Positioning mechanism for welding large round iron sheet oil drum

Abstract

The utility model discloses a positioning mechanism for welding a large round iron sheet oil drum, and relates to the technical field of welding, the positioning mechanism comprises a mechanism support, an adjustable positioning mechanism is arranged at the top of the mechanism support, and through the structural arrangement, the positioning mechanism for welding the large round iron sheet oil drum can drive a rotating plate to synchronously and horizontally move by means of a first rotating knob; then the worker rotates a rotating column again, the rotating column drives a first rotating disc to rotate, the first rotating disc extrudes a spring through teeth on the side wall, and when the first rotating disc rotates to a proper angle, a fixing disc is pushed by the spring to fix the first rotating disc; accordingly, the shape of the clamping piece is kept consistent with the radian of the oil drum through adjustment of the multiple vertically-arranged rotating plates, so that iron sheets at the two ends of the welding part are continuously kept in a bent state during welding, enough supporting performance is provided for the iron sheets at the welding part, and the phenomenon that the shape of a drum body is irregular and the welding quality is poor is avoided. And the quality does not meet the requirement.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular to a positioning mechanism for welding large circular sheet metal oil drums. Background Technology

[0002] When welding large round sheet metal oil drums, the sheet metal on both sides of the welding area needs to be fixed in advance to avoid misalignment or gaps in the sheet metal during the welding process.

[0003] As shown in Chinese Patent Publication No. CN118060906A, a welding device for a large circular sheet metal oil drum includes a base and a lifting seat, the lifting seat being flexibly mounted on the base; a plate rolling assembly, mounted on the base, the plate rolling assembly including a lower pressure roller and an upper pressure roller, the lower pressure roller and the upper pressure roller being spaced apart; a positioning assembly, mounted on the lifting seat, the positioning assembly including a positioning roller and a support roller, the positioning roller and the support roller being spaced apart; and a sliding plate, slidably mounted on the lifting seat, on which a welding machine is mounted, the welding machine facing the side closer to the positioning roller. However, in actual use, the following shortcomings still exist:

[0004] In actual use, the large circular iron sheet oil drum welding equipment of the above-mentioned patent uses a rod-shaped component to clamp the welding part. During the welding process, the iron sheet will deform slightly due to the high temperature. However, the contact area between the rod-shaped component and the iron sheet is too small, and it cannot effectively support the iron sheet when it deforms. The positioning ability is insufficient, which causes the welding part of the iron sheet to deform during the welding process, resulting in an irregular state at the weld. Utility Model Content

[0005] To address the issue of insufficient support, this application provides a positioning mechanism for welding large circular sheet metal oil drums.

[0006] The positioning mechanism for welding large circular sheet metal oil drums provided in this application adopts the following technical solution:

[0007] A positioning mechanism for welding large circular sheet metal oil drums includes a mechanism support, a base fixedly connected to the bottom of the mechanism support, and an adjustable positioning mechanism provided on the top of the mechanism support.

[0008] The adjustable positioning mechanism includes a sliding frame disposed on the top of the mechanism support. A connecting arm is fixedly disposed on the side wall of the sliding frame. A fixing plate is disposed on the side wall of the sliding frame. A second limiting plate is disposed on one side of the sliding frame. A threaded rod is disposed on one side of the second limiting plate. A knob is fixedly disposed at one end of the threaded rod. A rotating column is rotatably disposed on the side wall of the second limiting plate. A rotating plate is fixedly disposed on one side of the rotating column. A clamping member is movably disposed on the side wall of the rotating plate. A rotating disk is fixedly disposed at one end of the rotating column. A fixing disk is disposed on the side of the rotating disk away from the rotating column. A spring is disposed on the side of the fixing disk away from the rotating disk.

[0009] By adopting the above technical solution, the outer wall of the first limiting plate is in contact with the inner wall of the sliding seat, thereby limiting the first limiting plate by the sliding seat. Multiple rotating columns are vertically arranged, thereby allowing for better angle adjustment of the clamping components.

