CN118616895A - A pressure vessel circular seam arc welding device convenient for concentric alignment - Google Patents

Abstract

The present invention provides a pressure vessel circumferential seam arc welding device that is convenient for concentric alignment, and belongs to the field of circumferential seam welding technology. It solves the problem that the existing pressure vessel circumferential seam arc welding device cannot achieve accurate concentric docking, which affects the accuracy of circumferential seam welding. A pressure vessel circumferential seam arc welding device that is convenient for concentric alignment includes a bottom box, and the left and right sides of the bottom box are rotatably connected with a first screw rod. In the present invention, the upper clamp assembly is driven to move by a horizontal plate, so that the horizontal plate drives the upper steel pipe to move downward vertically to achieve accurate docking, ensuring the concentric effect of the two steel pipes, and through the insertion of the polygonal groove rod and the polygonal hole, the concentric fitting unit is driven to achieve transmission, which is convenient for the toothed rod at the steel pipe weld to move outward at the center of the circle, realizing the concentric movement of multiple fitting cylinders, facilitating the fitting and tightening of the inside of the weld, ensuring the accuracy of the weld docking, further realizing the concentric alignment of the pressure vessel, and having a simple structure.

Description

A pressure vessel circular seam arc welding device convenient for concentric alignment

Technical Field

The invention belongs to the technical field of girth welding, and relates to a girth arc welding device for a pressure vessel, in particular to a girth arc welding device for a pressure vessel that is easy to align concentrically.

Background Art

A pressure vessel refers to a closed device that contains gas or liquid and bears a certain pressure. Pressure vessels are mainly cylindrical in shape and are usually made by welding in sections. A straight steel pipe is welded together with the bottom and head of the bottle. Circular welding is used when welding two by two.

After searching, it is found that a pressure vessel circumferential seam welding device is disclosed in Chinese patent documents [Application No.: CN202320544409.4; Publication No.: CN219254625U]. This pressure vessel circumferential seam welding device moves close to the barrel through a positioning box with abutting members, and the abutting members located on both sides of the barrel abut the end caps to fix the end caps and the barrel, so that when welding the gap between the end caps and the barrel, the barrel and the end caps are not easy to move.

Although the pressure vessel circumferential seam welding device disclosed in the patent improves welding stability by tightening the end cover and the barrel, since the pressure vessel is usually cylindrical, the two ends are easily offset due to the difference in the center of the circle when they are butt-jointed, and this is usually discovered during the welding process or at the end of welding, which increases the production cost of the pressure vessel. In addition, the rotation of the pressure vessel during welding is prone to displacement during the rotation process, resulting in low accuracy of the circumferential seam and affecting the aesthetics of the weld.

Summary of the invention

The purpose of the present invention is to address the above-mentioned problems in the existing technology and to propose a pressure vessel circumferential arc welding device that is easy to concentrically align. The technical problem to be solved by the invention is: how to achieve precise concentricity of two sections of pressure vessel components and perform circumferential welding under the action of steel pipe fixation.

The purpose of the present invention can be achieved by the following technical solutions:

A pressure vessel annular seam arc welding device convenient for concentric alignment comprises a bottom box, the left and right sides of the bottom box are rotatably connected with a first screw rod, the outer wall of the first screw rod is connected with a cross plate through a ball nut, the first screw rod is driven by a driving assembly, the top end of the first screw rod is connected with a top plate through a bearing, and a guide column is fixedly installed between the top plate and the bottom box;

The surface of the bottom box is fixedly connected with a clamping box, and the surface of the clamping box is symmetrically telescopically provided with a clamping seat, the surface of the clamping box is fixedly connected with a seam pasting assembly, and an upper clamping assembly is arranged above the seam pasting assembly, and the upper clamping assembly is connected at the bottom end of the horizontal plate;

The seam-attaching assembly includes a plurality of guide rods, and the guide rods are fixedly mounted on the surface of the clamping seat, the top ends of the guide rods are fixedly connected to an upper connecting plate, and the bottom ends of the upper connecting plate are rotatably connected to a second screw rod through a bearing, the outer wall of the second screw rod is connected to a lifting plate through a ball nut, and a plurality of concentric fitting units are equidistantly distributed in an annular manner on the surface of the lifting plate;

The concentric fitting unit comprises a fixed box, and the fixed box is fixedly mounted on the surface of the lifting plate, a rotating rod is rotatably connected to one side of the fixed box close to the center of the lifting plate, and a main gear is fixedly connected to the outer wall of the rotating rod, and driven gears are rotatably connected to both sides of the main gear through a transmission pulley unit, and the driven gear is rotatably arranged at one end of the fixed box away from the main gear;

The bottom end of the driven gear is meshedly connected with a gear rod, and the gear rod is telescopically arranged below the fixed box, the outer end of the gear rod is fixedly connected with a connecting seat, and one side of the connecting seat is rotatably connected with a fitting cylinder;

The lifting plate and the upper connecting plate are both provided with a polygonal hole at the center of the circle, and the two polygonal holes are arranged in parallel;

The upper clamp assembly includes a fixing rod, and the fixing rod is fixedly connected to the bottom end of the horizontal plate, the bottom end of the fixing rod is fixedly connected to the chassis, and the outer wall of the chassis is fixedly connected to a plurality of cross bars, the outer wall of the cross bar is telescopically sleeved with two sleeves, and the bottom ends of the sleeves are fixedly connected to the clamping plate;

The upper parts of the two sleeves are connected with sleeve seats through movable plates, and both ends of the movable plates are connected with the sleeve seats and sleeves through movable shafts;

The two sleeves are respectively installed on the upper and lower sides of the fixing plate through electric push rods, and the fixing plate is fixedly installed on the outer wall of the fixing rod;

The bottom end of the chassis is fixedly connected with a polygonal groove rod, and the outer wall of the polygonal groove rod is provided with tooth grooves, and the polygonal groove rod is movably inserted into the inside of the polygonal hole;

A welding assembly is arranged on the outer side of the seam-sealing assembly, and the welding assembly is installed on the surface of the bottom box.

