CN212929042U - Interior bushing pipe connection structure, interior bushing pipe and material conveying pipeline - Google Patents

Abstract

The utility model provides a bushing pipe connection structure, bushing pipe and material conveying pipeline. The inner lining pipe connecting structure comprises a first connecting part formed on a first inner lining pipe, the first connecting part is positioned at one end of the first inner lining pipe, and the first connecting part comprises a boss which is formed on an inner layer and a part of middle layer of the first inner lining pipe and protrudes outwards along the axial direction compared with the outer layer and the other part of middle layer of the first inner lining pipe; the second connecting part is formed on one end of the second lining pipe and comprises a groove which is formed on the inner layer and a part of the middle layer of the second lining pipe and is recessed inwards along the axial direction compared with the outer layer and the other part of the middle layer; when the first lining pipe and the second lining pipe are connected, the lug boss is matched with the groove in size, and the first connecting portion and the second connecting portion can be spliced together. Through the cooperation of boss and groove structure, conveniently realize the union coupling in a plurality of linings, guarantee that the lining pipe receives shear force effect time connection more firm.

Description

Interior bushing pipe connection structure, interior bushing pipe and material conveying pipeline

Technical Field

The utility model relates to a HIsmelt material transport technical field especially relates to a lined pipe connection structure in, lined pipe and material pipeline.

Background

The HIsmelt reduction technology is a metallurgical technology without coke, sintering and pelletizing processes, has obvious process advantages, technical significance and industrial application prospects in the aspects of energy conservation and environmental protection, resource utilization, energy expansion, product remodeling, process innovation and the like in the metallurgical industry, and is one of important high and new technologies in the metallurgical industry at present. In the HIsmelt reduction technology, materials such as iron ore powder particles and the like need to be conveyed, the temperature of the materials is as high as 500 ℃ and 800 ℃, and the conveying speed is required to be more than 20 m/s.

Due to the particularity of the HIsmelt reduction process, solid materials such as iron ore powder with small particle size are conveyed, and the temperature and the speed are high during conveying. And the junction of the existing material conveying pipeline can not adapt to the working conditions. The existing material conveying pipelines are generally connected by welding or flanges. If the welding mode is adopted, only the outer surface of the pipeline can be welded, materials can enter the connecting part of the inner surface of the pipeline in the conveying process, so that the gap of the connecting part is larger and larger, and even the connecting part can be damaged. The pipeline adopts welded connection structure, can't satisfy the leakproofness requirement among the material transportation process. The flange type connection structure also has the problems, and is not suitable for flange connection due to the existence of the water-cooling copper sleeve outside the lining pipe. Meanwhile, the lining pipe adopts a multilayer composite pipeline and the wall thickness of the pipeline is thick. If the welding mode is adopted for connection, the welding groove is required to be large, the welding is difficult, the welding quality is not easy to guarantee, and the intermetallic combination of the welding area is not good. The existing welding technology is generally plane welding of the same material, and longitudinal welding of multiple materials at the joint of the lining pipe cannot be achieved in the prior art.

There is a need to develop a new type of liner connection, liner and material transfer piping suitable for HIsmelt reduction process, which overcomes and ameliorates one or more of the above-mentioned disadvantages in the prior art, or at least provides an effective alternative to solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

To foretell not enough, the utility model provides a lined pipe connection structure, lined pipe and material pipeline in. The utility model provides a lining union coupling structure has ensured the leakproofness of lining union coupling effectively, has prevented that the material from boring to lead to lining union coupling to become invalid, can also make lining union coupling connect more firmly when receiving the effort simultaneously.

The utility model discloses a realize through following technical scheme:

an aspect of the embodiments of the present invention provides a bushing pipe connection structure, can be used for connecting bushing pipe in first bushing pipe and the second, a serial communication port, first bushing pipe with bushing pipe in the second comprises inlayer, intermediate level and skin, connection structure includes:

a first connection portion formed on the first lining pipe, the first connection portion being located at one end of the first lining pipe, the first connection portion including a boss formed on an inner layer and a part of an intermediate layer of the first lining pipe, the boss protruding outward in an axial direction compared with an outer layer and another part of the intermediate layer of the first lining pipe;

a second connection portion formed on the second liner pipe, the second connection portion being located at one end of the second liner pipe, the second connection portion including a groove formed in an inner layer and a part of an intermediate layer of the second liner pipe, the groove being recessed inward in an axial direction compared with an outer layer and another part of the intermediate layer of the second liner pipe;

when the first lining pipe is connected with the second lining pipe, the lug boss is matched with the groove in size, and the first connecting part can be spliced with the second connecting part.

