A steel pipe finishing device

Abstract

This invention provides a steel pipe precision forming device, comprising a base, a precision forming frame, guide rollers, a sliding frame, a swing frame, and a forming roller. The device includes a base on which a feeding unit and a precision forming frame are sequentially arranged along the conveying direction of the steel pipe. A sliding frame is slidably mounted vertically on the precision forming frame, and a guide roller is rotatably mounted below the sliding frame. Two swing frames are arranged opposite each other on the sliding frame along the axis of the guide roller. A forming roller is mounted at the lower end of each swing frame. When producing steel pipes of different specifications, different arc segments on the forming roller can be changed by adjusting the angle of the swing frames, suitable for extruding steel pipes of different shapes. When producing steel pipes of different shapes, there is no need to change the forming roller, and the operation is convenient, reducing the number of forming rollers of various specifications and lowering production costs.

Description

Technical Field

[0001] This invention belongs to the technical field of steel pipe manufacturing equipment, specifically relating to a steel pipe precision forming device. Background Technology

[0002] In the roll forming process, steel pipes are formed by extruding steel strips using forming rollers on both sides. After being extruded through multiple forming stands, the joints are welded together using welding equipment, ultimately forming a steel pipe. Before entering the welding process, the steel pipe passes through a finishing section, where its final shape is primarily determined by the shape of the forming rollers. Therefore, different specifications of forming rollers need to be changed when rolling steel pipes of different sizes. However, the forming rollers are costly to manufacture and heavy, and changing them wastes manpower and resources, leading to increased steel pipe production costs. Summary of the Invention

[0003] This invention provides a steel pipe precision forming device, which aims to solve the problem of high production costs in the production of steel pipes of different specifications in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a steel pipe precision forming device, comprising:

[0005] A base, on which a feeding unit is provided;

[0006] A precision forming frame is mounted on the base and located behind the feeding unit;

[0007] Guide rollers are rotatably mounted on the precision forming frame;

[0008] A sliding frame is mounted on the precision forming machine frame and located above the guide roller. The sliding frame has a degree of freedom for vertical adjustment on the precision forming machine frame.

[0009] Two swing frames are arranged at intervals along the axial direction of the guide roller. The swing frames are mounted on the sliding frame, and the swing axis of the swing frames is arranged along the conveying direction of the steel pipe.

[0010] A forming roller is rotatably mounted on the swing frame, and an arc-shaped surface for forming steel pipes is provided on the outer side of the forming roller.

[0011] In one possible implementation, a pusher is slidably mounted on the sliding frame along the axis of the guide roller, the swing frame is oscillatingly mounted on the pusher, and an adjustment component for adjusting the position of the pusher is provided between the pusher and the sliding frame.

[0012] In one possible implementation, the regulating component includes:

[0013] The limiting block is fitted onto the side wall of the push frame;

[0014] The rotating rod is rotatably mounted on the sliding frame and threadedly connected to the limiting block.

[0015] In one possible implementation, the push frame is provided with an arc-shaped groove centered on the swing axis of the swing frame, the swing frame is provided with an arc-shaped guide rail slidably disposed inside the arc-shaped groove, and a drive assembly for pushing the swing frame to swing on the push frame is also provided between the swing frame and the push frame.

[0016] In one possible implementation, the driving component includes:

[0017] The worm gear is rotatably mounted on the push frame;

[0018] A worm gear is fixedly connected to the swing frame. The worm gear and the worm are meshed with each other, and the axis of the worm gear is coaxial with the axis of the arc-shaped guide rail.

[0019] In one possible implementation, a connecting shaft is rotatably mounted on the swing frame, with one end of the connecting shaft rotatably mounted on the swing frame and the other end connected to the forming roller.

[0020] In one possible implementation, a bearing is provided between the swing frame and the connecting shaft. The swing frame has a mounting hole for installing the bearing. A limiting platform protrudes from the inner wall of the mounting hole. Bearings are provided on both sides of the limiting platform. A dustproof ring is provided at the end of the bearing away from the limiting platform. The dustproof ring is slidably engaged with the connecting shaft. The end of the connecting shaft is threadedly connected to a clamping member for pressing the dustproof ring onto the bearing.

