A long-glass-fiber reinforced plastic double-wall spiral corrugated pipe and a preparation device and method thereof

Abstract

The application belongs to the field of plastic pipe manufacturing, and particularly discloses a long-glass-fiber reinforced plastic double-wall spiral corrugated pipe and a preparation device and method thereof, which comprises a corrugated reinforcing structure layer integrally formed by long-glass-fiber reinforced plastic, the components of the long-glass-fiber reinforced plastic include long glass fibers and a plastic matrix, and the length of the long glass fibers is 2-25 mm; through the synergistic effect of the long glass fibers and the plastic matrix, the rigidity and impact resistance are significantly improved, and the problem of large brittleness and easy breakage of traditional pipes is effectively solved; the efficient reinforcement of the long glass fibers can reduce the wall thickness, combined with optional calcium carbonate fillers, the raw material consumption and cost are reduced; the pipe can be produced by reforming the existing production line, the equipment investment is reduced, and large-size products can be produced; the corrugated reinforcing structure layer is integrally formed with the inner lining layer and the outer protective layer, there is no stress hidden danger, the interlayer combination is tight, the inner lining layer reduces the resistance, the outer protective layer is corrosion resistant, and the pipe is suitable for complex working conditions.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of plastic pipe manufacturing, and particularly relates to a long-glass-fiber-reinforced plastic double-wall spiral corrugated pipe and a preparation device and method thereof. BACKGROUND

[0002] As a key facility for rainwater and sewage discharge, a plastic drainage pipe needs to bear external pressure such as backfill earthwork and road load for a long time, and the structural rigidity and impact resistance thereof directly determine the engineering reliability. At present, the industry mainly improves the performance of the drainage pipe through two ways:

[0003] Inorganic powder modification: filling the plastic matrix with calcium carbonate, talc powder and the like can increase the elastic modulus by about 1.5 times, but the rigidity is limited due to the dispersion and enhancement mechanism of the powder, and the wall thickness of the pipe needs to be increased to meet the strength requirement, which leads to an increase in raw material consumption and high cost, and the brittleness of the material is significantly increased, and the pipe is prone to be damaged by impact during transportation, installation and backfilling.

[0004] Short glass fiber (0.5-1 mm) reinforcement: the elastic modulus can be increased to about 2.0 times that of ordinary plastic, but the interfacial bonding force between the short glass fiber and the plastic matrix is limited, and the reinforcement effect is still not ideal, and the wall thickness is still thick and the cost is still high.

[0005] In terms of forming process, the existing technology has obvious limitations:

[0006] Winding forming method: the reinforcing structure is cooled and shaped first, and then is cold-drawn and adhered to the outer wall of the inner pipe by external force. In this process, a large rebound stress is generated between the structure and the inner pipe, which easily leads to separation of the two, and there is a serious quality risk, affecting the service life of the pipe.

[0007] Melt forming method: the corrugation is directly formed on the outer wall of the solid-wall pipe through hot extrusion, which can avoid the stress problem and ensure the stable combination of the wave crest and the inner layer pipe, but it depends on expensive forming equipment, and it is difficult to produce large-size products with a diameter of more than 800 mm due to the limitation of the equipment, and the popularization and application are limited.

[0008] In summary, the existing technology has problems such as insufficient rigidity improvement, high cost, high brittleness, and defects in the forming process, and there is an urgent need for a plastic drainage pipe with high rigidity, high impact resistance, low cost and suitable for efficient production and a preparation scheme. SUMMARY

[0009] The purpose of the present application is to provide a long-glass-fiber-reinforced plastic double-wall spiral corrugated pipe and a preparation device and method thereof, to solve the problems of insufficient rigidity improvement, high cost, high brittleness and defects in the forming process of the existing corrugated pipe as described in the background.