In a preferred implementation of the lining tube connection structure, the outer layer and another part of the intermediate layer of the first connection portion can be connected with the outer layer and another part of the intermediate layer of the second connection portion by welding.

Another aspect of the embodiments of the present invention provides a lining pipe, wherein the lining pipe includes an inner layer, a middle layer and an outer layer, and the lining pipe at least has one of the first connecting portion and the second connecting portion as described in any one of the above.

In a preferred implementation of the inner liner tube, the inner layer is made of high-chromium cast iron, the intermediate layer is made of high-carbon steel and/or high-strength alloy steel, and the outer layer is made of stainless steel.

Further, the high-chromium cast iron comprises the following components: 1.5% -5%; mn: 0.8% -7%; cr: 15% -40%; 1 to 5 percent of Ni; 1.5 to 8 percent of Mo; 0 to 0.8 percent of V; 0.1 to 0.5 percent of Ti; 0-2% of B; cu: 0 to 1 percent; 0-1% of Al; the carbon content of the high-carbon steel is 0.1-1.0%.

In a preferred realization of the inner liner tube, the thickness of the inner layer is 35-50mm, the thickness of the intermediate layer is 15-25mm, and the thickness of the outer wall is 3-8 mm.

In a preferred implementation of the inner liner tube, the inner layer, the intermediate layer and the outer layer are formed by centrifugal casting.

The embodiment of the utility model provides a material conveying pipeline is still provided, wherein, including inner tube and outer tube, the inner tube comprises at least one above-mentioned arbitrary interior bushing pipe connection.

In a preferred implementation manner of the material conveying pipeline, when a plurality of lining pipes are connected, at the connection position, the inner layer and a part of the middle layer of the first connection part and the second connection part are in plug-in connection, and the outer layer and another part of the middle layer of the first connection part and the second connection part are in welded connection.

In a preferred implementation manner of the material conveying pipeline, the outer pipe adopts a water-cooling copper sleeve, the inner pipe exceeds the water-cooling copper sleeve by 100-300mm, and the end part of the inner layer of the lining pipe, which exceeds the water-cooling copper sleeve, of the inner pipe is provided with a sintering section.

Through the embodiment of the utility model provides a technical scheme can reach following beneficial effect:

(1) the embodiment of the utility model provides a bushing pipe connection structure in example can make bushing pipe in first and the second peg graft together through mutually supporting between the boss of first connecting portion and the recess of second connecting portion. The concave-convex matching connection mode can effectively ensure the sealing performance of the connection position of the lining pipes and prevent materials from penetrating into the connection position of the lining pipes; on the other hand, the mutual connection of a plurality of lining pipes can be realized quickly and conveniently, and the connection of the lining pipes is ensured to be firmer when the connection part of the lining pipes is under the action of shearing force.

(2) The embodiment of the utility model provides an example interior bushing pipe connection structure, the skin of first connecting portion and second connecting portion adopts the welded mode to be connected with another part intermediate level, when can guaranteeing a plurality of interior bushing pipe interconnect, when receiving axial force or circumference effect, the junction keeps firm connection.

(3) The embodiment of the utility model provides an example interior bushing pipe through being equipped with one of them of first connecting portion or second connecting portion, can conveniently with other interior bushing pipe connections to can be under the circumstances that receive effort such as shearing force or axial force, circumference power, keep firm in connection.

(4) The embodiment of the utility model provides an example interior bushing pipe, through setting up inlayer high chromium cast iron material, intermediate level high carbon steel and/or high strength alloy steel material, outer stainless steel material are showing the wearability and the high temperature resistance that have improved interior bushing pipe, make this interior bushing pipe can be applicable to the iron ore powder granule of high, high-temperature fast-speed of granularity and carry in the HI smel t smelting reduction technology.