[0021] In one possible implementation, the forming roller is slidably disposed on the connecting shaft, and the end of the connecting shaft is provided with a boss for limiting the forming roller. The end of the connecting shaft is detachably mounted with a pressure plate for pressing the forming roller against the boss, and the forming roller is recessed with a groove for accommodating the pressure plate.

[0022] In one possible implementation, the feeding unit includes:

[0023] A feeding frame, on which an upper extrusion roller and a lower extrusion roller are rotatably mounted, the upper extrusion roller and the lower extrusion roller each being composed of two roller bodies with adjustable spacing;

[0024] A guide frame is disposed between the feeding frame and the precision forming frame to guide the conveying direction of the steel pipe.

[0025] In one possible implementation, a drive shaft is rotatably mounted on the feeder frame, one end of the drive shaft is rotatably mounted on the feeder frame, and a connecting sleeve is rotatably mounted on the outer side of the other end of the drive shaft. Two rollers are respectively mounted on the drive shaft and the connecting sleeve. The feeder frame is also provided with an adjustment unit for driving the connecting sleeve and the drive shaft to move along the axis of the drive shaft.

[0026] The solution shown in this application, compared with the prior art, features a base on which a feeding unit and a precision forming frame are sequentially arranged along the conveying direction of the steel pipe. A sliding frame is slidably mounted vertically on the precision forming frame, and a guide roller is rotatably mounted below the sliding frame. Two swing frames are arranged opposite each other on the sliding frame along the axis of the guide roller. A forming roller is mounted at the lower end of the swing frames. The extrusion surface on the outer side of the forming roller is formed by multiple arc segments connected sequentially. The axes of the multiple arc segments are parallel and spaced apart. The shape of the arc segments is designed according to the shape of the product. When it is necessary to change to produce steel pipes of different specifications, different arc segments on the forming roller can be replaced by adjusting the angle of the swing frames, making it suitable for extruding steel pipes of different shapes. When producing steel pipes of different shapes, there is no need to change the forming roller, which is convenient to operate, reduces the number of forming rollers of various specifications, and lowers production costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the steel pipe precision forming device provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the precision forming frame provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the driving component provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the adjustment component provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the installation structure of the forming roller provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the installation structure of the roller body provided in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Base; 2. Feeding unit; 21. Feeding frame; 211. Rotating shaft; 212. Connecting sleeve; 213. Roller body; 214. First sliding sleeve; 215. Second sliding sleeve; 22. Guide frame; 3. Precision forming frame; 31. Guide roller; 32. Sliding frame; 321. Push frame; 322. Limiting block; 323. Rotating rod; 33. Swinging frame; 331. Arc-shaped guide rail; 332. Worm gear; 333. Worm wheel; 334. Limiting platform; 335. Dustproof ring; 336. Pressing component; 34. Forming roller; 35. Connecting shaft; 351. Bearing; 352. Pressure plate. Detailed Implementation

[0035] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0036] Please refer to the following: Figures 1 to 6 The steel pipe precision forming device provided by the present invention will now be described. The steel pipe precision forming device includes a base 1, a precision forming frame 3, a guide roller 31, a sliding frame 32, a swing frame 33, and a forming roller 34. A feeding unit 2 is provided on the base 1; the precision forming frame 3 is mounted on the base 1 and located behind the feeding unit 2; the guide roller 31 is rotatably mounted on the precision forming frame 3; the sliding frame 32 is mounted on the precision forming frame 3 and located above the guide roller 31, and the sliding frame 32 has a degree of freedom for vertical adjustment on the precision forming frame 3; there are two swing frames 33, which are spaced apart along the axial direction of the guide roller 31, and the swing frames 33 are mounted on the sliding frame 32, with their swing axes arranged along the conveying direction of the steel pipe; the forming roller 34 is rotatably mounted on the swing frame 33, and an arc-shaped surface for forming the steel pipe is provided on the outer side of the forming roller 34.