The working principle of the present invention is as follows: by sleeved the bottom steel pipe to be welded on the outside of the seam-sticking component, the clamping box at the bottom of the steel pipe is used to limit and clamp the bottom steel pipe through the clamping seat on the surface, ensuring that the bottom steel pipe is concentrically sleeved on the outside of the seam-sticking component. At the same time, the upper steel pipe to be welded is fixed on the bottom of the cross plate through the upper clamping component, so that the cross plate can drive the upper steel pipe to move downward and fit the surface of the lower steel pipe. By arranging the seam-sticking component inside the steel pipe, the lifting plate can drive the concentric fitting unit to move to the pipe seam by driving. When the upper clamping component drives the upper steel pipe to dock with the lower steel pipe, under the action of multiple groups of clamping plates equidistantly in annular circles, the upper clamping component drives the steel pipe to move concentrically downward, so that the polygonal groove rod is synchronously inserted downward into the inside of the polygonal hole. By arranging multiple concentric fitting units in an annular manner on the outer wall of the polygonal hole, multiple fitting cylinders are synchronously fitted on the inner wall of the steel pipe, ensuring the concentricity of the two steel pipes. The structure is simple, which facilitates the subsequent welding assembly to weld on the outer wall of the steel pipe through annular rotation.

The lifting plate and the upper connecting plate are both arranged in a circular structure, and the centers of the lifting plate and the upper connecting plate coincide with each other;

An electric motor is fixedly mounted on the surface of the upper connecting plate, and an output end of the electric motor is connected to a second screw rod.

With the above structure, the lifting plate is arranged parallel to the upper connecting plate. When the electric motor drives the second screw to rotate, the position of the lifting plate can be adjusted, ensuring that the concentric fitting units on the surface of the lifting plate are accurately fitted to the joints.

The multiple concentric fitting units are equidistantly arranged in a ring shape with the polygonal hole as the center.

With the above structure, under the action of multiple concentric fitting units, tooth grooves are set through the outer wall of the polygonal groove rod. When the polygonal groove rod is inserted into the inside of the polygonal hole, the polygonal groove rod is meshed with the main gear through the tooth grooves on the outer wall, thereby realizing the driving of the main gear and facilitating the main gear to drive the driven gear to rotate through the transmission pulley unit.

The transmission pulley unit comprises two synchronous wheels, and the two synchronous wheels are respectively fixedly mounted on the outer walls of the main gear and the driven gear, and the outer walls of the two synchronous wheels are meshed with synchronous belts.

With the above structure, under the action of the transmission pulley unit, when the main gear rotates, the driven gear rotates synchronously in the same direction, so that the driven gear drives the connecting seat to move outward through the gear rod at the bottom, ensuring that the connecting seat is tightly fitted against the inner wall of the weld through the fitting tube.

The sleeve and the casing are both provided with a slideway inside to accommodate the movement of the movable shaft;

The two sleeves are respectively a first sleeve and a second sleeve, and the second sleeve is arranged on a side of the outer wall of the crossbar close to the chassis;

The bottom end of the first sleeve is fixedly connected with an outer clamping plate;

The bottom end of the second sleeve is fixedly connected with an inner clamping plate, and the inner clamping plate is arranged in parallel with the outer clamping plate.

With the above structure, the inner clamping plate and the outer clamping plate are arranged in parallel, and by sleeve-mounting the sleeve on the outer wall of the crossbar, the position of the sleeve on the outer wall of the crossbar is moved to achieve the clamping of the steel pipe by the two clamping plates.

The movable plate is a first movable plate and a second movable plate, and the bottom of the first movable plate is connected to the top of the first sleeve through a first lower movable shaft, and the top of the first movable plate is connected to one side of the upper sleeve through a first upper movable shaft;

The bottom of the second movable plate is connected to the upper part of the second sleeve through a second lower movable shaft, and the top of the second movable plate is connected to one side of the lower sleeve through a second upper movable shaft.

With the above structure, under the action of the movable plate, the movable plate can adjust the angle through the movable shafts at both ends, thereby realizing the adjustment of the position of the sleeve on the outer wall of the crossbar, making it easier for the clamp to clamp and limit steel pipes of different diameters.

The plurality of cross bars are distributed in an annular manner and at equal intervals on the outer wall of the chassis, and one end of the cross bar away from the chassis is fixedly connected to the limiting plate.

With the above structure, through the arrangement of multiple cross bars, two clamping plates are arranged on the outer wall of each cross bar, so that the clamping plates can fix different positions of the steel pipe in a circular shape, thereby ensuring the stability of the steel pipe.

