Socket and spigot type flexible connector steel pipe bell and spigot forming production line and forming method

Abstract

The invention relates to the technical field of steel pipe connector forming, in particular to a bell and spigot type flexible connector steel pipe bell and spigot forming production line and method. In spigot forming equipment, all spigot forming modules are driven by a spigot forming driving mechanism to synchronously move towards the outer side in the radial direction of a spigot annular support; the rapid forming of the steel pipe socket can be easily completed; in the bell mouth forming equipment, an outer side forming driving mechanism drives all outer side forming modules to synchronously move towards the inner side in the radial direction of an outer side annular support, and an inner side forming driving mechanism drives all inner side forming modules to synchronously move towards the outer side in the radial direction of an inner side annular support. The rapid forming of the steel pipe socket can be completed; the forming machine is high in mechanization and automation degree, easy to operate and high in forming efficiency, the corresponding contours of the inner side forming module and the outer side forming module can be customized according to actual needs, and rapid forming of complex socket connectors of different structures can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe joint forming, and specifically to a socket and spigot forming production line and forming method for flexible socket joints of steel pipes. Background Art

[0002] In order to facilitate the connection of steel pipes for long-distance transportation, socket steel pipes have emerged as the times require. One of the pipe ends of the socket steel pipe is provided with a socket, and the other pipe end is provided with a spigot. When forming a conveying pipeline, the spigot of the previous steel pipe is inserted into the socket of the next steel pipe, and the convenient connection of the steel pipes can be realized. In the existing socket forming equipment for socket steel pipes, a socket pressing groove is formed between the upper roller mechanism and the lower roller mechanism. The upper roller mechanism is driven by a driving mechanism to rotate, driving the steel pipe and the lower roller mechanism to rotate, so that one end of the steel pipe forms a socket under the pressing action of the socket pressing groove. This equipment forms the socket by the method of rotary grooving. It can form a socket with a simple structure. However, for a complex socket with multiple uneven inner diameters with concavities and convexities, it is difficult to form or needs to be pressed by adjusting the grooving multiple times to form, the operation is troublesome, and the rotary grooving forming takes a long time and the production efficiency is low. Summary of the Invention

[0003] The purpose of the present invention is to provide a socket and spigot forming production line and forming method for flexible socket joints of steel pipes, so as to solve the problems of troublesome operation and low production efficiency caused by the need to adjust the pressing groove multiple times for pressing when the existing steel pipe socket joint forming equipment processes complex socket joint forming.

[0004] To solve the above problems, the present invention provides the following technical solutions: A socket and spigot forming production line for flexible socket joints of steel pipes includes a conveying track, a transfer device arranged on the conveying track, a spigot forming device arranged on one side of the conveying track, and a socket forming device arranged on the other side of the conveying track. The spigot forming device and the socket forming device are arranged at intervals along the extension direction of the conveying track; The spigot forming device includes a spigot annular bracket, a spigot forming module group, and a spigot forming driving mechanism. The spigot forming module group is coaxial with the spigot annular bracket. The spigot forming module group includes a plurality of spigot forming modules arranged in a circumferential array along the spigot annular bracket. The spigot forming driving mechanism is connected to the spigot forming module group to drive each of the spigot forming modules to move synchronously inward or outward along the radial direction of the spigot annular bracket; The socket forming device includes a socket outer side forming device, a socket inner side forming device, and a rotating device. The rotating device is connected to the socket inner side forming device to drive the socket inner side forming device to rotate relative to the socket outer side forming device. The socket outer side forming device includes an outer annular support, an outer forming module, and an outer forming driving mechanism. The outer forming module is coaxial with the outer annular support. The outer forming module includes a plurality of outer forming modules arranged in a circumferential array along the outer annular support. The outer forming driving mechanism is connected to the outer forming module to drive each of the outer forming modules to move synchronously inward or outward along the radial direction of the outer annular support. The socket inner side forming device includes an inner annular support, an inner forming module, and an inner forming driving mechanism. The inner forming module is disposed inside the outer forming module to form a socket forming cavity between the inner forming module and the outer forming module. The inner forming module is coaxial with the outer forming module and the inner annular support. The inner forming module includes a plurality of inner forming modules arranged in a circumferential array along the inner annular support. The inner forming driving mechanism is connected to the inner forming module to drive each of the inner forming modules to move synchronously inward or outward along the radial direction of the inner annular support.

[0005] For the socket and spigot flexible joint steel pipe socket forming production line as described above, the outer forming driving mechanism includes an outer forming driving seat and an outer forming driving component. The outer forming driving seat is disposed outside the outer forming module and is coaxially connected to the outer forming module. A driving seat inner conical surface is provided inside the outer forming driving seat. A module outer conical surface that cooperates with the driving seat inner conical surface is provided outside the outer forming module. The outer forming driving component connects the outer forming driving seat and the outer annular support to drive the outer forming driving seat to move axially relative to the outer annular support and drive each of the outer forming modules to move synchronously along the radial direction of the outer annular support.

[0006] For the socket and spigot flexible joint steel pipe socket and spigot forming production line as described above, an outer conical surface matching structure is provided between the outer forming driving seat and the outer forming module. The outer conical surface matching structure includes an outer second chute extending along the extension direction of the outer conical surface of the module and an outer second slider matching with the outer second chute. The outer second chute is provided on either the outer forming driving seat or the outer forming module, and the outer second slider is provided on the other of the outer forming driving seat and the outer forming module; an outer radial matching structure is provided between the outer annular bracket and the outer forming module. The outer radial matching structure includes an outer first chute extending along the radial direction of the outer annular bracket and an outer first slider matching with the outer first chute. The outer first chute is provided on either the outer annular bracket or the outer forming module, and the outer first slider is provided on the other of the outer annular bracket and the outer forming module.

[0007] For the socket and spigot flexible joint steel pipe socket and spigot forming production line as described above, the inner forming driving mechanism includes an inner forming cone and an inner forming driving component. The inner forming cone is arranged inside the inner forming module and is coaxially connected with the inner forming module. An outer conical surface of the cone is provided on the outer side of the inner forming cone, and an inner conical surface of the module matching with the outer conical surface of the cone is provided inside the inner forming module. The inner forming driving component connects the inner forming cone and the inner annular bracket to drive the inner forming cone to move axially relative to the inner annular bracket and drive each of the inner forming modules to move synchronously along the radial direction of the inner annular bracket.

