A pressure vessel head welding frame with centering structure

Abstract

The invention relates to the field of pressure vessel processing equipment, and proposes a pressure vessel head welding rack with a centering structure. The pressure vessel head welding rack with a centering structure comprises a working base, a container fixing component, a head fixing component and a synchronous welding component. The container fixing component comprises a clamping fixing seat fixedly connected to the top of the working base. The turntable is driven to rotate by a servo motor to realize automatic transfer of the head from the container fixing component to the head fixing component. In addition, the clamping motor drives the active wheel and the passive wheel to drive four clamping seats to move synchronously, thereby realizing stable clamping of the pressure vessel and improving work efficiency and clamping accuracy. Furthermore, the uniform arrangement of four heating components ensures the uniformity of the heating process and further improves the welding quality.

Description

Technical Field

[0001] The invention relates to the field of pressure vessel processing equipment, and in particular to a pressure vessel head welding frame with a centering structure. Background Art

[0002] Pressure vessels refer to closed equipment used to contain gas or liquid and bear a certain pressure. They are widely used. The head is the end cover on the pressure vessel and is also a major pressure-bearing component of the pressure vessel. There are many types of heads, including convex heads, cone shells, reducers, flat covers and tightening mouth designs, and different types of heads have different manufacturing methods due to their different models.

[0003] The authorization announcement in the prior art is: CN 115229416 A, and its name is: A pressure vessel head welding frame, which belongs to the technical field of pressure vessel processing equipment. The welding frame includes a base body, on which a moving assembly and a welding assembly are equipped. The moving assembly is designed with two sets of positioning assemblies that can move relatively. These positioning assemblies are composed of a moving plate, an end positioning unit and a bottom positioning unit. The moving plate is installed on the moving assembly, and the end positioning unit and the bottom positioning unit are respectively arranged on the opposite sides of the top of the moving plate. The core of this invention is that through the synergistic effect of the end positioning unit and the bottom positioning unit, the precise support and positioning of the semi-head can be achieved. In addition, a limit assembly is introduced to further improve the accuracy of positioning and ensure the firmness and stability of the supporting structure.

[0004] However, the patent uses a half head for welding, and after the welding of the half head is completed, the welded head still needs to be combined and welded, which is inefficient;

[0005] In addition, the automatic welding of the head in the prior art usually adopts the method of welding four points to preliminarily fix the head and the container body before moving it to the machine for final welding. The accuracy of welding using this method depends largely on the accuracy of manual preliminary welding, because the accuracy of manual welding may be inaccurate;

[0006] In addition, the welding in the prior art usually adopts single-sided welding, and it is impossible to weld the inner surface and the outer surface of the weld at the same time, and the welding effect is poor. Summary of the invention

[0007] The present invention provides a pressure vessel head welding frame with a centering structure, which solves the problems of low welding efficiency and poor welding accuracy in the related art.

[0008] The technical solution of the present invention is as follows:

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pressure vessel head welding frame with a centering structure, comprising a working base, a vessel fixing assembly, a head fixing assembly and a synchronous welding assembly, wherein the vessel fixing assembly comprises a clamping fixing seat fixedly connected to the top of the working base, the inside of the clamping fixing seat is fixedly connected with four limit blocks evenly distributed in a circular array, a slide groove is provided inside the limit block, a synchronous rod is slidably connected inside the slide groove, and the top of the synchronous rod is fixedly connected with a clamping seat;

[0010] The head fixing assembly includes a turntable installed on the top of the working top seat, the top of the turntable is fixedly connected to a column, a lifting threaded rod is rotatably installed inside the column, a lifting plate is threadedly connected to the outer circumference of the lifting threaded rod, one side of the lifting plate is fixedly connected to a fixing plate, the bottom of the fixing plate is fixedly connected to a positioning column, four electric rotating shafts uniformly distributed in an annular array are rotatably installed inside the positioning column near the bottom end, an auxiliary supporting shaft is fixedly sleeved on the outer circumference of the electric rotating shaft, four rotating arms 2 uniformly distributed in an annular array are rotatably installed inside the positioning column, one end of the auxiliary supporting shaft is movably hinged inside the rotating arm 2, and a positioning wheel 2 is rotatably installed inside the rotating arm 2;

