Welding device and welding process for inner container of electric water heater

Abstract

The invention discloses an electric water heater inner container welding device and a welding process, and relates to the technical field of electric water heater inner container welding, the electric water heater inner container welding device comprises a fixed base, a positioning mechanism is installed on one side of the fixed base, and a mechanical arm is installed on one side of the fixed base. A micro air cylinder works to drive a moving frame to move, a second rotating rod and a first rotating rod to rotate, a first fixing plate and an air outlet pipe are driven to do arc-shaped motion, the direction of jet airflow is changed, dust generated by welding is jetted outwards, then a jet opening in the bottom of the air outlet pipe stops working, and the micro air cylinder works to drive the moving frame to move reversely; when the laser welding device works, the four air outlet pipes move inwards to initial positions, and in the process that the spraying assembly moves outwards in a reciprocating mode to spray gas and retracts inwards to stop spraying, dust is blown outwards continuously through outward diffusion of air flow, and the dust is prevented from absorbing or scattering laser energy generated during work of the laser welding device.

Description

Technical Field

[0001] The invention relates to the technical field of inner tank welding of electric water heaters, in particular to an inner tank welding device and a welding process for an electric water heater. Background Art

[0002] An electric water heater is a water heater that uses electricity as energy for heating. It is one of the three major water heaters along with gas water heaters and solar water heaters. The inner tank of an electric water heater refers to the part of the electric water heater that stores hot water. It is usually made of different materials. The production of the inner tank requires welding the joints of the cylinder, upper cover, and lower cover using a welding device.

[0003] For example, the "A Laser Welding Machine for the Inner Tank of an Electric Water Heater" with publication number CN218426349U includes a bed, an end cover mold positioning mechanism, a barrel positioning fixture, a linear rail moving mechanism, a three-axis robotic arm, and a laser welder. The three-axis robotic arm is located on the side of the bed and clamps the laser welder. The barrel positioning fixture is located in the middle of the bed and is used to lift the barrel at the processing height. At both ends of the barrel are end cover mold positioning mechanisms, and one end cover mold positioning mechanism is fixed at one end of the bed.

[0004] In the prior art, it is necessary to keep the welding environment clean and stable during laser welding. Dust and plasma will be generated during welding. The dust will float in the welding area and absorb or scatter the laser energy generated by the laser welder, resulting in uneven energy distribution in the welding area, insufficient welding strength, discontinuous welds and other problems. When a vacuum device is used directly to remove dust from the welding area, the airflow will interfere with the welding process, causing the flow of liquid metal in the molten pool to be disordered, affecting the solidification process of the molten pool and resulting in poor weld formation. Summary of the invention

[0005] The purpose of the present invention is to provide an electric water heater inner tank welding device and a welding process to solve the problem proposed in the above background technology that when a dust suction device is directly used to remove dust from the welding point, the airflow will interfere with the welding process, causing the flow of liquid metal in the molten pool to be disordered, affecting the solidification process of the molten pool, and resulting in poor weld formation.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electric water heater inner tank welding device, comprising a fixed base, a positioning mechanism is installed on one side of the fixed base, a mechanical arm is installed on one side of the fixed base, a welding mechanism is installed on one end of the mechanical arm, the welding mechanism comprises a laser welder, a mounting bracket is installed on one end of the laser welder, two groups of injection assemblies are installed on one side of the mounting bracket, each group of the injection assemblies comprises two air outlet pipes, a telescopic pipe is fixedly connected between the two air outlet pipes in the same group, the outer surfaces of the air outlet pipes are fixedly connected to a first fixing plate, the other end of the first fixing plate The end is fixedly connected with a steering rod, the outside of the steering rod is rotatably connected with a second fixed plate, the other end of the second fixed plate is fixedly connected to one side of the mounting bracket, a direction adjustment assembly is installed on the outside of each group of the injection assemblies, the direction adjustment assembly includes two first rotating rods, the middle part of one of the steering rods in each group is fixedly connected to one end of the first rotating rod, one end of the first rotating rod is rotatably connected to the second rotating rod, one end of the second rotating rod is rotatably connected to a moving push block, one end of the moving push block is fixedly connected to a moving frame, a connecting frame is installed on the outside of the laser welder, and an air suction assembly is installed on one end of the connecting frame.

