Spraying device for inner wall of pipeline and using method and application of spraying device

Abstract

The invention provides a spraying device for the inner wall of a pipeline and a using method and application of the spraying device. The spraying device comprises a motor and a conveying shaft, the motor is used for driving the conveying shaft to move, one end of the conveying shaft is connected with a spray gun, and the spray gun comprises a mixing bin and a nozzle; the conveying pipe A and the conveying pipe B are respectively used for conveying the component A and the component B and are fixedly connected to the conveying shaft; the conveying pipe A and the conveying pipe B are respectively communicated with a mixing bin which is communicated with a nozzle and a pressurizing device. The spraying device can be used for spraying on the inner wall of the shield slurry conveying pipeline to form a wear-resistant protective lining, and the wear resistance of the shield slurry conveying pipeline can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to a spraying device for the inner wall of a pipeline and a use method and application thereof. Background Art

[0002] In the construction of shield machine using mud balance method, the mud (including sand, gravel, slag, etc.) in the cutter head of the shield machine needs to be transported to the ground, separated by mud and water treatment equipment, and then the new mud is transported to the shield machine for use in shield construction excavation. In order to meet the demand for mud transportation, there are usually two mud transportation pipes between the shield machine and the ground mud and water treatment equipment, namely, the inlet and outlet pipes, one for the inlet pipe to transport new mud, and the other for the outlet pipe, which is used for the shield machine to discharge mud. The outlet pipe transports the mud, slag and gravel in the cutter head to the ground mud and water treatment equipment. Since the mud in the cutter head of the shield machine contains a large amount of sand, stone, soil, etc., the mud specific gravity is between 1.2-1.4kg / L, and the mud transportation pressure is above 5bar, the mud has a very large impact and wear on the outlet pipe, especially at each elbow, the outlet pipe is often worn through. Frequent shutdowns caused by pipeline damage have become a key factor restricting the efficiency of slurry shield excavation.

[0003] According to the wear condition of the slurry pipe during shield machine construction, domestic shield construction mainly selects slurry pipes made of thickened steel plates such as Q325 or 16Mn. However, this type of pipe is still often worn through by the mud. Therefore, how to effectively improve the wear resistance of the shield mud conveying pipeline is one of the difficult problems that skilled technicians are working on.

[0004] CN220338245U discloses an anti-stuck pump-abrasion-resistant shield mud conveying system for calcareous nodule formations, including a calcareous nodule crushing and processing component and an abrasion-resistant mud conveying pipeline; the calcareous nodule crushing and processing component includes a calcareous nodule crusher, a steel filter screen, and a "Z"-shaped slurry discharge pipeline, which can repeatedly crush the calcareous nodules in the slag until the particle size is less than 20mm; the abrasion-resistant mud conveying pipeline is made of nickel-chromium alloy, and the design hardness is about 1.2 times that of the calcareous nodules. The pipeline cross section adopts an eccentric structure design, which can improve the abrasion resistance and impact resistance. The system is complex in structure and has a high cost.

[0005] CN206439526U discloses an inlaid wear-resistant flexible joint, which is made of carbon steel material. By inlaying a steel wear-resistant bushing in the flexible joint of the existing shield machine mud hose, the shield machine flexible joint is protected from direct impact and wear of the rubber hose during the slag transportation process, thereby extending the service life of the flexible joint, increasing the working time of the shield machine, and improving the shield tunneling efficiency. However, this method is costly and has poor wear resistance. Summary of the invention

[0006] The present invention provides a spraying device for the inner wall of a pipeline, by which a mixture of component A and component B or a product generated by a reaction of component A and component B can be automatically and evenly sprayed on the inner wall of the pipeline, which has the advantage of convenient construction and can form a functional protective coating on the inner wall of the pipeline. The spraying device can be used for a shield mud conveying pipeline, and spraying the inner wall of the shield mud conveying pipeline to form a wear-resistant protective lining, thereby improving the wear resistance of the shield mud conveying pipeline.

[0007] The technical solution provided by the present invention is: a spraying device for the inner wall of a pipeline, comprising a motor and a transmission shaft;

[0008] The motor is used to drive the conveying shaft to move, one end of the conveying shaft is connected to a spray gun, and the spray gun includes a mixing chamber and a spray head;

[0009] A delivery pipe for delivering component A is fixedly connected to the delivery shaft;

[0010] A B delivery pipe for delivering component B is fixedly connected to the delivery shaft;

[0011] One end of the A delivery pipe is connected to the A component silo, and the other end is connected to the mixing silo;

[0012] One end of the B delivery pipe is connected to the B component silo, and the other end is connected to the mixing silo;

[0013] The mixing chamber is communicated with the nozzle, and the mixing chamber is connected to the pressurizing device.

