Valve welding equipment and welding method thereof

Abstract

The invention relates to the technical field of valve machining equipment, and discloses valve welding equipment and a welding method.The valve welding equipment comprises a welding platform, a clamping tool and a welding machine located on one side of a to-be-welded part of a welding piece, and the welding machine comprises an automatic feeding unit, a laser welding head and a driving piece; the automatic feeding unit comprises a storage barrel, an end cover, a rotating assembly, a pushing assembly and a feeding assembly. By designing the storage barrel to integrate multiple storage cavities and cooperating with the rotating assembly, the pushing assembly and the feeding assembly, automatic switching when welding rods are used up is achieved, the full-automatic welding rod replacement function is achieved, manual intervention is not needed, the downtime is shortened, the welding efficiency is improved by 30% or above, accurate positioning of welding spots in the welding rod replacement process is guaranteed, and the welding quality is improved; and meanwhile, the driving part accurately controls circumferential rotation, real-time detection (automatic material changing when the remaining length is smaller than a preset value) of the automatic feeding unit is combined, it is guaranteed that the welding process is not interrupted, continuous annular welding is achieved, and the single-time welding period is shortened by about 25%.

Description

Technical Field

[0001] The present invention relates to the technical field of valve processing equipment, in particular to valve welding equipment and a welding method thereof. Background Art

[0002] Valves are control components in fluid conveying systems, performing functions such as shutoff, regulation, diversion, backflow prevention, pressure stabilization, diversion, or overflow pressure relief. They are used to control the flow of various fluids, including air, water, steam, various corrosive media, slurries, oils, liquid metals, and radioactive media. Therefore, their welding quality is particularly important during the welding and assembly process. Existing welding methods mainly include: 1) manual welding, which is slow and has poor stability when using a handheld welding torch, resulting in poor weld uniformity and difficulty ensuring weld quality. 2) automated welding using welding machines, which ensure weld uniformity but lack automatic electrode loading and require manual assistance. For example, if the electrode runs out during a circumferential seam welding operation, the welding machine must be reset and the electrode replaced to ensure safe operation. This makes it difficult to accurately position the weld point, which can easily lead to weld buildup, leaky welds, or loose welds, compromising weld quality. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide a valve welding device and a welding method thereof to solve the technical problems mentioned in the prior art.

[0004] A valve welding device includes a welding platform and a clamping fixture for fixing a weldment, wherein the clamping fixture is provided with a welding machine on one side of the weldment to be welded, and the welding machine includes an automatic feeding unit, a laser welding head provided on one side of the discharge end of the automatic feeding unit, and a driving member for driving the automatic feeding unit and the laser welding head to rotate circumferentially along the weldment to be welded, wherein the automatic feeding unit includes: A storage barrel is provided with a plurality of storage cavities in an array along its axial direction, and the storage cavities are used to store welding rods; An end cover is provided at the discharge end of the storage barrel, and a discharge port is provided on the end cover; A rotating assembly, the output end of which is connected to the storage barrel, for driving the storage barrel to rotate a preset angle to connect any one of the storage chambers with the discharge port; A pushing assembly is provided at one end of the storage barrel away from the end cover, and is used to push the welding rod stored in any one of the storage cavities out of the discharge port when the storage cavities are connected to the discharge port; The feeding assembly is arranged on one side of the discharge port of the end cover, and is used to clamp the welding rod pushed out from the discharge port and transport it along its axial direction, as well as to detect the remaining length of the welding rod in real time during the welding operation.

[0005] Optionally, a radial adjustment component is provided between the automatic loading unit and the driving member, and the adjustment direction of the radial adjustment component is perpendicular to the axis direction of the driving member during rotation, and the radial adjustment component includes: a linear displacement mechanism mounted on the output end of the driving member; A connecting plate is mounted on the output end of the linear displacement mechanism, and the end cover and the rotating assembly are mounted on the connecting plate.

[0006] Optionally, the linear displacement mechanism includes: A guide rail mounted on an output end of the driving member; a first motor mounted at one end of the guide rail; A screw rod has one end connected to the output shaft of the first motor, and the other end passes through the connecting plate and is threadedly connected thereto, and the connecting plate is slidably connected to the guide rail.

[0007] Optionally, the driving member includes: A turntable, having a mounting slot on a side thereof close to the automatic loading unit; a first gear ring, rotatably mounted in the mounting groove; a first gear meshing with the first gear ring; The second motor is mounted on an end of the turntable away from the mounting slot. The output shaft of the second motor passes through the turntable and extends into the mounting slot to be coaxially mounted with the first gear.

[0008] Optionally, the rotating assembly includes: A second gear ring is sleeved on the storage barrel; a second gear meshing with the second gear ring; A third motor is mounted on the connecting plate, and an output shaft of the third motor passes through the connecting plate and is coaxially mounted with the second gear.

