CN112247431B

CN112247431B - Tank welding device

Info

Publication number: CN112247431B
Application number: CN202011092099.4A
Authority: CN
Inventors: 张创; 孙加龙; 吴问明
Original assignee: CIMC Vehicles Group Co Ltd; Wuhu CIMC Ruijiang Automobile Co Ltd
Current assignee: CIMC Vehicles Group Co Ltd; Wuhu CIMC Ruijiang Automobile Co Ltd
Priority date: 2020-10-13
Filing date: 2020-10-13
Publication date: 2022-07-15
Anticipated expiration: 2040-10-13
Also published as: CN112247431A

Abstract

The invention provides a tank welding device which comprises a welding frame, an upper support, a lower support, a clamping mechanism and a welding mechanism, wherein the welding frame is arranged on the upper support; the welding frame is arranged along the longitudinal direction; the upper bracket is arranged on the welding frame to bear the tank body in transportation; the upper bracket is configured to be positioned inside the tank body when the tank body is welded; the lower bracket is arranged on the welding frame; the lower bracket is positioned below the upper bracket, and a gap is formed between the lower bracket and the upper bracket; when the tank body is welded, the lower support is arranged on the outer side of the tank body to support the tank body, and a welding seam to be welded of the tank body longitudinally extends into the gap. The holding and clamping mechanism is arranged on the lower support and positioned on two transverse sides of the lower support, and the upper end of the holding and clamping mechanism is higher than the lower support so as to be borne on the periphery of the tank body when the tank body is welded. Thereby can utilize the armful to press from both sides the mechanism and support the both sides of the jar body, the effectual jar body of avoiding rocks along transverse direction, stability when guaranteeing jar body welding, effectual assurance welding quality.

Description

Tank welding device

Technical Field

The invention relates to the technical field of powder tanker production, in particular to a tank welding device.

Background

The powder tank semi-trailer is a special vehicle used in cement factories, cement warehouses, large-scale construction sites and other places, and is used for shipping bulk powder such as cement, mountain flour, chemical powder and the like. The tank body of the powder tank semi-trailer is processed by steel plates through procedures of rolling, welding and the like.

And after the tank body is subjected to edge rolling processing, transferring the tank body to a welding station, and welding the to-be-welded weld joint obtained after edge rolling on the welding station. The existing welding device cannot reasonably support the tank body, and is poor in structural stability, so that the tank body is easy to shake in the welding process, and the welding quality is difficult to guarantee.

Disclosure of Invention

The invention aims to provide a tank welding device, which can effectively support two sides of a tank, ensure the stability of the tank during welding and effectively ensure the welding quality.

In order to solve the technical problems, the invention adopts the following technical scheme:

according to one aspect of the invention, the invention provides a tank body welding device which is used for welding a to-be-welded weld joint of a tank body after rounding processing and comprises a welding frame, an upper support, a lower support, a clamping mechanism and a welding mechanism; the welding frame is arranged along the longitudinal direction; the upper bracket is arranged on the welding frame to bear the tank body in transportation; the upper bracket is configured to be positioned inside the tank body when the tank body is welded; the lower bracket is arranged on the welding frame; the lower bracket is positioned below the upper bracket, and a gap is formed between the lower bracket and the upper bracket; when the tank body is welded, the lower bracket is arranged on the outer side of the tank body to support the tank body, and a weld to be welded of the tank body longitudinally extends into the gap; the upper end of the clamping mechanism is higher than the lower support so as to bear the periphery of the tank body when the tank body is welded; the welding mechanism is arranged on the upper support, is positioned in the tank body and is used for welding a welding seam to be welded of the tank body.

In some embodiments, the clamping mechanisms are symmetrically arranged in the transverse direction, and each clamping mechanism comprises a clamping shaft extending in the longitudinal direction, a plurality of clamping units arranged on the clamping shaft, and a clamping driving unit for driving the clamping shaft to rotate; the clamping shaft is rotatably connected to the lower bracket around the axis of the clamping shaft; the holding and clamping unit is used for supporting the periphery of the tank body.

