CN111765326B

CN111765326B - Pipeline, preparation method of pipeline and concrete machine

Info

Publication number: CN111765326B
Application number: CN202010580464.XA
Authority: CN
Inventors: 郭汐; 谷云辉; 李昴
Original assignee: Sany Automobile Manufacturing Co Ltd
Current assignee: Sany Automobile Manufacturing Co Ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2022-05-17
Anticipated expiration: 2040-06-23
Also published as: CN111765326A

Abstract

The invention provides a pipeline, a preparation method of the pipeline and a concrete machine, wherein the pipeline comprises: a pipe body; the wear-resistant coating is formed on the inner wall of the pipe body through thermal spraying; wherein the wear resistant coating comprises a ceramic material coating. The wear-resistant coating can be used for avoiding direct impact of materials on the wear-resistant pipe body, so that the wear of the pipe body by the materials is avoided, the service life of the pipe body is prolonged, the pipe body can be made of conventional metals except wear-resistant alloy, and the weight and the production cost of the pipe body are reduced. Wear-resisting coating is hot spraying forming's integral type structure, and the structural stability of integral type structure is stronger on the one hand, does not have the structural connection section, can effectively avoid the phenomenon that the structure is damaged or drops, and on the other hand, hot spraying technique possesses the advantage that the shaping is efficient, stability is strong, can reduce the manufacturing cost of pipeline and further promote wear-resisting coating's structural stability.

Description

Pipeline, preparation method of pipeline and concrete machine

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a pipeline, a preparation method of the pipeline and a concrete machine.

Background

At present, on a concrete conveying pipeline, the inner layer of a double-layer pipe body is made of wear-resistant metal so as to reduce the wear of concrete to the conveying pipeline, but the inner layer of the pipe body is made of wear-resistant alloy, so that the problems of heavy weight and short service life are solved.

Therefore, how to design a conveying pipeline with light weight and strong wear-resisting life becomes a technical problem to be solved urgently.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

To this end, a first aspect of the invention provides a pipe.

A second aspect of the invention provides a method of making a pipe.

A third aspect of the invention provides a concrete machine.

In view of this, a first aspect of the present invention proposes a pipe comprising: a pipe body; the wear-resistant coating is formed on the inner wall of the pipe body through thermal spraying; wherein the wear resistant coating comprises a ceramic material coating.

In this solution, a pipe is defined, comprising a pipe body and a wear resistant coating. The pipe body is the major structure of pipeline. The wear-resistant coating covers and is located the internal face of body, and in the course of the work, the material contacts with wear-resistant coating, can avoid the direct impact wearing and tearing body of material through setting up wear-resistant coating to avoid the body by the material wearing and tearing, the life of extension body. In addition, the wear-resistant coating can be arranged to enable the pipe body to be made of conventional metals except wear-resistant alloy, so that the weight and the production cost of the pipe body are reduced. Wherein, wear-resisting coating passes through thermal spraying forming on the inner wall of body, and the structural stability of thermal spraying forming's structure is stronger on the one hand, does not have the structural connection section, can effectively avoid the phenomenon that the structure is damaged or drops, and on the other hand, thermal spraying technique possess the advantage that the shaping is efficient, stability is strong, can reduce the manufacturing cost of pipeline and further promote wear-resisting coating's structural stability. The wear-resistant coating comprises a ceramic material coating, and the ceramic material coating has excellent wear resistance and can effectively reduce the wear rate of the wear-resistant coating in the working process. And the ceramic material coating formed by thermal spraying has stronger matching reliability with the inner wall of the pipe body, and is not easy to fall off and crack. And then realize optimizing pipeline structure, promote pipeline structure stability and reliability, prolong pipeline life, reduce pipeline manufacturing cost's technical effect.

