Pipe bending device and method

Abstract

This invention discloses a pipe bending device and method. The pipe bending device includes a mandrel and a bending die device for bending conduits. The mandrel includes a mandrel body, multiple detection components for detecting the conduit diameter, and thermally expandable support beads. Heating wires and steel wires are installed on the support beads, which are flexibly connected to the mandrel body via the steel wires. The multiple detection components are evenly arranged around the mandrel body. The bending die device includes a frame and a rotating frame, a feeding mechanism, a guide die, a wheel die seat, and a clamping die mounted on the frame. After the mandrel is inserted into the conduit, the detection components determine whether the mandrel is qualified, and then the qualified mandrel is bent. This allows for the detection of the conduit dimensions before bending, thereby saving significant labor costs, subsequent inspection processes, and inspection time. It can improve the quality of the bent pipe product, reduce the scrap rate, and lower the enterprise's production costs.

Description

Technical Field

[0001] This invention relates to the field of pipe bending equipment, and more particularly to a pipe bending apparatus and method. Background Technology

[0002] Aircraft and rocket conduits play a crucial role in preparation, including fuel input, mechanism activation, pressure control, and environmental regulation. Failure or damage to any part of them could lead to a major tragedy of aircraft crashing and loss of life, or rocket failure, directly impacting the safety of officers, soldiers, and passengers.

[0003] The conduits used in aircraft and rockets are often thin-walled conduits. These conduits have extremely high requirements for specifications such as wall thickness, inner diameter, and bending angle, and their cost is also much higher than other types of conduits.

[0004] During the bending process of the conduit, since the specifications of many conduits on airplanes and rockets are similar, they cannot be accurately distinguished by the naked eye. Therefore, conduits of different specifications are often mixed together. Furthermore, since the conduit is a thin-walled component, in order to fix the conduit during the bending process, the end of the conduit is usually flattened, which leads to the conduit being scrapped. Summary of the Invention

[0005] To address the problem of high rejection rates in existing thin-walled conduits, the present invention aims to provide a pipe bending device and method. This solution can effectively distinguish the wall thickness of the conduit and provide effective support for the conduit end, thereby improving the pass rate of thin-walled conduit bending and reducing production costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a pipe bending method, which uses a pipe bending device, the pipe bending device including a mandrel and a bending die device for bending the conduit;

[0007] The mandrel includes a mandrel body, multiple detection components for detecting the diameter of the conduit, and a thermally expandable support bead. Heating wires and steel wires are installed on the support bead, and the support bead is flexibly connected to the mandrel body through the steel wires.

[0008] Multiple detection components are evenly arranged around the core rod body;

[0009] The bending die device includes a frame, a rotating frame, a feeding mechanism, a guide die, a wheel die holder, and a clamping die. There are two guide dies, which are installed on the frame with an adjustable spacing.

[0010] The feeding mechanism, guide mold, and rotating frame are all mounted on the machine frame, with the guide mold located between the feeding mechanism and the rotating frame; the wheel mold base and clamping mold are both mounted on the rotating frame; the wheel mold base is fixedly mounted on the rotating frame, and the rotating frame rotates around the center line of the wheel mold base, while the clamping mold is slidably mounted on the rotating frame; an arc-shaped forming groove and a straight first clamping groove are provided on the outer circumferential surface of the wheel mold base, and a straight second clamping groove is provided on the clamping mold, with the first clamping groove and the second clamping groove arranged face to face;

[0011] The specific steps are as follows:

[0012] Step 1), insert the mandrel into the catheter, and then use the testing assembly to check whether the inner diameter of the catheter is qualified;

[0013] Step 2): When the inner diameter of the conduit is not up to standard, mark the conduit and place it in the designated area; when the inner diameter of the conduit is up to standard, install the conduit on the feeding mechanism, and the feeding mechanism moves the conduit so that the conduit passes between the two guide molds and enters between the first clamping groove and the second clamping groove.

[0014] Step 3) The guide mold has clamped the outer wall of the catheter, making the catheter straight;

[0015] Step 4) Pull out the core rod body and move the support bead between the first clamping groove and the second clamping groove. Then heat the support bead to make it expand and support the inside of the catheter.