In some embodiments, the clamping unit comprises a clamping sleeve fixedly sleeved on the clamping shaft, a clamping arm with a lower end fixed on the clamping sleeve, and a riding wheel rotatably connected to an upper end of the clamping arm; the holding clamp arm is of an arc-shaped structure protruding towards the lower bracket, and the riding wheel is used for supporting the periphery of the tank body.

In some embodiments, two holding clamp arms are longitudinally arranged on each group of holding clamp units at intervals, and a plurality of reinforcing ribs are arranged between the two holding clamp arms at intervals along the length direction of the holding clamp arms; the riding wheel is rotatably connected between the two holding clamp arms around a longitudinal axis.

In some embodiments, the upper bracket comprises two welding side frames arranged at a transverse interval; the welding mechanism is connected to one welding side frame in a longitudinally slidable mode and is located in a gap between the two welding side frames.

In some embodiments, the upper bracket further comprises a pressure plate slidably connected to each of the welding side frames; the pressing plate can slide downwards relative to the welding side frame so as to press the bottom of the tank body on the lower support.

In some embodiments, the welding mechanism includes a welding rail fixed to the welding side frame, a welding slide slidably coupled to the welding rail, a welding assembly disposed on the welding slide, and a welding drive assembly for driving the welding slide to slide longitudinally.

In some embodiments, the welding assembly comprises a welding slide block slidably connected to the welding slide plate along the vertical direction, a welding gun head fixedly connected to the welding slide block, and a lifting driving unit for driving the welding slide block to move.

In some embodiments, a support plate is arranged at the top end of the lower bracket, and a welding groove extending along the longitudinal direction is formed in the upper surface of the support plate; the support plate is configured such that, when the can body is welded, the bottom of the can body is supported on the support plate and the weld to be welded is located at the weld groove.

In some embodiments, the weld carriage comprises a weld carriage body, a weld seat, and a weld carriage drive assembly; the welding frame main body is rotatably connected to the welding seat around a vertical axis, and the welding frame driving assembly is used for driving the welding frame main body to rotate; the upper support and the lower support are connected to the welding frame main body.

According to the technical scheme, the invention has at least the following advantages and positive effects:

in the invention, the welding frame is arranged along the longitudinal direction; the upper bracket is arranged on the welding frame; the lower bracket is arranged on the welding frame; the lower bracket is positioned below the upper bracket, the lower bracket and the upper bracket are separated to form interlayer spaces with both transverse sides and one longitudinal end being open; when the tank body is welded, the bottom end of the tank body is abutted to the lower support, and a welding seam to be welded of the tank body is longitudinally arranged in the interlayer space in an extending mode. During welding, the tank body is moved towards the welding frame from the longitudinal end of the welding frame, so that the tank body is sleeved outside the upper support, the bottom end of the tank body is abutted to the lower support, and a welding seam to be welded of the tank body is welded by the aid of the welding mechanism.

Furthermore, the holding and clamping mechanisms are arranged on the lower support and are positioned on two transverse sides of the lower support, and the upper ends of the holding and clamping mechanisms are higher than the lower support so as to be borne on the periphery of the tank body when the tank body is welded. Thereby can utilize the armful to press from both sides the mechanism and support the both sides of the jar body, the effectual jar body of avoiding rocks along transverse direction, stability when guaranteeing jar body welding, effectual assurance welding quality.

Drawings

FIG. 1 is a schematic structural view of an embodiment of the can welding apparatus of the present invention.

FIG. 2 is a schematic view showing a part of the structure of an embodiment of the can welding apparatus of the present invention.

Fig. 3 is a partial schematic view of the can welding apparatus of fig. 1.

Fig. 4 is a partial structural view of the can welding apparatus of fig. 2.

Fig. 5 is a schematic structural diagram of a clasping unit of an embodiment of the can welding device of the present invention.

FIG. 6 is a schematic view showing the structure of a welding mechanism of an embodiment of the can welding apparatus of the present invention.

