Angular positioning method and mechanism for opening holes in front of pipe bending

Abstract

The invention relates to an angular positioning method and mechanism for opening a hole before pipe bending, and the angular positioning mechanism for opening the hole before pipe bending comprises a supporting assembly used for supporting a pipe fitting; the lifting assembly is used for driving the elastic positioning assembly to move up and down; a positioning pin is arranged at the lower end of the elastic positioning assembly and used for being elastically pressed on the surface of the pipe fitting; the lower part of the pipe fitting can extend into an opening in the pipe fitting in the rotating process of the pipe fitting; the first proximity switch is used for detecting the motion state of the elastic positioning assembly; when the positioning pin is elastically pressed on the surface of the pipe fitting, the first proximity switch triggers the lifting cylinder to stop; the ejector pin assembly is provided with an ejector pin inserted into the upper part of the positioning pin and can press the ejector pin into the lower part of the positioning pin; the second proximity switch is used for detecting the motion state of the ejector pin assembly; the ejector pin is pressed downwards and triggers the second proximity switch, the ejector pin is pressed into the lower portion of the positioning pin, and the hole opening position in the pipe fitting is accurately positioned. According to the scheme, the working efficiency and the product quality can be improved through two-time positioning of the positioning pin and the ejector pin.

Description

Technical Field

[0001] This invention relates to the field of aerospace pipe bending machine technology, and in particular to a method and mechanism for angular positioning of pre-bending holes in pipes. Background Technology

[0002] Many metal conduits are designed into equipment such as airplanes, rockets, and spacecraft to transport various fluids and support the various missions of the equipment during flight. They are extremely important components.

[0003] These metal conduits need to be bent into various shapes to fit pipe connections. For example, a Chinese invention patent with publication number CN113617955B discloses a pipe bending device and its automatic feeding and transferring device, including a mounting base slidably mounted on a frame, and an inner sleeve, an outer sleeve, a clamping assembly, a first driving assembly for driving the mounting base to move back and forth on the frame, a second driving assembly for driving the outer sleeve to move back and forth, and a third driving assembly for driving the inner sleeve to rotate. The outer sleeve is loosely fitted onto the inner sleeve. A first electrode and a second electrode are also provided, which are spaced apart on the clamping assembly. When the second driving assembly drives the outer sleeve to move forward, causing the clamping assembly to clamp the conduit, the first electrode and the second electrode are electrically connected through the conduit, thereby enabling the controller of the pipe bending device to obtain a feedback signal of clamping the conduit. In the above scheme, the automatic feeding and transferring device can clamp the pipe and move it forward and rotate the pipe to perform pipe bending. When bending the pipe, it bends at various angles according to the opening position on the pipe as required. Therefore, it is necessary to accurately locate the position of the opening on the pipe before bending so that the subsequent bending angle can be matched with the opening position.

[0004] Orifice angular positioning refers to the precise determination of the angular position of a hole (or a group of holes) in the circumferential direction during machining to ensure that the machining operation meets design requirements. In the aerospace field, orifice angular positioning on aerospace tubing is not an ordinary step, but a core technical link directly related to the safe and reliable operation of spacecraft. It ensures the precise flow of media such as fuel and oxidizer; prevents assembly stress caused by misaligned installation, avoids seal failure and leakage; and provides a unique and accurate installation angle for dense piping in complex cabins, achieving efficient and error-free assembly.

[0005] Currently, the location of the perforated pipe fittings is determined manually by visual inspection during loading. This not only reduces work efficiency and affects production capacity, but also results in low positioning accuracy of the perforation, affecting the quality of pipe bending and increasing production costs. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a method and mechanism for angular positioning of pre-bend openings in pipes. This method can automatically and accurately position the opening, reduce labor costs, improve work efficiency, increase production capacity, and simultaneously improve product quality.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A method for angular positioning of a pre-bending hole in a pipe bend, employing a pre-bending hole angular positioning mechanism, characterized in that: the pre-bending hole angular positioning mechanism comprises: a base mounted on a pipe bending machine; a support assembly disposed at the lower part of the base; a lifting assembly disposed at the upper part of the base; an elastic positioning assembly longitudinally disposed at the upper part of the base and connected to the lifting assembly, with a positioning pin at its lower end; a first proximity switch mounted on the lifting assembly; a pin assembly mounted at the lower part of the elastic positioning assembly, having a pin inserted into the upper part of the positioning pin; and a second proximity switch mounted at the lower part of the elastic positioning assembly and located below the pin assembly.

[0009] The positioning method includes the following steps:

[0010] S1: Before bending the pipe, the feeding trolley moves to feed the pipe into the pre-bending angle positioning mechanism. The position of the mounting seat is adjusted so that the support component is directly below the pipe. The support component moves to support the lower end of the pipe.

[0011] S2: The lifting component moves, causing the positioning pin of the elastic positioning component to descend and press against the surface of the pipe fitting. The first proximity switch is triggered, and the lifting component stops.

[0012] S3: The feeding trolley drives the pipe to rotate, the elastic positioning component is positioned at the opening position on the pipe, the positioning pin extends into the lower part of the opening, and the first proximity switch stops.

[0013] S4: When the ejector assembly moves to press down the ejector pin and triggers the second proximity switch, the ejector pin is pressed into the positioning pin, and the opening position on the pipe is accurately positioned; if the ejector assembly moves to press down the ejector pin and the second proximity switch does not respond, the feeding trolley rotates the pipe until the second proximity switch is triggered, the ejector pin is pressed into the lower part of the positioning pin, the opening position on the pipe is accurately positioned, and the feeding trolley stops rotating.

[0014] S5: The ejector pin assembly releases the ejector pin, and the ejector pin resets and moves upward;

[0015] S6: The lifting component moves the elastic positioning component upward to release the pipe fitting, and the positioning pin moves out of the opening;

[0016] S7: The support component no longer supports the lower end of the pipe; the feeding trolley drives the pipe forward to perform bending processing.

