Welding device and process for kettle bottom thick film heating

Abstract

The kettle bottom thick film heating welding device comprises a base, supports are fixed to the outer wall of the top of the base, a first limiting seat and a second limiting seat are fixed between the two supports, a gear ring is movably connected to the circumferential inner wall of the first limiting seat, and a rotary disc is movably connected to the circumferential inner wall of the second limiting seat. A through hole formed in the surface of the rotary disc is movably connected with a feeding assembly, and the feeding assembly comprises a driven shaft movably connected to the surface of the rotary disc and a lower die mechanism fixed to the top of the driven shaft. The two independent feeding assemblies which are symmetrical in structure are arranged, the relative positions of the feeding assemblies are driven to be switched through the gear and gear ring transmission system, separation of the two core processes of welding and slag removal in space and parallelism of time are achieved, when welding is conducted on one station, the other station can synchronously conduct welding slag removal and workpiece loading and unloading, and the welding efficiency is improved. The utilization rate of equipment is maximized, and the working efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of thick film welding technology for kettle bottoms, and more particularly to a welding device and process for heating thick film at the bottom of kettles. Background Technology

[0002] In the manufacturing of modern kitchen appliances (such as electric kettles and health pots), the connection between the kettle body and the bottom thick film heating element is usually achieved by welding. This welding process must meet requirements such as high strength, high sealing performance and excellent thermal conductivity. Traditional welding production methods typically rely on single-station operation, where the workpiece is fixed manually or with simple fixtures, the welding equipment surrounds the workpiece or the workpiece rotates on the equipment, and after welding is completed, the workpiece is removed and transferred to another station for slag cleaning and inspection. This method separates the welding and cleaning processes, resulting in a long production cycle, low equipment utilization, and difficulty in meeting the needs of large-scale production. Therefore, the industry urgently needs an integrated automated welding device that can integrate processes in parallel to improve welding efficiency, in order to solve the problems of low production efficiency and insufficient process stability in existing technologies. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a welding device and process for heating a thick film at the bottom of a kettle.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A welding device for heating a thick film at the bottom of a kettle includes a base. A bracket is fixed to the top outer wall of the base. A limiting seat 1 and a limiting seat 2 are fixed between two brackets. A gear ring is movably connected to the inner circumference of the limiting seat 1, and a turntable is movably connected to the inner circumference of the limiting seat 2. The gear ring and the turntable are limited by a limiting mechanism. A feeding component is movably connected to a through hole on the surface of the turntable. A vertical plate is fixed to the top outer wall of the base. A drive shaft is movably connected to a through hole on the top of the vertical plate. The gear ring, the drive shaft, and the feeding component are driven by a gear transmission mechanism.

[0005] As a further embodiment of the present invention: the feeding assembly includes a driven shaft movably connected to the surface of the turntable and a lower mold mechanism fixed to the top of the driven shaft. The lower mold mechanism includes a lower mold part and a lower positioning part. The lower mold part is fixed to the top of the driven shaft, and the lower positioning part is integrally formed on the top of the lower mold part.

[0006] As a further embodiment of the present invention: the gear transmission mechanism includes a driven gear connected to the outer wall of the driven shaft by a key, the driven gear meshing with a gear ring, and the gear transmission mechanism also includes a driving gear connected to the outer wall of the driving shaft by a key and meshing with the driven gear.

[0007] As a further embodiment of the present invention: an electric telescopic rod is fixed to the top outer wall of the base, a pressure sensor is fixed to the output end of the electric telescopic rod by a pin, a connecting rod is fixed to the top of the pressure sensor, a rotating shaft is installed at the end of the connecting rod away from the pressure sensor, and an upper mold mechanism is movably connected to the bottom of the rotating shaft.

[0008] As a further embodiment of the present invention: the upper mold mechanism includes an upper mold part and an upper positioning part, the upper mold part is fixed to the bottom of the rotating shaft, and the upper positioning part is integrally formed on the bottom of the upper mold part.