[0016] Step 5), drive the clamping mold to move closer to the wheel mold seat and clamp the guide tube;

[0017] Step 6), drive the rotating frame to rotate, the rotating frame drives the wheel mold base and clamping mold to move, so that the guide tube bends and gradually wraps around the forming groove of the wheel mold base;

[0018] Step 7) After the conduit is bent, the clamping mold and guide mold move away from the conduit, and the rotating frame drives the wheel mold seat and clamping mold to rotate and reset.

[0019] Step 8): After the support bead cools down, adjust the position of the guide tube and repeat steps 3) to 7) until the guide tube bending is completed.

[0020] Preferably, there are multiple support beads, which are spaced apart and flexibly connected by steel wire ropes.

[0021] Preferably, there are multiple heating wires, which are evenly arranged on the support beads.

[0022] Preferably, the wire rope and the support beads are tightly fitted together.

[0023] Preferably, the steel wire rope passes through the center of the support bead.

[0024] Preferably, in step 2) above, the positional relationship between the detection component and the end of the catheter is used to determine whether the inner diameter of the catheter is qualified.

[0025] Preferably, the detection assembly includes a first link, a second link, and a reset member. The two ends of the first link are a lower limit detection end and a first linkage end, respectively, and the two ends of the second link are an upper limit detection end and a second linkage end, respectively.

[0026] Both the first and second links are hinged to the core rod body. The reset member pushes the lower limit detection end of the first link and the upper limit detection end of the second link to tilt up, and the second linkage end of the second link presses on the first linkage end of the first link.

[0027] In step 2) above, when the actual inner diameter of the catheter is less than the lower limit of its specified inner diameter, the catheter pushes the lower limit detection end of the first connecting rod, causing the first linkage end of the first connecting rod to tilt up. The first linkage end of the first connecting rod pushes the second linkage end of the second connecting rod to tilt up, and the upper limit detection end of the second connecting rod swings inward toward the mandrel body, so that the mandrel body is inserted into the catheter.

[0028] When the actual inner diameter of the catheter matches its specified inner diameter, the first connecting rod is inserted into the catheter, and the upper limit detection end of the second connecting rod hooks onto the end of the catheter.

[0029] When the actual inner diameter of the catheter is larger than its specified inner diameter, the first and second connecting rods are directly inserted into the catheter.

[0030] Preferably, the upper limit detection end of the second link has a protruding limit part, making the second link hook-shaped.

[0031] Preferably, the lower limit detection end of the first link is arc-shaped.

[0032] A pipe bending device applies the above-mentioned pipe bending method.

[0033] The beneficial effects of the technical solution of the present invention are as follows: Through the above method, the dimensions of the conduit can be inspected before bending, thereby saving a lot of labor costs, subsequent inspection processes and inspection time. It can improve the quality of the bent pipe product, reduce the scrap rate, and reduce the production cost of enterprises. At the same time, the above method supports the inner wall of the conduit with thermally expanded support beads, so that the conduit is prevented from deforming during the processing, while ensuring sufficient clamping force to hold the conduit, thereby ensuring the stability of the bending process, improving the efficiency and success rate of bending, avoiding clamping marks on the outer wall of the conduit, and further improving the quality of the bent pipe product. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the pipe bending device;

[0035] Figure 2A schematic diagram of the connection structure between the mandrel bead and the mandrel body;

[0036] Figure 3 This is a schematic diagram of the first link;

[0037] Figure 4 This is a schematic diagram of the second link;

[0038] Figure 5 A schematic diagram of the connection structure of the conduit, clamping mold, and wheel mold base;

[0039] Figure 6 This is a schematic diagram of the clamping mold and the wheel mold base.

[0040] Reference numerals: 11, wheel mold base; 111, first clamping groove; 112, forming groove; 12, clamping mold; 121, second clamping groove; 21, mandrel body; 22, bolt; 23, connecting column; 24, mandrel bead; 241, connecting part; 242, positioning pin; 243, supporting part; 244, baffle; 25, steel wire rope; 26, support bead; 27, heating wire; 3, guide tube; 71, first connecting rod; 711, lower limit detection end; 712, first linkage end; 72, second connecting rod; 721, upper limit detection end; 722, second linkage end; 73, first spring; 74, second spring; 75, first hinge shaft; 76, second hinge shaft. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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. Example

[0046] A pipe bending method, applied as follows Figure 1 The illustrated pipe bending device includes a mandrel and a bending die for bending the conduit.