[0007] Preferably, a connecting pipe is fixedly connected between two first fixing plates in different groups, and a second pipe joint is fixedly connected to the outside of the connecting pipe.

[0008] Preferably, one end of two steering rods in the same group are fixedly connected with a bevel gear, and the two bevel gears are meshed with each other. Through the meshing between the bevel gears, the two bevel gears can be driven to rotate outward or inward at the same time.

[0009] Preferably, the air suction component includes an annular dust suction pipe, one side of the annular dust suction pipe is provided with nozzles in an annular distribution, the other side of the annular dust suction pipe is fixedly connected to an air supply pipeline, one end of the air supply pipeline is fixedly connected to a first pipe joint, the directions of the multiple annularly distributed nozzles are perpendicular to the direction of the light shield and are arranged downward, and one end of the first pipe joint is externally connected to the dust suction component.

[0010] Preferably, a positioning slide bar is fixedly connected to one side of the movable frame, the outside of the positioning slide bar is slidably connected to the mounting bracket, and one end of the positioning slide bar is fixedly connected to a positioning shift plate.

[0011] Preferably, a micro cylinder is fixedly connected to one side of the mounting bracket, and one end of the micro cylinder passes through the mounting bracket and is fixedly connected to one side of the moving frame.

[0012] Preferably, a light shield is fixedly connected to the outside of the connecting frame, and a compensation lamp is fixedly connected to the inner wall of the light shield. There are multiple compensation lamps, and they are all inclined toward the center of the light shield. The compensation lamp can provide additional light to enhance the brightness of the welding area, so that the visual system can obtain clearer and higher-contrast images, which helps to accurately identify the position and shape of the weld and improve the accuracy of weld tracking. The light shield can reduce the scattered and reflected light of the laser, so that the visual system can more accurately obtain the real image of the welding area.

[0013] Preferably, the positioning mechanism includes a first support seat and a second support seat, one end of the first support seat and one end of the second support seat are fixedly connected to one side of the fixed base, one side of the first support seat is fixedly connected to a drive motor, the output end of the drive motor passes through the first support seat and is fixedly connected to a first turntable, the drive motor is composed of a motor and a reducer, and can control the inner tank of the electric water heater to be processed to rotate at a required speed, and weld the joint positions of the inner tank cylinder, upper cover and lower cover of the electric water heater.

[0014] Preferably, a hydraulic cylinder is fixedly connected to one side of the second support seat, one end of the hydraulic cylinder passes through one side of the second support seat and is fixedly connected to a guide push rod, one end of the guide push rod is rotatably connected to the second turntable, one end of the second turntable contacts with one end of the inner tank of the electric water heater, the hydraulic cylinder works to adjust the position of the guide push rod and the second turntable, the first turntable and the second turntable cooperate to position the inner tank of the electric water heater, and the second turntable is rotatably arranged, and can rotate while the inner tank of the electric water heater rotates and welds.

[0015] A welding process for an inner tank of an electric water heater comprises the following steps:

[0016] S1. First, the assembled inner tank of the electric water heater is transferred between the first turntable and the second turntable. One end of the inner tank of the electric water heater is in contact with the first turntable. The hydraulic cylinder drives the second turntable to move and contact with the other end of the inner tank to position the inner tank to be processed.

[0017] S2. The robot arm can drive the welding mechanism to move to the welding position, the driving motor drives the inner liner to be processed to rotate, and the laser welder welds the inner liner;

[0018] S3. During the welding process, one end of the second pipe joint is connected to the compressed gas storage system. The compressed gas storage system outputs the compressed gas from the gas tank through the pneumatic pump. The compressed gas fills the connecting pipe, the gas outlet pipe and the telescopic pipe in sequence and is ejected from the injection port of the gas outlet pipe. The injection ports at the bottom of the gas outlet pipe are all vertically downward in the initial state. Then the micro cylinder drives the moving frame to move, the second rotating rod and the first rotating rod rotate, and the steering rod and the gas outlet pipe rotate in sequence, so that the injection ports at the bottom of the four gas outlet pipes rotate outward, and the gas is ejected in all directions.

