Rotary clamping mechanism for pipe welding

Abstract

This invention provides a rotary clamping mechanism for pipe welding, suitable for clamping pipes to be welded during the welding process of inner liner. The rotary clamping mechanism includes a main body for clamping pipes of different radii. To avoid hard damage to the cutting tool during turning due to large differences in product flatness or poor concentricity, as is common in existing technologies, this invention also includes a rotary clamping mechanism with controllable maximum rotational torque. A rotating gear ring is tightly abutted against the clamping component mounting plate, and the rotational torque is transmitted between the rotating gear ring and the mounting plate through friction, preventing rigid damage during turning. This invention also includes a slidable, shuttle-mounted suction cup electromagnet that engages with the rotating gear ring through a through-hole. After turning or other machining processes are completed, the rotational torque can be adjusted by driving the suction cup electromagnet.

Description

Technical Field

[0001] This invention belongs to the field of pressure vessel liner welding technology, and particularly relates to a rotary clamping mechanism for pipe welding. Background Technology

[0002] In the existing technology, pressure vessels generally use a traditional three-section welded inner liner structure. There are multiple weld seams on the contact surface between the pipe to be welded and the closed end. The pipe to be welded and the closed end are clamped with corresponding clamps and then welded. If welding defects such as weld deviation or incomplete penetration occur during the welding process, the weld seam will be very easy to corrode.

[0003] Currently, to improve process quality, the welding of inner liner pipes generally adopts fully automated production lines, eliminating human assembly errors and using robots for welding to ensure weld quality. However, existing pipe welding equipment uses two semicircles to clamp the pipe to be welded and the closed end in a clamping manner, and locks the two semicircles to achieve clamping and fixation. This clamping structure not only fails to meet the requirements of automated welding, but also, because the locking position is generally fixed, it is difficult to achieve continuous adjustment. Existing pipe welding equipment cannot tolerate product size deviations. In addition, after clamping the product, the existing pipe welding equipment cannot rotate. This not only reduces the working efficiency of the existing clamping components used for welding the inner liner of pressure vessels, leaving hidden dangers for subsequent fully automated welding processes, but also reduces welding quality due to its inability to adapt to different sizes of pipe parts to be welded and its inability to rotate during the automated welding process. This leads to welding defects such as weld deviation, unevenness, and incomplete penetration during the welding process.

[0004] Therefore, how to provide a clamping component that can automatically rotate and adaptively clamp the pipe to be welded during the welding process in conjunction with a fully automated pressure vessel liner welding production line has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] This invention provides a rotary clamping mechanism for pipe welding, which is suitable for clamping the pipe to be welded during the welding process of the inner liner; The rotary clamping mechanism is configured to clamp pipes of different radii for welding. The rotary clamping mechanism body includes a clamping mechanism shell, a drive structure, and a rotary clamping assembly. The rotary clamping assembly is disposed inside the clamping mechanism shell and is directly used to fix and clamp the pipes to be welded. The rotary clamping assembly includes a sheet metal mounting plate, a rotary bearing, a rotary gear ring, and a clamping assembly mounting plate, which are sequentially arranged inside the housing of the clamping mechanism. The clamping assembly mounting plate is provided with a plurality of rotary clamping blocks, each of which has an arc-shaped end on one side. The arc-shaped end faces of the plurality of rotary clamping blocks together form a clamping space, which is a cylindrical cavity. The cross-sectional radius of the cylindrical cavity is equal to the radius of the pipe to be welded.

[0006] Furthermore, the rotary clamping mechanism is a rotary clamping mechanism that can control the clamping torque. The rotary gear ring is in close contact with the clamping component mounting plate, and the rotary torque is transmitted between the rotary gear ring and the clamping component mounting plate through friction.

[0007] Furthermore, an electromagnet mounting plate and a suction cup electromagnet mounted on the electromagnet mounting plate are provided on the clamping assembly mounting plate. An electromagnet cover is provided on the outside of the electromagnet mounting plate and the suction cup electromagnet. An electromagnet through hole is provided on the clamping assembly mounting plate for the suction cup electromagnet to pass through. The suction cup electromagnet can slide through the electromagnet through hole and contact the rotating gear ring to achieve cooperation.

[0008] Furthermore, the rotary clamping assembly also includes a rotary positioning block, which is fixedly disposed inside the housing of the clamping mechanism by a positioning plate.

