CN114877168A

CN114877168A - Rib-type coupled wear-resistant composite lining repairing pipe and lining repairing method

Info

Publication number: CN114877168A
Application number: CN202210518790.7A
Authority: CN
Inventors: 褚展鹏; 刘跃明; 霍福磊; 陈江慧; 李鹏
Original assignee: Linhai Weixing New Building Materials Co Ltd; Zhejiang Weixing New Building Materials Co Ltd
Current assignee: Linhai Weixing New Building Materials Co Ltd; Zhejiang Weixing New Building Materials Co Ltd
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-08-09
Anticipated expiration: 2042-05-13
Also published as: CN114877168B

Abstract

The invention discloses a rib-coupled wear-resistant composite lining repairing pipe and a lining repairing method, wherein the pipe comprises an inner layer and an outer layer, the inner wall of the inner layer is a smooth annular wall surface, a plurality of groove structures arranged along the axial direction are arranged on the outer wall of the inner layer along the circumferential direction of the outer wall, a rib structure is formed between every two adjacent groove structures on the outer wall of the inner layer, and the outer layer covers the groove structures of the inner layer and the peripheries of the rib structures. The lining repair pipe inner layer is prepared by polyolefin elastomer wear-resistant material Si-TPE by adopting a high-molecular advanced modification technology, has excellent wear-resistant performance and processability, and has a wear-resistant mechanism that the material characteristics of the elastomer are applied, and the impact and cutting of solid particles on the pipe inner surface are buffered through elastic deformation, so that the lining repair pipe inner layer can be better suitable for conveying solid-liquid two-phase media.

Description

Rib-type coupled wear-resistant composite lining repairing pipe and lining repairing method

Technical Field

The invention relates to the field of lining repairing pipelines, in particular to a rib-type coupled wear-resistant composite lining repairing pipe and a lining repairing method.

Background

The traditional repairing lining pipe is mainly characterized in that a single PE solid-wall pipe is lined in a steel pipe or a pipe to be repaired to achieve multiple functions of blocking, repairing, corrosion prevention and the like, but the erosion effect of the medium in the pipe on the pipe needs to be considered when the plastic pipe is used in special application fields, such as the conveying of solid-liquid two-phase ore pulp, silt and water-coal-slurry, and the common plastic pipe is difficult to adapt to the long-term use requirement.

Although the requirements of individual working conditions can be met for some composite lining pipelines added with functional layers, the deformation of the pipe in the subsequent lining construction process is large, so that higher requirements are provided for the composite strength among different functional layers of the pipe.

Traditional inside lining pipe is when using lining processes such as pressing U or undergauge, and original pipeline outer wall can produce the vertical fish tail of certain form to the tubular product outer wall, and this kind of destruction is very serious under the partial condition, consequently to lining pipe's each item mechanical properties: higher requirements are put on the resistance to cracking stress, yield strength, tensile strength and elongation at break.

After the lining is finished, part of the traditional lining pipe can be collapsed under the stretching and bending actions after working for a period of time, so that the lining pipe has good deformation processing capacity, and a certain rigidity supporting action is required after the lining is finished.

At present in inside lining repair pipe way field, main inside lining pipeline is plastic conduit, but traditional inside lining pipeline material is single, and the non-functional layer can't be adapted to multiple application operating mode, and single structure can't be applicable to multiple construction operating mode, has a great deal of pain point, has consequently designed a novel functional, the diversified inside lining of structure and has repaired the pipe.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a rib type coupled wear-resistant composite lining repairing pipe and a lining repairing method which are reasonable in design.

The technical scheme of the invention is as follows:

the utility model provides a wear-resisting compound inside lining restoration pipe of rib formula coupling, includes inlayer and skin, the inner wall of inlayer is glossy annular wall, the outer wall of inlayer is equipped with a plurality of groove structure that set up along the axial along its circumferencial direction, just form rib structure on the outer wall of inlayer between two adjacent groove structure, the outer cladding is in the periphery of the groove structure of inlayer and rib structure.

Furthermore, the inner layer is made of polyolefin elastomer wear-resistant material, and the outer layer is made of PE material.

Further, groove structure is the U type, be the plane in the middle of groove structure's the bottom surface, both ends are equipped with chamfer A respectively to form the trapezoidal bottom surface of falling.

Furthermore, the rib structure is the type of falling U, be the plane in the middle of the top surface of rib structure, both ends are equipped with chamfer B respectively to form the trapezoidal top surface of falling.

Further, the number of the rib structures is 10-20.

Furthermore, the inner layer and the outer layer are formed integrally by co-extrusion.