[0010] Preferably, the adjustable positioning mechanism further includes a sliding seat fixedly connected to the top of the mechanism support, the sliding frame slidably connected to the top of the sliding seat, a first limiting plate fixedly connected to the side wall of the sliding frame, a connecting member fixedly connected to the side wall of the sliding seat, a horizontal bar fixedly connected to the end of the connecting member away from the sliding seat, limiting strips fixedly connected to both ends of the horizontal bar, a splicing block fixedly connected to the inner wall of the sliding frame, the side wall of the sliding frame fixedly connected to the side wall of the connecting arm, both the upper and lower ends of the fixing plate being fixedly connected to the first limiting plate, a fixing block fixedly connected to the side of the fixing plate away from the sliding frame, a connecting block one fixedly connected to the side of the fixing block away from the fixing plate, a threaded rod one threaded through one side wall of the connecting block, a limiting block one movablely connected to a second limiting plate fixedly connected to one side wall of the connecting block, a limiting disc fixedly connected through one side wall of the threaded rod, and a horizontal plate movablely connected to the threaded rod one fixedly connected between the two second limiting plates.

[0011] By adopting the above technical solution, the connectors are symmetrically arranged to better support the crossbars. The two crossbars can be fixed together with bolts to avoid the problem of the mechanism moving on its own.

[0012] Preferably, the end of the knob one near the threaded rod one is fixedly connected to the threaded rod one, the rotating column moves through the side wall of the second limiting plate, the rotating plate is fixedly connected to the side wall of the rotating column, and the inner wall of the rotating plate is engaged with the clamping member.

[0013] By adopting the above technical solution, the rotating plate can engage both sides of the clamping component, thereby making the force on both sides more even when the clamping component is bent.

[0014] Preferably, a fixing frame is fixedly connected to the side wall of the second limiting plate, and one end of the rotating column near the fixing frame is fixedly connected to a smooth surface of the rotating disk, while the side of the rotating disk away from the rotating column is engaged with the fixing disk.

[0015] By adopting the above technical solution, the diameter of the rotating disk is kept consistent with the diameter of the rotating column, thereby making the connection more stable.

[0016] Preferably, a connecting ring is fixedly connected to the end of the fixed disk away from the rotating disk, the side of the connecting ring away from the fixed disk is fixedly connected to a spring, and the end of the spring away from the connecting ring is fixedly connected to a fixed frame.

[0017] By adopting the above technical solution, the connecting ring and the center of the fixed disk are kept in the same position, thus making the movement more stable.

[0018] Preferably, the side wall of the fixed frame is movably connected to a limiting shaft, the limiting shaft is movably connected to a rotating disk, the limiting shaft is movably connected to the fixed disk, the end of the limiting shaft near the rotating column is fixedly connected to the rotating column, and the spring is sleeved with the limiting shaft.

[0019] By adopting the above technical solution, the limiting shaft limits the connection ring and the fixed plate, so that the connection ring can only move horizontally.

[0020] Preferably, the limiting shaft movably passes through the connecting ring, and the side wall of the fixed plate is fixedly connected with a limiting block two that movably passes through the fixed frame.

[0021] By adopting the above technical solution, the second limiting block is square, thereby preventing the fixed disk from being rotated by the threaded rod second driven by the rotating disk first.

[0022] Preferably, a threaded rod 2 is threaded through the side wall of the connecting arm, a knob 2 is fixedly connected to one end of the threaded rod 2, a rotating disk is fixedly connected to the end of the threaded rod 2 away from the knob 2, a third limiting plate is fixedly connected to the inner wall of the connecting arm, a limiting block 3 is movably passed through the side wall of the third limiting plate, and a connecting block 2 is fixedly connected to the side wall of the limiting block 3 to achieve a fixed connection with the connecting block 1.