[0009] Furthermore, the rotary positioning block also includes a drive motor fixedly mounted on the positioning plate. The output end of the drive motor is fixedly connected to the short side of the L-shaped positioning sliding plate. The positioning insert is fixedly mounted on the L-shaped positioning sliding plate and protrudes from the bottom end of the L-shaped positioning sliding plate.

[0010] Furthermore, each of the rotating clamping blocks can move along the radial direction of the pipe to be welded on the clamping assembly mounting plate to adjust the inner diameter of the cylindrical structure cavity of the clamping space to be equal to the radius of the pipe to be welded.

[0011] Furthermore, there are six rotating clamping blocks, which are evenly distributed on the clamping assembly mounting plate. Each rotating clamping block includes a rotating clamping mounting block and a rotating clamping fixing block.

[0012] Furthermore, the rotary clamping fixing block is fixedly mounted on the rotary clamping mounting block, and the rotary clamping mounting block is slidably mounted on the clamping assembly mounting plate. The rotary clamping mounting block drives the rotary clamping fixing block to move radially along the pipe to be welded.

[0013] Furthermore, the rotary clamping mechanism also includes a clamping drive structure; the clamping drive structure includes a clamping follower mounting seat fixedly disposed on the rotary clamping mounting block and a retractable clamping follower body fixedly disposed on the clamping follower mounting seat.

[0014] Furthermore, the rotating gear ring is provided with an inclined follower groove, and the clamping follower body is slidably disposed in the follower groove. By moving the clamping follower body in the follower groove, the radial distance of the clamping follower body relative to the axis of the rotating gear ring can be changed.

[0015] Furthermore, a position sensor is also provided on the housing of the clamping mechanism. The position sensor is located on the housing of the clamping mechanism corresponding to the position of the rotary clamping mounting block. The position sensor is located on the outer side of the rotary clamping mounting block on the side away from the pipe to be welded.

[0016] Furthermore, the rotary clamping mechanism for pipe welding also includes a slide mounting plate mounted on the frame of the inner liner welding equipment, a rotary clamping mechanism body mounted on the slide mounting plate, and an upper mounting structure mounted on the top of the rotary clamping mechanism body. The rotary clamping mechanism body is fixedly mounted on the slide mounting plate via a clamping mechanism base.

[0017] Furthermore, the frame of the inner liner welding equipment includes a gantry frame and a base frame.

[0018] Furthermore, the base frame is disposed at the bottom of the main body of the rotary clamping mechanism and cooperates with the slide mounting plate, and the gantry frame is disposed at the top of the main body of the rotary clamping mechanism and cooperates with the upper mounting structure.

[0019] Furthermore, the clamping mechanism housing is fixedly mounted on the slide mounting plate via the clamping mechanism base, and the rotary clamping assembly is disposed inside the clamping mechanism housing and is directly used to fix and clamp the pipe to be welded.

[0020] Furthermore, the positioning plug is disposed at a corresponding position on the periphery of the clamping component mounting plate, and the clamping component mounting plate is provided with a socket for engaging with the positioning plug.

[0021] Furthermore, the drive structure drives the rotating gear ring to rotate by driving the pulley and belt to rotate, and the belt is a synchronous toothed belt that surrounds the outer ring of the rotating gear ring.

[0022] Furthermore, after the positioning block is inserted into the socket, it can stop the clamping assembly mounting plate from rotating with the rotating gear ring.

