Pipeline and bending method thereof

Abstract

The invention provides a pipeline and a bending method thereof. The pipeline bending method is used for bending spatial different-plane continuous bent pipes. The pipeline bending method comprises the steps that the included angle between the planes where the two adjacent bending parts are located is obtained, and the rotating arc length is obtained; and marking a pipeline central axis and a bending starting point of a first bending part in two adjacent bending parts on the to-be-bent pipeline. And the bending starting point of the second bending part in the two adjacent bending parts is obtained, the pipeline central axis of the second bending part is obtained by combining the bending direction and the rotating arc length of the second bending part, and the pipeline central axis and the bending starting point of the second bending part are marked on the to-be-bent pipeline. And marking all bent parts on the to-be-bent pipeline, and bending the to-be-bent pipeline to obtain the spatial different-plane continuous bent pipe.

Description

Technical Field

[0001] The invention relates to pipe bending, and in particular to a pipe and a bending method thereof. Background Art

[0002] With the advancement of society, pipe bending has become widely used in engineering construction. A continuous, spatially non-planar pipe bend is a pipe formed by two (or more) consecutive bends that form a plane that is not in the same plane. The difficulty in bending continuous, spatially non-planar pipe bends lies in the subsequent bending of the second, third, and so on, beyond the first bend. This requires consideration of whether the final spatial orientation of each subsequent bend is consistent with the design requirements of the drawing.

[0003] The existing method for continuous pipe bending in spatially unequal planes is as follows: first, the bend starting point is determined, then the first bend is made by marking the pipe. After the first bend is made, the starting point of the next bend (the second bend) is determined on the straight pipe section after the first bend end point. The first bend is then adjusted by continuous rotation until the final spatial orientation of the first and second bends is consistent with the design drawings, as measured using tools such as a level, angle ruler, and plumb line. The pipe is then clamped with a fixture to bend the second bend. The above steps are repeated for the third bend.

[0004] However, the above bending methods currently have the following drawbacks: First, they are inefficient. Each bend requires measuring the angle and constantly adjusting the pipe rotation. Finally, when fine-tuning the pipe angle to achieve the design direction, the bending fixture must be repeatedly loosened and tightened to secure the pipe (loosening to facilitate pipe rotation, and tightening to secure the pipe during bending). This is time-consuming. Second, they suffer from low precision. The straightness of the pipe itself and the errors caused by the construction workers when measuring the angle all contribute to the low precision of the final bend, making it difficult to meet the design requirements. Summary of the Invention

[0005] The object of the present invention is to provide a pipe and a bending method thereof, which can improve the pipe bending efficiency.

[0006] One aspect of the present invention provides a pipe bending method for bending a continuous pipe with different planes. The pipe bending method comprises: obtaining the angle between the planes where two adjacent bending parts are located to obtain the rotation arc length; marking the pipe center axis and the bending starting point of a first bending part of the two adjacent bending parts on the pipe to be bent; obtaining the bending starting point of a second bending part of the two adjacent bending parts, combining the bending direction of the second bending part and the rotation arc length to obtain the pipe center axis of the second bending part, and marking the pipe center axis and the bending starting point of the second bending part on the pipe to be bent; marking all the bending parts on the pipe to be bent, bending the pipe to be bent, and obtaining a continuous pipe with different planes.

[0007] In one embodiment, obtaining the angle between the planes where two adjacent bending portions are located to obtain the rotation arc length of the pipe to be bent includes: obtaining a plane where a first bending portion and a plane where a second bending portion are located among the two adjacent bending portions; obtaining the angle between the planes where the two adjacent bending portions are located by combining the centers of the first bending portion and the second bending portion; and obtaining the rotation arc length based on the angle.

[0008] In one embodiment, the rotation arc length satisfies:

[0009]

[0010] Wherein, L is the length of the rotation arc, D is the diameter of the pipe to be bent, and α is the angle.

[0011] In one embodiment, the angle between the planes where two adjacent curved portions are located satisfies:

[0012]

[0013] Wherein, ∠FEG is the angle;

[0014] The coordinates of point E satisfy:

[0015]

[0016] The coordinates of point F satisfy:

[0017]

[0018] The coordinates of point G satisfy:

[0019]

[0020] Among them, point A, point B, point C, and point D are respectively the first end point of the continuous bend pipe, the turning point of the first bend part, the turning point of the second bend part, and the second end point of the continuous bend pipe.