A lining repair method of a rib type coupled wear-resistant composite lining repair pipe comprises the following steps:

1) the inner layer material and the outer layer material are respectively measured according to the formula requirements, mixed in a high-speed mixer, sieved and then fed into a double-screw extruder, and the raw materials are plasticized to be in a molten state; extruding a core pipe through a double-layer co-extrusion die, then realizing the rib structure forming of the core pipe, then coating the outer layer, carrying out vacuum sizing, extruding the formed pipe blank, and cutting for later use after the pipe blank is formed through a water cooling box;

2) after the inner surface of the lining pipe is treated, firstly, the inner surface of the steel pipe is preliminarily cleaned by an organic solvent, the possibly residual scraps and grease on the inner surface are removed, the purposes of rust removal and roughness reservation are achieved through shot blasting or sand blasting, and the lining pipe is reserved after treatment;

3) carrying out a lining process by adopting a U pressing process or a reducing process;

4) after the lining is finished, the joint needs to be processed, a flanging flange process is used for a lining core pipe with the wall thickness of less than 15mm, and a flanging coupling is used for the wall thickness of more than 15 mm.

Further, the U pressing process in the step 3) comprises the following steps:

pressing U of the pipe processed in the step 1) along the bottom surface of the groove structure in the direction perpendicular to the normal line by using a U pressing machine in advance, wherein the size of the U is 90% -95% of the inner diameter of the pipe to be lined processed in the step 2); uniformly winding bandages at intervals of 0.5-1m according to the length of the required lining, gradually putting the bandages into the steel pipe, and loosening the wound bandages in sequence to enable the lining repairing pipe to rebound and cling to the inner wall to discharge air, so that the lining is finished.

Further, the diameter reducing process comprises the following steps:

reducing the diameter of the pipe processed in the step 1) by a reducing machine or a reducing mould, wherein the reducing amount is controlled to be 5-10% of the external diameter of the original pipe; adjusting the distance between the diameter reducing machine or the diameter reducing mold and the inlet of the pipe to be lined according to the speed of the diameter reducing machine, and immediately placing the pipe into the steel pipe after diameter reduction, wherein the interval is not more than 30 s; a winch is added at the reducing head to help the inner lining core pipe to enter, but a clamping part needs to be reserved and cut off after the reducing is finished.

Further, double-deck crowded mould altogether includes bush, mandrel and crowded mould altogether, crowded mould altogether sets up in the bush outside, and is close to the setting of mould exit end, crowded mould altogether includes the mould body, crowded runner altogether and takes the chamfer protruding, it is protruding to set up a plurality of along bush inner wall circumferencial direction to take the chamfer, and extends along taking the chamfer protruding along extrusion direction, be equipped with the crowded entry altogether with crowded runner intercommunication on the mould body, take the bellied rib groove of chamfer and crowd the runner intercommunication with crowded altogether, crowded inner wall of runner adopts helical structure altogether, guarantees that each rib groove exports the discharge even.

The invention has the following beneficial effects:

1) the lining repair pipe inner layer is prepared by polyolefin elastomer wear-resistant material Si-TPE by adopting a high-molecular advanced modification technology, has excellent wear-resistant performance and processability, and has a wear-resistant mechanism that the material characteristics of the elastomer are applied, and the impact and cutting of solid particles on the pipe inner surface are buffered through elastic deformation, so that the lining repair pipe inner layer can be better suitable for conveying solid-liquid two-phase media.

2) The inner layer and the outer layer of the pipe are not circular arc combination interfaces, and the combination strength of the inner layer and the outer layer is greatly increased by designing the combination interfaces in staggered rib coupling, so that the layering and the peeling of different functional layers in the construction and use processes are effectively prevented.

3) The polyolefin elastomer wear-resistant material adopted by the inner layer has the tensile strength of more than 20Mpa, the elongation at break of more than 600 percent and the low-temperature impact embrittlement temperature of less than minus 40 ℃, can meet the extreme working conditions in various constructions, and avoids influencing the lining effect.

4) The lining repair pipe has the unique ribbed plate staggered design, so that the U can be pressed more easily, the rigidity requirement of the lining pipe is effectively enhanced through the form of the reinforcing ribs, and the phenomena of inner pipe collapse and the like after the lining is finished are effectively avoided.

5) The invention provides a rib-type coupled wear-resistant composite lining repairing pipe which has the advantages of more convenient lining, high bonding strength, good resilience and cracking resistance, large rigidity after molding and the like.

Drawings

FIG. 1 is a schematic three-dimensional structure of a liner repair tube according to the present invention;

FIG. 2 is a schematic cross-sectional view of a liner repair tube according to the present invention;

FIG. 3 is a schematic view of the overall structure of the mold of the present invention;

FIG. 4 is a schematic view of the end face structure of the coformer of the present invention;

FIG. 5 is a schematic view of the internal structure of the co-agent mold of the present invention;

in the figure: 1. an inner layer; 101. chamfering A; 102. a groove structure; 2. an outer layer; 201. chamfering B; 202. a rib structure; 3. co-extrusion molding; 301. a mold body; 302. a co-extrusion inlet; 303. a helical structure; 304. co-extruding a flow channel; 305. a rib groove; 306. a protrusion with a chamfer; 4. a neck ring mold; 5. and (4) forming a core mould.