[0017] Preferably, the base includes an adjusting seat and a mounting seat disposed on the upper end of the adjusting seat, the mounting seat having a C-shaped opening; the support assembly includes a dovetail slide rail fixed on the mounting seat and a dovetail slider cooperating with the dovetail slide rail, the inner side of the dovetail slide rail is hollow to form a through hole, a lead screw passes through the through hole from the upper end of the dovetail slide rail and is threadedly connected to a nut seat therein, the outer end of the nut seat is fixedly connected to the dovetail slider; the upper part of the lead screw is mounted on the dovetail slide rail through a bearing seat, and the upper end of the lead screw has a handle;

[0018] The outer end of the dovetail slider is fixedly provided with an adapter plate. The lower part of the outer end of the adapter plate is provided with a slot. The mounting block is fixedly mounted on the slot. The upper end of the mounting block is provided with mounting slopes on both sides. Two sets of universal ball joints for supporting the pipe are symmetrically provided on the mounting slopes on both sides. A wedge block is provided between the inner wall of the dovetail slider and the outer wall of the dovetail slide rail. Multiple adjustment holes are opened on the side wall of the dovetail slider. Adjustment bolts are screwed into the adjustment holes and pressed onto the wedge block.

[0019] In step S1, loosen the adjusting bolt, turn the handle to move the dovetail slider, adapter plate and mounting block upward relative to the dovetail slide rail and support them at the lower end of the pipe fitting, and tighten the adjusting bolt to press them onto the wedge block;

[0020] In step S7, loosen the adjusting bolt, turn the handle, and move the dovetail slider, adapter plate and mounting block down relative to the dovetail slide rail so that they are no longer supported on the lower end of the pipe fitting. Tighten the adjusting bolt to press them onto the wedge block.

[0021] Preferably, the lifting assembly includes a lifting cylinder that is fixedly mounted longitudinally in the mounting base, a horizontally arranged connecting plate above the mounting base, a piston rod of the lifting cylinder that extends out of the upper end of the mounting base and is fixedly connected to the connecting plate, and the outside of the connecting plate is connected to an elastic positioning assembly.

[0022] In step S2, the lifting cylinder is activated, and the piston rod of the lifting cylinder pulls down the connecting plate so that the lower end of the elastic positioning component is pressed against the upper surface of the pipe.

[0023] In step S6, the lifting cylinder is activated, and the piston rod of the lifting cylinder pushes against the connecting plate, causing the lower end of the elastic positioning component to loosen from the upper surface of the pipe.

[0024] Preferably, the upper end of the mounting base is longitudinally inserted with multiple optical shafts that can move up and down, and the upper end of the mounting base is correspondingly fixed with multiple first guide sleeves, and the upper end of the optical shaft extends out of the first guide sleeve and is fixedly connected to the connecting plate.

[0025] In steps S2 and S6, when the piston rod of the lifting cylinder pulls down or pushes up the connecting plate, multiple optical axes move up and down relative to the mounting base and the first guide sleeve.

[0026] Preferably, the elastic positioning assembly includes a longitudinally arranged guide cylinder, a guide shaft, and a positioning pin. The guide cylinder is sleeved on the outside of the guide shaft 25, and the guide shaft can slide up and down relative to the guide cylinder. The lower end of the guide shaft extends out of the guide cylinder and is threadedly connected to the upper end of the positioning pin. The positioning pin positions the opening on the tube. The upper end of the mounting base is provided with an assembly hole, and a second guide sleeve is fixedly provided on the assembly hole. The guide cylinder passes through the second guide sleeve, and its upper part is threadedly connected to the connecting plate and has a limiting end cap at its upper end. The guide shaft is provided with a plurality of annular guide blocks that abut against the inner wall of the guide cylinder at intervals. A first spring is sleeved on the upper part of the guide shaft, and the first spring abuts between the upper guide block and the limiting end cap. The upper end of the guide shaft extends out of the limiting end cap and is fixedly provided with a limiting piece. The upper end of the connecting plate is fixedly provided with a first switch seat, and a first proximity switch is provided on the first switch seat.

[0027] In step S2, the first proximity switch detects the position of the limiting plate; the positioning pin descends and presses against the surface of the pipe, the guide shaft moves upward relative to the guide cylinder and squeezes the first spring, the limiting plate moves upward, triggering the first proximity switch, and the lifting cylinder stops descending;

[0028] In step S3, when the positioning pin is positioned in the opening, the guide shaft moves downward under the action of elastic force and gravity, the lower part of the positioning pin extends into the opening, the limit piece moves downward, and the first proximity switch is disconnected.

[0029] Preferably, the positioning pin includes a pin body and a stop block circumferentially disposed on the side wall of the pin body. The upper end of the pin body is provided with an insertion hole extending to the inner side of the pin body. The bottom of the guide shaft is provided with a connecting hole, and the outer end of the connecting hole forms a limiting groove. The upper end of the stop block is provided with an abutment block. The pin body includes a connecting part that is threadedly connected to the connecting hole above the abutment block and a positioning part that is located below the stop block. The abutment block is adapted to be installed in the limiting groove. Multiple longitudinal cuts are evenly distributed circumferentially on the side wall of the positioning part. When the positioning pin positions the opening of the pipe fitting, the stop block abuts against the surface of the pipe fitting, and the positioning part extends into the pipe fitting along the opening.

[0030] In steps S3 and S4, the positioning part of the positioning pin extends into the pipe along the opening, and the stop block abuts against the surface of the pipe.

[0031] Preferably, the ejector assembly includes a pen-shaped cylinder and an ejector pin; the pen-shaped cylinder is longitudinally fixed on the lower side wall of the guide shaft, and a connecting piece is fixedly provided on the lower part of the piston rod of the pen-shaped cylinder; a displacement hole is longitudinally provided on the side wall of the guide shaft, and the displacement hole communicates with the connecting hole; the ejector pin is inserted into the insertion hole, and a second spring is sleeved on the ejector pin, the second spring supporting the upper end of the pin and the upper part of the ejector pin; the connecting piece extends into the displacement hole to press the upper end of the ejector pin; a second switch seat is fixedly provided on the lower side wall of the guide shaft below the pen-shaped cylinder, and a second proximity switch is provided on the second switch seat;

[0032] In step S4, the pen-shaped cylinder drives the connecting piece to press the pin down along the displacement hole, triggering the second proximity switch and pressing the pin into the pin body; or the pen-shaped cylinder drives the connecting piece to press the pin down along the displacement hole, but the second proximity switch is not triggered and the pin cannot enter the pin body.

