A welding device for a balance cylinder and its welding process

Abstract

This invention relates to the field of welding equipment technology, specifically disclosing a balanced hydraulic cylinder welding device and its welding process, including a power supply system, a welding torch, a wire feeding system, a gas protection system, and a cooling system. The welding torch includes a torch body, a distributor, a conductive sleeve, and a nozzle. The conductive sleeve includes: a tube body with a through hole running through it from front to back, a threaded section at the end of the tube body connecting to the distributor, and multiple mounting grooves communicating with the through hole on its circumferential surface; and multiple conductive blocks, the shapes of which are adapted to the mounting grooves, allowing the conductive blocks to slide radially along the tube body and contact the welding wire. The outer side of the conductive blocks protrudes from the tube body, and pressure is continuously applied by a fastening wire to maintain close contact between the conductive blocks and the welding wire, preventing poor contact during wire wear, thereby ensuring the stability and quality of the welding process.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and specifically to a welding device for a balance cylinder and its welding process. Background Technology

[0002] Gas carbon dioxide shielded welding (referred to as MIG welding) is a highly efficient welding process with significant advantages in welding low-carbon steel and low-alloy high-strength steel, such as high welding productivity, excellent crack resistance, and strong deformation control.

[0003] Chinese patent document CN113510346B discloses a welding torch and welding method, relating to the field of welding technology. The welding torch includes: a wire guide tube through which the welding wire passes, and the welding wire is located inside the wire guide tube; a conductive nozzle connected to the wire guide tube; a shielding gas nozzle through which shielding gas is ejected; an insulator with a through hole, one end of which engages with the shielding gas nozzle; a shielding gas conduit with an opening located inside the wire guide tube, and the shielding gas conduit is connected to the wire guide tube; and a connector passing through the through hole of the insulator, located inside the shielding gas nozzle, and connected to the shielding gas conduit.

[0004] In CO2 gas shielded welding (CO2 welding), the conductive sleeve is one of the key components of the welding torch. Its wear problem does exist and directly affects the welding stability and equipment life. The welding wire passes through the inner cavity of the conductive sleeve at a constant speed, and continuous friction causes wear on the inner wall. Especially when the welding wire is not straightened or the material is mismatched, the wear rate increases significantly. After wear, the contact area between the conductive sleeve and the welding wire decreases, the resistance increases, resulting in unstable current and causing problems such as arc drift and increased spatter. Summary of the Invention

[0005] This invention provides a welding device for a balanced hydraulic cylinder, which aims to solve the problem in related technologies where the contact area between the conductive sleeve and the welding wire is reduced after the conductive sleeve wears.

[0006] A welding device for a balanced hydraulic cylinder includes a power supply system, a welding torch, a wire feeding system, a gas protection system, and a cooling system. The welding torch includes a torch body, a distributor, a conductive sleeve, and a nozzle. The conductive sleeve includes:

[0007] The pipe body has a through hole running through the front and back. The end of the pipe body is provided with a threaded section that connects to the distributor, and multiple mounting grooves that communicate with the through hole are provided on the circumferential surface.

[0008] Multiple conductive blocks are fitted with the shape of the mounting groove, allowing the conductive blocks to slide along the radial direction of the tube body and come into contact with the welding wire. The outer side of the conductive blocks protrudes from the tube body.

[0009] The energy storage ring is fitted onto the distributor and is rotatably connected to the distributor. An elastic element connects the two.

[0010] The clutch mechanism is located on the pipe body near the threaded section, and is used to make the energy storage ring rotate with the pipe body;

[0011] The docking ring and the connecting ring are connected by multiple fastening wires. A snap-fit ​​structure is provided between the docking ring and the front end of the tube body to make the two snap together. The connecting ring is coaxially and slidably mounted on the energy storage ring.

[0012] During the process of engaging the connecting ring with the front end of the pipe body, the connecting ring pushes the clutch structure to separate the energy storage ring from the pipe body.