[0009] Optionally, the feeding assembly includes: Several feeding mechanisms are arranged in sequence along the axis direction of the discharge port, and a guide ring is installed between two adjacent feeding mechanisms; A material detection sensor is provided at the feeding end and / or the discharging end of the feeding mechanism, and is used to detect in real time whether there is a welding rod at the part to be tested; A connecting piece is provided at the discharge end of the feeding mechanism away from the end cover. A positioning hole is provided on the connecting piece along the feeding direction of the feeding mechanism, and a mounting platform is provided on one side of the positioning hole. The mounting platform is used to install the laser welding head.

[0010] Optionally, the feeding mechanism includes: The gear box has a feeding hole at one end along the feeding direction of the welding rod; A plurality of transmission rollers are provided on the outer peripheral side of the feeding hole and are rotatably connected to the inner side wall of the gear box, wherein the rotation direction of the transmission rollers is the same as the feeding direction of the welding rod; The third gears are arranged in a one-to-one correspondence with the transmission rollers and are coaxially installed in the gear box, and two adjacent sets of the third gears are meshed with each other; A plurality of transmission rods, respectively connected to the transmission roller and the third gear located on the same axis; The fourth motor is mounted on the gear box, and its output shaft is connected to any one of the transmission rods.

[0011] Optionally, the pusher assembly includes: A push rod, one end of which is slidably mounted in the material storage cavity, and the other end of which is located on a side of the material storage barrel away from the end cover and provided with a mounting portion; A tension spring is sleeved on the push rod, and its two ends are respectively connected to the mounting portion and the opposite surfaces of the storage barrel, and is used to push the push rod toward the interior of the storage cavity, thereby pushing the welding rod stored in the storage cavity out of the discharge port.

[0012] Optionally, the clamping fixture includes a gravity-adaptive clamping mechanism and at least one set of transverse clamping mechanisms, the gravity-adaptive clamping mechanism is used to clamp the first valve group of the weldment, and the transverse clamping mechanism is used to clamp the second valve group of the weldment at the connection of the first valve group to form a portion to be welded, wherein; The gravity adaptive clamping mechanism comprises: A support seat is provided on the welding platform; a first elastic member, one end of which is mounted on the top of the support seat; A positioning column is installed at an end of the first elastic member away from the support seat, and a pressing portion is provided at an end of the positioning column close to the first elastic member; A plurality of groups of clamping members are provided on the outer peripheral side of the positioning column, and the clamping members include: A rotating plate is rotatably mounted on the support seat, wherein a top side of the rotating plate contacts the pressing portion, and a guide groove is formed on a bottom side of the rotating plate close to the pressing portion; a second elastic member, one end of which is mounted on the support seat and the other end of which is slidably mounted in the guide groove; a clamping plate, disposed on the top of the rotating plate and located on a side away from the positioning column; The transverse clamping mechanism comprises: A fixing frame, mounted on the welding platform; The linear displacement module has an output direction that is the same as the axial direction of the part to be welded. The linear displacement module is mounted on the fixing frame, and a magnetic fixing structure is provided at its output end facing the second valve group.

[0013] A valve welding method, applied to the valve welding equipment described above, comprises the following steps: Clamp the first valve group and several second valve groups of the welded parts one by one using a clamping tool to obtain several parts to be welded; Debugging the welding parameters of the welding machine at each of the parts to be welded, and configuring a preset number of welding rods to be installed one by one in the storage cavity of the storage barrel; The driving member, the automatic loading unit and the laser welding head are started synchronously; the driving member drives the automatic loading unit and the laser welding head to rotate circumferentially along the part to be welded to realize the circumferential welding operation; wherein, when the loading assembly detects that the remaining length of the welding rod in the welding operation is less than the preset length, the driving member and the laser welding head are controlled to stop the operation and the automatic loading unit is controlled to discard the currently clamped welding rod, and at the same time, the rotating assembly is controlled to drive the storage barrel to rotate the preset angle to connect any one of the storage cavities storing the welding rod with the discharge port, so that the pushing assembly pushes the welding rod stored therein from the discharge port to the loading assembly for clamping and conveying it along its axial direction; when the welding rod is conveyed to the specified position, the driving member and the laser welding head are controlled to continue the circumferential welding operation until the driving member rotates the preset angle according to the design drawing, and the driving member, the automatic loading unit and the laser welding head are controlled to end the welding operation and reset.

[0014] The beneficial effects that the present invention can produce include: 1. The valve welding equipment and welding method provided by the present invention integrate multiple storage chambers into a storage barrel, and cooperate with a rotating component, a pushing component and a loading component to realize automatic switching when the welding rod is exhausted, so that it has a fully automatic welding rod replacement function, requiring no human intervention, reducing downtime, improving welding efficiency by more than 30%, and ensuring precise positioning of weld points during welding rod replacement, thereby improving welding quality; at the same time, the driving component (using a servo motor + gear ring transmission) accurately controls the circumferential rotation, combined with real-time detection of the automatic loading unit (automatic material replacement when the remaining length is less than the preset value), ensuring uninterrupted welding process, achieving continuous circular welding, and shortening the single welding cycle by approximately 25%.

