Steel lining multi-layer composite wear-resistant pipeline

Abstract

The utility model relates to the technical field of composite wear-resistant pipelines, and discloses a steel lining multi-layer composite wear-resistant pipeline which comprises a steel pipe and a lining pipe in the steel pipe, the lining pipe sequentially comprises a modified wear-resistant layer, a polyethylene layer and an adhesive resin layer from inside to outside, and the pipe end of the lining pipe is of a flanging structure formed by extending out of the end of the steel pipe. The plane where the pipe end of the lining pipe is located is perpendicular to the axis of the pipeline to ensure that the circulation diameter of the pipeline is consistent, the consistency of the internal circulation diameter of the composite pipe can be kept, and the problem of accelerated damage of the pipeline caused by rapid abrasion of a pipeline joint due to local vortexes can be avoided; the adhesive resin layer is made of maleic anhydride grafted modified polyethylene, and the adhesive resin layer can be well compounded with the inner wall of the steel pipe through chemical bonds generated after polyethylene resin is grafted through maleic anhydride, so that when the pipeline is subjected to negative pressure or runs, the structural layering problem generated by a traditional tight lining composite pipeline is not generated any more.

Description

TECHNICAL FIELD

[0001] The utility model relates to composite wear -resistant pipeline technical field especially a steel lining multilayer composite wear -resistant pipeline. BACKGROUND

[0002] With the development of technology, pipeline transportation as a new transportation mode gradually rises, wherein fluid conveying by adopting solid-liquid mixed state is applied by some resource-based enterprises in a large area due to its high economy and high efficiency, such as long-distance coal water slurry conveying, non-coal mine slurry pipeline for material conveying, mine enterprises for tailing filling and tailing discharge, etc. This type of pipeline generally has the characteristics of fast wear speed, high operation pressure and high cost, and belongs to consumable pipeline type, and the selection of pipeline is extremely important for the economy of pipeline network operation. The current products for this type of solid-liquid mixed state fluid conveying pipeline can be divided into corrosion-resistant steel pipe, steel pipe lining wear-resistant layer pipeline (rubber, ultra-high molecular weight polyethylene, ceramic, polyurethane, etc.), non-metal composite pipeline (including co-extrusion wear-resistant layer pipeline), non-metal pipeline (ultra-high molecular weight polyethylene pipe, nylon pipe, polyethylene pipe, polyformaldehyde pipe, etc.). But each product has different advantages and disadvantages.

[0003] The non-metal composite pipeline has strong high pressure bearing capacity compared with the plastic pipeline in terms of product pressure bearing capacity, but it is still a non-metal pipeline, and there is still a big economic loss problem in high pressure bearing and temperature resistance compared with the metal pipeline. Some materials of the non-metal pipeline have certain wear resistance, so the non-metal pipeline has strong market competitiveness and cost performance compared with the metal pipeline in the low pressure field, but the non-metal pipeline has a obvious disadvantage that the pressure bearing capacity is limited by the material strength and temperature resistance, so the product economy and design feasibility are reduced when the pipeline has slightly high pressure demand, so the development of the non-metal pipeline is limited in the slightly high pressure field.

[0004] The pressure bearing substrate of the metal corrosion-resistant pipeline and the steel pipe lining wear-resistant layer pipeline is the steel pipe, and the pressure bearing capacity of the pipeline benefits from the high yield strength of the material, so the pressure bearing is generally high and the economy of high pressure bearing is strong, but the wear resistance of the inner wall of the existing pipeline is slightly weak, the wear speed increases with the long-term use, the product economy is poor, and the ultra-high molecular weight polyethylene lining layer generally has the problem of negative pressure delamination of the lining layer by cold lining process, and the local vortex is easily caused by the inconsistent flow diameter at the pipeline joint, which accelerates the damage of the pipeline. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model aims to provide a steel lining multilayer composite wear-resistant pipeline, so that the pipeline no longer has the structure delamination problem of the traditional tight lining composite pipeline under negative pressure or operation, and the consistency of the internal flow diameter of the composite pipeline can be maintained, and the problem of rapid wear of the pipeline joint caused by local vortex can be avoided.

[0006] To achieve the above object, the utility model is through the following technical scheme to realize:

[0007] A kind of steel lining multilayer composite wear-resistant pipeline, including steel pipe and the lining pipe in steel pipe, lining pipe is successively modified wear layer, polyethylene layer and adhesive resin layer from inside to outside, the flanging structure formed by extending to the end of steel pipe at lining pipe end, the plane where lining pipe end is perpendicular to pipeline axis to ensure that pipeline flow diameter is consistent;The adhesive resin layer uses maleic anhydride grafting modified polyethylene.