[0037] Compared with the prior art, the steel pipe precision forming device provided in this embodiment has a base 1, on which a feeding unit 2 and a precision forming frame 3 are sequentially arranged along the conveying direction of the steel pipe. A sliding frame 32 is slidably arranged vertically on the precision forming frame 3, and a guide roller 31 is rotatably arranged below the sliding frame 32. Two swing frames 33 are arranged opposite each other on the sliding frame 32 along the axis of the guide roller 31. A forming roller 34 is installed at the lower end of the swing frame 33. The extrusion surface on the outer side of the forming roller 34 is formed by multiple arc segments connected sequentially. The axes of the multiple arc segments are arranged parallel and spaced apart. The shape of the arc segments is designed according to the shape of the product. When it is necessary to change the production of steel pipes of different specifications, the angle of the swing frame 33 can be adjusted to change different arc segments on the forming roller 34, which is suitable for extruding steel pipes of different shapes. When producing steel pipes of different shapes, it is not necessary to change the forming roller 34, and the operation is convenient, reducing the number of forming rollers 34 of various specifications and lowering production costs.

[0038] Specifically, in this embodiment, the forming rollers 34 on the two swing frames 33 are arranged opposite to each other and symmetrically to form an extrusion space for forming steel pipes.

[0039] In some embodiments, the sliding frame 32 may be adopted as follows: Figure 2 , Figure 3 and Figure 4 The structure shown. See also... Figure 2 , Figure 3 and Figure 4 A push frame 321 is slidably mounted on the sliding frame 32 along the axis of the guide roller 31. A swing frame 33 is swayed and mounted on the push frame 321, and an adjustment assembly for adjusting the position of the push frame 321 is provided between the push frame 321 and the sliding frame 32. There are two push frames 321, spaced apart along the axis of the guide roller 31 and slidably mounted on the sliding frame 32. The swing frame 33 is mounted on the push frame 321 and can adjust the distance between the two forming rollers 34. When it is necessary to change to produce steel pipes of different specifications, the height of the sliding frame 32 can be adjusted. The angles of the two push frames 321 and the swing frame 33 can be adjusted in multiple directions, making it suitable for the production of steel pipes of various specifications and improving the applicability of the precision forming machine frame 3.

[0040] In some embodiments, the above-described regulating component may employ, for example... Figure 4 The structure shown. See also Figure 4The adjusting assembly includes a limiting block 322 and a rotating rod 323. The limiting block 322 is fitted onto the side wall of the push frame 321; the rotating rod 323 is rotatably mounted on the sliding frame 32 and threadedly connected to the limiting block 322. A slot for fitting the limiting block 322 is provided on the side wall of the push frame 321, and the outer surface of the limiting block 322 slides against the inner wall of the slot. A baffle for limiting the limiting block 322 within the slot is also provided on the side wall of the push frame 321, and the baffle is bolted to the side wall of the push frame 321. A clearance hole communicating with the slot is provided on the push frame 321, and the rotating rod 323 is located inside the clearance hole. Thus, when the rotating rod 323 is rotated, the limiting block 322 can move along the axis of the rotating rod 323, causing the push frame 321 to move together.

[0041] In some embodiments, the aforementioned swing frame 33 may be adopted as follows: Figure 3 The structure shown. Participate Figure 3 The push frame 321 has an arc-shaped groove centered on the swing axis of the swing frame 33. The swing frame 33 has an arc-shaped guide rail 331 slidably disposed inside the arc-shaped groove. A drive assembly for pushing the swing frame 33 to swing on the push frame 321 is also provided between the swing frame 33 and the push frame 321. Arc-shaped guide rails 331 are provided on both sides of the swing frame 33 along the swing axis. The corresponding arc-shaped groove is provided on the push frame 321, which can effectively utilize the space on the sliding frame 32. The drive assembly can drive the arc-shaped guide rail 331 to slide inside the arc-shaped groove to complete the swing of the swing frame 33. The structure is simple and easy to assemble and process.

[0042] In some embodiments, the aforementioned driving component may employ, for example... Figure 3 The structure shown. See also Figure 3 The drive assembly includes a worm gear 332 and a worm wheel 333. The worm gear 332 is rotatably mounted on the push frame 321; the worm wheel 333 is fixedly connected to the swing frame 33, and the worm wheel 333 and worm gear 332 are meshed with each other, with the axis of the worm wheel 333 coaxial with the axis of the arc-shaped guide rail 331. The worm wheel 333 adopts a semi-circular ring structure, with an arc-shaped structure at the top of the swing frame 33 that matches the outer shape of the inner ring of the worm wheel 333. This allows the worm wheel 333 to be fixedly mounted to the top of the swing frame 33 by bolts. The worm gear 332 is rotatably mounted on the push frame 321, and rotating the worm gear 332 drives the worm wheel 333 to rotate, thereby changing the angle of the swing frame 33.