[0047] like Figure 1 and Figure 2 As shown, the mandrel includes a mandrel body 21 and a thermally expandable support bead 26. A heating wire 27 and a steel wire rope 25 are mounted on the support bead 26, and the support bead 26 is flexibly connected to the mandrel body 21 via the steel wire rope 25. The bending die device includes a frame, a rotating frame, a feeding mechanism, a guide die, a wheel die seat 11, and a clamping die 12. The feeding mechanism, guide die, and rotating frame are all mounted on the frame, with the guide die located between the feeding mechanism and the rotating frame. The wheel die seat 11 and the clamping die 12 are both mounted on the rotating frame. The wheel die seat 11 is fixedly mounted on the rotating frame, and the rotating frame rotates around the center line of the wheel die seat 11. The clamping die 12 is slidably mounted on the rotating frame. Figure 6As shown, the outer circumferential surface of the wheel mold base 11 is provided with an arc-shaped forming groove 112 and a straight first clamping groove 111, and the clamping mold 12 is provided with a straight second clamping groove 121. The first clamping groove 111 and the second clamping groove 121 are arranged facing each other; there are two guide molds, and the two guide molds are installed on the frame in a way that the spacing is adjustable.

[0048] The specific steps are as follows:

[0049] Step 1), insert the mandrel into the conduit 3, and then use the mandrel body 21 to check whether the inner diameter of the conduit 3 is qualified;

[0050] Step 2): When the inner diameter of the conduit 3 is not qualified, the conduit 3 is marked and placed in the designated area; when the inner diameter of the conduit 3 is qualified, the conduit 3 is installed on the feeding mechanism, and the feeding mechanism moves the conduit 3 so that the conduit 3 passes through the two guide molds and enters the first clamping groove 111 and the second clamping groove 121.

[0051] Step 3), the guide mold has clamped the outer wall of the conduit 3, so that the conduit 3 is in a straight state;

[0052] Step 4), pull out the core rod body 21, move the support bead 26 between the first clamping groove 111 and the second clamping groove 121, and then heat the support bead 26 to expand the support bead 26 to support the inside of the conduit 3.

[0053] Step 5), drive the clamping mold 12 to move closer to the wheel mold base 11 and clamp the guide tube 3;

[0054] Step 6), drive the rotating frame to rotate, the rotating frame drives the wheel mold base 11 and the clamping mold 12 to move, so that the guide tube 3 bends and gradually wraps around the forming groove 112 of the wheel mold base 11.

[0055] Step 7), after the conduit 3 is bent, the clamping mold 12 and the guide mold move away from the conduit 3, and the rotating frame drives the wheel mold seat 11 and the clamping mold 12 to rotate and reset.

[0056] Step 8): After the support bead 26 has cooled down, adjust the position of the guide tube 3 and repeat steps 3) to 7) until the bending of the guide tube 3 is completed.

[0057] With this setup, the dimensions of the conduit 3 can be inspected before bending, saving significant labor costs, subsequent inspection processes, and inspection time. This improves the quality of the bent pipe and reduces the scrap rate, thus lowering production costs. Furthermore, the thermally expanded support beads 26 support the inner wall of the conduit 3, preventing deformation during processing while ensuring sufficient clamping force. This guarantees stability during bending, increases efficiency and success rate, prevents clamping marks on the outer wall of the conduit 3, and further enhances the quality of the bent pipe.