[0009] As a further embodiment of the present invention: a mounting bracket is fixed to the top outer wall of the base, a drive motor is fixed to the top inner wall of the mounting bracket, and synchronous pulleys are fixed to the output end of the drive motor and the outer circumference of the drive shaft. The two synchronous pulleys are driven by a synchronous belt, and a controller is installed on the side of the base.

[0010] As a further embodiment of the present invention: the limiting mechanism includes an intermediate rod welded to the side of the connecting rod, one end of the intermediate rod is welded with a limiting pin, and the limiting mechanism also includes a limiting frame one and a limiting frame two respectively fixed to the top outer wall of the gear ring and the top outer wall of the turntable, the top of the limiting frame one is provided with a limiting hole one, and the top of the limiting frame two is provided with a limiting hole two.

[0011] As a further embodiment of the present invention: a support rod is fixed to the top outer wall of the base, a fixing plate is welded to the outer circumference of the support rod, and a welding head is fixed to the surface of the fixing plate by an embedded method.

[0012] As a further embodiment of the present invention: a jet disc is fixed to the top outer wall of the support rod, a mating flange is welded to the top outer wall of the jet disc, and an exhaust pipe installed on the side of the jet disc includes a connecting pipe welded to the side of the jet disc and an adjusting pipe movably connected to its inner wall. The two ends of the spring sleeved on the outer wall of the adjusting pipe are respectively fixed to one end of the connecting pipe and one side inner wall of the adjusting pipe. An adjusting hole is opened at the bottom of the adjusting pipe, and an air blowing pipe is welded to the bottom of the connecting pipe.

[0013] A welding process for heating a thick film at the bottom of a kettle includes the following steps: S1: Start the controller to control the electric telescopic rod to go down, drive the upper mold mechanism to press down, and the upper and lower mold mechanisms cooperate to complete the clamping and positioning of the workpiece. The limit pin goes down with it and inserts into the limit hole two of the limit frame two, locking the turntable and the limit seat two. S2: The drive motor drives the active gear to rotate, and the active gear drives the driven gear to rotate. Since the turntable is locked, the driven gear drives the workpiece to rotate around the driven shaft. During the uniform rotation of the workpiece, the welding equipment is started, and the welding head is used to continuously weld the joint. S3: After welding is completed, the electric telescopic rod drives the upper mold mechanism and the limit pin to move upward. The limit pin comes out from the limit hole two and inserts into the limit hole one of the limit frame one, locking the gear ring and the limit seat one. The drive motor continues to work, driving the driven gear to revolve around the fixed gear ring, driving the turntable to rotate, realizing the interchange between the welding station and the slag removal station. S4: The workpiece located at the slag removal station rotates with its driven shaft. The airflow from the blower is turned on, which pushes the regulating pipe to slide, so that the regulating hole is connected to the air blowing pipe. Compressed air is sprayed out from the air blowing pipe, blowing the weld of the rotating workpiece to remove the weld slag.

[0014] Compared with the prior art, the present invention provides a welding device and process for heating a thick film at the bottom of a kettle, which has the following beneficial effects: 1. By setting up two sets of independent feeding components with symmetrical structure and driving their relative position switching through a gear and gear ring transmission system, the two core processes of "welding" and "slag removal" are separated in space and parallel in time. When one set of workstations is welding, the other set can simultaneously clean the welding slag and load and unload the workpiece, maximizing equipment utilization and significantly improving work efficiency.

[0015] 2. The switchable limiting mechanism, consisting of a limiting pin, limiting hole one, and limiting hole two, enables switching between two motion modes: When the turntable is locked by the limiting pin, the power drives the workpiece to rotate, meeting the rotation requirements for welding or slag removal. When the gear ring is locked, the power drives the turntable and the two workstations to revolve together, achieving workstation interchange. This structure uses a single drive motor to achieve the motion required for both processes, resulting in a compact design.