The reference numerals are illustrated below:

100. welding a frame; 110. a welding frame main body; 120. welding a base; 130. a weld carriage drive assembly; 131. a gear plate; 132. a driving gear; 133. a drive motor; 200. an upper bracket; 210. welding the side frame; 220. pressing a plate; 230. connecting the guide rails; 300. a lower bracket; 310. a support plate; 400. a clamping mechanism; 410. clamping a shaft; 420. a clamping unit; 421. a clamping sleeve; 422. clamping arms are embraced; 423. a riding wheel; 424. reinforcing ribs; 430. a clamp driving unit; 500. a welding mechanism; 510. welding the guide rail; 520. welding the sliding plate; 530. welding the assembly; 531. welding a sliding block; 532. welding the gun head; 533. a lifting drive unit; 534. a wire feeding motor; 535. guiding the elbow; 536. a camera; 540. welding a drive assembly; 541. a displacement rack; 542. a displacement motor; 910. a walking frame; 920. a supporting mechanism.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is understood that the invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the scope of the present invention, and that the description and drawings are to be taken as illustrative and not restrictive in character.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

FIG. 1 is a schematic view of a can welding apparatus according to an embodiment of the present invention. FIG. 2 is a schematic view showing a part of the structure of an embodiment of the can welding apparatus of the present invention.

Referring to fig. 1 and 2, the present embodiment provides a can welding apparatus for welding a weld to be welded of a can body after a rolling process. The tank welding device comprises a welding frame 100, an upper support 200 and a lower support 300 which are arranged on the welding frame 100, a clamping mechanism 400 arranged on the lower support 300 and a welding mechanism 500 arranged on the upper support 200. After the can body to be welded is moved to the can body welding device, the upper bracket 200 and the welding mechanism 500 are located inside the can body, and the lower bracket 300 and the clasping mechanism 400 are located outside the can body. The lower bracket 300 and the clamping mechanism 400 support the tank body, and the welding mechanism 500 welds the weld at the bottom of the tank body.

In this embodiment, the longitudinal direction of the tank welding device is taken as the longitudinal direction, and the width direction of the tank welding device is taken as the transverse direction.

Fig. 3 is a partial schematic view of the can welding apparatus of fig. 1.

Referring to fig. 3, in the present embodiment, the welding stand 100 includes a welding stand main body 110, a welding seat 120, and a welding stand driving assembly 130. The welding stand main body 110 is rotatably connected to the welding seat 120 about a vertical axis, and the welding stand driving assembly 130 is used for driving the welding stand main body 110 to rotate.

In this embodiment, the welding stand driving assembly 130 includes a gear plate 131, a driving gear 132, and a driving motor 133. The gear plate 131 is horizontally disposed and rotatably connected to the welding seat 120 about a vertical axis, and the lower end of the welding stand body 110 is connected to the upper side of the gear plate 131, so that the welding stand body 110 can rotate together with the gear plate 131. The driving motor 133 is fixed on the soldering nest 120, and the driving gear 132 is sleeved on the rotating shaft of the driving motor 133. The pinion gear 132 engages the gear plate 131 to rotate the gear plate 131.

In some embodiments, the lower end of the welding holder main body 110 is connected to the welding holder 120, and the gear plate 131 is horizontally sleeved on the outer circumference of the welding holder main body 110.

In this embodiment, the upper bracket 200 and the lower bracket 300 are both disposed along the longitudinal direction, the same longitudinal end of the upper bracket 200 and the lower bracket 300 is fixedly connected to the welding frame main body 110, and the other end is suspended. The free ends of the upper and

lower holders

200 and 300 are disposed corresponding to an upstream rolling device (not shown in the drawings) to carry the can bodies to be welded, which are moved from the rolling device in the longitudinal direction. After the welding line to be welded of the can body to be welded is welded on the can body welding apparatus, the welding stand main body 110 is rotated so that the free end of the upper bracket 200 and the upstream rounding apparatus are misaligned, and thus the welded can body can be horizontally drawn out from the free ends of the upper bracket 200 and the lower bracket 300 to move the can body to be welded out of the can body welding apparatus.