[0015] 2. This invention utilizes a radial adjustment assembly (linear displacement mechanism + connecting plate) to calibrate the radial distance between the automatic loading unit and the laser welding head in real time, achieving precise positioning of the weld spot with an error within ±0.1mm. Simultaneously, the servo motor of the driver precisely controls the rotation angle (preset according to the design drawing) to ensure a circular weld uniformity error of ≤0.5°, eliminating manual positioning deviations.

[0016] 3. The present invention realizes the rapid positioning and clamping of welded parts by designing a gravity-adaptive clamping mechanism; at the same time, through the elastic member and the arc-shaped clamping portion, it can automatically adapt to first valve groups of different weights and sizes, and the clamping force is uniform and without looseness; and the magnetic fixing structure of the horizontal clamping mechanism cooperates with the linear displacement module to ensure that the coaxiality error at the connection between the second valve group and the first valve group is less than 0.2mm, thereby reducing welding misalignment.

[0017] 4. The automatic loading unit of the present invention uses a material detection sensor to monitor the remaining length of the welding rod in real time, and links the drive component and the laser welding head to realize the "detection-stop-replacement-continued welding" closed-loop control, reducing the intensity of manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the valve welding equipment of the present invention during welding operation; Figure 2 For the present invention Figure 1 A three-dimensional diagram of the drive components, radial adjustment components and automatic loading unit; Figure 3 For the present invention Figure 1 Structural diagram of the automatic loading unit; Figure 4 For the present invention Figure 1 Schematic diagram of the partial structure of the gravity adaptive clamping mechanism; Figure 5 For the present invention Figure 3 A transverse cross-sectional view of the feeding mechanism; In the figure: 1. Welding platform, 2. Laser welding head, 3. Driving part, 31. Turntable, 311. Mounting groove, 32. First gear ring, 33. First gear, 34. Second motor, 4. Automatic feeding unit, 41. Storage barrel, 411. Storage cavity, 42. End cover, 421. Discharge port, 43. Rotating assembly, 431. Second gear ring, 432. Second gear, 433. Third motor, 44. Pushing assembly, 441. Push rod, 442. Mounting part, 443. Tension spring, 45. Feeding assembly, 451. Feeding mechanism, 4511. Gear box, 4512. Feeding hole, 4513. Transmission roller, 4514. Third gear, 4515. Transmission rod, 4516. Fourth motor, 452. Guide ring, 453. Material detection sensor, 454. Connecting piece, 455. Positioning hole, 456. Mounting table, 5. Radial adjustment assembly, 51. Linear displacement mechanism, 511. Guide rail, 512. First motor, 513. Screw rod, 52. Connecting plate, 6. Gravity adaptive clamping mechanism, 61. Support seat, 62. First elastic piece, 63. Positioning column, 64. Pressing part, 65. Rotating plate, 66. Guide groove, 67. Second elastic piece, 68. Clamping plate, 7. Horizontal clamping mechanism, 71. Fixed frame, 72. Linear displacement module, 73. Magnetic fixing structure. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1 and Figure 2As shown, the present invention provides a valve welding device, including a welding platform 1 and a clamping tool for fixing a weldment, the clamping tool is located on one side of the weldment to be welded and a welding machine is provided, the welding machine includes an automatic loading unit 4, a laser welding head 2 provided on one side of the discharge end of the automatic loading unit 4, and a driving member 3 that drives the automatic loading unit 4 and the laser welding head 2 to rotate circumferentially along the weldment to be welded, the automatic loading unit 4 includes a storage barrel 41, an end cover 42, a rotating assembly 43, a pushing assembly 44 and a loading assembly 45. Among them, the storage barrel 41 is provided with a plurality of storage cavities 411 in an array along its axial direction, and the storage cavities 411 are used to store welding rods; the end cover 42 is provided at the discharge end of the storage barrel 41, and a discharge port 421 is provided on the end cover 42; the output end of the rotating assembly 43 is connected to the storage barrel 41, and is used to drive the storage barrel 41 to rotate a preset angle to connect any one of the storage cavities 411 with the discharge port 421; the pushing assembly 44 is provided at one end of the storage barrel 41 away from the end cover 42, and the pushing assembly 44 is used to push the welding rod stored therein out of the discharge port 421 when any one of the storage cavities 411 is connected to the discharge port 421; the loading assembly 45 is provided on one side of the discharge port 421 of the end cover 42, and is used to clamp the welding rod pushed out from the discharge port 421 and convey it along its axial direction, and to detect the remaining length of the welding rod in real time during the welding operation. In this embodiment, when it is detected that the remaining length of the welding rod in the welding operation is less than the preset length, the driving member 3 and the laser welding head 2 are controlled to stop the operation and the automatic loading unit 4 is controlled to discard the currently clamped welding rod. At the same time, the rotating component 43 is controlled to drive the storage barrel 41 to rotate the preset angle to connect any one of the storage chambers 411 containing the welding rod with the discharge port 421, so that the pushing component 44 pushes the welding rod stored therein from the discharge port 421 to the loading component 45 for clamping and conveying it along its axial direction; when the welding rod is conveyed to the specified position, the driving member 3 and the laser welding head 2 are controlled to continue the circumferential welding operation until the driving member 3 rotates the preset angle according to the design drawing, and the driving member 3, the automatic loading unit 4 and the laser welding head 2 are controlled to end the welding operation and reset, thereby realizing automatic loading of welding rods in the welding operation, which helps to improve welding efficiency, and ensure the precise positioning of welding points during the replacement of welding rods, thereby improving welding quality.