[0058] In this embodiment, as Figure 1 and Figure 2 As shown, in step 2) above, the inner diameter of the catheter 3 is determined to be qualified by the positional relationship between the detection component and the end of the catheter 3. Specifically, the detection component includes a first connecting rod 71, a second connecting rod 72, and a reset component. The two ends of the first connecting rod 71 are the lower limit detection end 711 and the first linkage end 712, respectively. The two ends of the second connecting rod 72 are the upper limit detection end 721 and the second linkage end 722, respectively. Both the first connecting rod 71 and the second connecting rod 72 are hinged to the mandrel body 21. The reset component pushes the lower limit detection end 711 of the first connecting rod 71 and the upper limit detection end 721 of the second connecting rod 72 to tilt upwards. The second linkage end 722 of the second connecting rod 72 presses against the first linkage end 722 of the first connecting rod 71. On the linkage end 712; the accuracy of the inner diameter of the conduit 3 includes the upper limit deviation, the upper acceptable deviation, the lower acceptable deviation, and the lower limit deviation, which decrease in size sequentially; in the multiple sets of detection components, the vertices of multiple upper limit detection ends 721 are located on the same circumference, and the accuracy of this circumference is the upper limit accuracy circle, the size of which is between the upper limit deviation and the upper acceptable deviation; in the multiple sets of detection components, the vertices of multiple lower limit detection ends 711 are located on the same circumference, and the accuracy of this circumference is the lower limit accuracy circle, the size of which is between the lower acceptable deviation and the lower limit deviation.

[0059] In step 2) above, when the actual inner diameter of the conduit 3 is less than the lower limit of its specified inner diameter, the conduit 3 pushes the lower limit detection end 711 of the first connecting rod 71, causing the first linkage end 712 of the first connecting rod 71 to tilt up. The first linkage end 712 of the first connecting rod 71 pushes the second linkage end 722 of the second connecting rod 72 to tilt up, and the upper limit detection end 721 of the second connecting rod 72 swings inward toward the mandrel body 21, so that the mandrel body 21 is inserted into the conduit 3. When the actual inner diameter of the conduit 3 meets its specified inner diameter, the first connecting rod 71 is inserted into the conduit 3, and the upper limit detection end 721 of the second connecting rod 72 hooks onto the end of the conduit. When the actual inner diameter of the conduit 3 is greater than its specified inner diameter, the first connecting rod 71 and the second connecting rod 72 are directly inserted into the conduit 3.

[0060] With such a setting, there is only one way for the pipe fitting of the conduit 3 to be qualified, that is, the upper limit detection end 721 of the second connecting rod 72 hooks the end of the conduit 3; when the diameter of the conduit 3 is unqualified, the detection device can be inserted into the conduit 3; thus enabling the worker to easily and accurately judge whether the conduit 3 to be processed is qualified. By observing whether the second connecting rod 72 swings, it is possible to quickly judge whether the diameter of the conduit 3 is too large or too small, and then be able to more quickly distinguish the defects of the conduit 3, and then process the defective conduits 3 separately.

[0061] In this embodiment, as Figure 1 and Figure 2 shown, the resetting member includes a first spring 73 and a second spring 74. The first spring 73 is arranged between the first connecting rod 71 and the mandrel main body 21, and the first spring 73 pushes the lower limit detection end 711 of the first connecting rod 71 to tilt upwards; the second spring 74 is arranged between the second connecting rod 72 and the mandrel main body 21, and the second spring 74 pushes the upper limit detection end 721 of the second connecting rod 72 to tilt upwards.

[0062] Further preferably, the first spring 73 and the second spring 74 have the same specifications. With such a setting, since the connecting rod and the mandrel main body 21 can be precisely machined and controlled by machining, selecting springs of the same specification can ensure that the forces of each spring are as consistent as possible, and thus ensure the accuracy of detection.

[0063] In order to improve the detection accuracy, in this embodiment, as Figure 1 and Figure 2 shown, the mandrel main body 21 is provided with a plurality of accommodating grooves 212. The plurality of accommodating grooves 212 correspond to multiple groups of detection components one by one. The first spring 73 and the second spring 74 are arranged in the accommodating grooves 212, and the lower limit detection end 711 of the first connecting rod 71 and the upper limit detection end 721 of the second connecting rod 72 both extend out of the accommodating grooves 212. With such a setting, the outer diameter of the mandrel main body 21 can be made as close as possible to the inner diameter of the conduit 3, and thus ensure that the first connecting rod 71 is only used to detect the inner diameter of the conduit 3, improving the calibration accuracy of the inner diameter of the conduit 3.

