Welding aid device for large-size circular ring

Abstract

The utility model discloses a welding aid device for a large-size circular ring, which comprises a mounting plate, a plurality of moving components mounted on the mounting plate in a sliding manner, vacuum positioning components mounted on the moving components, and distance monitoring components mounted on the vacuum positioning components and the moving components, the moving assembly can drive the vacuum positioning assemblies to move in the length direction of the mounting plate and control the vacuum positioning assemblies to ascend and descend, so that the vacuum positioning assemblies make contact with the circular ring, the circular ring is positioned, and the position of each vacuum positioning assembly is monitored through the distance monitoring assembly. Through the arrangement of the vacuum positioning assembly, the circular ring positioning device can ascend and descend, make contact with the outer wall of a circular ring and then ascend to a designated position to position the circular ring, a pulling plate does not need to be welded to the outer wall of the circular ring for positioning, and therefore the pulling plate does not need to be removed subsequently, positioning of the circular ring is simpler, and the working efficiency is improved. And no welding trace is left on the outer wall of the circular ring.

Description

TECHNICAL FIELD

[0001] The utility model relates to air separation equipment production technical field, concretely relates to a kind of welding device for large size ring. BACKGROUND

[0002] Air separation equipment takes air as raw material, and air is changed into liquid state by the method of compression cycle deep freezing, and then oxygen, nitrogen and argon and other inert gases are gradually separated from liquid air by rectification. Air separation equipment is a large and complex system, including power system, purification system, refrigeration system, heat exchange system, rectification system and other multiple subsystems.

[0003] When producing air separation equipment, the size and weight of the air separation equipment are very large, and the welding quality of the air separation equipment is crucial to the safe use of the project. Therefore, based on the consideration of manufacturing capacity, transportation convenience, welding quality control, construction flexibility, cost-effectiveness and other aspects, the existing technology generally welds shorter rings first, and then welds multiple shorter rings to form longer rings.

[0004] When welding multiple shorter rings, the rings are generally made of magnesium-aluminum alloy material. When the diameter of the ring is large, the weight of the ring itself and the support force of the bottom surface may cause elastic or plastic deformation of the ring material. In order to ensure convenient welding operation, enhance structural strength and improve welding quality, multiple pull plates are welded on the ring wall away from the ground as positioning points before welding and connecting two rings, and the ring is provided with upward pulling force by a travelling crane or other equipment to partially offset the gravity of the ring. However, the pull plates need to be removed afterwards, which is very troublesome, and the welding marks are also left after the pull plates are removed, affecting the appearance of the equipment.

[0005] Therefore, it is urgent to provide a welding device for large size ring, which is simple to operate, does not need to weld pull plates as positioning points, and helps to prevent welding deformation of large size ring and improve welding quality. SUMMARY

[0006] The utility model aims at providing a welding device for large size ring to solve the problem that the existing ring needs to weld pull plates before welding, and the pull plates need to be removed after welding, which is very troublesome, and the welding marks left after removing the pull plates affect the appearance of the equipment.

[0007] In order to achieve the above object, the utility model provides a kind of welding device for large size torus, it includes mounting plate, multiple slidingly installed on the moving assembly of mounting plate, vacuum positioning assembly is installed on moving assembly, distance monitoring assembly is installed on vacuum positioning assembly and moving assembly;Moving assembly can drive vacuum positioning assembly to move along the length direction of mounting plate, and control vacuum positioning assembly to move up and down, make vacuum positioning assembly contact with torus, position torus, the position of each vacuum positioning assembly is monitored by distance monitoring assembly.

[0008] Optionally, the mounting plate is provided with a moving groove corresponding to the moving assembly and a guide groove, the guide groove is communicated with the moving groove, and the slotting direction of the guide groove is perpendicular to the slotting direction of the moving groove.

[0009] Optionally, the moving assembly includes a moving block matched with the moving groove, a guide plate installed on both ends of the moving block and penetrating the guide groove, and a power structure installed on the guide plate;The vacuum positioning assembly is installed on the moving block;The distance monitoring assembly is installed on the vacuum positioning assembly and the guide plate;The top of the mounting plate is provided with a lifting eye screw.