[0021] Furthermore, if Figure 1 and Figure 4 As shown, the clamping tool includes a gravity-adaptive clamping mechanism 6 and at least one set of transverse clamping mechanisms 7. The gravity-adaptive clamping mechanism 6 is used to clamp the first valve group (such as the valve body) of the welded part, and the transverse clamping mechanism 7 is used to clamp the second valve group (such as the connecting flange, the valve body expansion section) of the welded part at the connection of the first valve group to form a portion to be welded.

[0022] In the above, if Figure 4As shown, the gravity adaptive clamping mechanism 6 includes a support seat 61, a first elastic member 62, a positioning column 63 and several groups of clamping members; the support seat 61 is fixedly installed in a pre-opened mounting hole on the welding platform 1 by fastening bolts to ensure installation accuracy; one end of the first elastic member 62 is fixedly installed on the top of the support seat 61; the positioning column 63 is installed on the end of the first elastic member 62 away from the support seat 61, and a pressing portion 64 is provided on the end of the positioning column 63 close to the first elastic member 62, and the pressing portion 64 is set as a conical table, and the outer peripheral surface of the conical table is set to be inclined downward; several groups of clamping members are circumferentially distributed on the outer peripheral side of the positioning column 63. The clamping member includes a rotating plate 65, a second elastic member 67 and a clamping plate 68. The rotating plate 65 is mounted on the support seat 61 by a crank rotation. One side of the top of the rotating plate 65 contacts the pressing portion 64. A guide groove 66 is provided at the bottom of the rotating plate 65 and close to the pressing portion 64. The guide groove 66 is a long hole; one end of the second elastic member 67 is fixedly mounted on the support seat 61, and the other end is slidably mounted in the guide groove 66; the clamping plate 68 is an L-shaped structure, the vertical section of which is fixedly mounted on the top of the rotating plate 65 on the side away from the positioning column 63, and the horizontal section extends toward the side close to the positioning column 63 and is hingedly mounted with a clamping portion, and the side of the clamping portion close to the column is set to be a curved surface that fits the outer wall of the first valve group.

[0023] In this embodiment, if Figure 1 As shown, when clamping the first valve assembly, the clamping portion of the first valve assembly (i.e., the valve stem connection end of the valve body) is inserted and installed on the positioning post 63, and the installation is centered by the positioning post 63. When the first valve assembly abuts against the positioning post 63, it will press the first elastic member 62 downward under its own weight to begin to shrink and deform. At the same time, the pressing portion 64 of the positioning post 63 presses the rotating plate 65 downward along its connection axis, thereby driving the clamping plate 68 to rotate toward the side closer to the positioning post 63 until it abuts the outer surface of the first valve assembly, thus completing the clamping action. The curved surface of the clamping portion can further limit the first valve assembly.

[0024] In some embodiments, the clamping portion of the clamping plate 68 can also be set as a magnet, which can ensure that the clamping plate 68 is firmly adsorbed on the outer surface of the first valve group, thereby improving the clamping effect; and a number of elastic gaskets are installed between it and the fitting surface of the first valve group, which play a protective role on the clamping surface of the first valve group without hindering the adsorption effect of the magnet, thereby avoiding pinching or scratching during the blanking process.

[0025] In this embodiment, if Figure 4As shown, both the first elastic member 62 and the second elastic member 67 are springs. In their initial state, the springs undergo no deformation or only slight deformation, and the sum of their deformation and the deformation required by the first valve assembly during the clamping process is less than the total deformation of the springs. To ensure the stability of the spring during telescopic movement and to position the mounting position of the positioning post 63, a telescopic rod is provided inside the spring. The ends of the telescopic rod extend to align with the ends of the spring and are connected to corresponding structural members. For example, the ends of the telescopic rod of the first elastic member 62 are fixedly connected to the opposing surfaces of the positioning post 63 and the support seat 61, respectively, and can be fixed using screws. One end of the telescopic rod of the second elastic member 67 is fixedly connected to the support seat 61, while the other end extends through the guide slot 66 and into the interior thereof, where a sphere (e.g., a steel ball) is mounted. The diameter of the sphere is greater than the bottom width of the guide slot 66, facilitating stable mounting within the guide slot and sliding along its longitudinal direction. Furthermore, to facilitate mounting of the sphere, a mounting opening is provided on the outer periphery of the rotating plate 65, perpendicular to the guide slot 66.

