Seamless steel tube bending forming equipment

Abstract

The invention relates to the technical field of expanding equipment, in particular to seamless steel pipe bending forming equipment which comprises a base used for supporting the whole equipment, a rotatable stand column is assembled on the surface of the base, and a bending die for determining the bending radius of a steel pipe is assembled on the surface of the stand column. A clamping die matched with a bending die to clamp a steel pipe to rotate is assembled on the surface of the base, a guide die matched with the bending die is assembled on the surface of the base, a core rod used for being inserted into the steel pipe to prevent bending collapse is assembled above the base, and the core rod comprises a plurality of core bodies assembled along the axis and rod bodies assembled on the surfaces of the core bodies at the ends. The multiple core bodies are installed and connected through the elastic pieces. The bent steel pipe is internally and externally supported by assembling the side pressing dies on the outer sides and the inner core rods, the situation that the thin steel pipe is sunken or out of round in the bending process is prevented, meanwhile, the side pressing dies make contact with the bent position for a long time in the clamping process, and therefore the bent steel pipe can be better subjected to pressure maintaining.

Description

Technical Field

[0001] The invention relates to the technical field of bending machines, and particularly provides a seamless steel pipe bending and forming device. Background Art

[0002] The main purpose of bending seamless steel pipes is to meet the functional, structural and economic requirements in engineering, manufacturing and design, to adapt to spatial layout and installation requirements, and to optimize fluid or gas transmission performance. Usually, a CNC pipe bender is selected to bend the steel pipe. The steel pipe is fixed by a clamping die, and the bending die rotates and pulls the steel pipe into shape. The thicker the wall of the steel pipe, the stronger its resistance to inward collapse and out-of-roundness. However, steel pipes with thinner walls will have a greater risk of inward collapse and out-of-roundness during the bending process.

[0003] In order to ensure the quality of thinner steel pipes during the bending process, a core rod is usually inserted into the inside of the steel pipe to support the inner wall of the steel pipe. The core rod needs to be gradually pulled out during the bending process. Although this can prevent the steel pipe from losing its roundness and sinking in during the bending process, since it can only support from the inside of the steel pipe, its anti-loosening and sinking effect is relatively poor, and the core rod can only support part of the bending area during the bending process, so it is difficult to ensure a good anti-sinking effect. After the steel pipe is bent, it has its own elasticity, so there will be a rebound problem. In particular, after the core rod is pulled out, the inner side of the steel pipe loses support, and the part that was originally "forced" to form by the core rod will rebound due to elastic recovery, further affecting the quality of the bending forming.

[0004] Therefore, there is an urgent need for a seamless steel pipe bending and forming equipment that can simultaneously support and limit the steel pipe from the inside and outside, improve the steel pipe's ability to resist loss of roundness and inward collapse, and maintain pressure on the bent steel pipe. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a seamless steel pipe bending and forming equipment for solving the problems mentioned in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a seamless steel pipe bending forming equipment, including a base for supporting the entire equipment, a rotatable column is installed on the surface of the base, a bending die that determines the bending radius of the steel pipe is installed on the surface of the column, a clamping die that cooperates with the bending die to clamp the steel pipe for rotation is installed on the surface of the base, a guide die that cooperates with the bending die is installed on the surface of the base, and a core rod for inserting into the steel pipe to prevent bending and collapse is installed above the base, and the core rod includes a plurality of core bodies assembled along the axis and a rod assembled on the surface of the core body at the end. The core rod is provided with a body, and multiple core bodies are installed and connected by elastic parts. The center line of the multiple core bodies under the action of the elastic parts is an arc shape that can provide pressure maintenance for the bending of the steel pipe. The surface of the core rod is equipped with a limiting component for changing the arc of the center line into a straight line and facilitating the insertion of the bent steel pipe; the upper part of the column is equipped with multiple side pressure molds for preventing loss of roundness and maintaining pressure. The multiple side pressure molds can revolve with the column. The upper part of the main shaft is equipped with a rotating component that can drive the side pressure mold to rotate away from / close to the bending mold. The inner diameter curvature of the side pressure mold is the same as the bending curvature required for the steel pipe.