[0008] For the socket and spigot flexible joint steel pipe socket and spigot forming production line as described above, an inner conical surface matching structure is provided between the inner forming cone and the inner forming module. The inner conical surface matching structure includes an inner second chute extending along the extension direction of the outer conical surface of the cone and an inner second slider matching with the inner second chute. The inner second chute is provided on either the inner forming cone or the inner forming module, and the inner second slider is provided on the other of the inner forming cone and the inner forming module; an inner radial matching structure is provided between the inner annular bracket and the inner forming module. The inner radial matching structure includes an inner first chute extending along the radial direction of the inner annular bracket and an inner first slider matching with the inner first chute. The inner first chute is provided on either the inner annular bracket or the inner forming module, and the inner first slider is provided on the other of the inner annular bracket and the inner forming module.

[0009] The socket and spigot flexible joint steel pipe socket and spigot forming production line as described above, the socket forming device further includes a transfer device, the transfer device includes a transfer guide rail, a transfer sliding seat and a transfer driving component, the length direction of the transfer guide rail is parallel to the axial direction of the outer annular bracket, the transfer sliding seat is movably arranged on the transfer guide rail and is connected to the outer socket forming device, and the transfer driving component is connected to the transfer sliding seat to drive the transfer sliding seat to drive the outer socket forming device to move along the transfer guide rail.

[0010] The socket and spigot flexible joint steel pipe socket and spigot forming production line as described above, the socket forming driving mechanism includes a socket forming cone and a socket forming driving component, the socket forming cone is arranged inside the socket forming module and is coaxially connected to the socket forming module, an outer socket cone surface is arranged on the outer side of the socket forming cone, an inner socket cone surface matched with the outer socket cone surface is arranged inside the socket forming module, and the socket forming driving component connects the socket forming cone and the socket annular bracket to drive the socket forming cone to move axially relative to the socket annular bracket and drive each socket forming module to synchronously move along the radial direction of the socket annular bracket.

[0011] The socket and spigot flexible joint steel pipe socket and spigot forming production line as described above, a socket cone surface matching structure is arranged between the socket forming cone and the socket forming module, the socket cone surface matching structure includes a second socket chute extending along the extending direction of the outer socket cone surface and a second socket slider matched with the second socket chute, the second socket chute is arranged on any one of the socket forming cone and the socket forming module, and the second socket slider is arranged on the other one of the socket forming cone and the socket forming module; a radial socket matching structure is arranged between the socket annular bracket and the socket forming module, the radial socket matching structure includes a first socket chute extending along the radial direction of the socket annular bracket and a first socket slider matched with the first socket chute, the first socket chute is arranged on any one of the socket annular bracket and the socket forming module, and the first socket slider is arranged on the other one of the socket annular bracket and the socket forming module.

[0012] The socket and spigot flexible joint steel pipe socket and spigot forming production line as described above, an annular limiting plate is arranged on the socket annular bracket, a limiting cone surface is arranged inside the annular limiting plate, and the diameter of the limiting cone surface gradually increases along the axial direction from the end far away from the socket forming module to the end close to the socket forming module.

[0013] The socket and spigot forming method of the socket and spigot flexible joint steel pipe is applied to the socket and spigot forming production line of the socket and spigot flexible joint steel pipe as described above, and includes the following steps: S1. The transfer device drives the steel pipe to move along the conveying track to the socket forming device; S2. Socket forming: The socket forming driving mechanism drives each of the socket forming modules to synchronously move radially outward along the socket annular bracket to a specified position, so that the steel pipe completes socket forming; S3. Socket demolding: The socket forming driving mechanism drives each of the socket forming modules to synchronously move radially inward along the socket annular bracket to the initial position, so that the socket forming module disengages from the steel pipe; S4. The transfer device drives the steel pipe to move along the conveying track to the spigot forming device; S5. First spigot forming: The outer forming driving mechanism in the outer spigot forming device drives each outer forming module to synchronously move radially inward along the outer annular bracket to a specified position; the inner forming driving mechanism in the inner spigot forming device drives each inner forming module to synchronously move radially outward along the inner annular bracket to a specified position; so that the steel pipe completes the first spigot forming in the spigot forming cavity between the outer forming module and the inner forming module; S6. Second spigot forming: The inner forming driving mechanism in the inner spigot forming device drives each inner forming module to synchronously move radially inward along the inner annular bracket to the initial position, so that the inner forming module disengages from the steel pipe; the rotating device drives the inner spigot forming device to rotate a specified angle relative to the outer spigot forming device; the inner forming driving mechanism in the inner spigot forming device drives each inner forming module to synchronously move radially outward along the inner annular bracket to a specified position; so that the steel pipe completes the second spigot forming in the spigot forming cavity between the outer forming module and the inner forming module; S7. Spigot demolding: The inner forming driving mechanism in the inner spigot forming device drives each inner forming module to synchronously move radially inward along the inner annular bracket to the initial position, so that the inner forming module disengages from the steel pipe; the outer forming driving mechanism in the outer spigot forming device drives each outer forming module to synchronously move radially outward along the outer annular bracket to the initial position, so that the outer forming module disengages from the steel pipe.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The socket-forming production line and forming method for the socket and spigot of a socket-and-spigot flexible joint steel pipe provided by the present invention can easily complete the rapid forming of the steel pipe socket by driving each socket-forming module to synchronously move outward along the radial direction of the socket annular bracket in the socket-forming device. In the spigot-forming device, by driving each outer forming module to synchronously move inward along the radial direction of the outer annular bracket through the outer forming driving mechanism and driving each inner forming module to synchronously move outward along the radial direction of the inner annular bracket through the inner forming driving mechanism, the rapid forming of the steel pipe spigot can be completed. It has a high degree of mechanization and automation, simple operation, high forming efficiency, and the inner forming module and the outer forming module can be customized with corresponding profiles according to actual needs, which can meet the rapid forming of complex socket-and-spigot joints with different structures.

[0015] 2. The socket-and-spigot forming production line and forming method for the socket and spigot of a socket-and-spigot flexible joint steel pipe provided by the present invention can drive the inner spigot-forming device to rotate relative to the outer spigot-forming device through the rotating device after the first forming of the spigot is completed, change the relative positions of the inner forming module and the outer forming module, and then complete the second forming of the spigot, so as to effectively eliminate the grooves and protrusions generated in the first forming and obtain a better forming effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the socket-and-spigot forming production line for the socket and spigot of a socket-and-spigot flexible joint steel pipe according to an embodiment of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the socket-forming device in the socket-and-spigot forming production line for the socket and spigot of a socket-and-spigot flexible joint steel pipe according to an embodiment of the present invention.

