CN114877168B - Rib-type coupled wear-resistant composite lining repairing pipe and lining repairing method - Google Patents

Abstract

The invention discloses a rib-type 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 which are axially arranged are arranged on the outer wall of the inner layer along the circumferential direction of the inner layer, a rib structure is formed between two adjacent groove structures on the outer wall of the inner layer, and the outer layer is coated on the groove structures of the inner layer and the periphery of the rib structure. The inner layer of the lining repairing pipe is prepared from a polyolefin elastomer wear-resistant material Si-TPE by adopting a high-molecular advanced modification technology, has excellent wear resistance and processability, adopts the wear-resistant mechanism of the elastomer, is characterized by the application of the elastomer material, and can buffer the impact and cutting of solid particles on the inner surface of the pipe through elastic deformation, thereby being 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 repair pipelines, in particular to a rib-type coupled wear-resistant composite lining repair pipe and a lining repair method.

Background

The traditional repair lining pipe is mainly formed by lining a single PE solid wall pipe in a steel pipe or a pipe to be repaired, so that various functions such as blocking, repairing and corrosion prevention are achieved, but when the plastic pipe is used in some special application fields, such as conveying of solid-liquid two-phase ore pulp, silt and coal water slurry, the erosion effect of the pipe medium in the pipe is required to be considered, and the common plastic pipe is difficult to adapt to the long-term use requirement.

For some composite lining pipelines added with functional layers, although the requirements of individual working conditions can be met, the deformation of the pipe is larger in the subsequent lining construction process, so that higher requirements are put forward for the composite strength of different functional layers of the pipe.

When the traditional lining pipe is used for lining processes such as U pressing or diameter reduction, the original outer wall of the pipeline can produce a certain form of longitudinal scratch on the outer wall of the pipeline, and the damage is very serious under partial conditions, so that the traditional lining pipe has various mechanical properties for the lining pipe: the resistance to cracking stress, yield strength, tensile strength and elongation at break are more demanding.

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

At present, in the field of lining repair pipelines, a main lining pipeline is a plastic pipeline, but the traditional lining pipeline is single in material and cannot be suitable for various application working conditions, and the structure is single, so that various pain points exist, and a novel lining repair pipe with functions and diversified structures is designed.

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.

The technical scheme of the invention is as follows:

the utility model provides a rib-type coupled wear-resisting composite lining repair tube, includes inlayer and skin, the inner wall of inlayer is smooth annular wall, the outer wall of inlayer is equipped with a plurality of groove structure along the axial setting along its circumferencial direction, just form rib structure on the outer wall of inlayer between two adjacent groove structure, the outer cladding is at the periphery of the groove structure and the rib structure of inlayer.

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

Further, the groove structure is U-shaped, the middle of the bottom surface of the groove structure is a plane, and chamfer angles A are respectively arranged at two ends of the groove structure, so that an inverted trapezoid bottom surface is formed.

Further, the rib structure is of an inverted U shape, the middle of the top surface of the rib structure is a plane, and chamfer angles B are respectively arranged at two ends of the rib structure, so that an inverted trapezoid top surface is formed.

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

Further, the inner layer and the outer layer are integrally formed by coextrusion.

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

1) The inner layer material and the outer layer material are respectively measured according to the formula requirement, are put into a high-speed mixer for mixing, are sieved and enter a double-screw extruder, and the raw materials are plasticized into a molten state; extruding the core tube through a double-layer co-extrusion die, forming a rib structure of the core tube, coating an outer layer, sizing in vacuum, extruding a formed pipe blank, shaping through a water cooling box, and cutting for later use;

2) After the inner surface of the lining pipe is treated, firstly, the inner surface of the steel pipe is primarily cleaned by using an organic solvent, and the possible residual scraps and grease on the inner surface are removed, and the purposes of rust removal and roughness reservation are achieved through shot blasting or sand blasting, and the steel pipe is ready for use after the treatment is completed;

3) The lining process is carried out by adopting a U pressing process or a diameter reducing process;

4) After the lining is finished, the joint needs to be treated, a flanging flange process is adopted for lining core pipes with the wall thickness of less than 15mm, and a flanging coupling is adopted for the wall thickness of more than 15 mm.

Further, the medium-pressure U process in the step 3) comprises the following steps:

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

Further, the diameter reduction process comprises the following steps:

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

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

The beneficial effects of the invention are as follows:

1) The inner layer of the lining repairing pipe is prepared from a polyolefin elastomer wear-resistant material Si-TPE by adopting a high-molecular advanced modification technology, has excellent wear resistance and processability, adopts the wear-resistant mechanism of the elastomer, is characterized by the application of the elastomer material, and can buffer the impact and cutting of solid particles on the inner surface of the pipe through elastic deformation, thereby being better suitable for conveying solid-liquid two-phase media.