[0007] Preferably, the diameter of the core body is smaller than the inner diameter of the bent steel pipe, and balls for pressing against the inner wall of the steel pipe are equidistantly provided around the core body. V-shaped spring pieces are installed between adjacent core bodies, and the two ends of the spring pieces are respectively fixed inside the adjacent core bodies, with the V-shaped ends of the spring pieces facing the same side.

[0008] Preferably, grooves are formed on both sides of the core body, the inner wall of the groove is rectangular, the top of the spring piece abuts against the top of the inner wall of the groove, and the bottom of the spring piece abuts against the bottom of the inner wall of the groove.

[0009] Preferably, the limiting assembly includes a through groove opened on the surface of the core along the axial direction of the core, and a limiting rod is slidably assembled inside the through groove, and the limiting rod simultaneously passes through each through groove on the surface of the core.

[0010] Preferably, the total length of the line connecting the centers of all core bodies in a straight line state is greater than the bending length of the steel pipe.

[0011] Preferably, the rotating assembly includes a mounting frame mounted on the surface of the column, the surface of the mounting frame is rotatably mounted with a connecting frame mounted on the side pressure mold, the surface of the connecting frame is hingedly mounted with a retractable rotating rod, the end of the rotating rod is mounted with a sleeve, the top of the column is mounted with a bracket, the surface of the bracket is rotatably mounted with a plurality of threaded rods, the sleeve is threadedly mounted on the surface of the threaded rod, and the interior of the bracket is mounted with a driving assembly for rotating each threaded rod.

[0012] Preferably, the driving assembly includes a gear 1 mounted on the surface of the threaded rod, a hanger is mounted on the surface of the base, a motor is mounted at the lower end of the hanger, a fan gear is mounted on the surface of the output shaft of the motor, and the fan gears are respectively engaged with gear 1 on the side die in sequence.

[0013] Preferably, the guide mold is a semicircular mold capable of self-rotation.

[0014] Preferably, the surface of the base is equipped with a movable seat that can move along the axial direction of the steel pipe when it is not bent, the surface of the movable seat is equipped with a positioning shaft that can be raised and lowered, the positioning shaft moves through the surface of the rod body, and the surface of the movable seat is equipped with a V-shaped seat for providing support force for the steel pipe and core rod.

[0015] Preferably, a support rod is mounted on the surface of the hanger, and the support rod is rotatably mounted on the surface of the bracket, and the axis of the support rod coincides with the axis of the column.

[0016] 1. The above technical solution has the following advantages or beneficial effects: The present invention provides a seamless steel pipe bending and forming equipment, which provides internal and external dual support for the bent steel pipe by assembling multiple outer side pressure dies and internal core rods, thereby preventing the thinner steel pipe from sinking or losing its roundness during the bending process. At the same time, the side pressure die is in contact with the bent position for a long time during the clamping process, thereby better maintaining the pressure of the bent steel pipe.

[0017] 2. The above technical solution has the following advantages or beneficial effects: The present invention provides a seamless steel pipe bending and forming equipment. By setting multiple core bodies and V-shaped spring sheets, when the core body is located inside the steel pipe, it is squeezed into an arc state by the spring sheet. The arc state at this time is consistent with the arc state during bending. The elasticity of the spring sheet can be used to maintain pressure on the bending position to achieve a better pressure maintaining effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention and its features, configurations and advantages will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings, in which like reference numerals indicate like parts throughout the drawings, which are not drawn to scale, with emphasis placed on illustrating the subject matter of the present invention.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a seamless steel pipe bending and forming equipment provided by the present invention in an unbent state.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of a seamless steel pipe bending and forming equipment provided by the present invention in a bending state.

[0021] Figure 3 It is a front cross-sectional view of the core rod inside the unbent steel pipe.