[0023] By adopting the above technical solution, the limiting block three is symmetrically arranged on both sides of the connecting block two, thereby limiting the connecting block two so that the connecting block two can only move horizontally.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By using a sliding frame to drive the connecting arm and the fixed plate to slide synchronously, the mechanism can be adjusted appropriately according to the length of the sheet metal, thereby improving the adaptability of the mechanism;

[0026] 2. By rotating knob one, the threaded rod one rotates, which in turn causes the second limit plate to move horizontally, thus causing the rotating plate to move horizontally synchronously. Then, the operator rotates the rotating column, which drives the rotating disk one to rotate. The rotating disk one, through the teeth on the side wall, drives the fixed disk to move horizontally, thereby compressing the spring. When it rotates to the appropriate angle, the fixed disk is pushed by the spring to fix the rotating disk one. By adjusting the multiple vertically arranged rotating plates, the shape of the clamping part is made consistent with the curvature of the oil drum. This ensures that the iron sheets at both ends of the welding part remain bent during welding, thus providing sufficient support for the iron sheets at the welding point and avoiding problems such as irregular drum shape and unsatisfactory quality. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the positioning mechanism used for welding large circular sheet metal oil drums in this application.

[0028] Figure 2 This is a view showing the overall structure of the positioning mechanism for welding large circular sheet metal oil drums, as presented in this application.

[0029] Figure 3 This is a partial view of the connecting part of the positioning mechanism used for welding large circular sheet metal oil drums in this application;

[0030] Figure 4 This is a partial view of the fixing block of the positioning mechanism used for welding large circular sheet metal oil drums in this application;

[0031] Figure 5 This is a partial view of a threaded rod of the positioning mechanism used for welding large circular sheet metal oil drums in this application;

[0032] Figure 6 This is a partial view of a rotating disk of the positioning mechanism used for welding large circular sheet metal oil drums in this application;

[0033] Figure 7 This is a partial view of the two threaded rods of the positioning mechanism used for welding large circular sheet metal oil drums in this application.

[0034] Figure label:

[0035] 1. Mechanism support; 11. Base;

[0036] 2. Adjustable positioning mechanism; 21. Sliding seat; 22. Sliding frame; 23. First limiting plate; 24. Connecting piece; 25. Crossbar; 26. Limiting bar; 27. Splicing block; 28. Connecting arm; 29. ​​Fixing plate; 210. Fixing block;

[0037] 211. Connecting block 1; 212. Second limiting plate; 213. Threaded rod 1; 214. Limiting block 1; 215. Limiting disc; 216. Horizontal plate; 217. Knob 1; 218. Rotating column; 219. Rotating plate; 220. Clamping component;

[0038] 221. Fixed frame; 222. Rotating disk one; 223. Fixed disk; 224. Connecting ring; 225. Spring; 226. Limiting shaft; 227. Limiting block two; 228. Threaded rod two; 229. Knob two; 230. Rotating disk; 231. Third limiting plate; 232. Limiting block three; 233. Connecting block two. Detailed Implementation

[0039] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0040] This application discloses a positioning mechanism for welding large circular sheet metal oil drums.

[0041] Reference Figure 1 A positioning mechanism for welding large circular iron oil drums includes a mechanism support 1, a base 11 fixedly connected to the bottom of the mechanism support 1, and an adjustable positioning mechanism 2 provided on the top of the mechanism support 1.

[0042] The staff placed the base 11 stably on the ground and moved one side of the adjustable positioning mechanism 2 toward the iron sheet welding part to facilitate the subsequent welding of the iron sheet.