[0010] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0011] A long glass fiber reinforced plastic double-wall spiral corrugated pipe comprises a corrugated reinforcing structure layer integrally formed by long glass fiber reinforced plastic, and the components of the long glass fiber reinforced plastic comprise long glass fiber and plastic matrix, and the length of the long glass fiber is 2-25 mm.

[0012] Preferably, the components of the long glass fiber reinforced plastic comprise, in percentage by mass, 30-90% of long glass fiber, and 10-70% of plastic matrix.

[0013] Preferably, the components of the long glass fiber reinforced plastic further comprise calcium carbonate filler, and the percentage by mass of the long glass fiber, the plastic matrix and the calcium carbonate filler is 10-30%, 30-80% and 10-40% respectively.

[0014] Preferably, the plastic matrix comprises one of PP, HDPE and PVC, and the plastic matrix contains antioxidant and maleic anhydride grafted solubilizer.

[0015] Preferably, the double-wall spiral corrugated pipe further comprises at least one of a plastic inner lining layer and a plastic outer protective layer, and the plastic inner lining layer and the plastic outer protective layer are integrally formed by the plastic matrix.

[0016] Preferably, the double-wall spiral corrugated pipe is composed of the plastic inner lining layer and the corrugated reinforcing structure layer.

[0017] Preferably, the double-wall spiral corrugated pipe is composed of the plastic outer protective layer and the corrugated reinforcing structure layer.

[0018] Preferably, the double-wall spiral corrugated pipe is composed of the plastic outer protective layer, the plastic inner lining layer and the corrugated reinforcing structure layer.

[0019] A preparation device for a long glass fiber reinforced plastic double-wall spiral corrugated pipe, used for preparing the long glass fiber reinforced plastic double-wall spiral corrugated pipe, and comprising, in sequence along the production line direction:

[0020] at least one extruder for extruding the corrugated reinforcing structure layer, and at least one of the plastic inner lining layer and the plastic outer protective layer;

[0021] a push-type mold connected with the extruder and provided with a built-in cooling circulating water channel;

[0022] a vacuum cooling water tank provided with a rotating sizing sleeve with a trapezoidal scraper;

[0023] a spraying cooling device, a traction machine, a marking machine and a cutting machine.

[0024] A preparation method for a long glass fiber reinforced plastic double-wall spiral corrugated pipe, used for preparing the long glass fiber reinforced plastic double-wall spiral corrugated pipe, and comprising:

[0025] S1, long glass fiber reinforced plastic is added into an extruder, and the extrusion melt is pushed into a push type mold;

[0026] S2, the push type mold cooling circulating water channel is opened, so that the inner wall of the pipe is crystallized to form a composite pipe blank;

[0027] S3, the composite pipe blank is sent into a vacuum cooling water tank by a traction machine, and is formed into a spiral corrugation under the action of a trapezoidal scraper of a rotating sizing sleeve;

[0028] S4, after being cooled and shaped by a spraying cooling device, identification and cutting are sequentially performed.

[0029] Compared with the prior art, the beneficial effects of the present application are:

[0030] The present application significantly improves rigidity and impact resistance through the synergistic effect of long glass fiber and plastic matrix, effectively improves the problem of large brittleness and easy breakage of traditional pipes; the high efficiency of long glass fiber can reduce the wall thickness, combined with optional calcium carbonate filler, to reduce the raw material consumption and cost; the production can be realized by using the existing production line, the equipment investment is reduced, and large size products can be produced; the corrugated reinforcing structure layer, the inner lining layer and the outer protective layer are integrally formed by melting, there is no stress hidden danger, the interlayer combination is tight, the inner lining layer reduces the resistance, the outer protective layer prevents corrosion, and is suitable for complex working conditions; the solubilizer improves the compatibility of each component, the antioxidant delays aging, and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0032] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0033] Figure 2 It is a structure block diagram of the preparation equipment of the present application.

[0034] In the figure: 1, corrugated reinforcing structure layer; 2, plastic inner lining layer; 3, plastic outer protective layer. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings of the specification.