[0064] In order to make the detection device more sensitive, in this embodiment, as Figure 3 shown, the lower limit detection end 711 of the first connecting rod 71 is arc-shaped, so that the part of the first connecting rod 71 protruding from the accommodating groove 212 is arc-shaped, and thus it is more sensitive when detecting the lower limit of the inner diameter of the conduit 3.

[0065] Further preferably, as Figure 4As shown, the upper limit detection end 721 of the second connecting rod 72 protrudes outward from the core rod body 21 with a limiting protrusion, making the second connecting rod 72 hook-shaped; when the inner diameter of the conduit 3 is qualified or too large, the limiting protrusion is in a vertical state; when the inner diameter of the conduit 3 is too small, the conduit wall of the conduit 3 squeezes the first connecting rod 71, the first connecting rod 71 pushes the second connecting rod 72 to swing, and the limiting protrusion is tilted.

[0066] To facilitate the fabrication of the detection device, in this embodiment, as follows: Figure 2-5 As shown, the first connecting rod 71 is hinged to the mandrel body 21 via the first hinge shaft 75, and the second connecting rod 72 is hinged to the mandrel body 21 via the second hinge shaft 76; the distance from the first hinge shaft 75 to the first linkage end 711 is greater than the distance from the second hinge shaft 76 to the second linkage end 721; on the second connecting rod 72, the distance from the second hinge shaft 76 to the second linkage end 722 is less than the distance from the second hinge shaft 75 to the upper limit detection end 721; on the first connecting rod 71, the distance from the first hinge shaft 75 to the first linkage end 712 is less than the distance from the first hinge shaft 75 to the lower limit detection end 711.

[0067] In this embodiment, the size of the lower limit precision circle and the upper limit precision circle are adjusted by grinding the lower limit detection end 711 of the first connecting rod 71 and the upper limit detection end 721 of the second connecting rod 72.

[0068] To improve the stability of the pipe bending process, in this embodiment, as follows: Figure 1 and Figure 2 As shown, there are multiple support beads 26, spaced apart and flexibly connected by steel wire ropes 25. This arrangement provides more support points for the conduit 3, ensuring the clamping mold 12 can apply sufficient clamping force. The spaced arrangement and flexible connection of the steel wire ropes 25 give the mandrel a certain degree of self-adaptive capacity, allowing for better matching of the pipe diameter. This facilitates the installation of each support bead 26, ensures the overall strength of the mandrel, and facilitates the pulling of the mandrel body. Furthermore, the high rigidity of the steel wire ropes 25 ensures the support beads 26 installed on them remain vertical, thus correcting their posture within the conduit 33 and unifying their orientation, thereby evenly supporting the inner wall of the conduit 33.

[0069] In a further preferred embodiment, two plugs are fixed on the wire rope 25, and the support bead 26 is located between the two plugs.

[0070] In a further preferred embodiment, the wire rope 25 passes through the center of the support beads 26, and multiple sleeves are fitted onto the wire rope 25. The sleeves are tightly fitted to the wire rope 25, and each sleeve corresponds one-to-one with a support bead 26. The support beads 26 are fitted onto the sleeves, and the sleeves pass through the inside of the support beads 26. The two ends of the sleeves are folded outwards to confine the support beads 26 to the sleeves. Furthermore, two plugs are also fixedly installed on the wire rope 25, and the multiple support beads 26 are all located between the two plugs.

[0071] To ensure uniform expansion of the support beads 26, in this embodiment, the steel wire rope 25 passes through the center of the support beads 26, and three heating wires 27 are arranged evenly around the steel wire rope 25. This arrangement allows the support beads 26 to be heated and expanded uniformly, thus providing uniform support to the inner wall of the conduit 33.

[0072] In this embodiment, the core rod also includes a plurality of core rod beads 24. The specific structure of the core rod beads 24 and their connection structure with the core rod body 21 can be found in the patent document with publication number CN109248945A. Simply put, the plurality of core rod beads 24 are arranged one by one and connected sequentially by ball heads. The core rod beads 24 located on both sides are connected to the core rod body 21 and the support beads 26 respectively. The support beads 26 are flexibly connected to the core rod beads 24 by steel wire rope 25. The core rod beads 24 are connected to the core rod body 21.