[0019] S4. Blow the welding dust outwards. The first pipe joint is externally connected to a dust suction system. The dust blown to the surroundings enters the dust suction system through the annular dust suction pipe and the air supply pipe for collection.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, compressed gas is ejected through the injection port at the bottom of the air outlet pipe, the micro cylinder drives the moving frame to move, the second rotating rod and the first rotating rod rotate, driving the first fixed plate and the air outlet pipe to move in an arc shape, changing the direction of the jet airflow, and ejecting the dust generated by welding outward, then the injection port at the bottom of the air outlet pipe stops working, the micro cylinder drives the moving frame to move in the opposite direction, and the four air outlet pipes move inward to the initial position. In the process of the ejection assembly reciprocatingly moving outward to eject gas and retracting inward to stop ejecting, the dust is continuously blown outward by the airflow diffusion outward, so as to prevent the dust from absorbing or scattering the laser energy generated by the laser welder;

[0022] 2. In the present invention, during the process of diffusing dust outward, the suction component of the external dust suction system works, and the nozzles at the bottom of the annular dust suction pipe are distributed in an annular manner and are all in a vertical direction to absorb the dust diffusing outward. The dust is sent into the dust suction system through the annular dust suction pipe and the air pipeline for collection and treatment, so as to keep the welding environment clean and stable and avoid interference of airflow and dust on the welding process;

[0023] 3. In the present invention, by cooperating with the light shield and the compensation lamp arranged obliquely inside the light shield, when the dust generated by welding is sprayed outward, the light shield can block the diffused dust to prevent the dust from spreading over a large range, while reducing the scattered and reflected light of the laser. The compensation lamp can provide additional light to enhance the brightness of the welding area, which is helpful to accurately identify the position and shape of the weld and improve the accuracy of weld tracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the connection structure between the welding mechanism and the mechanical arm of an electric water heater tank welding device of the present invention;

[0025] Figure 2 A schematic diagram of a welding mechanism connection structure of an electric water heater tank welding device of the present invention;

[0026] Figure 3 It is a schematic diagram of the internal cross-sectional structure of a welding mechanism of an electric water heater tank welding device of the present invention;

[0027] Figure 4 It is a schematic diagram of the internal planar structure of a welding mechanism of an electric water heater tank welding device of the present invention;

[0028] Figure 5 A flow chart of reducing airflow interference in a welding device for an inner tank of an electric water heater according to the present invention;

[0029] Figure 6 It is a schematic diagram of the working state of the injection assembly of the inner tank welding device of an electric water heater according to the present invention;

[0030] Figure 7 It is a schematic diagram of the disassembled structure of a welding mechanism of an electric water heater tank welding device of the present invention;

[0031] Figure 8 It is a schematic diagram of the installation of the connection structure of the injection assembly and the direction adjustment assembly of the inner tank welding device of an electric water heater of the present invention;

[0032] Fig. 9 It is a schematic diagram of the connection structure of the injection assembly of an electric water heater tank welding device of the present invention;

[0033] Fig.10 It is a first three-dimensional structural schematic diagram of an electric water heater inner tank welding device of the present invention;

[0034] Fig.11 It is a second three-dimensional structural schematic diagram of an electric water heater inner tank welding device of the present invention.

[0035] In the figure: 1, fixed base; 2, welding mechanism; 21, laser welder; 22, light shield; 23, suction assembly; 231, first pipe joint; 232, gas pipeline; 233, annular dust suction pipe; 24, connection frame; 25, compensation lamp; 26, injection assembly; 261, first fixed plate; 262, air outlet pipe; 263, second pipe joint; 264, bevel gear; 265, telescopic tube; 266, second fixed plate; 267, steering rod; 2 68. Connecting pipe; 27. Direction adjustment assembly; 271. Positioning shift plate; 272. First rotating rod; 273. Second rotating rod; 274. Micro cylinder; 275. Moving frame; 276. Moving push block; 277. Positioning slide bar; 28. Mounting bracket; 3. Robotic arm; 4. Positioning mechanism; 41. First supporting seat; 42. Driving motor; 43. First turntable; 44. Second turntable; 45. Guide push rod; 46. Second supporting seat; 47. Hydraulic cylinder. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described 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 creative work are within the scope of protection of the present invention.