[0036] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0037] It should also be noted that, as used in the specification and in the claims, the article "a", "an", or "the" is intended to mean that there is at least one of the particular feature. For example, "an element" shall mean that there is at least one element.

[0038] As shown in the accompanying drawings: Figure 1 to the accompanying drawings: Figure 2 As shown in the accompanying drawings:

[0039] Embodiment one: the embodiment provides a long glass fiber reinforced plastic double-wall spiral corrugated pipe, which comprises a corrugated reinforcing structure layer 1 integrally formed by long glass fiber reinforced plastic. The components of the long glass fiber reinforced plastic include long glass fiber and plastic matrix, and the length of the long glass fiber is 10 mm.

[0040] Specifically, the components of the long glass fiber reinforced plastic include long glass fiber 50%, plastic matrix 50%, and 1% PE maleic anhydride grafting compatibilizer. In the long glass fiber plastic manufacturing equipment, long glass fiber reinforced polyethylene material is produced.

[0041] Specifically, the components of the long glass fiber reinforced plastic further include calcium carbonate filler, and the mass percentage of the long glass fiber is 10-30%, the mass percentage of the plastic matrix is 30-80%, and the mass percentage of the calcium carbonate filler is 10-40%.

[0042] Specifically, the plastic matrix contains antioxidants and maleic anhydride grafted HDPE solubilizer, and the plastic matrix includes HDPE.

[0043] A long glass fiber reinforced plastic double-wall spiral corrugated pipe preparation device is used to prepare the long glass fiber reinforced plastic double-wall spiral corrugated pipe described above. The preparation device comprises, in sequence along the production line direction:

[0044] An extruder for extruding the corrugated reinforcing structure layer 1;

[0045] A push-type mold connected with the extruder, with an internal cooling circulating water channel;

[0046] A vacuum cooling water tank with a rotating sizing sleeve with a trapezoidal scraper;

[0047] A spray cooling device, a traction machine, a marking machine, and a cutting machine.

[0048] A preparation method of a long glass fiber reinforced plastic double-wall spiral corrugated pipe, for preparing the long glass fiber reinforced plastic double-wall spiral corrugated pipe, comprising:

[0049] S1, long glass fiber reinforced polyethylene material is added into an extruder to extrude a corrugated reinforcing structure layer 1 melt to a push-type mold;

[0050] S2, the push-type mold cooling circulating water channel is opened, and the inner wall of the pipe is crystallized to form a composite pipe blank;

[0051] S3, the composite pipe blank is sent into a vacuum cooling water tank by a traction machine, and spiral corrugations are formed under the action of a trapezoidal scraper of a rotating sizing sleeve;

[0052] S4, after being cooled and shaped by a spraying cooling device, the spiral corrugated pipe is sequentially marked by a marking machine and cut by a cutting machine, to obtain a circular pipe body and a corrugated structure integrated pipe with high impact resistance and high rigidity, the rigidity of the corrugated pipe is 6-8 times that of ordinary plastic and 3-4 times that of short glass fiber, which greatly saves the raw material cost of manufacturing the spiral corrugated pipe.

[0053] Embodiment two: the embodiment provides a long glass fiber reinforced plastic double-wall spiral corrugated pipe, which comprises a corrugated reinforcing structure layer 1 integrally formed by long glass fiber reinforced plastic, and the components of the long glass fiber reinforced plastic comprise long glass fiber and a plastic matrix, and the length of the long glass fiber is 12 mm.

[0054] Specifically, the components of the long glass fiber reinforced plastic further comprise calcium carbonate fillers, and the mass percentage of the long glass fiber, the plastic matrix and the calcium carbonate fillers is 20%, 45% and 35% respectively, wherein the calcium carbonate fillers are modified by a titanate coupling agent, and 1% of PE maleic anhydride grafting compatibilizer is added, and a long glass fiber reinforced polyethylene material is produced in a long glass fiber plastic manufacturing device.