[0016] 3. The upper mold mechanism is integrated with the connecting rod, pressure sensor and electric telescopic rod, so that the upper mold can not only press down vertically to accurately clamp the workpiece, but also rotate with the feeding component during welding. The pressure sensor enables real-time monitoring and closed-loop control of the clamping force, effectively avoiding workpiece damage or poor welding caused by improper pressure.

[0017] 4. The lower mold mechanism can be quickly installed onto the driven shaft through a standardized interface. When changing to different specifications of the kettle body, only the corresponding upper and lower mold modules need to be replaced simultaneously to quickly realize the production line change of the product, which has strong versatility.

[0018] 5. The regulating tube can slide under the action of spring and air pressure. When there is no air pressure, the regulating hole is misaligned with the air blowing tube to prevent dust backflow and play a self-sealing dust prevention role. When there is air pressure, it automatically connects to blow air, realizing the "passive" automatic control of the air circuit, which is stable and reliable.

[0019] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This invention has a simple structure and is easy to operate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a welding device for heating a thick film at the bottom of a kettle, as proposed in this invention. Figure 2 This is a side view structural diagram of a welding device for heating a thick film at the bottom of a kettle, as proposed in this invention. Figure 3 This is a schematic diagram of the overall structure of the feeding assembly of a welding device for heating a thick film at the bottom of a kettle, as proposed in this invention. Figure 4 This is a schematic diagram of the overall structure of the limiting component of a welding device for thick film heating at the bottom of a kettle, as proposed in this invention. Figure 5 This is a schematic diagram of the welding assembly structure of a welding device for heating a thick film at the bottom of a kettle, as proposed in this invention. Figure 6 This is a schematic diagram of the cleaning component structure of a welding device for heating a thick film at the bottom of a kettle, as proposed in this invention.

[0021] In the diagram: 1. Base; 2. Limiting seat 1; 3. Connecting rod; 4. Rotating shaft; 5. Upper mold; 6. Gear ring; 7. Lower mold; 8. Controller; 9. Bracket; 10. Turntable; 11. Spring; 12. Limiting seat 2; 13. Vertical plate; 14. Support rod; 15. Synchronous belt; 16. Drive motor; 17. Mounting bracket; 18. Synchronous pulley; 19. Drive gear; 20. Drive shaft; 21. Lower positioning component; 22. Limiting bracket 1; 23. Limiting hole 1; 24. Limiting hole 2; 25. Limiting bracket 2; 26. Driven gear; 27. Upper positioning component; 28. Limiting pin; 29. ​​Intermediate rod; 30. Pressure sensor; 31. Electric telescopic rod; 32. Driven shaft; 33. Air blowing pipe; 34. Connecting pipe; 35. Fixing plate; 36. Welding head; 37. Adjusting pipe; 38. Adjusting hole; 39. Air jet disc; 40. Connecting flange. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Example 1:

