 is installed in the middle of the L-shaped rod 209. The vertical rod 208 is located directly above the discharge port 104. The first slider 214 is connected to the rolling wheel 202 for transmission. During welding, the vertical rod 208 reciprocates through the discharge port 104 to push out the flux in the discharge port 104 and prevent the flux from clogging the discharge port 104.

[0045] It should be noted that when flux is added to the surface of the alloy tube, a small amount of flux will fall off. Since the unmelted flux can be reused, in the prior art, there is a hopper for collecting flux located below the alloy tube. The fallen flux collected by the hopper can be filtered and screened before being added back to the flux bucket 103.

[0046] For details, please refer to Figure 3 A first roller 203 is installed on the side of the rolling wheel 202, and a second roller 205 is rotatably installed on the bottom of the plate 201. Both the first roller 203 and the second roller 205 are rollers with grooves, and belts 204 are installed in the grooves of the first roller 203 and the second roller 205. A rocker arm 216 is installed on the side of the second roller 205, and a swing arm 215 is hinged to the other end of the rocker arm 216. The swing arm 215 is hinged to the first slider 214.

[0047] It should be noted that as the rolling wheel 202 rolls along the surface of the alloy tube, the rolling wheel 202 drives the first roller 203 and the second roller 205 to rotate. When the second roller 205 rotates, the rocker arm 216 moves in a circular motion with the second roller 205. The swing rod 215 installed at one end of the rocker arm 216 swings back and forth with the rocker arm 216. The first slider 214 installed at the other end of the swing rod 215 moves up and down back and forth with the swing rod 215. Furthermore, the first slider 214 drives the vertical rod 208 to move up and down back and forth through the L-shaped rod 209, which dislodges the flux in the outlet 104 and prevents the flux from clogging the outlet 104.

[0048] Additionally, an L-shaped plate 206 is provided at the bottom of the flat plate 201. A pressure rod 207 is slidably mounted on the L-shaped plate 206. A rolling wheel 202 is rotatably mounted on the bottom end of the pressure rod 207. A tension spring 212 is sleeved on the pressure rod 207, and the other end of the tension spring 212 is fixedly connected to the L-shaped plate 206. Please refer to [reference needed]. Figure 11 A lifting rod 211 is installed at the top of the pressure rod 207, and a guide plate 210 is provided on the side of the positioner 101. The guide plate 210 is configured as a trapezoidal plate.

[0049] It should be noted that there is a pair of rollers 202, and the pair of rollers 202 are respectively set on both sides of the plate 201. The distance between the rollers 202 and the welding gun 105 is not less than 30cm, so as to ensure that the weld at the bottom of the rollers 202 has been completely cooled. Since the welding process requires multiple welding passes, the thickness of the metal pipe will change. The design of the first tension spring 212 can make the rollers 202 fit better with the pipe. In addition, when the welding gun 105 welds the two ends of the metal pipe, one of the rollers 202 will detach from the pipe surface and be suspended in the air. At this time, the lifting rod 211 set at the top of the pressure rod 207 will slide obliquely upward along the inclined side of the guide plate 210, thereby lifting the rollers 202. Moreover, the height of the rollers 202 is less than the groove depth of the first roller 203 (to prevent the belt 204 from detaching from the first roller 203 or the second roller 205), so that the rollers 202 will not be stuck by the edge of the pipe when they move to the pipe surface again.

[0050] This embodiment also proposes a welding method for surfacing copper-nickel alloy pipe fittings, including the following specific steps:

[0051] S1. Preparation before welding: Install the alloy tube on the positioner 101, ensure that the welding equipment such as welding machine, wire feeder, and protective gas device are working properly, clean the area to be welded, and remove oil and rust.

[0052] S2. Welding operation: Multi-layer and multi-pass welding is adopted, with the thickness of each layer controlled at 2-4mm. The vertical rod 208 is continuously passed through the discharge port 104 to prevent the discharge port 104 from being blocked. After each layer is welded, the discharge port 104 is sealed and the welding slag and spatter are cleaned.

[0053] S3. Post-weld treatment: After welding, keep the weld warm for a period of time, then cool it slowly to reduce stress. Check the weld surface for cracks and pores, and grind and polish the weld to ensure a smooth surface.

