A feeding mechanism for a steel pipe forming machine

Abstract

The utility model discloses a kind of feeding mechanisms for steel pipe forming machine, it is related to the technical field of feeding mechanisms for steel pipe forming machine, including: substrate; first roll forming assembly, second roll forming assembly and third roll forming assembly are sequentially assembled on the substrate along the direction of steel pipe operation, for the shaping and feeding of steel pipe from sheet to tubular shape.The utility model adopts gradual change, and the segmented operation of multistage roll forming assembly is matched, and steel band can be gradually and gradually bent into the shape and pipe diameter required, while guaranteeing high production efficiency and equipment reliability, the forming efficiency of steel pipe, mechanical performance and quality are greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of feeding mechanisms for steel pipe forming machines, specifically a feeding mechanism for steel pipe forming machines. Background Technology

[0002] Steel pipe forming is mainly applicable to hollow structural parts with circular, rectangular or irregular cross-sections that vary along the workpiece axis. The most common type is circular steel pipe forming, which mainly adopts the three-point bending principle and forms the pipe step by step in the order of C-shaped and O-shaped. In order to improve the forming efficiency and quality of circular steel pipes, a feeding mechanism for steel pipe forming machine is designed. Utility Model Content

[0003] The purpose of this utility model is to provide a feeding mechanism for a steel pipe forming machine. It adopts progressive deformation and, in conjunction with the segmented operation of the multi-stage roll forming assembly, can gradually and progressively bend the steel strip into the required shape and pipe diameter. This design greatly improves the forming efficiency, mechanical properties and quality of steel pipes while ensuring high production efficiency and equipment reliability.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a feeding mechanism for a steel pipe forming machine, comprising: a base plate; a first roll forming assembly, a second roll forming assembly, and a third roll forming assembly sequentially mounted on the base plate along the running direction of the steel pipe, for shaping and feeding the steel pipe from sheet to tube shape; wherein, the diameters of the first roll forming assembly, the second roll forming assembly, and the third roll forming assembly decrease progressively along the running direction of the steel pipe, so as to achieve graded operation of the steel pipe deformation by means of gradual deformation.

[0005] Preferably, the first roll forming assembly includes an assembly base plate fixed on the substrate, with assembly side plates fixed on both sides of the assembly base plate; and a plurality of elliptical roll forming structures and a plurality of H-shaped roll forming mechanisms respectively disposed above and below the opposing surfaces of the two assembly base plates, wherein the plurality of elliptical roll forming structures and the plurality of H-shaped roll forming mechanisms correspond one-to-one, and the dimensions of the plurality of elliptical roll forming structures decrease progressively along the running direction of the steel pipe, while the dimensions of the plurality of H-shaped roll forming mechanisms increase progressively along the running direction of the steel pipe; each of the elliptical roll forming structures includes a first rotating shaft rotatably mounted on the upper part of the opposing surfaces of the two assembly side plates, with an elliptical roll fixed in the middle of the first rotating shaft.

[0006] Preferably, each of the H-shaped roller pressing mechanisms includes a second rotating shaft rotatably mounted on the lower part of the opposite surfaces of the two assembly side plates; and an H-shaped roller pressing member fixed to the second rotating shaft, wherein the H-shaped roller pressing member consists of side pressing rollers at both ends and a central shaft roller in the middle, and the central shaft roller is positioned directly below the elliptical roller.

[0007] Preferably, the second roll forming assembly includes a plurality of V-shaped roll seats mounted on the assembly base plate, wherein the included angle of the plurality of V-shaped roll seats gradually decreases along the running direction of the steel pipe, and each V-shaped roll seat includes two first support rods symmetrically fixed to the assembly base plate and distributed in a V-shape, and a first roll sleeve rotatably mounted to each of the first support rods; and spherical roll heads corresponding one-to-one with the plurality of V-shaped roll seats and having a trimmed diameter that gradually decreases along the running direction of the steel pipe, each spherical roll head including two vertical plates respectively fixed to both sides of the assembly base plate, and a third rotating shaft rotatably mounted to the opposite face of the two vertical plates; and also includes a ball roll fixed in the middle of the third rotating shaft, and the ball roll being built between the two first roll sleeves.