Detailed Description

The invention is further explained below with reference to the drawings and the examples.

As shown in fig. 1-5, a rib-coupled wear-resistant composite lining repair pipe mainly comprises an outer layer 2 (a PE coating layer) and an inner layer 1 (a polyolefin elastomer wear-resistant material layer).

The polyolefin elastomer wear-resistant material layer of the inner layer 1 is made of a silicon-modified TPE material, is chemically stable, corrosion-resistant and excellent in wear resistance, is 5 times and 10 times that of a steel pipe and 2-3 times that of an ultrahigh pipe, is suitable for various media, and is low in surface roughness and excellent in hydraulic performance. The technical parameters of the raw materials are as follows: density 0.9g/cm ³ The melt index (190 ℃,2.16 kg) is 0.5g/10min, the tensile strength is more than 20Mpa, the elongation at break is more than 600 percent, and the low-temperature impact embrittlement temperature is less than minus 40 ℃. Outer 2 adopts the PE coating to play protection and isolated effect to pass through rib shape coupling with polyolefin elastomer wearing material layer and promote overall structure rigidity, PE is also fine with modified TPE material chemical compatibility, only needs high temperature melting to combine and does not need extra hot melt adhesive.

Structurally, groove structure 102 has mainly made things convenient for the process of pressing the U, compares with traditional solid-wall pipe, presses the U better from groove structure department, and presses groove structure and both sides rib structure edge formation inner chamber behind the U, has guaranteed again through the inner chamber compression that kick-backs that tubular product can have better resilience performance after pressing the U, and can be better avoid the deformation of resilience back cross-section. The groove structure chamfer A101 and the rib structure chamfer B201 have the main functions of forming a smooth transition inverted-trapezoidal combination interface between the inner layer and the outer layer and avoiding the phenomenon of stress concentration caused by sharp points. The bottom plane of the groove structure 102 and the bottom plane of the rib structure 202 mainly serve to enhance the rigidity of the pipe, and can play a certain supporting role after the repair is completed, so that the collapse of the repair inner pipe under the action of certain force or moment is prevented.

A lining repair method of a rib type coupled wear-resistant composite lining repair pipe comprises the following specific steps:

firstly, respectively metering a polyolefin elastomer wear-resistant material and a PE material according to the formula requirements, mixing the materials in a high-speed mixer, sieving the materials, and then feeding the materials into a double-screw extruder to plasticize the materials into a molten state; the core pipe is firstly extruded through the double-layer co-extrusion die, then the rib-shaped structure of the core pipe is realized, the size of the specific die is shown in the table I, the size of a rib unit of a U pressing method is larger, the U pressing forming is convenient, the number of the rib units of a reducing method is smaller, and the interlayer binding force is strengthened. Then coating the outer layer, carrying out vacuum sizing, extruding the formed pipe blank, shaping by a water cooling box, and cutting for later use.

Specifically, double-deck crowded mould altogether includes bush 4, mandrel 5 and crowded mould 3 altogether, crowded mould 3 sets up in the 4 outsides of bush altogether, and be close to the setting of mould exit end, crowded mould 3 altogether includes mould body 301, crowded runner 304 altogether and take the chamfer arch 306, take the protruding 306 bead of chamfer to set up a plurality of along 4 inner wall circumferencial directions of mouth mould, and extend along taking the protruding 306 edge extrusion direction of chamfer, be equipped with on the mould body 301 with crowded runner 304 intercommunication altogether crowded entry 302 altogether, take the rib groove 305 on the protruding 306 intercommunication of chamfer and crowd runner 304 with crowded runner, crowded runner 304's inner wall adopts heliciform structure 303 altogether, make outer cladding material fully flow wherein, guarantee that each rib groove 305 exports the discharge even. The chamfered protrusions 306 (with rounded protrusions) reduce the flow resistance to the flowing base material and form a runner cavity, and the rib shapes with different cross sections are realized through the design of various co-extrusion strip channel shapes.

Table one:

lining process	Number of repeating rib units	Size of chamfer
			U pressing method	10 to 15	5~10mm
Diameter reduction method	15 to 20	2~5mm

And step two, treating the inner surface of the pipe to be lined. For example, a steel pipe is first cleaned with an organic solvent (e.g., acetone) to remove any debris and grease that may remain on the inner surface. The purposes of rust removal and roughness reservation are achieved through shot blasting or sand blasting, and the steel plate is reserved after treatment.