[0023] The beneficial effects of this invention are: (1) The rotary clamping mechanism of the present invention has two working conditions, namely the first state and the second state. When it is in the first state, the clamping component mounting plate is fixed relative to the rotating positioning block, the rotary gear ring can rotate independently, and drive the rotary clamping block to slide radially relative to the clamping component mounting plate, thereby achieving clamping or loosening. In the second state, the clamping component mounting plate and the rotary gear ring are fixed relative to each other by a suction cup electromagnet, the rotary gear ring can drive the clamping component mounting plate to rotate together, and then the tube is rotated by the rotary clamping block. The rotary gear ring with a planar cam connecting rod and a disc-shaped rotary gear ring and the closely related clamping component mounting plate and rotary clamping block are used in conjunction with an electromagnetic clutch containing a suction cup electromagnet to control the engagement state of the clamping component mounting plate and the rotary gear ring, thereby realizing the joint control of the clamping and rotation of the product by the mechanism, and the structure is simple. (2) The present invention uses a rotating clamping mechanism to clamp pipes of different radii. The rotating clamping mechanism includes six rotating clamping blocks. The rotating clamping mounting blocks are slidably mounted on the clamping assembly mounting plate. The rotating clamping mounting blocks drive the six rotating clamping blocks to move along the radial direction of the pipe to be welded, thereby clamping the pipe to be welded. The clamping mechanism can continuously adjust the clamping space according to the actual radius change of the pipe to be welded, and has strong adaptability. (3) In order to avoid the hard damage to the cutting tool caused by the large difference in flatness or poor concentricity of the product during the turning process in the prior art, the present invention also provides a rotating clamping mechanism that can control the maximum rotational torque. The rotating gear ring and the clamping component mounting plate are in close contact, and the rotating gear ring and the clamping component mounting plate transmit the rotational torque through friction to avoid rigid damage during the turning process. (4) The present invention also provides a suction cup electromagnet that can be slidably shuttled inside the through hole of the electromagnet and cooperates with the rotating gear ring. The friction between the rotating gear ring and the clamping component mounting plate can be adjusted by sliding the suction cup electromagnet. After the machining process such as turning is completed, the rotation torque can be adjusted by driving the suction cup electromagnet. Attached Figure Description

[0024] Figure 1 This is an overall diagram of the tubular mechanical welding device; Figure 2 A partial enlargement of the tubular mechanical welding device after removing some of its structure. Figure 1 ; Figure 3 A partial enlargement of the tubular mechanical welding device after removing some of its structure. Figure 2 ; Figure 4 This is an overall view of the rotary clamping mechanism; Figure 5This is a front view of the rotary clamping mechanism; Figure 6 Rear view of the rotating clamping mechanism; Figure 7 A partial magnification of the rotating clamping mechanism after removing some of its structure. Figure 1 ; Figure 8 A partial magnification of the rotating clamping mechanism after removing some of its structure. Figure 2 ; Figure 9 A partial magnification of the rotating clamping mechanism after removing some of its structure. Figure 3 ; Figure 10 A partial magnification of the rotating clamping mechanism after removing some of its structure. Figure 4 ; Figure 11 This is a schematic diagram of the rotating gear ring. Figure 12 Enlarged view of the rotary clamping assembly Figure 1 ; Figure 13 Enlarged view of the rotary clamping assembly Figure 2 ; Figure 14 Enlarged view of the rotary clamping assembly Figure 3 ; Figure 15 This is a schematic diagram of the rotating positioning block. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "upper," "lower," "inner," "outer," and "middle," etc., used in the specification, claims, and accompanying drawings of this invention indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances. In addition, the term "multiple" should mean two or more.

[0027] like Figure 1-15 As shown, this embodiment provides a rotary clamping mechanism for pipe welding, which is part of a tubular mechanical welding device 100. The tubular mechanical welding device 100 includes a pipe 2000 to be welded and a closed end 2100 fixed by a clamping device 1000. A welding assembly 3000, a turning mechanism 7000, and an adaptive grinding mechanism 6000 are provided on one side of the pipe 2000 to be welded. The welding assembly 3000 welds the weld between adjacent pipes 2000 to be welded and the closed end 2100. The turning mechanism 7000 and the adaptive grinding mechanism 6000 flatten the ends of the pipe 2000 to be welded, the ends of the closed end 2100, and the weld between them. The closed ends 2100 are welded to both ends of the pipe 2000 to be welded. The clamping device 1000 includes a clamping assembly 1100 for clamping the closed end 2100 and a rotary clamping mechanism 1200 for clamping the pipe 2000 to be welded.

[0028] It is worth noting that the rotary clamping mechanism 1200 of this embodiment is suitable for clamping the pipe 2000 to be welded during the welding process of the inner liner. That is, the two ends of the pipe 2000 to be welded are respectively arranged with closed ends 2100 to be welded. The rotary clamping mechanism 1200 is used to adapt to and clamp the pipe 2000 to be welded.

[0029] The clamping mechanism in the existing technology uses a manual locking method to clamp the pipe to be welded through a semi-circular clamping structure. After clamping the product, the product cannot rotate, which reduces the working efficiency of the existing clamping components for welding the inner liner of pressure vessels. At the same time, it is difficult to adapt to pipes of different radius sizes to be welded and cannot rotate in conjunction with the automatic welding process, which reduces the welding quality. This leads to welding defects such as weld deviation, unevenness, and incomplete penetration during the welding process.