[0011] The synchronous welding assembly includes a synchronous gear 1 rotatably mounted inside the fixed plate, the top of the synchronous gear 1 is fixedly connected to a motor mounting seat, the top of the motor mounting seat is installed with a welding motor, the output end of the welding motor is fixedly connected to a coaxially arranged rotating shaft through a coupling, the outer circumferential surface of the rotating shaft is fixedly sleeved with a lifting gear, the bottom of the synchronous gear 1 is fixedly connected to a rotating sleeve, the sleeve and the lifting gear are jointly provided with a through lifting groove, the lifting groove is slidably connected with a moving connecting rod, one side of the moving connecting rod is fixedly connected with a lifting rack, the lifting gear and the lifting rack are meshed and connected, the bottom of the moving connecting rod is fixedly connected with a connecting rod, the interior of the internal welding head is nested with an adjusting rotating shaft, the interior of the connecting rod is installed with an electric motor, and the adjusting rotating shaft is fixedly connected to the output end of the electric motor through a coupling.

[0012] Preferably, a clamping motor is installed inside the clamping fixing seat, and the output end of the clamping motor is fixedly connected to a coaxially arranged clamping shaft through a coupling, a driving wheel is fixedly sleeved on the outer circumference of the clamping shaft, a passive rotating shaft is rotatably installed inside the clamping fixing seat, a passive wheel is fixedly sleeved on the outer circumference of the passive rotating shaft, and the passive wheel is meshingly connected with the driving wheel;

[0013] The interior of the passive wheel is provided with four arc-shaped limit grooves evenly distributed in a circular array, the bottom of the synchronization rod is fixedly connected to the limit rod, and the limit rod is slidably connected to the interior of the limit groove. The setting of the limit groove can ensure that the limit rod set inside the limit groove moves the same distance during the rotation of the passive wheel, thereby ensuring that when clamping or releasing the pressure vessel body, the movement trajectories of the four clamping seats can be synchronized to avoid crushing of the container due to asynchrony.

[0014] Preferably, a heating component 1 is provided on the top of the clamping seat, and four heating components 1 are evenly distributed in a ring array;

[0015] A heating component 2 is installed on the top of the working base. A plurality of heating wires evenly distributed in a rectangular array are arranged inside the heating component 2. The arrangement of four heating components 1 can increase the heating area, preheat the temperature of the welding part in advance, reduce the temperature difference between various parts, and avoid deformation of the pressure vessel caused by excessive temperature difference.

[0016] Preferably, a servo motor is installed at the bottom of the turntable, the output end of the servo motor is fixedly connected to a coaxially arranged switching shaft through a coupling, and the turntable is sleeved on the outer circumference of the switching shaft;

[0017] A lifting motor is installed on the top of the column, and the output end of the lifting motor is fixedly connected to a coaxially arranged connecting rod through a coupling. The lifting threaded rod is sleeved on the outer circumferential surface of the connecting rod. A limited lifting groove is provided inside the column, and a part of the lifting plate is slidably connected to the inside of the limited lifting groove. A servo motor is used to drive the rotation of the entire head fixing assembly, which can ensure that the head fixing assembly can accurately reach the specified position each time it rotates, thereby ensuring the accuracy of subsequent welding.

[0018] Preferably, the interior of the positioning column is provided with four storage grooves evenly distributed in a circular array, a rotating arm shaft is rotatably installed inside the storage groove, a rotating arm 1 is fixedly sleeved on the outer circumference of the rotating arm shaft, a positioning wheel 1 is rotatably installed inside the rotating arm 1, and a limiting spring is fixedly connected between one side of the rotating arm 1 and the side wall of the storage groove;

[0019] Four symmetrically arranged inner support motors are installed inside the positioning column, and the auxiliary support shaft is fixedly connected to the output end of the inner support motor through a coupling;

[0020] The first positioning wheel and the second positioning wheel are both made of polyetheretherketone. Arranging four positioning wheels for internal support and fixing can reduce the risk that the clamping force may be concentrated on certain points outside the workpiece during external clamping and fixing, resulting in local stress concentration on the workpiece and increasing the risk of deformation;

[0021] In addition, the combination of internal support and top downward pressure can optimize the stress distribution inside the structure, making the stress more uniform and reasonable, which helps to reduce stress concentration and reduce the risk of structural damage due to excessive local stress;

[0022] Finally, the use of polyetheretherketone, a high-temperature resistant material, can ensure that the clamping effect will not deteriorate due to the increase in temperature during the preheating process.