[0037] Example 1: Reference Figure 1 - Fig.11 As shown: an electric water heater inner tank welding device, comprising a fixed base 1, a positioning mechanism 4 is installed on one side of the fixed base 1, a mechanical arm 3 is installed on one side of the fixed base 1, a welding mechanism 2 is installed on one end of the mechanical arm 3, the welding mechanism 2 comprises a laser welder 21, a mounting bracket 28 is installed on one end of the laser welder 21, two groups of injection assemblies 26 are installed on one side of the mounting bracket 28, each group of injection assemblies 26 comprises two air outlet pipes 262, a telescopic pipe 265 is fixedly connected between the two air outlet pipes 262 of the same group, the outer surface of the air outlet pipe 262 is fixedly connected to a first fixed plate 261, the other end of the first fixed plate 261 is fixedly connected to a steering rod 267, the steering rod 2 The outside of the laser welder 21 is rotatably connected to a second fixed plate 266, and the other end of the second fixed plate 266 is fixedly connected to one side of the mounting bracket 28. The outside of each group of injection assemblies 26 is installed with a direction adjustment assembly 27, and the direction adjustment assembly 27 includes two first rotating rods 272, and the middle part of one of the steering rods 267 in each group is fixedly connected to one end of the first rotating rod 272, and one end of the first rotating rod 272 is rotatably connected to a second rotating rod 273, and one end of the second rotating rod 273 is rotatably connected to a moving push block 276, and one end of the moving push block 276 is fixedly connected to a moving frame 275. The outside of the laser welder 21 is installed with a connecting frame 24, and one end of the connecting frame 24 is installed with an air suction assembly 23;

[0038] A connecting pipe 268 is fixedly connected between two first fixed plates 261 of different groups, and a second pipe joint 263 is fixedly connected to the outside of the connecting pipe 268; one end of the two steering rods 267 of the same group is fixedly connected to a bevel gear 264, and the two bevel gears 264 are meshed, and the meshing between the bevel gears 264 can drive the two bevel gears 264 to rotate outward or inward at the same time; the suction component 23 includes an annular dust suction pipe 233, and nozzles are distributed in an annular manner on one side of the annular dust suction pipe 233, and the other side of the annular dust suction pipe 233 is fixedly connected to a gas pipeline 232, and the gas pipeline 232 One end of the movable frame 275 is fixedly connected to a first pipe joint 231, and the directions of the multiple nozzles distributed in a ring are perpendicular to the direction of the light shield 22 and are arranged downward. One end of the first pipe joint 231 is externally connected to a dust suction component; one side of the movable frame 275 is fixedly connected to a positioning slide bar 277, and the outside of the positioning slide bar 277 is slidably connected to one side of the mounting bracket 28, and one end of the positioning slide bar 277 is fixedly connected to a positioning shift plate 271; one side of the mounting bracket 28 is fixedly connected to a micro cylinder 274, and one end of the micro cylinder 274 passes through one side of the mounting bracket 28 and is fixedly connected to one side of the movable frame 275.

[0039] The robot arm 3 is set as a multi-axis robot, which can drive the welding mechanism 2 to move in a three-dimensional space. The robot arm 3 drives the welding mechanism 2 to move, and moves the laser welder 21 to the welding position for welding. When the laser welder 21 is welding, the second pipe joint 263 is externally connected to a compressed gas storage system. The compressed gas storage system consists of a gas storage tank, a pneumatic pump and a delivery pipe. The compressed gas is stored in the gas storage tank, and the compressed gas is output from the gas storage tank through the pneumatic pump. The first pipe joint 231 is externally connected to a dust suction system. The dust suction system consists of a dust suction host, a pipe network The vacuum cleaner 260 is composed of a vacuum cleaner assembly, harmful gases and dust are sucked into a large-capacity collection box through a vacuum cleaner pipe, and the compressed gas enters the connecting pipe 268 and the two outlet pipes 262 through a second pipe joint 263, and enters the other two outlet pipes 262 through a connected telescopic pipe 265. A plurality of injection ports are arranged at the bottom of the outlet pipe 262, and the plurality of injection ports are evenly distributed. The compressed gas is ejected through the injection ports at the bottom of the outlet pipe 262, and the initial state of the airflow ejected from the injection ports at the bottom of the outlet pipe 262 is vertical.