[0054] In this embodiment: During welding, the rolling wheel 202 rolls along the surface of the pipe. The rolling wheel 202 drives the rocker arm 216 to make a circular motion through the first roller 203, belt 204 and second roller 205. At this time, the first slider 214 set at the other end of the rocker arm 215 moves up and down with the rocker arm 215. Furthermore, the first slider 214 drives the vertical rod 208 to move up and down through the L-shaped rod 209, which dissipates the flux in the outlet 104, prevents the flux from clogging the outlet 104, makes the flux discharge from the outlet 104 more uniform, and the flux can fully cover the welding wire, prevent the welding wire from contacting the air, ensure the weld is smooth, and improve the reliability of the device.

[0055] Example 2 aims to address the issue of flux lateral compression and accumulation above the outlet. This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1 to 13 A fixing plate 307 is installed at the bottom of the vertical rod 208. A lever plate 305 is hinged to the bottom of the fixing plate 307. A torsion spring 306 is provided at one end of the lever plate 305. The other end of the torsion spring 306 is fixedly connected to the fixing plate 307. A pull rope 310 is installed at the bottom of the lever plate 305. The pull rope 310 is connected to the L-shaped rod 209 for transmission.

[0056] For details, please refer to Figure 4 An active rack 308 is provided on the L-shaped rod 209. A first vertical plate 303 is installed at the bottom of the flat plate 201. A rotating shaft 314 is rotatably installed on the side of the first vertical plate 303. An active gear 313 for meshing with the active rack 308 is provided on the rotating shaft 314. A transmission gear 304 is installed on the side of the active gear 313. A driven gear 312 for meshing with the transmission gear 304 is rotatably installed on the first vertical plate 303. A sliding groove 301 is provided at the bottom of the flat plate 201. A second slider 302 is slidably installed in the sliding groove 301. A driven rack 311 is installed at the bottom of the second slider 302. The driven rack 311 meshes with the driven gear 312. The second slider 302 is fixedly connected to the pull rope 310.

[0057] Specifically, when the vertical rod 208 and the L-shaped rod 209 move upward, the active rack 308 drives the active gear 313 to rotate through meshing with the active gear 313. This further drives the driven gear 312 to rotate through meshing with the transmission gear 304. The rotation of the driven gear 312 causes the driven rack 311 to move along the direction of rotation of the dial plate 305. When the driven rack 311 drives the second slider 302 to move, the pull rope 310 installed on the side of the second slider 302 pulls the dial plate 305, causing the dial plate 305 to rotate. When the dial plate 305 rotates, it will push away the flux gathered above the discharge port 104. It should be noted that when the dial plate 305 is in the discharge port 104, the pull rope 310 is in a slack state. The pull rope 310 only begins to tighten after the dial plate 305 is completely removed from the discharge port 104.

[0058] In this embodiment: a deflector plate 305 is provided at the bottom of the vertical rod 208. When the vertical rod 208 moves downward, the deflector plate 305 dislodges the flux from the discharge port 104. When the vertical rod 208 moves upward, the driving rack 308 meshes with the driving gear 313, causing the driving gear 313 to rotate. Furthermore, the driving rack 304 meshes with the driven gear 312, causing the driven gear 312 to rotate. The rotation of the driven gear 312 causes the driven rack 311 to rotate along the deflector plate 305. When the driven rack 311 moves the second slider 302, the pull rope 310 installed on the side of the second slider 302 pulls the dial plate 305, causing the dial plate 305 to rotate. When the dial plate 305 rotates, it will push away the flux gathered above the discharge port 104, preventing the flux from being squeezed and accumulated laterally above the discharge port 104. This helps to ensure smooth material discharge from the discharge port 104, making the material discharge from the discharge port 104 more stable and further improving the reliability of the device.

[0059] Example 3 aims to address the problem that during welding, flux melts and clumps, requiring manual removal of these clumps after each weld, which is labor-intensive. This example is an improvement upon Example 2. For details, please refer to [link / reference]. Figures 1 to 13 The bottom of the flat plate 201 is provided with a striking mechanism 4100. The striking mechanism 4100 includes a fixed shaft 402, which is fixedly installed on the bottom of the flat plate 201. A rotating plate 403 is hinged to the fixed shaft 402. Multiple striking rods 404 are provided at the bottom of the rotating plate 403. A second torsion spring 420 is provided on the rotating plate 403. The other end of the second torsion spring 420 is fixedly connected to the fixed shaft 402. The rotating plate 403 is connected to the second roller 205 for transmission.

[0060] It should be noted that in this embodiment, when the electric slider 102 moves from one end of the pipe to the other end, the welding process is completed once. At this time, the electric slider 102 stops moving and waits for the weld to cool completely. After the weld has cooled, the electric slider 102 moves in the opposite direction, the positioner 101 drives the pipe to rotate in the opposite direction, the rotating plate 403 swings back and forth, and the striking rod 404 set on the rotating plate 403 knocks off the agglomerated flux, thereby facilitating the next welding.