The driving assembly includes a bidirectional motor, and the bidirectional motor is fixedly installed on the top of the top plate, and the output end of the bidirectional motor is fixedly connected to the top end of the first screw rod.

By adopting the above structure, under the action of the bidirectional motor, the first screw rod can drive the cross plate to be flexibly raised and lowered, and by arranging a guide column on the outer wall of the first screw rod, the moving path of the cross plate is stable, ensuring that the cross plate drives the steel pipe to be accurately and concentrically connected downward through the bottom upper clamping assembly.

The welding assembly includes a support plate, and the support plate is attached to the surface of the bottom box, a vertical plate is fixedly installed on the surface of the support plate, and a laser welding gun is installed on the side of the vertical plate close to the seam-attaching assembly through a bracket;

A vertical rod is rotatably arranged inside the support plate, and a planetary gear is fixedly connected to the outer wall of the vertical rod. A gear plate is meshingly connected to the outer wall of the planetary gear, and the gear plate is fixedly installed inside the bottom box;

With the above structure, the servo motor drives the vertical rod to rotate, so that the planetary gear rotates on the outer wall of the gear plate and rotates on its own, ensuring the circular movement effect of the vertical plate outside the workpiece;

The bottom end of the vertical rod is rotatably connected to a movable plate, and the movable plate moves in a circular manner inside the bottom box, and a bottom groove capable of accommodating the movement of the movable plate is provided inside the bottom box;

A servo motor is fixedly connected to the surface of the support plate, and an output end of the servo motor is fixedly connected to the top end of the vertical pole.

The bottom end of the support plate is fixedly connected with a positioning block, and the bottom end of the positioning block is slidably connected with a guide groove, and the guide groove is opened on the surface of the bottom box;

With the above structure, the positioning block and the moving plate are arranged to enable the support plate to move accurately on the surface of the bottom box, thereby preventing the support plate from maintaining a stable direction when the planetary gear rotates, thereby ensuring accurate circumferential welding of the workpiece;

A through groove capable of accommodating the movement of the upright pole is formed through the surface of the bottom box, and the through groove is a circular structure coinciding with the center of the gear plate.

With the above structure, through the rotation setting of the vertical rod, the planetary gear can rotate around the outer wall of the gear plate when rotating, so that the vertical rod can move through the inside of the through groove, ensuring the vertical rod drives the support plate to move.

Compared with the prior art, the pressure vessel annular seam arc welding device of the present invention has the following advantages:

1. In the present invention, the upper clamping assembly is driven to move by the horizontal plate, so that the horizontal plate drives the upper steel pipe to move downward vertically for precise docking, ensuring the concentric effect of the two steel pipes, and the concentric fitting unit is driven by the insertion of the polygonal groove rod and the polygonal hole, so that the tooth rod at the weld of the steel pipe moves outward at the center of the circle, realizing the concentric movement of multiple fitting cylinders, facilitating the fitting and tightening of the inside of the weld, ensuring the accuracy of the weld docking, and further realizing the concentric alignment of the pressure vessel, and the structure is simple and easy to operate.

2. In the present invention, under the action of the upper clamping assembly, by arranging sleeves on the upper and lower parts of the fixed plate, under the action of the electric push rod, the upper and lower sleeves are moved back to back, so that the sleeves sleeved on the outer wall of the cross bar can drive the clamping plates to move towards each other to clamp the pipe wall, and through the annular distribution of the cross bar, the synchronization of the clamping of the steel pipe is achieved, which is convenient for concentrically docking the steel pipe above the seam assembly.

3. In the present invention, under the action of the seam fitting assembly, the lifting plate is driven to move by the second screw, so that the concentric fitting units can fit the welds at different heights, and by arranging a plurality of concentric fitting units equidistantly in a ring on the surface of the lifting plate, the polygonal groove rod can mesh and drive the main gear, thereby realizing the transmission of the driven gear, facilitating the concentric and synchronous outward movement of a plurality of annularly distributed gear rods, so that the fitting cylinder can fit the welds equidistantly on the inner wall, thereby ensuring the concentric effect of the two sections of steel pipes, and helping to avoid the displacement of the steel pipes during welding, thereby improving the stability of steel pipe welding.

4. In the present invention, under the action of the welding assembly, the vertical rod is driven to rotate by the servo motor, so that the planetary gear rotates and rotates on the outer wall of the gear plate, so that the vertical plate drives the laser welding gun on one side to perform circumferential welding on the outer wall of the steel pipe, thereby achieving the fixation of the steel pipe after concentric docking. Precise welding is performed by rotating the laser welding gun, which can effectively prevent the displacement of the steel pipe during welding, and the circumferential rotation welding of the laser welding gun is conducive to achieving welding uniformity and improving the aesthetics of the weld.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a pressure vessel annular seam arc welding device that facilitates concentric alignment according to the present invention;

2 is a schematic diagram of the connection structure between the seam pasting assembly and the bottom box in the present invention;

FIG3 is a schematic structural diagram of a lifting plate and a concentric laminating unit in the present invention;

FIG4 is a schematic cross-sectional view of the concentric bonding unit of the present invention;

FIG5 is a schematic structural diagram of an upper clamp assembly in the present invention;

FIG6 is a schematic cross-sectional view of the structure of a polygonal groove rod according to the present invention;

FIG7 is a schematic diagram of a side cross-sectional structure of a welding assembly in the present invention;

FIG8 is a schematic diagram of the structure of the planetary gear and the gear plate in the present invention.