[0026] In the above, if Figure 1 As shown, the transverse clamping mechanism 7 includes a fixed frame 71 and a linear displacement module 72. The fixed frame 71 is fixedly mounted on the welding platform 1 via fastening bolts. The top of the welding platform 1 is provided with multiple sets of mounting holes arranged side by side according to the design drawings of different valves, facilitating adjustment of the installation position of the transverse clamping mechanism 7 according to the design drawings of each valve. The output direction of the linear displacement module 72 is aligned with the axial direction of the welded portion. The linear displacement module 72 is fixedly mounted on the fixed frame 71, and a magnetic fixing structure 73 (e.g., a structure with an adsorption function composed of a magnet, electromagnet, etc.) is provided at its output end facing the second valve group. The magnetic fixing structure 73 pre-fixes the second valve group, and the linear displacement module 72 then drives the second valve group to move to the connection with the first valve group for clamping and fixing. The linear displacement module 72 is preferably a pneumatic cylinder, an electric cylinder, or a hydraulic cylinder, and is selected based on the actual application scenario. In this embodiment, a pneumatic cylinder is preferably used, and is equipped with a gas supply device (e.g., a high-pressure gas tank and gas supply pipeline).

[0027] In the above, if Figure 2As shown, the driving member 3 includes a turntable 31, a first gear ring 32, a first gear 33, and a second motor 34. The turntable 31 is fixedly mounted on a fixed frame 71, and the output shaft of the linear displacement module 72 passes through the turntable 31 and is connected to the magnetic fixing structure 73. A mounting slot 311 is provided on the side of the turntable 31 near the automatic loading unit 4. The first gear ring 32 is rotatably mounted in the mounting slot 311, and the first gear 33 is meshed with the first gear ring 32. The second motor 34 is fixedly mounted on the end of the turntable 31 away from the mounting slot 311 through the frame. The output shaft of the second motor 34 passes through the turntable 31 and extends into the mounting slot 311 to be coaxially mounted with the first gear 33. In this embodiment, the second motor 34 is preferably a servo motor to facilitate precise control of the rotation angle. Specifically, when the driving member 3 is in operation, the second motor 34 is started, which in turn drives the first gear 33 to rotate the first gear ring 32, so that the first gear ring 32 drives the automatic loading unit 4 to rotate circumferentially along the part to be welded, thereby achieving the welding operation.

[0028] In the above, if Figure 2 and Figure 3 As shown, the rotating assembly 43 includes a second gear ring 431, a second gear 432, and a third motor 433. The second gear ring 431 is sleeved on the storage barrel 41; the second gear 432 is meshed with the second gear ring 431; and the third motor 433 is mounted on the connecting plate 52. The output shaft of the third motor 433 passes through the connecting plate 52 and is coaxially mounted with the second gear 432. In this embodiment, the third motor 433 is preferably a servo motor. The single rotation angle is set according to the angle between two adjacent storage chambers 411, and the number of revolutions of the second gear 432 is set according to the single rotation angle. Therefore, each time the storage barrel 41 rotates one unit amount (single rotation angle), the discharge port 421 switches to communicate with the next set of storage chambers 411, thereby achieving automatic discharge of welding rods.

[0029] In the above, if Figure 2 and Figure 3 As shown, the loading assembly 45 includes a plurality of feeding mechanisms 451, a guide ring 452, a material detection sensor 453, and a connector 454. The plurality of feeding mechanisms 451 are sequentially arranged along the axial direction of the discharge port 421, and a guide ring 452 is fixedly installed between two adjacent feeding mechanisms 451 via a connecting rod, thereby forming an observation window therebetween for the operator to check the discharge status of the material; the material detection sensor 453 (a stroke detection sensor may be used) is arranged at the feed end and / or the discharge end of the feeding mechanism 451, and is used to detect in real time whether there is a welding rod at the part to be tested; the connector 454 is arranged at the discharge end of the feeding mechanism 451 on the side away from the end cover 42, and a positioning hole 455 is opened on the connector 454 along the feeding direction of the feeding mechanism 451, and a mounting platform 456 is inclinedly arranged on one side of the positioning hole 455, and the mounting platform 456 is used to mount the laser welding head 2.

[0030] In this embodiment, if Figure 2 and Figure 3 As shown, there are two feeding mechanisms 451, which are named as the first feeding mechanism and the second feeding mechanism for easy distinction; wherein, the first feeding mechanism is installed at the discharge port 421 of the end cover 42, and the second feeding mechanism is arranged on the side close to the part to be welded, and the material detection sensor 453 is installed at the feed end of the second feeding mechanism. When it is detected that the welding rod has completely passed through the feed end of the second feeding mechanism, the rotating assembly 43 is controlled to drive the storage barrel 41 to rotate a preset angle to transport the welding rod to the first feeding mechanism for automatic loading. At this time, the driving member 3 and the laser welding head 2 are controlled to stop the welding operation, and the second feeding mechanism is controlled to discharge and discard the clamped welding rod from the discharge end until the material detection sensor 453 detects that the welding rod has penetrated the feed end of the second feeding mechanism, and calculates the feeding time of the welding rod according to the distance between the feed end of the second feeding mechanism and the part to be welded, so as to control the driving member 3 and the laser welding head 2 to perform the welding operation after at least delaying the corresponding feeding time, thereby ensuring the precise positioning of the welding point.

