Joint line co-extrusion reinforced double-wall corrugated pipe
By setting up a reinforcement layer and reinforcement ribs at the mold clamping joint of the double-wall corrugated pipe, the problem of stress concentration and ring flexibility in the mold clamping joint is solved, and the improvement of strength and ring flexibility is achieved.
Patent Information
- Application Number
- CN202411580797.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-03-07
AI Technical Summary
Existing double-walled corrugated pipes are prone to stress concentration at the mold clamping joints, resulting in shrinkage marks and ring flexibility not meeting standards.
By providing a reinforcement layer at the mold clamping joint of the bellows body, the reinforcement layer completely wraps the bearing port and provides multiple inclined reinforcement ribs at the connection position to increase the wall thickness and strength of the pipe.
It enhances the strength at the mold clamping point, improves the product appearance, and improves the ring flexibility and breaking strength of the pipe.
Smart Images
Figure CN119572832A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of corrugated pipes, and more particularly to a die line co-extruded reinforced double-wall corrugated pipe. Background Art
[0002] PE double-wall corrugated pipe is a plastic structural wall pipe made of polyethylene as raw material, processed by extrusion and special molding process. It has a smooth inner wall and a closed corrugated outer wall.
[0003] PE double-wall corrugated pipe is plasticized and extruded by a plastic extruder, and then formed into double-wall corrugated pipe by a set of circular moving forming modules. When forming PE corrugated pipe, the upper and lower modules are combined into a circular cavity, and the pipe blank is inflated.
[0004] At present, the existing double-wall corrugated pipe is prone to stress concentration at the mold seam of the upper and lower modules. After the pipe is formed and cooled, a more obvious shrinkage mark will appear at the mold seam of the outer wall of the pipe, affecting the appearance of the product. At the location of the shrinkage mark, the wall thickness at the wave crest of the pipe will be lower than that of other parts of the pipe. The ring rigidity performance does not meet the standard.
[0005] During processing, two semicircular modules are combined at the forming position to form a circular cavity with circumferential corrugations to meet the requirements of tube forming. Due to the influence of processing accuracy and the wear of the positioning pins used to position the modules relative to each other, the upper and lower modules cannot always form a regular circle after being combined, that is, there will be a certain misalignment between the modules, which will eventually be reflected in the formed tube. There will be not only shrinkage marks on the mold seam of the outer wall of the tube, but also irregular shapes that are staggered from each other.
[0006] The shrinkage marks and irregular shapes caused by the misalignment of the molded pipe not only affect the appearance of the pipe, but also have an adverse effect on the ring flexibility of the pipe. When testing the ring flexibility of the pipe, the pipe's mold seam is placed in a horizontal direction to test the ring flexibility index. The ring flexibility of the mold seam is inferior to that of other positions of the pipe.
[0007] Therefore, how to provide a die line co-extruded reinforced double-wall corrugated pipe that enhances the strength of the die joint and improves the annular flexibility of the die joint of the outer wall of the pipe is an urgent problem to be solved by technical personnel in this field. Summary of the invention
[0008] In view of this, the present invention provides a die line co-extruded reinforced double-wall corrugated pipe, which aims to solve one of the problems in the above-mentioned background technology, enhance the strength of the die joint, and improve the ring flexibility of the die joint of the outer wall of the pipe.
[0009] In order to achieve the above object, the present invention adopts the following technical solution:
[0010] A die line co-extruded reinforced double-wall corrugated pipe, comprising:
[0011] A bellows body, one end of the bellows body is set as a socket, the other end of the bellows body is set as a plug, a reinforcing layer is set at the outer side of the outer wall of the bellows at the die seam, the reinforcing layer is set as a sleeve, the reinforcing layer completely wraps the bellows, the inner diameter of the reinforcing layer is larger than the inner diameter of the bellows body, a plurality of reinforcing ribs are set at the connection position between the reinforcing layer and the bellows body, and the plurality of reinforcing ribs are all inclined;
[0012] A corrugated ring, wherein a plurality of the corrugated rings are arranged evenly spaced on the outer surface of the bellows body.