(5) The embodiment of the utility model provides a lining pipe of example through adopting centrifugal casting technology, makes the metallurgical bonding layer even complete, has improved lining pipe's intensity effectively to make lining pipe have better toughness, the interior surface is smooth, is convenient for connect the installation, and the pipeline can not take place to warp under the effect of dead weight.

(6) The embodiment of the utility model provides a material conveying pipeline, connected mode between the pipeline inner tube are that inside boss is pegged graft with the recess cooperation, outside welding. According to the concave-convex welding composite connection, on one hand, the inner layer and part of the middle layer are connected in a concave-convex mode, and firm connection under the action of shearing force is guaranteed; on the other hand, the outer layer is connected with the other part of the middle layer in a welding mode, so that the firm connection and maintenance are guaranteed when the outer layer is subjected to axial force and circumferential force.

(7) The embodiment of the utility model provides a material conveying pipeline, outer tube adopt water-cooling copper sheathing can make material conveying pipeline's skin have cooling capacity, and the interior bushing pipe tip that the inner tube surpassed the outer tube part has the sintering section, and the sintering section can make the rifle body zonulae occludens of interior bushing pipe and smelting reduction furnace spray gun to guarantee material conveying pipeline's stability, avoid the material to strike rocking that causes.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

FIG. 1 is a cross-sectional view of a first liner tube according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view illustrating a second liner tube according to an embodiment of the present invention;

FIG. 3 is a schematic view illustrating a structure of a first inner liner pipe and a second inner liner pipe connected to each other according to an embodiment of the present invention;

FIG. 4 is a schematic view illustrating another structure of the first inner liner pipe and the second inner liner pipe according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram illustrating a material conveying pipeline according to an embodiment of the present invention.

Reference numerals:

10-a first lining pipe, 20-a second lining pipe, 30-an outer pipe, 40-a flange plate and 50-a sintering section;

11-boss, 12-inner layer, 13-middle layer, 14-outer layer;

21-groove, 22-weld.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

First, the technical concept of the present invention will be explained. The existing material conveying pipelines are generally connected by flanges or welding. Because the lining pipe is generally used as an inner pipe of a material conveying pipeline, if the lining pipe is connected in a welding mode, the outer surface of the lining pipe can only be welded, and the requirement on the sealing performance in the material conveying process cannot be met. During the conveying process, materials can be drilled into the joints of the inner surfaces of the inner pipes, and gaps at the joints are larger and larger. Meanwhile, due to the particularity of the HIsmel t melting reduction process, solid materials with small particle sizes are conveyed and the material conveying is in a high-temperature environment of 500 ℃ and 800 ℃. If the lining pipe adopts the welded connection mode, the joint gap can be enlarged, and finally the joint is damaged. The reason why the connection by means of flanges cannot be used is also based on the above.

Meanwhile, the lining pipe adopts a multilayer composite pipeline and the wall thickness of the pipeline is thick. If the welding mode is adopted for connection, the welding groove is required to be large, the welding is difficult, the welding quality is not easy to guarantee, and the intermetallic combination of the welding area is not good. The existing welding is generally plane welding of the same material, and the position is longitudinally butted by multiple materials, which cannot be solved by the prior art.

In addition, the common material conveying pipeline in the pipeline industry does not meet the requirements of the HIsmel t smelting reduction process at present. The conventional conveying pipeline and the high-performance wear-resistant pipeline have poor high-temperature resistance, and the strength, toughness and other properties of the material are reduced under the high-temperature working condition, so that the material is easy to fatigue and wear. During the conveying process, materials such as iron ore powder particles and the like can continuously impact and cut the pipe wall of the pipeline, so that the inner wall of the pipeline is seriously abraded, and even gradually worn through. Meanwhile, the HIsmelt reflects high-temperature gas with complex components in the furnace and can cause serious corrosion to the outer surface of the pipeline. On the other hand, when the common material conveying pipeline is obliquely inserted into the HIsmelt reaction furnace, the common material conveying pipeline is easy to bend and deform downwards under the action of self weight. Once a problem occurs in a material conveying pipeline, the production is stopped to replace and repair the material conveying pipeline, and the production operation rate of a factory is directly influenced. If the pipeline is worn through and water is leaked seriously, explosion can be caused, and accidents such as harm to personal safety and the like caused by burning of high-temperature and high-speed mineral powder are caused. Therefore, the HIsmelt reduction process puts higher requirements on the wear resistance, high temperature resistance and strength of the conveying pipeline.