[0024] A welding device for heating a thick film at the bottom of a kettle, such as Figures 1 to 6As shown, the system includes a base 1. A bracket 9 is fixed to the top outer wall of the base 1 by screws. Limiting seat 1 2 and limiting seat 2 12 are fixed between the two brackets 9 by screws. A gear ring 6 is rotatably connected to the inner circumference of limiting seat 1 2. A turntable 10 is rotatably connected to the inner circumference of limiting seat 2 12. A feeding assembly is rotatably connected to a through hole on the surface of the turntable 10. The feeding assembly includes a driven shaft 32 rotatably connected to the surface of the turntable 10 and a lower mold mechanism fixed to the top of the driven shaft 32. A driven gear 26 that meshes with the gear ring 6 is connected to the outer circumference of the driven shaft 32 by a key. A vertical plate 13 is fixed to the top outer wall of the base 1 by screws. A drive shaft 20 is rotatably connected to a through hole on the top of the vertical plate 13. A drive gear 19 that meshes with the driven gear 26 is connected to the outer circumference of the drive shaft 20 by a key. When welding is required between the kettle body and the heating film, first select the corresponding lower mold mechanism according to the specifications of the kettle body and the heating film. After fixing the lower mold mechanism and the top of the driven shaft 32, place the heating film at the bottom of the kettle body to facilitate subsequent welding between the two. Preferably, in this embodiment, there are two sets of feeding components. The two sets of feeding components are set so that when the pot body and the heating film on one set of feeding components are being welded, the pot body and the heating film on the other set of feeding components are being cleaned of weld slag at the weld seam. Specifically, during welding, the turntable 10 is positioned relative to the second limiting seat 12, keeping the second limiting seat 12 and the turntable 10 relatively stationary, while the gear ring 6 and the first limiting seat 2 continue to maintain a rotational connection. When the drive gear 19 and the drive shaft 20 rotate, the drive gear 19 drives the driven gear 26 meshing with it to rotate, and the driven gear 26 drives the gear ring 6 meshing with it to rotate relative to the first limiting seat 2. The lower mold mechanism drives the pot body and the heating film to rotate around the driven shaft 32 as the axis, which facilitates the subsequent welding of the connection between the pot body and the heating film. During this process, another set of feeding components drives the completed pot body and the heating film to rotate, which facilitates the cleaning of the weld slag at the weld seam. After the welding between the kettle body and the heating film is completed, the limiting seat 12 and the gear ring 6 are limited, while the limiting between the turntable 10 and the limiting seat 22 is released. This allows the driving gear 19 to drive the driven gear 26, which meshes with it, to revolve around the gear ring 6 when the driving gear 19 and the driving shaft 20 rotate. This continues until the positions of the two feeding components are switched. This process is repeated continuously, and the two feeding components simultaneously perform welding between the kettle body and the heating film, as well as cleaning the weld slag after welding, thus improving work efficiency.

[0025] The lower mold mechanism includes a lower mold part 7 and a lower positioning part 21. The lower mold part 7 is fixed to the top of the driven shaft 32, and the lower positioning part 21 is integrally formed on the top of the lower mold part 7. There are multiple ways to fix the lower mold 7 and the driven shaft 32, such as screw fixing or clip fixing. The driven shaft 32 and the lower mold 7 can be disassembled and replaced. The lower positioning part 21 can be used to position the kettle body and the heating film.

[0026] An electric telescopic rod 31 is fixed to the top outer wall of the base 1 by screws. A pressure sensor 30 is fixed to the output end of the electric telescopic rod 31 by a pin. A connecting rod 3 is fixed to the top of the pressure sensor 30 by screws. A rotating shaft 4 is installed at the end of the connecting rod 3 away from the pressure sensor 30. An upper mold mechanism is rotatably connected to the bottom of the rotating shaft 4. The upper mold mechanism includes an upper mold part 5 and an upper positioning part 27. The upper mold part 5 is fixed to the bottom of the rotating shaft 4, and the upper positioning part 27 is integrally formed on the bottom of the upper mold part 5. During the welding process between the kettle body and the heating film, in order to ensure the stability of the kettle body and the heating film during the welding process, the upper mold part 5 and the upper positioning part 27 are driven to move downward by the electric telescopic rod 31 before welding. This allows the upper mold mechanism and the lower mold mechanism to cooperate in the vertical direction to limit the position between the kettle body and the heating film. The pressure sensor 30 can monitor the pressure between the kettle body and the heating film to avoid damage caused by excessive pressure between the kettle body and the heating film.

[0027] The top outer wall of the base 1 is fixed with a mounting bracket 17 by screws, the top inner wall of the mounting bracket 17 is fixed with a drive motor 16 by screws, and the output end of the drive motor 16 and the outer circumference of the drive shaft 20 are both fixed with synchronous pulleys 18 by screws. The two synchronous pulleys 18 are driven by a synchronous belt 15. The synchronous belt 15 and synchronous pulley 18 are used to drive the drive motor 16 to indirectly drive the drive gear 19 and drive shaft 20 to rotate, thereby realizing the revolution when the two feeding components switch positions and the rotation when welding or cleaning slag.