[0010] Optionally, the power structure includes a mounting column movably installed on the guide plate, a motor installed at the bottom of the guide plate, a rotating column installed on the motor, a driving wheel fixedly installed on the rotating column, and a driven wheel movably installed on the mounting column, and the driven wheel and the driving wheel are tightly attached to the outer wall of the mounting plate.

[0011] Optionally, the vacuum positioning assembly includes a lifting cylinder and a vacuum air pump installed on the moving block, an electric control electromagnetic valve installed on the moving block and communicated with the vacuum air pump, a movable connection structure installed on the lifting cylinder, and a vacuum chuck movably installed on the movable connection structure and communicated with the electric control electromagnetic valve.

[0012] Optionally, the movable connection structure includes a movable connection plate installed on the lifting cylinder, a connecting lug installed on the movable connection plate, and a rotating shaft movably installed on the connecting lug, and the rotating shaft is movably connected to the top end of the vacuum chuck.

[0013] Optionally, the vacuum chuck is provided with a movable hole corresponding to the rotating shaft.

[0014] Optionally, the distance monitoring assembly includes a first infrared distance sensor installed on the movable connection plate and facing the moving block, an extension structure installed on the guide plate, a second infrared distance sensor installed on the extension structure and facing the ground, and a third infrared distance sensor installed on the guide plate 22 and facing the adjacent guide plate.

[0015] Optionally, the telescopic structure comprises an extension plate mounted on the guide plate, a telescopic electric cylinder mounted on the extension plate, a telescopic slot arranged on the extension plate, a telescopic plate movably mounted in the telescopic slot and connected with the telescopic electric cylinder, and the second infrared distance sensor is mounted on the telescopic plate.

[0016] Optionally, the bottom of the mounting plate is detachably mounted with a lifting support frame, and the bottom of the lifting support frame is mounted with a moving positioning structure.

[0017] Optionally, the lifting support frame comprises a T-shaped mounting frame, a connecting plate mounted on the T-shaped mounting frame, a mounting slot arranged at the bottom of the T-shaped mounting frame, a lead screw motor mounted in the mounting slot, a lifting slot arranged at the top of the T-shaped mounting frame, an end plate mounted at the slot opening of the lifting slot, a lead screw pair movably mounted on the end plate and connected with the lead screw motor, a lifting plate mounted on the lead screw pair, and the mounting plate is mounted on the top of the lifting plate.

[0018] Optionally, the moving positioning structure comprises a moving wheel mounted at the bottom of the T-shaped mounting frame, a supporting electric cylinder mounted on the T-shaped mounting frame, and a supporting block mounted on the supporting electric cylinder.

[0019] Compared with the prior art, the welding aid device for large-size circular rings has the following beneficial effects:

[0020] The welding aid device for large-size circular rings can be lifted and moved to contact the outer wall of the circular ring, and then positioned at a specified position, without the need for welding a pull plate on the outer wall of the circular ring for positioning, so that the pull plate does not need to be removed subsequently, the positioning of the circular ring is simpler, and no welding marks are left on the outer wall of the circular ring.

[0021] In addition, the movement of each vacuum positioning assembly can be realized by the movement assembly, so that the vacuum positioning assembly is moved to a specified position of the circular ring for positioning the circular ring, and the distance detection assembly can ensure that the mounting plate is in a horizontal state parallel to the ground, can monitor the height position of the vacuum positioning assembly 3, and ensure the positioning accuracy of the circular ring and improve the welding quality. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the overall structure schematic view of the welding aid device of the utility model.

[0023] Figure 2 is the schematic view of the movement assembly, the vacuum positioning assembly and the distance monitoring assembly of the utility model.

[0024] Figure 3 is the welding aid device of the utility model Figure 2 is the local enlarged view of A in the welding aid device of the utility model.

[0025] Figure 4 is a structural schematic diagram of the vacuum chuck.

[0026] Figure 5 is a schematic diagram of the distance monitoring assembly.

[0027] Figure 6 is a schematic diagram of the telescopic structure.

[0028] Figure 7 is a whole structure schematic diagram of the soldering device in embodiment 2 of the utility model.

[0029] Figure 8 is a sectional view of the lifting support frame.