[0021] In one embodiment, marking the pipe center axis and the bending starting point of a first bending portion of two adjacent bending portions on the pipe to be bent includes: obtaining the pipe center axis of the first bending portion; determining the bending starting point of the first bending portion according to a drawing; placing the pipe to be bent horizontally, and marking the pipe center axis and the bending starting point of the first bending portion on the pipe to be bent.

[0022] In one embodiment, obtaining the bending starting point of the second bending portion of the two adjacent bending portions, combining the bending direction of the second bending portion and the rotation arc length to obtain the pipe center axis of the second bending portion, and marking the pipe center axis and the bending starting point of the second bending portion on the pipe to be bent includes: marking a first line segment and a second line segment with a length of the rotation arc length on one side of an extension line of the pipe center axis of the first bending portion according to the bending direction of the second bending portion; wherein the first line segment and the second line segment are both perpendicular to the pipe center axis of the first bending portion and extend along the radial direction of the pipe to be bent; connecting the end of the first line segment and the end of the second line segment, and extending them to obtain the pipe center axis of the second bending portion; obtaining the bending starting point of the second bending portion according to a drawing; placing the pipe to be bent horizontally, and marking the pipe center axis and the bending starting point of the second bending portion on the pipe to be bent.

[0023] In one embodiment, marking all bending portions on the pipe to be bent, bending the pipe to be bent, and obtaining a spatially unequally sized continuous pipe bend comprises: marking all bending portions on the pipe to be bent; placing the pipe to be bent into a bending mold, and sequentially bending the pipe to be bent according to the pipe center axis of the bending portion and the bending starting point to obtain a spatially unequally sized continuous pipe bend.

[0024] In one embodiment, the process of placing the pipe to be bent into a bending die, and bending the pipe in sequence according to the central axis of the pipe at the bending portion and the bending starting point to obtain a spatially unequally shaped continuous pipe bend comprises: placing the pipe to be bent into a bending die; aligning the central axis of the pipe at the first bending portion with the gap between the jaws and the clamping block of the bending die, and aligning the bending starting point with the end of the jaws of the bending die; clamping the pipe to be bent and bending the first bending portion; stopping the pipe bending when the bending angle meets a preset requirement; loosening the clamp, rotating the pipe to be bent, and bending all the bending portions in sequence to obtain a spatially unequally shaped continuous pipe bend.

[0025] In one embodiment, the pipe bending method further includes: removing the pipe from the bending die and inspecting the pipe; wherein the inspection includes a combination of one or more of angle, wall thickness, ovality, bending radius, flatness and linear dimensions.

[0026] Another aspect of the present invention provides a pipe, which is bent by the pipe bending method according to any one of the above embodiments.

[0027] The pipe bending method of the present invention can accurately locate all the bending parts on the pipe through calculation and marking, so that the entire process of pipe bending is streamlined and standardized, and the quality of pipe bending is guaranteed to a great extent; moreover, the present invention does not need to continuously rotate the pipe during each bending process, thereby improving the pipe bending efficiency, reducing the number of construction personnel in the team, and reducing construction cost investment. Compared with traditional bending methods, more money can be saved while completing the same amount of work. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0029] Figure 1 It is a schematic diagram of a continuous elbow with different planes in space;

[0030] Figure 2 This is a schematic flow chart of an embodiment of a pipe bending method according to the present invention;

[0031] Figure 3 It is a schematic diagram of the pipeline space bend direction established in a three-dimensional rectangular coordinate system;

[0032] Figure 4 This is a schematic diagram of the markings before the bend;

[0033] Figure 5 This is a schematic diagram of pipe bending. DETAILED DESCRIPTION

[0034] The use of bending pipes in pressure pipelines can effectively reduce the total number of pipeline welds and reduce the welding workload on the construction site. In terms of construction progress, it can shorten the construction period and reduce construction cost investment. At the same time, the reduction in the total number of welds is beneficial to the safety and economy of pressure pipelines.

[0035] However, pressure pipe bending is a special process, and its quality control is particularly strict. In addition, the pressure pipe diameter is above DN50, and the bending process is complicated, especially for continuous bending of different surfaces in space. As a relatively complex structure, whether the bending direction is correct directly affects the quality of subsequent installation.