[0033] In step S5, the pen-shaped cylinder moves upward, and the ejector pin moves upward under the action of the second spring.

[0034] Preferably, the upper end of the adjusting seat is provided with T-shaped grooves on both sides, and T-shaped sliders are adapted in the grooves. The lower end of the mounting seat is fixed to the adjusting seat by multiple fasteners inserted into the sliders.

[0035] In step S1, multiple fasteners are loosened, which causes the mounting base to slide on the adjusting base to adjust the position of the mounting base.

[0036] Preferably, lifting rings are fixed on both sides of the upper end of the mounting base.

[0037] A bend-front opening angular positioning mechanism, characterized in that it is applied to the bend-front opening angular positioning method described in any one of the above-mentioned methods.

[0038] The present invention, by adopting the above technical solution, has the following beneficial effects:

[0039] ① The bend-pipe front opening angular positioning mechanism includes a base, a support assembly, a lifting assembly, an elastic positioning assembly, a first proximity switch, a pin assembly, and a second proximity switch. The base includes an adjusting seat and a mounting seat. The mounting seat can move left and right relative to the adjusting seat to allow the pipe fitting to enter the mounting seat. The support assembly can move up and down to support the pipe fitting. The first proximity switch automatically detects the position of the limiting plate and monitors the movement of the guide shaft and the positioning pin. When the positioning pin is pressed against the surface of the pipe fitting, the limiting plate moves upward, triggering the first proximity switch, and the lifting cylinder stops. When the positioning pin extends into the opening, the limiting plate descends, and the first proximity switch stops. The lifting assembly automatically drives the guide shaft and the positioning pin to move downward. The positioning pin is pressed against the surface of the pipe fitting, and during the rotation of the pipe fitting, the positioning pin extends into the opening. The side wall of the positioning part where the positioning pin extends into the opening has multiple longitudinal cuts evenly distributed circumferentially, allowing the positioning part to deform and enter the opening, completing the initial positioning.

[0040] The second proximity switch detects the position of the connecting piece on the piston rod of the pen-shaped cylinder to determine the movement state of the ejector pin. When the pen-shaped cylinder presses down on the ejector pin through the connecting piece, the connecting piece moves down and triggers the second proximity switch, indicating that the ejector pin has entered the positioning part of the positioning pin, the positioning part is compatible with the opening, and the opening position on the pipe is accurately positioned. If the pen-shaped cylinder presses down on the ejector pin through the connecting piece, but the connecting piece moves down without triggering the second proximity switch, it means that the ejector pin cannot enter the positioning part of the positioning pin. That is, the diameter of the positioning part is larger than the size of the opening when viewed directly, indicating that the positioning part deforms and enters the opening. The positioning part shrinks and the inner diameter becomes narrower, so the ejector pin cannot enter, and the opening position is slightly off. The feeding trolley continues to rotate the bent pipe until the ejector pin enters the positioning part of the positioning pin, and the second proximity switch reacts, indicating that the opening position is accurately positioned, and the feeding trolley stops rotating the bent pipe.

[0041] In this way, after the pipe fitting is fed into the mechanism, it is first positioned by the positioning pin, and then precisely positioned by the ejector pin and the second proximity switch. This two-positioning method can automatically and accurately position the opening without the need for manual determination of the opening position, reducing labor costs, improving work efficiency, increasing production capacity, and improving the accuracy of the opening position, thereby improving product quality.

[0042] ② By adjusting the vertical position of the dovetail slider and the mounting block, adaptive support can be provided for pipes of different diameters.

[0043] The use of omnidirectional ball bearings prevents pipe swaying while providing omnidirectional, low-friction, flexible movement, greatly facilitating pipe rotation and positioning.

[0044] ③ Multiple optical axes are installed on the upper end of the mounting base to cooperate with the guide sleeve, which can make the lifting cylinder move up and down more smoothly.

[0045] ④ The locating pin is fixed to the guide shaft by a threaded connection, and the locating pin can be quickly replaced according to the size of the opening.

[0046] ⑤ The first spring is installed inside the guide cylinder and is positioned between the guide block of the guide shaft and the limiting end cap. This allows the guide shaft to slide relative to the guide cylinder. When the positioning pin is pressed against the surface of the pipe, there is elastic contact, and the pipe can rotate, which facilitates the positioning of the opening.

[0047] ⑥ The lower part of the positioning pin has multiple longitudinal cuts. This way, even if the opening position is slightly off, the positioning pin can deform and extend into it, which facilitates the initial positioning of the positioning pin and enables the positioning pin to be quickly positioned.

[0048] ⑦ The action of pressing down the ejector pin adopts a pen-shaped cylinder, which saves assembly space and is economical and practical. Attached Figure Description

[0049] Figure 1 This is a schematic diagram illustrating the steps of a method for angular positioning of a pre-bend opening in a pipe.

[0050] Figure 2 This is a schematic diagram of the arrangement of a pre-bending angular positioning mechanism on a pipe bending machine.

[0051] Figure 3 for Figure 1 A top-view structural diagram.

[0052] Figure 4 This is a three-dimensional structural diagram of a positioning mechanism for positioning pipe fittings before bending.

[0053] Figure 5 This is a three-dimensional structural diagram of a pre-bend angular positioning mechanism for pipe bending.

[0054] Figure 6 This is a side view of a positioning mechanism for positioning pipe fittings with a pre-bend hole.

[0055] Figure 7 for Figure 5 Schematic diagram of the BB-direction section.

[0056] Figure 8 This is a front structural diagram of a pipe bend pre-opening angular positioning mechanism for positioning pipe fittings.

[0057] Figure 9 for Figure 7 A schematic diagram of the AA-direction section.

[0058] Figure 10 This is a schematic diagram of the locating pin on the surface of the pipe fitting.