[0019] Figure 3 It is a partial structural decomposition diagram of the socket-forming device in the socket-and-spigot forming production line for the socket and spigot of a socket-and-spigot flexible joint steel pipe according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic structural diagram of the spigot-forming device in the socket-and-spigot forming production line for the socket and spigot of a socket-and-spigot flexible joint steel pipe according to an embodiment of the present invention.

[0021] Figure 5 It is a partial structural schematic diagram of the spigot-forming device in the socket-and-spigot forming production line for the socket and spigot of a socket-and-spigot flexible joint steel pipe according to an embodiment of the present invention. Figure 1 。

[0022] Figure 6 Partial structural schematic diagram of the socket forming device in the socket and spigot forming production line of the socket and spigot flexible joint steel pipe according to the embodiment of the present invention Figure 2 .

[0023] Figure 7 Exploded view of the inner socket forming device of the socket forming device in the socket and spigot forming production line of the socket and spigot flexible joint steel pipe according to the embodiment of the present invention.

[0024] Figure 8 Structural schematic diagram of the outer socket forming device of the socket forming device in the socket and spigot forming production line of the socket and spigot flexible joint steel pipe according to the embodiment of the present invention.

[0025] Figure 9 Exploded view of the outer socket forming device of the socket forming device in the socket and spigot forming production line of the socket and spigot flexible joint steel pipe according to the embodiment of the present invention.

[0026] Among them, the corresponding numbers of the reference numerals are as follows: 100, conveying track; 200, transfer equipment; 300, spigot forming equipment; 301, first spigot chute; 302, first spigot slider; 303, second spigot chute; 304, second spigot slider; 31, spigot annular bracket; 311, annular limiting plate; 312, limiting conical surface; 32, spigot forming module; 321, inner spigot conical surface; 33, spigot forming cone; 331, outer spigot conical surface; 34, spigot forming drive assembly; 400, socket forming equipment; 401, first outer chute; 402, first outer slider; 403, second outer chute; 404, second outer slider; 405, first inner chute; 406, first inner slider; 407, second inner chute; 408, second inner slider; 41, outer socket forming device; 411, outer annular bracket; 412, outer forming module; 4121, outer conical surface of the module; 413, outer forming drive seat; 4131, inner conical surface of the drive seat; 414, outer forming drive assembly; 415, outer drive guiding assembly; 42, inner socket forming device; 421, inner annular bracket; 422, inner forming module; 4221, inner conical surface of the module; 423, inner forming cone; 4231, outer conical surface of the cone; 424, inner forming drive assembly; 43, transfer device; 431, transfer guide rail; 432, transfer sliding seat; 433, transfer drive assembly; 44, rotating device; 45, socket forming frame; 51, first conveying roller group; 52, second conveying roller group; 53, repair rotating roller group. Detailed implementation manners

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to the attached Figure 1 to the attached Figure 9 In this embodiment, a socket and spigot flexible joint steel pipe socket and spigot forming production line is provided, which includes a conveying track 100, a transfer device 200 arranged on the conveying track 100, a socket forming device 300 arranged on one side of the conveying track 100, and a spigot forming device 400 arranged on the other side of the conveying track 100. The socket forming device 300 and the spigot forming device 400 are arranged at intervals along the extension direction of the conveying track 100.

[0029] Among them, in this embodiment, a socket forming station and a spigot forming station are sequentially arranged from front to back along the extension direction of the conveying track 100. The socket forming device 300 is correspondingly arranged on one side of the socket forming station. The axial direction of the socket annular bracket 31 in the socket forming device 300 is perpendicular to the extension direction of the conveying track 100. A first conveying roller group 51 is arranged at the socket forming station. When the transfer device 200 moves the steel pipe to the socket forming station, the first conveying roller group 51 moves the steel pipe along the axial direction of the socket annular bracket 31 until the socket end of the steel pipe is docked with the socket forming device 300. Similarly, the spigot forming device 400 is correspondingly arranged on one side of the spigot forming station. The axial direction of the outer annular bracket 411 in the spigot forming device 400 is perpendicular to the extension direction of the conveying track 100. A second conveying roller group 52 is arranged at the spigot forming station. When the transfer device 200 moves the steel pipe to the spigot forming station, the second conveying roller group 52 moves the steel pipe along the axial direction of the outer annular bracket 411 until the spigot end of the steel pipe is docked with the spigot forming device 400.

[0030] Preferably, a repair station can be arranged behind the spigot forming station. A repair rotating roller group 53 is arranged at the repair station to drive the steel pipe to rotate, so as to facilitate the repair or inspection of the steel pipe. Preferably, several temporary storage stations can be arranged in front of the socket forming station, between the socket forming station and the spigot forming station, and behind the spigot forming station. Steel pipe temporary storage brackets are arranged at the temporary storage stations to provide support for the steel pipes.

[0031] Specifically, the transfer device 200 includes a transfer support, a traveling mechanism disposed below the transfer support and cooperating with the conveying track 100, and a lifting module disposed above the transfer support. The traveling mechanism can be a pulley cooperating with the conveying track 100. Preferably, there are two transfer devices 200 on the conveying track 100. One transfer device 200 is used in cooperation with the socket forming device 300, and the other transfer device 200 is used in cooperation with the spigot forming device 400, thereby further improving the production efficiency.

[0032] Among them, the socket forming device 300 includes a socket annular support 31, a socket forming module 32, and a socket forming driving mechanism. The socket forming module 32 is coaxial with the socket annular support 31. The socket forming module 32 includes a plurality of socket forming modules arranged in a circumferential array along the socket annular support 31. The socket forming driving mechanism is connected to the socket forming module 32 to drive each of the socket forming modules to move synchronously inward or outward along the radial direction of the socket annular support 31. By driving each socket forming module to move synchronously outward along the radial direction of the socket annular support 31 through the socket forming driving mechanism, the rapid forming of the steel pipe socket can be easily completed.