In the figure, 1, bottom box; 2, first screw rod; 3, top plate; 4, cross plate; 5, guide column; 6, upper clamping assembly; 601, fixed rod; 602, chassis; 603, cross rod; 604, limit plate; 605, first sleeve; 606, outer clamping plate; 607, first lower movable shaft; 608, first movable plate; 609, first upper movable shaft; 6010, upper sleeve seat; 6011, electric push rod; 6012, fixed plate; 6013, lower sleeve seat; 6014, second upper movable shaft; 6015, second movable plate; 6016, second lower movable shaft; 6017, second sleeve; 6018, inner clamping plate; 6019, polygonal groove rod; 7, clamping box; 8, clamping seat; 9, seam assembly; 901, guide rod ;902, upper connecting plate;903, second screw rod;904, electric motor;905, lifting plate;906, fixed box;907, rotating rod;908, main gear;909, synchronous wheel;9010, synchronous belt;9011, driven gear;9012, gear rod;9013, connecting seat;9014, fitting tube;9015, polygonal hole;10, welding assembly;1001, vertical plate;1002, laser welding gun;1003, support plate;1004, vertical rod;1005, planetary gear;1006, gear plate;1007, positioning block;1008, moving plate;1009, guide groove;1010, bottom groove;1011, servo motor;1012, through groove;11, bidirectional motor.

DETAILED DESCRIPTION

The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in Figures 1 to 8, a pressure vessel annular seam arc welding device that is convenient for concentric alignment includes a bottom box 1, and the left and right sides of the bottom box 1 are rotatably connected with a first screw rod 2, and the outer wall of the first screw rod 2 is connected to a cross plate 4 through a ball nut, and the first screw rod 2 is driven by a driving component, and the top of the first screw rod 2 is connected to a top plate 3 through a bearing, and a guide column 5 is fixedly installed between the top plate 3 and the bottom box 1, and the cross plate 4 is slidably sleeved on the outer wall of the guide column 5, so that the moving path of the cross plate 4 is stable, ensuring that the cross plate 4 drives the steel pipe below to accurately and concentrically dock downward, wherein the driving component includes a bidirectional motor 11, and the bidirectional motor 11 is fixedly installed on the top of the top plate 3, and the output end of the bidirectional motor 11 is fixedly connected to the top of the first screw rod 2, under the action of the bidirectional motor 11, the first screw rod 2 can drive the cross plate 4 to be flexibly lifted and lowered, and the driving is simple and the practical cost is low;

Further, a clamp box 7 is fixedly connected to the surface of the bottom box 1, and a clamp seat 8 is symmetrically telescopically arranged on the surface of the clamp box 7, and the clamp seat 8 is a symmetrically arranged "V"-shaped structure. The clamping of the clamp box 7 and the clamp seat 8 is an existing clamp structure, which will not be repeated here. Considering that the two steel pipes of the pressure vessel are precisely butted concentrically, a seam assembly 9 is fixedly connected to the surface of the clamp box 7. Specifically, the seam assembly 9 includes a plurality of guide rods 901, and the guide rods 901 are fixedly installed on the surface of the clamp seat 8. The top of the guide rods 901 is fixedly connected to an upper connecting plate 902, and the upper connecting plate 9 The bottom end of 02 is rotatably connected to the second screw rod 903 through a bearing, an electric motor 904 is fixedly installed on the surface of the upper connecting plate 902, and the output end of the electric motor 904 is connected to the second screw rod 903, and the outer wall of the second screw rod 903 is connected to the lifting plate 905 through a ball nut. Through such an arrangement, the second screw rod 903 is rotated under the action of the electric motor 904, so that the lifting plate 905 can drive the concentric bonding units on the surface to bond welds of different heights, thereby ensuring the flexibility of the device. The lifting plate 905 and the upper connecting plate 902 are both circular structures The lifting plate 905 is arranged such that the center of the circle of the lifting plate 905 coincides with the center of the circle of the upper connecting plate 902. The center of the circle of the lifting plate 905 and the center of the circle of the upper connecting plate 902 are penetrated with a polygonal hole 9015, and the upper and lower polygonal holes 9015 are arranged in parallel, and the surface of the lifting plate 905 is annularly equidistantly distributed with a plurality of concentric fitting units. Specifically, the plurality of concentric fitting units are annularly equidistantly arranged with the polygonal hole 9015 as the center, and the concentric fitting units include a fixed box 906, and the fixed box 906 is fixedly installed on the surface of the lifting plate 905, and the fixed box 906 rotates on the side close to the center of the circle of the lifting plate 905 A rotating rod 907 is connected, and a main gear 908 is fixedly connected to the outer wall of the rotating rod 907. Both sides of the main gear 908 are connected to the driven gear 9011 through a transmission pulley unit. Specifically, the transmission pulley unit includes two synchronous wheels 909, and the two synchronous wheels 909 are respectively fixedly installed on the outer walls of the main gear 908 and the driven gear 9011, and the outer walls of the two synchronous wheels 909 are meshed with a synchronous belt 9010. Under the action of the transmission pulley unit, when the main gear 908 rotates, the driven gear 9011 rotates synchronously in the same direction;