[0055] Specifically, the plastic matrix comprises an antioxidant and a maleic anhydride grafted HDPE solubilizer, and the plastic matrix comprises HDPE.

[0056] Specifically, the double-wall spiral corrugated pipe further comprises a plastic lining layer 2, and the plastic lining layer 2 is integrally formed by the plastic matrix.

[0057] Specifically, the double-wall spiral corrugated pipe is composed of the plastic lining layer 2 and the corrugated reinforcing structure layer 1.

[0058] A preparation device of a long glass fiber reinforced plastic double-wall spiral corrugated pipe, for preparing the long glass fiber reinforced plastic double-wall spiral corrugated pipe, comprising, in sequence along the production line direction:

[0059] Two extruders for extruding a corrugated reinforcing structure layer 1 and a plastic lining layer 2;

[0060] A push-type mold connected with the extruder and provided with a built-in cooling circulating water channel;

[0061] Vacuum cooling water tank, built-in rotating sizing sleeve with trapezoidal scraper;

[0062] Spray cooling device, traction machine, marking machine and cutting machine.

[0063] A method for preparing a long-glass-fiber-reinforced plastic double-wall spiral corrugated pipe, for preparing the long-glass-fiber-reinforced plastic double-wall spiral corrugated pipe, comprising:

[0064] S1, long-glass-fiber-reinforced plastic is added to an extruder to melt and extrude to a push-type mold, and HDPE raw material is added to a second extruder to melt and extrude to the push-type mold (co-extrusion);

[0065] S2, the push-type mold cooling circulating water channel is opened, and the inner wall of the pipe is crystallized to form a composite pipe blank;

[0066] S3, the composite pipe blank is sent into a vacuum cooling water tank by a traction machine, and spiral corrugations are formed under the action of the trapezoidal scraper of the rotating sizing sleeve;

[0067] S4, after being cooled and shaped by the spray cooling device, the spiral corrugated pipe is sequentially marked by a marking machine and cut by a cutting machine, to obtain a circular pipe body and a corrugated structure integrated pipe with high rigidity and high impact resistance, the rigidity of the corrugated pipe is 6-8 times that of ordinary plastic and 3-4 times that of short glass fiber, which greatly saves the raw material cost of manufacturing the spiral corrugated pipe.

[0068] Embodiment three: the embodiment provides a long-glass-fiber-reinforced plastic double-wall spiral corrugated pipe, comprising a corrugated reinforcing structure layer 1 integrally formed by long-glass-fiber-reinforced plastic, the components of the long-glass-fiber-reinforced plastic comprising long glass fiber and plastic matrix, and the length of the long glass fiber being 12 mm.

[0069] Specifically, the components of the long-glass-fiber-reinforced plastic further comprise calcium carbonate fillers, and the mass percentage of the long glass fiber, the plastic matrix and the calcium carbonate fillers is 20%, 45% and 35% respectively, wherein the calcium carbonate fillers are modified with a titanate coupling agent, and 1% of PE maleic anhydride grafting compatibilizer is added, and a long-glass-fiber-reinforced polyethylene material is produced in a long-glass-fiber-plastic manufacturing device.

[0070] Specifically, the plastic matrix comprises an antioxidant and a maleic anhydride grafted HDPE solubilizer, and the plastic matrix comprises HDPE.

[0071] Specifically, the double-wall spiral corrugated pipe further comprises a plastic outer protective layer 3, and the plastic outer protective layer 3 is integrally formed by the plastic matrix.

[0072] Specifically, the double-wall spiral corrugated pipe is composed of the plastic outer protective layer 3 and the corrugated reinforcing structure layer 1.

[0073] A preparation device of long glass fiber reinforced plastic double-wall spiral corrugated pipe, for preparing the long glass fiber reinforced plastic double-wall spiral corrugated pipe, sequentially includes, along the production line direction:

[0074] Two extruders for extruding the corrugated reinforcing structure layer 1 and the plastic outer protective layer 3;

[0075] A push-type mold connected with the extruders, with a built-in cooling circulating water channel;

[0076] A vacuum cooling water tank, with a built-in rotating sizing sleeve with a trapezoidal scraper;

[0077] A spraying cooling device, a traction machine, a marking machine and a cutting machine.