[0033] Further, the socket forming driving mechanism includes a socket forming cone 33 and a socket forming driving component 34. The socket forming cone 33 is arranged inside the socket forming module 32 and is coaxially connected to the socket forming module 32. An outer socket cone surface 331 is provided on the outer side of the socket forming cone 33, and an inner socket cone surface 321 that cooperates with the outer socket cone surface 331 is provided inside the socket forming module 32. The socket forming driving component 34 connects the socket forming cone 33 and the socket ring bracket 31 to drive the socket forming cone 33 to move axially relative to the socket ring bracket 31 and drive each of the socket forming modules to move synchronously along the radial direction of the socket ring bracket 31. Since the socket forming module 32 is connected to the socket forming cone 33, when each socket forming module in the socket forming module 32 moves, each socket forming module is simultaneously subjected to the pushing force of the socket forming cone 33, and the synchronous movement of each socket forming module is easily achieved. When the socket forming driving component 34 drives the socket forming cone 33 to move axially closer to the socket ring bracket 31, the outer socket cone surface 331 and the inner socket cone surface 321 interact with each other, so that each of the socket forming modules moves radially outward along the socket ring bracket 31, and thus the socket forming module 32 has a tendency to expand as a whole to apply an inner pressure to the steel pipe to promote the forming of the steel pipe; when the socket forming driving component 34 drives the socket forming cone 33 to move axially away from the socket ring bracket 31, the outer socket cone surface 331 and the inner socket cone surface 321 interact with each other, so that each of the socket forming modules moves radially inward along the socket ring bracket 31, and thus the socket forming module 32 has a tendency to contract as a whole to facilitate the detachment of the formed steel pipe from the socket forming module 32.

[0034] Among them, the socket forming driving component 34 includes a socket driving hydraulic cylinder connected to the socket forming cone 33. The fixed end of the socket driving hydraulic cylinder is fixedly connected to the socket ring bracket 31, and the movable end of the socket driving hydraulic cylinder is connected to the socket forming cone 33.

[0035] Furthermore, a socket cone surface matching structure is provided between the socket forming cone 33 and the socket forming module 32. The socket cone surface matching structure includes a second socket chute 303 extending along the extension direction of the outer socket cone surface 331 and a second socket slider 304 matching with the second socket chute 303. The second socket chute 303 is provided on either the socket forming cone 33 or the socket forming module 32, and the second socket slider 304 is provided on the other of the socket forming cone 33 and the socket forming module 32. On the one hand, the socket forming cone 33 and the socket forming module 32 are connected through the cooperation of the second socket chute 303 and the second socket slider 304, avoiding the separation of the socket forming module 32 from the socket forming cone 33. On the other hand, the cooperation of the second socket chute 303 and the second socket slider 304 provides a guiding and limiting effect for the relative movement of the socket forming cone 33 and the socket forming module 32, making the relative movement of the socket forming cone 33 and the socket forming module 32 smoother, more stable and more accurate.

[0036] Furthermore, a socket radial matching structure is provided between the socket annular bracket 31 and the socket forming module 32. The socket radial matching structure includes a first socket chute 301 extending along the radial direction of the socket annular bracket 31 and a first socket slider 302 matching with the first socket chute 301. The first socket chute 301 is provided on either the socket annular bracket 31 or the socket forming module 32, and the first socket slider 302 is provided on the other of the socket annular bracket 31 and the socket forming module 32. On the one hand, the socket annular bracket 31 and the socket forming module 32 are connected through the cooperation of the first socket chute 301 and the first socket slider 302, avoiding the separation of the socket forming module 32 from the socket annular bracket 31. On the other hand, the cooperation of the first socket chute 301 and the first socket slider 302 provides a guiding and limiting effect for the relative movement of the socket forming module 32 and the socket annular bracket 31, making the relative movement of the socket forming module 32 and the socket annular bracket 31 smoother, more stable and more accurate.

[0037] Further, an annular limiting plate 311 is provided on the socket annular bracket 31. A limiting conical surface 312 is provided inside the annular limiting plate 311. The diameter of the limiting conical surface 312 gradually increases along the axial direction from the end far away from the socket forming module 32 to the end close to the socket forming module 32. When the socket forming driving assembly 34 drives the socket forming cone 33 to move axially and drives each of the socket forming modules to move radially outward along the socket annular bracket 31, so that the socket forming module 32 has an overall expanding tendency, at this time, an end-inward structure is formed between the steel pipe socket end and the limiting conical surface 312. Moreover, since the diameter of the limiting conical surface 312 gradually increases along the axial direction from the end far away from the socket forming module 32 to the end close to the socket forming module 32, it is convenient for the steel pipe to axially disengage from the annular limiting plate 311 along the socket annular bracket 31.

[0038] Among them, the socket forming device 400 includes a socket outer forming device 41 and a socket inner forming device 42. The socket outer forming device 41 includes an outer annular bracket 411, an outer forming module 412, and an outer forming driving mechanism. The outer forming module 412 is coaxial with the outer annular bracket 411. The outer forming module 412 includes a plurality of outer forming modules arranged in a circumferential array along the outer annular bracket 411. The outer forming driving mechanism is connected to the outer forming module 412 to drive each of the outer forming modules to move radially inward or outward synchronously along the outer annular bracket 411. The socket inner forming device 42 includes an inner annular bracket 421, an inner forming module 422, and an inner forming driving mechanism. The inner forming module 422 is arranged inside the outer forming module 412 to form a socket forming cavity between the inner forming module 422 and the outer forming module 412. The inner forming module 422 is coaxial with the outer forming module 412 and the inner annular bracket 421. The inner forming module 422 includes a plurality of inner forming modules arranged in a circumferential array along the inner annular bracket 421. The inner forming driving mechanism is connected to the inner forming module 422 to drive each of the inner forming modules to move radially inward or outward synchronously along the inner annular bracket 421. By driving each of the outer forming modules to move radially inward synchronously along the outer annular bracket 411 through the outer forming driving mechanism, and driving each of the inner forming modules to move radially outward synchronously along the inner annular bracket 421 through the inner forming driving mechanism, the rapid forming of the steel pipe socket can be completed; the degree of mechanization and automation is high, the operation is simple, the forming efficiency is high, and the inner forming module 422 and the outer forming module 412 can be customized with corresponding profiles according to actual needs, which can meet the rapid forming of complex socket interfaces with different structures.

[0039] Among them, the socket forming device 400 further includes a rotating device 44, and the rotating device 44 is connected to the inner socket forming device 42 to drive the inner socket forming device 42 to rotate relative to the outer socket forming device 41. The socket forming device 400 of this embodiment further includes a socket forming frame 45. The inner socket forming device 42 is arranged on the socket forming frame 45. The rotating device 44 includes a rotating drive hydraulic cylinder. The fixed end of the rotating drive hydraulic cylinder is connected to the socket forming frame 45, and the telescopic end of the rotating drive hydraulic cylinder is connected to the inner socket forming device 42. The driving direction of the rotating device 44 is perpendicular to the axial direction of the inner ring bracket 421 to drive the inner socket forming device 42 to rotate relative to the outer socket forming device 41. During the process of the inner socket forming device 42 and the outer socket forming device 41 cooperating to complete the forming of the steel pipe socket, the inner forming module 422 of the inner socket forming device 42 expands as a whole, and some gaps will inevitably appear between each inner forming module. After the inner socket forming device 42 and the outer socket forming device 41 cooperate to complete a socket forming operation on the steel pipe, the rotating device 44 can be used to drive the inner socket forming device 42 to rotate relative to the outer socket forming device 41, so that the inner forming module 422 of the inner socket forming device 2 rotates accordingly. That is, after changing the relative positions of the inner forming module 422 and the outer forming module 412, the inner socket forming device 42 and the outer socket forming device 41 cooperate again to complete a socket forming operation on the steel pipe, which can effectively eliminate the protrusions or grooves that may be generated due to the gaps between the inner forming modules during the first forming and achieve a better forming effect. Preferably, the rotating device 44 can drive the inner socket forming device 42 to rotate 0° to 30° relative to the outer socket forming device 41.