[0061] For details, please refer to Figure 7 A second vertical plate 217 is installed at the bottom of the flat plate 201. A rotating rod 417 is rotatably mounted on the second vertical plate 217. A second roller 205 is mounted on the rotating rod 417. A rotating sleeve 412 is installed on the side of the second vertical plate 217 near the second roller 205. Multiple abutting rods 414 are provided on the rotating sleeve 412, and the abutting rods 414 abut against the rotating plate 403. A connecting sleeve 413 is rotatably mounted on the side of the second roller 205 away from the rotating sleeve 412. The connecting sleeve 413 is fixedly connected to the rocker arm 216. 2. A first ratchet 418 is provided inside, and a second ratchet 421 is provided inside the connecting sleeve 413. A first pawl 419 is hinged on the rotating rod 417 for engaging with the first ratchet 418, and a second pawl 422 is hinged on the rotating rod 417 for engaging with the second ratchet 421. The first pawl 419 and the second pawl 422 can rotate in one direction through spring cooperation. Ratchet and pawl are common mechanical cooperation methods. The specific structure and principle of ratchet and pawl are well known to those skilled in the art and will not be described in detail here.

[0062] It should be noted that during welding, ratchet 421 engages with pawl 422, while ratchet 418 and pawl 419 do not engage. Therefore, roller 205 will only drive the connecting sleeve 413 to rotate, which in turn drives rocker arm 216 to rotate. When the flux clumps after welding, the rotation direction of roller 205 will be reversed as the rotation direction of roller 202 changes. At this time, ratchet 418 and pawl 419 engage, while ratchet 421 and pawl 422 do not engage. Therefore, roller 205 will only drive rotating sleeve 412 to rotate.

[0063] For details, please refer to Figure 8The L-shaped plate 206 has a first airbag 409 installed on its side, and the lever plate 305 has a second airbag 309 installed on its side. The second airbag 309 is connected to the first airbag 409 by a hose 416. A pressure plate 410 is installed at one end of the first airbag 409. A crossbar 411 is installed on the pressure plate 410. A spring 315 is installed on the rotating shaft 314. The spring 315 is a spiral spring. One end of the spring 315 is connected to the rotating shaft 314, and the other end of the spring 315 is connected to the drive gear 313. Specifically, when the drive rack 308 moves upward, the drive gear 313 rotates synchronously, and the spring 315 stores energy.

[0064] It should be noted that when the flux clumps after welding, the position of the deflector 305 is in the discharge port 104. If the deflector 305 is above the discharge port 104, the spring 315 is in an energy storage state. The spring 315 will release energy to drive the drive gear 313 to rotate in the opposite direction, causing the drive rack 308 to move downward, further driving the L-shaped rod 209 and the vertical rod 208 to move downward. The movement of the vertical rod 208 will cause the deflector 305 to return to the discharge port 104, while the movement of the L-shaped rod 209 will sequentially drive the first slider 214, the swing rod 215, and the rocker arm 216 at the bottom of the L-shaped rod 209 to rotate (see...). Figure 3 ).

[0065] As explained above, ratchet 421 and pawl 422 do not engage. Therefore, the rotation of rocker arm 216 and roller 205 will not conflict. As a result, the lever 305 will smoothly fall back into the discharge port 104. Thus, when the flux clumps after welding, the lever 305 can only be located in the discharge port 104.

[0066] Additionally, please refer to Figure 8 A sleeve 407 is installed on the electric slider 102. A wedge-shaped strip 408 is slidably installed in the sleeve 407. The inclined surface of the wedge-shaped strip 408 abuts against the pressure plate 410. A compression spring 425 is provided inside the sleeve 407. The other end of the compression spring 425 abuts against the wedge-shaped strip 408. An unlocking rod 405 is slidably installed on the electric slider 102. A wedge-shaped block 415 is installed at one end of the unlocking rod 405. A wedge-shaped groove 423 is opened on the wedge-shaped strip 408. The wedge-shaped groove 423 is correspondingly set with the wedge-shaped block 415. A second tension spring 406 is sleeved on the unlocking rod 405. The other end of the second tension spring 406 is fixedly connected to the electric slider 102.

