Girth welding machine for accessories in tank

Abstract

The invention relates to the technical field of pressure vessel welding, one embodiment of the invention provides a girth welding machine for accessories in a tank, the girth welding machine is used for welding the pressure vessel and the accessories, the accessories are positioned on the inner wall of the pressure vessel in advance through spot welding, the girth welding machine comprises two sets of supporting rollers, the rotary support is provided for the pressure container; and the welding arm is arranged on one side of the supporting roller, and the welding arm extends into the pressure container. According to the device, the supporting roller rotates and drives the pressure container to rotate, the supporting wheel and the pressing wheel are used for being in rolling abutting connection with the rotating pressure container and the accessory correspondingly, so that the welding head can synchronously weld welding seams of the pressure container and the accessory in the rotating process, and automation of welding and positioning work before welding of the device is achieved through the design; the labor cost is greatly reduced, the safety and health of staff are effectively guaranteed, and the welding efficiency of the device is greatly improved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of pressure vessel welding technology, and more specifically, to a circumferential welder for internal tank fittings. Background Technology

[0002] In the manufacturing sector, especially in the special vehicle production industry, the welding process for internal accessories of single-layer pressure vessel tanks has always been one of the key factors restricting production efficiency and product quality; traditionally, this welding process is highly dependent on manual operation and has many limitations.

[0003] I. Limitations of Manual Welding Labor-intensive production: In existing technologies, welding of internal accessories of single-layer tanks in pressure vessels often requires workers to crawl into the tank for manual welding.

[0004] This process is not only physically demanding, but also has a serious impact on the working environment and health of employees due to the confined space and poor air quality inside the tank.

[0005] In addition, the lack of a stable welding team makes it difficult to achieve the required welding results, leading to inconsistent product quality.

[0006] Low efficiency: Existing tank circumferential welded equipment often requires 4-5 people to complete the welding operation, which not only increases labor costs but also limits the improvement of production efficiency.

[0007] In today's increasingly competitive market, this inefficient production method can no longer meet the needs of enterprises' rapid development.

[0008] Unstable quality: Manual welding is affected by various factors such as the operator's skill level and fatigue level, resulting in unstable welding quality and making it difficult to meet the standardization and uniformity requirements of product quality.

[0009] This not only affects the overall performance of the product, but may also cause safety hazards.

[0010] II. Trends in Automation and Intelligence With the increasingly significant trend of automation and intelligent development in my country's manufacturing market, automated production lines have demonstrated tremendous advantages in reducing labor costs, improving production efficiency, and ensuring product quality stability.

[0011] In the field of special-purpose vehicles, although the proportion of participation in automated and intelligent production is relatively low, accelerating the research and development of intelligent and automated production lines has become the key for enterprises to enhance their competitiveness.

[0012] To address the aforementioned issues, the "Girdle Welding Machine for Internal Tank Accessories" was developed. This invention aims to automate and intelligently upgrade the welding production line for internal accessories of single-layer pressure vessel tanks by improving existing processes. Specifically, the invention uses a lifting device to raise the tank to a designated position, allowing the welding arm to directly enter the tank for laser positioning and automatic welding. This eliminates the need for employees to crawl into the tank, improves the working environment, and protects the health and safety of employees. Furthermore, the use of this new equipment significantly improves welding efficiency and quality stability, achieving a shift from a labor-intensive to a technology-intensive process. Summary of the Invention

[0013] To overcome the above-mentioned defects, the embodiments of this disclosure provide a circumferential welder for tank accessories, which solves the technical problems of inefficiency and harm to workers caused by the reliance on manual labor for welding tank accessories in related technologies.

