Corrugated pipe, and production apparatus and method therefor
By spirally winding thin metal sheets to form a multi-layer interlocking structure, the problem of insufficient connection strength and sealing at the joints of metal corrugated pipes is solved, achieving efficient production and improved weather resistance.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ZHEJIANG LI SHENG PHOTOELECTRIC TECH CO LTD
- Filing Date
- 2025-12-19
- Publication Date
- 2026-07-23
AI Technical Summary
How to improve the connection strength and sealing performance of the joints while ensuring the adaptability and production efficiency of metal corrugated pipes?
A multi-layer interlocking structure is formed by continuously spirally winding thin metal sheets. The corrugated ribs have relative peaks and troughs. The side edges are turned up and interlocked to form a multi-layer interlocking structure. Reinforcing members can be selected to enhance the connection. Continuous production is achieved using production equipment with corrugated rollers, turning rollers, interlocking rollers and winding rollers.
It improves the connection strength and sealing of the seams, enhances weather resistance, adapts to continuous production, and balances product performance and production efficiency.
Smart Images
Figure CN2025143737_23072026_PF_FP_ABST
Abstract
Description
Corrugated pipes, corrugated pipe production equipment and their production methods Technical Field
[0001] This application relates to the field of pipe forming technology, and in particular to a corrugated pipe, corrugated pipe production equipment, and production method thereof. Background Technology
[0002] With the development of modern industry, the application range of corrugated pipes is becoming increasingly wider, and they can be used for conveying fluids and powdered solids, exchanging heat energy, and manufacturing mechanical parts and containers. Among them, metal corrugated pipes are increasingly favored by the market due to their excellent weather resistance and convenient production performance.
[0003] Currently, large-diameter corrugated metal pipes are typically produced by extruding long strips of metal sheet using a mold to create corrugations, which are then further coiled and spirally wound to form a continuous pipe body. Consequently, during use, the tensile deformation of the corrugated pipe negatively impacts the joints, making the metal sheet prone to detachment at these points and causing structural damage to the pipe. Those skilled in the art have attempted to improve the joint strength using adhesives; however, the weather resistance and safety of adhesives limit the pipe's application scenarios, such as high-temperature pipelines or pipelines in direct contact with drinking water or food. Technical issues
[0004] Improving the connection strength and sealing performance of the joints while ensuring the adaptability and production efficiency of metal corrugated pipes has become an urgent problem to be solved. Technical solutions
[0005] To solve the above-mentioned technical problems, this application discloses a corrugated pipe, which is formed by spirally winding a continuous metal sheet and has multiple spirally arranged corrugated ribs. Each corrugated rib has a relative crest and a trough. The metal sheet extends into a long strip in the length direction and has a relative first side edge and a relative second side edge in the width direction. The first side edge located in the upper spiral and the second side edge located in the lower spiral are connected to each other to form a continuous tubular structure. The metal sheet has a relative front and a back.
[0006] The first side edge has an inwardly turned first flange, and a first fastening gap is formed between the first flange and the front side. The corresponding second side edge has an inwardly turned second flange, and a second fastening gap is formed between the second flange and the back side. The first flange is inserted into the second fastening gap, and the second flange is inserted into the first fastening gap. The first flange and the second flange overlap each other to form a fastening structure with multiple layers of thin metal plates in thickness. At least one corrugated rib is formed in the area where the fastening structure is located.
[0007] In one embodiment, in the fastening structure, an adhesive is provided between at least two adjacent metal sheets.
[0008] In one embodiment, a first corrugated rib is formed in the main body area of the metal sheet, and a second corrugated rib is formed in the area where the fastening structure is located, with the first and second corrugated ribs arranged continuously.
[0009] In one embodiment, a corrugated rib is formed in the area where the fastening structure is located, and the starting point of the fastening structure is located at the two troughs of the corrugated rib.
[0010] In one embodiment, the bellows further includes a reinforcing member passing through the fastening structure, the reinforcing member extending spirally along the fastening structure on the bellows.
[0011] In one embodiment, the reinforcement is located near the crest of one of the corrugated ribs.