[0008] Preferably, the assembly base plate is further provided with several transfer rollers at the running end of several V-shaped roller seats; each transfer roller includes two second support rods symmetrically fixed on the assembly base plate and distributed in a figure-eight pattern, and a second roller sleeve disposed on the upper part of each second support rod, and several sets of second roller sleeves are used to receive the steel pipes transported out by the V-shaped roller seats.

[0009] Preferably, the third roll forming assembly includes several sets of three-point trimming rolls with trimming diameters decreasing progressively along the running direction of the steel pipe; each of the three-point trimming rolls includes a U-shaped base fixed to the surface of the substrate, a wedge-shaped slide plate inside the U-shaped base, and a bottom roll structure that is pulsatorically connected to the wedge-shaped slide plate; and side roll structures symmetrically arranged on the substrate and placed on both sides of the bottom roll base, and each side roll structure includes a mounting frame fixed to the substrate, an I-shaped frame fixed to one end of the mounting frame near the bottom roll structure; and two V-shaped plates rotatably mounted on the I-shaped frame via pins, wherein a first side roll body and a second side roll body are rotatably mounted on the opposite surfaces and lower ends of the two V-shaped plates via second pins, and the two second side roll bodies are in contact with both sides of the bottom roll structure, and a spring is also connected between the two second pins connecting the second side roll bodies.

[0010] Preferably, the bottom roller structure includes a trapezoidal block, a wedge surface formed at the bottom of the trapezoidal block, wherein the wedge surface is throttle-connected to the wedge-shaped sliding plate; a threaded sleeve disposed at the top of the trapezoidal block, a screw threadedly connected to the threaded sleeve; and a U-shaped frame fixed at the top of the screw; and a bottom roller body rotatably mounted inside the U-shaped frame, wherein the bottom roller body and the two first side roller bodies above it are triangularly distributed.

[0011] Preferably, a transmission plate assembly for finely adjusting the height of several bottom roller structures is also provided on one side of the substrate; the transmission plate assembly includes a mounting base fixed on one side of the substrate, an electric telescopic rod disposed on the mounting base, the telescopic end of the electric telescopic rod extending toward the third roll forming assembly and fixed with a transmission plate body; and several transmission grooves corresponding to several wedge-shaped slides opened on the transmission plate body; it also includes a transmission rod fixed on one side of each wedge-shaped slide, and a transmission column fixed at the bottom of the end of each transmission rod away from the wedge-shaped slide, the transmission column extending into the corresponding transmission groove and slidably installed therewith.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention achieves segmented operation by sequentially assembling a first roll forming assembly, a second roll forming assembly, and a third roll forming assembly on a base plate along the running direction of the steel pipe. Because the diameters of the first, second, and third roll forming assemblies decrease progressively along the running direction of the steel pipe, a gradual deformation method is used to shape the steel pipe from a sheet into a tube. This process not only ensures high forming precision and quality of the steel pipe and good production flexibility, but also minimizes wear and lifespan as each roll forming assembly only needs to undertake a small deformation task. The entire production line operates smoothly with low vibration and noise, and minimal impact on the motor and reducer. Furthermore, because the forming process is stable and reliable, the production line can operate faster, thereby improving production efficiency. Attached Figure Description

[0013] Figure 1 This is a first-view perspective three-dimensional structural diagram of the present invention; Figure 2 This is a second-view perspective three-dimensional structural diagram of the present invention; Figure 3 This is a top view of the structure of this utility model; Figure 4 This is a side view of the structure of this utility model; Figure 5 This is a front view structural diagram of the present utility model; Figure 6 This is an enlarged structural diagram of the bottom roller structure; Figure 7 This is a partial cross-sectional structural diagram of the third roll forming assembly.