[0078] A preparation method of long glass fiber reinforced plastic double-wall spiral corrugated pipe, for preparing the long glass fiber reinforced plastic double-wall spiral corrugated pipe, comprising:

[0079] S1, long glass fiber reinforced polyethylene material is added to the extruder to extrude the corrugated reinforcing structure layer 1 melt to the push-type mold, and HDPE raw material is added to the extruder to extrude the plastic outer protective layer 3 melt to the push-type mold (co-extrusion);

[0080] S2, the cooling circulating water channel of the push-type mold is turned on, so that the inner wall of the pipe is crystallized to form a composite pipe blank;

[0081] S3, the composite pipe blank is sent into the vacuum cooling water tank by the traction machine, and the spiral corrugation is formed under the action of the trapezoidal scraper of the rotating sizing sleeve;

[0082] S4, after being cooled and shaped by the spraying cooling device, the spiral corrugated pipe is sequentially marked by the marking machine and cut by the cutting machine, to obtain a high-impact-resistant round pipe body and a corrugated structure integrated pipe, the rigidity of the corrugated pipe is 6-8 times that of ordinary plastic and 3-4 times that of short glass fiber, which greatly saves the raw material cost of manufacturing the spiral corrugated pipe.

[0083] Embodiment four: the embodiment provides a long glass fiber reinforced plastic double-wall spiral corrugated pipe, which comprises a corrugated reinforcing structure layer 1 integrally formed by long glass fiber reinforced plastic, and the components of the long glass fiber reinforced plastic comprise long glass fiber and plastic matrix, and the length of the long glass fiber is 12 mm.

[0084] Specifically, the components of the long glass fiber reinforced plastic further comprise calcium carbonate fillers, and the mass percentage of the long glass fiber, the plastic matrix and the calcium carbonate fillers is 20%, 45% and 35% respectively, wherein the calcium carbonate fillers are modified by a titanate coupling agent, and 1% PE maleic anhydride grafting compatibilizer is added, and long glass fiber reinforced polyethylene material is produced in a long glass fiber plastic manufacturing device.

[0085] Specifically, the plastic base contains an antioxidant and a maleic anhydride grafted HDPE solubilizer, and the plastic base includes HDPE.

[0086] Specifically, the double-wall spiral corrugated pipe further includes a plastic inner lining layer 2 and a plastic outer protective layer 3, both of which are integrally formed from a plastic base.

[0087] Specifically, the double-wall spiral corrugated pipe is composed of a plastic outer protective layer 3, a plastic inner lining layer 2, and a corrugated reinforcing structure layer 1.

[0088] A preparation device for a long glass fiber reinforced plastic double-wall spiral corrugated pipe, for preparing the long glass fiber reinforced plastic double-wall spiral corrugated pipe, sequentially includes, along the production line direction:

[0089] Three extruders for extruding the corrugated reinforcing structure layer 1, and the plastic inner lining layer 2 and the plastic outer protective layer 3;

[0090] A push-type mold connected with the extruders, with an internal cooling circulating water channel;

[0091] A vacuum cooling water tank with a rotating sizing sleeve with a trapezoidal scraper;

[0092] A spray cooling device, a traction machine, a marking machine, and a cutting machine.