Therefore, a novel lining pipe connecting structure, a lining pipe and a material conveying pipeline which are suitable for the HIsmelt reduction process need to be developed.

The specific scheme is as follows:

the present embodiment provides, in one aspect, a liner pipe connection structure that can be used to connect a first liner pipe 10 and a second liner pipe 20. The first and second inner liner pipes 10 and 20 are each composed of an inner layer 12, an intermediate layer 13, and an outer layer 14. The connection structure includes a first connection portion formed in the first liner tube 10, as shown in fig. 1, the first connection portion being located at one end of the first liner tube 10, the first connection portion including a boss 11 formed on an inner layer 12 and a portion of an intermediate layer 13 of the first liner tube 10 to protrude outward in an axial direction compared to an outer layer 14 and another portion of the intermediate layer 13 of the first liner tube 10. The connection structure further includes a second connection portion formed in the second liner tube 20, as shown in fig. 2, the second connection portion being located at one end of the second liner tube 20, and the second connection portion includes a groove 21 formed in the inner layer 12 and a portion of the intermediate layer 13 of the second liner tube 20, which are recessed inward in the axial direction compared to the outer layer 14 and another portion of the intermediate layer 13 of the second liner tube 20. As shown in fig. 3, when the first lining pipe 10 is connected to the second lining pipe 20, the projection 11 is matched with the size of the groove 21, and the first connecting portion and the second connecting portion can be plugged together.

The first connecting part and the second connecting part are arranged at the connecting position of the lining pipes, the boss 11 is arranged at the first connecting part, the groove 21 is arranged at the second connecting part, and the first lining pipe 10 and the second lining pipe 20 can be spliced together by the relative matching of the boss 11 and the groove 21. The joint between the first lining tube 10 and the second lining tube 20 is no longer a plane, but two planes separated by a certain distance. By the design, even if a part of materials are drilled into a gap between the inner layer 12 and a part of the middle layer 13 in the material conveying process, the materials cannot further penetrate into the other part of the middle layer 13 and the outer layer 14, so that the materials cannot be drilled into the whole joint of the lining pipe in a penetrating manner, and the sealing performance of the joint of the lining pipe is effectively ensured. Meanwhile, the design can also facilitate the mutual connection between the lining pipes; ensure the firm connection of the lining pipe joint when the lining pipe joint is subjected to the shearing force.

In a preferred implementation, as shown in fig. 4, the outer layer 14 and another part of the intermediate layer 13 of the first connection portion can be connected with the outer layer 14 and another part of the intermediate layer 13 of the second connection portion by welding. The outer layer 14 and the other part of the middle layer 13 are connected by welding, so that when the lining pipe is connected, the connection part can be firmly connected when axial force or circumferential force is applied.

Another aspect of this embodiment is to provide an inner liner tube, wherein the inner liner tube comprises an inner layer 12, a middle layer 13, and an outer layer 14.

Wherein, the concrete structure of the lining pipe can be realized by adopting one of the following embodiments:

embodiment 1: one end of the lining pipe is provided with a first connecting part, and the other end of the lining pipe can be designed into other forms according to different requirements.

Embodiment 2: one end of the lining pipe is provided with a second connecting part, and the other end of the lining pipe can be designed into other forms according to different requirements.

Embodiment 3: one end of the lining pipe is provided with a first connecting part, and the other end of the lining pipe is provided with a second connecting part.

The lining pipe is provided with one of the first connecting part and the second connecting part, so that the first connecting part and the second connecting part can be conveniently connected with each other, and the lining pipe can be kept firmly connected under the action of shearing force, axial force, circumferential force and the like.

In a preferred implementation, the inner layer 12 of the liner tube is made of high chromium cast iron, the intermediate layer 13 is made of high carbon steel and/or high strength alloy steel, and the outer layer 14 is made of stainless steel.