[0059] Figure 11 This is a schematic diagram showing the locating part of the locating pin entering the opening.

[0060] Figure 12 This is a schematic diagram of the positioning part where the ejector pin is pressed into the positioning pin.

[0061] Figure 13 This is a schematic diagram showing the engagement of the pen-shaped cylinder, connecting piece, and ejector pin before the ejector pin is pressed into the positioning part.

[0062] Figure 14 This is a schematic diagram showing the engagement of the pen-shaped cylinder, connecting piece, and ejector pin after the ejector pin is pressed into the positioning part.

[0063] Figure 15 This is a three-dimensional structural diagram of a locating pin.

[0064] Figure 16 This is a schematic diagram of the three-dimensional structure of a thimble.

[0065] Figure 17 A three-dimensional structural diagram of the guide shaft.

[0066] Figure 18A schematic diagram of the three-dimensional structure supporting the components.

[0067] Figure 19 This is a schematic diagram of the exploded structure of the supporting components.

[0068] Figure 20 This is a schematic diagram of the wedge block arrangement.

[0069] Figure 21 This is a three-dimensional structural diagram of the mounting base.

[0070] Figure 22 This is a three-dimensional structural diagram of the adjustment seat. Detailed Implementation

[0071] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0072] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0076] like Figures 1-22 The method for angular positioning of a pre-opening hole in a bend, as shown, employs a pre-opening hole angular positioning mechanism 300.

[0077] The pipe bending pre-hole angular positioning mechanism 300 includes: a base 1, mounted on a pipe bending machine 2; a support assembly, disposed at the lower part of the base 1; a lifting assembly, disposed at the upper part of the base 1; an elastic positioning assembly, longitudinally disposed at the upper part of the base 1 and connected to the lifting assembly, with a positioning pin 3 at its lower end; a first proximity switch 5, mounted on the lifting assembly; a pin assembly, mounted at the lower part of the elastic positioning assembly, having a pin 6 inserted into the upper part of the positioning pin 3; and a second proximity switch 7, mounted at the lower part of the elastic positioning assembly and located below the pin assembly.

[0078] like Figure 1 The method for angular positioning of the pre-opening hole in a bend pipe, as shown, includes the following steps:

[0079] S1: Before bending the pipe, the feeding trolley 100 moves to send the pipe fitting 200 into the four corner positioning mechanism of the opening before bending the pipe. The position of the mounting seat 9 is adjusted so that the support component is directly below the pipe fitting. The support component moves to support the lower end of the pipe fitting.

[0080] S2: The lifting component moves to lower the positioning pin 3 of the elastic positioning component to the surface of the pipe fitting, triggering the first proximity switch 5 and stopping the lifting component.

[0081] S3: The feeding trolley drives the pipe to rotate, the elastic positioning component is positioned at the opening 4 on the pipe, the lower part of the positioning pin 3 extends into the opening 4, and the first proximity switch 5 stops.

[0082] S4: When the ejector assembly moves, it presses down the ejector pin 6 and triggers the second proximity switch 7. The ejector pin 6 is then pressed into the positioning pin 3, and the opening 4 on the tube is accurately positioned. If the ejector assembly moves, it presses down the ejector pin 6, and the second proximity switch 7 does not respond, the feeding trolley rotates the tube until the second proximity switch 7 is triggered. The ejector pin 6 is then pressed into the lower part of the positioning pin 3, and the opening 4 on the tube is accurately positioned. The feeding trolley then stops rotating.

[0083] S5: The ejector pin assembly releases ejector pin 6, and ejector pin 6 resets and moves upward;

[0084] S6: The lifting component moves the elastic positioning component upward to release the pipe fitting, and the positioning pin 3 moves out of the opening 4.

[0085] S7: The support component no longer supports the lower end of the pipe; the feeding trolley drives the pipe forward to perform bending processing.

[0086] In the above technical solution, the pre-bend angular positioning mechanism includes a base, a support assembly, a lifting assembly, an elastic positioning assembly, a first proximity switch, a pin assembly, and a second proximity switch. The support assembly supports the pipe fitting and prevents it from swaying. The lifting assembly moves the positioning pin downwards to elastically press against the surface of the pipe fitting, triggering the first proximity switch. The lifting cylinder of the lifting assembly stops, and the pipe fitting can rotate when elastically pressed (the feeding device for rotating the pipe fitting has been disclosed in the background art). The feeding trolley 100 rotates the pipe fitting, and when the positioning pin is positioned at the opening, the lower part of the positioning pin extends into the opening, and the first proximity switch closes. In the pin assembly, the pin is pressed down, triggering the second proximity switch. The pin is pressed into the lower part of the positioning pin, and the opening position on the pipe fitting is accurately positioned. If the pin is pressed down but the second proximity switch is not triggered, the pipe fitting is rotated until the second proximity switch is triggered, and the pin is pressed into the lower part of the positioning pin, and the opening position on the pipe fitting is accurately positioned.

[0087] In this way, after the pipe fitting is fed into the mechanism, it is first positioned by the positioning pin, and then precisely positioned by the ejector pin and the second proximity switch. These two positioning operations can automatically and accurately locate the position of the opening, eliminating the need for manual determination of the opening position, reducing labor costs, improving work efficiency, increasing production capacity, and improving the accuracy of the opening position, thereby improving product quality and improving the processing precision and efficiency of pipe bending. This is suitable for automated pipe bending production lines.

[0088] like Figures 18-22 As shown, the base 1 includes an adjusting seat 8 and a mounting seat 9 disposed on the upper end of the adjusting seat 8. The mounting seat 9 has a C-shaped opening. The support assembly includes a dovetail slide rail 10 fixed on the mounting seat 9 and a dovetail slider 11 that cooperates with the dovetail slide rail 10. The inner side of the dovetail slide rail 10 is hollow to form a through hole. A lead screw 12 passes through the through hole from the upper end of the dovetail slide rail 10 and is threadedly connected to a nut seat therein. The outer end of the nut seat is fixedly connected to the dovetail slider 11. The upper part of the lead screw 12 is mounted on the dovetail slide rail 10 through a bearing seat. A handle 13 is provided at the upper end of the lead screw 12.