[0030] To address the aforementioned problems in the prior art, the rotary clamping mechanism 1200 of this embodiment is further provided with a rotary clamping mechanism body 1220 for clamping pipes 2000 of different radii. The rotary clamping mechanism body 1220 includes a clamping mechanism housing 1121, a drive structure 1240, and a rotary clamping assembly 1250. The rotary clamping assembly 1250 is disposed within the clamping mechanism housing 1121 and is directly used to fix and clamp the pipes 2000 to be welded.

[0031] The rotary clamping assembly 1250 includes a sheet metal mounting plate 1251, a rotary bearing 1252, a rotary gear ring 1253, and a clamping assembly mounting plate 1254, which are sequentially arranged within the clamping mechanism housing 1121. The clamping assembly mounting plate 1254 is provided with a plurality of rotary clamping blocks 1255, each of which has an arc-shaped end 1257 on one side. The arc-shaped end faces of the plurality of rotary clamping blocks 1255 together form a clamping space 1256, which is a cylindrical cavity. The cross-sectional radius of the cylindrical cavity is equal to the radius of the pipe 2000 to be welded. The driving structure 1240 drives the rotary gear ring 1253 to rotate by rotating a drive pulley 1242 and a belt 1241. The belt 1241 is a synchronous toothed belt and surrounds the outer ring of the rotary gear ring 1253.

[0032] To achieve the flattening of the ends of the pipe to be welded 2000, the ends of the closed end 2100, and the weld between them, a turning mechanism 7000 and an adaptive grinding mechanism 6000 are generally set up. However, in order to avoid hard damage to the cutting tool due to excessive difference in product flatness or poor product concentricity during the turning process, it is necessary to use a rotary clamping mechanism that can control the maximum rotational torque, rather than manually locking the pipe to be welded 2000 by mechanical clamping with bolts or other mechanical means.

[0033] Based on this, this application provides a rotary clamping mechanism 1200 with controllable clamping torque. Specifically, the rotary gear ring 1253 is in close contact with the clamping component mounting plate 1254, and the rotary gear ring 1253 and the clamping component mounting plate 1254 transmit rotational torque through friction. By adjusting the friction between the rotary gear ring 1253 and the clamping component mounting plate 1254, rotary clamping with controllable clamping torque can be achieved. The aforementioned rotary clamping mechanism 1200 with controllable clamping torque can clamp the pipe to be welded 2000 with controllable maximum rotational torque when the turning mechanism 7000 and the adaptive grinding mechanism 6000 are working, avoiding hard damage to the turning mechanism 7000 and the adaptive grinding mechanism 6000 during operation.

[0034] Those skilled in the art will know that the friction between the rotating gear ring 1253 and the clamping assembly mounting plate 1254 can be adjusted by adjusting the tightness of the mounting between the rotating gear ring 1253 and the clamping assembly mounting plate 1254 or by specifically selecting the material between the friction mounting surfaces.

[0035] Furthermore, an electromagnet mounting plate 1281 and a suction cup electromagnet 1282 mounted on the electromagnet mounting plate 1281 are provided on the clamping assembly mounting plate 1254. An electromagnet cover 1284 is provided on the outside of the electromagnet mounting plate 1281 and the suction cup electromagnet 1282. An electromagnet through hole 1283 is provided on the clamping assembly mounting plate 1254 for the suction cup electromagnet 1282 to pass through. The suction cup electromagnet 1282 can slide through the electromagnet through hole 1283 and contact the rotating gear ring 1253 to cooperate. The sliding arrangement of the suction cup electromagnet 1282 can adjust the relationship between the rotating gear ring 1253 and the clamping assembly mounting plate 1281. The friction between 54; it can be understood that when the engagement between the suction cup electromagnet 1282 and the rotating gear ring 1253 is a mechanical plug-in engagement, the rotating gear ring 1253 and the clamping component mounting plate 1254 are relatively fixed, which can be understood as the friction between the rotating gear ring 1253 and the clamping component mounting plate 1254 being infinitely large. When the engagement between the suction cup electromagnet 1282 and the rotating gear ring 1253 is a contact friction engagement, the friction between the rotating gear ring 1253 and the clamping component mounting plate 1254 is equivalent to adding the friction between the suction cup electromagnet 1282 and the rotating gear ring 1253 to the original friction.