[0014] This invention discloses a circumferential welder for internal fittings, used for welding pressure vessels and fittings, wherein the fittings are pre-positioned on the inner wall of the pressure vessel by spot welding, comprising: Support rollers, wherein two sets of support rollers are provided to provide rotational support for the pressure vessel; A welding arm is positioned on one side of a supporting roller and extends into the interior of a pressure vessel. A support plate 1 is slidably mounted on the front of the welding arm. A cylinder is fixedly mounted on the top of the front of the support plate 1. A fixed plate slidably mounted on the front of the support plate 1 is fixedly connected to the telescopic end of the cylinder. Slider blocks and support plates 2 are slidably mounted on the left and right sides of the front of the fixed plate. A linear motor 2 is fixedly mounted on the front of the support plate 2. A linear motor 1 is slidably mounted on the front of the linear motor 2. A support plate is slidably mounted on the front of the linear motor 1. A welding head is installed inside the support plate. A connecting frame is fixedly connected to the bottom of the support plate 2. A pressure roller is movably sleeved on the bottom of the connecting frame. A support wheel is fixedly mounted on the back of the fixed plate. A fixing mechanism connects the two sets of support plates 2.

[0015] Preferably, the fixing mechanism includes a fixing column fixedly installed in the center of the front side of the support plate, a turntable rotatably installed on the outer surface of the fixing column, two sets of locking pins fixedly connected to the front side of the turntable, the fixing mechanism also includes an adapter rod fixedly connected to the inner side of the slider, a connecting rod hinged to one end of the adapter rod, one end of the connecting rod movably connected to the locking pin, a gear fixedly installed on the outer surface of the turntable, and a power motor fixedly installed on the top of the fixing plate, the output shaft of the power motor fixedly connected to a worm gear, the worm gear rotatably installed on the top of the front side of the fixing plate, and the worm gear meshing with the gear.

[0016] Preferably, the two sets of locking pins are circumferentially distributed on the front of the turntable, and the two sets of sliders achieve synchronous reverse movement through a fixing mechanism.

[0017] Preferably, a rotating column is movably sleeved on the bottom of the front side of the support plate, the welding head is fixedly installed on the rear end of the rotating column, multiple sets of slots are opened on the bottom of the back side of the support plate, a limiting ring located on the rear side of the support plate is fixedly installed on the outer surface of the rotating column, multiple sets of fixing strips adapted to the slots are fixedly connected to the front side of the limiting ring, the fixing strips are adapted to be engaged in the slots, a spring and an adapter ring located in front of the support plate are movably sleeved on the outer surface of the rotating column, the front end of the adapter ring abuts against the front end of the rotating column, and the two ends of the spring are elastically connected to the support plate and the adapter ring respectively.

[0018] Preferably, the spring is compressed and disposed on the front side of the support plate, the axial cross-section of the rotating column is "T" shaped, and the front end of the adapter ring abuts against the inner side of the protrusion of the rotating column.

[0019] Preferably, the support wheel is used to abut against the inner wall of the pressure vessel, the pressure wheel is used to press the surface of the accessory, the support wheel rolls against the inner wall of the pressure vessel, and the axis of the pressure wheel is perpendicular to the axis of the pressure vessel.

[0020] Preferably, the left and right sets of welding heads have the same tilt angle and are symmetrically distributed with the axis of the cylinder extension end as the reference.

[0021] Preferably, the number of slots is at least 40, and they are distributed equidistantly around the outer surface of the rotating column.

[0022] Preferably, the welding head is higher than the connecting frame and the pressure roller, and the welding head and the pressure roller are distributed in a staggered manner.

[0023] Preferably, the axis of the support wheel is parallel to the axis of the pressure vessel, and the support wheel is located on the right side of the back of the fixed plate.

[0024] The beneficial effects of the embodiments disclosed herein are as follows: 1. This redesigned device significantly reduces labor costs and achieves full automation in the welding process of pressure vessels and accessories. To achieve this, the device features a welding arm that extends into the pressure vessel, allowing a support plate to slide horizontally along its surface. Then, a cylinder on the front of the support plate drives a fixed plate to move vertically. The fixed plate is equipped with support wheels and two sets of sliders that rotate and abut against the bottom of the pressure vessel's inner wall. A second support plate, mounted on the front of the second support plate, uses a linear motor to drive the support plate and welding head downwards, allowing the welding head to pass through... By adjusting the height to accommodate the welding angle of the pressure vessel and accessories, and simultaneously using a cylinder to drive the fixed plate downwards, the support plate, connecting frame, and pressure rollers press the accessories downwards, thus achieving the pre-welding clamping operation of the accessories. Through the rotation of the support rollers, the pressure vessel rotates, and the support rollers and pressure rollers roll and abut against the rotating pressure vessel and accessories respectively, enabling the welding head to synchronously weld the welds of the pressure vessel and accessories while they are rotating. This design automates the welding and pre-welding positioning work of the device, greatly reducing labor costs, effectively ensuring the safety and health of employees, and significantly improving the welding efficiency of the device.