[0028] The connecting rod 3 has a middle rod 29 welded to its side. A limiting pin 28 is welded to one end of the middle rod 29. The top outer wall of the gear ring 6 and the top outer wall of the turntable 10 are respectively fixed with limiting frame 1 22 and limiting frame 25 by screws. The top of the limiting frame 1 22 has a limiting hole 23. The top of the limiting frame 25 has a limiting hole 24. The inner diameters of the limiting hole 1 23 and the limiting hole 24 are the same, and the outer diameter of the limiting pin 28 and the limiting hole 1 23 and the limiting hole 24 are compatible with each other. As the electric telescopic rod 31 drives the upper mold mechanism to move downward, the limiting pin 28 moves downward synchronously with the upper mold mechanism. Therefore, the bottom of the limiting pin 28 is inserted into the inner wall of the limiting hole 24, while the limiting pin 28 is disengaged from the limiting hole 23. At this time, the limiting hole 24, the limiting frame 25 and the limiting pin 28 limit the turntable 10 and the limiting seat 2 12. At the same time, the upper mold mechanism moves downward in coordination with the lower mold mechanism to limit the pot body and the heating film. Conversely, when the welding between the kettle body and the heating film is completed, and the limiting frame 22 and the limiting hole 23 move to their initial positions under the drive of the drive motor 16, the electric telescopic rod 31 drives the limiting pin 28 and the upper mold mechanism to move upward. The top of the limiting pin 28 gradually inserts into the inner wall of the limiting hole 23, while the bottom of the limiting pin 28 disengages from the limiting hole 24, thus completing the position exchange between the two feeding components.

[0029] The support rod 14 is fixed to the top outer wall of the base 1 by screws. The support rod 14 is welded to the outer circumference of the support rod 14 by a fixing plate 35. The surface of the fixing plate 35 is fixed with a welding head 36 by embedding. The drive shaft 20 is a hollow structure used to accommodate the support rod 14. During welding, the welding head 36 is connected to the welding equipment (not shown), and the welding head 36 is used to weld the connection between the rotating pot body and the heating film.

[0030] The top outer wall of the support rod 14 is fixed with a jet disc 39 by screws. A mating flange 40 is welded to the top outer wall of the jet disc 39. An exhaust pipe is installed on the side of the jet disc 39. The exhaust pipe includes a connecting pipe 34 welded to the side of the jet disc 39 and an adjusting pipe 37 slidably connected to its inner wall. A spring 11 is sleeved on the outer wall of the adjusting pipe 37. The two ends of the spring 11 are respectively fixed to one end of the connecting pipe 34 and the inner wall of one side of the adjusting pipe 37. An adjusting hole 38 is opened at the bottom of the adjusting pipe 37. An air blowing pipe 33 is welded to the bottom of the connecting pipe 34. When it is necessary to clean the weld slag at the weld between the kettle body and the heating film, the connecting flange 40 and the fan connecting pipe (not shown) are connected. In the initial state, the top of the adjusting hole 38 and the blowing pipe 33 are misaligned to prevent dust from entering the exhaust assembly and the inside of the jet plate 39. When the fan blows air into the jet plate 39 and the exhaust pipe, the spring 11 will deform and be stretched under the action of wind pressure. The adjusting pipe 37 slides relative to the inner wall of the connecting pipe 34, and the adjusting hole 38 will move to a position where there is a relative opening between it and the top of the blowing pipe 33. This allows the air force to act on the weld between the kettle body and the heating film through the adjusting hole 38 and the blowing pipe 33, and the weld slag at the weld is cleaned by blowing.

[0031] A controller 8 is mounted on the side of the base 1; Operators can use the control buttons on the controller 8 to control the start, stop and turn of the drive motor 16, the raising and lowering of the electric telescopic rod 31, and the coordinated work of the welding head 36 and the air jet disc 39, thereby realizing the automatic cycle of welding and slag removal processes.