[0073] Specifically, such as Figure 1 and Figure 2 As shown, in order to achieve relative movement of the core bead 24, in this embodiment, the core bead 24 includes a support portion 243 and a connecting portion 241. The support portion 243 is sleeved and fixed on the connecting portion 241. Two adjacent core beads 24 are connected through their respective connecting portions 241. The support portion is in the shape of two lobes and is fixedly connected by a positioning pin 242.

[0074] Specifically, a limiting part protrudes from the outer peripheral surface of the connecting part 241, a limiting groove is formed on the outer peripheral surface of the connecting part 241, a baffle 244 is snapped onto the connecting part 241, a ball head protrudes from one end of the connecting part 241, a ball groove is formed at the other end of the connecting part 241, and a support part 243 is sleeved on the connecting part 241. The support part 243 is clamped by the baffle 244 and the limiting part.

[0075] When connecting two core beads, which are the first core bead and the second core bead, the first core bead is assembled first. Then, the ball head of the first core bead is clamped by the connecting part of the second core bead. The connecting part of the second core bead is then fixed into a whole by a positioning pin. Then, the supporting part of the second core bead is put on the connecting part of the second core bead. Finally, a baffle is put on the connecting part of the second core bead, thus connecting the first core bead and the second core bead together.

[0076] To facilitate the connection between the mandrel body and the mandrel bead, in this embodiment, the mandrel body 21 has a positioning groove and a connecting groove 211 at both ends, respectively. A through hole is provided between the positioning groove and the connecting groove 211. A connecting post 23 is inserted into the connecting groove 211. One end of the connecting post 23 has a ball groove, and the other end of the connecting post 23 has a threaded hole. A bolt 22 is inserted into the positioning groove, and the threaded part of the bolt passes through the through hole and is threadedly connected to the threaded hole of the connecting post. The ball head of the mandrel bead is inserted into the ball groove of the connecting post 23, so that the mandrel bead and the mandrel body 21 are connected.

[0077] Furthermore, such as Figure 2 and Figure 1 As shown, the connecting post 23 is bilobed. The two connecting posts 23 are joined together to clamp the ball head of the mandrel bead. Then the connecting post 23 is inserted into the connecting groove 211 of the mandrel body 21. The bolt is inserted into the positioning groove. The threaded part of the bolt passes through the through hole and is threadedly connected to the threaded hole of the connecting post.

[0078] The curved conduit includes a straight clamping portion and an arc-shaped curved portion; in step 4) above, the support bead 26 is located inside the clamping portion, and the support bead 26 and the mandrel bead 24 are located at both ends of the curved portion.

[0079] This design ensures that each part of each catheter 3 is supported, thereby improving the quality of the finished catheter 3.

[0080] 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.