[0067] Specifically, after one welding pass, the crossbar 411 contacts the positioner 101, compressing the first airbag 409. The gas in the first airbag 409 enters the second airbag 309 through the hose 416. The second airbag 309 expands and blocks the discharge port 104. Simultaneously, the pressure plate 410 contacts the inclined surface of the wedge strip 408, causing the wedge strip 408 to move upward. Subsequently, the pressure plate 410 disengages from the inclined surface of the wedge strip 408, and the wedge strip 408 locks the pressure plate 410, preventing the first airbag 409 from rebounding and resetting. Therefore, when the flux clumps after welding, the first airbag 409... Airbag 09 remains in a contracted state, while airbag 309 remains in an inflated state and blocks outlet 104. After the flux clumps and is knocked down, electric slider 102 returns to its initial position to await the next welding pass. At this time, unlocking rod 405, which is slidably mounted on electric slider 102, contacts positioner 101. Wedge block 415 extends into wedge groove 423, causing wedge strip 408 to move upward. Wedge strip 408 releases its restriction on pressure plate 410, airbag 409 rebounds and resets, airbag 309 contracts, and outlet 104 becomes unobstructed again to prepare for the next welding pass.

[0068] In this embodiment: After one welding pass, the rolling wheel 202 rolls in the opposite direction along the pipe. Through the transmission of the first roller 203 and the belt 204, the second roller 205 rotates in the opposite direction. At this time, the first ratchet 418 and the first pawl 419 inside the rotating sleeve 412 engage, thereby causing the second roller 205 to drive the rotating sleeve 412 to rotate. The abutting rod 414 set on the rotating sleeve 412 abuts against the rotating plate 403. Further through the cooperation of the second torsion spring 420, the rotating plate 403 swings repeatedly. At the same time, the striking rod 404 set at the bottom of the rotating plate 403 knocks off the flux clumps on the pipe, thereby reducing manual operation and improving the practicality of the device.

[0069] Furthermore, after one welding pass, the crossbar 411 on the side of the first airbag 409 comes into contact with the positioner 101. The first airbag 409 contracts and discharges gas through the hose 416 into the second airbag 309. After the second airbag 309 expands, it blocks the discharge port 104 to prevent the flux from falling out of the discharge port 104 and causing loss when removing flux clumps, thus further increasing the practicality of the device.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0071] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A welding device for surfacing copper-nickel alloy pipe fittings, comprising a positioner (101), an electric slider (102) mounted on the positioner (101), a welding torch (105) mounted at the bottom of the electric slider (102), a flux container (103) for storing flux mounted at the bottom of the electric slider (102), and a discharge port (104) mounted at the bottom of the flux container (103), characterized in that: A flat plate (201) is installed at the bottom of the electric slider (102). A rolling wheel (202) is provided at the bottom of the flat plate (201). The rolling wheel (202) rolls in contact with the alloy tube. A guide rod (213) is installed at the bottom of the flat plate (201). A first slider (214) is slidably arranged on the guide rod (213). An L-shaped rod (209) is installed on the side of the first slider (214). A vertical rod (208) is installed in the middle of the L-shaped rod (209). The vertical rod (208) is located directly above the discharge port (104). The first slider (214) is connected to the rolling wheel (202) for transmission. During welding, the vertical rod (208) reciprocates through the discharge port (104). A first roller (203) is installed on the side of the rolling wheel (202), and a second roller (205) is installed on the bottom of the plate (201). Both the first roller (203) and the second roller (205) are configured as rollers with grooves. A belt (204) is installed in the grooves of the first roller (203) and the second roller (205). A rocker arm (216) is installed on the side of the second roller (205). A swing arm (215) is hinged to the other end of the rocker arm (216). The swing arm (215) is hinged to the first slider (214). A fixing plate (307) is installed at the bottom of the vertical rod (208). A lever plate (305) is hinged at the bottom of the fixing plate (307). A torsion spring (306) is provided at one end of the lever plate (305). The other end of the torsion spring (306) is fixedly connected to the fixing plate (307). A pull rope (310) is installed at the bottom of the lever plate (305). The pull rope (310) is connected to the L-shaped rod (209) for transmission. An active rack (308) is provided on the L-shaped rod (209). A first vertical plate (303) is installed at the bottom of the flat plate (201). A rotating shaft (314) is rotatably installed on the side of the first vertical plate (303). An active gear (313) for meshing with the active rack (308) is provided on the rotating shaft (314). A transmission gear (304) is installed on the side of the active gear (313). A driven gear (312) for meshing with the transmission gear (304) is rotatably installed on the first vertical plate (303). The bottom of the plate (201) is provided with a slide groove (301), and a second slider (302) is slidably installed in the slide groove (301). A driven rack (311) is installed at the bottom of the second slider (302). The driven rack (311) meshes with the driven gear (312). The second slider (302) is fixedly connected to the pull rope (310). A striking mechanism (4100) is provided at the bottom of the plate (201). The striking mechanism (4100) includes a fixed shaft (402), which is fixedly installed at the bottom of the plate (201). A rotating plate (403) is hinged on the fixed shaft (402). Multiple striking rods (404) are provided at the bottom of the rotating plate (403). A second torsion spring (420) is provided on the rotating plate (403). The other end of the second torsion spring (420) is fixedly connected to the fixed shaft (402). The rotating plate (403) is connected to the second roller (205) in a transmission connection.