[0036] During the process of continuous bending of pipes in different planes in space, problems such as difficulty in determining the bending direction, low bending efficiency, and large deviation in the angle between two continuous bends that are not on the same plane after bending, resulting in material scrapping, were encountered, which directly affected the construction progress.

[0037] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the present invention, not to limit the present invention. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, features shown or described as part of one embodiment may be used together with another embodiment to produce yet another embodiment. Therefore, the present invention is intended to cover such modifications and variations as fall within the scope of the appended claims and their equivalents.

[0038] The term "continuous bends in space" refers to pipes where the planes formed by two (or more) continuous bends are not in the same plane. Figure 1 As shown, the planes formed by the two continuous bends are plane P1 and plane P2, and P1 and P2 are two non-parallel planes.

[0039] Figure 2 The steps of an embodiment of the pipe bending method of the present invention are shown. The pipe bending method of the present invention is used to bend a pipe to be bent, thereby producing a continuous, spatially skewed pipe bend. The pipe to be bent can be a pressure pipe, and specific pipe parameters such as diameter and length are not limited by the present invention. The pipe bending method of the present invention can address the low efficiency and precision issues of existing pipe bending technologies.

[0040] like Figure 2 As shown, the pipe bending method of the present invention includes steps S100 to S400:

[0041] In step S100, the angle between the planes of two adjacent bending parts is obtained to obtain the rotation arc length. The two adjacent bending parts refer only to two adjacent and continuous bending parts. The number of bending parts of the pipe to be bent is two or more, such as three, four, five or more.

[0042] For example, if there are three consecutive bends, namely bend W1, bend W2, and bend W3, then bends W1 and W2 are combined to form the first "two adjacent bends." In this "two adjacent bends," bend W1 is the first bend and bend W2 is the second bend. Bends W2 and W3 are combined to form the second "two adjacent bends." In this "two adjacent bends," bend W2 is the first bend and bend W3 is the second bend. If there are more bends, the same logic applies.

[0043] In step S200, the central axis of the first bending portion of two adjacent bending portions and the bending starting point are marked on the pipe to be bent, wherein the central axis of the pipe is the marking line of the plane where the bending portion is located.

[0044] In step S300, the bending starting point of the second bending part of the two adjacent bending parts is obtained, and the pipe center axis of the second bending part is obtained by combining the bending direction and the rotation arc length of the second bending part. The pipe center axis and the bending starting point of the second bending part are marked on the pipe to be bent.

[0045] In step S400, all bending locations on the pipe to be bent are marked, and the pipe to be bent is bent to obtain a spatially non-planar continuous bend.

[0046] The pipe bending method of the present invention can accurately locate all the bending parts on the pipe through calculation and marking, so that the entire process of pipe bending is streamlined and standardized, and the quality of pipe bending is guaranteed to a great extent; moreover, the present invention does not need to continuously rotate the pipe during each bending process, thereby improving the pipe bending efficiency, reducing the number of construction personnel in the team, and reducing construction cost investment. Compared with traditional bending methods, more money can be saved while completing the same amount of work.

[0047] In one embodiment, step S100 further includes steps S110 to S130:

[0048] In step S110, the plane where the first bending part and the plane where the second bending part of two adjacent bending parts are located are obtained. Specifically, Figure 3 The red line segment ABCD in the middle represents a continuous curved pipe with different planes in space, where points A, B, C and D are not collinear. Figure 3 The spatial non-planar continuous bend shown includes the first straight pipe section (the straight pipe section before the bending start point of the first bending part), the first bending part, the second straight pipe section (the straight pipe section between the bending end point of the first bending part and the bending start point of the second bending part), the second bending part, and the third straight pipe section (the straight pipe section after the bending end point of the second bending part). Figure 3Point A, point B, point C and point D. Point A is any point on the central axis of the first straight pipe section. Point A can be used as Figure 3 The starting point of the pipe section shown; point D is any point on the central axis of the third straight pipe section, point D can be used as Figure 3 Point B is the intersection of the central axis of the first straight pipe segment and the central axis of the second straight pipe segment; Point C is the intersection of the central axis of the second straight pipe segment and the central axis of the third straight pipe segment.

[0049] The coordinates of point A, point B, point C, and point D are A(Ax, Ay, Az), B(Bx, By, Bz), C(Cx, Cy, Cz), and D(Dx, Dy, Dz), respectively, all of which are known points on the drawing.