[0013] Its effect is as follows: the clutch structure and the accumulator ring work together. During the process of screwing the tube body to install the conductive sleeve onto the distributor, the clutch structure is engaged, allowing the accumulator ring and the tube body to rotate together. This allows the tube body to accumulate force on the accumulator ring during rotation. After installation, the clutch structure switches to disengagement, allowing the accumulator ring to rotate relative to the tube body. The accumulator ring releases its elastic potential energy, causing the connecting ring to rotate relative to the mating ring. This causes the fastening wire to wrap around the tube body. As the connecting ring rotates, the fastening wire tightens, thus squeezing the conductive block and ensuring a stable contact area between the conductive block and the welding wire, avoiding poor contact. When wear occurs between the conductive block and the welding wire, the accumulator ring continuously applies torque to the connecting ring, causing the fastening wire to tighten continuously, thus always applying pressure to the conductive block. Therefore, it can compensate for wear in a timely manner during use, extending the service life of the conductive sleeve.

[0014] Preferably, the outer circumferential surface of the energy storage ring is provided with a groove that penetrates its front end face, and the inner ring of the connecting ring is provided with a protrusion that matches the groove.

[0015] Preferably, the clutch structure includes a clutch ring, which is fitted onto the end of the pipe near the threaded section and is slidably connected to the pipe. The clutch ring and the energy storage ring are provided with matching protrusions on their respective sides. The rear end of the conductive block is provided with an elastic sheet that can abut against the clutch ring. The outer diameter of the clutch ring is larger than the inner diameter of the connecting ring.

[0016] Preferably, on the forward projection surface, the protrusion on the clutch ring is located within the inner ring range of the connecting ring.

[0017] Preferably, the snap-fit ​​structure includes an abutment block disposed at the front end of the conductive block, and a limiting block disposed in the inner ring of the mating ring that can abut against the abutment block and the conductive block. When the limiting block abuts against the abutment block, the rear end of the limiting block abuts against the front end face of the conductive block.

[0018] Preferably, the conductive block consists of two conductive strips, with an elastic conductive sheet between the two conductive strips to ensure that the conductive strips are in close contact with the inner wall of the mounting groove.

[0019] Preferably, the connecting ring is electrically connected to the shunt via a power storage ring, and the fastening wire is made of conductive material. When the connecting ring is engaged with the front end of the tube, the fastening wire is wrapped around the conductive block and applies pressure to the conductive block in the direction of the tube axis.

[0020] Preferably, the outer surface of the conductive strip is an arc-shaped surface.

[0021] A welding process for a balancing hydraulic cylinder includes the following steps:

[0022] S1. The cylinder bottom and cylinder block are coaxially mounted together, forming a gap that needs to be welded between them;

[0023] S2. Use the above-mentioned welding equipment for welding. The welding current is 130-150A and the welding voltage is 19-22V.

[0024] S3. Remove slag and weld beads after welding;

[0025] S4. After welding, perform dye penetrant testing and low-temperature tempering heat treatment at 250℃ for 1-2 hours.

[0026] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0027] 1. During the tightening process, the clutch mechanism causes the accumulator ring and the tube body to rotate together, thereby accumulating force on the accumulator ring. When fully tightened, the connecting ring is pulled forward, and the fastening wire pulls the connecting ring forward, eventually locking the connecting ring and the front end of the tube body together. During this process, the clutch mechanism switches to the disengaged state, the accumulator ring releases the stored force, and drives the connecting ring to rotate relative to the tube body. The fastening wire is wrapped around the fitting, thereby squeezing the conductive block inward. The continuous pressure applied by the fastening wire maintains close contact between the conductive block and the welding wire, preventing poor contact during the wear of the welding wire, thus ensuring the stability and quality of the welding process.

[0028] 2. Using materials with high conductivity to manufacture the fastening wires and conductive blocks ensures excellent conductivity in electrical connections. The combination of the energy storage ring, connecting ring, and fastening wire effectively transmits and distributes current to the conductive blocks. This design not only optimizes the current flow path but also enhances the overall conductivity by reducing contact resistance and improving connection stability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the welding torch in this invention.