[0043] Reference Figure 2 The adjustable positioning mechanism 2 includes a sliding frame 22 disposed on the top of the mechanism support 1, a connecting arm 28 fixedly disposed on the side wall of the sliding frame 22, a fixing plate 29 disposed on the side wall of the sliding frame 22, a second limiting plate 212 disposed on one side of the sliding frame 22, a threaded rod 213 disposed on one side of the second limiting plate 212, a knob 217 fixedly disposed on one end of the threaded rod 213, a rotating column 218 rotatably disposed on the side wall of the second limiting plate 212, a rotating plate 219 fixedly disposed on one side of the rotating column 218, a clamping member 220 movably disposed on the side wall of the rotating plate 219, a rotating disk 222 fixedly disposed on one end of the rotating column 218, and a fixing disk 22... 3 is located on the side of the rotating disk 222 away from the rotating column 218, and the spring 225 is located on the side of the fixed disk 223 away from the rotating disk 222. The adjustable positioning mechanism 2 also includes a sliding seat 21 fixedly connected to the top of the mechanism support 1. A horizontal groove is opened on the top of the sliding frame 22, and the sliding seat 21 is slidably connected inside the horizontal groove, thereby realizing the sliding connection between the sliding frame 22 and the sliding seat 21. The first limiting plate 23 is fixedly connected to the side wall of the sliding frame 22. The outer wall of the first limiting plate 23 located at the bottom of the sliding frame 22 fits against the inner wall of the horizontal groove, thereby allowing the sliding seat 21 to simultaneously limit the sliding frame 22 and the first limiting plate 23.

[0044] The staff first moved the sliding frames 22 on both sides horizontally to make the sheet metal closer to the horizontal bar 25.

[0045] Reference Figure 3 The connector 24 is fixedly connected to the side wall of the sliding seat 21. The connector 24 is L-shaped, which facilitates the fixing of the horizontal bar 25. The horizontal bar 25 is fixedly connected to the end of the connector 24 away from the sliding seat 21. The limiting strip 26 is fixedly connected to both ends of the horizontal bar 25. The side wall of the limiting strip 26 is in contact with the inner wall of the sliding frame 22. The side of the limiting strip 26 near the first limiting plate 23 is in contact with the first limiting plate 23, thereby further limiting the horizontal movement of the sliding frame 22 through the limiting strip 26. The splicing block 27 is fixedly connected to the inner wall of the sliding frame 22. The side of the splicing block 27 near the horizontal bar 25 is in contact with the horizontal bar 25, thereby making the movement more stable. The side of the moving frame 22 closest to the connecting arm 28 is fixedly connected to the side wall of the connecting arm 28. The upper and lower ends of the fixing plate 29 are fixedly connected to the side of the first limiting plate 23 closest to the fixing plate 29, so that when the sliding frame 22 moves, it will drive the fixing plate 29 to move synchronously. The side of the fixing plate 29 away from the sliding frame 22 is fixedly connected to the end of the fixing block 210 closest to the fixing plate 29, so that the fixing block 210 and the fixing plate 29 move synchronously. The side of the fixing block 210 away from the fixing plate 29 is fixedly connected to multiple connecting blocks 211. The connecting blocks 211 are vertically arranged, so that the force on the sheet metal is more even.

[0046] The staff then move the sliding frames 22 on both sides toward the center, thereby driving the connecting arms 28 on both sides to move toward the center, so that the two sides of the sheet metal are located on the inner wall of the adjustable positioning mechanism 2, which facilitates subsequent clamping.