[0025] 2. This device achieves automatic adjustment of the distance between the two sets of pressure rollers and welding heads through a fixed mechanism. A turntable located on the front of the fixed plate drives the connecting rod to rotate, thereby enabling the two sets of sliders to move synchronously in opposite directions through the movement of the crank structure. This allows for efficient adjustment of the distance between the two sets of pressure rollers and welding heads. A power motor and worm gear located on the top of the fixed plate drive the gear and turntable to rotate. The unidirectional transmission between the worm gear and gear enables the slider to self-lock after adjustment, effectively improving the stability of the device.

[0026] 3. This device also optimizes the angle adjustment of the welding head. The welding head is installed using a rotating column. A limiting ring and a fixing strip are fixedly installed on the outer surface of the rotating column, located on the rear side of the support plate. The fixing strip can be locked into the slot, limiting the angle adjustment of the rotating column and the welding head. Then, a spring and an adapter ring are sleeved on the outer surface of the rotating column, located on the front side of the support plate. Pushing the rotating column and the limiting ring forward makes the fixing strip firmly locked into the slot, thus fixing the welding head. When it is necessary to adjust the angle of the welding head, simply press the rotating column one after the other, which will drive the limiting ring and the fixing strip out of the slot. After rotating the rotating column to adjust the angle of the welding head, the spring will drive the fixing strip to reset, thus re-fixing the welding head. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0028] Figure 1 This is a three-dimensional sectional view of the overall structure of the present invention; Figure 2 This is a partial front view of the overall structure of the present invention; Figure 3 This is a front view diagram of the overall structure of the present invention; Figure 4 This is a side view of the overall structure of the present invention; Figure 5 This is a schematic diagram of the structure of support plate one, cylinder, fixing plate, fixing mechanism, slider and support plate two of the present invention; Figure 6 This is a side sectional view of the support plate, rotating column, welding head, support wheel, limiting ring, fixing strip, adapter ring and spring of the present invention; Figure 7 This is a schematic diagram showing the separation of the support plate, rotating column, limiting ring, fixing strip, adapter ring and spring of the present invention; Figure 8 This is a schematic diagram of the structure of the cylinder, fixing plate, fixing mechanism and slider of the present invention.

[0029] The components include: 1. Support roller; 2. Welding arm; 3. Pressure vessel; 4. Accessory; 5. Support plate one; 6. Cylinder; 7. Fixing plate; 8. Fixing mechanism; 81. Fixing column; 82. Turntable; 83. Locking column; 84. Connecting rod; 85. Power motor; 86. Worm gear; 87. Gear; 88. Adapter rod; 9. Slider; 10. Support plate two; 11. Linear motor one; 12. Connecting frame; 13. Pressure roller; 14. Linear motor two; 15. Support plate; 16. Rotating column; 17. Welding head; 18. Support wheel; 19. Limiting ring; 20. Slot; 21. Fixing strip; 22. Adapter ring; 23. Spring. Detailed Implementation