[0040] During the injection process, the micro cylinder 274 drives the moving frame 275 to move, and the positioning slide bar 277 and the positioning shift plate 271 move accordingly, driving the positioning slide bar 277 to slide in the mounting bracket 28, and the fixed moving frame 275 makes a linear motion. During the linear movement of the moving frame 275, the moving push block 276 moves accordingly, and the second rotating rod 273 and the first rotating rod 272 rotate, driving the steering rod 267 connected thereto to rotate. A bevel gear 264 is installed at one end of each group of steering rods 267, and the two bevel gears 264 of the same group are meshed with each other. When the steering rod 267 connected to the moving rod 272 rotates, another steering rod 267 of the group rotates at the same time, thereby driving the multiple first fixed plates 261 and the air outlet pipes 262 to make arc movements. The injection ports at the bottom of the four air outlet pipes 262 are tilted outward to change the direction of the injection airflow, and the dust generated by welding is ejected outward. The light shield 22 can block the diffused dust to prevent the dust from spreading over a large range. The telescopic tube 265 has a certain telescopic range. When the two connected air outlet pipes 262 expand outward, the telescopic tube 265 can be extended to prevent the airflow from being affected.

[0041] In the process of diffusing the dust outward, the suction component 23 of the external dust suction system works, and the nozzles at the bottom of the annular dust suction pipe 233 are distributed in a ring shape and are all in a vertical direction to absorb the dust diffused outward. The dust is sent into the dust suction system through the annular dust suction pipe 233 and the air supply pipe 232 for collection and treatment. Then the compressed gas storage system stops supplying gas, and the micro cylinder 274 works to drive the moving frame 275 to move in the opposite direction. The four air outlet pipes 262 move inward to the initial position, and the injection port on the air outlet pipe 262 returns to a vertical state. After the air outlet pipe 262 returns to the initial position, the compressed gas storage The system continues to work to deliver compressed gas, and at the same time, the air outlet pipe 262 begins to move outward, and the micro cylinder 274 works to drive the injection assembly 26 to expand outward and retract inward. The compressed gas storage system supplies gas intermittently. In the process of the injection assembly 26 moving back and forth to inject gas and retract inward to stop injecting, the airflow continues to diffuse outward and blow the dust outward. At the same time, stopping the airflow during the retraction process can prevent the airflow from bringing dust and plasma back to the inner circle, and prevent dust from absorbing or scattering the laser energy generated by the laser welder 21, thereby ensuring the stability of the welding process and the welding quality.

[0042] Embodiment 2: Figure 3 , Figure 4 , Fig.10 and Fig.11As shown, the outside of the connecting frame 24 is fixedly connected to a light shield 22, and the inner wall of the light shield 22 is fixedly connected to a compensation lamp 25. There are multiple compensation lamps 25, and they are all inclined toward the center of the light shield 22. The compensation lamp 25 can provide additional light to enhance the brightness of the welding area, so that the visual system can obtain clearer and higher-contrast images, which is helpful to accurately identify the position and shape of the weld and improve the accuracy of weld tracking. The light shield 22 can reduce the scattering and reflection of the laser, so that the visual system can more accurately obtain the real image of the welding area; the positioning mechanism 4 includes a first support seat 41 and a second support seat 46, one end of the first support seat 41 and one end of the second support seat 46 are fixedly connected to one side of the fixed base 1, and one side of the first support seat 41 is fixedly connected to a drive motor 42, and the output end of the drive motor 42 A first turntable 43 is fixedly connected through the first support seat 41, and a driving motor 42 is composed of a motor and a reducer, which can control the inner tank of the electric water heater to be processed to rotate at a required speed, and weld the joint position of the inner tank cylinder, the upper cover and the lower cover of the electric water heater; a hydraulic cylinder 47 is fixedly connected to one side of the second support seat 46, and one end of the hydraulic cylinder 47 is fixedly connected to a guide push rod 45 through one side of the second support seat 46, and one end of the guide push rod 45 is rotatably connected to the second turntable 44, and one end of the second turntable 44 contacts one end of the inner tank of the electric water heater. The hydraulic cylinder 47 works to adjust the position of the guide push rod 45 and the second turntable 44, and the first turntable 43 and the second turntable 44 cooperate to position the inner tank of the electric water heater. At the same time, the second turntable 44 is set to rotate, and can rotate while the inner tank of the electric water heater rotates and welds.