[0089] The outer end of the dovetail slider 11 is fixedly provided with an adapter plate 14. The lower part of the outer end of the adapter plate 14 is provided with a slot. The mounting block 15 is fixedly mounted on the slot. The upper end of the mounting block 15 is provided with mounting inclined surfaces on both sides. Two sets of universal ball joints 16 for supporting the pipe fittings are symmetrically provided on the mounting inclined surfaces on both sides. A wedge block 17 is provided between the inner wall of the dovetail slider 11 and the outer wall of the dovetail slide rail 10. Multiple adjustment holes 18 are opened on the side wall of the dovetail slider 11. Adjustment bolts 19 are screwed into the adjustment holes 18 and pressed onto the wedge block 17.

[0090] In step S1, loosen the adjusting bolt 19, turn the handle 13, and drive the dovetail slider 11, the adapter plate 14 and the mounting block 15 to move upward relative to the dovetail slide rail 10 and support the lower end of the pipe. Tighten the adjusting bolt 19 to press it onto the wedge block 17.

[0091] In step S7, loosen the adjusting bolt 19, turn the handle 13, and drive the dovetail slider 11, the adapter plate 14 and the mounting block 15 to move down relative to the dovetail slide rail 10 and no longer support the lower end of the pipe fitting. Tighten the adjusting bolt 19 to press it onto the wedge block 17.

[0092] In the above technical solution, the handle is a star-shaped handle, which is convenient for users to rotate. The mounting base has a C-shaped opening 60, facilitating the entry of pipe fittings into the mechanism and the installation of various components. The dovetail slide rail and dovetail slider work together to provide high rigidity, high load-bearing capacity, and vibration and impact resistance, improving the stability of the universal ball assembly. The lead screw and nut seat work together to drive the mounting block and universal ball assembly to move up and down, thus facilitating the adjustment of the vertical position of the supporting components. The support uses two sets of universal ball assemblies; in this case, each set has three universal balls, for a total of six universal balls on both sides, inclined to support the bottom of the pipe fitting. This provides precise control of the pipe fitting's position while offering omnidirectional, low-friction, flexible movement, greatly facilitating pipe fitting rotation and positioning. The wedge block, in conjunction with the adjusting bolt, presses the dovetail slider firmly onto the dovetail slide rail, improving support rigidity and positioning accuracy, and preventing positioning errors caused by loosening.

[0093] like Figures 4-9 As shown, the lifting assembly includes a lifting cylinder 20 that is longitudinally fixed in the mounting base 9. A horizontally arranged connecting plate 21 is provided above the mounting base 9. The piston rod of the lifting cylinder 20 extends out of the upper end of the mounting base 9 and is fixedly connected to the connecting plate 21. The outside of the connecting plate 21 is connected to an elastic positioning assembly.

[0094] In step S2, the lifting cylinder 20 is activated, and the piston rod of the lifting cylinder 20 pulls down the connecting plate 21 so that the lower end of the elastic positioning component is pressed against the upper surface of the pipe.

[0095] In step S6, the lifting cylinder 20 is activated, and the piston rod of the lifting cylinder 20 pushes against the connecting plate 21, causing the lower end of the elastic positioning component to loosen from the upper surface of the pipe.

[0096] In this way, the lifting cylinder drives the connecting plate to achieve smooth lifting and lowering of the elastic positioning component, which is simple and reliable in structure.

[0097] Multiple vertically movable optical shafts 22 are longitudinally inserted into the upper end of the mounting base 9. Multiple first guide sleeves 23 are correspondingly fixed to the upper end of the mounting base 9. The upper ends of the optical shafts 22 extend out of the first guide sleeves 23 and are fixedly connected to the connecting plate 21. In steps S2 and S6, when the piston rod of the lifting cylinder 20 pulls down or pushes up the connecting plate 21, the multiple optical shafts 22 move vertically relative to the mounting base 9 and the first guide sleeves 23. In this way, the cooperation between the optical shafts and the first guide sleeves enhances the guiding and stability of the lifting process, prevents the connecting plate from tilting, ensures the vertical movement of the elastic positioning component, and improves the accuracy of lifting.

[0098] like Figures 4-9 and Figure 17 As shown, the elastic positioning assembly includes a longitudinally arranged guide cylinder 24, a guide shaft 25, and a positioning pin 3. The guide cylinder 24 is sleeved on the outside of the guide shaft 25, and the guide shaft 25 can slide up and down relative to the guide cylinder 24. The lower end of the guide shaft 25 extends out of the guide cylinder 24 and is threadedly connected to the upper end of the positioning pin 3. The positioning pin 3 positions the opening 4 on the tube. The upper end of the mounting base 9 is provided with an assembly hole, and a second guide sleeve 26 is fixedly installed in the assembly hole. The guide cylinder 24 passes through the second guide sleeve 26, and its upper part is connected to the connecting plate 2. 1. A threaded connection is provided with a limiting end cap 27 at the upper end; a plurality of annular guide blocks 28 are provided at intervals on the guide shaft 25 to abut against the inner wall of the guide cylinder 24; a first spring 29 is sleeved on the upper part of the guide shaft 25, and the first spring 29 abuts between the upper guide block 28 and the limiting end cap 27; the upper end of the guide shaft 25 extends out of the limiting end cap 27 and is fixedly provided with a limiting piece 30; a first switch seat 31 is fixedly provided on the upper end of the connecting plate 21, and a first proximity switch 5 is provided on the first switch seat 31;

[0099] In step S2, the first proximity switch 5 detects the position of the limiting piece 30; the positioning pin 3 descends and hits the surface of the pipe fitting, the guide shaft 25 moves upward relative to the guide cylinder 24 and squeezes the first spring 29, the limiting piece 30 moves upward, triggering the first proximity switch 5, and the lifting cylinder 20 stops descending;

[0100] In step S3, when the positioning pin 3 is positioned in the opening 4, the guide shaft 25 moves downward under the action of elastic force and gravity, the lower part of the positioning pin 3 extends into the opening 4, the limiting piece 30 moves downward, and the first proximity switch 5 is disconnected.