[0031] Specifically, such as Figure 5 As shown, the feeding mechanism 451 includes a gear box 4511, several groups of transmission rollers 4513, a third gear 4514, several transmission rods 4515 and a fourth motor 4516; wherein, one end of the gear box 4511 is provided with a feeding hole 4512 along the feeding direction of the welding rod; several groups of transmission rollers 4513 are arranged on the outer peripheral side of the feeding hole 4512 and are rotatably connected to the inner side wall of the gear box 4511, and the rotation direction of the transmission rollers 4513 is the same as the feeding direction of the welding rod; the third gear 4514 is provided with a plurality of transmission rods 4515 and a fourth motor 4516; wherein, the gear box 4511 is provided with a feeding hole 4512 at one end along the feeding direction of the welding rod; The third gears 4514 and the transmission rollers 4513 are arranged one-to-one and coaxially mounted within the gearbox 4511. Adjacent sets of third gears 4514 mesh with each other. Several transmission rods 4515 are fixedly connected to the transmission rollers 4513 and third gears 4514, respectively, which are located on the same axis. The transmission rods 4515 are rotatably connected to the gearbox 4511 via bearings. A fourth motor 4516 is fixedly mounted on the gearbox 4511, and its output shaft is connected to any one of the transmission rods 4515. When the fourth motor 4516 is in operation, it drives the transmission rods 4515 to rotate, thereby driving the third gears 4514 and transmission rollers 4513 to rotate synchronously. During rotation, the transmission rollers 4513 use friction to transport the welding rod from the feed end to the discharge end of the feeding mechanism 451. The meshing of the two adjacent sets of third gears 4514 drives the transmission rollers 4513 on both sides of the feeding hole 4512 to transport the welding rod in the same direction, ensuring the stability of the feeding mechanism 451 during welding rod transport.

[0032] In the above, if Figure 3As shown, the pushing assembly 44 includes a push rod 441 and a tension spring 443. One end of the push rod 441 is slidably installed in the storage chamber 411, and the other end is located on the side of the storage barrel 41 away from the end cover 42 and is provided with a mounting portion 442; the tension spring 443 is sleeved on the push rod 441, and its two ends are respectively connected to the opposite surfaces of the mounting portion 442 and the storage barrel 41, and is used to push the push rod 441 toward the inside of the storage chamber 411, thereby pushing the welding rod stored in the storage chamber 411 out of the discharge port 421. When the welding rod in the storage chamber 411 is used up, the push rod 441 can be pulled out of the storage chamber 411, and the welding rod can be replenished into the storage chamber 411 and then reinserted to support the welding rod; a refueling plate can also be detachably installed at the end of the storage barrel 41 away from the end cover 42, and the pushing assembly 44 can be set on the refueling plate, so that when refueling later, the welding rod can be replenished by simply removing the refueling plate, which effectively reduces labor intensity and extends the service life of the tension spring 443.

[0033] Furthermore, if Figure 2 As shown, a radial adjustment assembly 5 is provided between the automatic loading unit 4 and the driving member 3. The adjustment direction of the radial adjustment assembly 5 is perpendicular to the axis of rotation of the driving member 3. This assembly is used to adjust the distance between the automatic loading unit 4 and the laser welding head 2 and the welded portion before welding and when changing welding rods, thereby calibrating welding accuracy and facilitating solder disposal. The radial adjustment assembly 5 includes a linear displacement mechanism 51 and a connecting plate 52. The linear displacement mechanism 51 is mounted on the output end of the driving member 3. The connecting plate 52 is mounted on the output end of the linear displacement mechanism 51. The end cap 42 and the rotating assembly 43 are mounted on the connecting plate 52, providing support and fixation, thereby improving the integration of the equipment.

[0034] In the above, if Figure 2 As shown, the linear displacement mechanism 51 includes a guide rail 511, a first motor 512 and a screw rod 513; the guide rail 511 is fixedly mounted on the output end of the driving member 3, the first motor 512 is fixedly mounted on one end of the guide rail 511, and one end of the screw rod 513 is connected to the output shaft of the first motor 512, and the other end passes through the connecting plate 52 and is threadedly connected to it, and the connecting plate 52 is slidingly connected to the guide rail 511. At the same time, in order to ensure the installation strength between the connecting plate 52 and the guide rail 511, a T-shaped groove is provided on one side of the guide rail 511, and a T-shaped slider protrudes outward on the connecting plate 52. The T-shaped slider is slidably mounted in the T-shaped groove, so that when the first motor 512 drives the connecting plate 52 to move through the screw rod 513, it can play a guiding and positioning role for it, thereby improving the stability of the equipment.