[0014] In the diagram: 111, base plate; 211, assembly base plate; 212, assembly side plate; 213, second rotating shaft; 2141, side pressure roller; 2142, central shaft roller; 215, first rotating shaft; 216, elliptical roller; 217, second support rod; 218, second roller sleeve; 219, vertical plate; 220, third rotating shaft; 221, ball roller; 222, first support rod; 223, first roller sleeve; 311, U-shaped base; 312, wedge-shaped... 313. Slide plate; 314. Trapezoidal block; 315. Screw sleeve; 316. Screw; 317. Mounting base; 318. Mounting frame; 319. C-shaped frame; 320. V-shaped plate; 321. Second side roller body; 322. First side roller body; 323. Transmission rod; 324. Transmission column; 325. Assembly base; 326. Electric telescopic rod; 327. Transmission plate; 328. Transmission groove; 329. Spring. Detailed Implementation

[0015] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0016] Example 1

[0017] Please see Figures 1 to 7 The present invention preferably provides the following technical solution: a feeding mechanism for a steel pipe forming machine, comprising: a base plate 111; a first roll forming assembly, a second roll forming assembly, and a third roll forming assembly sequentially mounted on the base plate 111 along the running direction of the steel pipe, for shaping and feeding the steel pipe from sheet to tube shape; wherein, the diameters of the first roll forming assembly, the second roll forming assembly, and the third roll forming assembly decrease stepwise along the running direction of the steel pipe, so as to achieve graded operation of the steel pipe deformation by means of gradual deformation.

[0018] The feeding mechanism for the steel pipe forming machine provided in this application achieves the feeding effect during the steel pipe forming process. The forming process is further segmented by a first roll forming assembly, a second roll forming assembly, and a third roll forming assembly sequentially mounted on the base plate 111 along the steel pipe's running direction. Figure 1 , 2As shown in Figures 3 and 4, the trimming diameters of the first roll forming assembly, the second roll forming assembly, and the third roll forming assembly decrease progressively along the running direction of the steel pipe, that is, the steel pipe is transformed from a sheet into a tube by a gradual deformation method. Based on the basic principle of roll forming, a series of roll forming components with specific hole patterns can be used to gradually and progressively bend the steel strip into the required shape and diameter in dozens or even hundreds of passes, like "slow bending". Each stage of roll forming components is responsible for completing a part of the total bending amount. This design: First, possesses high molding precision and quality; The first forming process yields excellent roundness, and the gradual deformation allows the steel strip sufficient time to flow and release stress, resulting in a steel pipe with very high roundness and precise dimensions after final forming.

[0019] The second residual stress is minimized, reducing springback and making the steel pipe very "stable," making it less prone to deformation in subsequent processes (such as cutting and welding).

[0020] Thirdly, excellent surface quality: progressive micro-deformation and multi-stage operation can reduce scratches and indentations on the steel pipe surface, resulting in a high surface finish.

[0021] The fourth wall thickness is uniform. The diameters of the first, second, and third roll forming components decrease gradually along the running direction of the steel pipe to ensure that the wall thickness of the entire circumference of the steel pipe is uniform, thus ensuring the consistency of the product's mechanical properties.

[0022] The second outstanding production flexibility: By adjusting the parameters of the third roll forming assembly, the third roll forming assembly can produce steel pipes of different diameters or wall thicknesses within a certain range, reducing roll change time and costs. The third protection equipment and materials: Each stage of the forming roll assembly only needs to undertake a very small deformation task, so the wear is small, the service life is long, the whole production line runs smoothly, the vibration and noise are small, the impact on the motor and reducer is also small, and because the forming process is stable and reliable, the production line can run faster, thereby improving production efficiency.