[0012] This application also discloses a corrugated pipe manufacturing apparatus, comprising:
[0013] Several corrugated rollers arranged opposite each other are used to form several first corrugated ribs on a thin metal sheet;
[0014] A plurality of opposing flanging rollers are used to fold the first side edge of the metal sheet to form a first flanging extending in the height direction, and to fold the second side edge of the metal sheet to form a second flanging extending in the height direction, wherein the first flanging and the second flanging are arranged opposite to each other;
[0015] Oppositely arranged winding rollers bend and spirally convey the metal sheet, causing the first flange of the upper spiral and the second flange of the next spiral to be misaligned and fit together.
[0016] The opposing fastening rollers are used to bend the first flange toward the front to form a first fastening gap, and to fold the second flange toward the back to form a second fastening gap, thereby forming a fastening structure and pressing the fastening structure to form a second corrugated rib.
[0017] In one embodiment, the corrugated rollers are provided in multiple sets in the conveying direction of the metal sheet, and each set forms a first corrugated rib on the metal sheet.
[0018] In one embodiment, the fastening rollers arranged opposite each other include:
[0019] The clearance section conveys and holds the first corrugated rib;
[0020] The interlocking section is used to form the second corrugated rib;
[0021] The engagement distance between the engagement sections is greater than the engagement distance between the avoidance sections.
[0022] In one embodiment, the fastening roller includes a first roller body disposed inside the corrugated tube formed by the winding roller and a second roller body disposed outside the corrugated tube formed by the winding roller, wherein the first roller body is disposed separately.
[0023] This application also discloses a method for producing a bellows, including:
[0024] Step S100: Convey a straight and strip-shaped metal sheet, and process the first corrugated rib on the metal sheet in multiple steps;
[0025] Step S200: Fold the first side edge of the metal sheet to obtain a first flange extending in the height direction, and fold the second side edge to obtain a second flange extending in the height direction;
[0026] Step S300: The metal sheet is bent and spirally conveyed to form a continuous corrugated pipe;
[0027] In step S400, the first flange is bent toward the front to form a first fastening gap, and the second flange is folded toward the back to form a second fastening gap, forming a fastening structure and pressing the fastening structure to form a second corrugated rib. Beneficial effects
[0028] The technical solution disclosed in this application forms a multi-layer metal sheet interlocking structure and sets corrugated ribs at the interlocking structure to effectively improve the connection strength and sealing of the joint. At the same time, the setting of the flange and corrugated ribs can well adapt to continuous production, taking into account product performance, adaptability and production efficiency. Attached Figure Description
[0029] Figure 1 is a schematic diagram of a bellows structure in one embodiment of this application;
[0030] Figure 2 is a schematic diagram of the unfolded state of the metal sheet;
[0031] Figure 3 is a schematic diagram of the fastening structure before processing the corrugated ribs;
[0032] Figure 4 is a schematic diagram of the fit after the corrugated ribs are processed into the snap-fit structure;
[0033] Figure 5 is a schematic diagram of the fastening structure in Figure 4 with reinforcement components.
[0034] Figure 6 is a schematic diagram of a corrugated pipe production equipment in one embodiment of this application;
[0035] Figure 7 is a schematic diagram of the snap-fit roller structure in one embodiment;
[0036] Figure 8 is a partially enlarged schematic diagram of the corrugated pipe production equipment;
[0037] Figure 9 is a schematic diagram of the first flange, the second flange, and the guide block in action;
[0038] Figure 10 is a schematic diagram of the first and second flanges being pressed together as shown in Figure 9.
[0039] The annotations in the figure are explained as follows:
[0040] 100. Metal sheet; 110. First side edge; 111. First flange; 120. Second side edge; 121. Second flange;
[0041] 200. Corrugated rib; 201. Crest; 202. Trough; 203. Transition section;
[0042] 300. Snap-fit structure;
[0043] 400. Reinforcing components;
[0044] 500. Corrugated roller;
[0045] 600. Flanging roller; 610. Guide block; 611. Guide slope;
[0046] 700, Snapping roller; 710, Clearance section; 720, Snapping section; 721, Snapping rib; 730, First roller body; 731, Middle section; 732, Upper section; 733, Lower section; 740, Second roller body;
[0047] 800. Winding roller; 810. Holding roller;
[0048] 900. Pipe body. Embodiments of the present invention
[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0050] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component.