Preferably, the high-chromium cast iron has the composition C: 1.5% -5%; mn: 0.8% -7%; cr: 15% -40%; 1 to 5 percent of Ni; 1.5 to 8 percent of Mo; 0 to 0.8 percent of V; 0.1 to 0.5 percent of Ti; 0-2% of B; cu: 0 to 1 percent; 0-1% of Al.

Preferably, the intermediate layer 13 is made of high carbon steel with a carbon content of 0.1% -1.0%.

The inner layer 12 of the lining pipe is made of high-chromium cast iron, the middle layer 13 is made of high-carbon steel and/or high-strength alloy steel, and the outer layer 14 is made of stainless steel, so that the wear resistance and the high temperature resistance of the lining pipe can be obviously improved, and the lining pipe can be suitable for conveying iron ore powder particles with high granularity, high temperature and high speed in a HIsmel t melting reduction process.

In a preferred implementation, the inner diameter of the inner layer 12 of the liner tube is 150-200mm, the thickness of the inner layer 12 is 35-50mm, the thickness of the middle layer 13 is 15-25mm, and the thickness of the wall of the outer layer 14 is 3-8 mm.

In a preferred implementation, centrifugal casting is used between the inner layer 12, the middle layer 13 and the outer layer 14 of the lining pipe.

The adoption of the centrifugal casting process can ensure that the metallurgical bonding layer of the lining pipe is uniform and complete, effectively improve the strength of the lining pipe, ensure that the lining pipe has better toughness, smooth inner and outer surfaces and convenient connection and installation, and the pipeline cannot deform under the action of dead weight.

The centrifugal casting process is to solidify and form molten steel under the gravity condition which is dozens of times higher than that of the conventional casting process, so that the problem of internal looseness of a cast tube blank is well solved, the metal density is high, and the slag discharging and gas exhausting effects are good. Compared with the conventional steel pipe casting inner wear-resistant layer composite pipe (namely, the composite pipe is formed by multilayer die casting), the lining pipe produced by adopting the centrifugal casting process has the following characteristics:

firstly, the metals of the centrifugally poured inner layer and the centrifugally poured outer layer 14 are mutually fused at the bonding surface at high temperature, so that the formed metallurgical bonding layer is uniform and complete. The metal of the inner layer 12 can effectively improve the strength of the whole pipe by about 20 percent, and the outer layer 14 has enough toughness;

secondly, because the metal of the inner layer 12 flows on the high-temperature surface of the outer layer 14 in the casting process, the temperature is reduced slowly, and sufficient time for removing impurities is provided, so that the inner surface of the pipe body is smooth and flat;

and thirdly, the three layers of metal are cast at one time, so that the production cost is low, the yield is high, and the practicability is high.

The centrifugal casting process comprises the following steps:

(1) respectively smelting high-chromium cast iron, carbon steel and stainless steel into molten metal, sequentially removing slag and deoxidizing, and preserving heat at a preset temperature;

(2) spraying a protective layer on the inner wall of the die cylinder, preheating, and pouring carbon steel molten metal into the rotating die cylinder to centrifugally cast the middle layer 13;

(3) after the middle layer 13 is cooled to a specific temperature, pouring high-chromium cast iron molten metal and stainless steel molten metal into a rotary die cylinder in sequence, and centrifugally casting an inner layer 12 and an outer layer 14;

(4) and gradually reducing the rotating speed of the die cylinder to finish casting.

As shown in fig. 5, the present embodiment further provides a material conveying pipeline, which includes an inner pipe and an outer pipe 30, wherein the inner pipe is formed by connecting a plurality of inner lining pipes as described above. When a plurality of lining pipes are connected, the inner layers 12 of the first connecting part and the second connecting part are connected with a part of the middle layers 13 in an inserting mode, and the outer layers 14 of the first connecting part and the second connecting part are connected with the other part of the middle layers 13 in a welding mode. Preferably, the length of the inner pipe is 3-10mm, and the inner pipe is composed of 1-12 sections of lining pipes, each section of lining pipe is 700mm +/-100 mm, and when a one-section structure is adopted, the corresponding structures such as the grooves 21 and the like are machined on the flange or adopt other forms.