[0040] Preferably, in this embodiment, the outer forming driving mechanism includes an outer forming driving seat 413 and an outer forming driving assembly 414. The outer forming driving seat 413 is arranged outside the outer forming module 412 and is coaxially connected to the outer forming module 412. An inner conical surface 4131 of the driving seat is provided inside the outer forming driving seat 413, and an outer conical surface 4121 that cooperates with the inner conical surface 4131 of the driving seat is provided outside the outer forming module 412. The outer forming driving assembly 414 connects the outer forming driving seat 413 and the outer annular bracket 411 to drive the outer forming driving seat 413 to move axially relative to the outer annular bracket 411 and drive each of the outer forming modules to move synchronously along the radial direction of the outer annular bracket 411. Among them, the outer forming driving seat 413 is annular. Since the outer forming module 412 is connected to the outer forming driving seat 413, when each outer forming module in the outer forming module 412 moves, it is simultaneously subjected to the pushing force of the outer forming driving seat 413, and the synchronous movement of each outer forming module is easily achieved. When the outer forming driving assembly 414 drives the outer forming driving seat 413 to move axially closer to the outer annular bracket 411, the inner conical surface 4131 of the driving seat and the outer conical surface 4121 of the module interact, so that each of the outer forming modules moves radially inward along the outer annular bracket 411, and thus the outer forming module 412 has an overall shrinking trend to apply an outer pressure to the steel pipe in the interface forming cavity to promote the forming of the steel pipe; when the outer forming driving assembly 414 drives the outer forming driving seat 413 to move axially away from the outer annular bracket 411, the inner conical surface 4131 of the driving seat and the outer conical surface 4121 of the module interact, so that each of the outer forming modules moves radially outward along the outer annular bracket 411, and thus the outer forming module 412 has an overall expanding trend to facilitate the separation of the formed steel pipe from the outer forming module 412.

[0041] Among them, the outer forming driving assembly 414 includes an outer driving hydraulic cylinder, and a plurality of the outer forming driving assemblies 414 are arranged in a circumferential array along the outer forming driving seat 413. The driving effect is good, which is beneficial to driving each outer forming module in the outer forming module 412 to move synchronously.

[0042] Furthermore, the outer forming driving mechanism includes an outer driving and guiding assembly 415. The outer driving and guiding assembly 415 includes a sleeve and a guide post sleeved in the sleeve. The sleeve is fixedly connected to either the outer forming driving seat 413 or the outer annular bracket 411, and the guide post is fixedly connected to the other of the outer forming driving seat 413 and the outer annular bracket 411. When the outer forming driving assembly 414 drives the outer forming driving seat 413 to move axially relative to the outer annular bracket 411, the guide post moves relative to the sleeve, thereby providing a guiding effect for the axial movement of the outer forming driving seat 413 relative to the outer annular bracket 411, making the axial movement of the outer forming driving seat 413 relative to the outer annular bracket 411 smoother and more stable, which is beneficial to driving the synchronous movement of each outer forming module in the outer forming module 412.

[0043] Preferably, a plurality of the outer driving and guiding assemblies 415 are arranged in a circumferential array along the outer forming driving seat 413. The guiding effect is good, which is beneficial to promoting the smoother and more stable axial movement of the outer forming driving seat 413 relative to the outer annular bracket 411.

[0044] Furthermore, an outer conical surface matching structure is provided between the outer forming driving seat 413 and the outer forming module 412. The outer conical surface matching structure includes an outer second chute 403 extending along the extension direction of the outer conical surface 4121 of the module and an outer second slider 404 cooperating with the outer second chute 403. The outer second chute 403 is provided on either the outer forming driving seat 413 or the outer forming module 412, and the outer second slider 404 is provided on the other of the outer forming driving seat 413 and the outer forming module 412. On the one hand, the outer forming driving seat 413 and the outer forming module 412 are connected through the cooperation of the outer second chute 403 and the outer second slider 404, avoiding the separation of the outer forming module 412 from the outer forming driving seat 413. On the other hand, the cooperation of the outer second chute 403 and the outer second slider 404 provides a guiding effect and a limiting effect for the relative movement of the outer forming driving seat 413 and the outer forming module 412, making the relative movement of the outer forming driving seat 413 and the outer forming module 412 smoother, more stable and more accurate.

[0045] Further, an outer radial mating structure is provided between the outer annular bracket 411 and the outer forming module 412. The outer radial mating structure includes an outer first chute 401 extending radially along the outer annular bracket 411 and an outer first slider 402 mating with the outer first chute 401. The outer first chute 401 is provided on either the outer annular bracket 411 or the outer forming module 412, and the outer first slider 402 is provided on the other of the outer annular bracket 411 and the outer forming module 412. On the one hand, the outer annular bracket 411 and the outer forming module 412 are connected by the cooperation of the outer first chute 401 and the outer first slider 402, preventing the outer forming module 412 from detaching from the outer annular bracket 411. On the other hand, the cooperation of the outer first chute 401 and the outer first slider 402 provides guidance and limitation for the relative movement between the outer forming module 412 and the outer annular bracket 411, making the relative movement between the outer forming module 412 and the outer annular bracket 411 smoother, more stable and more accurate.

[0046] Preferably, the outer first chute 401 and the outer second chute 403 are in an inverted "T" shape, and the width of the slot opening is smaller than the width of the slot bottom.