[0030] In the figure, 1 is a mounting plate, 11 is a moving groove, 12 is a guide groove, 13 is a lifting ring screw, 2 is a moving assembly, 21 is a moving block, 22 is a guide plate, 23 is a power structure, 231 is a mounting column, 232 is a motor, 233 is a rotating column, 234 is a driving wheel, 235 is a driven wheel, 3 is a vacuum positioning assembly, 31 is a lifting electric cylinder, 32 is a vacuum air pump, 33 is an electric control electromagnetic valve, 34 is a movable connection structure, 341 is a movable connection plate, 342 is a connecting lug, 343 is a rotating shaft, 35 is a vacuum chuck, 351 is a movable hole, 4 is a distance monitoring assembly, 41 is a first infrared distance measuring sensor, 42 is a telescopic structure, 421 is an extension plate, 422 is a telescopic electric cylinder, 423 is a telescopic groove, 424 is a telescopic plate, 43 is a second infrared distance measuring sensor, 44 is a third infrared distance measuring sensor, 5 is a lifting support frame, 51 is a T-shaped mounting frame, 52 is a connecting plate, 53 is a mounting groove, 54 is a screw rod motor, 55 is a lifting groove, 56 is an end plate, 57 is a screw rod pair, 58 is a lifting plate, 6 is a moving positioning structure, 61 is a moving wheel, 62 is a supporting electric cylinder, 63 is a supporting block. DETAILED DESCRIPTION

[0031] The utility model is described in detail below in combination with the drawings and specific implementation. In the following description, a lot of specific details are set forth in order to fully understand the utility. But the utility can be implemented in many other ways different from the description, and those skilled in the art can make similar extension without violating the connotation of the utility, so the utility is not limited by the specific embodiments disclosed below.

[0032] The soldering device for large-size circular ring can be applied to welding occasions of large-size circular ring in air separation equipment, and can also be applied to other similar application scenarios. The soldering device for large-size circular ring is described in detail below.

[0033] Embodiment 1

[0034] Refer to the drawings Figure 1 —Figure 6 As shown in the drawings, the structure schematic diagram of the preferred embodiment of the welding assisting device for large-sized annular rings is shown. The welding assisting device for large-sized annular rings comprises a mounting plate 1, a plurality of moving assemblies 2 slidably mounted on the mounting plate 1, a vacuum positioning assembly 3 mounted on the moving assemblies 2, and a distance monitoring assembly 4 mounted on the vacuum positioning assembly 3 and the moving assemblies 2. The moving assemblies 2 can drive the vacuum positioning assembly 3 to move along the length direction of the mounting plate 1, and control the vacuum positioning assembly 3 to move up and down, so that the vacuum positioning assembly 3 contacts with the annular ring to position the annular ring. The distance monitoring assembly 4 can monitor the position of each vacuum positioning assembly 3.

[0035] The moving assembly 2 can drive the vacuum positioning assembly 3 to move, so that the vacuum positioning assembly 3 moves to the specified position. The vacuum positioning assembly 3 can contact with the surface of the annular ring and position the annular ring after contacting with the annular ring, so as to ensure the welding quality of the annular ring. Since the vacuum positioning is used, the pull plate does not need to be welded on the outer wall of the annular ring, so the pull plate does not need to be removed, the operation is simple and convenient, the labor intensity of the workers is reduced, and the welding marks are not left, so the appearance of the equipment is not affected. The distance monitoring assembly 4 can monitor the height of the mounting plate 1 and the contact position height of the vacuum positioning assembly 3 and the annular ring.

[0036] Referring to the drawings Figure 1 and Figure 2 As shown in the drawings, in the utility model, the mounting plate 1 is equipped with the moving groove 11 and the guide groove 12 corresponding to the moving assembly 2. The guide groove 12 is communicated with the moving groove 11, and the slotting direction of the guide groove 12 is perpendicular to the slotting direction of the moving groove 11.

[0037] The moving groove 11 provides the installation position for the moving assembly 2, so that the moving assembly 2 moves in the moving groove 11. The guide groove 12 guides the moving direction of the moving assembly 2.