And step three, lining.

If a U pressing process is adopted, a U pressing machine is used for pressing U on the pipe processed in the first step along the direction of the vertical normal line of 1-2 in advance, the size of the U is 90% -95% of the inner diameter of the steel pipe processed in the second step, the subsequent resilience performance is easily influenced when the U pressing amount is too large, and the pipe is not easily lined when the U pressing amount is too small. Uniformly winding bandages at intervals of 0.5-1m according to the length of the required lining, gradually putting the bandages into the steel pipe, and sequentially loosening the wound bandages to enable the inner pipe to rebound and cling to the inner wall to discharge air, so that the lining is finished.

If a diameter reducing process is adopted, the pipe processed in the step one is subjected to diameter reduction through a diameter reducing machine or a diameter reducing die, the diameter reduction amount is controlled to be 5-10% of the outer diameter of the original pipe, and the diameter reduction effect can be influenced when the diameter reduction amount is too large or too small. Because the polyolefin elastomer wear-resistant material of the inner layer has good rebound resilience, the material is immediately placed into a steel pipe after reducing, the interval cannot be more than 30s, and the distance between a reducing machine or a reducing mould and the inlet of the steel pipe can be adjusted according to the speed of the reducing machine to meet the requirement. Further, the diameter reduction may be performed twice, but it is preferable that the diameter reduction is not performed more than twice, if it fails in one operation. The reducing head can be added with a winch to help the inner pipe enter, but a certain clamping part is reserved and cut off after the reducing is finished.

And step four, after the lining is finished, the joint needs to be processed, the lining core pipe with the wall thickness of less than 15mm can use a flanging flange process, the wall thickness of more than 15mm is thick, and a scheme of flanging a coupling can be adopted.

The present examples are not intended to be limiting and it is apparent to those skilled in the art that the present invention may be variously modified and changed. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a wear-resisting compound inside lining restoration pipe of rib formula coupling, includes inlayer (1) and skin (2), its characterized in that, the inner wall of inlayer (1) is smooth annular wall, the outer wall of inlayer (1) is equipped with a plurality of groove structure (102) that set up along the axial along its circumferencial direction, just form rib structure (202) on the outer wall of inlayer (1) between adjacent two groove structure (102), outer (2) cladding is in the periphery of groove structure (102) and rib structure (202) of inlayer (1).

2. A ribbed coupled wear resistant composite lined rehabilitating pipe according to claim 1, wherein the inner layer (1) is of polyolefin elastomer wear resistant material and the outer layer (2) is of PE material.

3. The ribbed, coupled, wear-resistant composite liner repair tube of claim 1, wherein the groove structure (102) is U-shaped, and the groove structure (102) has a flat bottom surface in the middle and chamfers a (101) at both ends to form an inverted trapezoidal bottom surface.

4. A rib-coupled wear-resistant composite liner repair tube according to claim 1, wherein the rib structure (202) is of an inverted U-shape, the top surface of the rib structure (202) is flat in the middle, and chamfers B (201) are respectively provided at both ends, so as to form an inverted trapezoidal top surface.

5. A rib-coupled wear resistant composite innerliner repair tube as claimed in claim 1, wherein there are 10-20 of said rib structures (202).

6. The ribbed coupled wear-resistant composite lined rehabilitating pipe according to claim 1, wherein the inner layer (1) and the outer layer (2) are integrally formed by co-extrusion.

7. A lining repairing method for a rib-type coupled wear-resistant composite lining repairing pipe is characterized by comprising the following steps:

8. The method for repairing the inner lining of the rib-coupled wear-resistant composite lining repair pipe according to claim 7, wherein in the step 3), the U pressing process comprises the following steps:

9. The method of claim 7, wherein the reducing comprises the steps of:

10. The method for repairing the inner lining of the rib-coupled wear-resistant composite lining repair pipe according to claim 7, wherein the double-layer co-extrusion mold comprises a neck mold (4), a core mold (5) and a co-extrusion mold (3), the co-extrusion mold (3) is arranged outside the neck mold (4) and close to the outlet end of the mold, the co-extrusion mold (3) comprises a mold body (301), a co-extrusion flow channel (304) and a protrusion with a chamfer (306), a plurality of the protrusions with the chamfer (306) are arranged along the circumferential direction of the inner wall of the neck mold (4), the protrusions with the chamfer (306) extend along the extrusion direction, the mold body (301) is provided with a co-extrusion inlet (302) communicated with the co-extrusion flow channel (304), a rib groove (305) on the protrusion with the chamfer (306) is communicated with the co-extrusion flow channel (304), the inner wall of the co-extrusion flow channel (304) adopts a spiral structure (303), the discharge amount of the outlet of each rib groove (305) is ensured to be uniform.