[0022] Figure 4 This is a cross-sectional view of the core rod inside the bent steel pipe

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the core rod.

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of adjacent cores.

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the side pressure die in the bent state.

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the side pressure die in the unbent state.

[0027] Figure 9 It is a schematic diagram of the three-dimensional structure of the rotating component.

[0028] Figure 10 It is a structural diagram of the meshing state of gear 1 and sector gear.

[0029] In the figure: 1. Base; 2. Column; 3. Bending die; 4. Clamping die; 5. Mandrel; 51. Core body; 52. Rod body; 6. Limiting assembly; 61. Through slot; 62. Limiting rod; 7. Rotating assembly; 71. Connecting frame; 72. Rotating rod; 73. Sleeve; 74. Bracket; 75. Threaded rod; 76. Driving assembly; 761. Gear 1; 762. Hanger; 763. Motor; 764. Fan gear; 77. Mounting frame; 8. Side pressure die; 9. Ball; 10. Shrapnel; 11. Groove; 12. Support rod; 13. Positioning shaft; 14. Moving seat; 15. V-shaped seat; 16. Guide die. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Figure 1 and Figure 2 Disclosed is a seamless steel pipe bending and forming device. Figure 1 This is the unbent state of the seamless steel pipe bending forming equipment. Figure 2 This is the bending state of the seamless steel pipe bending forming equipment.

[0033] like Figure 1-Figure 2As shown, the seamless steel pipe bending forming equipment includes a base 1 for supporting the entire equipment, a column 2 is rotatably installed on the surface of the base 1, and a bending die 3 is fixedly installed on the surface of the column 2 by bolts or other installation methods. The curvature of the bending die 3 determines the bending radius of the steel pipe. Since a large power is required when bending the steel pipe, the drive of the column 2 is selected to be driven by a hydraulic motor to drive its rotation. The surface of the base 1 is slidably equipped with a clamping die 4, which is attached to the straight section of the bending die 3. The two clamp the end of the steel pipe. The surface of the base 1 is also slidably equipped with a guide die 1 6. The guide die 16 cooperates with the bending die 3 to guide the steel pipe, and the clamping die 4 can rotate with the rotation of the column 2. In this embodiment, the bending angle of the steel pipe is 90°, and the guide die 16 is semicircular. The guide die 16 rotates during the movement of the steel pipe to ensure the guidance of the steel pipe and reduce the wear on the surface of the steel pipe. The semicircular guide die 16 can create a larger space in the bending part of the steel pipe when bending. The side pressure die 8 is assembled in the space to support the outer side of the bent steel pipe and maintain pressure, thereby ensuring the quality of the steel pipe bending.

[0034] The core rod 5 is inserted into the interior of the steel pipe to support the interior of the steel pipe. When used in conjunction with the side pressure die 8, it can more effectively prevent the steel pipe from being bent inward and out of round, and further ensure the quality of the steel pipe bending.

[0035] like Figure 1-Figure 2 and Figure 7-10 As shown, in this embodiment, the number of side pressing dies 8 is set to seven, and the surface of the side pressing die 8 and the bending die 3 are both provided with semicircular grooves adapted to the diameter of the steel pipe. When the side pressing die 8 is fitted with the bending die 3, the two semicircular grooves form a circular groove with a diameter slightly smaller than the diameter of the steel pipe to ensure the stability of the steel pipe clamping. The state of the side pressing die 8 before bending is as shown in FIG. Figure 1 As shown, a rotating assembly 7 is assembled above the column 2. The rotating assembly 7 can drive the side pressure die 8 to rotate, and the side pressure die 8 is used to limit the bent part of the steel pipe. When the bending area gradually increases, the side pressure die 8 rotates in sequence and gradually covers the surface of the steel pipe. During the whole process, the side pressure die 8 continues to clamp and maintain pressure, and limits the steel pipe, thereby ensuring the steel pipe's anti-de-roundness ability during the bending process.