At present, the concrete conveying pipeline generally solves the abrasion problem in two ways. The first is to select wear-resistant alloy to prepare the inner layer of the concrete pipeline, and the local wear-resistant strength is controlled by controlling the thickness of the inner layer. However, the wear-resistant alloy has the problems of high cost and heavy weight. To this, this application avoids chooseing for use wear-resisting alloy on the preparation of body through set up wear-resisting coating at the body inlayer to this problem has been solved. The second is that ceramic plates are attached to the inner wall of the concrete conveying pipeline, but the ceramic plates are easy to wear and fall off locally, and the stability is poor. In this regard, the present application solves this problem by forming a wear resistant coating comprising a ceramic material coating on the inner wall of the tube body by a thermal spray technique.

In addition, the pipeline in the above technical solution provided by the present invention may also have the following additional technical features:

in the above technical solution, further, the wear-resistant coating includes: the basal layer is arranged on the inner wall of the pipe body; the wearing layer is connected with the basal layer, and the basal layer is located between body and the wearing layer, and the wearing layer is ceramic material layer.

In this technical scheme, the wear-resistant coating includes stratum basale and wearing layer, and the stratum basale sets up on the inner wall of body, and the wearing layer sets up on the stratum basale, and wherein the stratum basale is located between body and the wearing layer to separate body and wearing layer. The stratum basale is the base plate material of hot spraying, can avoid the body by direct heating at the sintering process of hot spraying through setting up the stratum basale to avoid the body to appear the warpage under the effect of thermal stress, thereby promote the structural stability of body and the reliability of hot spraying. The wear-resistant layer is formed on the substrate layer through a thermal spraying technology, and the wear-resistant layer is a ceramic material layer. In the working process, wearing layer and material direct contact to avoid body and material direct contact, and then effectively prevent the body by wearing and tearing through the wear-resisting characteristic that ceramic material possessed, promote the wearability of pipeline.

In any of the above technical solutions, further, the base layer is a nickel-based metal base layer.

In the technical scheme, the substrate layer is a nickel-based metal substrate layer, nickel-based metal can stably work in a high-temperature environment above 600 ℃, and the substrate layer is set to be the nickel-based metal substrate layer, so that the substrate layer can be guaranteed to be stable and reliable in property maintenance in a thermal spraying high-temperature sintering process, on one hand, the pipe body is prevented from being warped and broken in the high-temperature environment, and on the other hand, the wear-resistant layer can be stably and reliably attached to the substrate layer. And then realize optimizing pipeline structure, promote the technical effect of pipeline stability and reliability.

In any of the above solutions, further, the wear resistant layer includes microparticles and/or nanoparticles; the wear-resistant layer comprises at least one or a combination of silicon nitride, tungsten carbide and aluminum oxide.

In this technical scheme, the wearing layer includes microparticle and/or nanoparticle, can promote wearing layer's wearability and structural stability for declining/nanometer material through injecing the wearing layer, avoids the great space on the wearing layer to destroy the wearing layer structure. Wherein, the composition of wearing layer chooses one of silicon nitride, tungsten carbide, aluminium oxide or the combination, can guarantee wearing layer's wearability and stability through choosing for use above-mentioned material.

In any of the above technical solutions, further, the pipeline further includes: the reinforcing layer is located between the substrate layer and the reinforcing layer, and the reinforcing layer fills the pores in the wear-resistant layer.

In the technical scheme, the pipeline is further provided with a reinforcing layer, the reinforcing layer is covered on the surface of the wear-resistant layer, the wear-resistant layer is arranged between the substrate layer and the reinforcing layer, the reinforcing layer is coupled with the wear-resistant layer, and the reinforcing layer is filled in the holes in the wear-resistant layer. Through setting up the enhancement layer on the one hand can reduce the coefficient of friction on the surface that pipeline and material contacted, effectively reduce wear efficiency, on the other hand enhancement layer can reinforcement and protection wearing layer, promotes the wearability of wearing layer, prolongs the life of wearing layer. Thereby realizing the technical effects of optimizing the pipeline structure, improving the working stability of the pipeline and prolonging the service life of the pipeline.

In any one of the above technical solutions, further, the pipe body includes: an inner tube; the outer pipe is sleeved outside the inner pipe; wherein, the inner tube is the alloy steel inner tube, and the outer tube is low carbon steel outer tube, forms the cavity between inner tube and the outer tube.