[0047] Preferably, in this embodiment, the inner forming driving mechanism includes an inner forming cone 423 and an inner forming driving assembly 424. The inner forming cone 423 is disposed inside the inner forming module 422 and is coaxially connected to the inner forming module 422. An outer conical surface 4231 is provided on the outer side of the inner forming cone 423, and an inner conical surface 4221 that cooperates with the outer conical surface 4231 is provided inside the inner forming module 422. The inner forming driving assembly 424 connects the inner forming cone 423 and the inner annular bracket 421 to drive the inner forming cone 423 to move axially relative to the inner annular bracket 421 and drive each of the inner forming modules to move synchronously along the radial direction of the inner annular bracket 421. Since the inner forming module 422 is connected to the inner forming cone 423, when each of the inner forming modules in the inner forming module 422 moves, each of the inner forming modules is simultaneously subjected to the pushing force of the inner forming cone 423, and the synchronous movement of each of the inner forming modules is easily achieved. When the inner forming driving assembly 424 drives the inner forming cone 423 to move axially closer to the inner annular bracket 421, the outer conical surface 4231 and the inner conical surface 4221 interact with each other, so that each of the inner forming modules moves radially outward along the inner annular bracket 421, and thus the inner forming module 422 has a tendency to expand as a whole, so as to apply an inner pressure to the steel pipe in the interface forming cavity to promote the forming of the steel pipe; when the inner forming driving assembly 424 drives the inner forming cone 423 to move axially away from the inner annular bracket 421, the outer conical surface 4231 and the inner conical surface 4221 interact with each other, so that each of the inner forming modules moves radially inward along the inner annular bracket 421, and thus the inner forming module 422 has a tendency to contract as a whole, so as to facilitate the separation of the formed steel pipe from the inner forming module 422.

[0048] Among them, the inner forming driving assembly 424 includes an inner driving hydraulic cylinder connected to the inner forming cone 423. The fixed end of the inner driving hydraulic cylinder is fixedly connected to the inner annular bracket 421, and the movable end of the inner driving hydraulic cylinder is connected to the inner forming cone 423.

[0049] Further, an inner conical surface matching structure is provided between the inner forming cone 423 and the inner forming module 422. The inner conical surface matching structure includes an inner second chute 407 extending along the extension direction of the outer conical surface 4231 of the cone and an inner second slider 408 matching with the inner second chute 407. The inner second chute 407 is provided on either the inner forming cone 423 or the inner forming module 422, and the inner second slider 408 is provided on the other of the inner forming cone 423 and the inner forming module 422. On the one hand, the inner forming cone 423 and the inner forming module 422 are connected through the cooperation of the inner second chute 407 and the inner second slider 408, avoiding the inner forming module 422 from detaching from the inner forming cone 423. On the other hand, the cooperation of the inner second chute 407 and the inner second slider 408 provides a guiding and limiting effect for the relative movement of the inner forming cone 423 and the inner forming module 422, making the relative movement of the inner forming cone 423 and the inner forming module 422 smoother, more stable and more accurate.

[0050] Further, an inner radial matching structure is provided between the inner annular bracket 421 and the inner forming module 422. The inner radial matching structure includes an inner first chute 405 extending along the radial direction of the inner annular bracket 421 and an inner first slider 406 matching with the inner first chute 405. The inner first chute 405 is provided on either the inner annular bracket 421 or the inner forming module 422, and the inner first slider 406 is provided on the other of the inner annular bracket 421 and the inner forming module 422. On the one hand, the inner annular bracket 421 and the inner forming module 422 are connected through the cooperation of the inner first chute 405 and the inner first slider 406, avoiding the inner forming module 422 from detaching from the inner annular bracket 421. On the other hand, the cooperation of the inner first chute 405 and the inner first slider 406 provides a guiding and limiting effect for the relative movement of the inner forming module 422 and the inner annular bracket 421, making the relative movement of the inner forming module 422 and the inner annular bracket 421 smoother, more stable and more accurate.

[0051] Preferably, the inner first chute 405 and the inner second chute 407 are in an inverted "T" shape, and the width of the notch is smaller than the width of the bottom of the groove.

[0052] Furthermore, the socket forming device 400 further includes a transfer device 43. The transfer device 43 includes a transfer guide rail 431, a transfer slide 432, and a transfer drive assembly 433. The length direction of the transfer guide rail 431 is parallel to the axial direction of the outer annular bracket 411. The transfer slide 432 is movably disposed on the transfer guide rail 431 and is connected to the socket outer forming device 41. The transfer drive assembly 433 is connected to the transfer slide 432 to drive the transfer slide 432 to drive the socket outer forming device 41 to move along the transfer guide rail 431. By driving the socket outer forming device 41 to move integrally along the axial direction of the outer annular bracket 411 through the transfer device 43, it is convenient to perform individual repairs or maintenance on the socket outer forming device 41 or the socket inner forming device 42, and it is also convenient to replace the outer forming module or the inner forming module with the shape required for production on the outer forming module 412 or the inner forming module 422.

[0053] Specifically, the transfer drive assembly 433 includes a transfer drive motor, a transfer lead screw, and a transfer nut. The transfer lead screw is connected to the output end of the transfer drive motor. The transfer nut is connected to the transfer slide and is in threaded cooperation with the transfer lead screw. The length direction of the transfer lead screw is parallel to the length direction of the transfer guide rail. The transfer drive motor drives the transfer lead screw to rotate, thereby driving the transfer slide connected to the transfer nut to move along the transfer lead screw, and further driving the socket outer forming device 41 to move integrally along the axial direction of the outer annular bracket 411. The structure is simple and easy to implement.

[0054] This embodiment also provides a method for forming the socket and spigot of a socket-and-spigot flexible joint steel pipe, which is applied to the socket-and-spigot flexible joint steel pipe forming production line as described above, and includes the following steps: S1. The transfer device 200 drives the steel pipe to move along the conveying track 100 to the spigot forming device 300. S2. Spigot forming: The spigot forming drive mechanism drives each of the spigot forming modules to move synchronously outward along the radial direction of the spigot annular bracket 31 to a specified position, so that the steel pipe completes spigot forming. S3. Spigot demolding: The spigot forming drive mechanism drives each of the spigot forming modules to move synchronously inward along the radial direction of the spigot annular bracket 31 to the initial position, so that the spigot forming module 32 is separated from the steel pipe. S4. The transfer device 200 drives the steel pipe to move along the conveying track 100 to the socket forming device 400. S5. One-time forming of socket: The outer forming drive mechanism in the socket outer forming device 41 drives each outer forming module to synchronously move inward along the radial direction of the outer annular support 411 to a specified position; the inner forming drive mechanism in the socket inner forming device 42 drives each inner forming module to synchronously move outward along the radial direction of the inner annular support 421 to a specified position; so that the socket of the steel pipe is formed once in the socket forming cavity between the outer forming module 412 and the inner forming module 422. S6. Secondary forming of socket: The inner forming drive mechanism in the socket inner forming device 42 drives each inner forming module to synchronously move inward along the radial direction of the inner annular support 421 to the initial position, so that the inner forming module 422 is separated from the steel pipe; the rotating device 44 drives the socket inner forming device 42 to rotate a specified angle relative to the socket outer forming device 41; the inner forming drive mechanism in the socket inner forming device 42 drives each inner forming module to synchronously move outward along the radial direction of the inner annular support 421 to a specified position; so that the socket of the steel pipe is formed twice in the socket forming cavity between the outer forming module 412 and the inner forming module 422. S7. Demolding of socket: The inner forming drive mechanism in the socket inner forming device 42 drives each inner forming module to synchronously move inward along the radial direction of the inner annular support 421 to the initial position, so that the inner forming module 422 is separated from the steel pipe; the outer forming drive mechanism in the socket outer forming device 41 drives each outer forming module to synchronously move outward along the radial direction of the outer annular support 411 to the initial position, so that the outer forming module 412 is separated from the steel pipe.