[0013] Furthermore, the inner wall of the bellows body is provided with a support layer, and the support layer is arranged in the middle position of the bellows body.
[0014] Furthermore, the supporting layer includes a connecting layer and a gradient layer, the inner diameter of the connecting layer is smaller than the inner diameter of the inner wall of the corrugated pipe body, two gradient layers are provided, the two gradient layers are connected to both ends of the connecting layer, the inner diameter of the gradient layer at one end away from the connecting layer is the same as the inner diameter of the inner wall of the corrugated pipe body, the inner diameter of the gradient layer gradually decreases from one end away from the connecting layer to the other end, and the inner diameter of the other end of the gradient layer is the same as the inner diameter of the connecting layer.
[0015] Furthermore, the reinforcement layer is configured as an axial protrusion reinforcement layer, and the axial protrusion reinforcement layer is configured as a plurality of axial protrusions uniformly distributed on the socket in a circumference, the axial protrusions completely wrap the socket, and both ends of each axial protrusion are configured as round heads.
[0016] Furthermore, an axial marking line is provided on the inner wall of the bellows body, and a plurality of the axial marking lines are provided. The plurality of the axial marking lines are evenly distributed on the inner wall of the bellows body in a circular shape, and the plurality of the axial protrusions are symmetrically arranged along the axial line.
[0017] Furthermore, the reinforcement layer is configured as a thread reinforcement layer, the thread reinforcement layer completely wraps the socket, and the inner diameter of the thread of the thread reinforcement layer is the same as the inner diameter of the corrugated ring.
[0018] Furthermore, the material of the reinforcement layer is set to be a special material for PE100 pipes, and a modified material EVA resin is added to the reinforcement layer.
[0019] It can be seen from the above technical scheme that compared with the prior art, the present invention discloses a co-extruded reinforced double-wall corrugated pipe at the die line. By setting a reinforcing layer, the wall thickness of the corrugated pipe body at the die seam can be increased, and the strength of the corrugated pipe body at the die seam can be improved; when shrinkage marks are generated at the die seam of the corrugated pipe body, the reinforcing layer also plays a covering role, thereby improving the appearance of the product; by setting reinforcing ribs, the connection strength between the corrugated pipe body and the reinforcing layer is improved, the breaking strength and breaking elongation of the corrugated pipe body are improved, and the annular flexibility of the corrugated pipe body at the die seam is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0021] Figure 1 This is a schematic diagram of the structure of the die line co-extruded reinforced double-wall corrugated pipe provided by the present invention (the reinforcement layer is a sleeve);
[0022] Figure 2 A schematic diagram of the structure of the die line co-extruded reinforced double-wall corrugated pipe provided by the present invention (the reinforcement layer is an axially raised reinforcement layer);
[0023] Figure 3 This is a schematic diagram of the structure of the die line co-extruded reinforced double-wall corrugated pipe provided by the present invention (the reinforcement layer is a thread reinforcement layer);
[0024] Figure 4 A schematic diagram of the internal structure of the die line co-extruded reinforced double-wall corrugated pipe provided by the present invention;
[0025] Figure 5 An axial cross-sectional view of the die line co-extruded reinforced double-wall corrugated pipe provided by the present invention;
[0026] Figure 6 A schematic diagram of the internal structure of the support layer provided by the present invention;
[0027] Figure 7 A schematic diagram of the internal structure of the axial protrusion reinforcement layer and the thread reinforcement layer provided by the present invention.