[0030] Figure 2 This is a schematic diagram of the welding torch after the nozzle is removed in this invention.

[0031] Figure 3 This is a schematic diagram of the clutch structure in this invention.

[0032] Figure 4 This is a schematic diagram of the exploded structure of the welding torch in this invention.

[0033] Figure 5 This is a schematic diagram of the conductive block in this invention.

[0034] Figure label:

[0035] 1. Gun body; 2. Diverter; 3. Conductive sleeve; 31. Tube body; 32. Conductive block; 321. Abutment block; 322. Conductive strip; 323. Elastic conductive sheet; 33. Energy storage ring; 331. Slide groove; 34. Clutch structure; 341. Clutch ring; 342. Elastic sheet; 35. Connecting ring; 351. Limiting block; 36. Connecting ring; 361. Protrusion; 37. Fastening wire; 4. Nozzle. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] A balanced hydraulic cylinder welding device includes a power supply system, a welding torch, a wire feeding system, a gas protection system, and a cooling system. During welding, the current is controlled at 130-150A and the voltage at 19-22V to ensure welding stability. The wire feeding system precisely controls the welding wire speed to ensure welding effect. The gas protection system provides a stable carbon dioxide gas flow to prevent oxidation in the welding area. The cooling system effectively reduces the temperature of the welding torch.

[0038] like Figure 1-Figure 5 As shown, the welding torch consists of a torch body 1, a distributor 2, a conductive sleeve 3, and a nozzle 4. The distributor 2 is located at the front end of the torch body 1 and has internal and external threads. An air outlet connected to the gas protection system is opened on the outer circumference of the distributor 2 in front of the external thread. The distributor 2 is electrically connected to the power supply system. The conductive sleeve 3 is connected to the internal thread of the distributor 2. The nozzle 4 is threaded to the external thread of the distributor 2, and there is an insulating layer at the connection between the two to form an open circuit. The conductive sleeve 3 is located on the axis of the nozzle 4 and there is a large gap between it and the nozzle 4. The welding wire passes through the conductive sleeve 3.

[0039] The conductive sleeve 3 includes a tube body 31, a conductive block 32, a storage ring 33, a clutch structure 34, a docking ring 35, a connecting ring 36, and a fastening thread 37. The tube body 31 has a through hole running from front to back, and four mounting grooves communicating with the through hole are formed on its circumferential surface. The end of the tube body 31 has a threaded section that engages with the internal thread of the distributor 2. The conductive block 32 is adapted to the shape of the mounting grooves and slides radially along the tube body 31. The storage ring 33 is fitted onto the distributor 2, and a sliding groove 331 penetrating its front end face is formed on the outer circumferential surface of the storage ring 33. The connecting ring 36... The inner ring is provided with a protrusion 361 that matches the slide groove 331, so that the connecting ring 36 is coaxially slidably mounted on the energy storage ring 33. The clutch structure 34 is located on the tube body 31 near the threaded section. When the clutch structure 34 is in the engaged state, it is used to make the energy storage ring 33 rotate together with the tube body 31. When the clutch structure 34 is in the disengaged state, the energy storage ring 33 can rotate relative to the tube body 31. Multiple fastening wires 37 are connected between the mating ring 35 and the connecting ring 36 (four are shown in the figure for easy understanding, but eight or more are actually used).