[0101] In the above technical solution, the guide shaft is slidably threaded onto the guide cylinder, with both ends extending out of the guide cylinder; the upper part of the guide cylinder is threadedly fixed to the connecting plate, and the guide cylinder passes through the second guide sleeve, which serves to guide and stabilize the guide cylinder; the guide block on the guide shaft can prevent it from wobbling relative to the guide cylinder; the first spring is set between the uppermost guide block and the limiting end cap of the guide cylinder, allowing the guide shaft to move up and down elastically; the positioning pin is fixed to the lower end of the guide shaft by a threaded connection, and the positioning pin can be quickly replaced according to the size of the opening.

[0102] A limiting plate is fixed at the upper end of the guide shaft. A first proximity switch detects the movement of the limiting plate and triggers the lifting cylinder. The first proximity switch can be a DC inductive proximity switch. The positioning pin presses against the surface of the pipe fitting. The guide shaft moves upward and compresses the first spring, causing the limiting plate to move upward, triggering the first proximity switch, and stopping the lifting cylinder. When the pipe fitting is rotated, the positioning pin extends into the opening, the guide shaft and the limiting plate descend, and the first proximity switch stops, completing the initial positioning of the opening.

[0103] like Figure 17 As shown, the cross-section 62 on the guide shaft is used to fix the pen-shaped cylinder, and the cross-section 63 is used to fix the second switch base.

[0104] like Figure 10 As shown, the locating pin rests against the surface of the pipe fitting. Figure 11 As shown, the locating pin extends into the opening to complete the initial positioning.

[0105] like Figures 4-16 As shown, the positioning pin 3 includes a pin body and a stop block 33 circumferentially disposed on the side wall of the pin body. The upper end of the pin body is provided with an insertion hole 34 extending to the inner side of the pin body. The bottom of the guide shaft 25 is provided with a connecting hole 35, and the outer end of the connecting hole 35 forms a limiting groove 36. The upper end of the stop block 33 is provided with an abutment block 37. The pin body includes a connecting part 47 that is threadedly connected to the connecting hole 35 above the abutment block 37, and a positioning part 48 that is located below the stop block 33. The abutment block 37 is adapted to be installed in the limiting groove 36. Multiple longitudinal cuts 38 are evenly distributed circumferentially on the side wall of the positioning part 48. When the positioning pin 3 positions the opening 4 of the pipe fitting, the stop block 33 abuts against the surface of the pipe fitting, and the positioning part 48 extends into the pipe fitting along the opening 4.

[0106] In steps S3 and S4, the positioning part 48 of the positioning pin 3 extends into the pipe through the opening 4, and the stop block 33 abuts against the surface of the pipe.

[0107] In the above technical solution, the contact area between the stop block and the pipe surface serves as a limit, preventing the positioning pin from shaking. The upper part of the positioning pin is threadedly connected to the connecting hole of the guide shaft, and the abutment block fits into the limiting groove, preventing the connecting part from moving further upward and improving the fit and stability with the guide shaft. The ejector pin is inserted into the insertion hole, and the lower part of the positioning pin is deformable through multiple circumferentially distributed longitudinal slits. This allows the positioning part to deform and enter the opening, enabling quick initial positioning and improving convenience.

[0108] The ejector assembly includes a pen-shaped cylinder 39 and an ejector pin 6. The pen-shaped cylinder 39 is longitudinally fixed on the lower side wall of the guide shaft 25. A connecting piece 40 is fixedly provided at the lower part of the piston rod of the pen-shaped cylinder 39. A displacement hole 41 is longitudinally provided on the side wall of the guide shaft 25, and the displacement hole 41 communicates with the connecting hole 35. The ejector pin 6 is inserted into the insertion hole 34. A second spring 42 is sleeved on the ejector pin 6. The second spring 42 supports the upper end of the pin body and the upper part of the ejector pin 6. The connecting piece 40 extends into the displacement hole 41 and presses the upper end of the ejector pin 6. A second switch seat 43 is fixedly provided on the lower side wall of the guide shaft 25 below the pen-shaped cylinder 39. A second proximity switch 7 is provided on the second switch seat 43.

[0109] In step S4, the pen-shaped cylinder 39 drives the connecting piece 40 to press down the ejector pin 6 along the displacement hole 41, triggering the second proximity switch 7, and the ejector pin 6 is pressed into the pin body; or the pen-shaped cylinder 39 drives the connecting piece 40 to press down the ejector pin 6 along the displacement hole 41, the second proximity switch 7 is not triggered, and the ejector pin 6 cannot enter the pin body.

[0110] In step S5, the pen-shaped cylinder 39 moves upward, and the ejector pin 6 moves upward under the action of the second spring 42.

[0111] Thus, the second proximity switch can be a miniature inductive proximity switch; the second proximity switch detects the position of the connecting piece on the piston rod of the pen-shaped cylinder to determine the movement state of the ejector pin; the pen-shaped cylinder presses down on the ejector pin through the connecting piece, the connecting piece moves down and triggers the second proximity switch, indicating that the ejector pin has entered the positioning part of the positioning pin, the positioning part is adapted to the opening, and the opening position on the pipe is accurately positioned; if the pen-shaped cylinder presses down on the ejector pin through the connecting piece, the connecting piece moves down but does not trigger the second proximity switch, it means that the ejector pin cannot enter the positioning part of the positioning pin, that is, the diameter of the positioning part is larger than the size of the opening when viewed from the front, indicating that the positioning part deforms and enters the opening, the inner diameter of the positioning part narrows, the ejector pin cannot enter, the opening position is slightly off, the feeding trolley continues to rotate the bent pipe until the ejector pin enters the positioning part of the positioning pin, the second proximity switch reacts, indicating that the opening position is accurately positioned, and the feeding trolley stops rotating the bent pipe.

[0112] like Figure 12 As shown, the ejector pin is pressed into the positioning part of the positioning pin, and the opening position on the pipe is accurately positioned.