[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0052] As shown in Figure 1, one embodiment of this application discloses a corrugated pipe, which is formed by spirally winding a continuous metal sheet 100 and has multiple spirally arranged corrugated ribs 200 on the pipe wall. The corrugated ribs 200 are arranged at intervals or continuously on the pipe wall to form corrugated folds, allowing the corrugated pipe to extend or bend in the length direction to adapt to different installation requirements. The pitch of the spiral winding of the metal sheet 100 is the same as the pitch of the spiral extension of the corrugated ribs 200. That is, as shown in Figure 2, when the metal sheet 100 is laid out, the corrugated ribs 200 extend along the length direction of the metal sheet 100 and are multiple parallel lines. Generally speaking, the corrugated ribs 200 are continuously arranged along the width direction of the metal sheet 100 to form a corrugated structure.
[0053] The metal sheet 100 itself can be a single-layer plate made of metal material, or a multi-layer structure with a film coating on the surface of the metal material. The coating material can be metal material, polymer material, or flocking to prevent heat conduction, for example, to prevent burns or to keep warm.
[0054] As shown in Figure 2, the metal sheet 100 extends into a strip shape in the length direction and has opposing first side edges 110 and second side edges 120 in the width direction. Generally, after the metal sheet 100 is spirally wound, the first side edge 110 located in the previous spiral and the second side edge 120 located in the next spiral are connected to each other to form a continuous tubular structure.
[0055] In this embodiment, as shown in FIG3, the first side edge 110 has an inwardly turned first flange 111, and a first fastening gap is formed between the first flange 111 and the front side. The corresponding second side edge 120 has an inwardly turned second flange 121, and a second fastening gap is formed between the second flange 121 and the back side. The first flange 111 is inserted into the second fastening gap, and the second flange 121 is inserted into the first fastening gap. The first flange 111 and the second flange 121 are stacked on each other to form a fastening structure 300 with multiple layers of metal sheets 100 in thickness.
[0056] From the perspective of structural strength, the first flange 111 and the second flange 121 are preferably completely overlapping, that is, the inner boundary of the first flange 111 and the outer boundary of the second flange 121 coincide, and the outer boundary of the first flange 111 and the inner boundary of the second flange 121 coincide. This structure can completely fill the fastening gap to increase the tensile strength of the connection.
[0057] To improve the sealing performance of the fastening structure 300, in some embodiments, as shown in Figure 4, a corrugated rib 200 is formed in the area where the fastening structure 300 is located. This single corrugated rib 200 covers the entire fastening structure 300, and the axial length of the fastening structure 300 can be less than the extension length of the corrugated rib 200. Obviously, there can be multiple corrugated ribs 200, meaning the axial length of the fastening structure is greater than the extension length of a single corrugated rib 200. This design can further improve its sealing performance, but it also correspondingly increases its processing difficulty.
[0058] In addition to the corrugated ribs 200 located in the fastening structure 300, a plurality of corrugated ribs 200 are arranged parallel to each other between the first side edge 110 and the second side edge 120. In this embodiment, 1 to 10 corrugated ribs 200 are provided between the first side edge 110 and the second side edge 120, and the corrugated ribs 200 are arranged continuously between each other. In this embodiment, the corrugated ribs 200, the first flange 111, and the second flange 121 are all formed by bending the metal sheet 100 itself and are an integral structure.
[0059] The corrugated ribs 200 formed by the interlocking structure 300 with multiple layers of thin metal sheets effectively improve the connection strength and sealing of the joint, preventing leakage or tearing at the joint when the corrugated pipe is under stress. Compared with the existing technology that seals the joint with adhesive, the corrugated pipe in this application has better weather resistance and is more suitable for continuous production, balancing product performance and production efficiency.
[0060] For details regarding the setting of the fastening structure 300, please refer to the embodiments shown in Figures 3 and 4. The first flange 111 and the second flange 121 both form fastening gaps and each enters the fastening gap of the other. The fastening structure 300 has four layers of thin metal plates 100 in terms of thickness.