In this technical scheme, a body structure has been injectd, and body includes inner tube and outer tube in this structure, and the outer tube housing is established in the inner tube outside, forms double-deck body structure, and wherein, the inner tube is the alloy steel inner tube, and the outer tube is the low carbon steel outer tube. Through setting up the body for bilayer structure can promote the structural stability and the reliability of body on the one hand, on the other hand can bring the convenient condition for the maintenance and the maintenance of body. Alloy steel has high strength, high toughness, high wear resistance, high/low temperature stability strong and corrosion resistance's advantage, can promote the structural strength of inner tube on the one hand through selecting for use alloy steel inner tube, and on the other hand can avoid the inner tube to warp in the high temperature sintering process. The low carbon steel possesses the advantage that plasticity is strong, can reduce the shaping degree of difficulty of outer tube and promote the toughness of outer tube through chooseing for use alloy steel outer tube. And, the interval sets up between inner tube and the outer tube to form the cavity between inner tube and outer tube, through set up the cavity between inner tube and outer tube, can avoid wearing and tearing because of the contact between inner tube and the outer tube on the one hand, on the other hand makes the inner tube possess certain thermal deformation space in the heating process of hot spraying process, avoids when heating the inner tube, buckle and fracture appear because of heating deformation between inner tube and the outer tube.

In any of the above technical schemes, further, the tube body is a low carbon steel tube body.

In this technical scheme, another kind of body structure has been injectd, and the whole low carbon steel body of chooseing for use of body among this structure forms the individual layer body structure. The pipe body structure can be simplified by limiting the pipe body to be a single-layer pipe body structure, the production difficulty of the pipe body is reduced, and the production cost of the pipe body is reduced. Wherein, low carbon steel possesses the strong advantage of plasticity, can reduce the shaping degree of difficulty of body and promote the toughness of body through chooseing for use the alloy steel body.

According to a second aspect of the present invention, there is provided a method for manufacturing a pipe, which is used for manufacturing the pipe in any one of the above technical solutions, the method for manufacturing the pipe includes: coarsening the inner wall surface of the tube body; thermally spraying a substrate layer on the inner wall surface; and thermally spraying a wear-resistant layer on the substrate layer.

In this solution, a method for producing a wear resistant coating according to any of the above-mentioned solutions is proposed. The preparation method comprises the following specific steps: firstly, roughening the inner wall surface of the pipe body, wherein the roughening can improve the roughness of the inner wall surface of the pipe body, so that the affinity between the inner wall surface of the pipe body and a wear-resistant layer is improved, and the wear-resistant coating can be firmly attached to the inner wall of the pipe body; secondly, thermally spraying a substrate layer on the inner wall surface of the pipe body, wherein the substrate layer is preferably made of high-temperature alloy such as nickel-based metal and the like, and the substrate layer can prevent the pipe body from being directly heated in the sintering process of thermal spraying and prevent the pipe body from warping under the action of thermal stress, so that the structural stability of the pipe body and the reliability of the thermal spraying are improved; the third step, thermal spraying wearing layer on the stratum basale, wearing layer and the material direct contact of carrying, mainly undertake wearing and tearing, can separate body and material through setting up the wearing layer, avoid the body to be worn and torn to promote the wearability of pipeline, and can make the body select for use the conventional metal of non-wear-resisting metal through setting up the wearing layer, thereby reduce the manufacturing cost of body on the one hand, on the other hand can alleviate the weight of body. Wherein, hot spraying technique is with high velocity air flow with its injection to the work piece surface after melting coating material heating, through selecting for use hot spraying technique preparation stratum basale and wearing layer, can promote the compatible type of stratum basale and wearing layer on the body internal face, avoids appearing the gap between each structure to hot spraying technique possesses the processing degree of difficulty low, advantage that production efficiency is high, and then effectively reduces the preparation degree of difficulty of wear-resistant coating, promotes wear-resistant coating's production efficiency.

In any of the above technical solutions, further, the method for preparing a pipeline further includes: and coating a reinforcing layer on the wear-resistant layer by brushing.

