A drawing apparatus for seamless steel pipes

Abstract

The application discloses a seamless steel pipe drawing forming equipment, and relates to the technical field of steel pipe drawing, which comprises a mandrel and a functional mechanism for supporting the inner wall of a forming piece, wherein the functional mechanism comprises at least two functional pieces, and the two functional pieces are distributed on two opposite radial directions of the mandrel; and the drawing forming equipment further comprises an elongated piece provided with the functional mechanism. The drawing forming equipment for the seamless steel pipe has the advantages that when the forming piece has a certain length, the functional pieces in the functional mechanism are extended to contact the forming piece for supporting the inside of the forming piece in the process of drawing forming of the seamless steel pipe; compared with the single long mandrel, the elongated piece with the functional mechanism is connected by multiple sections, the coaxiality of the multiple sections after connection is higher, and the functional mechanism attached to the elongated piece can form multi-point support in the inside of the long forming piece, so that the forming precision of the inner wall of the long seamless steel pipe is ensured.

Description

Technical Field

[0001] This invention relates to the field of steel pipe stretching technology, specifically to a stretching and forming equipment for seamless steel pipes. Background Technology

[0002] In some stretch forming processes of seamless steel pipes, mandrels are required. The diameter of the mandrel determines the inner diameter of the steel pipe and works with the outer mold to control the wall thickness tolerance of the seamless steel pipe. The mandrel mainly serves a supporting function.

[0003] When the required length of the seamless steel pipe is long, if the length of the mandrel is short, the portion of the steel pipe that has been formed by the mandrel will sag and deviate from the axis due to its own weight, resulting in bending deformation. When the length of the mandrel used is long, the same principle applies as above, and it will also be subject to flexural deformation, which will not only lead to failure of the support and guidance, but will also interfere with the forming of the seamless steel pipe during the support process. Longer mandrels are more likely to be bumped or knocked during installation than shorter mandrels, which can lead to slight bending and make assembly more difficult. After some seamless steel pipes are stretched and formed, such as seamless steel pipes with high requirements for the smoothness of the inner wall, an additional inner wall grinding process is required. The integration of the process can be improved to some extent.

[0004] In view of the above-mentioned technical problems, we propose a stretching and forming equipment for seamless steel pipes. Summary of the Invention

[0005] [Technical problems solved] To address the shortcomings of existing technologies, this invention provides a stretching and forming equipment for seamless steel pipes, which has advantages such as segmented lengthening, extended support, extended grinding, and optional modular design, and can effectively solve the problems in the background technology.

[0006] [Technical Solution] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a stretching and forming device for seamless steel pipes, comprising a mandrel, wherein a functional mechanism is provided on one end of the mandrel that is not aligned with the blank, the functional mechanism being used to support the inner wall of the formed part, the functional mechanism comprising at least two functional components, the two functional components being distributed on two opposite radial directions on the mandrel, the functional mechanism further comprising at least a transformation mechanism for moving the functional components in the radial direction of the mandrel, the functional components being a support block or a grinding block, the stretching and forming device further comprising an extension member provided with the functional mechanism, wherein one end of the extension member that is not provided with the functional mechanism can be connected to a functional mechanism other than the functional mechanism.

[0007] Preferably, two opposing radials refer to two radials on the mandrel that are on the same straight line but in opposite directions.

[0008] Preferably, the stretching forming equipment also includes a cold rolling device or a hot rolling device. The main stretching forming equipment for seamless steel pipes is not further limited. This is an optional setup made by those skilled in the art for actual implementation. That is, the mandrel and functional mechanism can be applied to any seamless steel pipe production implementation scenario that requires stretching forming with a mandrel.

[0009] Preferably, the transformation mechanism can be any transformation mechanism capable of driving the functional component to move at least in the radial direction of the mandrel. For example, it can be any mechanism known and understood by those skilled in the art capable of driving the functional component to perform equidistant relative / separate movement transformations.

[0010] As a preferred option, such as Figure 3 The structure shown can have a contact part on the side of the support block that meets the molded part. The contact part is a spherical object. This spherical object makes contact with the molded part, which can minimize the contact friction between the support block and the molded part in the process of effectively supporting the molded part.

[0011] Preferably, the transformation mechanism includes a movement transformation group for moving the support block in the radial direction of the mandrel. The movement transformation group includes a rotating member, and the rotating member has a number of guide portions corresponding to the support block. The guide portions are configured such that, under the premise that the support block is restricted from circumferential movement, rotating the rotating member is used to drive the support block to move in the radial direction of the mandrel.