[0036] The rotating assembly 7 includes a mounting frame 77 fixedly mounted on the surface of the column 2, and seven connecting frames 71 are rotatably mounted on the mounting frame 77. The connecting frames 71 rotate around the mounting frame 77. It should be noted that the side pressure mold 8 does not collide with the edge of the bending mold 3 when rotating. The height of the connecting frame 71 and the axis of rotation around the mounting frame 77 are obtained by technical personnel in this field after multiple experiments. The surface of the connecting frame 71 is hingedly equipped with a retractable rotating rod 72. In this embodiment, the rotating rod 72 is a rectangular rod, and the inner rod end of the rotating rod 72 is integrally formed with a sleeve 73. The top of the column 2 is fixedly equipped with a bracket 74. The surface of the bracket 74 is equipped with a threaded rod 75 through a bearing. The threaded rod 75 can rotate on the surface of the bracket 74. The interior of the bracket 74 is equipped with a drive assembly 76, which can rotate each threaded rod 75 separately.

[0037] The driving assembly 76 includes a gear 761 fixedly mounted on the surface of the threaded rod 75 by a spline, a hanger 762 fixedly mounted on the surface of the base 1, the lower end of the hanger 762 is fixedly assembled with a motor 763 through a motor seat, and the output shaft surface of the motor 763 is fixedly assembled with a fan gear 764 through a spline, and the fan gear 764 is respectively engaged with the gear 761 on the seven side pressure dies 8 in sequence. To ensure the stability of the hanger 762, a support rod 12 is welded on the lower surface of the hanger 762, and the support rod 12 is rotatably mounted on the surface of the bracket 74 and coincides with the axis of the column 2.

[0038] by Figure 8 is the initial state, Figure 7 This is the final state after the drive assembly 76 is driven. It should be noted that the diameter, tooth spacing, and size of the sector gear 764 are exactly the same as those of the gear 1 761. When the column 2 drives the mounting bracket 77 to rotate, the threaded rod 75 at the first position has not yet reached the position of the sector gear 764. Under the drive of the motor 763, the outermost teeth of the sector gear 764 can just begin to mesh with the teeth of the gear 1 761. The position of the first tooth of the sector gear 764 is obtained by those skilled in the art through multiple experiments. Due to the slow bending speed of the steel pipe, the sector gear 764 and the teeth are The meshing speed of wheel 761 is also slow, and there is no risk of tooth collision. When gear 761 rotates and meshes with sector gear 764, it will drive the threaded rod 75 to rotate, and the sleeve 73 will be able to slide upward along the surface of the threaded rod 75. The rotating rod 72 will shrink, and the connecting frame 71 will rotate around the mounting frame 77, driving the side pressure mold 8 to rotate until the side pressure mold 8 fits the surface of the bending mold 3, and the steel pipe of the bent part is pressure-limited. The gears 761 connected to the seven side pressure molds 8 are meshed with sector gears 764 in turn, thereby realizing the closed pressure-limiting in turn. When opening, the column 2 can be reversed.

[0039] like Figures 1-6As shown, a core rod 5 for inserting into the steel pipe to prevent it from sinking is assembled above the base 1. The core rod 5 includes a plurality of core bodies 51. The diameter of the core body 51 is smaller than the inner diameter of the steel pipe. The core body 51 has a plurality of equally spaced balls 9 arranged in the axial direction. The balls 9 are against the inner wall of the steel pipe. Grooves 11 are provided on both sides of the core body 51. The inner wall shape of the groove 11 is rectangular. A V-shaped spring piece 10 is welded between two adjacent core bodies 51. The two ends of the spring piece 10 are located inside the groove 11. The top of the spring piece 10 is against the groove 11. 1, and the bottom of the spring piece 10 is against the bottom of the inner wall of the groove 11. At this time, the line connecting the centers of all the core bodies 51 is an arc in the initial state. At the same time, the spring piece 10 has a certain thickness and can provide a certain support force for the core body 51. In order to facilitate the insertion of the core body 51 into the interior of the steel pipe, the end of the core body 51 closest to the steel pipe insertion port is fixedly welded with a rod body 52 and a limit assembly 6 to ensure that the line connecting the centers of all the core bodies 51 is a straight line. At this time, it can play a supporting role when inserted into the interior of the steel pipe.