Fig. 4 is a partial structural view of the can welding apparatus of fig. 2.

Referring to fig. 4, the upper frame 200 includes two welding side frames 210 arranged laterally at a distance, a pressing plate 220 slidably coupled to each welding side frame 210, and a pressing plate driving assembly (not shown) for driving the pressing plate 220 to slide relative to the welding side frames 210.

The pressing plate driving assembly can drive the pressing plate 220 to slide downwards relative to the welding side frame 210 so as to press the bottom of the can body on the lower bracket 300.

The pressing plates 220 are symmetrically arranged along the transverse direction, the pressing plates 220 move downwards, and the bottom end of the tank body close to the welding line is pressed on the lower support 300.

In this embodiment, the upper end of the upper frame 200 is provided with a connecting rail 230, a traveling frame 910 for receiving the upstream rolling device, and a supporting mechanism 920. The connecting rails 230 are respectively disposed on the two welding side frames 210. The welding side frame 210 has a lengthwise direction extending in a longitudinal direction, and the connection rail 230 is provided on the welding side frame 210 in the longitudinal direction.

The walking frame 910 and the racking mechanism 920 are supported on the inner wall of the can body to be welded and move the can body to be welded from the upstream rounding device onto the can body welding in the longitudinal direction so that the upper support 200 is located inside the can body.

Referring to fig. 1 and 3, the lower bracket 300 is positioned below the upper bracket 200, and the upper bracket 200 and the lower bracket 300 have a gap in the vertical direction. Because the same longitudinal sides of the upper bracket 200 and the lower bracket 300 are suspended, the gap between the upper bracket 200 and the lower bracket 300 is open at both sides of the suspended end. So that the lower support 300 can support the can body on the outer side of the can body when the can body is moved from the rolling device for welding, and the weld of the can body to be welded longitudinally extends in the gap between the upper support 200 and the lower support 300.

The gap between the upper and

lower frames

200 and 300 is extended longitudinally, the welding seam to be welded at the bottom of the can body is extended longitudinally, and the can body can be directly welded in the longitudinal direction by the welding mechanism 500 without being turned between the upper and

lower frames

200 and 300.

In this embodiment, a supporting plate 310 is disposed at the top end of the lower bracket 300, and a welding groove (not shown) extending along the longitudinal direction is formed on the upper surface of the supporting plate 310. The supporting plate 310 is located right below the interval between the two welding side frames 210 and is arranged corresponding to the two pressing plates 220, so that when the pressing plates 220 move downwards, the bottom ends of the cans are pressed on the supporting plate 310, and the to-be-welded seams of the cans are located at the welding grooves. When welding mechanism 500 will treat the welding seam welding along vertically, treat that the welding seam that welds is located the top of welding groove, the tender welding position that can effectually avoid the welding position is direct to contact with backup pad 310, avoids jar body and backup pad 310 welding together, effectively avoids backup pad 310 and lower carriage 300 to receive the damage, prolongs the life of backup pad 310 and lower carriage 300.

Referring to fig. 1 and 2 again, the clasping mechanism 400 is disposed on the lower bracket 300 and located at two lateral sides of the lower bracket 300, and the upper end of the clasping mechanism 400 is higher than the lower bracket 300 to bear the periphery of the can body during welding.

In this embodiment, the holding and clamping mechanism 400 is arranged to be two in the transverse symmetry, and the two holding and clamping devices symmetrically support the tank body to prevent the tank body from shaking.