[0012] Preferably, the rotating component is a disk, and the rotating component can be rotatably connected to its external side.

[0013] Preferably, the guide portion is as follows: Figure 5 The guide groove shown is formed by a shaft fixedly connected to the functional component, which slides and guides the interior of the guide section.

[0014] Preferably, at least two functional components are provided in a single radial direction of the mandrel, and the working surfaces of the at least two functional components are not in the same orientation. The at least two functional components are configured such that when at least one functional component is a support block, the other support block is a grinding block. The transformation mechanism further includes a rotation transformation group for changing the orientation of the two functional components in a single radial direction.

[0015] Preferably, the rotation conversion group includes a first gear and a second gear meshing with the first gear, the number of the second gears corresponding to the radial number on the mandrel on which the functional components are provided.

[0016] Preferably, the number of gears two corresponds to the number of radial components on the mandrel on which the functional components are provided. For example, there are two radial components on the mandrel that are provided with functional components, that is, there are two gears two. The number of functional components on a single radial component is independent of the number of gears two.

[0017] Preferably, the transformation mechanism further includes a limiting member, which is configured to restrict the functional member from moving in the circumferential direction of the mandrel during the orientation / radial adjustment of the functional member.

[0018] Preferably, the limiting member is rotatably connected to the outside of the mandrel.

[0019] Preferably, the conversion mechanism further includes a driving member, which includes at least one engaging member fixed to the outside and another engaging member rotatably connected to the engaging member. The engaging member fixed to the outside can engage with at least one rotating member or gear, and the other engaging member can engage with at least one non-rotatable external part or limiting member.

[0020] Preferably, the connecting member is a key shaft, preferably a spline shaft. When the connecting member is a key shaft, a second connecting part and a third connecting part are provided on the rotating member and the second connecting part to form a connection with the connecting member.

[0021] Preferably, the connecting member that is fixed to the outside means that the connecting member can be a shaft that is fixedly connected to the outside, and the rotation of the entire drive component is controlled by the shaft.

[0022] Preferably, the non-rotatable external part refers to the part that restricts the rotation of the joint when the joint is engaged with it, and this part is a joint portion provided on the mandrel.

[0023] Preferably, the rotation conversion assembly further includes a wheel carrier for restricting the second gear from moving circumferentially based on the first gear, and the wheel carrier can engage with the externally fixed coupling member.

[0024] Preferably, the wheel frame is rotatably connected to the rotating component.

[0025] Preferably, the functional mechanism further includes a force-applying component, which is configured to restrict the rotating component from rotating during the process of adjusting the orientation of the functional component.

[0026] Preferably, the first force-applying component is an elastic component, and a force-receiving part that cooperates with the first force-applying component is provided on the rotating component. When the force-receiving part engages with the first force-applying component, the rotating component is restricted to be non-rotatable. Furthermore, a second force-applying component is provided on the driving component at a location that does not affect its engagement. When the second force-applying component applies force to the first force-applying component, the first force-applying component disengages from the force-receiving part and engages with it.

[0027] Preferably, the force-applying component is a fixed connection to the fixing part, which can be a mandrel.

[0028] Preferably, the rotating part can be a part that is rotatably connected to the driving part without affecting its engagement. For example, it can be a smooth rod section between the engaging parts. When the second force-applying part is rotatably connected to the driving part, the rotation of the engaging part will not interfere with the force applied by the second force-applying part. That is, the second force-applying part will only apply force to the first force-applying part in the axial direction of the engaging part.

[0029] Preferably, a connector is also fixedly connected to the end of the connector that is fixed to the outside, away from the other connector.

[0030] Preferably, when the molded part is long enough to require the addition of multiple extension sections, an opening is provided on the extension section to allow the functional component to extend out, and a limiting part is provided on the extension section to limit the position of the driving component. When the extension section is connected to the functional mechanism located at its front section, the limiting part is used to restrict the position of the driving component. That is, after the extension section is connected to the functional mechanism located at its front section, the functional mechanism cannot be adjusted and can only be maintained for grinding or support.