[0008] As a further implementation mode, the polyethylene layer is high-density polyethylene resin, so that modified wear layer, polyethylene layer and adhesive resin layer form trinity structure.

[0009] As a further implementation mode, the polyethylene layer is integrated with steel pipe by adhesive resin layer, and the modified wear layer is made of high wear-resistant polyolefin pipeline special material.

[0010] As a further implementation mode, the outer surface of the steel pipe is coated and painted with anticorrosive film.

[0011] As a further implementation mode, the lining pipe end is annular structure, one side thereof abuts against the end of steel pipe, and the outer diameter thereof is larger than the pipe diameter of steel pipe.

[0012] As a further implementation mode, the end of steel pipe is provided with a connecting piece, and the connecting piece is provided with a restraint ring with L-shaped cross section at one end.

[0013] As a further implementation mode, the flanging structure of the lining pipe end is filled in the restraint ring.

[0014] As a further implementation mode, the end face of the lining pipe end is provided with a sealing rubber gasket.

[0015] As a further implementation mode, the outer diameter of the sealing rubber gasket is matched with the inner diameter of the restraint ring, and the inner diameter of the sealing rubber gasket is the same as the inner diameter of the lining pipe.

[0016] As a further implementation mode, the connecting piece is a flange structure, and the outer diameter of the connecting piece is larger than the outer diameter of the lining pipe end.

[0017] The utility model has the following beneficial effects:

[0018] 1. The outermost adhesive resin layer of the lining pipe can utilize the chemical bond generated after polyethylene resin is grafted with maleic anhydride to produce better compounding with the inner wall of the steel pipe, and the peeling strength of the adhesive resin and the steel pipe base material is ≥10 N / mm, so that the pipeline no longer produces the structural delamination problem generated by the traditional tight lining composite pipeline when subjected to negative pressure or operation; the plane where the lining pipe end is located is perpendicular to the pipeline axis to ensure that the pipeline flow diameter is consistent, the consistency of the internal flow diameter of the composite pipe can be maintained, the problem of rapid wear of the pipeline joint caused by local vortex flow can be avoided, and the delamination problem can be further prevented.

[0019] 2. The utility model discloses a connecting piece with a restraint ring welded on the outer side of the two ends of the steel pipe, the restraint ring can realize the fixation of the lining pipe, prevent the position change of the lining pipe, and cooperate with the adhesive resin layer to ensure the stability of the lining pipe when conveying fluid.

[0020] 3. The utility model discloses that the recess is formed between the outer side end face of the lining pipe end and the inner side of the restraint ring, is used for setting the sealing rubber pad, and the sealing gasket mainly plays the high pressure sealing effect, and the recess plays the effect of positioning sealing gasket, to improve the installation accuracy and prevent the displacement of sealing gasket under high pressure and cause the pipeline pressure relief problem. DRAWINGS

[0021] The drawings accompanying the specification of the utility model form a part of the utility model and serve to provide further understanding of the utility model. The schematic embodiments of the utility model and their descriptions serve to explain the utility model, and do not constitute an improper limitation on the utility model.

[0022] Figure 1 It is the whole structure schematic diagram of the steel lining multilayer composite wear-resistant pipeline in the utility model embodiment;

[0023] Figure 2 It is the whole structure schematic diagram of the lining pipe in the utility model embodiment.

[0024] In the drawing, the mutual distance or size is exaggerated for showing the position of each part, and the schematic diagram is only illustrative.

[0025] Among them: 1. Steel pipe, 2. Lining pipe, 3. Connecting piece, 4. Restraint ring, 5. Lining pipe end, 6. Sealing rubber pad, 7. Adhesive resin layer, 8. Polyethylene layer, 9. Modified wear-resistant layer. CONCRETE EMBODIMENT

[0026] It should be pointed out that the following detailed description is all exemplary, and aims at providing further description of the utility model. Unless otherwise specified, all the technical and scientific terms used in the utility model have the same meaning as that understood by the ordinary skilled in the art to which the utility model belongs.

[0027] In a typical embodiment of the utility model, reference is made to Figures 1-2 A steel lining multilayer composite wear-resistant pipeline, including steel pipe 1, lining pipe 2, connecting piece 3, restraint ring 4, lining pipe end 5, sealing rubber pad 6, wherein lining pipe 2 includes three-layer structure, is adhesive resin layer 7, polyethylene layer 8, modified wear-resistant layer 9 respectively, lining pipe 2 and lining pipe end 2 are integrated structure (all are pipe materials), and jointly constitute composite pipe lining pipe part.

[0028] As Figure 2 Indicated, it is the structure diagram of lining pipe 2, and it is modified wear-resistant layer 9, polyethylene layer 8 and adhesive resin layer 7 from inside to outside in proper order, lining pipe 2 is bonded on the inside surface of steel pipe through adhesive resin layer 7, and the inside of modified wear-resistant layer 9 is used as the passage of solid-liquid mixed state fluid transport.