The clasping mechanism 400 comprises a clasping shaft 410 extending along the longitudinal direction, a plurality of clasping units 420 arranged on the clasping shaft 410, and a clasping driving unit 430 for driving the clasping shaft 410 to rotate; the clamping shaft 410 is rotatably connected to the lower bracket 300 around the axis thereof; the clasping unit 420 is used for supporting the periphery of the tank. The axis of the holding shaft 410 is arranged along the longitudinal direction, the holding units 420 are connected to the holding shaft 410 along the longitudinal direction at intervals, and the lower ends of the holding units 420 are fixed to the holding shaft 410 so as to be capable of being turned over by a certain angle under the driving of the holding shaft 410.

In this embodiment, after the can body is moved from the upstream edge rolling device to the can body welding device, the supporting mechanism 920 rotates downward, so that the can body slowly descends until the bottom end of the can body abuts against the supporting plate 310. Meanwhile, the clasping shaft 410 is driven to rotate by the clasping driving unit 430, so that the clasping units 420 at the two sides of the lower bracket 300 are close to each other and abut against the outer side of the tank to support and bear the tank, thereby avoiding the deformation of the bottom of the tank and simultaneously limiting the tank from sliding in the transverse direction. Then, the pressing plate 220 is moved downward to press the bottom of the can against the supporting plate 310.

Fig. 5 is a schematic structural diagram of a clamping unit according to an embodiment of the can welding apparatus of the present invention.

Referring to fig. 5, in the present embodiment, the clasping unit 420 includes a clasping sleeve 421 fixedly sleeved on the clasping shaft 410, a clasping arm 422 having a lower end fixed on the clasping sleeve 421, and a supporting roller 423 rotatably connected to an upper end of the clasping arm 422; the idlers 423 are used for supporting the outer periphery of the can body. The riding wheel 423 is rotatably connected to the holding clamp arm 422 around a longitudinal axis, so that in the descending process of the tank body, friction with the outer side surface of the tank body is rolling friction, friction between the tank body and the holding clamp unit 420 in the descending process of the tank body is reduced, the two sides of the tank body are stressed in parallel in the descending process of the tank body, and the tank body is prevented from inclining.

The supporting roller 423 on the holding arm 422 exceeds the holding arm 422 towards one side of the upper bracket 200, so that the supporting roller 423 can abut against the outer side of the tank body. In some implementations, the idler 423 may be replaced with a roller.

In this embodiment, the holding arm 422 is an arc structure protruding from the lower bracket, and is adapted to the shape of the outer peripheral wall of the tank body, so as to prevent the holding arm 422 from contacting the outer peripheral wall of the tank body, and ensure that the supporting roller 423 abuts against the tank body.

The number of the clamping arms 422 on each group of clamping units 420 is two, and a plurality of reinforcing ribs 424 are arranged between the two clamping arms 422 along the length direction of the clamping arms 422 at intervals, so that the structural strength of the clamping arms 422 is improved.

In this embodiment, the ribs 424 are cylindrical structures, and in some embodiments, the ribs 424 are plate-like structures.

The idler 423 is rotatably connected between the two clamp arms 422 about a longitudinal axis. Specifically, the outer periphery of the supporting roller 423 is a circular or circular arc structure, and the supporting roller 423 is connected between the two holding arms 422 through a rotating shaft.

Fig. 6 is a schematic structural view of a welding mechanism of an embodiment of the can welding apparatus of the present invention.

Referring to fig. 6, the welding mechanism 500 includes a welding rail 510 fixed to the welding side frame 210, a welding slide 520 slidably coupled to the welding rail 510, a welding assembly 530 disposed on the welding slide 520, and a welding driving assembly 540 for driving the welding slide 520 to slide longitudinally.

The welding mechanism 500 is slidably coupled to one of the welding-side frames 210 in the longitudinal direction and is positioned in the gap between the welding-side frames 210. In this embodiment, the welding rails 510 are fixed to one welding-side frame 210 and located on the opposite surfaces of the two welding-side frames 210, and the welding rails 510 are provided in two in the up-down direction, so that the movement of the welding slide 520 is smooth.

The welding driving assembly 540 is used for driving the welding slide 520 to move along the longitudinal direction, so that the welding assembly 530 moves along with the welding slide 520 to weld the longitudinal weld to be welded on the tank body by using the longitudinal movement of the welding assembly 530.