[0031] [Beneficial Effects] Compared with the prior art, the present invention provides a stretching and forming device for seamless steel pipes, which has the following beneficial effects: This seamless steel pipe stretching and forming equipment has a functional mechanism on one end of the mandrel that is not aligned with the blank. When the formed part has a certain length, the functional component inside the functional mechanism extends to contact the formed part to support the inside of the formed part during the stretching and forming process of the seamless steel pipe. Compared with using a single long mandrel, using multiple interconnected extended parts with functional mechanisms results in higher coaxiality after the connection of multiple extended parts, and the functional mechanism attached to it can form multi-point support inside the long formed part, thereby ensuring the forming accuracy of the inner wall of the long seamless steel pipe. On the other hand, when the functional component is a grinding block, the grinding effect on the inner wall of the molded part can be achieved by rotating the functional mechanism while the functional component is in contact with the molded part, thus avoiding the subsequent separate inner wall treatment process. Meanwhile, due to the modular design achieved by using extended components, the functional mechanisms on the extended components in different parts can be used for support or grinding depending on the actual implementation situation, so as to improve the process integration of the stretching and forming of seamless steel pipes. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the usage state of a stretching and forming equipment for seamless steel pipes according to a preferred embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram of the use of a stretching and forming equipment for seamless steel pipes according to the present invention.

[0034] Figure 3 This is a schematic diagram of the functional mechanism in a stretching and forming equipment for seamless steel pipes according to the present invention.

[0035] Figure 4 This is a structural cross-sectional diagram of the functional mechanism in a stretching and forming equipment for seamless steel pipes according to the present invention.

[0036] Figure 5 This is a schematic diagram of the moving transformation group in a stretching and forming equipment for seamless steel pipes according to the present invention.

[0037] Figure 6 This is a schematic diagram of the rotation transformation group in a stretching and forming equipment for seamless steel pipes according to the present invention.

[0038] Figure 7 This is a schematic diagram of the drive component in a stretching and forming device for seamless steel pipes according to the present invention. Figure 1 .

[0039] Figure 8 This is a schematic diagram of the drive component in a stretching and forming device for seamless steel pipes according to the present invention. Figure 2 .

[0040] Figure 9 This is a schematic diagram of the operation of the functional mechanisms in a stretching and forming equipment for seamless steel pipes according to the present invention.

[0041] Figure 10 This is a schematic diagram of the structure of the extended part in the stretching and forming equipment for seamless steel pipes of the present invention, as a preferred embodiment.

[0042] In the picture: 001. Blank; 002. Molded part; 1. Mandrel; 2. Functional mechanism; 3. Extension component; 11. Joint 1; 21. Support block; 22. Functional block; 23. Transformation mechanism; 24. Force-applying component one; 211. Contact department; 231. Movement conversion group; 232. Rotation conversion group; 233. Limiting component one; 234. Fixing part; 235. Driving component; 2311. Rotating component; 2312. Guide part; 2313. Second joint; 2314. Force-bearing part; 2321. Gear 1; 2322. Gear 2; 2323. Wheel frame; 23211, Joint Three; 23231. Joint 4; 2351. Connecting component; 2352. Force-applying component two; 2353. Limiting component two; 31. Opening; 32. Limiting part. Detailed Implementation

[0043] To make the technical means, creative features, achieved objectives, and functional effects of this invention readily understandable, the invention will be further described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0044] Example 1 To address the shortcomings of existing technologies, such as Figure 1 , 2 As shown, the present invention provides a stretching and forming equipment for seamless steel pipes, including a mandrel 1. A functional mechanism 2 is provided on one end of the mandrel 1 that is not aligned with the blank 001. The functional mechanism 2 is used to support the inner wall of the formed part 002. The stretching and forming equipment also includes an extension 3 that is provided with the functional mechanism 2. The end of the extension 3 that is not provided with the functional mechanism 2 can be connected to a functional mechanism 2 other than the functional mechanism 2.

[0045] Among them, the two relative radial directions refer to the two radial directions on the mandrel 1 being on the same straight line but in opposite directions; The stretching and forming equipment also includes a cold rolling device or a hot rolling device. In this embodiment, the main stretching and forming equipment for seamless steel pipes is not further limited. This is an optional setup made by those skilled in the art for the actual implementation situation. That is, in this embodiment, the mandrel 1 and the functional mechanism 2 can be applied to any seamless steel pipe production implementation scenario that requires stretching and forming using the mandrel 1.