[0081] 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 of bending a tube, characterized by: A bending device is applied, which comprises a mandrel and a bending die device for bending a pipe; The mandrel comprises a mandrel body (21), a plurality of detection assemblies for detecting the pipe diameter, and a support bead (26) capable of thermal expansion, the support bead (26) is provided with a heating wire (27) and a steel wire rope (25), and the support bead (26) is flexibly connected with the mandrel body (21) through the steel wire rope (25); The plurality of detection assemblies are uniformly arranged around the mandrel body (21); The bending die device comprises a rack, a rotating frame, a feeding mechanism, guide dies, a wheel die seat (11) and a die clamp (12), the guide dies are two, and the two guide dies are installed on the rack in an adjustable spacing manner; The feeding mechanism, the guide dies and the rotating frame are all installed on the rack, and the guide dies are located between the feeding mechanism and the rotating frame; the wheel die seat (11) and the die clamp (12) are both installed on the rotating frame; the wheel die seat (11) is fixedly installed on the rotating frame, the rotating frame rotates around the center line of the wheel die seat (11), and the die clamp (12) is slidably installed on the rotating frame; an arc-shaped forming groove (112) and a linear first clamping groove (111) are formed on the outer circumferential surface of the wheel die seat (11), a linear second clamping groove (121) is formed on the die clamp (12), and the first clamping groove (111) and the second clamping groove (121) are arranged face to face; The specific steps are as follows: Step 1), the mandrel is inserted into the pipe (3), and then the detection assembly is used to detect whether the inner diameter of the pipe (3) is qualified; Step 2), when the inner diameter of the pipe (3) is unqualified, the pipe (3) is marked and placed in a designated area; when the inner diameter of the pipe (3) is qualified, the pipe (3) is installed on the feeding mechanism, the feeding mechanism moves the pipe (3), so that the pipe (3) passes between the two guide dies and then enters between the first clamping groove (111) and the second clamping groove (121); Step 3), the guide dies have clamped the outer wall of the pipe (3), so that the pipe (3) is in a flat state; Step 4), the mandrel body (21) is pulled out, the support bead (26) is moved to between the first clamping groove (111) and the second clamping groove (121), and then the support bead (26) is heated, so that the support bead (26) is expanded to support the inside of the pipe (3); Step 5), the die clamp (12) is driven to move close to the wheel die seat (11) and clamp the pipe (3); Step 6), the rotating frame is driven to rotate, the rotating frame drives the wheel die seat (11) and the die clamp (12) to move, so that the pipe (3) is bent and gradually wound on the forming groove (112) of the wheel die seat (11); Step 7), after the pipe (3) is bent, the die clamp (12) and the guide dies move away from the pipe (3), and the rotating frame drives the wheel die seat (11) and the die clamp (12) to rotate back to the original position; Step 8), after the support bead (26) is cooled, the position of the pipe (3) is adjusted, and the above steps 3) to 7) are repeated until the pipe (3) is completely bent; The detection assembly comprises a first connecting rod (71), a second connecting rod (72) and a reset member, two ends of the first connecting rod (71) are a lower limit detection end (711) and a first linkage end (712) respectively, and two ends of the second connecting rod (72) are an upper limit detection end (721) and a second linkage end (722) respectively. The first connecting rod (71) and the second connecting rod (72) are both hinged on the mandrel body (21), the lower limit detection end (711) of the first connecting rod (71) and the upper limit detection end (721) of the second connecting rod (72) are respectively pushed up by the reset member, and the second linkage end (722) of the second connecting rod (72) is pressed on the first linkage end (712) of the first connecting rod (71). In the step 2), whether the inner diameter of the conduit (3) is qualified is determined by the position relationship between the detection assembly and the end of the conduit (3); when the actual inner diameter of the conduit (3) is smaller than the specified inner diameter, the lower limit detection end (711) of the first connecting rod (71) is pushed by the conduit (3), the first linkage end (712) of the first connecting rod (71) is pushed up, the second linkage end (722) of the second connecting rod (72) is pushed up by the first linkage end (712) of the first connecting rod (71), and the upper limit detection end (721) of the second connecting rod (72) swings to the inside of the mandrel body (21), so that the mandrel body (21) is inserted into the conduit (3); when the actual inner diameter of the conduit (3) meets the specified inner diameter, the first connecting rod (71) is inserted into the conduit (3), and the upper limit detection end (721) of the second connecting rod (72) hooks the end of the conduit (3); when the actual inner diameter of the conduit (3) is greater than the specified inner diameter, the first connecting rod (71) and the second connecting rod (72) are directly inserted into the conduit (3).

2. A method of bending a tube according to claim 1, characterised in that: The plurality of support beads (26) are arranged at intervals, and the plurality of support beads (26) are flexibly connected by the steel wire rope (25).

3. A method of bending a tube according to claim 1, characterised in that: The plurality of heating wires (27) are uniformly arranged on the support beads (26).

4. A method of bending a tube according to claim 1, characterized in that: The steel wire rope (25) and the support beads (26) are tightly matched.

5. A method of bending a tube according to claim 1, characterized in that: The steel wire rope (25) passes through the central position of the support bead (26).

6. A method of bending a tube according to claim 1, characterized in that: The upper limit detection end (721) of the second connecting rod (72) is provided with a limiting portion, so that the second connecting rod (72) is hook-shaped.

7. A method of bending a tube according to claim 1, wherein: The lower limit detection end (711) of the first connecting rod (71) is arc-shaped.

8. A pipe bending device applying the pipe bending method of any one of claims 1-7.

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