[0043] When welding the inner tank of the electric water heater to be processed, the cylinder, the upper cover and the lower cover are assembled into the inner tank, and the assembled inner tank is placed on the positioning mechanism 4, one end of the inner tank abuts against one side of the first turntable 43, the hydraulic cylinder 47 works to drive the guide push rod 45 and the second turntable 44 to move, so that the second turntable 44 abuts against the other end of the inner tank, and the inner tank is positioned by the cooperation between the second turntable 44 and the first turntable 43, the driving motor 42 works to drive the first turntable 43 to rotate, and the inner tank rotates accordingly, and welding is performed at different locations of the seam. During the welding process, the setting of the light shield 22 can block part of the strong light, so that the light conditions in the welding area are more stable and controllable, and the compensation lamps 25 are installed obliquely on the four side walls inside the light shield 22, and multiple inclined compensation lamps 25 are all irradiated on the central area of ​​the welding, providing additional light, enhancing the brightness of the welding area, and helping the visual system to accurately identify the weld position and shape, and improve the accuracy of weld tracking.

[0044] Embodiment 3: A welding process for an inner tank of an electric water heater, comprising the following steps:

[0045] S1. First, the assembled inner tank of the electric water heater is transferred between the first turntable 43 and the second turntable 44. One end of the inner tank of the electric water heater is in contact with the first turntable 43. The hydraulic cylinder 47 drives the second turntable 44 to move and contact with the other end of the inner tank, so as to position the inner tank to be processed and prevent the inner tank from moving during processing.

[0046] S2, the robot arm 3 can drive the welding mechanism 2 to move to the welding position, the driving motor 42 can drive the inner liner to be processed to rotate, and the different joints of the inner liner can be welded. The laser welder 21 welds the inner liner, and the four side walls of the inner part of the light shield 22 are all inclinedly installed with compensation lamps 25 for lighting to enhance the brightness of the welding area;

[0047] S3. During welding, one end of the second pipe joint 263 is connected to the compressed gas storage system. The compressed gas storage system outputs the compressed gas from the gas tank through the pneumatic pump. The compressed gas fills the connecting pipe 268, the gas outlet pipe 262 and the telescopic pipe 265 in sequence, and is ejected from the injection port of the gas outlet pipe 262. The injection ports at the bottom of the gas outlet pipe 262 are all downwardly vertical in the initial state. Then the micro cylinder 274 works to drive the moving frame 275 to move, the second rotating rod 273 and the first rotating rod 272 rotate, and the steering rod 267 and the gas outlet pipe 262 rotate in sequence, so that the injection ports at the bottom of the four gas outlet pipes 262 rotate outward, and the gas is ejected in all directions, so that the dust floating around is diffused outward to prevent accumulation at the welding point and affecting the welding;

[0048] S4. Blow the welding dust outwards. The first pipe joint 231 is connected to an external dust suction system. The suction component 23 works. The nozzles at the bottom of the annular dust suction pipe 233 are distributed in an annular manner and are all in a vertical direction. The dust diffused outwards is absorbed. The dust blown around enters the dust suction system through the annular dust suction pipe 233 and the air supply pipe 232 for collection.