[0023] Preferably, a fixed side plate is fixedly connected to the top of the fixed plate, a synchronous motor is installed on one side of the fixed side plate, an output end of the welding motor is fixedly connected to a coaxially arranged synchronous shaft through a coupling, a synchronous driving gear 1 and a synchronous driving gear 2 are fixedly sleeved on the outer circumference of the synchronous shaft, and the synchronous driving gear 1 is meshingly connected with the synchronous gear 1;

[0024] A synchronous gear 2 is rotatably installed inside the fixed plate, and the synchronous gear 2 is meshed with the synchronous driving gear 2. The bottom of the synchronous gear 2 is fixedly connected to an electric slide rail, and the bottom of the moving end of the electric slide rail is installed with an electric telescopic rod. The output end of the electric telescopic rod is fixedly connected to an external welding head. By arranging two welding heads to perform welding synchronously, the welding quality can be guaranteed while the welding efficiency is better guaranteed.

[0025] Preferably, a support block is fixedly connected to the top of the synchronous gear one, and the movable connecting rod is slidably connected to the inside of the support block. The setting of the support block can limit the maximum sliding limit of the movable connecting rod, thereby ensuring that the movable connecting rod moves in a preset direction and stroke.

[0026] Preferably, a controller is installed on the top of the working base, and the clamping motor, heating component 1, heating component 2, lifting motor, electric shaft, internal welding head, external welding head, electric slide rail and electric telescopic rod are all electrically connected to the controller.

[0027] The working principle and beneficial effects of the present invention are:

[0028] 1. The present invention preheats the head by heating the second heating component, which effectively prevents the head from being deformed due to subsequent direct welding and improves the welding quality and yield rate.

[0029] 2. The present invention drives the turntable to rotate by a servo motor to realize the automatic transfer of the head from the container fixing assembly to the head fixing assembly. In addition, the clamping motor drives the active wheel and the passive wheel to drive the four clamping seats to move synchronously, thereby realizing stable clamping of the pressure vessel, improving work efficiency and clamping accuracy. Furthermore, the uniform arrangement of the four heating components ensures the uniformity of the heating process and further improves the welding quality.

[0030] 3. The present invention drives the lifting threaded rod through the lifting motor to drive the lifting plate and the positioning column to move precisely, ensuring that the positioning column is aligned with the feed hole of the head. Under the action of the limit spring, the four positioning wheels press down the top of the head and slowly open, cooperating with the auxiliary support shaft driven by the internal support motor and the second positioning wheel to form a stable clamp for the head and ensure that the center of the head is concentric with the center of the positioning column, thereby improving the accuracy and stability of welding.

[0031] 4. The present invention uses an SDI welding head as a welding head, which can capture and transmit video signals of the welding process in real time. Workers control the start and stop of the welding motor through images, ensuring real-time monitoring and timely adjustment of welding quality.

[0032] 5. The present invention drives the synchronous shaft through a synchronous motor, and simultaneously drives the synchronous driving gear 1 and the synchronous driving gear 2 to rotate, thereby driving the internal welding head and the external welding head to rotate synchronously, thereby ensuring the stability and consistency of welding. Furthermore, the synchronous driving gear 1 and the synchronous driving gear 2 have the same number of teeth and module, ensuring the same rotation speed, further improving the accuracy and stability of welding.

[0033] 6. The entire welding process of the present invention is automated and precisely controlled, reducing manual intervention and errors, and improving welding efficiency and quality. The clamping seat and positioning wheel made of polyetheretherketone material can maintain a good shape at the preheating temperature without damaging the outer surface of the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 It is a partial structural schematic diagram of the present invention;

[0037] Figure 3 It is a schematic diagram of the structure of the head fixing assembly of the present invention;

[0038] Figure 4 It is a side sectional view of the head fixing assembly of the present invention;

[0039] Figure 5 It is a schematic diagram of the structure of the internal welding head of the present invention;

[0040] Figure 6 It is a schematic diagram of the structure of the synchronous motor of the present invention;

[0041] Figure 7 It is a schematic diagram of the structure of the container fixing assembly of the present invention;

[0042] Figure 8It is a schematic diagram of the container fixing assembly structure from another perspective of the present invention;

[0043] Fig. 9 It is a structural schematic diagram of the second heating component of the present invention.