The driven gear 9011 is rotatably arranged at one end of the fixed box 906 away from the main gear 908, the bottom end of the driven gear 9011 is meshedly connected with a gear rod 9012, and the gear rod 9012 is telescopically arranged below the fixed box 906, the outer end of the gear rod 9012 is fixedly connected with a connecting seat 9013, and one side of the connecting seat 9013 is rotatably connected with a fitting cylinder 9014, through such an arrangement, the driven gear 9011 drives the gear rod 9012 at the bottom to drive the connecting seat 9013 to move outward by rotation, so that the connecting seat 9013 drives the fitting cylinder 9014 outward to fit the inner wall of the weld, thereby ensuring the fitting effect of the joints of the two steel pipes, which is beneficial to improving the concentricity of the steel pipe docking and facilitating the external welding assembly 10 to perform precise welding work;

As shown in Figures 1 to 8, an upper clamping assembly 6 is arranged above the seam assembly 9, and the upper clamping assembly 6 is connected to the bottom end of the cross plate 4. The upper clamping assembly 6 includes a fixing rod 601, and the fixing rod 601 is fixedly connected to the bottom end of the cross plate 4. The bottom end of the fixing rod 601 is fixedly connected to a chassis 602, and the outer wall of the chassis 602 is fixedly connected to a plurality of cross bars 603. The plurality of cross bars 603 are distributed equidistantly in a ring on the outer wall of the chassis 602. Under the action of the plurality of cross bars 603, by arranging a splint on the outer wall of each cross bar 603, the splint can be distributed in a ring to fix different positions of the steel pipe, thereby ensuring the stability of the steel pipe, and the end of the cross bar 603 away from the chassis 602 is fixedly connected to a limited position. Plate 604, the outer wall telescopic sleeve of the cross bar 603 is provided with two sleeves, and the bottom ends of the sleeves are fixedly connected with clamps, the two sleeves are respectively a first sleeve 605 and a second sleeve 6017, and the second sleeve 6017 is arranged on the side of the outer wall of the cross bar 603 close to the chassis 602, the bottom end of the first sleeve 605 is fixedly connected with the outer clamp 606, the bottom end of the second sleeve 6017 is fixedly connected with the inner clamp 6018, and the inner clamp 6018 is arranged in parallel with the outer clamp 606. Under the effect of setting the inner clamp 6018 in parallel with the outer clamp 606, by sleeve-mounting the sleeve on the outer wall of the cross bar 603, the position of the sleeve on the outer wall of the cross bar 603 is moved, so that the two clamps can clamp the steel pipe;

The upper parts of the two sleeves are connected with a sleeve seat through a movable plate, and both ends of the movable plate are connected with the sleeve seat and the sleeve through a movable shaft. The sleeve seat and the sleeve are provided with a slideway inside to accommodate the movement of the movable shaft. Through the setting of the slideway, the two ends of the movable plate are flexible when moving, ensuring the moving range of the movable plate, and the structure is simple and maintenance is convenient. The movable plate is a first movable plate 608 and a second movable plate 6015, and the bottom of the first movable plate 608 is connected to the upper part of the first sleeve 605 through a first lower movable shaft 607, and the top of the first movable plate 608 is connected to the upper part of the first sleeve 605 through a first upper movable shaft 608. The movable shaft 609 is connected to one side of the upper sleeve 6010, the bottom of the second movable plate 6015 is connected to the top of the second sleeve 6017 through the second lower movable shaft 6016, and the top of the second movable plate 6015 is connected to one side of the lower sleeve 6013 through the second upper movable shaft 6014. Under the action of the movable plate, the movable plate can adjust the angle through the movable shafts at both ends. Under the action of the fixed length of the movable plate, the movable plate drives the sleeve to move the position, realizing the adjustment of the position of the sleeve on the outer wall of the cross bar 603, which is convenient for the clamping plate to clamp and limit the steel pipes of different diameters;

The two sockets are respectively installed on the upper and lower sides of the fixing plate 6012 through the electric push rod 6011, and the fixing plate 6012 is fixedly installed on the outer wall of the fixing rod 601. The bottom end of the chassis 602 is fixedly connected to the polygonal groove rod 6019. The outer wall of the polygonal groove rod 6019 is provided with tooth grooves, and the polygonal groove rod 6019 is movably inserted into the inside of the polygonal hole 9015. Through the arrangement of the polygonal groove rod 6019 and the plurality of concentric fitting units, and the number of sides of the polygonal groove rod 6019 and the number of concentric fitting units are arranged in the same manner, under the effect of the tooth grooves arranged on the outer wall of the polygonal groove rod 6019, when the polygonal groove rod 6019 is inserted into the inside of the polygonal hole 9015, the polygonal groove rod 6019 meshes with the main gear 908 through the tooth grooves on the outer wall, thereby realizing the driving effect of the main gear 908, so that the main gear 908 can drive the driven gear 9011 to rotate through the transmission pulley unit;