[0049] The working principle and use method of the device are as follows: first, the cylinder, the upper cover and the lower cover are assembled into an inner tank, and the assembled inner tank of the electric water heater is transferred to the positioning mechanism 4 by the manipulator, and one end of the inner tank abuts against one side of the first turntable 43, and the hydraulic cylinder 47 drives the guide push rod 45 and the second turntable 44 to move, so that the second turntable 44 abuts against the other end of the inner tank, and the inner tank is positioned by the cooperation between the second turntable 44 and the first turntable 43, and the driving motor 42 drives the first turntable 43 to rotate, and the inner tank rotates accordingly, so that the seams at different positions can be conveniently welded, and the manipulator 3 moves the laser welder 21 to the welding position for welding. During the welding process, one end of the second pipe joint 263 is externally connected to the compressed gas storage system, and the compressed gas enters the connecting pipe 268 and the two outlet pipes 262 through the second pipe joint 263, and enters the other two outlet pipes 262 through the connected telescopic pipe 265, and the compressed gas is ejected through the injection port at the bottom of the outlet pipe 262;

[0050] Then the micro cylinder 274 works to drive the moving frame 275 to move, and the positioning slide bar 277 and the positioning shift plate 271 move accordingly, driving the positioning slide bar 277 to slide on the mounting bracket 28, and the fixed moving frame 275 makes a linear motion, and the moving push block 276 moves accordingly, and the second rotating rod 273 and the first rotating rod 272 rotate, driving the steering rod 267 to rotate, and the first fixed plate 261 and the air outlet pipe 262 make an arc motion, and the injection ports at the bottom of the four air outlet pipes 262 are tilted outward, changing the direction of the injection airflow, and ejecting the dust generated by welding outward. At this time, the external dust suction system of the first pipe joint 231 works, and the nozzle at the bottom of the annular dust suction pipe 233 works to absorb the diffused dust. The dust is collected and sent to the dust collection system through the annular dust collection pipe 233 and the air supply pipe 232 for collection and treatment. Then the annular dust collection pipe 233 continues to work to absorb dust, and the micro cylinder 274 works to drive the moving frame 275 to move in the opposite direction. The four air outlet pipes 262 move inward to the initial position. During this process, the air outlet pipes 262 stop spraying gas outward. After returning to the initial position, the air outlet pipes 262 continue to move outward to spray gas, thereby continuously diffusing the dust outward through the airflow to prevent the dust from absorbing or scattering the laser energy generated by the laser welder 21. Compensation lamps 25 are installed obliquely on the four side walls inside the light shield 22 to provide additional light and enhance the brightness of the welding area.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding device for an inner tank of an electric water heater, comprising a fixing base (1), characterized in that: A positioning mechanism (4) is installed on one side of the fixed base (1), a mechanical arm (3) is installed on one side of the fixed base (1), a welding mechanism (2) is installed on one end of the mechanical arm (3), the welding mechanism (2) comprises a laser welder (21), a mounting bracket (28) is installed on one end of the laser welder (21), two groups of injection assemblies (26) are installed on one side of the mounting bracket (28), each group of the injection assemblies (26) comprises two air outlet pipes (262), and the two injection assemblies (26) in the same group are connected to each other. The outlet pipes (262) are fixedly connected with a telescopic pipe (265), the outer surfaces of the outlet pipes (262) are fixedly connected with a first fixing plate (261), the other end of the first fixing plate (261) is fixedly connected with a steering rod (267), the outer part of the steering rod (267) is rotatably connected with a second fixing plate (266), the other end of the second fixing plate (266) is fixedly connected with one side of the mounting bracket (28), and the outer part of each group of the injection assemblies (26) is equipped with a direction adjustment assembly (27 ), the direction adjustment component (27) is used to adjust the direction of the injection port in the injection component (26), the injection component (26) is used to blow the floating dust to the surroundings, the direction adjustment component (27) comprises two first rotating rods (272), the middle part of one of the turning rods (267) in each group is fixedly connected to one end of the first rotating rod (272), one end of the first rotating rod (272) is rotatably connected to the second rotating rod (273), and one end of the second rotating rod (273) is rotatably connected to the moving rod (273). A movable push block (276), one end of which is fixedly connected to a movable frame (275), a connecting frame (24) is installed on the outside of the laser welder (21), one end of which is installed with an air suction component (23), the air suction component (23) is used to absorb dust blown around by the injection component (26), the air suction component (23) is arranged on the outer ring of the injection component (26), and the nozzle position of the air suction component (23) is located below the nozzle of the injection component (26).