[0044] In the figure: 1, working base; 2, container fixing assembly; 201, clamping fixing seat; 202, clamping motor; 203, driving wheel; 204, driven wheel; 205, limiting groove; 206, limiting rod; 207, synchronization rod; 208, limiting block; 209, clamping seat; 210, heating assembly 1; 211, heating assembly 2; 212, controller;

[0045] 3. Head fixing assembly; 301. Turntable; 302. Column; 303. Lifting motor; 304. Lifting threaded rod; 305. Lifting plate; 306. Fixing plate; 307. Positioning column; 308. Rotating arm 1; 309. Positioning wheel 1; 310. Rotating arm 2; 311. Auxiliary support shaft; 312. Electric rotating shaft; 313. Positioning wheel 2;

[0046] 4. Synchronous welding assembly; 401. Support block; 402. Synchronous gear 1; 403. Lifting gear; 404. Moving connecting rod; 405. Connecting rod; 406. Internal welding head; 407. Adjusting shaft; 408. Synchronous motor; 409. Synchronous shaft; 410. Synchronous driving gear 1; 411. Synchronous driving gear 2; 412. Synchronous gear 2; 413. Electric slide rail; 414. Electric telescopic rod; 415. External welding head; 416. Welding motor; 417. Rotating sleeve; 418. Electric motor. DETAILED DESCRIPTION

[0047] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0048] Example 1: Figure 1 to Figure 9 As shown, this embodiment proposes a pressure vessel head welding frame with a centering structure, including a working base 1, a container fixing assembly 2, a head fixing assembly 3 and a synchronous welding assembly 4. The container fixing assembly 2 includes a clamping fixing seat 201 fixedly connected to the top of the working base 1, and the interior of the clamping fixing seat 201 is fixedly connected with four limit blocks 208 evenly distributed in a circular array, and the interior of the limit block 208 is provided with a slide groove, and the interior of the slide groove is slidably connected with a synchronous rod 207, and the top of the synchronous rod 207 is fixedly connected with a clamping seat 209.

[0049] like Figure 1 to Figure 9 As shown, a clamping motor 202 is installed inside the clamping fixed seat 201, and the output end of the clamping motor 202 is fixedly connected to a coaxially arranged clamping shaft through a coupling, and a driving wheel 203 is fixedly sleeved on the outer circumference of the clamping shaft, and a passive shaft is rotatably installed inside the clamping fixed seat 201, and a passive wheel 204 is fixedly sleeved on the outer circumference of the passive shaft, and the passive wheel 204 is meshingly connected with the driving wheel 203;

[0050] Four arc-shaped limit grooves 205 evenly distributed in a circular array are opened inside the passive wheel 204, and the bottom of the synchronization rod 207 is fixedly connected to the limit rod 206, and the limit rod 206 is slidably connected inside the limit groove 205. The setting of the limit groove 205 can ensure that the limit rod 206 set inside the limit groove 205 moves the same distance during the rotation of the passive wheel 204, thereby ensuring that when clamping or releasing the pressure vessel body, the movement trajectories of the four clamping seats 209 can be synchronized to avoid crushing of the container due to asynchrony.

[0051] like Figure 1 to Figure 9 As shown, a heating component 210 is disposed on the top of the clamping seat 209, and four heating components 210 are distributed in a ring array;

[0052] A heating component 211 is installed on the top of the working base 1. A plurality of heating wires evenly distributed in a rectangular array are arranged inside the heating component 211. The arrangement of four heating components 1 210 can increase the heating area, preheat the temperature of the welding part in advance, reduce the temperature difference between various parts, and avoid deformation of the pressure vessel caused by excessive temperature difference.

[0053] like Figure 1 to Figure 9 As shown, a controller 212 is installed on the top of the working base 1, and the clamping motor 202, heating component 1 210, heating component 2 211, lifting motor 303, electric shaft 312, internal welding head 406, external welding head 415, electric slide rail 413 and electric telescopic rod 414 are all electrically connected to the controller 212.

[0054] Embodiment 2: This embodiment provides a pressure vessel head welding frame with a centering structure, which further includes the following structure based on Embodiment 1:

[0055] like Figure 1 to Figure 9As shown, this embodiment proposes a pressure vessel head welding frame with a centering structure, including a head fixing assembly 3 including a turntable 301 installed on the top of a working top seat, a column 302 is fixedly connected to the top of the turntable 301, a lifting threaded rod 304 is rotatably installed inside the column 302, a lifting plate 305 is threadedly connected to the outer circumference of the lifting threaded rod 304, a fixing plate 306 is fixedly connected to one side of the lifting plate 305, a positioning column 307 is fixedly connected to the bottom of the fixing plate 306, four electric rotating shafts 312 evenly distributed in an annular array are rotatably installed inside the positioning column 307 near the bottom end, an auxiliary support shaft 311 is fixedly sleeved on the outer circumference of the electric rotating shaft 312, four rotating arms 310 evenly distributed in an annular array are rotatably installed inside the positioning column 307, one end of the auxiliary support shaft 311 is movably hinged inside the rotating arm 310, and a positioning wheel 313 is rotatably installed inside the rotating arm 310;