[0030] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0031] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0032] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0033] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0035] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] like Figures 1-8 As shown, it illustrates the circumferential welder for internal fittings of this disclosure, used for welding pressure vessel 3 and fitting 4, fitting 4 being pre-positioned on the inner wall of pressure vessel 3 by spot welding, comprising: Support roller 1, two sets of support roller 1 are provided to provide rotational support for pressure vessel 3; Welding arm 2 is located on one side of support roller 1 and extends into the interior of pressure vessel 3. Support plate 1 5 is slidably mounted on the front of welding arm 2. Cylinder 6 is fixedly mounted on the top of the front of support plate 1 5. Fixed plate 7, which is slidably mounted on the front of support plate 1 5, is fixedly connected to the telescopic end of cylinder 6. Sliding slider 9 and support plate 2 10 are slidably mounted on the left and right sides of the front of fixed plate 7. Linear motor 2 14 is fixedly mounted on the front of support plate 2 10. Linear motor 11 is slidably mounted on the front of linear motor 2 14. Support plate 15 is slidably mounted on the front of linear motor 11. Welding head 17 is installed inside support plate 15. Connecting frame 12 is fixedly connected to the bottom of support plate 2 10. Pressure roller 13 is movably sleeved on the bottom of connecting frame 12. Support wheel 18 is fixedly mounted on the back of fixed plate 7. Fixed mechanism 8 is connected between the two sets of support plates 2 10. This redesigned device significantly reduces labor costs and achieves full automation in the welding process of pressure vessel 3 and accessory 4. To achieve this, the device features a welding arm 2 that extends into the interior of pressure vessel 3, allowing support plate 5 to slide horizontally along the surface of the welding arm 2 and enter the interior of pressure vessel 3. Then, a cylinder 6 mounted on the front of support plate 5 drives a fixed plate 7 to move vertically. Support wheels 18 and two sets of sliders 9, along with support plate 10, are mounted on the surface of fixed plate 7 to rotate and abut against the bottom of the inner wall of pressure vessel 3. A linear motor 14 mounted on the front of support plate 10 drives support plate 15 and welding head 17 downwards, causing welding head 17 to... By adjusting the height to accommodate the welding angles of the pressure vessel 3 and accessory 4, and simultaneously using the cylinder 6 to drive the fixed plate 7 downward, the support plate 10, connecting frame 12, and pressure roller 13 press the accessory 4 downward, thus achieving the pre-welding clamping operation of accessory 4. The rotation of the support roller 1 causes the pressure vessel 3 to rotate, and the support roller 18 and pressure roller 13 roll against the rotating pressure vessel 3 and accessory 4 respectively, enabling the welding head 17 to synchronously weld the welds of the pressure vessel 3 and accessory 4 during rotation. This design automates the welding and pre-welding positioning work of the device, significantly reducing labor costs, effectively protecting employee safety and health, and greatly improving the welding efficiency of the device.

[0037] In this embodiment, the fixing mechanism 8 includes a fixing column 81 fixedly installed in the middle of the front of the support plate 5. A turntable 82 is rotatably installed on the outer surface of the fixing column 81. Two sets of locking columns 83 are fixedly connected to the front of the turntable 82. The fixing mechanism 8 also includes an adapter rod 88 fixedly connected to the inner side of the slider 9. One end of the adapter rod 88 is hinged to a connecting rod 84. One end of the connecting rod 84 is movably sleeved with the locking column 83. A gear 87 is fixedly installed on the outer surface of the turntable 82. The fixing mechanism 8 also includes a power motor 85 fixedly installed on the top of the fixing plate 7. The output shaft of the power motor 85 is fixedly connected to a worm gear 86. The worm gear 86 is rotatably installed on the top of the front of the fixing plate 7. The worm gear 86 meshes with the gear 87. This device achieves automatic adjustment of the distance between the two sets of pressure rollers 13 and welding heads 17 through the setting of a fixing mechanism 8. A turntable 82 located on the front of the fixing plate 7 drives the connecting rod 84 to rotate, thereby enabling the two sets of sliders 9 to move synchronously in opposite directions through the movement of the crank structure, and achieving efficient change of the distance between the two sets of pressure rollers 13 and welding heads 17. A power motor 85 and a worm gear 86 located on the top of the fixing plate 7 drive the gear 87 and the turntable 82 to rotate, and the unidirectional transmission between the worm gear 86 and the gear 87 achieves the self-locking function of the sliders 9 after the adjustment position, effectively improving the stability of the device.

[0038] In this embodiment, two sets of locking posts 83 are equidistantly distributed on the front of the turntable 82, and two sets of sliders 9 achieve synchronous reverse movement through the fixing mechanism 8. like Figure 2 As shown, the locking pins 83 are set in two groups, which are equidistantly distributed in a circle with the axis of the turntable 82 as the reference. When the turntable 82 drives the locking pins 83 to rotate, it can drive the connecting rod 84 to rotate, thereby pulling the adapter rod 88 and the slider 9 to adjust the spacing of the pressure roller 13.