[0038] Referring to the drawings Figure 1 — Figure 3 As shown in the drawings, the moving assembly 2 comprises the moving block 21 matched with the moving groove 11, the guide plate 22 installed on both ends of the moving block 21 and penetrating through the guide groove 12, and the power structure 23 installed on the guide plate 22. The vacuum positioning assembly 3 is installed on the moving block 21. The distance monitoring assembly 4 is installed on the vacuum positioning assembly 3 and the guide plate 22. The mounting plate 1 is provided with the lifting ring screw 13 on the top.

[0039] The utility model discloses a through the setting of moving block 21 provides the installation position for vacuum positioning assembly 3, makes vacuum positioning assembly 3 can move, and the positioning of the different position of circular ring is carried out, through the setting of guide plate 22, moves in guide groove 12, and the movement of moving block 21 is oriented, through the setting of power structure 23, provides power, makes moving block 21 move in guide groove 12 to drive moving block 21 and vacuum positioning assembly 3 to move, through the setting of lifting eye screw 13, makes installation plate 1 can be hoisted through the travelling crane lamp equipment, makes vacuum positioning assembly 3 can position the circular ring.

[0040] Referring to the accompanying drawings Figure 1 Figure 3 As shown in the utility model discloses a power structure 23 including the installation column 231 of movable installation on guide plate 22, the motor 232 of installation on the bottom of guide plate 22, the rotary column 233 of installation on the motor 232, the driving wheel 234 of fixed installation on the rotary column 233, the driven wheel 235 of movable installation on the installation column 231, and the outer wall of installation plate 1 is close to the driven wheel 235, the driving wheel 234 all.

[0041] The utility model discloses a through the setting of installation column 231 for driven wheel 235 provides installation position, through the setting of motor 232, provides power source, through rotary column 233 drive driving wheel 234 rotates, cooperate on driving wheel 234, driven wheel 235 all with the outer wall of installation plate 1 close to the setting, make driving wheel 234, driven wheel 235 rotate and produce friction between the outer wall of installation plate 1, to make moving block 21 and vacuum positioning assembly 3 move.

[0042] Referring to the accompanying drawings Figure 1 Figure 4 As shown in the utility model discloses a vacuum positioning assembly 3 including the lift electric cylinder 31 and vacuum air pump 32 of installation on moving block 21, the electric control solenoid valve 33 of installation on moving block 21 and with vacuum air pump 32 intercommunication, the movable connection structure 34 of installation on lift electric cylinder 31, the vacuum chuck 35 of movable installation on movable connection structure 34 and with electric control solenoid valve 33 intercommunication.

[0043] ​​The utility model discloses a lifting cylinder 31's setting is as power source, drives movable connecting structure 34 to move up and down to drive vacuum chuck 35 to move up and down to can position the ring, guarantee the roundness of ring in the welding process, guarantee the welding quality, through the setting of vacuum air pump 32, as the vacuum source of pumping, the gas remaining in vacuum chuck 35 is pumped, through the setting of electric control solenoid valve 33, the air on-off between vacuum air pump 32 and vacuum chuck 35 is controlled, and the electric control solenoid valve 33 is two position four way valve, namely when vacuum chuck 35 needs to carry out vacuum adsorption, can make vacuum air pump 32 and vacuum chuck 35 intercommunication, and when needing vacuum chuck 35 and ring separation, electric control solenoid valve 33 can move, make vacuum chuck 35 and external atmosphere intercommunication, and the electric control solenoid valve 33 and vacuum chuck 35 are connected through the hose, through the setting of vacuum chuck 35, under the vacuum state, the outer wall of ring is adhered, and with the lifting cylinder 31 can drive vacuum chuck 35 to move up and down to can position the ring.

[0044] Referring to the accompanying Figure 2 — Figure 4 As shown in the utility model, movable connecting structure 34 includes movable connecting plate 341 installed on lifting cylinder 31, connecting lug 342 installed on movable connecting plate 341, and rotating shaft 343 movably installed on connecting lug 342, the rotating shaft 343 is movably connected with the top end of vacuum chuck 35, distance monitoring assembly 4 is installed on movable connecting plate 341 and guide plate 22, and vacuum chuck 35 is provided with movable hole 351 corresponding to rotating shaft 343.