[0055] In the socket and spigot forming production line and forming method of the socket and spigot flexible joint steel pipe provided in this embodiment, in the socket forming device 300, by driving each socket forming module to synchronously move outward along the radial direction of the socket annular support 31 through the socket forming drive mechanism, the rapid forming of the socket of the steel pipe can be easily completed; in the socket forming device 400, by driving each outer forming module to synchronously move inward along the radial direction of the outer annular support 411 through the outer forming drive mechanism, and driving each inner forming module to synchronously move outward along the radial direction of the inner annular support 421 through the inner forming drive mechanism, the rapid forming of the socket of the steel pipe can be completed; the degree of mechanization and automation is high, the operation is simple, the forming efficiency is high, and the inner forming module 422 and the outer forming module 412 can be customized with corresponding profiles according to actual needs, which can meet the rapid forming of complex socket and spigot joints with different structures. In addition, after the one-time forming of the socket is completed, the rotating device 44 can drive the socket inner forming device 42 to rotate relative to the socket outer forming device 41, change the relative positions of the inner forming module 422 and the outer forming module 412, and then complete the secondary forming of the socket, so as to effectively eliminate the grooves and protrusions generated in the one-time forming and obtain a better forming effect.

[0056] It should be understood that in the present invention, terms such as "first" and "second" are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information. In addition, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0057] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. Socket and spigot flexible joint steel pipe socket and spigot forming production line, characterized in that, It includes a conveying track (100), a transfer device (200) provided on the conveying track (100), a socket forming device (300) provided on one side of the conveying track (100), and a spigot forming device (400) provided on the other side of the conveying track (100). The socket forming device (300) and the spigot forming device (400) are arranged at intervals along the extending direction of the conveying track (100). The socket forming device (300) includes a socket annular support (31), a socket forming module (32), and a socket forming driving mechanism. The socket forming module (32) is coaxial with the socket annular support (31). The socket forming module (32) includes a plurality of socket forming modules arranged in a circumferential array along the socket annular support (31). The socket forming driving mechanism is connected to the socket forming module (32) to drive each of the socket forming modules to move synchronously inward or outward along the radial direction of the socket annular support (31). The spigot forming device (400) includes a spigot outer forming device (41), a spigot inner forming device (42), and a rotating device (44). The rotating device (44) is connected to the spigot inner forming device (42) to drive the spigot inner forming device (42) to rotate relative to the spigot outer forming device (41). The spigot outer forming device (41) includes an outer annular support (411), an outer forming module (412), and an outer forming driving mechanism. The outer forming module (412) is coaxial with the outer annular support (411). The outer forming module (412) includes a plurality of outer forming modules arranged in a circumferential array along the outer annular support (411). The outer forming driving mechanism is connected to the outer forming module (412) to drive each of the outer forming modules to move synchronously inward or outward along the radial direction of the outer annular support (411). The spigot inner forming device (42) includes an inner annular support (421), an inner forming module (422), and an inner forming driving mechanism. The inner forming module (422) is arranged inside the outer forming module (412) to form a spigot forming cavity between the inner forming module (422) and the outer forming module (412). The inner forming module (422) is coaxial with the outer forming module (412) and the inner annular support (421). The inner forming module (422) includes a plurality of inner forming modules arranged in a circumferential array along the inner annular support (421). The inner forming driving mechanism is connected to the inner forming module (422) to drive each of the inner forming modules to move synchronously inward or outward along the radial direction of the inner annular support (421).

2. The socket and spigot flexible joint steel pipe socket and spigot forming production line according to claim 1, characterized in that, The outer forming drive mechanism includes an outer forming drive base (413) and an outer forming drive assembly (414). The outer forming drive base (413) is disposed outside the outer forming module (412) and is coaxially connected to the outer forming module (412). An inner conical surface (4131) of the drive base is provided inside the outer forming drive base (413), and an outer conical surface (4121) of the module that mates with the inner conical surface (4131) is provided outside the outer forming module (412). The outer forming drive assembly (414) connects the outer forming drive base (413) and the outer annular bracket (411) to drive the outer forming drive base (413) to move axially relative to the outer annular bracket (411) and drive each of the outer forming modules to move synchronously in the radial direction of the outer annular bracket (411).

3. The socket and spigot flexible joint steel pipe socket and spigot forming production line according to claim 2, characterized in that, An outer conical surface mating structure is provided between the outer forming drive base (413) and the outer forming module (412). The outer conical surface mating structure includes an outer second chute (403) extending along the extension direction of the outer conical surface (4121) of the module and an outer second slider (404) mating with the outer second chute (403). The outer second chute (403) is provided on either the outer forming drive base (413) or the outer forming module (412), and the outer second slider (404) is provided on the other of the outer forming drive base (413) and the outer forming module (412). An outer radial mating structure is provided between the outer annular bracket (411) and the outer forming module (412). The outer radial mating structure includes an outer first chute (401) extending in the radial direction of the outer annular bracket (411) and an outer first slider (402) mating with the outer first chute (401). The outer first chute (401) is provided on either the outer annular bracket (411) or the outer forming module (412), and the outer first slider (402) is provided on the other of the outer annular bracket (411) and the outer forming module (412).