[0056] like Figure 1 to Figure 9 As shown, a servo motor is installed at the bottom of the turntable 301, and the output end of the servo motor is fixedly connected to a coaxially arranged switching shaft through a coupling, and the turntable 301 is sleeved on the outer circumference of the switching shaft;

[0057] A lifting motor 303 is installed on the top of the column 302. The output end of the lifting motor 303 is fixedly connected to a coaxially arranged connecting rod through a coupling. The lifting threaded rod 304 is sleeved on the outer circumference of the connecting rod. A limited lifting groove is opened inside the column 302. Part of the lifting plate 305 is slidably connected inside the limited lifting groove. A servo motor is used to drive the rotation of the entire head fixing assembly 3, which can ensure that the head fixing assembly 3 can accurately reach the specified position each time it rotates, so as to ensure the accuracy of subsequent welding.

[0058] like Figure 1 to Figure 9 As shown, the interior of the positioning column 307 is provided with four storage grooves evenly distributed in a circular array, a rotating arm shaft is rotatably installed inside the storage groove, a rotating arm 308 is fixedly sleeved on the outer circumference of the rotating arm shaft, a positioning wheel 309 is rotatably installed inside the rotating arm 308, and a limiting spring is fixedly connected between one side of the rotating arm 308 and the side wall of the storage groove;

[0059] Four symmetrically arranged internal support motors are installed inside the positioning column 307, and the auxiliary support shaft 311 is fixedly connected to the output end of the internal support motor through a coupling;

[0060] The first positioning wheel 309 and the second positioning wheel 313 are both made of polyetheretherketone. The four first positioning wheels 309 are provided for internal support and fixing to reduce the possibility that the clamping force is concentrated on certain points outside the workpiece during external clamping and fixing, resulting in local stress concentration on the workpiece, thereby increasing the risk of deformation.

[0061] In addition, the combination of internal support and top downward pressure can optimize the stress distribution inside the structure, making the stress more uniform and reasonable, which helps to reduce stress concentration and reduce the risk of structural damage due to excessive local stress;

[0062] Finally, the use of polyetheretherketone, a high-temperature resistant material, can ensure that the clamping effect will not deteriorate due to the increase in temperature during the preheating process.

[0063] Embodiment 3: This embodiment provides a pressure vessel head welding frame with a centering structure, which further includes the following structure based on Embodiments 1 and 2:

[0064] like Figure 1 to Figure 9 As shown, this embodiment proposes a pressure vessel head welding frame with a centering structure, including a synchronous welding assembly 4 including a synchronous gear 402 rotatably mounted inside a fixed plate 306, a motor mounting seat fixedly connected to the top of the synchronous gear 402, a welding motor 416 installed on the top of the motor mounting seat, an output end of the welding motor 416 is fixedly connected to a coaxially arranged rotating shaft through a coupling, a lifting gear 403 is fixedly sleeved on the outer circumference of the rotating shaft, and a rotating sleeve 417 is fixedly connected to the bottom of the synchronous gear 402 The sleeve and the lifting gear 403 are jointly provided with a through lifting groove, the lifting groove is slidably connected with a moving connecting rod 404, one side of the moving connecting rod 404 is fixedly connected with a lifting rack, the lifting gear 403 and the lifting rack are meshingly connected, the bottom of the moving connecting rod 404 is fixedly connected with a connecting rod 405, the internal welding head 406 is nested with an adjusting shaft 407, the connecting rod 405 is installed with an electric motor 418, and the adjusting shaft 407 is fixedly connected to the output end of the electric motor 418 through a coupling.

[0065] like Figure 1 to Figure 9 As shown, the top of the fixed plate 306 is fixedly connected to a fixed side plate, one side of the fixed side plate is installed with a synchronous motor 408, the output end of the welding motor 416 is fixedly connected to a coaxially arranged synchronous shaft 409 through a coupling, and a synchronous driving gear 1 410 and a synchronous driving gear 2 411 are fixedly sleeved on the outer circumference of the synchronous shaft 409, respectively, and the synchronous driving gear 1 410 is meshedly connected with the synchronous gear 1 402;

[0066] The fixed plate 306 is internally rotatably installed with a synchronous gear 2 412, which is meshed with the synchronous driving gear 2 411. The bottom of the synchronous gear 2 412 is fixedly connected with an electric slide rail 413, and the bottom of the moving end of the electric slide rail 413 is installed with an electric telescopic rod 414. The output end of the electric telescopic rod 414 is fixedly connected with an external welding head 415. By arranging two welding heads for synchronous welding, the welding quality can be guaranteed under the premise of better guaranteeing the welding efficiency.