[0029] As Figure 1 And Figure 2 Indicated, lining pipe end 5 is the flanging structure formed by extending the two end portions of lining pipe to the end portion of steel pipe, which is formed by lining pipe flanging processing.

[0030] Modified wear-resistant layer 9, polyethylene layer 8 and adhesive resin layer 7 of the embodiment are trinity, the adhesive resin layer uses maleic anhydride grafting modified polyethylene, plays the role of being integrated with steel pipe 1, and does not appear delamination problem during pipeline operation, and the thickness is generally <3mm.

[0031] Polyethylene layer 8 is high-density polyethylene resin, mainly plays the role of lining pipe structure support and composite structure transition, according to the difference of pipe diameter, the wall thickness at this position can be flexibly adjusted, and the main effect of transition effect is to make adhesive resin layer 7, polyethylene layer 8 and modified wear-resistant layer 9 into trinity structure, the three-layer structure does not delaminate when the elongation at break is ≥350%, and also plays a certain auxiliary wear-resistant role. Modified wear-resistant layer 9 is made of high wear-resistant polyolefin pipeline special material, and China patent ZL201811593863.9 "a kind of high wear-resistant polyolefin pipeline special material and its preparation method" discloses a kind of material with good compatibility with polyethylene, which can be used in the wear-resistant layer, the modified material with the same characteristics and good compatibility with polyethylene layer 8 can be used in the use of the modified wear-resistant layer 9, and the thickness of wear-resistant layer can be determined according to the wear amount of the material under the corresponding working condition, to realize the service life design of pipeline.

[0032] The steel pipe of the embodiment plays a pressure-bearing role, and is coated and painted on the outer surface to prevent corrosion, and the outer corrosion of steel pipe 1 is selected according to requirements or working conditions, and coating or paint film can be selected, to adapt to various working conditions, such as buried, open air or strong corrosion fields.

[0033] The steel pipe 1 product design is flexible, and can be designed according to the flow through diameter and the pipe pressure bearing of the overall composite pipe demand, and the outer diameter and the wall thickness, so as to play a high pressure bearing effect. The steel material has strong economy under high pressure bearing compared with the non-metal composite pipe and the non-metal pipe.

[0034] The three-layer structure of the inner lining pipe 2 bears different roles and functions respectively. The adhesive resin layer 7 can produce better composite with the inner wall of the steel pipe by using the chemical bond generated after the polyethylene resin is grafted with maleic anhydride, and the adhesive resin and the steel pipe substrate have a peeling strength of ≥10 N / mm, so that the pipe no longer has the problem of structural delamination generated by the traditional tight lining composite pipe under negative pressure or operation. The polyethylene layer 8 uses high-density polyethylene material with high crystallinity to assist in the molding of the inner lining pipe, and at the same time can play a good structural support role for the inner lining pipe. The transition effect is that the adhesive resin layer 7 and the modified wear-resistant layer 9 form an integrated structure, and the polyethylene layer can continue to play a role by virtue of its wear resistance after the modified wear-resistant layer is worn out. The thickness of the modified wear-resistant layer 9 is designed according to the annual wear amount and the design life of the material under the corresponding working conditions.

[0035] As shown in Figure 1 and Figure 2 , the plane where the inner lining pipe end is located is perpendicular to the pipe axis to ensure the consistency of the pipe flow diameter. The inner lining pipe end 5 and the inner lining pipe 2 are processed using a mold at the pipe end, and the angle between them is controlled at 90°. The 90° angle can maintain the consistency of the internal flow diameter of the composite pipe, and can avoid the problem of accelerated damage of the pipe caused by rapid wear at the pipe joint due to local vortex flow.

[0036] The inner lining pipe end 5 is a ring structure, one side of which abuts against the end of the steel pipe 1, and the outer diameter of which is greater than the pipe diameter of the steel pipe 1. The end of the steel pipe 1 is provided with a connecting piece 3, and the outer end face of the connecting piece 3 is welded with a constraint ring with an L-shaped cross section. The outer end inner diameter of the constraint ring 4 is smaller than the inner diameter of the inner end, so that the constraint ring 4 and the connecting piece form a U-shaped annular groove.

[0037] The inner lining pipe end 5 (flange structure) is filled in the constraint ring 4, and the circumferential side of the inner lining pipe end 5 extends to the annular groove, so that the constraint rings 4 at both ends of the steel pipe can fix the inner lining pipe 2, prevent the position of the inner lining pipe 2 from changing, cooperate with the adhesive resin layer 7, ensure the stability of the inner lining pipe 2 during fluid conveying, and prevent the problem of delamination during pipe operation.