[0036] In this embodiment, the rotary clamping assembly 1250 further includes a rotary positioning block 1260. The rotary positioning block 1260 is fixedly disposed inside the clamping mechanism housing 1121 by a positioning plate 1261. The rotary positioning block 1260 also includes a drive motor 1262 fixedly disposed on the positioning plate 1261. The output end of the drive motor 1262 is fixedly connected to the short side of the L-shaped positioning sliding plate 1263. The positioning insert 1264 is fixedly disposed on the L-shaped positioning sliding plate 1263 and protrudes from the bottom end of the L-shaped positioning sliding plate 1263.

[0037] Preferably, the positioning plug 1264 is disposed at a corresponding position on the periphery of the clamping component mounting plate 1254, and the clamping component mounting plate 1254 is provided with a socket for engaging with the positioning plug 1264. After the positioning plug 1264 is inserted into the socket, the clamping component mounting plate 1254 can be stopped from rotating with the rotating gear ring 1253, thereby achieving the effect of rotational clutch in conjunction with the transmission of rotational torque.

[0038] In this embodiment, each of the rotary clamping blocks 1255 can move along the radial direction of the pipe to be welded 2000 on the clamping assembly mounting plate 1254 to adjust the inner diameter of the cylindrical cavity of the clamping space 12561156 to be equal to the radius of the pipe to be welded 2000. Multiple rotary clamping blocks 1255 with slidably arranged arc-shaped end faces are spliced ​​together to form a cylindrical cavity to clamp the pipe to be welded 2000. When the radius of the pipe to be welded 2000 is too large, the gap between the arc-shaped ends 1257 of the multiple rotary clamping blocks 1255 can be adjusted to expand the inner diameter of the clamping space 1256 formed by the multiple arc-shaped ends 1257, thereby allowing the rotary clamping assembly 1250 of this application to adapt to pipes 2000 with different radius sizes to be welded.

[0039] Preferably, there are six rotating clamping blocks 1255, which are evenly distributed on the clamping assembly mounting plate 1254. Each rotating clamping block 1255 includes a rotating clamping mounting block 1258 and a rotating clamping fixing block 1259. The rotating clamping fixing block 1259 is fixedly disposed on the rotating clamping mounting block 1258. The rotating clamping mounting block 1258 is slidably disposed on the clamping assembly mounting plate 1254. The rotating clamping mounting block 1258 drives the rotating clamping fixing block 1259 to move radially along the pipe 2000 to be welded.

[0040] Furthermore, to facilitate the radial movement of the rotary clamping block 1255 and to enable the rotary clamping block 1255 to clamp the pipe to be welded 2000 with a controllable torque, this application also provides a corresponding clamping drive structure 1270; the clamping drive structure 1270 includes a clamping follower mounting base 1271 fixedly mounted on the rotary clamping mounting block 1258 and a movable clamping follower body 1272 fixedly mounted on the clamping follower mounting base 1271, and the rotary gear ring 1253 has an inclined follower. The clamping follower body 1272 is slidably disposed in the sliding groove 1273. By moving the clamping follower body 1272 in the sliding groove 1273, the radial distance of the clamping follower body 1272 relative to the axis of the rotating gear ring 1253 can be changed. Thus, by rotating the rotating gear ring 1253 at a specific angle, the rotating clamping mounting block 1258 is driven to move a distance radially along the pipe 2000 to be welded, thereby making the clamping torque of the rotating clamping block 1255 controllable.

[0041] Through the above structural configuration, it can be seen that the rotary clamping mechanism in this embodiment has two working states, namely the first state and the second state. When the rotary clamping mechanism is in the first state, the clamping component mounting plate 1254 is relatively fixed by the rotary positioning block 1260, the rotary gear ring 1253 can rotate independently, and drive the rotary clamping block 1255 to slide radially relative to the clamping component mounting plate 1254, thereby achieving clamping or loosening. In the second state, the clamping component mounting plate 1254 and the rotary gear ring 1253 are relatively fixed by the suction cup electromagnet 1282, the rotary gear ring 1253 can drive the clamping component mounting plate 1254 to rotate together, and then the rotary clamping block 1255 carries the pipe 2000 to rotate.