In the technical scheme, after the preparation of the wear-resistant layer is completed, the reinforcing layer is coated on the wear-resistant layer in a brush way. The reinforcing layer is disposed on the surface of the wear layer such that the wear layer is disposed between the substrate layer and the reinforcing layer, wherein the reinforcing layer is coupled to the wear layer and the reinforcing layer fills the voids in the wear layer. Through setting up the enhancement layer on the one hand can reduce the coefficient of friction on the surface that pipeline and material contacted, effectively reduce wear efficiency, on the other hand enhancement layer can reinforcement and protection wearing layer, promotes the wearability of wearing layer, prolongs the life of wearing layer. Thereby realizing the technical effects of optimizing the pipeline structure, improving the working stability of the pipeline and prolonging the service life of the pipeline.

According to a third aspect of the present invention, there is provided a concrete machine including: a body; the pipeline among the above-mentioned any technical scheme, the body sets up on the body.

In the technical scheme, a product type of the pipeline applied to any one of the technical schemes is provided, and the product type is concrete machinery, and the concrete machinery specifically comprises a concrete pump truck, a vehicle-mounted concrete pump and a load-carrying concrete pump. Through set up this pipeline on concrete machine's body, can guarantee this concrete machine accessible this pipeline and transmit concrete material effectively for a long time to promote concrete machine's job stabilization nature and reliability, prolong concrete machine's life.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 shows a schematic structural diagram of a conduit according to an embodiment of the invention;

FIG. 2 shows a close-up view of the pipe at A in the embodiment of FIG. 1;

FIG. 3 shows a schematic structural diagram of a conduit according to another embodiment of the invention;

FIG. 4 shows an enlarged partial view of the pipe at B of the embodiment shown in FIG. 3;

FIG. 5 shows a schematic structural diagram of a conduit according to yet another embodiment of the present invention;

FIG. 6 shows a schematic structural diagram of a conduit according to yet another embodiment of the present invention;

FIG. 7 shows a schematic structural diagram of a conduit according to yet another embodiment of the present invention;

FIG. 8 shows a flow diagram of a method of making a pipe according to one embodiment of the invention;

fig. 9 shows a flow chart of a method of making a tube according to yet another embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 7 is:

1 pipe, 10 pipe bodies, 102 inner pipe, 104 outer pipe and 20 wear-resistant coating.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A method of preparing the pipe 1, the wear-resistant coating 20, and the concrete machine according to some embodiments of the present invention are described below with reference to fig. 1 to 9.

As shown in fig. 1 and 2, an embodiment of the first aspect of the present invention provides a pipeline 1, where the pipeline 1 includes: a tube body 10; a wear-resistant coating layer 20 formed on the inner wall of the pipe body 10 by thermal spraying; wherein the wear resistant coating 20 comprises a ceramic material coating.

In this embodiment, a pipe 1 is defined, the pipe 1 comprising a pipe body 10 and a wear resistant coating 20. The pipe body 10 is the main structure of the pipeline 1. The wear-resistant coating 20 covers and is located the internal face of body 10, and in the course of the work, the material contacts with wear-resistant coating 20, can avoid the direct impact of material wearing and tearing body 10 through setting up wear-resistant coating 20 to avoid body 10 to be worn by the material, prolong the life of body 10. In addition, the pipe body 10 may be made of a conventional metal other than the wear-resistant alloy by providing the wear-resistant coating layer 20, thereby reducing the weight and production cost of the pipe body 10. Wherein, wear-resistant coating 20 is on the inner wall of body 10 through thermal spraying formation, and the structural stability of thermal spraying formation's structure is stronger on the one hand, does not have the structural connection section, can effectively avoid the phenomenon that the structure is damaged or drops, and on the other hand, thermal spraying technique possess the advantage that the shaping is efficient, stability is strong, can reduce the manufacturing cost of pipeline 1 and further promote wear-resistant coating 20's structural stability. The wear-resistant coating 20 comprises a ceramic material coating which has excellent wear resistance and can effectively reduce the wear rate of the wear-resistant coating 20 in the working process. And the ceramic material coating formed by thermal spraying has stronger matching reliability with the inner wall of the pipe body 10, and is not easy to fall off and crack. And then realize optimizing 1 structure of pipeline, promote 1 structural stability of pipeline and reliability, prolong 1 life of pipeline, reduce 1 manufacturing cost's of pipeline technical effect.