[0040] The limiting assembly 6 includes a through groove 61 opened on the surface of the core body 51, and a limiting rod 62 is slidably assembled inside the through groove 61. The end of the limiting rod 62 moves through all the through grooves 61 on the core body 51 in turn. At this time, the core rod 5 can be completely placed inside the steel pipe, providing internal support for the steel pipe during the bending process of the steel pipe. At the same time, the limiting rod 62 is gradually pulled out during the bending process, and the elastic force of the spring 10 will squeeze the two adjacent core bodies 51 into a V shape until the limiting rod 62 is completely retreated to the straight pipe position of the steel pipe. At this time, the elastic force of the core body 51 and the spring 10 can elastically maintain pressure on the bending position, and at the same time serve as internal support to prevent inward collapse. The total length of the line connecting the centers of the core body 51 in a straight line state is greater than the bending length of the steel pipe, providing support force and elastic pressure maintenance for the entire bending stage.

[0041] The surface of the base 1 is slidably equipped with a movable seat 14 that can move along the axial direction of the steel pipe when it is not bent. The surface of the movable seat 14 is equipped with a positioning shaft 13 that can be raised and lowered. The positioning shaft 13 movably passes through the surface of the rod body 52. ​​The positioning shaft 13 positions one end of the core rod 5. The surface of the movable seat 14 is fixedly equipped with a V-shaped seat 15 for providing support force for the steel pipe and the core rod 5.

[0042] The present invention provides a seamless steel pipe bending and forming equipment. In the initial state, the core rod 5 is overlapped on the surface of the V-shaped seat 15, and the steel pipe is placed inside the bending die 3. Then the guide die 16 and the clamping die 4 move at the same time to clamp the steel pipe. Then the core rod 5 is placed inside the steel pipe, the clamping die 4 and the bending die 3 rotate at the same time, and the guide die 16 rotates on its own. At this time, for the position of the side pressure die 8, when the gear 1 761 rotates and engages with the fan gear 764, it will drive the threaded rod 75 to rotate, and the sleeve 73 will be able to slide upward along the surface of the threaded rod 75. The rotating rod 72 will shrink, and the connecting frame 71 will rotate around the mounting frame 77, driving the side pressure die 8 to rotate until the side pressure die 8 fits the surface of the bending die 3, and the steel pipe of the bent part is pressure-maintained and limited. For the core rod 5, the limiting rod 62 is gradually pulled out during the bending process. , the elastic force of the spring piece 10 will squeeze the two adjacent core bodies 51 into a V shape until the limit rod 62 is completely withdrawn to the straight tube position of the steel pipe. At this time, the elastic force of the core body 51 and the spring piece 10 can elastically maintain pressure on the bending position, and at the same time serve as internal support to prevent inward collapse. The total length of the line connecting the centers of the core body 51 in a straight state is greater than the bending length of the steel pipe, providing support force and elastic pressure maintenance for the entire bending stage. After the bending is completed, the guide die 16 and the clamping die 4 withdraw, and the moving seat 14 pulls the rod body 52 to drive the core body 51 into the straight section of the steel pipe. The core body 51 is automatically straightened, and the staff holds the limit rod 62 and reinserts it into the interior of the through slot 61. The bending die 3 rotates back to the initial state with the column 2, and the side pressure die 8 also returns to the initial state. At this time, the bent steel pipe can be taken out, and it is convenient for the next bending and pressure maintenance.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A seamless steel pipe bending and forming device, comprising a base for supporting the entire device, a rotatable column mounted on the surface of the base, a bending die mounted on the surface of the column for determining the bending radius of the steel pipe, a clamping die mounted on the surface of the base for cooperating with the bending die to clamp the steel pipe for rotation, and a guide die mounted on the surface of the base, characterized in that: A core rod for inserting into the steel pipe to prevent bending and collapse is installed above the base. The core rod includes a plurality of core bodies assembled along the axis and a rod body assembled on the surface of the core body at the end. The plurality of core bodies are installed and connected by elastic members. The center line of the plurality of core bodies under the action of the elastic member is an arc shape that can provide pressure maintenance for bending the steel pipe. The surface of the core rod is equipped with a limiting component for changing the arc line connecting the center lines into a straight line and facilitating insertion into the bent steel pipe. A plurality of side pressure dies for preventing loss of roundness and maintaining pressure are installed above the column. The plurality of side pressure dies can revolve along with the column. A rotating assembly capable of driving the side pressure dies to rotate away from / closer to the bending die is installed above the column. The inner diameter curvature of the side pressure dies is the same as the bending curvature required for the steel pipe.