[0045] The utility model discloses the setting of movable connecting plate 341, and with the connecting lug 342, make rotating shaft 343 can install, and make lifting cylinder 31 can drive rotating shaft 343 to move up and down to make vacuum chuck 35 can move up and down, through the setting of movable hole 351, be used for with rotating shaft 343 movable connection, and vacuum chuck 35 can rotate, ensure that vacuum chuck 35 can contact with the torus of ring, and vacuum adsorption on the outer wall of ring.

[0046] Referring to the accompanying Figure 2 — Figure 5 As shown in the utility model, distance monitoring assembly 4 includes first infrared distance measuring sensor 41 installed on movable connecting plate 341 and towards moving block 21, telescopic structure 42 installed on guide plate 22, and second infrared distance measuring sensor 43 installed on telescopic structure 42, the second infrared distance measuring sensor 43 is towards ground, and third infrared distance measuring sensor 44 is installed on guide plate 22 and towards adjacent guide plate 22.

[0047] This invention, through the setting of the first infrared ranging sensor 41, can monitor the distance between the vacuum suction cup 35 and the moving block 21. In conjunction with the setting of the second infrared ranging sensor 43, the position height of the vacuum suction cup 35 can be determined, thereby ensuring the position height of the vacuum suction cup 35 in each vacuum positioning component 3. Through the setting of the telescopic structure 42, the second infrared ranging sensor 43 can be moved to ensure that the second infrared ranging sensor 43 can monitor the distance between the mounting plate 1 and the ground. Through the setting of the third infrared ranging sensor 44, the spacing between adjacent vacuum positioning components 3 can be monitored, thereby ensuring that the spacing of each vacuum positioning component 3 can match the height.

[0048] See appendix Figure 5 and Figure 6 As shown, in this utility model, the telescopic structure 42 includes an extension plate 421 mounted on the guide plate 22, a telescopic electric cylinder 422 mounted on the extension plate 421, a telescopic groove 423 disposed on the extension plate 421, a telescopic plate 424 movably mounted in the telescopic groove 423 and connected to the telescopic electric cylinder 422, and the second infrared ranging sensor 43 mounted on the telescopic plate 424.

[0049] This utility model provides an installation position for the telescopic electric cylinder 422 through the extension plate 421; the telescopic electric cylinder 422 serves as a power source to drive the telescopic plate 424 to telescopically move; the telescopic groove 423 facilitates the telescopic movement of the telescopic plate 424; and the telescopic plate 424 provides an installation position for the second infrared ranging sensor 43, enabling the second infrared ranging sensor 43 to move and ensuring that the second infrared ranging sensor 43 can monitor the distance between the mounting plate 1 and the ground.

[0050] See appendix Figure 1 — Figure 6 As shown, the usage process of this utility model is as follows:

[0051] The first step is to hoist the mounting plate 1 using the eye bolt 13 and the crane, and move it to the upper end of the ring to be positioned. The telescopic electric cylinder 422 in the telescopic structure 42 is controlled by the external controller to start working, so that the telescopic electric cylinder 422 drives the telescopic plate 424 to move outward along the telescopic groove 423, so that the second infrared distance sensor 43 on the telescopic plate 424 can monitor the distance between the mounting plate 1 and the ground.

[0052] Second step, through the external controller, control vacuum positioning assembly 3 in the lifting cylinder 31 work, make lifting cylinder 31 drive activity connection structure 34 to decline, make vacuum chuck 35 decline to designated height, then connect the vacuum chuck 35 of the vacuum positioning assembly 3 in the middle with the top of the ring, and through the controller control corresponding vacuum air pump 32 start work, make vacuum chuck 35 vacuum adsorption in the top of the ring, need to be particularly pointed out, the position of the vacuum positioning assembly 3 in the middle through power structure 23 is located in the middle position of mounting plate 1.