[0028] Among them: 1 is the bellows body; 2 is the reinforcement layer; 3 is the reinforcement rib; 4 is the corrugated ring; 5 is the support layer; 51 is the connecting layer; 52 is the gradient layer; 6 is the axial protrusion; 7 is the axial marking line; 8 is the thread reinforcement layer. DETAILED DESCRIPTION
[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0030] See also Figure 1-7 The embodiment of the present invention discloses a die line co-extruded reinforced double-wall corrugated pipe, comprising:
[0031] A bellows body 1, one end of the bellows body 1 is set as a socket, the other end of the bellows body 1 is set as a plug, a reinforcing layer 2 is set at the outer side of the outer wall of the socket at the die seam, the reinforcing layer 2 is set as a sleeve, the reinforcing layer 2 completely wraps the socket, the inner diameter of the reinforcing layer 2 is larger than the inner diameter of the bellows body 1, and a plurality of reinforcing ribs 3 are set at the connection position between the reinforcing layer 2 and the bellows body 1, and the plurality of reinforcing ribs 3 are all inclinedly arranged; by setting the reinforcing layer 2, the wall thickness of the bellows body 1 at the die seam can be increased, and the strength of the bellows body 1 at the die seam can be improved; when shrinkage marks are generated at the die seam of the bellows body 1, the reinforcing layer 2 also plays a covering role, which improves the appearance of the product; by setting the reinforcing ribs 3, the connection strength between the bellows body 1 and the reinforcing layer 2 is improved, the breaking strength and breaking elongation of the bellows body 1 are improved, and the ring flexibility of the bellows body 1 at the die seam is improved;
[0032] The corrugated ring 4 is provided in plurality, and the plurality of corrugated rings 4 are evenly spaced and arranged on the outer surface of the bellows body 1; the corrugated ring 4 greatly enhances the ring stiffness of the bellows body 1, thereby enhancing the resistance of the bellows body 1 to loads.
[0033] In this embodiment, the inner wall of the bellows body 1 is provided with a support layer 5, and the support layer 5 is arranged in the middle position of the bellows body 1; by providing the support layer 5, the strength of the middle part of the bellows body 1 is improved, and the resistance of the bellows body 1 to the load is enhanced.
[0034] In this embodiment, the supporting layer 5 includes a connecting layer 51 and a gradient layer 52. The inner diameter of the connecting layer 51 is smaller than the inner diameter of the inner wall of the bellows body 1. Two gradient layers 52 are provided, and the two gradient layers 52 are connected to both ends of the connecting layer 51. The inner diameter of the gradient layer 52 at one end away from the connecting layer 51 is the same as the inner diameter of the inner wall of the bellows body 1. The inner diameter of the gradient layer 52 gradually decreases from one end away from the connecting layer 51 to the other end, and the inner diameter of the other end of the gradient layer 52 is the same as the inner diameter of the connecting layer 51. By setting the inner diameter of one end of the gradient layer 52 to be the same as the inner diameter of the inner wall of the bellows body 1, the influence on the channel formed inside the bellows body 1 is reduced.
[0035] In this embodiment, the reinforcing layer 2 is configured as an axial protrusion reinforcing layer, and the axial protrusion reinforcing layer is configured as a plurality of axial protrusions 6 evenly distributed on the socket in a circumferential manner, the axial protrusions 6 completely wrap the socket, and both ends of each axial protrusion 6 are configured as round heads; the axial protrusion reinforcing layer can increase the wall thickness of the mold seam of the corrugated pipe body 1 and improve the strength of the mold seam of the corrugated pipe body 1; when shrinkage marks are generated at the mold seam of the corrugated pipe body 1, the reinforcing layer 2 also plays a covering role, thereby improving the appearance of the product.
[0036] In this embodiment, an axial marking line 7 is provided on the inner wall of the bellows body 1, and a plurality of axial marking lines 7 are provided, and the plurality of axial marking lines 7 are evenly distributed on the inner wall of the bellows body 1 in a circular shape, and a plurality of axial protrusions 6 are symmetrically arranged along the axial line; the axial marking line 7 is arranged on the inner wall of the bellows body 1, which will not affect the overall appearance of the bellows body 1, and can provide obvious direction when connecting two bellows bodies 1, so that the joining lines of the bellows body 1 are aligned in the axial direction, which can improve the strength of the bellows body 1 to a certain extent.