The abrasion problem of the concrete conveying pipeline 1 is generally solved by two ways. The first method is to select wear-resistant alloy to prepare the inner layer of the concrete pipeline 1, and the local wear-resistant strength is controlled by controlling the thickness of the inner layer. However, the wear-resistant alloy has the problems of high cost and heavy weight. To this end, this application avoids chooseing for use wear-resisting alloy in the preparation of body 10 through set up wear-resisting coating 20 at body 10 inlayer to this problem has been solved. The second is that ceramic plates are attached to the inner wall of the concrete conveying pipeline 1, but the ceramic plates are easy to wear and fall off locally, and the stability is poor. In this regard, the present application solves this problem by forming a wear resistant coating 20 comprising a coating of ceramic material on the inner wall of the tubular body 10 by thermal spray techniques.

In one embodiment of the present invention, further, the wear resistant coating 20 comprises: a base layer disposed on an inner wall of the pipe 10; the wearing layer is connected with the stratum basale, and the stratum basale is located between body 10 and the wearing layer, and the wearing layer is ceramic material layer.

In this embodiment, the wear resistant coating 20 comprises a substrate layer disposed on the inner wall of the pipe body 10 and a wear resistant layer disposed on the substrate layer, wherein the substrate layer is located between the pipe body 10 and the wear resistant layer to separate the pipe body 10 from the wear resistant layer. The stratum basale is the base plate material of hot spraying, can avoid body 10 by direct heating in the sintering process of hot spraying through setting up the stratum basale to avoid body 10 to appear the warpage under the effect of thermal stress, thereby promote the structural stability of body 10 and the reliability of hot spraying. The wear-resistant layer is formed on the basal layer by a thermal spraying technology and is a ceramic material layer. In the working process, wearing layer and material direct contact to avoid body 10 and material direct contact, and then effectively prevent body 10 by wearing and tearing, promote pipeline 1's wearability through the wear-resisting characteristic that ceramic material possessed.

In one embodiment of the invention, further, the substrate layer is a nickel-based metal substrate layer.

In this embodiment, the substrate layer is a nickel-based metal substrate layer, and the nickel-based metal can stably work in a high-temperature environment of more than 600 ℃, and by setting the substrate layer as the nickel-based metal substrate layer, it can be ensured that the substrate layer keeps stable and reliable in properties in a high-temperature sintering process of thermal spraying, on one hand, the pipe body 10 is prevented from warping and breaking in the high-temperature environment, and on the other hand, the wear-resistant layer can be stably and reliably attached to the substrate layer. And then realize optimizing 1 structure of pipeline, promote the technical effect of 1 stability of pipeline and reliability.

In one embodiment of the invention, further, the wear resistant layer comprises micro-and/or nano-particles; the wear-resistant layer comprises at least one or a combination of silicon nitride, tungsten carbide and aluminum oxide.

In this embodiment, the wear-resistant layer includes micro-particles and/or nano-particles, and wear resistance and structural stability of the wear-resistant layer can be improved by limiting the wear-resistant layer to be a micro/nano material, so that the structure of the wear-resistant layer is prevented from being damaged by a large gap on the wear-resistant layer. Wherein, the composition of wearing layer chooses one of silicon nitride, tungsten carbide, aluminium oxide or the combination, can guarantee wearing layer's wearability and stability through choosing for use above-mentioned material.

In one embodiment of the present invention, further, the pipe 1 further comprises: the reinforcing layer is located between the substrate layer and the reinforcing layer, and the reinforcing layer fills the pores in the wear-resistant layer.

In this embodiment, the pipe 1 is further provided with a reinforcing layer which covers the surface of the wear layer such that the wear layer is disposed between the substrate layer and the reinforcing layer, wherein the reinforcing layer is coupled to the wear layer and the reinforcing layer fills the pores in the wear layer. Through setting up the enhancement layer on the one hand can reduce the coefficient of friction on the surface that pipeline 1 and material contacted, effectively reduce wear efficiency, on the other hand enhancement layer can reinforcement and protection wearing layer, promotes the wearability of wearing layer, prolongs the life of wearing layer. And then realize optimizing 1 structure of pipeline, promote 1 job stabilization nature of pipeline, prolong 1 life's of pipeline's technical effect.