As shown in FIGS. 1 to 8 , a welding assembly 10 is disposed on the outside of the seam-attaching assembly 9, and the welding assembly 10 includes a support plate 1003, and the support plate 1003 is attached to the surface of the bottom box 1, a vertical plate 1001 is fixedly installed on the surface of the support plate 1003, and a laser welding gun 1002 is installed on the side of the vertical plate 1001 close to the seam-attaching assembly 9 through a bracket, a vertical rod 1004 is rotatably arranged inside the support plate 1003, and a planetary gear 1005 is fixedly connected to the outer wall of the vertical rod 1004, and a gear 1005 is meshedly connected to the outer wall of the planetary gear 1005 The plate 1006 is fixedly installed inside the bottom box 1; with the above structure, the servo motor 1011 drives the vertical rod 1004 to rotate, so that the planetary gear 1005 rotates on the outer wall of the gear plate 1006 and rotates on its own, ensuring the circular movement effect of the vertical plate 1001 outside the workpiece; the bottom end of the vertical rod 1004 is rotatably connected to the moving plate 1008, and the moving plate 1008 moves in an annular manner inside the bottom box 1, and the bottom box 1 is provided with a bottom groove 1010 that can accommodate the movement of the moving plate 1008;

Furthermore, considering the driving of the support of the upright pole 1004, a servo motor 1011 is fixedly connected to the surface of the support plate 1003, and the output end of the servo motor 1011 is fixedly connected to the top of the upright pole 1004, and a positioning block 1007 is fixedly connected to the bottom end of the support plate 1003, and a guide groove 1009 is slidably connected to the bottom end of the positioning block 1007, and the guide groove 1009 is provided on the surface of the bottom box 1. Through the arrangement of the positioning block 1007 and the movable plate 1008, the support plate 1003 can move accurately on the surface of the bottom box 1, avoiding the support plate 1003 on the planetary gear 1005 maintains a stable direction when rotating, ensuring accurate circumferential welding of the workpiece. A through groove 1012 is opened on the surface of the bottom box 1 to accommodate the movement of the vertical rod 1004, and the through groove 1012 is a circular structure that coincides with the center of the gear plate 1006. Through such an arrangement, under the action of the vertical rod 1004, the planetary gear 1005 can rotate around the outer wall of the gear plate 1006 when rotating, so that the vertical rod 1004 can move through the inside of the through groove 1012, ensuring the vertical rod 1004 drives the support plate 1003 to move.

The working principle of the present invention is as follows: when in use, the lower section of the steel pipe that is easily pressurized is sleeved on the outer wall of the seam-seaming component 9, and under the action of the clamp seat 8 symmetrically arranged on the surface of the clamp box 7, the clamp seat 8 symmetrically clamps the lower steel pipe at the bottom, thereby realizing the concentric sleeve of the lower steel pipe on the outside of the seam-seaming component 9. At the same time, the upper section of the steel pipe to be welded is sleeved on the outside of the polygonal groove rod 6019, and the edge of the steel pipe is arranged between the inner clamp plate 6018 and the outer clamp plate 606. By arranging the upper sleeve seat 6010 and the lower sleeve seat 6013 at the upper and lower ends of the fixed plate 6012 through the electric push rod 6011, the upper sleeve seat 6010 and the lower sleeve seat 6013 are made to move back to back at the upper and lower ends of the fixed plate 6012. When the upper sleeve seat 6010 moves upward, the movable plate is connected to the outer side of the upper sleeve seat 6010 through a movable shaft. Under the action of the fixed length of the movable plate , the movable plate drives the first sleeve 605 to move through the first lower movable shaft 607 at the bottom, and the first sleeve 605 drives the outer clamping plate 606 at the bottom to move toward the inner clamping plate 6018. At the same time, when the lower sleeve seat 6013 moves downward, the movable plate is synchronously moved through the movable shaft. Under the action of the second sleeve 6017 connected to the second lower movable shaft 6016 at the bottom of the movable plate, the second sleeve 6017 drives the inner clamping plate 6018 to move toward the outer clamping plate 606, so that the clamping plate fixes and clamps the steel pipe wall on both sides. Under the action of multiple annular equidistantly arranged cross bars 603, multiple annularly distributed clamping plates fix and clamp the steel pipe. After the upper end of the steel pipe is fixed, it is driven by the bidirectional motor 11 to rotate the first screw rod 2, so that the cross plate 4 drives the upper steel pipe through the upper clamping assembly 6 at the bottom. The upper clamping assembly 6 is moved vertically downward. At the same time, by fixing the polygonal groove rod 6019 at the bottom end of the chassis 602, under the action of the polygonal hole 9015 that penetrates the surface of the lifting plate 905 and the upper connecting plate 902, the polygonal groove rod 6019 is plugged into the inside of the polygonal hole 9015 when the upper clamping assembly 6 moves downward. By arranging a plurality of concentric fitting units equidistantly in an annular manner on the outer wall of the polygonal hole 9015, the outer wall of the polygonal groove rod 6019 is meshed with the main gear 908 through the tooth groove. Under the action of the transmission pulley unit, the driven gear 9011 is rotated synchronously, so that the gear rod 9012 telescopically arranged at the outer end of the fixed box 906 moves outward, and the gear rod 9012 drives the fitting cylinder 9014 to fit and tighten the inner wall of the steel pipe weld through the connecting seat 9013, thereby ensuring the concentricity of the two sections of steel pipe. At the same time, at the bottom box Under the action of the support plate 1003 arranged on the surface, the servo motor 1011 drives the vertical rod 1004 to rotate, so that the vertical rod 1004 drives the planetary gear 1005 on the outer wall to rotate, so that the planetary gear 1005 rotates in a circle around the outer wall of the gear plate 1006 and rotates on its own, so that the support plate 1003 drives the vertical plate 1001 on the surface to rotate in a circle, so that when the steel pipe is fixed, the vertical plate 1001 performs a circumferential seam on the outer wall of the steel pipe through the laser welding gun 1002, ensuring the stability of welding, and by arranging a positioning block 1007 at the bottom end of the vertical support plate 1003, the stability of the support plate 1003 during rotation is achieved, so that the laser welding gun 1002 above is convenient for accurately performing circumferential seam welding on the pipe fitting, and the effect of fixing the circumferential seam of the welding gun on the steel pipe is achieved, thus completing the working principle of the circumferential seam arc welding device for pressure vessels.