[0047] Reference Figure 4A threaded hole is provided on the side wall of connecting block 211, and threaded rod 213 is threaded through the threaded hole, thereby achieving a threaded connection between threaded rod 213 and connecting block 211. The side wall of connecting block 211 is fixedly connected to the end of limiting block 214 near connecting block 211. A sliding groove is provided through the side wall of second limiting plate 212, and limiting block 214 is movably connected through the sliding groove, thereby achieving a slidable connection between limiting block 214 and second limiting plate 212. A circular hole is provided through the side wall of limiting disc 215, and threaded rod 213 is fixedly connected through the circular hole, thereby allowing limiting disc 215 to move horizontally with threaded rod 213. The horizontal plate 216 is fixedly connected between two second limiting plates 212. A threaded hole 213 is provided through the side wall of the horizontal plate 216. The threaded rod 213 moves through the threaded hole 2, so that the threaded rod 213 and the horizontal plate 216 are threadedly connected. The limiting plate 215 and the knob 217 clamp the horizontal plate 216, so that when the threaded rod 213 moves horizontally, the horizontal plate 216 moves synchronously through the limiting plate 215 or the knob 217. The threaded rod 213 is fixedly connected to the end of the knob 217 near the threaded rod 213, so that the knob 217 drives the threaded rod 213 to rotate.

[0048] The operator then rotates knob 217, which in turn rotates threaded rod 213. Threaded rod 213 moves horizontally, and through knob 217 or limit plate 215, drives horizontal plate 216 to move horizontally. Next, horizontal plate 216 drives second limit plate 212 to move horizontally, which in turn drives rotating column 218 to move horizontally. Rotating column 218 further drives rotating plate 219 to move horizontally synchronously, and rotating plate 219 ultimately causes the upper or lower end of clamping member 220 to bend.

[0049] Reference Figure 5The second limiting plate 212 has a through-hole 2 on its side wall, through which the rotating column 218 moves movably, thereby achieving a rotatable connection between the rotating column 218 and the clamping member 220. The rotating plate 219 is fixedly connected to the side of the rotating column 218 away from the knob 217. The inner wall of the rotating plate 219 has a vertical slot, and the clamping member 220 is engaged in the vertical slot, thereby achieving a engagement between the clamping member 220 and the rotating plate 219. The clamping member 220 is made of aramid fiber composite material, which has the advantages of high temperature resistance and easy bending, making it suitable for clamping sheet metal during welding. The fixing frame 221 is fixedly connected to the second limiting plate. On the side wall 212, one end of the rotating column 218 near the fixed frame 221 is fixedly connected to the side of the rotating disk 222 near the rotating column 218, so that the rotating disk 222 and the rotating column 218 rotate synchronously. The teeth on the side of the rotating disk 222 away from the rotating column 218 are engaged with the side of the fixed disk 223 near the rotating disk 222. The end of the fixed disk 223 away from the rotating disk 222 is fixedly connected to the side of the connecting ring 224 near the fixed disk 223. The side of the connecting ring 224 away from the fixed disk 223 is fixedly connected to the end of the spring 225 near the connecting ring 224.

[0050] Then, the operator rotates the threaded rod 228, which drives the rotating disk 222 to rotate. The rotating disk 222 causes the fixed disk 223 to slide away from the rotating disk 222. The connecting ring 224 slides synchronously with the fixed disk 223, and the spring 225 is compressed. When the rotating column 218 rotates to the appropriate position, the teeth of the fixed disk 223 align with the teeth on the side wall of the rotating disk 222 again. The connecting ring 224 is pushed by the compression force of the spring 225, causing the fixed disk 223 to move closer to the rotating disk 222, thereby completing the locking of the rotating disk 222.

[0051] Reference Figure 6The end of spring 225 away from connecting ring 224 is fixedly connected to the end of fixed frame 221 near spring 225, so that when connecting ring 224 is driven by fixed plate 223 to move horizontally, spring 225 will be compressed. A circular hole three is provided through the side wall of fixed frame 221, and limiting shaft 226 moves through circular hole three, thus allowing fixed frame 221 and limiting shaft 226 to be rotatably connected. A circular hole four is provided through the side wall of rotating plate 222, and limiting shaft 226 moves through circular hole four, thus allowing rotating plate 222 and limiting shaft 226 to be rotatably connected. The fixed disk 223 has a circular hole 5 through its side wall, and the limiting shaft 226 moves through the circular hole 5, so that the fixed disk 223 and the limiting shaft 226 are rotatably connected. The end of the limiting shaft 226 near the rotating column 218 is fixedly connected to the side wall of the rotating column 218, so that the limiting shaft 226 and the rotating column 218 rotate synchronously. The spring 225 is sleeved on the outer wall of the limiting shaft 226. The connecting ring 224 has a circular hole 6 through its side wall, and the limiting shaft 226 moves through the circular hole 6, so that the connecting ring 224 and the limiting shaft 226 are slidably connected.