[0046] It should be noted that in the process of stretching and forming seamless steel pipe, the blank 001 is moved and formed into the formed part 002 by acting on the mandrel 1. When the formed joint 11 is too long and needs to be supported, a functional mechanism 2 is added to one end of the mandrel 1 that is not aligned with the blank 001, and the formed part 002 is supported by the functional mechanism 2. In this embodiment, those skilled in the art will understand that an extension member 3 is installed for actual implementation, so that the multi-segment functional mechanism 2 and the extension member 3 can effectively support the molded part 002 during the molding process.

[0047] Specifically, such as Figure 3 As shown, a functional mechanism 2 for a stretching and forming equipment for seamless steel pipes is provided. The functional mechanism 2 includes at least two functional components, which are distributed on two opposite radial directions on the mandrel 1. The functional mechanism 2 also includes at least a transformation mechanism 23 for moving the functional components in the radial direction of the mandrel 1. In this embodiment, the functional component is taken as a support block 21.

[0048] In this embodiment, the transformation mechanism 23 can be any kind of transformation mechanism that can drive the functional component to move at least in the radial direction of the core rod 1. For example, it can be any kind of mechanism that can drive the functional component to perform equidistant relative / separate movement transformation that is well known and understood by those skilled in the art.

[0049] It should be noted that the present invention is a stretching and forming equipment for seamless steel pipes. Through the functional mechanism 2, in the unsupported state of the forming part 002, the support block 21 and the forming part 002 are in a non-contact state. In this state, the setting of the functional mechanism 2 will not interfere with the movement and forming of the forming part 002. If the functional mechanism 2 is to be used to support the molded part 002, in this embodiment, the transformation mechanism 23 moves at least two support blocks 21 in the radial direction of the mandrel 1 until at least two support blocks 21 come into contact with the molded part 002. This structural state is used to effectively support the molded part 002 during the seamless steel pipe forming process.

[0050] It is worth mentioning that by setting a functional mechanism 2 on one end of the mandrel 1 that does not meet the blank 001, when the forming part 002 has a certain length, the functional component inside the functional mechanism 2 extends out to contact the forming part 002 to support the inside of the forming part 002 during the stretching and forming process of the seamless steel pipe. Compared with using a single long mandrel 1, using multiple interconnected extended parts 3 with functional mechanisms 2 results in higher coaxiality after the multiple extended parts 3 are connected, and the functional mechanism 2 attached to it can form multi-point support inside the long forming part 002, thereby ensuring the forming accuracy of the inner wall of the long seamless steel pipe. On the other hand, when the functional component is a grinding block, the grinding effect on the inner wall of the molded part 002 can be achieved by rotating the functional mechanism 2 under the premise that the functional component is in contact with the molded part 002, thus avoiding the subsequent separate inner wall treatment process. Meanwhile, due to the modular design achieved by using the extended part 3, the functional mechanism 2 on the extended part 3 in different parts can be used for support or grinding depending on the actual implementation situation, so as to improve the process integration of the stretching and forming of seamless steel pipe.

[0051] As a preferred embodiment, such as Figure 3 As shown, a support block 21 for a seamless steel pipe stretching forming equipment has the following structure: a contact part 211 is provided on the side of the support block 21 that meets the forming part 002. The contact part 211 is a spherical object, which makes contact with the forming part 002. In the process of effectively supporting the forming part 002, the contact friction between the support block 21 and the forming part 002 can be minimized.

[0052] Furthermore, such as Figure 4 As shown, a transformation mechanism 23 is used in a stretching and forming equipment for seamless steel pipes. The transformation mechanism 23 includes a movement transformation group 231 for moving the support block 21 in the radial direction of the mandrel 1.

[0053] Furthermore, such as Figure 5 As shown, a moving conversion group 231 is used in the conversion mechanism 23 of a seamless steel pipe stretching forming equipment. The moving conversion group 231 includes a rotating member 2311, and a number of guide portions 2312 corresponding to the support block 21 are provided on the rotating member 2311. The guide portions 2312 are configured to rotate the rotating member 2311 to drive the support block 21 to move radially in the mandrel 1, provided that the support block 21 is restricted from circumferential movement.

[0054] Among them, the rotating component 2311 is a disk. In this embodiment, the rotating component 2311 can be rotatably connected to the outside of it; Guide section 2312 is as follows Figure 5The guide groove shown in this embodiment is formed by a shaft fixedly connected to the functional component, which slides and guides the guide part 2312 through the shaft.