[0067] like Figure 1 to Figure 9 As shown, the top of the synchronous gear 402 is fixedly connected to a support block 401, and the moving link 404 is slidably connected to the inside of the support block 401. The setting of the support block 401 can limit the maximum sliding limit of the moving link 404, ensuring that the moving link 404 moves in a preset direction and stroke.

[0068] Working principle: first, place the end cap with the feed hole inside the second heating component 211, and the second heating component 211 is provided with a groove matching the size of the end cap. After the placement is completed, start the second heating component 211, and the heating component will preheat the end cap through the electric heating wire provided inside to prevent the end cap from being deformed due to subsequent direct welding.

[0069] After the placement of the head is completed, the servo motor arranged at the bottom of the turntable 301 is started, and the servo motor starts to drive the turntable 301 to rotate 90° clockwise, and the fixing plate 306 is moved from the top of the container fixing component 2 to the top of the head fixing component 3, and then the clamping motor 202 is started, and the clamping motor 202 drives the driving wheel 203 to rotate, and the driving wheel 203 drives the passive wheel 204 to rotate, and the rotation of the passive wheel 204 will drive the four synchronous rods 207 to move outward along the direction of the limit groove 205, thereby driving the four clamping seats 209 to move outward at the same time. At this time, the bottom of the pressure vessel can be placed in the middle of the four clamping seats 209 by hoisting or other methods, and the clamping motor 202 is started in reverse phase at the same time. 02, the clamping motor 202 will drive the passive wheel 204 to rotate in the reverse direction, and finally realize that the four clamping seats 209 move synchronously to the middle to clamp and fix the pressure vessel. It should be noted that the top shape of the clamping seat 209 matches the shape of the bottom of the pressure vessel, which is used to fix the pressure vessel well. In addition, the clamping seat 209 is made of polyetheretherketone material with strong heat resistance, and can maintain a good shape at the preheating temperature without damaging the outer surface of the container during the clamping process. After completing the clamping, the thermal component 1 is started to preheat the area near the welding point. The setting of the four heating components 210 can ensure uniform heating during the heating process;

[0070] After the heating reaches the preset time, the lifting motor 303 is started, and the lifting motor 303 will drive the lifting threaded rod 304 to rotate. The rotation of the lifting threaded rod 304 will drive the lifting plate 305 to move downward along the release direction of the lifting threaded rod 304 until the positioning column 307 enters the inside of the feed hole of the head. The four positioning wheels 309 will press down the top of the head under the action of the limit spring and slowly open. After the descent is completed, the four internal support motors are started synchronously. The internal support motors will simultaneously drive the auxiliary support shaft 311 to rotate counterclockwise under the action of the electric rotating shaft 312 The needle rotates and pushes upward, thereby driving the four rotating shafts 2 to rotate counterclockwise upward at the same time, so that the four positioning wheels 2 313 push the inner surface of the head upward at the same time, and form a clamping effect with the positioning wheel 1 309. Because the four rotating shafts 2 rotate synchronously, it can be ensured that the center of the head and the center of the positioning column 307 are concentric. It should be noted that the positioning wheel 2 313 and the positioning wheel 1 309 are also made of polyetheretherketone material with strong heat resistance, and can maintain a good shape at the preheating temperature without damaging the outer surface of the container during the clamping process;

[0071] After the end cap is clamped, the end cap is first moved to the top of the column 302 by starting the lifting motor 303, and the turntable 301 is driven to rotate 90° counterclockwise by starting the servo motor again to move the end cap onto the pressure vessel. At this time, because the center of the positioning column 307 is concentric with the center of the clamping fixing seat 201, the end cap and the pressure vessel are also aligned.