[0023] Example 2

[0024] In another embodiment of the present invention, the first roll forming assembly includes an assembly base plate 211 fixed on a base plate 111, and assembly side plates 212 fixed on both sides of the assembly base plate 211; and a plurality of elliptical roll forming structures and a plurality of H-shaped roll forming mechanisms respectively disposed on the opposite surfaces of the two assembly base plates 211, wherein the plurality of elliptical roll forming structures and the plurality of H-shaped roll forming mechanisms correspond one-to-one, and the size of the plurality of elliptical roll forming structures decreases step by step along the running direction of the steel pipe, while the size of the plurality of H-shaped roll forming mechanisms increases step by step along the running direction of the steel pipe. Each elliptical roller pressing structure includes a first rotating shaft 215 rotatably mounted on the upper part of the opposite surfaces of the two mounting side plates 212, with an elliptical roller 216 fixed in the middle of the first rotating shaft 215; further, each H-shaped roller pressing mechanism includes a second rotating shaft 213 rotatably mounted on the lower part of the opposite surfaces of the two mounting side plates 212; and an H-shaped roller pressing member fixed to the second rotating shaft 213, wherein the H-shaped roller pressing member consists of side pressing rollers 2141 at both ends and a central shaft roller 2142 in the middle, and the central shaft roller 2142 is positioned directly below the elliptical roller 216.

[0025] In this embodiment, the mounting base plate 211 is fixed to the starting section of the base plate 111, such as... Figure 1 , 2 As shown, several elliptical roller pressing structures and several H-shaped roller pressing mechanisms are respectively arranged on the opposite surfaces of the two assembly side plates 212. The dimensions of the elliptical roller pressing structures decrease step by step along the running direction of the steel pipe, while the dimensions of the H-shaped roller pressing mechanisms increase step by step along the running direction of the steel pipe. Therefore, when the steel strip is inserted between the elliptical roller pressing structures and the H-shaped roller pressing mechanisms, the elliptical roller pressing structures and the H-shaped roller pressing mechanisms can pre-form the steel strip. Specifically, the elliptical roller 216 of each elliptical roller pressing structure and the central shaft roller 2142 of each H-shaped roller pressing mechanism are arranged opposite to each other and are clamped together on the front and back sides of the steel strip. When the steel strip is inserted between the elliptical roller 216 and the central shaft roller 2142 by external force and conveyed forward, the elliptical roller 216 and the central shaft roller 2142 squeeze the steel strip, so that the steel strip gradually bends into a set curvature to complete the pre-forming process.

[0026] Example 3

[0027] In another embodiment of this utility model, the second roll forming assembly includes a plurality of V-shaped roll seats mounted on the assembly base plate 211, wherein the included angle of the plurality of V-shaped roll seats gradually decreases along the running direction of the steel pipe, and each V-shaped roll seat includes two first support rods 222 symmetrically fixed to the assembly base plate 211 and distributed in a V-shape, and a first roll sleeve 223 rotatably mounted with each first support rod 222; and spherical roll heads corresponding one-to-one with the plurality of V-shaped roll seats and whose trimmed diameter gradually decreases along the running direction of the steel pipe, each spherical roll head including two vertical plates 219 respectively fixed on both sides of the assembly base plate 211, and a third rotating shaft 220 rotatably mounted opposite to the two vertical plates 219; and also includes a ball roll 221 fixed in the middle of the third rotating shaft 220, and the ball roll 221 is built between the two first roll sleeves 223.

[0028] like Figure 1 , 2 As shown in Figures 3 and 4, the V-shaped roller seats and spherical roller heads, which are distributed vertically and correspond one-to-one, are placed at the end of the first roll forming assembly and are used to receive the steel pipe after it has been pre-formed by the first roll forming assembly. Since the included angle of the V-shaped roller seat and the diameter of the spherical roller head both decrease gradually along the running direction of the steel pipe, the second-stage forming of the pre-formed steel pipe can be realized, and the curvature is further deepened to complete the progressive deformation operation.