2. The electric water heater tank welding device according to claim 1, characterized in that: A connecting pipe (268) is fixedly connected between two first fixing plates (261) of different groups, and a second pipe joint (263) is fixedly connected to the outside of the connecting pipe (268).

3. An electric water heater inner tank welding device according to claim 2, characterized in that: One end of two steering rods (267) in the same group is fixedly connected to a bevel gear (264), and the two bevel gears (264) are meshed with each other.

4. The electric water heater inner tank welding device according to claim 3, characterized in that: The air suction component (23) comprises an annular dust suction pipe (233), one side of the annular dust suction pipe (233) is provided with nozzles distributed in an annular manner, the other side of the annular dust suction pipe (233) is fixedly connected to an air supply pipeline (232), and one end of the air supply pipeline (232) is fixedly connected to a first pipeline joint (231).

5. An electric water heater inner tank welding device according to claim 4, characterized in that: A positioning slide bar (277) is fixedly connected to one side of the moving frame (275), the outside of the positioning slide bar (277) is slidably connected to the mounting bracket (28), and one end of the positioning slide bar (277) is fixedly connected to a positioning moving plate (271).

6. The electric water heater inner tank welding device according to claim 5, characterized in that: A micro cylinder (274) is fixedly connected to one side of the mounting bracket (28), and one end of the micro cylinder (274) passes through the mounting bracket (28) and is fixedly connected to one side of the moving frame (275).

7. An electric water heater inner tank welding device according to claim 6, characterized in that: The outside of the connection frame (24) is fixedly connected to a light shield (22), and the inner side wall of the light shield (22) is fixedly connected to a compensation lamp (25).

8. The electric water heater inner tank welding device according to claim 7, characterized in that: The positioning mechanism (4) comprises a first support seat (41) and a second support seat (46); one end of the first support seat (41) and one end of the second support seat (46) are both fixedly connected to one side of the fixed base (1); one side of the first support seat (41) is fixedly connected to a drive motor (42); an output end of the drive motor (42) passes through the first support seat (41) and is fixedly connected to a first turntable (43).

9. An electric water heater inner tank welding device according to claim 8, characterized in that: A hydraulic cylinder (47) is fixedly connected to one side of the second support seat (46), one end of the hydraulic cylinder (47) passes through one side of the second support seat (46) and is fixedly connected to a guide push rod (45), and one end of the guide push rod (45) is rotatably connected to the second turntable (44).

10. A welding process for the inner tank of an electric water heater, characterized in that: An electric water heater tank welding device according to any one of claims 1 to 9 is used, comprising the following steps: S1. First, the assembled inner tank of the electric water heater is transferred between the first turntable (43) and the second turntable (44), one end of the inner tank of the electric water heater is in contact with the first turntable (43), and the hydraulic cylinder (47) drives the second turntable (44) to move and contact with the other end of the inner tank, so as to position the inner tank to be processed; S2, the robot arm (3) can drive the welding mechanism (2) to move to the welding position, the driving motor (42) drives the inner liner to be processed to rotate, and the laser welder (21) welds the inner liner; S3. During the welding process, one end of the second pipe joint (263) is connected to the compressed gas storage system. The compressed gas storage system outputs the compressed gas from the gas storage tank through the pneumatic pump. The gas sequentially fills the connecting pipe (268), the gas outlet pipe (262) and the telescopic pipe (265), and is ejected from the ejection port of the gas outlet pipe (262). The ejection ports at the bottom of the gas outlet pipe (262) are all downwardly vertical in the initial state. Then, the micro cylinder (274) drives the moving frame (275) to move, the second rotating rod (273) and the first rotating rod (272) rotate, and the steering rod (267) and the gas outlet pipe (262) rotate sequentially, so that the ejection ports at the bottom of the four gas outlet pipes (262) rotate outward, and the gas is ejected in all directions. S4, the welding dust is blown outwards, the first pipe joint (231) is connected to an external dust collection system, and the dust blown to the surroundings enters the dust collection system through the annular dust collection pipe (233) and the air supply pipe (232) for collection.

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