[0035] The present invention also provides a valve welding method, which is applied to the above-mentioned valve welding equipment. The method includes the following steps: first, a first valve group and several second valve groups of the welding part are clamped one by one by a clamping tool to obtain several parts to be welded; then, the welding parameters of the welding machine at each part to be welded are debugged, and a preset number of welding rods are configured to be installed one by one in the storage cavity 411 of the storage barrel 41; the driving member 3, the automatic loading unit 4 and the laser welding head 2 are started synchronously; the driving member 3 drives the automatic loading unit 4 and the laser welding head 2 to rotate circumferentially along the part to be welded to realize the circumferential welding operation; wherein, the loading component 45 detects that the remaining length of the welding rod in the welding operation is less than the preset length At this time, the driving member 3 and the laser welding head 2 are controlled to stop working and the automatic loading unit 4 is controlled to discard the currently clamped welding rod. At the same time, the rotating component 43 is controlled to drive the storage barrel 41 to rotate the preset angle to connect any one of the storage chambers 411 containing the welding rod with the discharge port 421, so that the pushing component 44 pushes the welding rod stored inside from the discharge port 421 to the loading component 45 for clamping and conveying it along its axial direction; when the welding rod is conveyed to the specified position, the driving member 3 and the laser welding head 2 are controlled to continue the circumferential welding operation until the driving member 3 rotates the preset angle according to the design drawing, and the driving member 3, the automatic loading unit 4 and the laser welding head 2 are controlled to end the welding operation and reset.

[0036] In this embodiment, in order to ensure that the welding rod falls smoothly after use and to remove the welding slag remaining on the surface of the part to be welded, a blowing pipeline can be arranged on the mounting table 456. The air inlet end of the blowing pipeline is connected to the gas distribution source, and the air outlet end of the blowing pipeline is directed between the laser welding head 2 and the discharge end of the automatic feeding mechanism. During the welding operation, inert gas is blown onto the surface after welding to remove the welding slag and the residual welding rod sent from the discharge end of the feeding mechanism 451.

Claims

1. A valve welding device, comprising a welding platform (1) and a clamping tool for fixing a welded part, wherein the clamping tool is provided with a welding machine on one side of a part to be welded of the welded part, characterized in that: The welding machine comprises an automatic loading unit (4), a laser welding head (2) arranged on one side of a discharge end of the automatic loading unit (4), and a driving member (3) for driving the automatic loading unit (4) and the laser welding head (2) to rotate circumferentially along a portion of the welded part to be welded, wherein the automatic loading unit (4) comprises: A storage barrel (41) is provided with a plurality of storage cavities (411) arranged in an array along its axial direction, wherein the storage cavities (411) are used to store welding rods; An end cover (42) is provided at the discharge end of the storage barrel (41), and a discharge port (421) is provided on the end cover (42); A rotating assembly (43), the output end of which is connected to the storage barrel (41), and is used to drive the storage barrel (41) to rotate by a preset angle to connect any one of the storage chambers (411) with the discharge port (421); A pushing assembly (44) is provided at one end of the storage barrel (41) away from the end cover (42), and the pushing assembly (44) is used to push the welding rod stored in any one of the storage cavities (411) out of the discharge port (421) when the storage cavities (411) are connected to the discharge port (421); The feeding assembly (45) is provided on one side of the discharge port (421) of the end cover (42), and is used to clamp the welding rod pushed out from the discharge port (421) and convey it along its axial direction, and to detect the remaining length of the welding rod in real time during the welding operation.

2. A valve welding device according to claim 1, characterized in that: A radial adjustment component (5) is provided between the automatic loading unit (4) and the driving member (3), and the adjustment direction of the radial adjustment component (5) is perpendicular to the axis direction of the driving member (3) during rotation. The radial adjustment component (5) comprises: A linear displacement mechanism (51) is mounted on the output end of the driving member (3); A connecting plate (52) is mounted on the output end of the linear displacement mechanism (51), and the end cover (42) and the rotating assembly (43) are mounted on the connecting plate (52).

3. A valve welding device according to claim 2, characterized in that: The linear displacement mechanism (51) comprises: A guide rail (511) is mounted on the output end of the driving member (3); A first motor (512) is mounted on one end of the guide rail (511); A screw rod (513) has one end connected to the output shaft of the first motor (512), and the other end passes through the connecting plate (52) and is threadedly connected thereto, and the connecting plate (52) is slidably connected to the guide rail (511).

4. The valve welding equipment according to claim 1, characterized in that: The driving member (3) comprises: A turntable (31) having a mounting groove (311) formed on one side thereof close to the automatic loading unit (4); A first gear ring (32) is rotatably mounted in the mounting groove (311); A first gear (33) meshing with the first gear ring (32); A second motor (34) is mounted on an end of the turntable (31) away from the mounting slot (311), and an output shaft of the second motor (34) passes through the turntable (31) and extends into the mounting slot (311) to be coaxially mounted with the first gear (33).

5. The valve welding equipment according to claim 2, characterized in that: The rotating assembly (43) comprises: A second gear ring (431) is sleeved on the storage barrel (41); A second gear (432) meshing with the second gear ring (431); The third motor (433) is mounted on the connecting plate (52), and the output shaft of the third motor (433) passes through the connecting plate (52) and is coaxially mounted with the second gear (432).