[0029] Furthermore, the assembly base plate 211 is also equipped with several transfer rollers at the running ends of several V-shaped roller seats; each transfer roller includes two second support rods 217 symmetrically fixed on the assembly base plate 211 and arranged in a figure-eight pattern, and a second roller sleeve 218 disposed on the upper part of each second support rod 217, and several sets of second roller sleeves 218 are used to receive steel pipes transported out by the V-shaped roller seats, such as... Figure 1 , 2 As shown in Figures 3 and 4, this process is used to transfer the steel pipe output from the second roll forming assembly to the third roll forming assembly.

[0030] Example 4

[0031] In another embodiment of this utility model, the third roll forming assembly includes several sets of three-point trimming rolls with trimming diameters decreasing progressively along the running direction of the steel pipe; each three-point trimming roll includes a U-shaped base 311 fixed to the surface of the base plate 111, a wedge-shaped slide plate 312 provided inside the U-shaped base 311, a bottom roll structure drivingly connected to the wedge-shaped slide plate 312; and side roll structures symmetrically arranged on the base plate 111 and located on both sides of the bottom roll base, and each side roll structure includes a component fixed to the base plate 111. Mounting bracket 318, with a U-shaped frame 319 fixed at one end near the bottom roller structure; and two V-shaped plates 320 rotatably mounted on the U-shaped frame 319 via pins. The first side roller body 322 and the second side roller body 321 are respectively rotatably mounted on the opposite surfaces of the two V-shaped plates 320 via second pins. The two second side roller bodies 321 are in contact with both sides of the bottom roller structure. A spring 229 is also connected between the two second pins connecting the second side roller bodies 321.

[0032] This embodiment is referred to. Figure 1 , 2 As shown in Figures 3, 5, and 6, several sets of three-point trimming rollers are known to decrease gradually along the running direction of the steel pipe to achieve progressive deformation operation. The bottom roller structure and the two side roller structures of each three-point trimming roller are triangularly distributed and adaptively clamp the steel pipe. When the steel pipe moves between the bottom roller structure and the two side roller structures that form a triangular shape, the progressive fine trimming of the steel pipe is further realized as the steel pipe is fed forward.

[0033] Example 5

[0034] As another embodiment of the present invention, the bottom roller structure includes a trapezoidal block 313, a wedge surface formed at the bottom of the trapezoidal block 313, wherein the wedge surface is connected to the wedge-shaped slide plate 312 in a transmission manner; a screw sleeve 314 disposed at the top of the trapezoidal block 313, a screw rod 315 threadedly connected to the screw sleeve 314; and a U-shaped frame 316 fixed at the top of the screw rod 315; and a bottom roller body 317 rotatably installed inside the U-shaped frame 316, wherein the bottom roller body 317 and the two first side roller bodies 322 above it are triangularly distributed.

[0035] like Figure 5 , 6 As shown, the bottom roller body 317 inside the U-shaped frame 316 can directly contact the steel pipe, and the screw 315 fixed at the bottom of the U-shaped frame 316 can be threadedly connected to the screw sleeve 314 provided on the surface of the trapezoidal block 313. This design can not only pre-adjust the height of the bottom roller body 317 to meet the coarse adjustment of the inner diameter of the steel pipe clamping, but also adjust the angle of contact between the bottom roller body 317 and the steel pipe to achieve the adjustment of the trimming diameter and improve the applicability of the device. Because the two second side roller bodies 321 are in contact with the two sides of the trapezoidal block 313, and with the help of the spring 229, when the steel pipe enters between the bottom roller body 317 and the two first side roller bodies 322, the two first side roller bodies 322 expand outward, and the two sets of V-shaped plates 320 deflect adaptively, so that the two second side roller bodies 321 adaptively abut against the two sides of the trapezoidal block 313. As the steel pipe moves forward, the two first side roller bodies 322 retract and reset under the action of the spring 229.