[0050] According to the coordinates of the above points, the plane where the first bending part is located (plane ABC, point A, point B and point C are not collinear) and the plane where the second bending part is located (plane BCD, point B, point C and point D are not collinear) can be obtained. Figure 1 and Figure 3 Understand.

[0051] The planes where the two bends are located are plane ABC and plane BCD respectively. Take any point in plane ABC and plane BCD and draw a perpendicular line perpendicular to BC. Translate the two perpendicular lines to the midpoint E of BC respectively. Draw the extension lines of the two perpendicular lines through point E. The intersection AC at point F and BD at point G. The formed ∠FEG is the angle between planes ABC and BCD, that is, the spatial angle of the non-planar bends.

[0052] The coordinates of point E satisfy:

[0053]

[0054] Point F lies in plane ABC and its coordinates satisfy:

[0055]

[0056] Point G lies in plane BCD, and its coordinates satisfy:

[0057]

[0058] In step S120, the centers of the first curved portion and the second curved portion are combined to obtain the angle between the planes where the two adjacent curved portions are located.

[0059] In this step, according to the above relationship and Figure 3 As shown, the angle between the planes of two adjacent bending parts satisfies:

[0060]

[0061] Among them, ∠FEG is the angle (°) between the planes where two adjacent bending parts are located.

[0062] In step S130, the arc length of rotation is obtained based on the included angle. This step converts the included angle into the arc length required to rotate on the pipe to be bent.

[0063] The arc length of rotation satisfies:

[0064]

[0065] Where L is the length of the rotation arc (mm), D is the diameter of the pipe to be bent (mm), and α is the angle (i.e. ∠FEG).

[0066] In one embodiment, step S200 further includes steps S210 to S230:

[0067] In step S210, the central axis of the pipeline at the first bending portion is obtained.

[0068] In step S220, the starting point of the first bend is determined based on the drawing. Specifically, the distance between point A and the starting point of the first bend can be obtained from the drawing, and the starting point of the first bend can be determined based on this distance. In other words, both the central axis and the starting point of the first bend can be obtained from the known drawing.

[0069] In step S230, the pipe to be bent is placed horizontally, and the pipe center axis and the bending starting point of the first bending portion are marked on the pipe to be bent.

[0070] In one embodiment, step S300 further includes steps S310 to S340:

[0071] In step S310, according to the bending direction of the second bending portion, a first line segment and a second line segment with a length of the rotation arc are marked on one side of the central axis of the pipe at the first bending portion. The first line segment and the second line segment are both perpendicular to the central axis of the pipe at the first bending portion and extend along the radial direction of the pipe to be bent, such as Figure 4 The side of the central axis of the pipe at the first bending portion is determined according to the actual bending direction of the second bending portion in the specific drawing, that is, the side closer to the bending direction of the second bending portion.

[0072] In step S320, the end of the first line segment and the end of the second line segment are connected and extended to obtain the central axis of the pipeline at the second curved portion.

[0073] In step S330, the bending starting point of the second bending portion is obtained according to the drawing size.

[0074] In step S340, the pipe to be bent is placed horizontally, and the pipe center axis and the bending starting point of the second bending portion are marked on the pipe to be bent.

[0075] At this point, the pipe center axis and the bend starting point of the first bend and the pipe center axis and the bend starting point of the second bend are marked on the pipe to be bent. If there are three or more bends, repeat steps S100 to S300 to mark all bends.

[0076] In one embodiment, step S400 further includes steps S410 to S420:

[0077] In step S410, all bending locations on the pipe to be bent are marked.

[0078] In step S420, the pipe to be bent is placed in a bending die and sequentially bent along the central axis of the pipe at the bend location and the bend starting point, resulting in a continuous, spatially skewed pipe bend. The bending die can be a pipe bender. The pipe bender includes a clamp for clamping the pipe.

[0079] like Figure 5 As shown, further, step S420 includes steps S421 to S425:

[0080] In step S421, the pipe to be bent is placed into a bending mold.

[0081] In step S422, the central axis of the pipe at the first bending portion is aligned with the gap between the bending die jaws and the clamping block, and the bending starting point is aligned with the end of the bending die jaws.

[0082] In step S423, the pipe to be bent is clamped and bent at the first bending portion.

[0083] In step S424, when the bending angle meets the preset requirement, the pipe bending is stopped. At this point, the first bending portion is completed.