[0052] This locking further locks the rotating column 218, so that with the cooperation of multiple rotating plates 219, the clamping member 220 is bent into a shape consistent with the arc size of the iron barrel, thereby fixing the arc-shaped iron sheet.

[0053] Reference Figure 7 The side wall of the fixed disk 223 is fixedly connected to the second limiting block 227. The side wall of the fixed frame 221 has a sliding groove 2 through which the second limiting block 227 moves through the second sliding groove, thereby making the second limiting block 227 and the fixed frame 221 slidably connected. The side wall of the connecting arm 28 has a threaded hole 3 through which the threaded rod 228 is threaded through the threaded hole 3, thereby making the connecting arm 28 and the threaded rod 228 threadedly connected. The second knob 229 is fixedly connected to one end of the threaded rod 228. The end of the threaded rod 228 away from the second knob 229 is fixedly connected to the rotating disk 230, thereby making the second knob 229... When 29 rotates, it will drive the rotating disk 230 to move horizontally. The third limiting plate 231 is fixedly connected to the inner wall of the connecting arm 28. The side wall of the third limiting plate 231 is provided with a sliding groove three. The limiting block three 232 moves through the sliding groove three, so that the limiting block three 232 and the third limiting plate 231 are slidably connected. The connecting block two 233 is fixedly connected to the side wall of the limiting block three 232. The side of the connecting block two 233 away from the rotating disk 230 is fixedly connected to the connecting block one 211. The side of the connecting block two 233 close to the rotating disk 230 is fixedly connected to the side of the rotating disk 230 close to the connecting block two 233.

[0054] Finally, the staff rotates knob 229, which drives threaded rod 228 to move horizontally. Threaded rod 228 then drives rotating disk 230 to move synchronously. Rotating disk 230 pushes connecting block 233 closer to the other side of the sheet metal, thereby clamping both sides of the sheet metal and further improving the stability during welding.

[0055] The implementation principle of the positioning mechanism for welding large circular iron sheet oil drums in this application embodiment is as follows:

[0056] The operator first unfolds the sliding frames 22 on both sides outwards to bring the sheet metal close to the horizontal bar 25, then moves them towards the center, causing the connecting arm 28 to center and making the sheet metal fit tightly against the inner wall of the adjustable positioning mechanism 2 for clamping. Next, the operator rotates knob 217, and through a series of interlocking movements, threaded rod 213, horizontal plate 216, second limit plate 212, rotating column 218, and rotating plate 219 are driven in sequence, ultimately causing the clamping part 220 to bend. Then, the operator rotates threaded rod 228 to rotate rotating disk 222. This causes the fixed plate 223 to slide, compressing the spring 225. When the rotating column 218 reaches the designated position, the fixed plate 223 and the rotating plate 222 teeth align. The spring 225 pushes the fixed plate 223 to lock the rotating plate 222, thereby locking the rotating column 218. This causes the clamping part 220 to bend into the arc of an iron barrel. Finally, the knob 229 is turned, causing the threaded rod 228 and the rotating plate 230 to move synchronously, pushing the connecting block 233 closer to the iron sheet to achieve clamping and improve welding stability.