[0042] Furthermore, a position sensor 1231 is also provided on the housing 1121 of the clamping mechanism. The position sensor 1231 is located on the housing 1121 of the clamping mechanism corresponding to the position of the rotary clamping mounting block 1258. The position sensor 1231 is located on the outer side of the end of the rotary clamping mounting block 1258 away from the pipe 2000 to be welded. The position sensor 1231 can measure the position of each rotary clamping mounting block 1258 when the rotary clamping mounting block 1258 rotates with the clamping assembly mounting plate 1254. By measuring the position of each rotary clamping mounting block 1258, the roundness and offset detection of different batches of products can be determined and compared, which helps to achieve accurate positioning.

[0043] The rotary clamping mechanism 1200 for pipe welding in this embodiment includes a slide mounting plate 1210 mounted on the frame 5000 of the inner liner welding equipment, a rotary clamping mechanism body 1220 mounted on the slide mounting plate 1210, and an upper mounting structure 1230 mounted on the top of the rotary clamping mechanism body 1220. By providing the slide mounting plate 1210 and the upper mounting structure 1230 at the upper and lower ends of the rotary clamping mechanism body 1220, the rotary clamping mechanism body 1220 can be moved and adjusted in position on the tubular mechanical welding device 100. The rotary clamping mechanism body 1220 is fixedly mounted on the slide mounting plate 1210 by a clamping mechanism base 1221.

[0044] Specifically, the inner liner welding equipment frame 5000 includes a gantry frame 5100 and a base frame 5200. The base frame 5200 is disposed at the bottom of the rotating clamping mechanism body 1220 and cooperates with the slide mounting plate 1210. The gantry frame 5100 is disposed at the top of the rotating clamping mechanism body 1220 and cooperates with the upper mounting structure 1230.

[0045] Furthermore, the main body 1220 of the rotary clamping mechanism includes a clamping mechanism housing 1121, a drive structure 1240, and a rotary clamping assembly 1250. The clamping mechanism housing 1121 is fixedly mounted on the slide mounting plate 1210 via the clamping mechanism base 1221. The rotary clamping assembly 1250 is disposed inside the clamping mechanism housing 1121 and is directly used to fix and clamp the pipe 2000 to be welded.

[0046] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotary clamping mechanism for pipe welding, the rotary clamping mechanism being suitable for clamping the pipe to be welded during the welding process; Its features are, The rotary clamping mechanism is configured to clamp pipes of different radii for welding. The rotary clamping mechanism body includes a clamping mechanism shell, a drive structure, and a rotary clamping assembly. The rotary clamping assembly is disposed inside the clamping mechanism shell and is directly used to fix and clamp the pipes to be welded. The rotary clamping assembly includes a sheet metal mounting plate, a rotary bearing, a rotary gear ring, and a clamping assembly mounting plate, which are sequentially arranged inside the housing of the clamping mechanism. The clamping assembly mounting plate is provided with a plurality of rotary clamping blocks, each of which has an arc-shaped end on one side. The arc-shaped end faces of the plurality of rotary clamping blocks together form a clamping space, which is a cylindrical cavity. The cross-sectional radius of the cylindrical cavity is equal to the radius of the pipe to be welded. The rotary clamping mechanism has two working states: a first state and a second state. In the first state, the clamping component mounting plate is fixed relative to the clamping component mounting plate by a rotary positioning block. The rotary gear ring can rotate independently and drive the rotary clamping block to slide radially along the pipe to be welded relative to the clamping component mounting plate, thereby clamping or releasing the pipe to be welded. In the second state, the clamping component mounting plate and the rotary gear ring are fixed relative to each other by a suction cup electromagnet. The rotary gear ring can drive the clamping component mounting plate to rotate together, and then the rotary clamping block carries the pipe to be welded to rotate. The rotary clamping mechanism is a rotary clamping mechanism that can control the clamping torque. The rotary gear ring is in close contact with the clamping component mounting plate, and the rotary torque is transmitted between the rotary gear ring and the clamping component mounting plate through friction. An electromagnet mounting plate and a suction cup electromagnet mounted on the electromagnet mounting plate are provided on the clamping assembly mounting plate. An electromagnet cover is provided on the outside of the electromagnet mounting plate and the suction cup electromagnet. An electromagnet through hole is provided on the clamping assembly mounting plate for the suction cup electromagnet to pass through. The suction cup electromagnet can slide through the electromagnet through hole and contact the rotating gear ring to achieve cooperation. The rotary clamping assembly also includes a rotary positioning block, which is fixedly disposed inside the housing of the clamping mechanism by a positioning plate.