2. The welding apparatus for surfacing copper-nickel alloy pipe fittings according to claim 1, characterized in that: An L-shaped plate (206) is provided at the bottom of the flat plate (201). A pressure rod (207) is slidably installed on the L-shaped plate (206). A rolling wheel (202) is rotatably installed at the bottom end of the pressure rod (207). A first tension spring (212) is sleeved on the pressure rod (207). The other end of the first tension spring (212) is fixedly connected to the L-shaped plate (206). A lifting rod (211) is installed at the top of the pressure rod (207), and a guide plate (210) is provided on the side of the positioner (101). The guide plate (210) is configured as a trapezoidal plate.

3. The welding apparatus for overlay welding of copper-nickel alloy pipe fittings according to claim 2, characterized in that: A second vertical plate (217) is installed at the bottom of the flat plate (201). A rotating rod (417) is rotatably installed on the second vertical plate (217). A second roller (205) is installed on the rotating rod (417). A rotating sleeve (412) is installed on the side of the second vertical plate (217) close to the second roller (205). Multiple abutting rods (414) are provided on the rotating sleeve (412). The abutting rods (414) abut against the rotating plate (403). A connecting sleeve (413) is rotatably installed on the side of the second roller (205) away from the rotating sleeve (412). The connecting sleeve (413) is fixedly connected to the rocker arm (216). The rotating sleeve (412) is equipped with a first ratchet (418), the connecting sleeve (413) is equipped with a second ratchet (421), the rotating rod (417) is hinged with a first pawl (419) for engaging with the first ratchet (418), and the rotating rod (417) is hinged with a second pawl (422) for engaging with the second ratchet (421).

4. The welding apparatus for surfacing copper-nickel alloy pipe fittings according to claim 3, characterized in that: A first airbag (409) is installed on the side of the L-shaped plate (206), and a second airbag (309) is installed on the side of the lever plate (305). A hose (416) is connected between the second airbag (309) and the first airbag (409). A pressure plate (410) is installed at one end of the first airbag (409), and a crossbar (411) is installed on the pressure plate (410). A spring (315) is provided on the rotating shaft (314). One end of the spring (315) is connected to the rotating shaft (314), and the other end of the spring (315) is connected to the drive gear (313).

5. The welding apparatus for surfacing copper-nickel alloy pipe fittings according to claim 4, characterized in that: A sleeve (407) is installed on the electric slider (102), and a wedge (408) is slidably installed in the sleeve (407). The inclined surface of the wedge (408) abuts against the pressure plate (410). A compression spring (425) is provided inside the sleeve (407), and the other end of the compression spring (425) abuts against the wedge (408). An unlocking rod (405) is slidably mounted on the electric slider (102). A wedge block (415) is mounted on one end of the unlocking rod (405). A wedge groove (423) is provided on the wedge bar (408). The wedge groove (423) is correspondingly set with the wedge block (415). A second tension spring (406) is sleeved on the unlocking rod (405). The other end of the second tension spring (406) is fixedly connected to the electric slider (102).

6. A welding method for surfacing copper-nickel alloy pipe fittings, comprising a welding apparatus for surfacing copper-nickel alloy pipe fittings as described in any one of claims 1-5, characterized in that, The method includes the following specific steps: S1. Preparation before welding: Install the alloy pipe on the positioner (101), ensure that the welding equipment is working properly, clean the area to be welded, and remove oil and rust. S2, Welding operation: Multi-layer and multi-pass welding is adopted, with the thickness of each layer controlled at 2-4mm. The vertical rod (208) is continuously passed through the discharge port (104) to prevent the discharge port (104) from being blocked. After each layer is welded, the discharge port (104) is sealed and the welding slag and spatter are cleaned. S3. Post-weld treatment: After welding, keep the weld warm for a period of time, then cool it slowly to reduce stress. Check the weld surface for cracks and pores, and grind and polish the weld to ensure a smooth surface.

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