[0039] In this embodiment, a rotating column 16 is movably sleeved on the bottom of the front side of the support plate 15, and a welding head 17 is fixedly installed on the rear end of the rotating column 16. Multiple sets of slots 20 are opened on the bottom of the back side of the support plate 15. A limiting ring 19 located on the rear side of the support plate 15 is fixedly installed on the outer surface of the rotating column 16. Multiple sets of fixing strips 21 that are adapted to the slots 20 are fixedly connected to the front side of the limiting ring 19. The fixing strips 21 are adapted to be engaged in the slots 20. A spring 23 and an adapter ring 22 located in front of the support plate 15 are movably sleeved on the outer surface of the rotating column 16. The front end of the adapter ring 22 abuts against the front end of the rotating column 16. The two ends of the spring 23 are elastically connected to the support plate 15 and the adapter ring 22, respectively. This device also optimizes the angle adjustment of the welding head 17. The welding head 17 is installed using a rotating column 16. A limiting ring 19 and a fixing strip 21 located behind the support plate 15 are fixedly installed on the outer surface of the rotating column 16, allowing the fixing strip 21 to be inserted into the slot 20, thus limiting the angle adjustment of the rotating column 16 and the welding head 17. Then, a spring 23 and an adapter ring 22 located on the front of the support plate 15 are sleeved on the outer surface of the rotating column 16. The rotating column 16 and the limiting ring 19 are pushed forward, so that the fixing strip 21 is firmly inserted into the slot 20, thereby fixing the welding head 17. When it is necessary to adjust the angle of the welding head 17, simply press the rotating column 16 one after the other, causing the limiting ring 19 and the fixing strip 21 to disengage from the slot 20. After rotating the rotating column 16 to adjust the angle of the welding head 17, the fixing strip 21 is reset by the spring 23, thus re-fixing the welding head 17.

[0040] In this embodiment, the spring 23 is compressed and disposed on the front side of the support plate 15, the axial cross-section of the rotating column 16 is "T" shaped, and the front end of the adapter ring 22 abuts against the inner side of the protrusion of the rotating column 16. like Figure 6 As shown, the "T"-shaped rotating post 16 can abut against the adapter ring 22, so that the rotating post 16 can avoid driving the spring 23 to rotate when rotating, thereby increasing or decreasing the tension of the spring 23 and maintaining the fixation of the welding head 17.

[0041] In this embodiment, the support wheel 18 is used to abut against the inner wall of the pressure vessel 3, and the pressure wheel 13 is used to press the surface of the accessory 4. The support wheel 18 rolls against the inner wall of the pressure vessel 3, and the axis of the pressure wheel 13 is perpendicular to the axis of the pressure vessel 3. The support roller 18 presses down on the pressure vessel 3. Through the rotational support of the support roller 1, the pressure vessel 3 can rotate stably during welding. The pressure roller 13 is used to press the accessory 4 tightly against the inner wall of the pressure vessel 3, maintaining the welding quality of the weld between the pressure vessel 3 and the accessory 4.

[0042] In this embodiment, the tilt angles of the left and right welding heads 17 are the same, and they are symmetrically distributed with the axis of the cylinder 6 extension end as the reference. like Figure 2 As shown, the two sets of symmetrical welding heads 17 can be moved horizontally by a linear motor 11, and the tilt angle of the welding heads 17 can be directly adjusted by rotating the rotating column 16, so that the welding points of the welding heads 17 can be aligned with the weld between the pressure vessel 3 and the accessory 4, which is highly flexible.

[0043] In this embodiment, the minimum number of slots 20 is 40, and they are distributed equidistantly around the outer surface of the rotating column 16. like Figure 7As shown, the angle adjustment unit of the welding head 17 driven by the rotating column 16 decreases as the number of slots 20 increases. That is, the more slots 20 there are, the higher the angle adjustment accuracy of the welding head 17 each time. The number of 40 sets is just enough to ensure the angle adjustment accuracy of the welding head 17 in this device.