4. The socket and spigot flexible joint steel pipe socket and spigot forming production line according to claim 1, characterized in that, The inner forming drive mechanism includes an inner forming cone (423) and an inner forming drive assembly (424). The inner forming cone (423) is disposed inside the inner forming module (422) and is coaxially connected to the inner forming module (422). An outer conical surface (4231) of the cone is provided outside the inner forming cone (423), and an inner conical surface (4221) of the module that mates with the outer conical surface (4231) is provided inside the inner forming module (422). The inner forming drive assembly (424) connects the inner forming cone (423) and the inner annular bracket (421) to drive the inner forming cone (423) to move axially relative to the inner annular bracket (421) and drive each of the inner forming modules to move synchronously in the radial direction of the inner annular bracket (421).

5. The socket and spigot flexible joint steel pipe socket and spigot forming production line according to claim 4, characterized in that, An inner conical surface matching structure is provided between the inner forming cone (423) and the inner forming module (422). The inner conical surface matching structure includes an inner second chute (407) extending along the extending direction of the outer conical surface (4231) of the cone and an inner second slider (408) matching with the inner second chute (407). The inner second chute (407) is provided on either the inner forming cone (423) or the inner forming module (422), and the inner second slider (408) is provided on the other of the inner forming cone (423) and the inner forming module (422). An inner radial matching structure is provided between the inner annular bracket (421) and the inner forming module (422). The inner radial matching structure includes an inner first chute (405) extending along the radial direction of the inner annular bracket (421) and an inner first slider (406) matching with the inner first chute (405). The inner first chute (405) is provided on either the inner annular bracket (421) or the inner forming module (422), and the inner first slider (406) is provided on the other of the inner annular bracket (421) and the inner forming module (422).

6. The socket and spigot flexible joint steel pipe socket and spigot forming production line according to claim 1, characterized in that, The socket forming device (400) further includes a transfer device (43). The transfer device (43) includes a transfer guide rail (431), a transfer slide seat (432), and a transfer driving component (433). The length direction of the transfer guide rail (431) is parallel to the axial direction of the outer annular bracket (411). The transfer slide seat (432) is movably provided on the transfer guide rail (431) and connected to the socket outer forming device (41). The transfer driving component (433) is connected to the transfer slide seat (432) to drive the transfer slide seat (432) to drive the socket outer forming device (41) to move along the transfer guide rail (431).

7. The socket and spigot flexible joint steel pipe socket and spigot forming production line according to claim 1, characterized in that, The spigot forming driving mechanism includes a spigot forming cone (33) and a spigot forming driving component (34). The spigot forming cone (33) is provided inside the spigot forming module (32) and is coaxially connected to the spigot forming module (32). An outer spigot conical surface (331) is provided on the outside of the spigot forming cone (33), and an inner spigot conical surface (321) matching with the outer spigot conical surface (331) is provided inside the spigot forming module (32). The spigot forming driving component (34) connects the spigot forming cone (33) and the spigot annular bracket (31) to drive the spigot forming cone (33) to move axially relative to the spigot annular bracket (31) and drive each spigot forming module to move synchronously along the radial direction of the spigot annular bracket (31).

8. The socket and spigot flexible joint steel pipe socket and spigot forming production line according to claim 7, characterized in that, A socket cone surface matching structure is provided between the socket forming cone (33) and the socket forming module (32). The socket cone surface matching structure includes a second socket chute (303) extending along the extension direction of the outer socket cone surface (331) and a second socket slider (304) matching with the second socket chute (303). The second socket chute (303) is provided on either the socket forming cone (33) or the socket forming module (32), and the second socket slider (304) is provided on the other of the socket forming cone (33) and the socket forming module (32). An inner diameter radial matching structure is provided between the socket annular bracket (31) and the socket forming module (32). The inner diameter radial matching structure includes a first socket chute (301) extending along the radial direction of the socket annular bracket (31) and a first socket slider (302) matching with the first socket chute (301). The first socket chute (301) is provided on either the socket annular bracket (31) or the socket forming module (32), and the first socket slider (302) is provided on the other of the socket annular bracket (31) and the socket forming module (32).

9. The socket and spigot flexible joint steel pipe socket and spigot forming production line according to claim 7, characterized in that, A ring-shaped limiting plate (311) is provided on the socket annular bracket (31), and a limiting cone surface (312) is provided inside the ring-shaped limiting plate (311). The diameter of the limiting cone surface (312) gradually increases along the axial direction from the end far away from the socket forming module (32) to the end close to the socket forming module (32).

10. Socket and spigot flexible joint steel pipe socket and spigot forming method, characterized in that, Applied to the socket and spigot forming production line of the socket and spigot flexible joint steel pipe according to any one of claims 1-9, the method includes the following steps: S1. The transfer device (200) drives the steel pipe to move along the conveying track (100) to the socket forming device (300). S2. Socket forming: The socket forming driving mechanism drives each of the socket forming modules to synchronously move radially outward along the socket annular bracket (31) to a specified position, so that the socket of the steel pipe is formed. S3. Socket demolding: The socket forming driving mechanism drives each of the socket forming modules to synchronously move radially inward along the socket annular bracket (31) to the initial position, so that the socket forming module (32) is separated from the steel pipe. S4. The transfer device (200) drives the steel pipe to move along the conveying track (100) to the spigot forming device (400). S5. First spigot forming: The outer forming driving mechanism in the outer spigot forming device (41) drives each outer forming module to synchronously move radially inward along the outer annular bracket (411) to a specified position; the inner forming driving mechanism in the inner spigot forming device (42) drives each inner forming module to synchronously move radially outward along the inner annular bracket (421) to a specified position; so that the first spigot of the steel pipe is formed in the spigot forming cavity between the outer spigot forming module (412) and the inner spigot forming module (422). S6. Second forming of socket: The inner forming driving mechanism in the socket inner forming device (42) drives each inner forming module to move synchronously towards the inside along the radial direction of the inner annular bracket (421) to the initial position, so that the inner forming module group (422) disengages from the steel pipe; the rotating device (44) drives the socket inner forming device (42) to rotate a specified angle relative to the socket outer forming device (41); the inner forming driving mechanism in the socket inner forming device (42) drives each inner forming module to move synchronously towards the outside along the radial direction of the inner annular bracket (421) to the specified position; so that the socket second forming is completed in the socket forming cavity between the outer forming module (412) and the inner forming module (422) of the steel pipe. S7. Socket demoulding: The inner forming driving mechanism in the socket inner forming device (42) drives each inner forming module to move synchronously towards the inside along the radial direction of the inner annular bracket (421) to the initial position, so that the inner forming module (422) disengages from the steel pipe; the outer forming driving mechanism in the socket outer forming device (41) drives each outer forming module to move synchronously towards the outside along the radial direction of the outer annular bracket (411) to the initial position, so that the outer forming module (412) disengages from the steel pipe.

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