In summary, by sleeved the bottom steel pipe to be welded on the outside of the seam fitting component 9, the clamping box 7 at the bottom of the steel pipe can limit and clamp the bottom steel pipe through the clamping seat 8 on the surface, ensuring that the bottom steel pipe is concentrically sleeved on the outside of the seam fitting component 9. At the same time, the upper steel pipe to be welded is fixed at the bottom of the cross plate 4 through the upper clamping component 6, so that the cross plate 4 can drive the upper steel pipe to move downward and fit the surface of the lower steel pipe. By arranging the seam fitting component 9 inside the steel pipe, the lifting plate 905 can be driven to drive the concentric fitting unit to move to the pipe seam, and the upper clamping component 6 drives the upper steel pipe to align with the lower steel pipe. During connection, under the action of multiple groups of equidistant annular clamps, the upper clamp assembly 6 drives the steel pipe to move concentrically downward, so that the polygonal groove rod 6019 is synchronously inserted downward into the interior of the polygonal hole 9015. By arranging multiple concentric fitting units in a ring shape on the outer wall of the polygonal hole 9015, multiple fitting cylinders 9014 are synchronously fitted on the inner wall of the steel pipe, thereby ensuring the concentricity of the two steel pipes. The structure is simple, which facilitates the subsequent welding assembly 10 to weld on the outer wall of the steel pipe through circular rotation, thereby solving the problem that the existing pressure vessel annular seam arc welding device cannot achieve accurate concentric connection, affecting the annular seam welding accuracy.

The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims (10)

1. The utility model provides a pressure vessel girth arc welding device convenient to concentric alignment, includes base box (1), its characterized in that, the left and right sides of base box (1) rotates and is connected with first lead screw (2), and the outer wall of first lead screw (2) is connected with diaphragm (4) through ball nut, and first lead screw (2) are driven through drive assembly, the top of first lead screw (2) is connected with roof (3) through the bearing, and fixedly mounted has guide post (5) between roof (3) and the base box (1);

The surface of the bottom box (1) is fixedly connected with a clamping box (7), the surface of the clamping box (7) is symmetrically and telescopically provided with clamping seats (8), the surface of the clamping box (7) is fixedly connected with a joint component (9), an upper clamping component (6) is arranged above the joint component (9), and the upper clamping component (6) is connected at the bottom end of the transverse plate (4);

The joint component (9) comprises a plurality of guide rods (901), the guide rods (901) are fixedly arranged on the surface of the clamping seat (8), the top ends of the guide rods (901) are fixedly connected with an upper connecting plate (902), the bottom ends of the upper connecting plate (902) are rotationally connected with a second screw rod (903) through bearings, the outer wall of the second screw rod (903) is connected with a lifting plate (905) through ball nuts, and a plurality of concentric attaching units are annularly distributed on the surface of the lifting plate (905) at equal intervals;

The concentric laminating unit comprises a fixed box (906), the fixed box (906) is fixedly arranged on the surface of a lifting plate (905), one side, close to the center of the lifting plate (905), of the fixed box (906) is rotationally connected with a rotating rod (907), the outer wall of the rotating rod (907) is fixedly connected with a main gear (908), two sides of the main gear (908) are in transmission connection with driven gears (9011) through transmission belt wheel units, and the driven gears (9011) are rotationally arranged at one end, far away from the main gear (908), of the inside of the fixed box (906);

The bottom end of the driven gear (9011) is connected with a toothed bar (9012) in a meshed manner, the toothed bar (9012) penetrates through the lower part of the fixed box (906) in a telescopic manner, the outer end of the toothed bar (9012) is fixedly connected with a connecting seat (9013), and one side of the connecting seat (9013) is rotatably connected with a laminating cylinder (9014);

the center of the lifting plate (905) and the center of the upper connecting plate (902) are respectively provided with a polygonal hole (9015) in a penetrating way, and the two polygonal holes (9015) are arranged in parallel;

the upper clamping assembly (6) comprises a fixing rod (601), the fixing rod (601) is fixedly connected to the bottom end of the transverse plate (4), a chassis (602) is fixedly connected to the bottom end of the fixing rod (601), a plurality of transverse rods (603) are fixedly connected to the outer wall of the chassis (602), two sleeves are sleeved on the outer wall of the transverse rods (603) in a telescopic manner, and clamping plates are fixedly connected to the bottom ends of the sleeves;

the upper parts of the two sleeves are connected with sleeve seats through movable plates, and the two ends of the movable plates are connected with the sleeve seats and the sleeves through movable shafts;

The two sleeve seats are respectively arranged above and below the fixed plate (6012) through the electric push rod (6011), and the fixed plate (6012) is fixedly arranged on the outer wall of the fixed rod (601);

the bottom end of the chassis (602) is fixedly connected with a polygonal groove rod (6019), tooth grooves are formed in the outer walls of the polygonal groove rod (6019), the polygonal groove rod (6019) is movably inserted into the polygonal hole (9015), and the outer walls of the polygonal groove rod (6019) are in meshed connection with the main gear (908);

the outside of the joint bonding assembly (9) is provided with a welding assembly (10), and the welding assembly (10) is arranged on the surface of the bottom box (1).