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

3) The tensile strength of the polyolefin elastomer wear-resistant material adopted by the inner layer is more than 20Mpa, the elongation at break is more than 600%, the low-temperature impact embrittlement temperature is less than-40 ℃, the extreme working conditions in various constructions can be met, and the influence on the lining effect is avoided.

4) The lining repairing pipe has unique rib 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 completed are effectively avoided.

5) The rib-type coupled wear-resistant composite lining repairing pipe provided by the invention has the advantages of more convenience in lining, high bonding strength, good rebound performance and cracking resistance, high rigidity after molding and the like.

Drawings

FIG. 1 is a schematic view of a 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 according to the present invention;

FIG. 4 is a schematic diagram of an end face structure of a co-agent mold according to 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 die; 301. a die body; 302. a coextrusion inlet; 303. a helical structure; 304. co-extrusion flow channels; 305. rib grooves; 306. a chamfer bulge is arranged; 4. a die; 5. and (5) a core mold.

Detailed Description

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

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

The inner layer 1 polyolefin elastomer wear-resistant material layer is a TPE material modified by silicon, is chemically stable, corrosion-resistant and excellent in wear resistance, is 5 x 10 times of a steel pipe, is 2-3 times of an ultrahigh pipe, is suitable for various media, and is low in surface roughness and excellent in hydraulic performance. Technical parameters of raw materials: density of 0.9g/cm ³ The melting point (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-40 ℃. The PE coating layer is adopted as the outer layer 2 to play a role in protection and isolation, the PE and the modified TPE material are well chemically compatible, and the PE and the modified TPE material are only fused and combined at high temperature without additional hot melt adhesive, so that the rigidity of the whole structure is improved through rib coupling with the polyolefin elastomer wear-resistant material layer.

Structurally, the groove structure 102 mainly facilitates the process of pressing U, and compared with a traditional solid wall pipe, the U is better pressed from the groove structure, an inner cavity is formed between the groove structure and the edges of the two-side rib structures after the U is pressed, the pipe can have better rebound performance after the U is pressed through inner cavity compression and rebound, and the deformation of the section after the rebound can be better avoided. The groove structure chamfer A101 and the rib structure chamfer B201 are mainly used for forming a smooth transition inverted trapezoid-shaped combination interface between the inner layer and the outer layer, and avoid 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 repair is completed, so that the collapse of the inner pipe can be prevented from being repaired under the action of certain force or moment.

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

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

Specifically, the double-layer co-extrusion die comprises a die 4, a core die 5 and a co-extrusion die 3, wherein the co-extrusion die 3 is arranged on the outer side of the die 4 and is close to the die outlet end, the co-extrusion die 3 comprises a die body 301, a co-extrusion runner 304 and a chamfer protrusion 306, the chamfer protrusion 306 is arranged in a plurality along the circumferential direction of the inner wall of the die 4, the chamfer protrusion 306 extends along the extrusion direction, a co-extrusion inlet 302 communicated with the co-extrusion runner 304 is arranged on the die body 301, a rib groove 305 on the chamfer protrusion 306 is communicated with the co-extrusion runner 304, and the inner wall of the co-extrusion runner 304 adopts a spiral structure 303, so that an outer coating material flows fully in the spiral structure, and the outlet discharge quantity of each rib groove 305 is ensured to be uniform. The chamfered protrusion 306 (with rounded protrusion) reduces the flow resistance to the flow matrix material and forms a flow channel cavity, and rib shapes of different shape cross sections are achieved by the design of various co-extruded strip channel shapes.

Table one:

lining process	Number of repeating rib units	Chamfer size
			U-pressing method	10-15	5~10mm
Diameter reduction method	15-20	2~5mm

And step two, treating the inner surface of the lining pipe. Taking a steel pipe as an example, the inner surface is first preliminarily cleaned with an organic solvent (such as acetone) to remove possible residual scraps and grease on the inner surface. The purposes of rust removal and roughness reservation are achieved through shot blasting or sand blasting, and the treatment is finished for later use.

And step three, lining.

If the U pressing process is adopted, a U pressing machine is used in advance to press the pipe processed in the first step along the vertical normal direction of 1-2, the U pressing size reaches 90% -95% of the inner diameter of the steel pipe processed in the second step, the follow-up rebound resilience performance is easily affected when the U pressing amount is too large, and the pipe is not easily lined in when the U pressing amount is too small. According to the length of the required lining, uniformly winding bandages at intervals of 0.5-1m, gradually putting the bandages into a steel pipe, and sequentially loosening the wound bandages, so that the inner pipe rebounds to be stuck on the inner wall to discharge air, and the lining is completed.