[0044] In this embodiment, the welding head 17 is higher than the connecting frame 12 and the pressure roller 13, and the welding head 17 and the pressure roller 13 are staggered in front and behind. The welding head 17 is higher than the pressure roller 13, which can weld the weld between the pressure vessel 3 and the accessory 4, while the pressure roller 13 is used to press the accessory 4 tightly, so that the accessory 4 fits the inner wall of the pressure vessel 3 better and improves the welding quality.

[0045] In this embodiment, the axis of the support wheel 18 is parallel to the axis of the pressure vessel 3, and the support wheel 18 is located on the right side of the back of the fixing plate 7. like Figure 2 As shown, the support wheel 18 is used to press the inner wall of the pressure vessel 3 to maintain the stability of the pressure vessel 3 during welding rotation.

[0046] Working principle: When this device is in operation: First, the pressure vessel 3 is positioned on top of the support roller 1 and can rotate under the drive of the support roller 1. The accessory 4 is pre-positioned on the inner wall of the pressure vessel 3 by spot welding. Figure 1 As shown, the support plate 5 can slide horizontally along the surface of the welding arm 2, so that any set of accessories 4 to be welded is located in the middle of the two sets of pressure rollers 13, thus completing the positioning of accessories 4 on the inner wall of the pressure vessel 3. Then, the power motor 85 is started and drives the worm gear 86 and the turntable 82 to rotate, so that the turntable 82 drives the two sets of connecting rods 84 to rotate through the locking pin 83, and rotates the adapter rod 88 to pull the two sets of sliders 9 to move, thereby adjusting the distance between the two sets of support plates 10 and the pressure rollers 13, so that the two sets of pressure rollers 13 can be located on the upper side of the accessory 4 at the same time. Then, the cylinder 6 is started and drives the fixing plate 7, support rollers 18 and pressure rollers 13 to move downward. The support rollers 18 abut against the bottom of the inner wall of the pressure vessel 3 and apply pressure. The pressure rollers 13 are driven to press down on the accessory 4 to complete the fixing. Finally, adjust the angle of the weld joint 17 according to the distribution of weld joints on the inner wall of pressure vessel 3 as shown in Appendix 4, such as... Figure 6 and Figure 7As shown, press the rotating column 16 towards the side closer to the support plate 15, and drive the adapter ring 22, the limiting ring 19 and the welding head 17 to move backward, compressing the spring 23. At the same time, the fixing strip 21 is disengaged from the locking inside the slot 20. At this time, the rotating column 16 can be rotated and the angle of the welding head 17 can be changed so that it can be aligned with the weld seam of the pressure vessel 3 and the accessory 4. Then, release the rotating column 16 so that it resets under the elastic force of the spring 23. The fixing strip 21 is re-locked into the slot 20 and the welding head 17 is fixed under the elastic pressure of the spring 23. After the device enters the inner cavity of the pressure vessel 3, the welding head 17 is energized and welding is performed between the pressure vessel 3 and the accessory 4. At the same time, the support roller 1 is started and the pressure vessel 3 is rotated. At this time, the support roller 18 and the pressure roller 13 roll and abut against the pressure vessel 3 and the accessory 4 respectively. After the support roller 1 completes one rotation, the welding of a set of accessories 4 is completed.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A circumferential welder for internal fittings, used for welding a pressure vessel (3) and fittings (4), wherein the fittings (4) are pre-positioned on the inner wall of the pressure vessel (3) by spot welding, characterized in that, include: Support rollers (1), the support rollers (1) are configured in two sets, and provide rotational support for the pressure vessel (3); A welding arm (2) is located on one side of a support roller (1). The welding arm (2) extends into the interior of the pressure vessel (3). A support plate (5) is slidably mounted on the front of the welding arm (2). A cylinder (6) is fixedly mounted on the top of the front of the support plate (5). A fixing plate (7) slidably mounted on the front of the support plate (5) is fixedly connected to the telescopic end of the cylinder (6). A slider (9) and a support plate (10) are slidably mounted on the left and right sides of the front of the fixing plate (7). A support plate (10) is fixedly mounted on the front of the support plate (10). Linear motor 2 (14), linear motor 1 (11) is slidably mounted on the front of linear motor 2 (14), support plate (15) is slidably mounted on the front of linear motor 1 (11), welding head (17) is installed inside support plate (15), connecting frame (12) is fixedly connected to the bottom of support plate 2 (10), pressure roller (13) is movably sleeved on the bottom of connecting frame (12), support wheel (18) is fixedly mounted on the back of fixed plate (7), and a fixing mechanism (8) is connected between the two sets of support plates 2 (10).