[0055] It should be noted that this invention is a stretching and forming device for seamless steel pipes. Through the provided transformation mechanism 23, if it is necessary to change the support of the functional mechanism 2, in this embodiment, the positions of the two support blocks 21 are moved and changed by the moving transformation group 231, and the support blocks 21 are restricted to moving only radially based on the mandrel 1. During the process of moving and changing the position of the support block 21, the rotating member 2311 is rotated. Since the support block 21 is restricted to moving only in the radial direction of the mandrel 1, the guide part 2312 applies force to the corresponding support block 21 during the rotation of the rotating member 2311, thereby realizing the movement and change of the support block 21, so that the distance between at least two support blocks 21 in the radial direction of the mandrel 1 is changed until at least two support blocks 21 are in contact with the molded part 002, thus forming a contact support for the molded part 002.

[0056]

Example 2

[0057]

Example 3

[0058] It should be noted that the present invention is a stretching and forming equipment for seamless steel pipes. In this embodiment, the functional mechanism 2 is provided with both a support block 21 and a functional block 22, with the functional block 22 serving as a grinding block. In this embodiment, if the functional mechanism 2 is to be used for supporting / polishing the molded part 002, for example, if the previous structural state of the functional mechanism 2 was the support state, then the structural state of the functional mechanism 2 needs to be changed, that is, the positions of the support block 21 and the functional block 22 need to be adjusted: In the process of adjusting the position of the support block 21 and the functional block 22, in this embodiment, it refers to adjusting the orientation of the working surfaces on the support block 21 and the functional block 22. Since the support block 21 and the functional block 22 are coaxially arranged, by rotating the support block 21 and the functional block 22, the orientation of the support block 21 and the functional block 22 is changed until the working surface of either the support block 21 or the functional block 22 is relative to the inner wall of the molded part 002. When the support block 21 is facing the molded part 002 and the support block 21 is in contact with the molded part 002, the functional mechanism 2 is used to support the molded part 002. When the functional block 22 is facing the molded part 002 and the functional block 22 moves and acts on the functional mechanism 2, the functional mechanism 2 is used to polish the inner wall of the molded part 002.

[0059] Furthermore, and such Figure 4 As shown, a transformation mechanism 23 for a stretching and forming equipment for seamless steel pipes is provided. The transformation mechanism 23 further includes a rotation transformation group 232 for changing the orientation of two functional components in a single radial direction.

[0060] Furthermore, such as Figure 6 As shown, a rotational conversion group 232 is used in the conversion mechanism 23 of a seamless steel pipe stretching forming equipment. The rotational conversion group 232 includes a gear 2321 and a gear 2322 meshing with the gear 2321. The number of gears 2322 corresponds to the radial number on the mandrel 1 on which functional components are provided.

[0061] The number of gears 2322 corresponds to the number of radial components on the mandrel 1 with functional components. For example, there are two radial components on the mandrel 1 with functional components, meaning that there are two gears 2322. The number of functional components on a single radial component is independent of the number of gears 2322.

[0062] It should be noted that this invention is a stretching and forming device for seamless steel pipes. In this embodiment, the orientation of the support block 21 and the functional block 22 needs to be changed through the transformation mechanism 23. After the change, the radial position of the support block 21 / functional block 22 based on the mandrel 1 needs to be adjusted so that it acts on the formed part 002 for support / grinding. In this embodiment, the support block 21 and the functional block 22 are fixedly connected as one unit and coaxially connected to the gear 2322. If it is necessary to change the orientation of the support block 21 and the functional block 22, the gear 2321 is rotated. During the rotation of the gear 2321, the gear 2322 is driven to rotate synchronously. The rotation of the gear 2322 drives the support block 21 and the functional block 22, which are fixedly connected as one unit, to rotate, thereby changing the orientation of the support block 21 and the functional block 22.

[0063]

Example 4

[0064] In this embodiment, the limiting member 233 is rotatably connected to the fixing part 234. The fixing part 234 is the core rod 1.

[0065] Furthermore, and such Figure 5 As shown, a moving conversion group 231 for a stretching and forming equipment for seamless steel pipes, when the connecting member 2351 is a key shaft, provides a second connecting part 2313 and a third connecting part 23211 on the rotating member 2311 and the second connecting part 2313, which can be connected with the connecting member 2351.