2. The arc welding apparatus for circular seam of pressure vessel convenient for concentric alignment according to claim 1, wherein the lifting plate (905) and the upper connecting plate (902) are all arranged in a circular structure, and the center of the lifting plate (905) and the center of the upper connecting plate (902) are coincident;

An electric motor (904) is fixedly arranged on the surface of the upper connecting plate (902), and a second screw rod (903) is connected to the output end of the electric motor (904).

3. A pressure vessel girth arc welding apparatus for facilitating concentric alignment according to claim 1, wherein a plurality of said concentric attaching units are arranged in a circular shape at equal intervals with the polygonal hole (9015) as a center.

4. The pressure vessel girth arc welding apparatus for facilitating concentric alignment according to claim 1, wherein the driving pulley unit comprises two synchronizing wheels (909), the two synchronizing wheels (909) are fixedly mounted on the outer walls of the main gear (908) and the driven gear (9011), and the outer walls of the two synchronizing wheels (909) are engaged with a synchronous belt (9010).

5. The pressure vessel girth arc welding apparatus of claim 1, wherein the inside of the sleeve seat and the inside of the sleeve tube are provided with slide ways capable of accommodating the movement of the movable shaft;

The two sleeves are a first sleeve (605) and a second sleeve (6017) respectively, and the second sleeve (6017) is arranged on one side, close to the chassis (602), of the outer wall of the cross rod (603);

The bottom end of the first sleeve (605) is fixedly connected with an outer clamping plate (606);

The bottom end of the second sleeve (6017) is fixedly connected with an inner clamping plate (6018), and the inner clamping plate (6018) and the outer clamping plate (606) are arranged in parallel.

6. The pressure vessel girth arc welding apparatus for facilitating concentric alignment according to claim 1, wherein the movable plates are a first movable plate (608) and a second movable plate (6015), and the bottom of the first movable plate (608) is connected above the first sleeve (605) by a first lower movable shaft (607), and the top of the first movable plate (608) is connected to one side of the upper sleeve seat (6010) by a first upper movable shaft (609);

The bottom of the second movable plate (6015) is connected above the second sleeve (6017) through a second lower movable shaft (6016), and the top of the second movable plate (6015) is connected to one side of the lower sleeve seat (6013) through a second upper movable shaft (6014).

7. The pressure vessel girth arc welding apparatus for facilitating concentric alignment according to claim 1, wherein a plurality of said cross bars (603) are annularly and equidistantly arranged on the outer wall of the chassis (602), and one end of the cross bar (603) remote from the chassis (602) is fixedly connected with a limiting plate (604).

8. A pressure vessel girth arc welding apparatus for facilitating concentric alignment according to claim 1, wherein said driving assembly comprises a bi-directional motor (11), and the bi-directional motor (11) is fixedly installed at the top of the top plate (3), and the output end of the bi-directional motor (11) is fixedly connected with the top end of the first screw (2).

9. The pressure vessel girth arc welding apparatus for facilitating concentric alignment according to claim 1, wherein the welding assembly (10) comprises a pallet (1003), the pallet (1003) is attached to the surface of the bottom case (1), a riser (1001) is fixedly installed on the surface of the pallet (1003), and a laser welding gun (1002) is installed on one side of the riser (1001) close to the joint assembly (9) through a bracket;

The inside of the supporting plate (1003) rotates with a vertical rod (1004), the outer wall of the vertical rod (1004) is fixedly connected with a planetary gear (1005), the outer wall of the planetary gear (1005) is connected with a gear disc (1006) in a meshed manner, and the gear disc (1006) is fixedly arranged in the bottom box (1);

the bottom end of the vertical rod (1004) is rotatably connected with a moving plate (1008), the moving plate (1008) moves annularly inside the bottom box (1), and a bottom groove (1010) capable of accommodating the moving plate (1008) to move is formed inside the bottom box (1);

The surface of the supporting plate (1003) is fixedly connected with a servo motor (1011), and the output end of the servo motor (1011) is fixedly connected with the top end of the vertical rod (1004).

10. The pressure vessel girth arc welding apparatus for facilitating concentric alignment according to claim 9, wherein the bottom end of the supporting plate (1003) is fixedly connected with a positioning block (1007), the bottom end of the positioning block (1007) is slidably connected with a guiding groove (1009), and the guiding groove (1009) is opened on the surface of the bottom case (1);

The surface of the bottom box (1) is provided with a penetrating groove (1012) which can accommodate the movement of the vertical rod (1004) in a penetrating way, and the penetrating groove (1012) is of a circular structure which coincides with the circle center of the gear disc (1006).