In one embodiment of the present invention, further, as shown in fig. 1 and 2, the pipe body 10 includes: an inner tube 102; an outer tube 104 sleeved outside the inner tube 102; the inner tube 102 is an alloy steel inner tube, the outer tube 104 is a mild steel outer tube, and a cavity is formed between the inner tube 102 and the outer tube 104.

In this embodiment, a structure of the pipe body 10 is defined, in which the pipe body 10 includes an inner pipe 102 and an outer pipe 104, the outer pipe 104 is sleeved outside the inner pipe 102 to form a double-layer structure of the pipe body 10, wherein the inner pipe 102 is an alloy steel inner pipe, and the outer pipe 104 is a mild steel outer pipe. Through setting up body 10 and being bilayer structure on the one hand can promote the structural stability and the reliability of body 10, on the other hand can bring the convenience for the maintenance and the maintenance of body 10. The alloy steel has the advantages of high strength, high toughness, high wear resistance, high/low temperature stability, and corrosion resistance, and the structural strength of the inner tube 102 can be improved by selecting the alloy steel inner tube, and the inner tube 102 can be prevented from warping in the high-temperature sintering process. The low carbon steel has the advantage of strong plasticity, and the forming difficulty of the outer tube 104 can be reduced and the toughness of the outer tube 104 can be improved by selecting the alloy steel outer tube 104. In addition, the inner tube 102 and the outer tube 104 are arranged at intervals to form a cavity between the inner tube 102 and the outer tube 104, and the cavity is arranged between the inner tube 102 and the outer tube 104, so that on one hand, the inner tube 102 and the outer tube 104 can be prevented from being worn due to contact, on the other hand, the inner tube 102 is enabled to have a certain thermal deformation space in the heating process of the thermal spraying process, and the inner tube 102 and the outer tube 104 are prevented from being bent and broken due to thermal deformation when the inner tube 102 is heated.

In one embodiment of the present invention, further, as shown in fig. 3 and 4, the pipe body 10 is a low carbon steel pipe body 10.

In this embodiment, another structure of the pipe body 10 is defined, in which the pipe body 10 is entirely made of a low carbon steel pipe body 10 to form a single-layer pipe body 10 structure. The structure of the pipe body 10 can be simplified by limiting the pipe body 10 to be a single-layer pipe body 10 structure, the production difficulty of the pipe body 10 is reduced, and the production cost of the pipe body 10 is reduced. The low-carbon steel has the advantage of high plasticity, and the forming difficulty of the pipe body 10 can be reduced and the toughness of the pipe body 10 can be improved by selecting the alloy steel pipe body 10.

In an embodiment of the second aspect of the present invention, as shown in fig. 8, there is provided a method for preparing a wear-resistant coating 20, for preparing a pipe 1 in any of the above embodiments, the method for preparing the wear-resistant coating 20 comprises:

step S802, roughening the inner wall surface of the pipe body;

step S804, thermally spraying a substrate layer on the inner wall surface;

step S806, a wear-resistant layer is thermally sprayed on the base layer.