[0057] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A positioning mechanism for welding large round sheet iron oil drums, comprising a mechanism support (1), the bottom of the mechanism support (1) is fixedly connected with a base (11), characterized in that: The mechanism support (1) top is provided with adjustable positioning mechanism (2); The adjustable positioning mechanism (2) further includes a sliding seat (21) fixedly connected with the top of the mechanism support (1), the sliding frame (22) is slidingly connected to the top of the sliding seat (21), the side wall of the sliding frame (22) is fixedly connected with a first limiting plate (23), the side wall of the sliding seat (21) is fixedly connected with a connecting piece (24), one end of the connecting piece (24) away from the sliding seat (21) is fixedly connected with a horizontal bar (25), the two ends of the horizontal bar (25) are fixedly connected with limiting strips (26), the inner wall of the sliding frame (22) is fixedly connected with splicing blocks (27), the side wall of the sliding frame (22) is fixedly connected with the side wall of the connecting arm (28), the upper and lower ends of the fixed plate (29) are fixedly connected with the first limiting plate (23), one side of the fixed plate (29) away from the sliding frame (22) is fixedly connected with a fixed block (210), one side of the fixed block (210) away from the fixed plate (29) is fixedly connected with a connecting block one (211), the side wall of the connecting block one (211) is screwedly penetrated with the threaded rod one (213), the side wall of the connecting block one (211) is fixedly connected with a limiting block one (214) movably penetrated with the second limiting plate (212), the side wall of the threaded rod one (213) is fixedly penetrated with a limiting disc (215), the two second limiting plates (212) are fixedly connected with a horizontal plate (216) movably penetrated with the threaded rod one (213).

2. A positioning mechanism for welding large round sheet iron oil drums as claimed in claim 1, wherein: The end of the knob one (217) close to the threaded rod one (213) is fixedly connected with the threaded rod one (213), the rotating column (218) movably penetrates the side wall of the second limiting plate (212), the rotating plate (219) is fixedly connected with the side wall of the rotating column (218), the inner wall of the rotating plate (219) is clamped with the clamping piece (220).

3. A positioning mechanism for welding large round sheet iron oil drums as claimed in claim 2, wherein: ​ 4. A positioning mechanism for welding large round sheet iron oil drums as claimed in claim 3, wherein: The second limiting plate (212) side wall fixedly connected with fixed frame (221), the rotating column (218) is close to fixed frame (221) one end and rotating disc one (222) smooth surface realizes fixed connection, the rotating disc one (222) is away from rotating column (218) one side and fixed disc (223) realizes meshing connection.

5. A positioning mechanism for welding large round sheet iron oil drums as claimed in claim 4, wherein: The fixed disc (223) is away from rotating disc one (222) one end fixedly connected with connecting ring (224), the connecting ring (224) is away from fixed disc (223) one side and spring (225) realizes fixed connection, the spring (225) is away from connecting ring (224) one end and fixed frame (221) realizes fixed connection.

6. A positioning mechanism for welding large round sheet iron oil drums as defined in claim 5, wherein: The fixed frame (221) side wall mobile through limiting shaft (226), the limiting shaft (226) mobile through rotating disc one (222), the limiting shaft (226) mobile through fixed disc (223), the limiting shaft (226) is close to rotating column (218) one end and rotating column (218) fixed connection, the spring (225) and limiting shaft (226) realize sleeve.

7. A positioning mechanism for welding large round sheet iron oil drums as defined in claim 6, wherein: The limiting shaft (226) mobile through connecting ring (224), the fixed disc (223) side wall fixedly connected with limiting block two (227) and realizes the mobile through of fixed frame (221).

8. A positioning mechanism for welding large round sheet iron oil drums as defined in claim 1, characterized in that: The connecting arm (28) side wall screw rod two (228) are screwed through, the screw rod two (228) one end fixedly connected with knob two (229), the screw rod two (228) are away from knob two (229) one end fixedly connected with rotating disc (230), the connecting arm (28) inner wall fixedly connected with third limiting plate (231), the third limiting plate (231) side wall mobile through limiting block three (232), the limiting block three (232) side wall fixedly connected with connecting block two (233) and realizes the fixed connection of connecting block one (211).

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