[0036] Example 6

[0037] As another embodiment of this utility model, a transmission plate assembly for finely adjusting the height of several bottom roller structures is also provided on one side of the substrate 111; the transmission plate assembly includes a mounting base 325 fixed on one side of the substrate 111, an electric telescopic rod 326 provided on the mounting base 325, the telescopic end of the electric telescopic rod 326 extending toward the direction of the third roll forming assembly and fixed with a transmission plate body 327; and several transmission grooves 328 corresponding to several wedge-shaped slide plates 312 opened on the transmission plate body 327; it also includes a transmission rod 323 fixed on one side of each wedge-shaped slide plate 312, and a transmission column 324 fixed at the bottom of the end of each transmission rod 323 away from the wedge-shaped slide plate 312, the transmission column 324 extending into the corresponding transmission groove 328 and slidably installed therewith.

[0038] like Figure 1 , 2 As shown in Figures 3 and 7, and as mentioned above, the wedge-shaped surface at the bottom of the trapezoidal block 313 makes transmission contact with the wedge-shaped sliding plate 312. The transmission grooves 328 on the transmission plate 327 correspond one-to-one with the wedge-shaped sliding plates 312. The transmission rod 323 fixed at the end of each wedge-shaped sliding plate 312 can slide within its corresponding transmission groove 328 via the transmission column 324 at its end. Therefore, when the transmission plate 327 moves back and forth powered by the electric telescopic rod 326, the wedge-shaped sliding plates 312 can move as follows: Figure 1 The state moves up and down, thereby realizing the upward extrusion and downward reset process of 312 on 313, so as to achieve fine adjustment of the height of several bottom roller bodies 317, and further realize the adjustment of the inner diameter of the triangular bottom roller body 317 and the two first side roller bodies 322 to meet the different forming requirements of steel pipe.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection", "fixation" and other terms should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral part. There are various ways to install detachably, such as by using a plug-in and snap-fit ​​method, or by using a bolt connection, etc.

[0040] The above description of the specific embodiments of this utility model is only used to further illustrate this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-essential improvements and adjustments made to this utility model by technical engineers based on the above description of the utility model shall fall within the scope of protection of this utility model.

Claims

1. A feeding mechanism for a steel pipe forming machine, characterized in that... ,include: substrate(111); The first roll forming assembly, the second roll forming assembly and the third roll forming assembly are sequentially assembled on the base plate (111) along the running direction of the steel pipe, and are used for shaping and feeding the steel pipe from sheet to tube. The first, second, and third roll forming components have their trimmed diameters decreasing progressively along the direction of the steel pipe's movement, thus achieving graded deformation of the steel pipe through a gradual deformation method.

2. The feeding mechanism for a steel pipe forming machine according to claim 1, characterized in that: The first roll forming assembly includes an assembly base plate (211) fixed on the base plate (111), and assembly side plates (212) are fixed on both sides of the assembly base plate (211). And a number of elliptical roller pressing structures and a number of H-shaped roller pressing mechanisms respectively set on the opposite surfaces of the two assembly base plates (211), wherein the number of elliptical roller pressing structures and the number of H-shaped roller pressing mechanisms correspond one to one, and the size of the number of elliptical roller pressing structures decreases step by step along the running direction of the steel pipe, and the size of the number of H-shaped roller pressing mechanisms increases step by step along the running direction of the steel pipe. Each of the elliptical roll forming structures includes a first rotating shaft (215) rotatably mounted on the upper part of the opposite surfaces of the two assembly side plates (212), with an elliptical roller (216) fixed in the middle of the first rotating shaft (215).

3. The feeding mechanism for a steel pipe forming machine according to claim 2, characterized in that: Each of the H-shaped roller pressing mechanisms includes a second rotating shaft (213) rotatably mounted on the lower part of the opposite surfaces of the two assembly side plates (212); And an H-shaped roller pressing member fixed to the second rotating shaft (213), wherein the H-shaped roller pressing member consists of side rollers (2141) at both ends and a central shaft roller (2142) in the middle, and the central shaft roller (2142) is positioned directly below the elliptical roller (216).