[0066] And such as Figure 6 As shown, a rotation conversion assembly 232 for a stretch forming equipment for seamless steel pipes is provided. The rotation conversion assembly 232 further includes a wheel frame 2323, which is used to restrict the second gear 2322 from moving circumferentially based on the first gear 2321, and the wheel frame 2323 can be engaged with an externally fixed coupling member 2351.

[0067] In this embodiment, the wheel frame 2323 is rotatably connected to the rotating member 2311.

[0068] like Figure 7 As shown, a drive component 235 for a stretching and forming equipment for seamless steel pipes includes at least one connecting component 2351 fixed to the outside, and another connecting component 2351 rotatably connected to the connecting component 2351. The connecting component 2351 fixed to the outside can at least engage with a rotating component 2311 and a gear 2321, and the other connecting component 2351 can at least engage with an external non-rotatable part and a limiting component 233.

[0069] In this embodiment, the coupling 2351 is a key shaft, preferably a spline shaft; The externally fixed connecting member 2351 means that the connecting member 2351 can be fixedly connected to an external shaft, and the rotation of the entire driving member 235 can be controlled through the shaft; The external non-rotatable part refers to the part that restricts the rotation of the connector 2351 when it is engaged with the connector 2351. In this embodiment, the part is the joint portion 11 formed on the mandrel 1.

[0070] It should be noted that the present invention is a stretching and forming equipment for seamless steel pipes. In this embodiment, the basic adjustment process of the functional mechanism 2 is as follows: first, the orientation of the support block 21 and the functional block 22 is adjusted. After the orientation of the support block 21 and the functional block 22 is adjusted, the position of the support block 21 and the functional block 22 in the radial direction of the mandrel 1 is adjusted so that the support block 21 / functional block 22 makes contact with the forming part 002. Then, the rotation / movement of the support block 21 and the functional block 22 is restricted. In the state where the functional mechanism 2 is used to grind the forming part 002, the support block 21 and the functional block 22 can only move based on the circumferential direction of the mandrel 1. Orientation adjustment: In this embodiment, if it is necessary to adjust the orientation of the support block 21 and the functional block 22 first, such as Figure 9In the structural state shown, by moving the drive member 235, the connecting member 2351 fixed to the outside is engaged only with the gear 2321. Another connecting member 2351 rotatable with the connecting member 2351 is simultaneously engaged with the connecting part 11 and the limiting member 233. In this state, the support block 21 and the functional block 22 are restricted from moving circumferentially relative to the core rod 1, and the rotating member 2311 is not engaged with the drive member 235. Alternatively, when the length of the connecting member 2351 engaged with the connecting part 11 is sufficient, the rotating member 2311 is simultaneously engaged with the connecting member 2351 engaged with the connecting part 11. In this state, by rotating the drive member 235, the drive member 235 drives only the gear 2321 to rotate. As the gear 2321 rotates, the orientation of the support block 21 and the functional block 22 changes. Radial adjustment: Following the above-described orientation adjustment process, the position of the support block 21 / functional block 22 in the radial direction of the mandrel 1 needs to be adjusted. At this time, the drive member 235 needs to be moved so that the connecting member 2351 fixed to the outside engages with the rotating member 2311 but not with the gear 2321. At the same time, the connecting member 2351, which can rotate relative to the connecting member 2351, should continue to maintain the engagement state with the connecting part 11 and the limiting member 233. In this state, the limiting member 233 still restricts the circumferential movement of the support block 21 and the functional block 22. By rotating the drive member 235, the drive member 235 can drive the rotating member 2311 to rotate, thereby realizing the adjustment of the position of the support block 21 and the functional block 22 in the radial direction of the mandrel 1. Circumferential movement: Following the aforementioned radial adjustment process, with the functional block 22, acting as a grinding block, facing the molded part 002, i.e., with the functional mechanism 2 used to grind the molded part 002, and with the functional block 22 in contact with the molded part 002, the functional block 22 needs to be rotated circumferentially based on the mandrel 1 to achieve the grinding state. By moving the drive member 235, the connecting member 2351, which is fixed to the outside, simultaneously engages with the rotating member 2311 and the gear 2321. The rotating member 2311, which can rotate relative to the rotating member 2311, should disengage from the state of simultaneously engaging with the connecting part 11 and the limiting member 233, so that the freely rotating connecting member 2351 should only contact either the connecting part 11 or the limiting member 233. In this state, the rotation of the limiting member 233 will not be restricted, so that the support block 21 and the functional block 22 as a whole can move circumferentially on the mandrel 1.