[0113] like Figure 7 , 8 As shown in Figure 22, the upper end of the adjusting seat 8 is provided with T-shaped grooves 44 on both sides, and T-shaped sliders 45 are adapted to fit within the grooves 44. The lower end of the mounting seat 9 is pressed and fixed to the adjusting seat 8 by multiple fasteners inserted into the sliders 45. In step S1, the multiple fasteners are loosened, which acts on the mounting seat 9 to slide and adjust its position on the adjusting seat 8. In this technical solution, the mounting seat can slide relative to the adjusting seat. Loosening the multiple fasteners allows the mounting seat to slide and adjust its position on the adjusting seat, which can facilitate the adjustment of the left and right positions of the mechanism and its adaptation to the pipe fittings.

[0114] like Figure 4 and 5 As shown, lifting rings 46 are fixedly provided on both sides of the upper end of the mounting base 9. In this technical solution, the lifting rings are designed to facilitate user gripping and easy assembly / disassembly.

[0115] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0116] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A method for angular positioning of a pre-bend opening in a pipe, comprising a pre-bend opening angular positioning mechanism, characterized in that: The pipe bending front opening angle positioning mechanism includes: a base (1) installed on the pipe bending machine (2); a support assembly disposed at the lower part of the base (1); a lifting assembly disposed at the upper part of the base (1); an elastic positioning assembly disposed longitudinally at the upper part of the base (1) and connected to the lifting assembly, with a positioning pin (3) at its lower end; a first proximity switch (5) installed on the lifting assembly; a pin assembly installed at the lower part of the elastic positioning assembly, having a pin (6) inserted into the upper part of the positioning pin (3); and a second proximity switch (7) installed at the lower part of the elastic positioning assembly and located below the pin assembly. The positioning method includes the following steps: S1: Before bending the pipe, the feeding trolley moves to send the pipe into the angular positioning mechanism of the opening (4) before bending the pipe. Adjust the position of the mounting seat (9) so that the support component is directly below the pipe. The support component moves to support the lower end of the pipe. S2: The lifting component moves to lower the positioning pin (3) of the elastic positioning component to the surface of the pipe fitting, triggering the first proximity switch (5) and stopping the lifting component; S3: The feeding trolley drives the pipe to rotate, the elastic positioning component is positioned at the opening (4) on the pipe, the lower part of the positioning pin (3) extends into the opening (4), and the first proximity switch (5) stops. S4: The action of the ejector assembly presses down the ejector (6) and triggers the second proximity switch (7), then the ejector (6) is pressed into the positioning pin (3), and the position of the opening (4) on the pipe is accurately positioned; if the action of the ejector assembly presses down the ejector (6) and the second proximity switch (7) does not respond, then the feeding trolley rotates the pipe until the second proximity switch (7) is triggered, the ejector (6) is pressed into the lower part of the positioning pin (3), the position of the opening (4) on the pipe is accurately positioned, and the feeding trolley stops rotating; S5: The ejector pin assembly releases the ejector pin (6), and the ejector pin (6) resets and moves upward; S6: The lifting component moves the elastic positioning component upward to release the pipe fitting, and the positioning pin (3) moves out of the opening (4); S7: The support component no longer supports the lower end of the pipe; the feeding trolley drives the pipe forward to perform bending processing.

2. The method for angular positioning of a pre-bend opening in a pipe according to claim 1, characterized in that: The base (1) includes an adjustment seat (8) and a mounting seat (9) disposed on the upper end of the adjustment seat (8). The mounting seat (9) is provided with a C-shaped opening. The support assembly includes a dovetail slide rail (10) fixed on the mounting seat (9) and a dovetail slider (11) that cooperates with the dovetail slide rail (10). The inner side of the dovetail slide rail (10) is hollow to form a through hole. The lead screw (12) passes through the through hole from the upper end of the dovetail slide rail (10) and is threadedly connected to the nut seat therein. The outer end of the nut seat is fixedly connected to the dovetail slider (11). The upper part of the lead screw (12) is mounted on the dovetail slide rail (10) through a bearing seat. The upper end of the lead screw (12) is provided with a handle (13). The outer end of the dovetail slider (11) is fixedly provided with a transition plate (14). The lower part of the outer end of the transition plate (14) is provided with a slot. The mounting block (15) is fixedly mounted on the slot. The upper end of the mounting block (15) is provided with mounting slopes on both sides. Two sets of universal ball joints (16) for supporting pipe fittings are symmetrically provided on the mounting slopes on both sides. A wedge block (17) is provided between the inner wall of the dovetail slider (11) and the outer wall of the dovetail slide rail (10). Multiple adjustment holes (18) are opened on the side wall of the dovetail slider (11). Adjustment bolts (19) are screwed into the adjustment holes (18) and pressed onto the wedge block (17). In step S1, loosen the adjusting bolt (19), turn the handle (13), and drive the dovetail slider (11), the adapter plate (14) and the mounting block (15) to move upward relative to the dovetail slide rail (10) and support the lower end of the pipe fitting. Tighten the adjusting bolt (19) to press it onto the wedge block (17). In step S7, loosen the adjusting bolt (19), turn the handle (13), and drive the dovetail slider (11), adapter plate (14) and mounting block (15) to move down relative to the dovetail slide rail (10) and no longer support the lower end of the pipe fitting. Tighten the adjusting bolt (19) and press it onto the wedge block (17).

3. The method for angular positioning of a pre-bend opening in a pipe according to claim 1, characterized in that: The lifting assembly includes a lifting cylinder (20) that is fixedly installed in the mounting base (9) in the longitudinal direction. A horizontally arranged connecting plate (21) is provided above the mounting base (9). The piston rod of the lifting cylinder (20) extends out of the upper end of the mounting base (9) and is fixedly connected to the connecting plate (21). The outside of the connecting plate (21) is connected to the elastic positioning assembly. In step S2, the lifting cylinder (20) is activated, and the piston rod of the lifting cylinder (20) pulls down the connecting plate (21) so that the lower end of the elastic positioning component is pressed against the upper surface of the pipe. In step S6, the lifting cylinder (20) is activated, and the piston rod of the lifting cylinder (20) pushes against the connecting plate (21) to loosen the lower end of the elastic positioning component from the upper surface of the pipe.