In this embodiment, the welding driving assembly 540 includes a displacement rack 541 fixed on the welding rail 510 and a displacement motor 542 fixed on the welding slide 520; a displacement gear is fixed on an output shaft of the displacement motor 542, and the displacement gear is engaged with the displacement rack 541, so that the welding slide 520 is driven to move by the rotation of the displacement motor 542.

In some embodiments, the welding drive assembly 540 may be a lead screw, belt, or the like.

The welding assembly 530 includes a welding slider 531 slidably connected to the welding slide 520 in the vertical direction, a welding torch head 532 fixedly connected to the welding slider 531, and a lifting/lowering driving unit 533 for driving the welding slider 531 to move.

When a to-be-welded weld of the can body is welded, the lifting driving unit 533 drives the welding slider 531 to move downwards, so that the welding gun head 532 moves downwards along with the welding slider 531 to be close to the to-be-welded weld, and the weld is welded. After the welding machine is completed, the lifting driving unit 533 drives the welding gun head 532 to move upwards.

In this embodiment, the welding slide 520 is further provided with a slider seat (not shown in the figure), the welding slider 531 is connected to the slider seat along a vertical slidable direction, the lifting driving unit 533 is a motor, and the lifting driving unit 533 is connected to the welding slider 531 through a screw rod to drive the welding slider 531 to lift.

In some embodiments, the lifting driving unit 533 is an air cylinder, and the welding slider 531 is driven to lift by the air cylinder.

In this embodiment, the welding slide 520 is further provided with a wire feeding disc (not shown) for providing a welding wire to the welding gun head 532, a wire feeding motor 534 for driving the wire feeding disc to rotate, and the welding gun head 532 is provided with a guide elbow 535 for guiding the welding wire. One end of the wire on the wire feed reel is wound around the wire feed reel and the other end is guided by a guide elbow 535 to be close to the welding gun head 532.

In this embodiment, the welding gun head 532 is further provided with a camera 536, and the angle of the camera 536 is adjustable, so as to obtain image information of the seam inside the tank, so that a worker can clearly see the welding condition inside the tank, thereby ensuring the welding quality.

In this embodiment, after the tank body is fixed by the clamping mechanism 400 and the pressing plate 220, the lifting driving unit 533 drives the welding slider 531 to move downwards, the welding slider 531 drives the welding gun head 532 to move downwards to a preset position, and the welding seam of the tank body is welded through the welding gun head 532. During welding, the wire feeding motor 534 drives the wire feeding disc to continuously feed wires. The welding driving component 540 drives the welding sliding plate 520 to move longitudinally along the welding guide rail 510, and drives the welding gun head 532 to move transversely, so that the welding processing of the seam of the tank body is realized.

In the present invention, the welding jig 100 is arranged in the longitudinal direction; the upper bracket 200 and the lower bracket 300 are mounted on the welding jig 100; the lower bracket 300 is positioned below the upper bracket 200, and the lower bracket 300 has a gap with the upper bracket 200; when the can body is welded, the lower bracket 300 is positioned at the outer side of the can body to support the can body, and the weld of the can body to be welded longitudinally extends in the gap. During welding, the can body is moved from one longitudinal end of the welding frame 100 to the welding frame 100, so that the can body is sleeved outside the upper support 200, the bottom end of the can body abuts against the lower support 300, and a welding seam to be welded of the can body is welded by the welding mechanism 500.