[0084] In step S425, the clamp is released, the pipe to be bent is rotated, and all bends are bent sequentially to form a continuous, spatially skewed pipe bend. Steps S422 to S424 can be repeated to complete the bending of all bends. If there are three or more bends, the above steps are continued until the last bend is completed.

[0085] In one embodiment, the pipe bending method of the present invention further includes step S500:

[0086] In step S500, the pipe is removed from the bending die and inspected. Inspections include one or more combinations of angle, wall thickness, ovality, bend radius, flatness, and linear dimensions. These inspections must be performed on a horizontal platform. The clamps must be loosened before removing the pipe.

[0087] The pipe of the present invention is bent by the pipe bending method described in any of the above embodiments.

[0088] The pipe bending method of the present invention is further described below with reference to the above embodiments and the accompanying drawings, taking a pipe with two consecutive bends (i.e., two continuous bends) with a diameter of 114.3 mm as an example:

[0089] The first step is to calculate before bending the pipe. The coordinates of the starting point, end point and center of the two bending parts of the two consecutive bends in the drawing are used to calculate the spatial angle between the planes where the first bending part and the second bending part are located is 89°. The calculated arc length required to rotate on the pipe to be bent is 88.7 mm.

[0090] The second step is marking before bending the pipe. Place the pipe to be bent on a horizontal platform and use a marker to mark the center axis of the pipe at the first bending part and the starting point of the bend. According to the bending direction of the second bending part, mark two lines along the circumference of the pipe (the default is the left side in this example, and the left and right sides are determined according to the actual bending direction of the specific drawing) on ​​the left side of the identification line of the plane where the first bending part is located. The arc length is 88.7mm. Then connect the ends of the two line segments and extend them to make an identification line for the plane where the second bending part is located. Finally, mark the bending starting point of the second bending part on the pipe according to the drawing size, such as Figure 4 shown.

[0091] The third step is to bend the first bending part. Place the marked pipe into the bending mold, align the marking line of the plane where the first bending part is located with the gap between the mold jaws and the clamping block, align the bending starting point with the end of the mold jaws, start the power supply, and start bending the pipe. When the pipe bending angle meets the requirements, stop bending the pipe. Figure 5 shown.

[0092] The fourth step is to bend the second bend. Loosen the clamp (separate the jaws and the clamping block), rotate the pipe so that the marking line of the plane where the second bend is located is aligned with the gap between the mold jaws and the clamping block, push the pipe along the axis of the pipe so that the bending starting point of the second bend is aligned with the end of the mold jaws, clamp the pipe again, and start bending. When the pipe bending angle meets the requirements, stop bending. Figure 5 shown.

[0093] The fifth step is inspection. Loosen the clamp, remove the bent pipe from the pipe bender, measure the angle, wall thickness, and ovality of the bent pipe, and inspect the bending radius, flatness, and linear dimensions on a horizontal platform.

[0094] The following examples illustrate the direct economic benefits of the pipe bending method of the present invention, using the production of pipe bends for three nuclear power projects as examples. As shown in Tables 1 and 2, Project 1 currently involves a total of 834 pipe bends (501 consecutive bends), Project 2, which is designed by the same institute as Project 1, also involves 834 pipe bends (501 consecutive bends), and Project 3 involves a total of 977 pipe bends (445 consecutive bends).

[0095] Table 1 Time cost comparison calculation table

[0096]

[0097] Table 2 Human cost comparison calculation table

[0098]

[0099] In Table 1 and Table 2, “before improvement” indicates that the pipe is bent using the bending method before improvement, and “after improvement” indicates that the pipe is bent using the pipe bending method of the present invention.

[0100] Combining Tables 1 and 2, the pipe bending method of the present invention saves a total of 2×(9.5+9.5+3)=44 (man-days) in pipe bending. The pipe bending method of the present invention greatly saves time and labor costs, fully embodies the concept of low investment, high return, and resource conservation, improves pipe bending efficiency while ensuring pipe bending quality, and has the significance of being widely promoted.

[0101] Although the present invention is disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent variations, and modifications made to the above embodiments in accordance with the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. A pipe bending method, characterized in that: Used for bending continuous pipes with different planes in space; The pipe bending method comprises: Obtain the angle between the planes of two adjacent curved parts to obtain the length of the rotation arc; Marking the pipe center axis and the bending starting point of the first bending portion of the two adjacent bending portions on the pipe to be bent; Obtaining a bending starting point of a second bending portion of the two adjacent bending portions, and combining the bending direction of the second bending portion and the rotation arc length to obtain a pipe central axis of the second bending portion, and marking the pipe central axis and bending starting point of the second bending portion on the pipe to be bent; All bending parts are marked on the pipe to be bent, and the pipe to be bent is bent to obtain a spatial non-planar continuous bend.