[0071] In a preferred embodiment, this example demonstrates an operational state where the externally fixed coupling 2351 engages only with the rotating member 2311 / gear 2321 or simultaneously with both the rotating member 2311 and gear 2321. If only one coupling 2351 is used, during directional adjustment, radial adjustment, and circumferential movement, such as... Figure 9 In the structural state shown, the driving member 235 moves towards the joint 11, then continues to move towards the joint 11, and finally moves away from the joint 11. In this moving mechanism, there are opposite moving strokes. To make the moving stroke of the driving member 235 more continuous, the entire adjustment process of the functional mechanism 2 is on the continuous moving path of the driving member 235. like Figure 7 , 9 As shown, another connector 2351 is provided at the end of the connector 2351 that is fixed to the outside, away from the self-rotating connector 2351. The two connectors 2351 that are not self-rotating are fixedly connected, and there is a smooth rod section between them that cannot engage with the gear 2321 or the rotating member 2311. Thus, as Figure 9 In the structural state shown, in the orientation adjustment state, the engaging member 2351 adjacent to the engagement portion 11 engages only with the gear 2321. In the radial adjustment state, the driving member 235 moves toward the engagement portion 11, causing the engaging member 2351 adjacent to the engagement portion 11 to engage with the rotating member 2311 and disengage from the gear 2321. Then, in the circumferential movement state, the driving member 235 continues to move toward the engagement portion 11, causing the engaging member 2351 adjacent to the engagement portion 11 to remain engaged with the rotating member 2311, while the engaging member 2351 away from the engagement portion 11 simultaneously engages with the gear 2321.

[0072] As a preferred embodiment, specifically, such as Figure 5 , 8 As shown, a functional mechanism 2 for a stretching and forming equipment for seamless steel pipes is provided. The functional mechanism 2 also includes a force-applying member 24, which is configured to restrict the rotating member 2311 from rotating during the process of adjusting the orientation of the functional member.

[0073] Furthermore, the force-applying member 24 is an elastic member, and a force-receiving part 2314 that cooperates with the force-applying member 24 is provided on the rotating member 2311. When the force-receiving part 2314 engages with the force-applying member 24, the rotating member 2311 is restricted to be non-rotatable. A force-applying member 2352 is provided on the driving member 235 at a part that does not affect its engagement. When the force-applying member 2352 applies force to the force-applying member 24, the force-applying member 24 disengages from the force-receiving part 2314 to form an engagement.

[0074] Among them, the force-applying component 24 is fixedly connected to the fixing part 234. In this embodiment, the fixing part 234 can be the core rod 1. In this embodiment, the second force-applying component 2352 can be a part that is rotatably connected to the driving component 235 without affecting its engagement. For example, it can be a smooth rod section between the two connecting components 2351. When the second force-applying component 2352 is rotatably connected to the driving component 235, the rotation of the connecting component 2351 will not interfere with the force applied by the second force-applying component 2352. That is, the second force-applying component 2352 will only apply force to the first force-applying component 24 in the axial direction of the connecting component 2351.

[0075] It should be noted that in this embodiment, a friction clutch mechanism with a force-applying component 24 can be used instead of the key clutch mechanism of the long shaft coupling component 2351. During the orientation adjustment process, in order to ensure that the rotating component 2311 can remain stationary, in the position state of the orientation adjustment drive component 235, the force-applying component 24 is not subjected to the force-applying component 2352, that is, the force-applying component 24 normally applies force to the rotating component 2311, and the orientation adjustment operation can be carried out in this state. Then, during the radial adjustment process, since it is necessary to rotate the rotating member 2311, the driving member 235 is moved. During the movement of the driving member 235, the second force-applying member 2352 on it applies pressure to the first force-applying member 24, so that the second force-applying member 2352 applies force to the first force-applying member 24, causing the first force-applying member 24 to disengage from the force-receiving part 2314 on the rotating member 2311. In this state, the rotation of the rotating member 2311 is not restricted.