If the diameter reducing process is adopted, the pipe processed in the first step is reduced by a diameter reducing machine or a diameter reducing die, the diameter reducing amount is controlled to be 5-10% of the original outer diameter of the pipe, and the diameter reducing effect is affected by the fact that the diameter is too large or too small. Because the rebound resilience of the inner polyolefin elastomer wear-resistant material is good, the inner polyolefin elastomer wear-resistant material should be put into a steel pipe immediately after diameter reduction, the interval cannot be more than 30s, and the distance between the diameter reducer or the diameter reducing die and the inlet of the steel pipe can be adjusted according to the speed of the diameter reducer to meet the requirement. In addition, the primary operation failure of the diameter reduction may be performed by a secondary diameter reduction, but it is preferable not to exceed twice. A winch can be added to the diameter reducing head to help the inner pipe to enter, but a certain clamping part is reserved and cut off after diameter reduction is completed.

And step four, the joint is required to be treated after the lining is finished, a flanging flange process can be used for lining core pipes with the wall thickness of less than 15mm, the wall thickness of more than 15mm is thicker, and a flanging coupling scheme can be adopted.

The examples of the present invention are not limited to the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are within the protection scope of the present invention.

Claims (5)

1. The lining repairing method of the rib-type coupled wear-resistant composite lining repairing pipe is characterized in that the inner wall of the inner layer (1) is a smooth annular wall surface, a plurality of groove structures (102) which are axially arranged are arranged on the outer wall of the inner layer (1) along the circumferential direction of the inner wall, rib structures (202) are formed between two adjacent groove structures (102) on the outer wall of the inner layer (1), and the outer layer (2) is coated on the peripheries of the groove structures (102) and the rib structures (202) of the inner layer (1); the inner layer (1) is made of polyolefin elastomer wear-resistant materials, and the outer layer (2) is made of PE materials; the groove structure (102) is U-shaped, the middle of the bottom surface of the groove structure (102) is a plane, and both ends of the groove structure are respectively provided with a chamfer A (101), so that an inverted trapezoid bottom surface is formed; the rib structure (202) is in an inverted U shape, the middle of the top surface of the rib structure (202) is a plane, and chamfer angles B (201) are respectively arranged at two ends of the rib structure, so that an inverted trapezoid top surface is formed;

the lining repairing method comprises the following steps:

1) The inner layer material and the outer layer material are respectively measured according to the formula requirement, are put into a high-speed mixer for mixing, are sieved and enter a double-screw extruder, and the raw materials are plasticized into a molten state; extruding the core tube through a double-layer co-extrusion die, forming a rib structure of the core tube, coating an outer layer, sizing in vacuum, extruding a formed pipe blank, shaping through a water cooling box, and cutting for later use;

the double-layer co-extrusion die comprises a die (4), a core die (5) and a co-extrusion die (3), wherein the co-extrusion die (3) is arranged outside the die (4) and close to the die outlet end, the co-extrusion die (3) comprises a die body (301), a co-extrusion runner (304) and a chamfer-carrying protrusion (306), a plurality of chamfer-carrying protrusions (306) are arranged along the circumferential direction of the inner wall of the die (4) and extend along the extrusion direction along the chamfer-carrying protrusion (306), a co-extrusion inlet (302) communicated with the co-extrusion runner (304) is formed in the die body (301), rib grooves (305) on the chamfer-carrying protrusions (306) are communicated with the co-extrusion runner (304), and the inner wall of the co-extrusion runner (304) adopts a spiral structure (303) to ensure that the outlet discharge amount of each rib groove (305) is uniform;

2) After the inner surface of the lining pipe is treated, firstly, the inner surface of the steel pipe is primarily cleaned by using an organic solvent, and the possible residual scraps and grease on the inner surface are removed, and the purposes of rust removal and roughness reservation are achieved through shot blasting or sand blasting, and the steel pipe is ready for use after the treatment is completed;

3) The lining process is carried out by adopting a U pressing process or a diameter reducing process;

4) After the lining is finished, the joint needs to be treated, a flanging flange process is adopted for lining core pipes with the wall thickness of less than 15mm, and a flanging coupling is adopted for the wall thickness of more than 15 mm.

2. A rib-coupled wear-resistant composite liner repair method of a pipe liner repair according to claim 1, wherein the rib structures (202) are provided in an amount of 10-20.

3. The rib-coupled abrasion-resistant composite lining repairing pipe lining repairing method according to claim 1, wherein the inner layer (1) and the outer layer (2) are integrally formed by coextrusion.

4. The rib-coupled lining repair method for a wear-resistant composite lining repair pipe according to claim 1, wherein the medium-pressure U process in the step 3) comprises the following steps:

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

5. The rib-coupled wear-resistant composite lining repair pipe lining repair method according to claim 1, wherein the reducing process comprises the following steps:

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