2. The pipe bending method according to claim 1, characterized in that: The method of obtaining the angle between the planes where two adjacent bending parts are located to obtain the rotation arc length of the pipe to be bent includes: Obtaining a plane where a first bending portion and a plane where a second bending portion of two adjacent bending portions are located; Combining the centers of the first curved portion and the second curved portion, obtaining an angle between the planes where the two adjacent curved portions are located; The rotation arc length is obtained according to the included angle.

3. The pipe bending method according to claim 2, characterized in that: The rotation arc length satisfies: Wherein, L is the length of the rotation arc, D is the diameter of the pipe to be bent, and α is the angle.

4. The pipe bending method according to claim 3, characterized in that: The angle between the planes of two adjacent bending parts satisfies: Wherein, ∠FEG is the angle; The coordinates of point E satisfy: The coordinates of point F satisfy: The coordinates of point G satisfy: Among them, point A, point B, point C, and point D are respectively the first end point of the continuous bend pipe, the turning point of the first bend part, the turning point of the second bend part, and the second end point of the continuous bend pipe.

5. The pipe bending method according to any one of claims 2 to 4, characterized in that: The step of marking the pipe center axis and the bending starting point of the first bending portion of the two adjacent bending portions on the pipe to be bent comprises: Obtaining the central axis of the pipeline at the first curved portion; Determine the bending starting point of the first bending portion according to the drawing; The pipe to be bent is placed horizontally, and the pipe center axis and the bending starting point of the first bending portion are marked on the pipe to be bent.

6. The pipe bending method according to claim 5, characterized in that: The step of obtaining the bending starting point of the second bending portion of the two adjacent bending portions, combining the bending direction of the second bending portion and the rotation arc length to obtain the pipe center axis of the second bending portion, and marking the pipe center axis and the bending starting point of the second bending portion on the pipe to be bent includes: According to the bending direction of the second bending portion, a first line segment and a second line segment having a length equal to the rotation arc length are marked on one side of an extension line of the central axis of the pipe at the first bending portion; wherein the first line segment and the second line segment are both perpendicular to the central axis of the pipe at the first bending portion and extend in the radial direction of the pipe to be bent; Connecting the end of the first line segment and the end of the second line segment, and extending them to obtain the central axis of the pipeline at the second curved portion; Obtaining the bending starting point of the second bending portion according to the drawing; The pipe to be bent is placed horizontally, and the pipe center axis and the bending starting point of the second bending portion are marked on the pipe to be bent.

7. The pipe bending method according to claim 6, characterized in that: The method includes marking all the bending parts on the pipe to be bent, bending the pipe to be bent, and obtaining a spatial non-planar continuous bend pipe, which includes: Marking all the bending parts on the pipe to be bent; The pipe to be bent is placed in a bending die, and the pipe to be bent is bent in sequence according to the pipe center axis of the bending portion and the bending starting point to obtain a spatial non-planar continuous bend.

8. The pipe bending method according to claim 7, characterized in that: The method of placing the pipe to be bent into a bending die and sequentially bending the pipe to be bent according to the central axis of the pipe at the bending portion and the bending starting point to obtain a spatial non-planar continuous pipe bend comprises: placing the pipe to be bent into a bending die; Aligning the central axis of the pipe at the first bending portion with the gap between the bending die jaws and the clamping block, and aligning the bending starting point with the end of the bending die jaws; Clamping the pipe to be bent, and bending the pipe at the first bending portion; When the bending angle meets the preset requirements, stop bending the pipe; The clamp is released, the pipe to be bent is rotated, and all the bending parts are bent in sequence to obtain a spatial non-planar continuous bend.

9. The pipe bending method according to claim 7, wherein: The pipeline bending method further comprises: The pipe is removed from the bending die and inspected; wherein the inspection includes one or more combinations of angle, wall thickness, ovality, bending radius, flatness and linear dimensions.

10. A pipeline, characterized in that: The pipe is bent by the pipe bending method according to any one of claims 1 to 9.

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