[0072] After the alignment is completed, the end cap is moved downward by starting the lifting motor 303 until the distance between the end cap and the pressure vessel meets the welding requirements, and then the welding motor 416 is started. The welding motor 416 drives the lifting gear 403 to rotate, and the lifting gear 403 drives the moving wheel connecting rod meshing with it to move downward, and the moving connecting rod 404 moves downward while driving the internal welding head 406 to move downward until the internal welding head 406 is completely moved out of the rotating sleeve 417. The electric motor 418 starts to drive the internal welding head 406 to rotate until the internal welding head 406 rotates to a suitable position. The welding motor 416 starts and stops according to the image transmitted back by the camera assembly set at the end of the internal welding head 406 to control the alignment position of the internal welding head 406 to ensure that the welding head is in a suitable position. It should be noted that the welding head can be selected as an SDI welding head, which can capture and transmit video signals of the welding process in real time to ensure real-time monitoring of welding quality. The worker controls the start and stop of the welding motor 416 through the image;

[0073] After the positioning of the internal welding head 406 is completed, the relative position of the external welding head 415 is controlled by starting the electric slide rail 413 and the electric telescopic rod 414, and the welding operation can be started after moving to the relative position;

[0074] At this time, the synchronous motor 408 is started, and the synchronous motor 408 drives the synchronous driving gear 1 410 and the synchronous driving gear 2 411 to rotate through the synchronous shaft 409. The synchronous driving gear 1 410 and the synchronous driving gear 2 411 rotate to drive the synchronous gear 1 402 and the synchronous gear 2 412 to rotate. The synchronous gear 2 412 drives the external welding head 415 to rotate by driving the electric slide rail 413. The second synchronous gear 1 402 directly drives the internal welding head 406 to rotate by driving the rotating sleeve 417. Because the synchronous driving gear 1 410 and the synchronous driving gear 2 411 have the same number of teeth and module, the rotation speed is also the same, thereby achieving the effect of synchronous rotation and ensuring welding stability. After the driving gear rotates one circle, the welding of the head and the pressure vessel is completed.

[0075] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. 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 pressure vessel head welding frame with a centering structure, comprising a working base (1), a vessel fixing assembly (2), a head fixing assembly (3) and a synchronous welding assembly (4), characterized in that: The container fixing assembly (2) comprises a clamping fixing seat (201) fixedly connected to the top of the working base (1); four limiting blocks (208) evenly distributed in a ring array are fixedly connected inside the clamping fixing seat (201); a sliding groove is provided inside the limiting block (208); a synchronous rod (207) is slidably connected inside the sliding groove; and a clamping seat (209) is fixedly connected to the top of the synchronous rod (207); The end cap fixing assembly (3) comprises a turntable (301) mounted on the top of the working top seat, the top of the turntable (301) is fixedly connected to a column (302), a lifting threaded rod (304) is rotatably mounted inside the column (302), a lifting plate (305) is threadedly connected to the outer circumference of the lifting threaded rod (304), one side of the lifting plate (305) is fixedly connected to a fixing plate (306), and the bottom of the fixing plate (306) is fixedly connected to a positioning column (307). The positioning column (307) is internally rotatably mounted near the bottom end thereof with four electric rotating shafts (312) evenly distributed in a circular array, an auxiliary supporting shaft (311) is fixedly sleeved on the outer circumference of the electric rotating shaft (312), and the positioning column (307) is internally rotatably mounted with four rotating arms (310) evenly distributed in a circular array, one end of the auxiliary supporting shaft (311) is movably hinged inside the rotating arm (310), and a positioning wheel (313) is internally rotatably mounted on the rotating arm (310); The interior of the positioning column (307) is provided with four storage grooves evenly distributed in a circular array, a rotating arm shaft is rotatably mounted inside the storage groove, a rotating arm 1 (308) is fixedly sleeved on the outer circumference of the rotating arm shaft, a positioning wheel 1 (309) is rotatably mounted inside the rotating arm 1 (308), and a limiting spring is fixedly connected between one side of the rotating arm 1 (308) and the side wall of the storage groove; Four symmetrically arranged internal support motors are installed inside the positioning column (307), and the auxiliary support shaft (311) is fixedly connected to the output end of the internal support motor via a coupling; The first positioning wheel (309) and the second positioning wheel (313) are both made of polyetheretherketone; The synchronous welding assembly (4) comprises a synchronous gear 1 (402) rotatably mounted inside the fixed plate (306); the top of the synchronous gear 1 (402) is fixedly connected to a motor mounting seat; the top of the motor mounting seat is mounted with a welding motor (416); the output end of the welding motor (416) is fixedly connected to a coaxially arranged rotating shaft via a coupling; a lifting gear (403) is fixedly sleeved on the outer circumference of the rotating shaft; the bottom of the synchronous gear 1 (402) is fixedly connected to a rotating sleeve (417); the sleeve and the lifting gear (403) are both provided with a through lifting groove; the lifting groove is slidably connected to a moving connecting rod (404); one side of the moving connecting rod (404) is fixedly connected to a lifting rack; the lifting gear (403) and the lifting rack are fixedly sleeved on the outer circumference of the rotating shaft; The movable connecting rod (404) is meshedly connected with a connecting rod (405) at the bottom, an adjusting shaft (407) is nested in the internal welding head (406), an electric motor (418) is installed inside the connecting rod (405), and the adjusting shaft (407) is fixedly connected to the output end of the electric motor (418) through a coupling, until the internal welding head (406) is completely moved out of the rotating sleeve (417), the electric motor (418) will start to drive the internal welding head (406) to rotate, until the internal welding head (406) rotates to a suitable position, the welding motor (416) will start and stop according to the image transmitted back by the camera assembly arranged at the end of the internal welding head (406), so as to control the alignment position of the internal welding head (406) to ensure that the welding head is in a suitable position; The top of the fixed plate (306) is fixedly connected to a fixed side plate, one side of the fixed side plate is mounted with a synchronous motor (408), the output end of the welding motor (416) is fixedly connected to a coaxially arranged synchronous shaft (409) via a coupling, the outer circumference of the synchronous shaft (409) is respectively fixedly sleeved with a synchronous driving gear 1 (410) and a synchronous driving gear 2 (411), the synchronous driving gear 1 (410) and the synchronous gear 1 (402) being meshingly connected; A second synchronous gear (412) is rotatably mounted inside the fixed plate (306); the second synchronous gear (412) is meshingly connected to the second synchronous driving gear (411); an electric slide rail (413) is fixedly connected to the bottom of the second synchronous gear (412); an electric telescopic rod (414) is mounted at the bottom of the moving end of the electric slide rail (413); and an external welding head (415) is fixedly connected to the output end of the electric telescopic rod (414).