2. The seamless steel pipe bending and forming equipment according to claim 1, characterized in that: The diameter of the core body is smaller than the inner diameter of the bent steel pipe. Balls for pressing against the inner wall of the steel pipe are equidistantly provided around the core body. V-shaped spring pieces are installed between adjacent core bodies. The two ends of the spring pieces are respectively fixed inside adjacent core bodies, and the V-shaped ends of the spring pieces are both facing the same side.

3. The seamless steel pipe bending and forming equipment according to claim 2, characterized in that: Grooves are provided on both sides of the core body, and the inner wall of the groove is rectangular. The top of the spring piece abuts against the top of the inner wall of the groove, and the bottom of the spring piece abuts against the bottom of the inner wall of the groove.

4. The seamless steel pipe bending and forming equipment according to claim 1, characterized in that: The limiting assembly includes a through slot opened on the surface of the core along the axial direction of the core, and a limiting rod is slidably assembled inside the through slot, and the limiting rod simultaneously passes through each through slot on the surface of the core.

5. The seamless steel pipe bending and forming equipment according to claim 1, characterized in that: The total length of the straight line connecting the centers of all cores is greater than the bending length of the steel pipe.

6. The seamless steel pipe bending and forming equipment according to claim 1, characterized in that: The rotating assembly includes a mounting bracket mounted on the surface of the column, the surface of the mounting bracket is rotatably mounted with a connecting bracket mounted on the side pressure mold, the surface of the connecting bracket is hingedly mounted with a retractable rotating rod, the end of the rotating rod is mounted with a sleeve, the top of the column is mounted with a bracket, the surface of the bracket is rotatably mounted with a plurality of threaded rods, the sleeve is threadedly mounted on the surface of the threaded rod, and the interior of the bracket is mounted with a driving assembly for rotating each threaded rod.

7. The seamless steel pipe bending and forming equipment according to claim 6, characterized in that: The driving assembly includes a gear 1 mounted on the surface of the threaded rod, a hanger mounted on the surface of the base, a motor mounted at the lower end of the hanger, a fan-shaped gear mounted on the surface of the output shaft of the motor, and the fan-shaped gears respectively mesh with the gear 1 on the side die in sequence.

8. The seamless steel pipe bending and forming equipment according to claim 1, characterized in that: The guide die is a semicircular die capable of self-rotation.

9. The seamless steel pipe bending and forming equipment according to claim 5, characterized in that: The surface of the base is equipped with a movable seat that can move along the axial direction of the steel pipe when it is not bent. The surface of the movable seat is equipped with a positioning shaft that can be raised and lowered. The positioning shaft moves through the surface of the rod body. The surface of the movable seat is equipped with a V-shaped seat for providing support force for the steel pipe and the core rod.

10. The seamless steel pipe bending and forming equipment according to claim 7, characterized in that: The surface of the hanger is equipped with a support rod, and the support rod is rotatably assembled on the surface of the bracket, and the axis of the support rod coincides with the axis of the column.

Images