[0040] A snap-fit ​​structure is provided between the front end of the docking ring 35 and the tube body 31 to make them snap together. When installing the conductive sleeve 3, the threaded section of the tube body 31 passes through the docking ring 35 and the connecting ring 36, and then is screwed onto the internal thread of the distributor 2. During the screwing process, the clutch structure 34 causes the energy storage ring 33 to rotate together with the tube body 31, thereby storing energy in the energy storage ring 33. When it is fully screwed in, the docking ring 35 is pulled forward, and the fastening wire 37 pulls the docking ring 35 forward, finally snapping the docking ring 35 and the front end of the tube body 31 together. During this process, the clutch structure 34 switches to the disengaged state, the energy storage ring 33 releases the stored energy, and drives the connecting ring 36 to rotate relative to the tube body 31. The fastening wire 37 is wrapped around the tube, thereby squeezing the conductive block 32 inward, ensuring that the conductive block 32 is in continuous contact with the welding wire, and maintaining the stability and conductivity of the welding torch.

[0041] To further improve conductivity, the connecting ring 36 is electrically connected to the shunt 2 through the energy storage ring 33, and the fastening wire 37 is made of conductive material, thereby electrically connecting to the conductive block 32 through the fastening wire 37 to ensure smooth current transmission to the conductive block 32.

[0042] The outer circumference of the energy storage ring 33 is provided with a groove 331 that passes through its front end face. The inner ring of the connecting ring 36 is provided with a protrusion 361 that matches the groove 331. An elastic element (preferably a torsion spring) is connected between the inner ring of the energy storage ring 33 and the diverter 2, so as to accumulate elastic potential energy when the energy storage ring 33 rotates.

[0043] During the installation of the conductive sleeve 3, the clutch structure 34 enables the energy storage ring 33 to rotate synchronously and accumulate force when the tube body 31 is screwed in. After the tube body 31 is fully screwed into the distributor 2, the connecting ring 35 is pulled to switch the clutch structure 34 to the disengaged state. At this time, the energy storage ring 33 releases its accumulated elastic potential energy, causing the connecting ring 36 to rotate relative to the tube body 31. This rotation causes the fastening wire 37 to wrap around the tube body 31 and gradually tighten, thereby applying continuous pressure to the conductive block 32, which realizes automatic compensation. This ensures that even if wear occurs between the conductive block 32 and the welding wire, the fastening wire 37 can be tightened in time to compensate for the wear, thereby extending the service life of the conductive sleeve 3.

[0044] The clutch structure 34 includes a clutch ring 341 and an elastic plate 342. The inner hole of the clutch ring 341 is octagonal. An octagonal block that matches the inner hole of the clutch ring 341 is provided at the end of the tube body 31 near the threaded section, so that the clutch ring 341 is slidably mounted on the tube body 31. The elastic plate 342 is fixedly connected to the rear end of the conductive block 32 and can abut against the clutch ring 341. The clutch ring 341 and the energy storage ring 33 are provided with matching protrusions on their adjacent surfaces. When the clutch ring 341 and the energy storage ring 33 are in contact, the protrusions interlock to ensure that the clutch ring 341 and the energy storage ring 33 are in contact. 3. They can rotate together, so that the clutch ring 341 drives the energy storage ring 33 to rotate synchronously. The outer diameter of the clutch ring 341 is larger than the inner diameter of the connecting ring 36. On the front projection plane, the protrusion on the clutch ring 341 is located within the inner ring range of the connecting ring 36. When the docking ring 35 is pulled forward, the connecting ring 36 is pulled forward by the fastening wire 37. The connecting ring 36 and the clutch ring 341 abut against each other, so that the elastic plate 342 deforms, causing the clutch ring 341 to disengage from the energy storage ring 33. Then, the energy storage ring 33 releases its elastic potential energy, causing the connecting ring 36 to rotate relative to the clutch ring 341.

[0045] The snap-fit ​​structure includes an abutment block 321 and a limiting block 351. The abutment block 321 is located at the front end of the conductive block 32, and the limiting block 351 is fixedly connected in the inner ring of the docking ring 35. When the docking ring 35 moves forward, the limiting block 351 is restricted between the two conductive blocks 32. When the limiting block 351 moves to the position of the abutment block 321, due to the torque applied by the docking ring 35, the side of the limiting block 351 is pressed tightly against the abutment block 321, and the rear side of the limiting block 351 is in close contact with the front end of the conductive block 32, ensuring that the docking ring 35 is stably snapped with the front end of the tube body 31, and preventing the docking ring 35 from rotating together with the connecting ring 36, thereby applying tension to the fastening wire 37, so that the fastening wire 37 generates continuous pressure on the conductive block 32, ensuring that the conductive block 32 is in close contact with the welding wire and maintaining a stable conductive connection with the welding wire.