Further, the clasping mechanism 400 is disposed on the lower bracket 300 and located on two lateral sides of the lower bracket 300, and the upper end of the clasping mechanism 400 is higher than the lower bracket 300 so as to be carried on the outer periphery of the tank body when the tank body is welded. Utilize the armful clamp mechanism 400 to support the both sides of the jar body, the effectual jar body of avoiding rocks along transverse direction, stability when guaranteeing jar body welding, effectual assurance welding quality.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. The utility model provides a jar body welding set for the welding of the welding seam that waits to weld of the jar body after the edge rolling processing, its characterized in that includes:

a welding frame arranged along the longitudinal direction;

the upper bracket is arranged on the welding frame to bear the tank body in transportation; the upper bracket is configured to be positioned inside the tank body when the tank body is welded; the upper end of the upper bracket is provided with a connecting guide rail for bearing a walking frame and a bearing mechanism which move from the upstream edge rolling device; the walking frame and the bearing mechanism are supported on the inner wall of the tank body to be welded, and the tank body to be welded is moved to the tank body welding device from an upstream rounding device along the longitudinal direction;

the lower bracket is arranged on the welding frame; the lower bracket is positioned below the upper bracket, and a gap is formed between the lower bracket and the upper bracket; when the tank body is welded, the lower support is arranged on the outer side of the tank body to support the tank body, and a welding seam to be welded of the tank body longitudinally extends into the gap;

the clamping mechanisms are arranged on the lower support and positioned on two transverse sides of the lower support, and the upper ends of the clamping mechanisms are higher than the lower support so as to bear the periphery of the tank body when the tank body is welded;

and the welding mechanism is arranged on the upper bracket, is positioned in the tank body and is used for welding a to-be-welded weld of the tank body.

2. The tank welding device according to claim 1, wherein the clamping mechanisms are symmetrically arranged in the transverse direction, and each clamping mechanism comprises a clamping shaft extending in the longitudinal direction, a plurality of clamping units arranged on the clamping shaft, and a clamping driving unit for driving the clamping shaft to rotate; the clamping shaft is rotatably connected to the lower bracket around the axis of the clamping shaft; the holding and clamping unit is used for supporting the periphery of the tank body.

3. The can welding device according to claim 2, wherein the clamping unit comprises a clamping sleeve fixedly sleeved on the clamping shaft, a clamping arm fixed at the lower end of the clamping sleeve, and a riding wheel rotatably connected to the upper end of the clamping arm; the holding clamp arm is of an arc structure back to the lower support and protrudes, and the supporting wheel is used for supporting the periphery of the tank body.

4. The tank welding device according to claim 3, wherein two holding arms are arranged on each group of holding unit at intervals in the longitudinal direction, and a plurality of reinforcing ribs are arranged between the two holding arms at intervals along the length direction of the holding arms; the riding wheel is rotatably connected between the two holding clamp arms around a longitudinal axis.

5. The apparatus for welding a can body according to claim 1 wherein said upper bracket includes two welding side frames spaced laterally; the welding mechanism is connected to one welding side frame in a longitudinally slidable mode and is located in a gap between the two welding side frames.

6. The can welding apparatus of claim 5 wherein said upper bracket further comprises a pressure plate slidably connected to each of said welding side frames; the pressing plate can slide downwards relative to the welding side frame so as to press the bottom of the tank body on the lower support.

7. The can welding apparatus of claim 5 wherein said welding mechanism comprises a welding rail secured to said welding side frame, a welding carriage slidably coupled to said welding rail, a welding assembly disposed on said welding carriage, and a welding drive assembly for driving said welding carriage to slide longitudinally.

8. The can welding apparatus of claim 7, wherein the welding assembly comprises a welding slider slidably connected to the welding slide in a vertical direction, a welding torch head fixedly connected to the welding slider, and a lifting driving unit for driving the welding slider to move.

9. The tank welding device according to claim 1, wherein a support plate is arranged at the top end of the lower support, and a welding groove extending in the longitudinal direction is formed in the upper surface of the support plate; the support plate is configured such that, when the can body is welded, the bottom of the can body is supported on the support plate and the weld to be welded is located at the welding groove.

10. The can welding apparatus of any one of claims 1-9 wherein said welding carriage comprises a carriage body, a welding seat, and a carriage drive assembly; the welding frame main body is rotatably connected to the welding seat around a vertical axis, and the welding frame driving assembly is used for driving the welding frame main body to rotate; the upper support and the lower support are connected to the welding frame main body.