2. The rotary clamping mechanism for pipe welding according to claim 1, characterized in that, The rotary positioning block also includes a drive motor fixedly mounted on the positioning plate. The output end of the drive motor is fixedly connected to the short side of the L-shaped positioning sliding plate. The positioning insert is fixedly mounted on the L-shaped positioning sliding plate and protrudes from the bottom end of the L-shaped positioning sliding plate.

3. The rotary clamping mechanism for pipe welding according to claim 1, characterized in that, Each of the rotating clamping blocks can move along the radial direction of the pipe to be welded on the clamping assembly mounting plate to adjust the inner diameter of the cylindrical structure cavity of the clamping space to be equal to the radius of the pipe to be welded.

4. The rotary clamping mechanism for pipe welding according to claim 3, characterized in that, The number of rotating clamping blocks is six, and the six rotating clamping blocks are evenly distributed on the clamping assembly mounting plate. Each rotating clamping block includes a rotating clamping mounting block and a rotating clamping fixing block.

5. The rotary clamping mechanism for pipe welding according to claim 4, characterized in that, The rotary clamping fixing block is fixedly mounted on the rotary clamping mounting block, and the rotary clamping mounting block is slidably mounted on the clamping assembly mounting plate. The rotary clamping mounting block drives the rotary clamping fixing block to move radially along the pipe to be welded.

6. The rotary clamping mechanism for pipe welding according to claim 5, characterized in that, The rotary clamping mechanism further includes a clamping drive structure; the clamping drive structure includes a clamping follower mounting seat fixedly disposed on the rotary clamping mounting block and a retractable clamping follower body fixedly disposed on the clamping follower mounting seat.

7. The rotary clamping mechanism for pipe welding according to claim 6, characterized in that, The rotating gear ring has an inclined follower groove, and the clamping follower body is slidably disposed in the follower groove. By moving the clamping follower body in the follower groove, the radial distance of the clamping follower body relative to the axis of the rotating gear ring can be changed.

8. The rotary clamping mechanism for pipe welding according to claim 5, characterized in that, The clamping mechanism housing is also provided with a position sensor, which is located on the clamping mechanism housing at a position corresponding to the rotary clamping mounting block. The position sensor is located on the outer side of the rotary clamping mounting block on the side away from the pipe to be welded.

9. The rotary clamping mechanism for pipe welding according to claim 1, characterized in that, The rotary clamping mechanism for pipe welding also includes a slide mounting plate mounted on the frame of the inner liner welding equipment, a rotary clamping mechanism body mounted on the slide mounting plate, and an upper mounting structure mounted on the top of the rotary clamping mechanism body. The rotary clamping mechanism body is fixedly mounted on the slide mounting plate by a clamping mechanism base.

10. The rotary clamping mechanism for pipe welding according to claim 9, characterized in that, The frame of the inner liner welding equipment includes a gantry frame and a base frame.

11. The rotary clamping mechanism for pipe welding according to claim 10, characterized in that, The base frame is located at the bottom of the main body of the rotary clamping mechanism and is configured to cooperate with the slide mounting plate. The gantry frame is located at the top of the main body of the rotary clamping mechanism and is configured to cooperate with the upper mounting structure.

12. The rotary clamping mechanism for pipe welding according to claim 11, characterized in that, The clamping mechanism housing is fixedly mounted on the slide mounting plate via the clamping mechanism base. The rotary clamping assembly is disposed inside the clamping mechanism housing and is directly used to fix and clamp the pipe to be welded.

13. The rotary clamping mechanism for pipe welding according to claim 2, characterized in that, The positioning plug is located at a corresponding position on the periphery of the clamping component mounting plate, and the clamping component mounting plate is provided with a socket for the positioning plug to be inserted into.

14. The rotary clamping mechanism for pipe welding according to claim 1, characterized in that, The drive structure drives the rotating gear ring to rotate by driving pulleys and belts. The belt is a synchronous toothed belt and surrounds the outer ring of the rotating gear ring.

15. The rotary clamping mechanism for pipe welding according to claim 13, characterized in that, After the positioning plug is inserted into the socket, it can stop the clamping component mounting plate from rotating with the rotating gear ring.

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