2. The pressure vessel head welding frame with a centering structure according to claim 1, characterized in that: A clamping motor (202) is installed inside the clamping seat (201); the output end of the clamping motor (202) is fixedly connected to a coaxially arranged clamping shaft via a coupling; a driving wheel (203) is fixedly sleeved on the outer circumference of the clamping shaft; a passive rotating shaft is rotatably installed inside the clamping seat (201); a passive wheel (204) is fixedly sleeved on the outer circumference of the passive rotating shaft; the passive wheel (204) is meshingly connected to the driving wheel (203); Four arc-shaped limiting grooves (205) evenly distributed in a ring array are provided inside the passive wheel (204); the bottom of the synchronization rod (207) is fixedly connected to a limiting rod (206); and the limiting rod (206) is slidably connected to the inside of the limiting groove (205).

3. The pressure vessel head welding frame with a centering structure according to claim 2, characterized in that: A heating component one (210) is disposed on the top of the clamping seat (209), and four heating components one (210) are evenly distributed in a ring array; A second heating component (211) is installed on the top of the working base (1), and a plurality of heating wires distributed in a rectangular array are arranged inside the second heating component (211).

4. The pressure vessel head welding frame with a centering structure according to claim 3, characterized in that: A servo motor is installed at the bottom of the rotating disk (301); an output end of the servo motor is fixedly connected to a coaxially arranged switching shaft via a coupling; and the rotating disk (301) is sleeved on the outer peripheral surface of the switching shaft; A lifting motor (303) is installed on the top of the column (302); the output end of the lifting motor (303) is fixedly connected to a coaxially arranged connecting rod via a coupling; the lifting threaded rod (304) is sleeved on the outer circumference of the connecting rod; a limited lifting groove is provided inside the column (302); and a portion of the lifting plate (305) is slidably connected to the inside of the limited lifting groove.

5. The pressure vessel head welding frame with a centering structure according to claim 4, characterized in that: The top of the synchronous gear 1 (402) is fixedly connected to a support block (401), and the movable connecting rod (404) is slidably connected inside the support block (401).

6. The pressure vessel head welding frame with a centering structure according to claim 5, characterized in that: A controller (212) is installed on the top of the working base (1); the clamping motor (202), heating component one (210), heating component two (211), lifting motor (303), electric rotating shaft (312), internal welding head (406), external welding head (415), electric slide rail (413) and electric telescopic rod (414) are all electrically connected to the controller (212).

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