[0053] Third step, through the controller control lifting cylinder 31 on the vacuum positioning assembly 3 in the middle starts work, pull the top of the ring to the designated position to position the top of the ring first;

[0054] Fourth step, based on the vacuum positioning assembly 3 in the middle, then move the adjacent vacuum positioning assembly 3 through power structure 23, limit the position of adjacent vacuum positioning assembly 3 through the third infrared distance sensor 44, then drive vacuum chuck 35 to descend through the corresponding lifting cylinder 31, cooperate with vacuum air pump 32 to make vacuum chuck 35 adsorb on the ring, and then rise to the specified height through the lifting cylinder 31, repeat several times to make the vacuum chuck 35 on all vacuum positioning assembly 3 adsorb on the ring, position the ring;

[0055] Fifth step, repeat the first step to the fourth step, position the ring beside the ring that has been positioned and needs to be welded, then drive two rings through the travelling crane to adjust the position of the two rings, so as to facilitate the welding of the two rings; It needs to be particularly pointed out that the two rings that need to be welded need to be placed adjacent to reduce the time when operating.

[0056] Embodiment 2

[0057] Referring to the accompanying Figure 7 and Figure 8 , the difference between the embodiment and the above embodiment is that in the embodiment, the bottom of the mounting plate 1 is detachably mounted with a lifting support frame 5, and the bottom of the lifting support frame 5 is mounted with a moving positioning structure 6.

[0058] The embodiment can adjust the height of the mounting plate 1 through the setting of the lifting support frame 5, without using the travelling crane, so as to facilitate operation, and the welding aid device will not shake during use, improving the safety during use; Through the setting of the moving positioning structure 6, the lifting support frame 5 can be moved.

[0059] Referring to the accompanying Figure 7 and Figure 8As shown in the drawings, in this embodiment, the lifting support frame 5 comprises a T-shaped mounting frame 51, a connecting plate 52 mounted on the T-shaped mounting frame 51, a mounting groove 53 arranged at the bottom of the T-shaped mounting frame 51, a lead screw motor 54 mounted in the mounting groove 53, a lifting groove 55 arranged at the top of the T-shaped mounting frame 51, an end plate 56 mounted at the slot of the lifting groove 55, a lead screw pair 57 movably mounted on the end plate 56 and connected with the lead screw motor 54, a lifting plate 58 mounted on the lead screw pair 57, and the mounting plate 1 is mounted on the top of the lifting plate 58.

[0060] In this embodiment, the mounting groove 53 is arranged to provide a mounting position for the lead screw motor 54, the lead screw motor 54 is arranged to provide a lead screw power source for the lead screw pair 57, so that the lead screw pair 57 can work, and the lifting plate 58 is arranged to drive the mounting plate 1 to move up and down.

[0061] Referring to FIG. 3, Figure 7 and Figure 8 As shown in the drawings, in this embodiment, the moving positioning structure 6 comprises a moving wheel 61 mounted at the bottom of the T-shaped mounting frame 51, a support cylinder 62 mounted on the T-shaped mounting frame 51, and a support block 63 mounted on the support cylinder 62.

[0062] In this embodiment, the moving wheel 61 is arranged to enable the lifting support frame 5 to move, and the moving wheel 61 can be a universal wheel; the support cylinder 62 is arranged as a power source to drive the support block 63 to move up and down, so that the support block 63 can support the lifting support frame 5, the moving wheel 61 is separated from the ground, and movement during welding is avoided.

[0063] The above embodiments are descriptions of the present application, not limitations of the present application, and any simple transformation of the present application also belongs to the protection scope of the present application.

Claims

1. A welding flux device for large-sized circular rings, characterized in that, Includes a mounting plate (1), multiple movable components (2) slidably mounted on the mounting plate (1), a vacuum positioning component (3) mounted on the movable component (2), and a distance monitoring component (4) mounted on the vacuum positioning component (3) and the movable component (2). The moving component (2) can drive the vacuum positioning component (3) to move along the length of the mounting plate (1) and control the vacuum positioning component (3) to move up and down, so that the vacuum positioning component (3) contacts the ring and positions the ring. The position of each vacuum positioning component (3) is monitored by the distance monitoring component (4).

2. The welding aid for large-sized circular rings according to claim 1, characterized in that, The mounting plate (1) is provided with a moving groove (11) and a guide groove (12) corresponding to the moving component (2). The guide groove (12) is connected to the moving groove (11), and the groove direction of the guide groove (12) is perpendicular to the groove direction of the moving groove (11).