[0043] Preferably, in this embodiment, the pusher frame 321 has a box structure, with the limiting block 322 and the worm gear 332 located inside the box, serving a dustproof function. The top of the box is a detachable cover. The worm gear 332 is rotatably mounted on two opposite side walls of the box. Furthermore, the end of the worm gear 332 and the end of the rotating rod 323 are located on the same side of the precision forming frame 3. This facilitates adjusting the position of the pusher frame 321 and the angle of the swing frame 33 on the same side of the precision forming frame 3.

[0044] In some embodiments, the aforementioned swing frame 33 may be adopted as follows: Figure 2 , Figure 3 and Figure 5 The structure shown. See also... Figure 2 , Figure 3 and Figure 5 A connecting shaft 35 is rotatably mounted on the swing frame 33. One end of the connecting shaft 35 is rotatably mounted on the swing frame 33, and the other end is connected to the forming roller 34. The two forming rollers 34 are located between the two swing frames 33. The location of the forming rollers 34 at the end of the connecting shaft 35 saves space between the two forming rollers 34, minimizing the distance between them. This facilitates the subsequent forming processing of small steel pipes.

[0045] In some embodiments, the connecting shaft 35 may be as follows: Figure 5 The structure shown. See also Figure 5 A bearing 351 is provided between the swing frame 33 and the connecting shaft 35. The swing frame 33 has mounting holes for installing the bearings 351. A limiting platform 334 protrudes from the inner wall of the mounting hole. Bearings 351 are provided on both sides of the limiting platform 334. A dustproof ring 335 is provided at the end of the bearing 351 away from the limiting platform 334. The dustproof ring 335 slides with the connecting shaft 35, and a clamping member 336 is threadedly connected to the end of the connecting shaft 35 to press the dustproof ring 335 onto the bearing 351. The mounting holes for installing the bearings 351 on both sides of the swing frame 33, and the limiting platform 334 in the middle of the mounting holes, with bearings 351 on both sides of the limiting platform 334, increase the contact area between the limiting platform 334 and the connecting shaft 35, thereby improving the connection strength between the connecting shaft 35 and the swing frame 33. Meanwhile, dustproof rings 335 are provided on the outer sides of the two bearings 351, and steps are provided on the connecting shaft 35 to prevent the dustproof rings 335 from moving towards the guide roller 31. One dustproof ring 335 is limited by the steps, and the other dustproof ring 335 is limited by the clamping member 336. In this way, the two bearings 351 are fixedly installed on the swing frame 33, which is simple in structure and facilitates the disassembly and assembly of the connecting shaft 35.

[0046] In some embodiments, the connecting shaft 35 may be as follows: Figure 5 The structure shown. See also Figure 5 The forming roller 34 is slidably mounted on the connecting shaft 35, and the end of the connecting shaft 35 is provided with a boss for limiting the forming roller 34. A pressure plate 352 for pressing the forming roller 34 against the boss is detachably mounted on the end of the connecting shaft 35. The forming roller 34 has a recessed groove for accommodating the pressure plate 352. The forming roller 34 is provided with a guide hole that slides with the connecting shaft 35. When installing the forming roller 34, it can be fitted onto the connecting shaft 35, with the end of the forming roller 34 abutting against the end face of the boss. Then, the pressure plate 352 presses the forming roller 34 against the end face of the boss, thus fixing the forming roller 34. Simultaneously, the pressure plate 352 is located inside the forming roller 34, saving space between the two forming rollers 34 and facilitating adjustments to the distance between them. The structure is simple, facilitating the installation and disassembly of the forming roller 34, and simplifying future maintenance.