4. The method for angular positioning of a pre-bend opening in a pipe according to claim 3, characterized in that: The upper end of the mounting base (9) is longitudinally inserted with multiple optical shafts (22) that can move up and down. The upper end of the mounting base (9) is correspondingly fixed with multiple first guide sleeves (23). The upper end of the optical shaft (22) extends out of the first guide sleeve (23) and is fixedly connected to the connecting plate (21). In steps S2 and S6, when the piston rod of the lifting cylinder (20) pulls down or pushes up the connecting plate (21), multiple optical axes (22) move up and down relative to the mounting base (9) and the first guide sleeve (23).

5. The method for angular positioning of a pre-bend opening in a pipe according to claim 3, characterized in that: The elastic positioning assembly includes a longitudinally arranged guide cylinder (24), a guide shaft (25), and a positioning pin (3). The guide cylinder (24) is sleeved on the outside of the guide shaft (25), and the guide shaft (25) can slide up and down relative to the guide cylinder (24). The lower end of the guide shaft (25) extends out of the guide cylinder (24) and is threadedly connected to the upper end of the positioning pin (3). The positioning pin (3) positions the opening (4) on the tube. The upper end of the mounting base (9) is provided with an assembly hole, and a second guide sleeve (26) is fixedly provided on the assembly hole. The guide cylinder (24) passes through the second guide sleeve (26), and its upper part is connected to the connecting plate (21). The guide shaft (25) is threaded and has a limiting end cap (27) at the top. Multiple annular guide blocks (28) are spaced apart on the guide shaft (25) and abut against the inner wall of the guide cylinder (24). A first spring (29) is sleeved on the upper part of the guide shaft (25) and abuts against the upper guide block (28) and the limiting end cap (27). The upper end of the guide shaft (25) extends out of the limiting end cap (27) and is fixedly provided with a limiting piece (30). A first switch seat (31) is fixedly provided on the upper end of the connecting plate (21), and a first proximity switch (5) is provided on the first switch seat (31). In step S2, the first proximity switch (5) detects the position of the limiting piece (30); the positioning pin (3) descends and hits the surface of the pipe fitting, the guide shaft (25) moves upward relative to the guide cylinder (24) and squeezes the first spring (29), the limiting piece (30) moves upward, triggering the first proximity switch (5), and the lifting cylinder (20) stops descending; In step S3, when the positioning pin (3) is positioned in the opening (4), the guide shaft (25) moves downward under the action of elastic force and gravity, the lower part of the positioning pin (3) extends into the opening (4), the limiting piece (30) moves down, and the first proximity switch (5) is disconnected.

6. The method for angular positioning of a pre-bend opening in a pipe according to claim 5, characterized in that: The positioning pin (3) includes a pin body and a stop block (33) circumferentially disposed on the side wall of the pin body. The upper end of the pin body is provided with an insertion hole (34) extending to the inner side of the pin body. The bottom of the guide shaft (25) is provided with a connecting hole (35). The outer end of the connecting hole (35) forms a limiting groove (36). The upper end of the stop block (33) is provided with an abutment block (37). The pin body includes a connecting part (47) threadedly connected to the connecting hole (35) above the abutment block (37) and a positioning part (48) below the stop block (33). The abutment block (37) is fitted into the limiting groove (36). Multiple longitudinal cuts (38) are evenly distributed circumferentially on the side wall of the positioning part (48). When the positioning pin (3) positions the opening (4) of the pipe fitting, the stop block (33) abuts against the surface of the pipe fitting, and the positioning part (48) extends into the pipe fitting along the opening (4). In steps S3 and S4, the positioning part (48) of the positioning pin (3) extends into the pipe along the opening (4), and the stop (33) abuts against the surface of the pipe.

7. The method for angular positioning of a pre-bend opening in a pipe according to claim 6, characterized in that: The ejector assembly includes a pen-shaped cylinder (39) and an ejector pin (6); the pen-shaped cylinder (39) is longitudinally fixed on the lower side wall of the guide shaft (25), and a connecting piece (40) is fixedly provided on the lower part of the piston rod of the pen-shaped cylinder (39). A displacement hole (41) is longitudinally provided on the side wall of the guide shaft (25), and the displacement hole (41) communicates with the connecting hole (35); the ejector pin (6) is inserted into the insertion hole (34), and a second spring (42) is sleeved on the ejector pin (6). The second spring (42) is supported between the upper end of the pin body and the upper part of the ejector pin (6). The connecting piece (40) extends into the displacement hole (41) and presses the upper end of the ejector pin (6); a second switch seat (43) is fixedly provided on the lower side wall of the guide shaft (25) below the pen-shaped cylinder (39), and a second proximity switch (7) is provided on the second switch seat (43). In step S4, the pen-shaped cylinder (39) drives the connecting piece (40) to press down the ejector pin (6) along the displacement hole (41), the second proximity switch (7) is triggered, and the ejector pin (6) is pressed into the pin body; or the pen-shaped cylinder (39) drives the connecting piece (40) to press down the ejector pin (6) along the displacement hole (41), the second proximity switch (7) is not triggered, and the ejector pin (6) cannot enter the pin body; In step S5, the pen-shaped cylinder (39) moves upward, and the ejector pin (6) moves upward under the action of the second spring (42).

8. The method for angular positioning of a pre-bend opening in a pipe according to claim 2, characterized in that: The upper end of the adjustment seat (8) is provided with T-shaped grooves (44) on both sides, and T-shaped sliders (45) are adapted in the grooves (44). The lower end of the mounting seat (9) is pressed and fixed on the adjustment seat (8) by multiple fasteners inserted into the sliders (45). In step S1, multiple fasteners are loosened, and the mounting base (9) is slidably adjusted on the adjusting base (8) to change the position of the mounting base (9).

9. The method for angular positioning of a pre-bend opening in a pipe according to claim 8, characterized in that: The upper end of the mounting base (9) is fixed with lifting rings (46) on both sides.

10. A pre-bend angular positioning mechanism for a pipe bend, characterized in that: An angular positioning method for a bend before opening is applied to any one of the claims 1 to 9 above.

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