[0061] Each folded edge marks the start and end points of the interlocking structure 300, conforming to the undulating trend of the corrugated rib 200. In Figures 3 and 4, the thickness of each metal sheet is exaggerated to more clearly illustrate the fit. In actual products, the thickness of the metal sheets is negligible compared to the size of the corrugated rib, and the entire interlocking structure, with the production equipment described below, will not significantly affect the size of the corrugated rib.
[0062] The corrugated rib 200 is formed by the upward bulge of the metal sheet 100. The distance H1 from the bulge of the corrugated rib 200 relative to the plane of the metal sheet 100 is the height of the corrugated rib 200. In the splicing direction of the metal sheet 100, the extension length L1 of the corrugated rib 200 is the width of the corrugated rib 200. As shown in Figure 4, in the splicing direction of the metal sheet 100, the extension length L2 of the interlocking structure 300 is basically equal to the extension length L1 of the corrugated rib 200. That is to say, the starting point and the ending point of the interlocking structure 300 are located at the two troughs 202 of the corrugated rib 200, respectively.
[0063] Referring to the embodiment shown in Figure 5, the corrugated pipe further includes a reinforcing member 400 passing through the fastening structure 300. The reinforcing member 400 extends spirally along the fastening structure 300 on the corrugated pipe, and in cross-section, the reinforcing member 400 is located near the crest 201 of one of the corrugated ribs 200. The cross-sectional shape of the reinforcing member can be circular, flat, or other structures.
[0064] In this embodiment, the reinforcing member 400 is a reinforcing rope, which can be a single strand or woven from multiple reinforcing filaments. The material can be metal, polymer, or a mixture of both. In the multi-layered structure of the fastening structure 300, the reinforcing rope can be located between any two layers. The reinforcing rope can be a single strand or multiple strands; when multiple strands are used, different reinforcing ropes can be located between different layers of the fastening structure 300. Generally, the reinforcing member 400 uses round, thin steel wire, combining rigidity and elasticity.
[0065] The fastening structure 300 can further enhance the connection effect with an adhesive. For example, an adhesive can be provided in the first and second fastening gaps. The adhesive can be applied to the first flange 111 and the second flange 121 and held within the corresponding fastening gap as each flange folds. When the first flange 111 and the second flange 121 enter the corresponding fastening gap, they interact with the adhesive and maintain a sealed connection. In one embodiment, the adhesive is only located within the fastening gaps and is isolated from the internal space of the pipe to avoid being affected by the medium transported inside the pipe. The isolation of the adhesive can be achieved by the mutual contact and fastening of the flanges in the fastening structure 300. For example, a sealing bend is provided in the part of the fastening structure 300 adjacent to the adhesive.
[0066] Referring to the embodiments shown in Figures 6 to 10, this application also discloses a corrugated pipe production equipment for producing the corrugated pipes described in this application. For a more concise description, at least a portion of the corrugated ribs located on the interlocking structure 300 will be referred to as second corrugated ribs, and the remaining corrugated ribs will be referred to as first corrugated ribs. The corrugated pipe production equipment includes a plurality of opposing corrugated rollers 500, a plurality of opposing flanging rollers 600, opposing interlocking rollers 700, and opposing winding rollers 800. These rollers are arranged in pairs on the inner and outer sides of the metal sheet, causing corresponding deformation of the metal sheet at specific locations.
[0067] The corrugated roller 500 is used to form a plurality of first corrugated ribs on the metal sheet 100, the first corrugated ribs being located between the first side edge 110 and the second side edge 120. In some embodiments, the corrugated roller 500 may be provided in multiple groups, for example, as shown in Figure 6, the corrugated roller 500 is provided in multiple groups in the conveying direction of the metal sheet 100 and each forms a first corrugated rib on the metal sheet 100, the multiple first corrugated ribs being formed by different groups of corrugated rollers 500, wherein each corrugated rib 200 may be formed independently by one group of corrugated rollers 500 or formed by multiple groups of corrugated rollers 500 in combination. The downstream corrugated roller 500 is provided with a clearance groove to avoid the first corrugated ribs formed by the upstream corrugated roller 500. The form of independent processing of each first corrugated rib can improve the processing accuracy and ensure the processing dimensions of each first corrugated rib.