[0032] Example 2:

[0033] A welding process for heating a thick film at the bottom of a kettle includes the following steps: S1: Start the controller 8 to control the electric telescopic rod 31 to move downward, drive the upper mold mechanism to press down, and the upper and lower mold mechanisms cooperate to complete the clamping and positioning of the workpiece. The limit pin 28 moves downward and inserts into the limit hole 24 of the limit frame 25 to lock the turntable 10 and the limit seat 2 12. S2: Drive motor 16 drives drive gear 19 to rotate, drive gear 19 drives driven gear 26 to rotate. Since turntable 10 is locked, driven gear 26 drives workpiece to rotate around driven shaft 32. During the uniform rotation of workpiece, welding equipment is started, and welding head 36 is used to continuously weld the joint. S3: After welding is completed, the electric telescopic rod 31 drives the upper mold mechanism and the limit pin 28 to move upward. The limit pin 28 is dislodged from the second limit hole 24 and inserted into the first limit hole 23 of the first limit frame 22, locking the gear ring 6 and the first limit seat 2. The drive motor 16 continues to work, driving the driven gear 26 to revolve around the fixed gear ring 6, driving the turntable 10 to rotate 180 degrees, realizing the interchange between the welding station and the slag removal station. S4: The workpiece located at the slag removal station rotates with its driven shaft 32. The airflow from the blower is turned on, which pushes the regulating pipe 37 to slide, so that the regulating hole 38 is connected to the air blowing pipe 33. Compressed air is sprayed out from the air blowing pipe 33, which blows the weld of the rotating workpiece to remove the weld slag.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A welding device for heating a thick film at the bottom of a kettle, comprising a base (1), characterized in that, The base (1) has a bracket (9) fixed on its top outer wall. Limiting seat one (2) and limiting seat two (12) are fixed between the two brackets (9). A gear ring (6) is movably connected to the inner circumference of the limiting seat one (2). A turntable (10) is movably connected to the inner circumference of the limiting seat two (12). The gear ring (6) and the turntable (10) are limited by a limiting mechanism. A feeding component is movably connected to the through hole on the surface of the turntable (10). A vertical plate (13) is fixed on the top outer wall of the base (1). A drive shaft (20) is movably connected to the through hole on the top of the vertical plate (13). The gear ring (6), the drive shaft (20) and the feeding component are driven by a gear transmission mechanism.

2. The welding device for heating a thick film at the bottom of a kettle according to claim 1, characterized in that, The feeding assembly includes a driven shaft (32) movably connected to the surface of the turntable (10) and a lower mold mechanism fixed to the top of the driven shaft (32). The lower mold mechanism includes a lower mold part (7) and a lower positioning part (21). The lower mold part (7) is fixed to the top of the driven shaft (32), and the lower positioning part (21) is integrally formed on the top of the lower mold part (7).

3. The welding device for heating a thick film at the bottom of a kettle according to claim 1, characterized in that, The gear transmission mechanism includes a driven gear (26) connected to the outer circumference of the driven shaft (32) by a key, the driven gear (26) meshing with the gear ring (6), and the gear transmission mechanism also includes a driving gear (19) connected to the outer circumference of the driving shaft (20) by a key and meshing with the driven gear (26).

4. The welding device for heating a thick film at the bottom of a kettle according to claim 1, characterized in that, An electric telescopic rod (31) is fixed to the top outer wall of the base (1). A pressure sensor (30) is fixed to the output end of the electric telescopic rod (31) by a pin. A connecting rod (3) is fixed to the top of the pressure sensor (30). A rotating shaft (4) is installed at the end of the connecting rod (3) away from the pressure sensor (30). An upper mold mechanism is movably connected to the bottom of the rotating shaft (4).