In this embodiment, a method of making the wear resistant coating 20 of any of the above embodiments is presented. The preparation method comprises the following specific steps: firstly, roughening the inner wall surface of the pipe body 10, wherein the roughening can improve the roughness of the inner wall surface of the pipe body 10, so that the affinity between the inner wall surface of the pipe body 10 and a wear-resistant layer is improved, and the wear-resistant coating 20 can be firmly attached to the inner wall of the pipe body 10; secondly, thermally spraying a substrate layer on the inner wall surface of the pipe body 10, wherein the substrate layer is preferably made of high-temperature alloy such as nickel-based metal and the like, and the substrate layer can prevent the pipe body 10 from being directly heated in the sintering process of thermal spraying and prevent the pipe body 10 from warping under the action of thermal stress, so that the structural stability of the pipe body 10 and the reliability of the thermal spraying are improved; the third step, thermal spraying wearing layer on the stratum basale, wearing layer and the material direct contact of carrying, mainly undertake wearing and tearing, can separate body 10 and material through setting up the wearing layer, avoid body 10 to be worn and torn to promote pipeline 1's wearability, and can make body 10 choose for use the conventional metal of non-wear-resisting metal through setting up the wearing layer, thereby reduce the manufacturing cost of body 10 on the one hand, on the other hand can alleviate the weight of body 10. Wherein, hot spraying technique is with high velocity air flow with its injection to the work piece surface after melting coating material heating, through selecting for use hot spraying technique preparation stratum basale and wearing layer, can promote the compatible type of stratum basale and wearing layer on body 10 internal face, avoids appearing the gap between each structure to hot spraying technique possesses the processing degree of difficulty low, and the advantage that production efficiency is high, and then effectively reduces the preparation degree of difficulty of wear-resistant coating 20, promotes wear-resistant coating 20's production efficiency.

In one embodiment of the present invention, further, as shown in fig. 9, the method for preparing the wear-resistant coating 20 comprises:

step S902, roughening the inner wall surface of the pipe body;

step S904, thermally spraying a base layer on the inner wall surface;

step S906, thermally spraying a wear-resistant layer on the substrate layer;

and step S908, brushing a reinforcing layer on the wear-resistant layer.

In this example, after the preparation of the wear layer is completed, a reinforcing layer is brushed on the wear layer. The reinforcing layer is disposed on the surface of the wear layer such that the wear layer is disposed between the substrate layer and the reinforcing layer, wherein the reinforcing layer is coupled to the wear layer and the reinforcing layer fills the voids in the wear layer. Through setting up the enhancement layer on the one hand can reduce the coefficient of friction on the surface that pipeline 1 and material contacted, effectively reduce wear efficiency, on the other hand enhancement layer can reinforcement and protection wearing layer, promotes the wearability of wearing layer, prolongs the life of wearing layer. And then realize optimizing 1 structure of pipeline, promote 1 job stabilization nature of pipeline, prolong 1 life's of pipeline's technical effect.

In an embodiment of the third aspect of the present invention, there is provided a concrete machine including: a body; in the pipe 1 of any of the above embodiments, the pipe body 10 is disposed on the body.

In this embodiment, a product type to which the pipe 1 of any of the above embodiments is applied is provided, and the product type is a concrete machine, and the concrete machine includes a concrete pump truck, a truck-mounted concrete pump, and a load-carrying concrete pump. Through set up this pipeline 1 on concrete machine's body, can guarantee this concrete machine accessible this pipeline 1 long-term effective material of transmitting to promote concrete machine's job stabilization nature and reliability, prolong concrete machine's life.

Specifically, the concrete machinery is the concrete pump truck, and body 10 sets up on the body of concrete pump truck, and body 10 is connected with the pump body, and in the course of the work, the pump body passes through pipeline 1 and extracts the concrete to carry the concrete to the appointed area through the concrete pump truck. Wherein, the inner wall of the pipe body 10 is provided with the integrated wear-resistant coating 20 formed by thermal spraying, and the concrete is contacted with the wear-resistant coating 20 to avoid the pipe body 10 from being worn by the concrete. And the wear-resistant coating can keep long-term stable work by virtue of the excellent wear-resistant property, so that the service life of the concrete pump truck is prolonged, and the maintenance period is prolonged.

In one embodiment of the present invention, as shown in fig. 1 and 2, the structural form of the pipe body 10 still adopts a composite structure of double pipes, the outer pipe 104 uses mild steel as a bearing force, and the inner pipe 102 eliminates the use of wear-resistant alloy, and instead uses low-cost alloy steel as a substrate. The inner wall of the tube 10 is then roughened and the inner tube 102 is sprayed with the wear-resistant coating 20 using a thermal spray technique.