[0068] The flanging roller 600 is used to fold the first side edge 110 of the metal sheet 100 to form a first flange 111 extending in the height direction, and to fold the second side edge 120 of the metal sheet 100 to form a second flange 121 extending in the height direction. The first flange 111 and the second flange 121 are arranged opposite to each other, i.e., facing different directions, as shown in Figure 2.
[0069] Multiple sets of flanging rollers 600 can be provided, with multiple sets of flanging rollers 600 processing the same flanging position and gradually processing the flanging to a preset size, as shown in Figure 8. The first flanging 111 and the second flanging 121 can be processed simultaneously by the same set of flanging rollers 600, or they can be processed in stages by different sets of flanging rollers 600.
[0070] The winding roller 800 bends and spirally conveys the metal sheet 100 to form a tubular structure. In this state, the first flange 111 of the upper spiral and the second flange 121 of the lower spiral are naturally misaligned and fitted together. As shown in Figure 9, the lower spiral is located to the left of the upper spiral, and the second flange 121 is located to the right of the first flange. The two flanges that are in contact first enter the guide block 610. A pressing device is provided on the opposite side of the guide block 610, so that the two flanges can be tilted by the guide slope 611 of the guide block 610, so that they can smoothly enter the fastening roller pair.
[0071] The fastening roller 700 bends the first flange 111 toward the front to form a first fastening gap, and folds the second flange 121 toward the back to form a second fastening gap. The first flange 111 and the second flange 121 are inserted into each other and fastened to form a fastening structure 300. The fastening structure 300 is then pressed to form a second corrugated rib.
[0072] The engagement of the first flange 111 and the second flange 121 and the formation of the second corrugated rib by the engagement structure 300 can be achieved in steps. For example, the engagement structure 300 shown in Figure 3 can be formed first, and then the second corrugated rib shown in Figure 4 can be formed. Alternatively, the two structures can be formed simultaneously by the engagement roller 700.
[0073] Each snap-fit roller 700 includes a clearance section 710 and a snap-fit section 720. The clearance section 710 is used to convey and hold the first corrugated rib; the snap-fit section 720 is used to make the two flanges lie flat to form a snap-fit structure and to form corrugated ribs at the snap-fit structure.
[0074] The engagement distance between the interlocking sections 720 is greater than the engagement distance between the clearance sections 710. The second corrugated rib is located at the location of the interlocking structure 300. Compared with the first corrugated rib, the second corrugated rib has more metal sheet 100 layers. By adjusting the engagement distance between the interlocking sections 720, the interlocking effect can be better guaranteed.
[0075] Referring further to the embodiment shown in Figure 7, the engaging roller 700 includes a first roller body 730 disposed inside the tube body 900 of the corrugated tube formed by the winding roller 800 and a second roller body 740 located outside the tube body 900 of the corrugated tube formed by the winding roller 800. The first roller body 730 is separately disposed to allow for more flexible adjustment of the mating parameters between the first roller body 730 and the second roller body 740, thereby enabling flexible processing, such as whether or not the reinforcing member 400 is provided.
[0076] In some embodiments, the first roller body 730 includes a middle portion 731, an upper portion 732, and a lower portion 733, which abut against each other in sequence and are locked in place by pins passing through them. A snap-fit rib 721 for forming the corrugated rib 200 at the snap-fit structure 300 is separately disposed on the upper portion 732 and the middle portion 731; that is, a portion of the snap-fit rib 721 is located on the middle portion 731, and the remaining portion is located on the upper portion 732. When the middle portion 731 and the upper portion 732 are assembled together, the two portions are joined together to form a complete snap-fit rib 721. This arrangement allows for further fine-tuning of the dimensional parameters of the snap-fit rib 721, thereby enabling precise control over the processing details of the corrugated rib 200.
[0077] The winding roller 800 is located downstream of and adjacent to the snap-fit roller 700. The corrugated pipe production equipment also includes a retaining roller 810 on the outer circumferential surface of the corrugated pipe body 900. The retaining roller 810 cooperates with the outer circumferential surface of the pipe body 900 and maintains the spatial position of the pipe body 900 relative to the production equipment to achieve stable continuous production. Multiple retaining rollers 810 are provided and arranged around the pipe body 900. The retaining roller 810 is provided with clearance grooves to accommodate each corrugated rib.