4. The feeding mechanism for a steel pipe forming machine according to claim 2, characterized in that: The second roll forming assembly includes a plurality of V-shaped roll seats mounted on the assembly base plate (211), wherein the V-shaped included angle of the plurality of V-shaped roll seats gradually decreases along the running direction of the steel pipe, and each V-shaped roll seat includes two first support rods (222) symmetrically fixed to the assembly base plate (211) and distributed in a V-shape, and a first roll sleeve (223) rotatably mounted with each of the first support rods (222). And a spherical roller head corresponding to a number of V-shaped roller seats and whose trimming diameter decreases step by step along the running direction of the steel pipe. Each spherical roller head includes two vertical plates (219) fixed on both sides of the mounting base plate (211) and a third rotating shaft (220) rotatably mounted on the opposite side of the two vertical plates (219). It also includes a ball roller (221) that fixes the middle of the third rotating shaft (220), and the ball roller (221) is built between two first roller sleeves (223).

5. The feeding mechanism for a steel pipe forming machine according to claim 4, characterized in that: The assembly base plate (211) is also provided with several transfer rollers at the running end of several V-shaped roller seats; Each transfer roller includes two second support rods (217) symmetrically fixed on the mounting base plate (211) and arranged in a figure-eight pattern, and a second roller sleeve (218) disposed on the upper part of each second support rod (217), and several sets of second roller sleeves (218) are used to receive steel pipes transported out by the V-shaped roller seat.

6. The feeding mechanism for a steel pipe forming machine according to claim 1, characterized in that: The third roll forming assembly includes several sets of three-point trimming rolls with trimming diameters decreasing progressively along the running direction of the steel pipe. Each of the three-point trimming rollers includes a U-shaped base (311) fixed to the surface of the substrate (111), and a wedge-shaped slide plate (312) is provided inside the U-shaped base (311), and a bottom roller structure is drivenly connected to the wedge-shaped slide plate (312). And side roller structures symmetrically arranged on the substrate (111) and placed on both sides of the bottom roller seat, and each side roller structure includes a mounting bracket (318) fixed on the substrate (111), and a U-shaped frame (319) is fixed to one end of the mounting bracket (318) near the bottom roller structure. And two V-shaped plates (320) are rotatably mounted on the C-shaped frame (319) via pins. The first side roller body (322) and the second side roller body (321) are rotatably mounted on the opposite surfaces of the two V-shaped plates (320) via second pins, and the two second side roller bodies (321) are in contact with the two sides of the bottom roller structure. A spring (229) is also connected between the two second pins connecting the second side roller bodies (321).

7. The feeding mechanism for a steel pipe forming machine according to claim 6, characterized in that: The bottom roller structure includes a trapezoidal block (313) and a wedge surface formed at the bottom of the trapezoidal block (313), wherein the wedge surface is connected to the wedge-shaped sliding plate (312) in a transmission manner; A threaded sleeve (314) is provided on the top of the trapezoidal block (313), and a screw rod (315) is threadedly connected to the threaded sleeve (314). And a U-shaped frame (316) fixed to the top of the screw (315); It also includes a bottom roller body (317) that is rotatably installed inside the U-shaped frame (316), and the bottom roller body (317) and the two first side roller bodies (322) above it are triangularly distributed.

8. The feeding mechanism for a steel pipe forming machine according to claim 6, characterized in that: A transmission plate assembly for finely adjusting the height of several bottom roller structures is also provided on one side of the substrate (111). The transmission plate assembly includes a mounting base (325) fixed on one side of the base plate (111), an electric telescopic rod (326) disposed on the mounting base (325), and the telescopic end of the electric telescopic rod (326) extends toward the third roll forming assembly and is fixed with a transmission plate body (327). And a number of transmission grooves (328) corresponding to a number of wedge-shaped sliding plates (312) are opened on the transmission plate (327); It also includes a transmission rod (323) fixed to one side of each wedge-shaped slide plate (312), and a transmission column (324) is fixed at the bottom of the end of each transmission rod (323) away from the wedge-shaped slide plate (312), the transmission column (324) extending into the corresponding transmission groove (328) and slidably installed therewith.

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