6. The valve welding equipment according to claim 1, characterized in that: The feeding assembly (45) comprises: A plurality of feeding mechanisms (451) are sequentially arranged along the axial direction of the discharge port (421), and a guide ring (452) is installed between two adjacent feeding mechanisms (451); A material detection sensor (453) is provided at the feeding end and / or the discharging end of the feeding mechanism (451) and is used for detecting in real time whether there is a welding rod at the part to be tested; A connecting member (454) is provided at the discharge end of the feeding mechanism (451) away from the end cover (42), a positioning hole (455) is provided on the connecting member (454) along the feeding direction of the feeding mechanism (451), and a mounting platform (456) is provided on one side of the positioning hole (455), and the mounting platform (456) is used to mount the laser welding head (2).

7. The valve welding equipment according to claim 6, characterized in that: The feeding mechanism (451) comprises: The gear box (4511) has a feeding hole (4512) at one end along the feeding direction of the welding rod; a plurality of groups of transmission rollers (4513) disposed on the outer peripheral side of the feeding hole (4512) and rotatably connected to the inner side wall of the gear box (4511); the rotation direction of the transmission rollers (4513) is the same as the feeding direction of the welding rod; The third gears (4514) are arranged in a one-to-one correspondence with the transmission rollers (4513) and are coaxially mounted in the gear box (4511), and two adjacent sets of the third gears (4514) are meshed with each other; A plurality of transmission rods (4515) are respectively connected to the transmission roller (4513) and the third gear (4514) located on the same axis; The fourth motor (4516) is mounted on the gear box (4511), and its output shaft is connected to any one of the transmission rods (4515).

8. The valve welding equipment according to claim 1, characterized in that: The pusher assembly (44) comprises: A push rod (441), one end of which is slidably mounted in the material storage cavity (411), and the other end of which is located on a side of the material storage barrel (41) away from the end cover (42) and provided with a mounting portion (442); A tension spring (443) is sleeved on the push rod (441), and its two ends are respectively connected to the mounting portion (442) and the opposite surface of the storage barrel (41), and is used to push the push rod (441) toward the inside of the storage chamber (411), thereby pushing the welding rod stored in the storage chamber (411) out of the discharge port (421).

9. The valve welding equipment according to claim 1, characterized in that: The clamping fixture comprises a gravity-adaptive clamping mechanism (6) and at least one set of transverse clamping mechanisms (7), wherein the gravity-adaptive clamping mechanism (6) is used to clamp the first valve group of the weldment, and the transverse clamping mechanism (7) is used to clamp the second valve group of the weldment at the connection of the first valve group to form a portion to be welded, wherein; The gravity adaptive clamping mechanism (6) comprises: A support seat (61) is provided on the welding platform (1); A first elastic member (62), one end of which is mounted on the top of the support seat (61); A positioning column (63) is installed at an end of the first elastic member (62) away from the support seat (61), and a pressing portion (64) is provided at an end of the positioning column (63) close to the first elastic member (62); A plurality of groups of clamping members are provided on the outer peripheral side of the positioning column (63), and the clamping members include: A rotating plate (65) is rotatably mounted on the support seat (61), a top side of the rotating plate (65) contacts the pressing portion (64), and a guide groove (66) is provided on a bottom side of the rotating plate (65) close to the pressing portion (64); A second elastic member (67), one end of which is mounted on the support seat (61) and the other end of which is slidably mounted in the guide groove (66); A clamping plate (68) is provided on the top of the rotating plate (65) and is located on a side away from the positioning column (63); The transverse clamping mechanism (7) comprises: A fixing frame (71) is mounted on the welding platform (1); The linear displacement module (72) has an output direction that is the same as the axial direction of the portion to be welded. The linear displacement module (72) is mounted on the fixing frame (71), and a magnetic fixing structure (73) is provided at its output end facing the second valve group.

10. A valve welding method, characterized in that: Applied to the valve welding equipment according to any one of claims 1 to 9, the method comprises the following steps: Clamp the first valve group and several second valve groups of the welded parts one by one using a clamping tool to obtain several parts to be welded; Debugging the welding parameters of the welding machine at each of the parts to be welded, and configuring a preset number of welding rods to be installed one by one in the storage cavity (411) of the storage barrel (41); The driving member (3), the automatic feeding unit (4) and the laser welding head (2) are started synchronously; the driving member (3) drives the automatic feeding unit (4) and the laser welding head (2) to rotate circumferentially along the portion to be welded, thereby realizing a circumferential welding operation; wherein, when the feeding assembly (45) detects that the remaining length of the welding rod in the welding operation is less than a preset length, the driving member (3) and the laser welding head (2) are controlled to stop the operation and the automatic feeding unit (4) is controlled to discard the currently clamped welding rod, and at the same time, the rotating assembly (43) is controlled to drive the storage barrel (41) to rotate by a preset angle to remove the welding rod therein. Any one of the storage chambers (411) storing welding rods is connected to the discharge port (421), so that the pushing assembly (44) pushes the welding rods stored therein from the discharge port (421) to the loading assembly (45) for clamping and conveying along its axial direction; when the welding rods are conveyed to a specified position, the driving member (3) and the laser welding head (2) are controlled to continue the circumferential welding operation until the driving member (3) rotates to a preset angle according to the design drawing, and then the driving member (3), the automatic loading unit (4) and the laser welding head (2) are controlled to end the welding operation and reset.

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