[0046] like Figure 4 and Figure 5As shown, the conductive block 32 is composed of an elastic conductive sheet 323 (preferably made of copper-based alloy or titanium alloy) and two conductive strips 322 (preferably made of chromium zirconium copper). The two conductive strips 322 are interlocked and can change the distance between them. The elastic conductive sheet 323 is disposed between the two conductive strips 322 to make the conductive strips 322 fit tightly against the inner wall of the mounting groove, thereby making the conductive strips 322 stably conductively connected to the pipe fitting. In order to ensure stable contact between the fastening wire 37 and the conductive strips 322, the outer surface of the conductive strips 322 is an arc-shaped surface.

[0047] The installation and replacement procedure for conductive sleeve 3 is as follows:

[0048] Step 1: Fit the connecting ring 36 onto the energy storage ring 33;

[0049] Step 2: Pass the fitting through the docking ring 35 and connect it with the internal thread of the distributor 2. Then, keep the front end of the gun body 1 tilted downward and screw the fitting into the internal thread of the distributor 2.

[0050] Step 3: During the twisting process, the elastic plate 342 pushes the clutch ring 341 closer to the energy storage ring 33. When the protrusion on the clutch ring 341 engages with the protrusion on the energy storage ring 33, the clutch ring 341 drives the energy storage ring 33 to rotate synchronously, accumulating elastic potential energy.

[0051] Step 4: Continue screwing until the fitting is completely secured;

[0052] Step 5: Pull the docking ring 35 forward so that the connecting ring 36 abuts against the clutch ring 341. The elastic plate 342 deforms, the clutch ring 341 disengages from the energy storage ring 33, releasing elastic potential energy and driving the connecting ring 36 to rotate.

[0053] Step 6: The limiting block 351 is pressed tightly against the abutting block 321 to ensure that the docking ring 35 is stably engaged with the front end of the tube body 31 and to prevent rotation. At the same time, the fastening wire 37 continuously applies pressure to the conductive block 32 to maintain a stable conductive connection with the welding wire.

[0054] Step 7: When replacing, rotate the docking ring 35 in the opposite direction to disengage the docking ring 35 from the conductive block 32.

[0055] Step 8: Since the conductive block 32 is always in close sliding friction with the welding wire during the welding process, the tube body 31 is replaced less frequently. When only the conductive block 32 needs to be replaced, the conductive block 32 is removed and replaced with a new conductive block 32. If the tube body 31 is severely worn, the entire tube body 31 needs to be replaced and a new conductive block 32 needs to be reinstalled to ensure conductivity and welding stability.

[0056] A welding process for a balancing hydraulic cylinder includes the following steps:

[0057] S1. The cylinder bottom and cylinder block are coaxially mounted together, forming a gap that needs to be welded between them;

[0058] S2. Aim the welding torch at the gap, then turn on the power system. The welding wire is fed out from inside the conductive sleeve 3, and at the same time, the outer end of the welding wire contacts the gap. Move the welding torch smoothly along the gap to weld the gap. The welding current is 130-150A and the welding voltage is 19-22V.