[0047] In some embodiments, the feeding unit 2 described above may employ, for example... Figure 1 The structure shown. See also Figure 1 The feeding unit 2 includes a feeding frame 21 and a guide frame 22. An upper extrusion roller and a lower extrusion roller are rotatably mounted on the feeding frame 21, each consisting of two roller bodies 213 with adjustable spacing. The guide frame 22 is positioned between the feeding frame 21 and the finishing frame 3, guiding the conveying direction of the steel pipe. The guide frame 22 includes two movable frames arranged along the axis of the guide roller 31. The position of the movable frames on the guide frame 22 along the axis of the guide roller 31 is adjustable. Both movable frames are threaded onto the same drive shaft, and the threaded holes on the two movable frames rotate in opposite directions. A height-adjustable mounting frame is provided on the movable frame, and side rollers are rotatably mounted on the mounting frame, with two side rollers used to guide the movement of the steel pipe. Adjustment of the position between the mounting frame and the movable frames allows for the conveying of steel pipes of different specifications.

[0048] Specifically, in this embodiment, both the upper and lower extrusion rollers on the feeding frame 21 are composed of two roller bodies 213, thereby allowing the external dimensions of the processed steel pipe to be changed by adjusting the distance between the two roller bodies 213. The roller bodies 213 do not need to be replaced during changes to the steel pipe production specifications.

[0049] Preferably, in this embodiment, the upper extrusion roller has a degree of freedom to be adjusted vertically on the feeder frame 21. The adjustment method adopts existing technology and will not be described here.

[0050] In some embodiments, the above-mentioned feeder frame 21 may be adopted as follows: Figure 1 , Figure 6The structure shown. See also... Figure 1 , Figure 6 A drive shaft is rotatably mounted on the feeding frame 21. One end of the drive shaft is rotatably mounted on the feeding frame 21, and a connecting sleeve 212 is rotatably mounted on the outer side of the other end of the drive shaft. Two rollers 213 are respectively mounted on the drive shaft and the connecting sleeve 212. The feeding frame 21 is also equipped with an adjustment unit for driving the connecting sleeve 212 and the drive shaft to move along the axis of the drive shaft. The connecting sleeve 212 is located outside the drive shaft and can move relative to the drive shaft along the axis of the drive shaft. There are two rotating shafts 211, which are used to install the upper extrusion roller and the lower extrusion roller, respectively. Taking the installation method of the upper extrusion roller as an example, a first sliding sleeve 214 and a second sliding sleeve 215 are slidably mounted on the feeding frame 21 along the axis of the drive shaft. The first sliding sleeve 214 is connected to the drive shaft through a bearing 351. The second sliding sleeve 215 is connected to the connecting sleeve 212 through a bearing 351. The connecting sleeve 212 is in sliding engagement with the drive shaft. The two rollers 213 are respectively mounted on the connecting sleeve 212 and the drive shaft via flanges and bolts. Worm gears 333 are threadedly connected to the outer sides of both the first and second sliding sleeves. When the worm gears 333 rotate, they drive the first and second sliding sleeves to move along the axis of the drive shaft. A worm 332 is meshed on the outer side of the worm gears 333. Rotating the worm 332 drives the worm gears 333 to rotate, thereby moving either the first or second sliding sleeve to adjust the distance between the two rollers 213. When changing to produce steel pipes of different specifications, the size of the produced steel pipes can be changed by adjusting the distance between the two rollers 213. This allows for the production of steel pipes of different specifications without changing the rollers 213, saving labor and production costs.

[0051] Preferably, in this embodiment, an anti-rotation roller for preventing the steel pipe from rotating is rotatably mounted on the precision forming frame 3. The anti-rotation roller is mounted on the sliding frame 32, and the anti-rotation roller on the sliding frame 32 can be adjusted vertically.

[0052] The thickness of the anti-rotation roller gradually decreases towards the direction away from its axis. Located at the feed end of the forming frame 3, it guides the steel pipe by positioning it inside the joint before the pipe enters the frame, preventing rotation and ensuring the quality of subsequent welding.