[0078] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.
[0079] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.
Claims
1. A corrugated pipe, formed by continuously spirally winding a thin metal sheet and having multiple spirally arranged corrugated ribs on the pipe wall, characterized in that, The metal sheet extends into a long strip in the length direction and has opposing first and second side edges in the width direction. The first side edge located on the upper spiral and the second side edge located on the lower spiral are connected to each other to form a continuous tubular structure. The metal sheet has opposing front and back sides. The first side edge has an inwardly turned first flange, and a first fastening gap is formed between the first flange and the front side. The corresponding second side edge has an inwardly turned second flange, and a second fastening gap is formed between the second flange and the back side. The first flange is inserted into the second fastening gap, and the second flange is inserted into the first fastening gap. The first flange and the second flange overlap each other to form a fastening structure with multiple layers of thin metal plates in thickness. At least one corrugated rib is formed in the area where the fastening structure is located.
2. The corrugated pipe according to claim 1, characterized in that, In the fastening structure, an adhesive is provided between at least two adjacent metal sheets.
3. The corrugated pipe according to claim 1, characterized in that, The main body area of the metal sheet forms a first corrugated rib, and the area where the fastening structure is located forms a second corrugated rib. The first corrugated rib and the second corrugated rib are arranged continuously.
4. The corrugated pipe according to claim 1, characterized in that, The area where the fastening structure is located forms a corrugated rib, and the starting point of the fastening structure is located at the two troughs of the corrugated rib.
5. The corrugated pipe according to claim 1, characterized in that, The corrugated pipe also includes a reinforcing member inserted within the fastening structure, the reinforcing member extending spirally along the fastening structure on the corrugated pipe.
6. The corrugated pipe according to claim 5, characterized in that, The reinforcing member is located near the crest of one of the corrugated ribs.
7. A corrugated pipe production equipment, characterized in that, include: Several corrugated rollers arranged opposite each other are used to form several first corrugated ribs on a thin metal sheet; A plurality of opposing flanging rollers are used to fold the first side edge of the metal sheet to form a first flanging extending in the height direction, and to fold the second side edge of the metal sheet to form a second flanging extending in the height direction, wherein the first flanging and the second flanging are arranged opposite to each other; Oppositely arranged winding rollers bend and spirally convey the metal sheet, causing the first flange of the upper spiral and the second flange of the next spiral to be misaligned and fit together. The opposing fastening rollers are used to bend the first flange toward the front to form a first fastening gap, and to fold the second flange toward the back to form a second fastening gap, thereby forming a fastening structure and pressing the fastening structure to form a second corrugated rib.
8. The corrugated pipe production equipment according to claim 7, characterized in that, The corrugated rollers are provided in multiple sets in the conveying direction of the metal sheet, and each set forms a first corrugated rib on the metal sheet.
9. The corrugated pipe production equipment according to claim 7, characterized in that, The fastening rollers arranged in opposite directions each include: The clearance section conveys and holds the first corrugated rib; The interlocking section is used to form the second corrugated rib; The engagement distance between the engagement sections is greater than the engagement distance between the avoidance sections.
10. The corrugated pipe production equipment according to claim 9, characterized in that, The fastening roller includes a first roller body disposed inside the corrugated tube formed by the winding roller and a second roller body disposed outside the corrugated tube formed by the winding roller, wherein the first roller body is disposed separately.
11. A method for producing a corrugated pipe, characterized in that, include: Step S100: Convey a straight and strip-shaped metal sheet, and process the first corrugated rib on the metal sheet in multiple steps; Step S200: Fold the first side edge of the metal sheet to obtain a first flange extending in the height direction, and fold the second side edge to obtain a second flange extending in the height direction; Step S300: The metal sheet is bent and spirally conveyed, so that the first flange of the previous spiral and the second flange of the next spiral are misaligned and fitted together; In step S400, the first flange is bent toward the front to form a first fastening gap, and the second flange is folded toward the back to form a second fastening gap, forming a fastening structure and pressing the fastening structure to form a second corrugated rib.