[0059] S3. Remove slag and weld beads after welding;

[0060] S4. After welding, perform dye penetrant testing and low-temperature tempering heat treatment at 250℃ for 1-2 hours.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A welding device for a balanced hydraulic cylinder, comprising a power supply system, a welding torch, a wire feeding system, a gas protection system, and a cooling system, wherein the welding torch comprises a torch body (1), a distributor (2), a conductive sleeve (3), and a nozzle (4), characterized in that, The conductive sleeve (3) includes: The tube body (31) has a through hole that runs through the front and back. The end of the tube body (31) is provided with a threaded section that connects to the distributor (2), and multiple mounting grooves that communicate with the through hole are provided on the circumferential surface. Multiple conductive blocks (32) are adapted to the shape of the mounting groove, so that the conductive blocks (32) can slide along the radial direction of the tube body (31) and come into contact with the welding wire. The outer side of the conductive blocks (32) protrudes from the tube body (31). The energy storage ring (33) is fitted on the distributor (2) and is rotatably connected to the distributor (2). An elastic element connects the two. The clutch structure (34) is located on the tube body (31) near the threaded section, and is used to make the energy storage ring (33) rotate with the tube body (31); The docking ring (35) and the connecting ring (36) are connected by multiple fastening wires (37). A snap-fit ​​structure is provided between the front end of the docking ring (35) and the tube body (31) to make the two snap-fit ​​together. The connecting ring (36) is coaxially slidably mounted on the energy storage ring (33). During the engagement process between the docking ring (35) and the front end of the tube body (31), the connecting ring (36) pushes the clutch structure (34) to separate the energy storage ring (33) from the tube body (31).

2. The welding equipment for a balanced hydraulic cylinder according to claim 1, characterized in that, The outer circumference of the energy storage ring (33) is provided with a groove (331) that runs through its front end face, and the inner ring of the connecting ring (36) is provided with a protrusion (361) that matches the groove (331).

3. The welding equipment for a balanced hydraulic cylinder according to claim 1, characterized in that, The clutch structure (34) includes a clutch ring (341), which is fitted on the end of the tube body (31) near the threaded section and is slidably connected to the tube body (31). The clutch ring (341) and the energy storage ring (33) are provided with matching protrusions on their respective sides. The rear end of the conductive block (32) is provided with an elastic sheet (342) that can abut against the clutch ring (341). The outer diameter of the clutch ring (341) is larger than the inner diameter of the connecting ring (36).

4. The welding equipment for a balanced hydraulic cylinder according to claim 3, characterized in that, On the forward projection plane, the protrusion on the clutch ring (341) is located within the inner ring range of the connecting ring (36).

5. The welding equipment for a balanced hydraulic cylinder according to claim 4, characterized in that, The snap-fit ​​structure includes an abutment block (321) disposed at the front end of the conductive block (32), and a limiting block (351) disposed in the inner ring of the mating ring (35) that can abut against the abutment block (321) and the conductive block (32). When the limiting block (351) abuts against the abutment block (321), the rear end of the limiting block (351) abuts against the front end of the conductive block (32).

6. The welding equipment for a balanced hydraulic cylinder according to claim 5, characterized in that, The conductive block (32) consists of two conductive strips (322), and an elastic conductive sheet (323) is provided between the two conductive strips (322) to make the conductive strips (322) fit tightly against the inner wall of the mounting groove.

7. The welding equipment for a balanced hydraulic cylinder according to claim 6, characterized in that, The connecting ring (36) is electrically connected to the shunt (2) through the energy storage ring (33). The fastening wire (37) is made of conductive material. When the docking ring (35) is engaged with the front end of the tube body (31), the fastening wire (37) is wrapped around the conductive block (32) and applies pressure to the conductive block (32) in the direction of the tube body (31) axis.

8. The welding equipment for a balanced hydraulic cylinder according to claim 7, characterized in that, The outer surface of the conductive strip (322) is arc-shaped.

9. A welding process for a balancing hydraulic cylinder, characterized in that: Includes the following steps: S1. The cylinder bottom and cylinder block are coaxially mounted together, forming a gap that needs to be welded between them; S2. Welding is performed using the welding equipment described in any one of claims 1-8, with a welding current of 130-150A and a welding voltage of 19-22V. S3. Remove slag and weld beads after welding; S4. After welding, perform dye penetrant testing and low-temperature tempering heat treatment at 250℃ for 1-2 hours.

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