The inner pipe of the material conveying pipeline is formed by mutually connecting a plurality of sections of lining pipes. The connection mode among all lining pipes is that the inner lug boss 11 is matched and inserted with the groove 21 and the outside is welded. According to the concave-convex welding composite connection, on one hand, the inner layer 12 and part of the middle layer 13 are connected in a concave-convex mode, and firm connection under the action of shearing force is guaranteed; on the other hand, the outer layer 14 and the other part of the intermediate layer 13 are connected in a welding mode, and the connection is kept firm when axial force and circumferential force are applied.

In a preferred implementation, the outer pipe 30 of the material conveying pipeline is a water-cooled copper sleeve with cooling capacity, and the end of the inner pipe exceeds the water-cooled copper sleeve by 100mm and 300 mm. The area of the end part of the inner pipe exceeding the outer pipe 30 is a lining pipe sintering section 50, and the lining pipe and the gun body are tightly connected through high-temperature melting sintering at 2000 ℃ during starting production, so that the stability of the lining pipe and the gun body is ensured, and the shaking caused by material impact is avoided.

In a preferred implementation, the material transfer conduit further comprises a flange 40. The flange 40 and the wear-resistant lining pipe are connected by welding, a groove is firstly cut by metal heat, and the welding is carried out by submerged arc welding. The flange 40 is externally connected with a cooling water pipeline and used for cooling an inlet area.

The utility model can be realized by adopting or using the prior art for reference in places which are not mentioned in the utility model.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various changes or substitutions within the technical scope of the present invention, which should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "square," and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The above disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of the specific examples are described above. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Claims (8)

1. A liner pipe connecting structure usable for connecting a first liner pipe and a second liner pipe, each of the first liner pipe and the second liner pipe being composed of an inner layer, a middle layer, and an outer layer, the connecting structure comprising:

a first connection portion formed on the first lining pipe, the first connection portion being located at one end of the first lining pipe, the first connection portion including a boss formed on an inner layer and a part of an intermediate layer of the first lining pipe, the boss protruding outward in an axial direction compared with an outer layer and another part of the intermediate layer of the first lining pipe;

a second connection portion formed on the second liner pipe, the second connection portion being located at one end of the second liner pipe, the second connection portion including a groove formed in an inner layer and a part of an intermediate layer of the second liner pipe, the groove being recessed inward in an axial direction compared with an outer layer and another part of the intermediate layer of the second liner pipe;

when the first lining pipe is connected with the second lining pipe, the lug boss is matched with the groove in size, and the first connecting part can be spliced with the second connecting part.

2. The inner liner pipe connection structure according to claim 1, wherein:

the outer layer and the other part of the middle layer of the first connecting part can be connected with the outer layer and the other part of the middle layer of the second connecting part in a welding mode.

3. A lining pipe comprising an inner layer, an intermediate layer and an outer layer, wherein the lining pipe has at least one of the first connecting portion and the second connecting portion in the connecting structure of the lining pipe according to any one of claims 1 to 2.

4. The liner tube of claim 3, wherein:

the thickness of the inner layer is 35-50mm, the thickness of the middle layer is 15-25mm, and the thickness of the outer layer wall is 3-8 mm.

5. The liner tube of claim 3, wherein:

and centrifugal casting molding is adopted among the inner layer, the middle layer and the outer layer.

6. A material conveying pipe, characterized in that it comprises an inner pipe and an outer pipe, the inner pipe being formed by connecting at least one inner lining pipe according to any one of claims 4-5.

7. The material transport conduit of claim 6, wherein:

when a plurality of lining pipes are connected, the inner layers of the first connecting parts and the second connecting parts are connected with a part of middle layers in an inserting manner at the connecting positions, and the outer layers of the first connecting parts and the second connecting parts are connected with the other part of middle layers in a welding manner.

8. The material transport conduit of claim 6, wherein:

the outer pipe is a water-cooling copper sleeve, the inner pipe exceeds the water-cooling copper sleeve by 100-300mm, and the end part of the inner layer of the lining pipe, which exceeds the water-cooling copper sleeve, of the inner pipe is provided with a sintering section.

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