[0093] A preparation method for a long glass fiber reinforced plastic double-wall spiral corrugated pipe, for preparing the long glass fiber reinforced plastic double-wall spiral corrugated pipe, comprising:

[0094] S1, adding long glass fiber reinforced polyethylene material into the extruder to extrude the corrugated reinforcing structure layer 1 melt into the push-type mold, and adding HDPE raw materials into the second and third extruders to extrude the plastic outer protective layer 3 melt and the plastic inner lining layer 2 melt (extruded together);

[0095] S2, turning on the cooling circulating water channel of the push-type mold to make the inner wall of the pipe crystallize to form a composite pipe blank;

[0096] S3, sending the composite pipe blank into the vacuum cooling water tank through the traction machine, and forming spiral corrugations under the action of the trapezoidal scraper of the rotating sizing sleeve;

[0097] S4, after being cooled and shaped by the spray cooling device, sequentially passing through the marking machine for marking and the cutting machine for cutting the spiral corrugated pipe, obtaining a high-rigidity and high-impact round pipe body and a corrugated structure integrated pipe, the rigidity of the corrugated pipe is 6-8 times that of ordinary plastic and 3-4 times that of short glass fiber, greatly saving the raw material cost of manufacturing the spiral corrugated pipe.

[0098] The long glass fiber reinforced plastic base with a length of 2-25 mm is adopted, through the synergistic effect of the fiber and the base, the rigidity strength of the corrugated pipe is 6-8 times that of ordinary plastic and 3-4 times that of short glass fiber reinforced plastic, the impact resistance is significantly improved, the problem of large brittleness and easy breakage of the traditional pipe material is effectively solved, and the demand of high load scene is met;

[0099] The high efficient reinforcing effect of the long glass fiber can reduce the pipe wall thickness, in combination with the optional calcium carbonate filler (modified by a coupling agent to improve the compatibility), the raw material usage is reduced by more than 30%, and the production cost is greatly reduced; at the same time, the reasonable ratio of the long glass fiber and the plastic base (30-90% long glass fiber + 10-70% plastic base, or the composite ratio containing the filler) further optimizes the cost structure under the premise of ensuring the performance;

[0100] The market stock PE water supply pipe production line can be used to realize production through local accessory modification (such as push type mold, rotary sizing sleeve, etc.), without full investment in new equipment, and the equipment capital investment is greatly reduced; at the same time, the push type mold is matched with the vacuum cooling shaping process, and products with a size of more than 800 mm can be produced, which breaks through the size limitation of the traditional melt forming method;

[0101] The corrugated reinforced structure layer, the plastic inner lining layer and the outer protective layer are integrally formed by melting, there is no stress rebound problem of the cold winding method, the interlayer combination is tight, and the quality hidden danger of separation of the structure and the inner layer pipe is avoided; the inner lining layer can improve the smoothness of the inner wall (reduce the water flow resistance), and the outer protective layer can enhance the corrosion resistance and adapt to complex working conditions;

[0102] The maleic anhydride grafted solubilizer (such as maleic anhydride grafted PP / HDPE / PVC) is added in the plastic base to improve the interfacial compatibility of the long glass fiber, the plastic base and the calcium carbonate filler, and avoid material delamination; the addition of the antioxidant can delay material aging and prolong the service life of the drainage pipe.

[0103] On the other hand, a large amount of stock PE water supply pipe production lines on the market can be fully utilized, and through partial accessory modification and upgrading, a melt forming method spiral corrugated pipe production line is formed, the product quality is high and the cost is low; at the same time, the equipment capital investment is greatly saved, and the stock social resources are revitalized.

[0104] It is important to note that the construction and arrangement of the application shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review the present disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be altered or varied. Thus, the foregoing description is by way of example only, and is not intended to be limiting. The application is limited only as defined in the following claims and equivalents thereto. The sequence of any process or method steps, or the order in which they are carried out, can be altered or re-ordered without departing from the scope of the application. Any "articles of manufacture" or "manufacturing" as described herein are intended to encompass structures constructed of a multitude of different physical elements or components. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and also cover structures yet to be invented which perform the recited function but operate in a different manner. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the application as expressed in the appended claims.

[0105] Also, to provide a concise description of the exemplary embodiments, not all features of an actual implementation can be described (that is, not all implementations can include all of the features described or optional implementations can include only a subset of the features described).