2. The tank internal accessory circumferential welder according to claim 1, characterized in that, The fixing mechanism (8) includes a fixing column (81) fixedly installed in the middle of the front of the support plate (5). A turntable (82) is rotatably installed on the outer surface of the fixing column (81). Two sets of locking pins (83) are fixedly connected to the front of the turntable (82). The fixing mechanism (8) also includes an adapter rod (88) fixedly connected to the inner side of the slider (9). One end of the adapter rod (88) is hinged to a connecting rod (84). One end of the connecting rod (84) is movably sleeved with the locking pin (83). A gear (87) is fixedly installed on the outer surface of the turntable (82). The fixing mechanism (8) also includes a power motor (85) fixedly installed on the top of the fixing plate (7). The output shaft of the power motor (85) is fixedly connected to a worm gear (86). The worm gear (86) is rotatably installed on the top of the front of the fixing plate (7). The worm gear (86) meshes with the gear (87).

3. The tank internal accessory circumferential welder according to claim 2, characterized in that, The two sets of pins (83) are equidistantly distributed on the front of the turntable (82), and the two sets of sliders (9) achieve synchronous reverse movement through the fixing mechanism (8).

4. The tank internal accessory circumferential welder according to claim 3, characterized in that, A rotating column (16) is movably sleeved on the bottom of the front side of the support plate (15). The welding head (17) is fixedly installed on the rear end of the rotating column (16). Multiple sets of slots (20) are opened on the bottom of the back side of the support plate (15). A limiting ring (19) located on the rear side of the support plate (15) is fixedly installed on the outer surface of the rotating column (16). Multiple sets of fixing strips (21) that are adapted to the slots (20) are fixedly connected to the front side of the limiting ring (19). The fixing strips (21) are adapted to be engaged in the slots (20). A spring (23) and an adapter ring (22) located in front of the support plate (15) are movably sleeved on the outer surface of the rotating column (16). The front end of the adapter ring (22) abuts against the front end of the rotating column (16). The two ends of the spring (23) are elastically connected to the support plate (15) and the adapter ring (22) respectively.

5. The tank internal accessory circumferential welder according to claim 4, characterized in that, The spring (23) is compressed and set on the front of the support plate (15), the axial section shape of the rotating column (16) is "T" shaped, and the front end of the adapter ring (22) abuts against the inner side of the protrusion of the rotating column (16).

6. The tank internal accessory circumferential welder according to claim 5, characterized in that, The support wheel (18) is used to abut against the inner wall of the pressure vessel (3), the pressure wheel (13) is used to press the surface of the accessory (4), the support wheel (18) rolls against the inner wall of the pressure vessel (3), and the axis of the pressure wheel (13) is perpendicular to the axis of the pressure vessel (3).

7. The tank internal accessory circumferential welder according to claim 6, characterized in that, The two sets of welding heads (17) have the same tilt angle and are symmetrically distributed on the left and right sides with the axis of the telescopic end of the cylinder (6) as the reference.

8. The tank internal accessory circumferential welder according to claim 7, characterized in that, The number of slots (20) is at least 40, and they are distributed equidistantly around the outer surface of the rotating column (16).

9. The tank internal accessory circumferential welder according to claim 8, characterized in that, The welding head (17) is higher than the connecting frame (12) and the pressure roller (13), and the welding head (17) and the pressure roller (13) are staggered front and back.

10. The tank internal accessory circumferential welder according to claim 9, characterized in that, The axis of the support wheel (18) is parallel to the axis of the pressure vessel (3) and the support wheel (18) is located on the right side of the back of the fixed plate (7).

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