[0037] In this embodiment, the reinforcing layer 2 is configured as a threaded reinforcement layer 8, which completely wraps the socket, and the inner diameter of the thread of the threaded reinforcement layer 8 is the same as the inner diameter of the corrugated ring 4; the threaded reinforcement layer 8 can increase the wall thickness at the mold seam of the corrugated pipe body 1, and improve the strength of the mold seam of the corrugated pipe body 1; when shrinkage marks are generated at the mold seam of the corrugated pipe body 1, the reinforcing layer 2 also plays a covering role, thereby improving the appearance of the product.
[0038] In this embodiment, the material of the reinforcing layer 2 is set to be a special material for PE100 pipes, and a modified material EVA resin is added to the reinforcing layer 2; under the action of external force, when the corrugated pipe body 1 is deformed, the part with the largest stretching ratio is at the outermost side of the horizontal position of the outer wall of the pipe corrugated pipe body 1, and this part is composed of the reinforcing layer 2. The raw material of the reinforcing layer 2 is a special material for PE100 pipes and a modified material EVA resin is added to improve the flexibility and tensile properties of the material. Therefore, it has very high breaking strength and breaking elongation, thereby improving the annular flexibility at the mold seam of the outer wall of the corrugated pipe body 1.
[0039] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.
[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A die line co-extruded reinforced double-wall corrugated pipe, characterized in that: include: A bellows body, one end of the bellows body is set as a socket, the other end of the bellows body is set as a plug, a reinforcing layer is set at the outer side of the outer wall of the bellows at the die seam, the reinforcing layer is set as a sleeve, the reinforcing layer completely wraps the bellows, the inner diameter of the reinforcing layer is larger than the inner diameter of the bellows body, a plurality of reinforcing ribs are set at the connection position between the reinforcing layer and the bellows body, and the plurality of reinforcing ribs are all inclined; A corrugated ring, wherein a plurality of the corrugated rings are arranged evenly spaced on the outer surface of the bellows body.
2. The die line co-extruded reinforced double-wall corrugated pipe according to claim 1, characterized in that: The inner wall of the bellows body is provided with a support layer, and the support layer is arranged in the middle position of the bellows body.
3. The die line co-extruded reinforced double-wall corrugated pipe according to claim 2, characterized in that: The supporting layer includes a connecting layer and a gradient layer. The inner diameter of the connecting layer is smaller than the inner diameter of the inner wall of the corrugated pipe body. Two gradient layers are provided. The two gradient layers are connected to both ends of the connecting layer. The inner diameter of the gradient layer at one end away from the connecting layer is the same as the inner diameter of the inner wall of the corrugated pipe body. The inner diameter of the gradient layer gradually decreases from one end away from the connecting layer to the other end, and the inner diameter of the other end of the gradient layer is the same as the inner diameter of the connecting layer.
4. The die line co-extruded reinforced double-wall corrugated pipe according to claim 1, characterized in that: The reinforcement layer is configured as an axial protrusion reinforcement layer, and the axial protrusion reinforcement layer is configured as a plurality of axial protrusions uniformly distributed on the socket in a circumference, the axial protrusions completely wrap the socket, and both ends of each axial protrusion are configured as round heads.
5. The die line co-extruded reinforced double-wall corrugated pipe according to claim 4, characterized in that: An axial marking line is arranged on the inner wall of the bellows body, and a plurality of the axial marking lines are arranged. The plurality of the axial marking lines are evenly distributed on the inner wall of the bellows body in a circumferential manner, and the plurality of the axial protrusions are symmetrically arranged along the axial line.
6. The die line co-extruded reinforced double-wall corrugated pipe according to claim 1, characterized in that: The reinforcement layer is configured as a thread reinforcement layer, the thread reinforcement layer completely wraps the socket, and the inner diameter of the thread of the thread reinforcement layer is the same as the inner diameter of the corrugated ring.
7. The die line co-extruded reinforced double-wall corrugated pipe according to claim 1, characterized in that: The material of the reinforcement layer is set to be a special material for PE100 pipes, and a modified material EVA resin is added into the reinforcement layer.