[0076] As a preferred embodiment, such as Figure 10 As shown, when the molded part 002 is long enough to require the addition of multiple extension parts 3, an opening 31 is provided on the extension part 3 to allow the functional parts to extend out, and a limiting part 32 is provided on the extension part 3 to limit the drive part 235. When the extension part 3 is connected to the functional mechanism 2 located at its front end, the limiting part 32 is used to restrict the position of the drive part 235. That is, after the extension part 3 is connected to the functional mechanism 2 located at its front end, the functional mechanism 2 cannot be adjusted, and can only be maintained for grinding or support.

[0077] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A stretching and forming apparatus for seamless steel pipes, comprising a mandrel (1), characterized in that: The mandrel (1) is provided with a functional mechanism (2) at one end that is not aligned with the blank (001). The functional mechanism (2) is used to support the inner wall of the molded part (002). The functional mechanism (2) includes at least two functional components, which are distributed on two opposite radial directions on the mandrel (1). The functional mechanism (2) also includes at least a transformation mechanism (23) for moving the functional components in the radial direction of the mandrel (1). The functional components are support blocks (21) or grinding blocks. The stretching forming equipment also includes an extension (3) provided with the functional mechanism (2). The end of the extension (3) that is not provided with the functional mechanism (2) can be connected to a functional mechanism (2) other than the functional mechanism (2).

2. The stretching and forming equipment for seamless steel pipes according to claim 1, characterized in that: The transformation mechanism (23) includes a movement transformation group (231) for moving the support block (21) radially in the mandrel (1). The movement transformation group (231) includes a rotating member (2311) and a number of guide portions (2312) corresponding to the support block (21) are provided on the rotating member (2311). The guide portions (2312) are configured to rotate the rotating member (2311) to drive the support block (21) to move radially in the mandrel (1) under the premise that the support block (21) is restricted from circumferential movement.

3. The stretching and forming equipment for seamless steel pipes according to claim 2, characterized in that: At least two functional components are provided in a single radial direction of the mandrel (1), and the working surfaces of the at least two functional components are not in the same orientation. The at least two functional components are configured such that when at least one functional component is a support block (21), the other support block (21) is a grinding block. The transformation mechanism (23) further includes a rotation transformation group (232) for changing the orientation of the two functional components in a single radial direction.

4. The stretching and forming equipment for seamless steel pipes according to claim 3, characterized in that: The rotation transformation group (232) includes a gear one (2321) and a gear two (2322) meshes with the gear one (2321). The number of gear two (2322) corresponds to the radial number on the mandrel (1) on which the functional component is provided.

5. The stretching and forming equipment for seamless steel pipes according to claim 4, characterized in that: The transformation mechanism (23) further includes a limiting member (233), which is configured to restrict the functional member from moving in the circumferential direction of the mandrel (1) during the process of orienting / radial adjustment of the functional member.

6. The stretching and forming equipment for seamless steel pipes according to claim 5, characterized in that: The transformation mechanism (23) further includes a drive member (235), which includes at least one connecting member (2351) fixed to the outside, and another connecting member (2351) is rotatably connected to the connecting member (2351). The connecting member (2351) fixed to the outside can at least engage with the rotating member (2311) and the gear (2321), and the other connecting member (2351) can at least engage with the external non-rotatable part and the limiting member (233).

7. The stretching and forming equipment for seamless steel pipes according to claim 6, characterized in that: The rotation conversion assembly (232) further includes a wheel carrier (2323), which restricts the second gear (2322) from moving circumferentially based on the first gear (2321), and the wheel carrier (2323) can engage with the externally fixed coupling member (2351).

8. The stretching and forming equipment for seamless steel pipes according to claim 6, characterized in that: The functional mechanism (2) further includes a force-applying component (24), which is configured to restrict the rotating component (2311) from rotating during the process of adjusting the orientation of the functional component.

9. The stretching and forming equipment for seamless steel pipes according to claim 8, characterized in that: The first force-applying component (24) is an elastic component. A force-receiving part (2314) that cooperates with the first force-applying component (24) is provided on the rotating component (2311). When the force-receiving part (2314) engages with the first force-applying component (24), the rotating component (2311) is restricted to be non-rotatable. A second force-applying component (2352) is provided on the driving component (235) at a part that does not affect its engagement. When the second force-applying component (2352) applies force to the first force-applying component (24), the first force-applying component (24) disengages from the force-receiving part (2314) to form an engagement.

10. The stretching and forming equipment for seamless steel pipes according to claim 6, characterized in that: A connector (2351) is also fixedly connected to the end of the connector (2351) that is fixed to the outside, away from the other connector (2351).

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