[0106] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions can be made. Such development efforts can inevitably lead to modifications, not all of which can be foreseen in advance. Such modifications are not to be regarded as a departure from the spirit and scope of the present application, and all such modifications are intended to be included within the scope of the present application. The disclosure is not a complete description of the actual implementation, nor is it intended to be so; thus, what is actually devised can depart from what is described in this disclosure.

[0107] It should be noted that the above examples are merely used to illustrate the technical solutions of the present application, but not limit the present application, and although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalent replaced without departing from the spirit and scope of the present application, and all of them should be included in the scope of the claims of the present application.

Claims

1. A long glass fiber reinforced plastic double-walled helical corrugated pipe, characterized in that, It includes a corrugated reinforced structural layer integrally formed from long glass fiber reinforced plastic, wherein the long glass fiber reinforced plastic comprises long glass fibers and a plastic matrix, and the long glass fibers have a length of 2 to 25 mm; The plastic matrix contains antioxidants and maleic anhydride graft solubilizers, and the plastic matrix includes one of PP, HDPE, and PVC; The double-walled spiral corrugated pipe further includes at least one of a plastic inner liner and a plastic outer protective layer, both of which are integrally formed from a plastic matrix. The method for preparing the long glass fiber reinforced plastic double-walled helical corrugated pipe includes: S1. Add long glass fiber reinforced plastic to an extruder and extrude the melt into a push-type die; S2. Open the cooling circulation channel of the push-type mold to allow the inner wall of the pipe to crystallize and form a composite pipe blank; S3. The composite tube blank is fed into the vacuum cooling water tank by the traction machine, and spiral corrugations are formed under the action of the trapezoidal scraper of the rotating sizing sleeve. S4. After being cooled and shaped by the spray cooling device, the parts are marked and cut in sequence.

2. The long glass fiber reinforced plastic double-walled spiral corrugated pipe according to claim 1, characterized in that, The components of the long glass fiber reinforced plastic, by mass percentage, include: 30-90% long glass fibers and 10-70% plastic matrix.

3. The long glass fiber reinforced plastic double-walled spiral corrugated pipe according to claim 1, characterized in that, The composition of the long glass fiber reinforced plastic also includes calcium carbonate filler, with a mass percentage of 10-30% long glass fiber, 30-80% plastic matrix, and 10-40% calcium carbonate filler.

4. The long glass fiber reinforced plastic double-walled spiral corrugated pipe according to claim 1, characterized in that, The double-walled spiral corrugated pipe is composed of a plastic inner lining layer and a corrugated reinforcing structural layer fused together.

5. The long glass fiber reinforced plastic double-walled spiral corrugated pipe according to claim 1, characterized in that, The double-walled spiral corrugated pipe is composed of a plastic outer protective layer and a corrugated reinforcing structural layer fused together.

6. The long glass fiber reinforced plastic double-walled helical corrugated pipe according to claim 1, characterized in that, The double-walled spiral corrugated pipe is composed of a plastic outer protective layer, a plastic inner lining layer, and a corrugated reinforcing structural layer fused together.

7. A fabrication apparatus for a long glass fiber reinforced plastic double-walled helical corrugated pipe, used to fabricate a long glass fiber reinforced plastic double-walled helical corrugated pipe as described in any one of claims 1-6, characterized in that, Along the production line direction, it includes, in sequence: At least one extruder for extruding a corrugated reinforced structural layer, and at least one of a plastic inner liner and a plastic outer protective layer; A push-type die connected to an extruder, with a built-in cooling circulation channel; Vacuum cooling water tank with built-in rotating sizing sleeve with trapezoidal scraper; The composite tube blank is fed into the vacuum cooling water tank by a traction machine, and spiral corrugations are formed under the action of the trapezoidal scraper of the rotating sizing sleeve. After being cooled and shaped by a spray cooling device, the spiral corrugated pipe is marked by a marking machine and then cut by a cutting machine.

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