[0038] The recess is formed between the outer side end surface of the inner liner pipe end 5 and the inner side of the constraint ring 4, and is used for arranging the sealing gasket 6, the outer diameter of the sealing gasket 6 is matched with the inner diameter of the outer end of the constraint ring 4, and the inner diameter of the sealing gasket 6 is the same as the inner diameter of the inner liner pipe, so as to ensure the consistency of the internal flow diameter of the composite pipe. The sealing gasket 6 mainly plays a high-pressure sealing role. The formed recess plays a positioning effect for the sealing gasket, so as to improve the installation precision and prevent the sealing gasket 6 from being displaced under high pressure to cause the problem of pipeline pressure relief.

[0039] The connecting piece 3 is welded with the steel pipe 1, the connecting piece 3 can be a flange or a stop ring of a movable disc flange, mainly plays a role of connecting the composite pipe, the connecting piece 3 is a metal material, and the size (thickness, hole number and hole distance) of the connecting piece is designed according to the design standard of the related flange. The constraint ring 4 is the same part as the connecting piece 3, and is a metal material. The outer diameter of the connecting piece is greater than the outer diameter of the inner liner pipe end 5, so as to facilitate the mutual connection between adjacent pipelines, after connection, the sealing gasket 6 is pressed tightly, the inner liner pipe end 5 is directly processed by using the structure of the inner liner pipe 2, and cooperates with the sealing gasket 6, so that the problem that the high-pressure fluid penetrates the composite interface of the steel pipe and the inner liner pipe can be effectively avoided.

[0040] The steel pipe 1 of the embodiment has small temperature reduction influence on its own pressure bearing capacity, so the upper limit use temperature of the product is designed according to the melting point and softening point data of the lining material, generally not more than 70 DEG C, and the problem that the upper limit temperature of the pipeline use is low due to the pressure temperature reduction problem of the plastic pipeline does not need to be considered.

[0041] The overall pipeline fixed-length design can be designed and customized, is flexible in design, and can realize, for example, 18 m / rod design to reduce the joint cost and improve the pipeline connection efficiency.

[0042] The above only describes preferred embodiments of the utility model, and is not used for limiting the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A steel lined multilayer composite abrasion resistant pipe, characterized in that, The steel pipe and the inner lining pipe in the steel pipe, the inner lining pipe from inside to outside is modified wear-resistant layer, polyethylene layer and adhesive resin layer, the inner lining pipe end is the flanging structure formed by extending to the outside of the steel pipe end, the plane where the inner lining pipe end is located is perpendicular to the pipeline axis to ensure the consistency of the pipeline flow diameter; the adhesive resin layer uses maleic anhydride grafting modified polyethylene.

2. A steel lined multilayer composite abrasion resistant pipe according to claim 1, characterized in that, The polyethylene layer is high-density polyethylene resin, so that the modified wear-resistant layer, the polyethylene layer and the adhesive resin layer form a trinity structure.

3. A steel lined multilayer composite abrasion resistant pipe according to claim 2, characterized in that, The polyethylene layer is integrated with the steel pipe through the adhesive resin layer, and the modified wear-resistant layer is made of high wear-resistant polyolefin pipeline special material.

4. A steel-lined, multilayer composite, abrasion-resistant pipe, as claimed in claim 1, wherein, The outer surface of the steel pipe is coated and painted with corrosion-resistant film.

5. A steel-lined, multilayer composite, abrasion-resistant pipe, as claimed in claim 1, wherein, The inner lining pipe end is annular structure, one side of which abuts against the end of the steel pipe, and the outer diameter of which is larger than the pipe diameter of the steel pipe.

6. A steel-lined, multilayer composite, abrasion-resistant pipe according to claim 5, characterized in that, The end of the steel pipe is provided with a connecting piece, one end of the connecting piece is provided with a constraint ring with L-shaped cross section.

7. A steel lined multilayer composite abrasion resistant pipe according to claim 6, characterized in that, The flanging structure of the inner lining pipe end is filled in the constraint ring.

8. A steel lined multilayer composite abrasion resistant pipe according to claim 7, characterized in that, The end face of the inner lining pipe end is provided with a sealing rubber gasket.

9. A steel lined multilayer composite abrasion resistant pipe according to claim 8, characterized in that, The outer diameter of the sealing rubber gasket is matched with the inner diameter of the constraint ring, and the inner diameter of the sealing rubber gasket is the same as the inner diameter of the inner lining pipe.

10. A steel-lined, multilayer composite, abrasion-resistant pipe according to claim 6, characterized in that, The connecting piece is a flange structure, and the outer diameter of the connecting piece is larger than the outer diameter of the inner lining pipe end.

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