For the wear-resistant coating 20, the first layer is a base layer, and the first layer is used as a substrate material for spraying, because the material of the pipe body 10 is mainly wear-resistant cast iron or common carbon structural steel, the thermal stress generated during the sintering process easily exceeds the high-temperature strength of the material itself. This is prone to warping during the molding process, which can affect the tube 10 and the wear-resistant coating 20. The substrate layer is recommended to be a nickel-based metal substrate and can also be other high-temperature alloys;

the second layer is a wear-resistant layer which mainly plays a role in wear, and silicon nitride, tungsten carbide, aluminum oxide or a composite form of wear-resistant material is recommended to be selected;

the third layer is a reinforcing layer, the reinforcing layer is coupled with the front two layers, and the main functions of the reinforcing layer are two points, namely, the surface friction coefficient is reduced, the abrasion rate is effectively reduced, and the wear-resistant layer is reinforced.

The thermal spraying wear-resistant coating 20 technology is used for pumping, coagulating and conveying bent pipes, straight pipes and S-shaped pipes, and comprises a single-layer pipe and a composite double-layer pipe in structural forms; and the technology can be applied to the repair and renovation of the old pipe, and for a double-layer pipe structure, a certain completeness rate of the outer pipe 104 is required to be kept.

In another embodiment of the present invention, as shown in fig. 5, the pipeline 1 is a concrete conveying straight pipe, the pipe body 10 is a double-layer structure, the outer pipe 104 is sleeved outside the inner pipe 102, the inner wall of the inner pipe 102 is provided with the wear-resistant coating 20, and during operation, the concrete is in contact with the wear-resistant coating 20.

In a further embodiment of the present invention, as shown in fig. 6, the pipeline 1 is a concrete delivery straight pipe, the pipe body 10 is a single-layer structure, the inner wall of the pipe body 10 is provided with a wear-resistant coating 20, and during operation, the concrete is in contact with the wear-resistant coating 20.

In a further embodiment of the invention, as shown in fig. 7, the pipeline 1 is a concrete-conveying S-pipe, the pipe body is of a single-layer structure, and the inner wall of the pipe body is provided with a wear-resistant coating, so that the concrete is in contact with the wear-resistant coating during operation.

In the present invention, the terms "mounting," "connecting," "fixing," and the like are used in a broad sense, for example, "connecting" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipe (1), characterized in that it comprises:

a tube (10);

a wear-resistant coating (20) formed on the inner wall of the pipe body (10) by thermal spraying;

wherein the wear resistant coating (20) comprises a ceramic material coating;

the wear resistant coating (20) comprises:

a base layer disposed on an inner wall of the tube (10);

the wear-resistant layer is connected with the substrate layer, the substrate layer is positioned between the pipe body (10) and the wear-resistant layer, and the wear-resistant layer is a ceramic material coating;

a reinforcing layer, the wear layer being positioned between the substrate layer and the reinforcing layer, the reinforcing layer filling pores in the wear layer;

the pipe body (10) includes:

an inner tube (102);

the outer pipe (104) is sleeved outside the inner pipe (102);

the inner pipe (102) is an alloy steel inner pipe (102), the outer pipe (104) is a low carbon steel outer pipe (104), and a cavity is formed between the inner pipe (102) and the outer pipe (104).

2. The pipe (1) according to claim 1, wherein the substrate layer is a nickel-based metal substrate layer.

3. The pipe (1) according to claim 1, wherein said wear resistant layer comprises micro-and/or nano-particles;

the composition of the wear-resistant layer comprises at least one of silicon nitride, tungsten carbide and aluminum oxide or a combination thereof.

4. A pipeline (1) according to any one of claims 1 to 3, characterized in that said tubular body (10) is a mild steel tubular body (10).

5. A process for the production of a pipe (1) according to any one of claims 1 to 4, comprising:

roughening the inner wall surface of the pipe body (10);

thermally spraying the substrate layer on the inner wall surface;

thermally spraying the wear layer on the base layer.

6. The method of manufacturing a pipe according to claim 5, further comprising:

and coating a reinforcing layer on the wear-resistant layer by brushing.

7. A concrete machine, comprising:

a body;

the pipe (1) according to any one of claims 1 to 4, said tubular body (10) being provided on said body.