5. The welding device for heating a thick film at the bottom of a kettle according to claim 4, characterized in that, The upper mold mechanism includes an upper mold part (5) and an upper positioning part (27). The upper mold part (5) is fixed to the bottom of the rotating shaft (4), and the upper positioning part (27) is integrally formed on the bottom of the upper mold part (5).

6. The welding device for heating a thick film at the bottom of a kettle according to claim 1, characterized in that, The base (1) has a mounting bracket (17) fixed on the top outer wall, and a drive motor (16) is fixed on the top inner wall of the mounting bracket (17). The output end of the drive motor (16) and the outer circumference of the drive shaft (20) are both fixed with synchronous pulleys (18). The two synchronous pulleys (18) are driven by a synchronous belt (15). A controller (8) is installed on the side of the base (1).

7. The welding device for heating a thick film at the bottom of a kettle according to claim 1, characterized in that, The limiting mechanism includes an intermediate rod (29) welded to the side of the connecting rod (3), and a limiting pin (28) welded to one end of the intermediate rod (29). The limiting mechanism also includes a limiting frame one (22) and a limiting frame two (25) respectively fixed to the top outer wall of the gear ring (6) and the top outer wall of the turntable (10). The limiting frame one (22) has a limiting hole one (23) on its top, and the limiting frame two (25) has a limiting hole two (24) on its top.

8. The welding device for heating a thick film at the bottom of a kettle according to claim 7, characterized in that, The base (1) has a support rod (14) fixed on its top outer wall. The support rod (14) has a fixing plate (35) welded to its circumferential outer wall. The fixing plate (35) has a welding head (36) fixed on its surface by embedding.

9. The welding device for heating a thick film at the bottom of a kettle according to claim 8, characterized in that, The support rod (14) has a jet disc (39) fixed on its top outer wall. The jet disc (39) has a welding flange (40) welded to its top outer wall. The exhaust pipe installed on the side of the jet disc (39) includes a connecting pipe (34) welded to the side of the jet disc (39) and an adjusting pipe (37) movably connected to its inner wall. The spring (11) sleeved on the outer wall of the adjusting pipe (37) has its two ends fixed to one end of the connecting pipe (34) and the inner wall of one side of the adjusting pipe (37), respectively. The adjusting pipe (37) has an adjusting hole (38) at its bottom. The connecting pipe (34) has an air blowing pipe (33) welded to its bottom.

10. A welding process for heating a thick film at the bottom of a kettle, using the welding apparatus described in any one of claims 1-9, characterized in that... Includes the following steps: S1: Start the controller (8) to control the electric telescopic rod (31) to go down, drive the upper mold mechanism to press down, and the upper and lower mold mechanisms cooperate to complete the clamping and positioning of the workpiece. The limit pin (28) goes down and inserts into the limit hole (24) of the limit frame (25) to lock the turntable (10) and the limit seat (12). S2: The drive motor (16) drives the active gear (19) to rotate, and the active gear (19) drives the driven gear (26) to rotate. Since the turntable (10) is locked, the driven gear (26) drives the workpiece to rotate around the driven shaft (32). During the uniform rotation of the workpiece, the welding equipment is started, and the welding head (36) is used to continuously weld the connection. S3: After welding is completed, the electric telescopic rod (31) drives the upper mold mechanism and the limiting pin (28) to move upward. The limiting pin (28) is dislodged from the limiting hole two (24) and inserted into the limiting hole one (23) of the limiting frame one (22), locking the gear ring (6) and the limiting seat one (2). The drive motor (16) continues to work, driving the driven gear (26) to revolve around the fixed gear ring (6), driving the turntable (10) to rotate 180 degrees, realizing the interchange between the welding station and the slag removal station; S4: The workpiece located at the slag removal station rotates with its driven shaft (32). The airflow from the blower is turned on to push the regulating pipe (37) to slide, so that the regulating hole (38) is connected to the blowing pipe (33). Compressed air is sprayed out from the blowing pipe (33) to blow the weld of the rotating workpiece to remove the welding slag.

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