3. The welding aid for large-sized circular rings according to claim 2, characterized in that, The moving component (2) includes a moving block (21) adapted to the moving groove (11), a guide plate (22) installed on both ends of the moving block (21) and passing through the guide groove (12), and a power structure (23) installed on the guide plate (22). The vacuum positioning component (3) is mounted on the moving block (21); The distance monitoring component (4) is mounted on the vacuum positioning component (3) and the guide plate (22); The top of the mounting plate (1) is fitted with eye bolts (13).

4. The welding aid for large-sized circular rings according to claim 3, characterized in that, The power structure (23) includes a mounting column (231) movably mounted on the guide plate (22), a motor (232) mounted on the bottom of the guide plate (22), a rotating column (233) mounted on the motor (232), a drive wheel (234) fixedly mounted on the rotating column (233), and a driven wheel (235) movably mounted on the mounting column (231). The driven wheel (235) and the drive wheel (234) are both in close contact with the outer wall of the mounting plate (1).

5. The welding aid for large-sized circular rings according to claim 3, characterized in that, The vacuum positioning assembly (3) includes a lifting electric cylinder (31) and a vacuum pump (32) mounted on the moving block (21), an electrically controlled solenoid valve (33) mounted on the moving block (21) and connected to the vacuum pump (32), a movable connection structure (34) mounted on the lifting electric cylinder (31), and a vacuum suction cup (35) movably mounted on the movable connection structure (34) and connected to the electrically controlled solenoid valve (33).

6. The welding aid for large-sized circular rings according to claim 5, characterized in that, The movable connection structure (34) includes a movable connection plate (341) mounted on the lifting cylinder (31), a connecting ear (342) mounted on the movable connection plate (341), and a rotating shaft (343) movably mounted on the connecting ear (342). The rotating shaft (343) is movably connected to the top of the vacuum suction cup (35). The distance monitoring component (4) is mounted on the movable connection plate (341) and the guide plate (22). The vacuum suction cup (35) is provided with a movable hole (351) corresponding to the rotating shaft (343).

7. The welding aid for large-sized circular rings according to claim 6, characterized in that, The distance monitoring component (4) includes a first infrared ranging sensor (41) mounted on a movable connecting plate (341) facing the moving block (21), a telescopic structure (42) mounted on a guide plate (22), a second infrared ranging sensor (43) mounted on the telescopic structure (42) facing the ground, and a third infrared ranging sensor (44) mounted on the guide plate (22) facing the adjacent guide plate (22).

8. The welding aid for large-sized circular rings according to claim 7, characterized in that, The telescopic structure (42) includes an extension plate (421) mounted on a guide plate (22), a telescopic electric cylinder (422) mounted on the extension plate (421), a telescopic groove (423) set on the extension plate (421), a telescopic plate (424) movably mounted in the telescopic groove (423) and connected to the telescopic electric cylinder (422), and the second infrared ranging sensor (43) mounted on the telescopic plate (424).

9. The welding aid for large-sized circular rings according to claim 1, characterized in that, The bottom of the mounting plate (1) is detachably equipped with a lifting support frame (5), and the bottom of the lifting support frame (5) is equipped with a movable positioning structure (6).

10. The welding aid for large-sized circular rings according to claim 9, characterized in that, The lifting support frame (5) includes a T-shaped mounting frame (51), a connecting plate (52) mounted on the T-shaped mounting frame (51), a mounting groove (53) at the bottom of the T-shaped mounting frame (51), a lead screw motor (54) mounted in the mounting groove (53), a lifting groove (55) at the top of the T-shaped mounting frame (51), an end plate (56) mounted at the opening of the lifting groove (55), a lead screw pair (57) connected to the lead screw motor (54) and movably mounted on the end plate (56), and a lifting plate (58) mounted on the lead screw pair (57). The mounting plate (1) is mounted on the top of the lifting plate (58). The moving positioning structure (6) includes a moving wheel (61) installed at the bottom of the T-shaped mounting bracket (51), a support electric cylinder (62) installed on the T-shaped mounting bracket (51), and a support block (63) installed on the support electric cylinder (62).

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