[0053] Preferably, in this embodiment, the position of the anti-rotation roller is moved up and down by a lead screw. The anti-rotation roller is rotatably mounted on the connecting frame, the lead screw is threadedly connected to the connecting frame, and is rotatably mounted on the sliding frame 32.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A steel pipe precision forming device, characterized in that, include: A base (1) is provided with a feeding unit (2); The precision forming frame (3) is mounted on the base (1) and located behind the feeding unit (2); Guide rollers (31) are rotatably mounted on the precision forming frame (3); A sliding frame (32) is mounted on the precision forming frame (3) and located above the guide roller (31). The sliding frame (32) has a degree of freedom to be adjusted vertically on the precision forming frame (3). Two swing frames (33) are arranged at intervals along the axial direction of the guide roller (31). The swing frames (33) are mounted on the sliding frame (32), and the swing axis of the swing frames (33) is arranged along the conveying direction of the steel pipe. A forming roller (34) is rotatably mounted on the swing frame (33). The outer side of the forming roller (34) is provided with an arc-shaped surface for forming steel pipes. The extrusion surface on the outer side of the forming roller (34) is formed by connecting multiple arc-shaped segments in sequence. The axes of the multiple arc-shaped segments are arranged in parallel at intervals. A pusher frame (321) is slidably disposed on the sliding frame (32) along the axis of the guide roller (31), and the swing frame (33) is swayed on the pusher frame (321). An adjustment component for adjusting the position of the pusher frame (321) is provided between the pusher frame (321) and the sliding frame (32).

2. The steel pipe precision forming device as described in claim 1, characterized in that, The adjustment component includes: The limiting block (322) is fitted onto the side wall of the push frame (321); The rotating rod (323) is rotatably mounted on the sliding frame (32) and threadedly connected to the limiting block (322).

3. The steel pipe precision forming device as described in claim 1, characterized in that, The push frame (321) is provided with an arc-shaped groove centered on the swing axis of the swing frame (33). The swing frame (33) is provided with an arc-shaped guide rail (331) slidably disposed inside the arc-shaped groove. A drive assembly for pushing the swing frame (33) to swing on the push frame (321) is also provided between the swing frame (33) and the push frame (321).

4. The steel pipe precision forming device as described in claim 3, characterized in that, The driving component includes: The worm gear (332) is rotatably mounted on the pusher frame (321); The worm gear (333) is fixedly connected to the swing frame (33), and the worm gear (333) is meshed with the worm (332). The axis of the worm gear (333) is coaxial with the axis of the arc-shaped guide rail (331).

5. The steel pipe precision forming device as described in claim 1, characterized in that, A connecting shaft (35) is rotatably mounted on the swing frame (33). One end of the connecting shaft (35) is rotatably mounted on the swing frame (33), and the other end is connected to the forming roller (34).

6. The steel pipe precision forming device as described in claim 5, characterized in that, A bearing (351) is provided between the swing frame (33) and the connecting shaft (35). The swing frame (33) is provided with a mounting hole for mounting the bearing (351). A limiting platform (334) protrudes from the inner wall of the middle of the mounting hole. Bearings (351) are provided on both sides of the limiting platform (334). A dustproof ring (335) is provided at the end of the bearing (351) away from the limiting platform (334). The dustproof ring (335) is slidably engaged with the connecting shaft (35), and a clamping member (336) for pressing the dustproof ring (335) onto the bearing (351) is threaded to the end of the connecting shaft (35).

7. The steel pipe precision forming device as described in claim 5, characterized in that, The forming roller (34) is slidably disposed on the connecting shaft (35), and the end of the connecting shaft (35) is provided with a boss for limiting the forming roller (34). The end of the connecting shaft (35) is detachably mounted with a pressure plate (352) for pressing the forming roller (34) against the boss. The forming roller (34) is recessed with a groove for accommodating the pressure plate (352).

8. The steel pipe precision forming apparatus as described in claim 1, characterized in that, The feeding unit (2) includes: Feeder frame (21), on which an upper extrusion roller and a lower extrusion roller are rotatably mounted, the upper extrusion roller and the extrusion roller are both composed of two roller bodies (213) with adjustable spacing; A guide frame (22) is disposed between the feeding frame (21) and the precision forming frame (3) to guide the conveying direction of the steel pipe.

9. The steel pipe precision forming apparatus as described in claim 8, characterized in that, A drive shaft is rotatably mounted on the feeder frame (21). One end of the drive shaft is rotatably mounted on the feeder frame (21), and a connecting sleeve (212) is rotatably mounted on the outer side of the other end of the drive shaft. Two rollers (213) are respectively mounted on the drive shaft and the connecting sleeve (212). An adjustment unit for driving the connecting sleeve (212) and the drive shaft to move along the axis of the drive shaft is also provided on the feeder frame (21).

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