[0014] The A conveying pipe may be connected to the conveying shaft in any manner, including bonding, connection via a fixing member, etc., for example, connection to the conveying shaft via a clamp.

[0015] The B delivery pipe may be connected to the delivery shaft in any manner, including bonding, connection via a fixing member, etc., for example, connection to the delivery shaft via a clamp.

[0016] The nozzles are not limited and include electric nozzles and manual nozzles.

[0017] Preferably, the spray holes on the spray head are evenly distributed. Preferably, the spray holes on the spray head form a ring shape.

[0018] Preferably, the conveying shaft is retractable.

[0019] When in use, the motor drives the conveying shaft to move inside the pipeline, drives the spray gun to move inside the pipeline, opens the valve of the component A silo and the valve of the component B silo, and the component A enters the mixing silo through the component A pipeline, and the component B enters the mixing silo through the component B pipeline. The mixture of the components A and B in the mixing silo is sprayed onto the inner wall of the pipeline through the nozzle under the pressurized action of the pressurizing device.

[0020] Preferably, the mixture is sprayed onto the inner wall of the pipe and then solidified to form a coating. Further preferably, the coating is a functional protective coating, such as a wear-resistant, water-resistant, etc.

[0021] When component A and component B react after mixing and are easy to solidify, preferably, component A and component B are sprayed onto the inner wall of the pipe immediately after mixing in the mixing chamber, and form a coating after solidification.

[0022] The spraying device of the present invention can be used for shield mud conveying pipelines, and spraying the inner wall of the shield mud conveying pipelines to form a wear-resistant protective lining, thereby improving the wear resistance of the shield mud conveying pipelines and solving the technical problem that the shield mud pipelines are often worn through.

[0023] After experimental exploration, the inventors found that spraying polyurea on the inner wall of the shield mud conveying pipe can form a polyurea coating with excellent wear resistance, thereby improving the wear resistance of the shield mud conveying pipe, thereby increasing its service life. At the same time, it can solve the problem of low efficiency of slurry shield tunneling caused by frequent shutdowns due to damage to the shield mud conveying pipe.

[0024] Polyurea is produced by the reaction of isocyanate components and amino compound components. When polyurea is used as the wear-resistant protective layer on the inner wall of the shield mud conveying pipeline, it has the following beneficial effects:

[0025] (1) Polyurea does not contain any volatile organic compounds (VOC), the VOC content is 0, it is pollution-free, low-cost, and has good economic benefits;

[0026] (2) The bonding strength between polyurea and the shield slurry conveying pipeline substrate is excellent, not easy to fall off, and has good wear resistance. The molecular chain structure of the polyurea material is relatively tight, and the coating formed after curing has high hardness, toughness and durability, and can effectively resist physical damage caused by mechanical wear, friction, impact and other factors; 750g / 500r friction test is a test method for evaluating the wear resistance of materials. After the 750g / 500r friction test, the wear value of the polyurea protective coating formed by curing the inner wall of the shield slurry conveying pipeline is less than 0.005g, preferably less than 0.004g, which proves that the polyurea protective coating has excellent wear resistance;

[0027] (3) Polyurea is not only suitable for medium temperature range of -50℃-150℃, but also has low density, vibration absorption and mechanical impact resistance;

[0028] (4) The wear resistance of polyurea enables it to effectively protect the base materials of shield mud conveying pipelines, such as concrete and steel structures, in a variety of environments, extending their service life.

[0029] The polyurea coating of the present invention can be used in newly manufactured shield mud conveying pipelines, and can also be used in existing shield mud conveying pipelines that have been worn. It is evenly sprayed on the inner wall of the shield mud conveying pipeline using certain technical means, and the high bonding strength between the polyurea coating and the inner wall of the pipeline is utilized to make the polyurea coating and the pipeline become one, thereby providing the pipeline with super excellent wear resistance.

[0030] The present invention also proposes a method for forming a polyurea protective coating on the inner wall of a shield mud conveying pipeline using the spraying device, that is, the motor drives the transmission shaft to move inside the shield mud conveying pipeline, drives the spray gun to move inside the shield mud conveying pipeline, uses the isocyanate component as component A, and uses the amino compound component as component B. After the components A and B are mixed in a mixing bin, they are sprayed onto the inner wall of the shield mud conveying pipeline under the pressure of a pressurizing device, and form a protective coating after curing. Considering that the components A and B are cured very quickly after mixing, it is preferred that the components A and B are sprayed onto the inner wall of the shield mud conveying pipeline immediately after mixing in the mixing bin, and form a protective coating after curing. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of a spraying device for the inner wall of a pipeline in an embodiment of the present invention.

[0032] Figure 1 The reference numerals in the drawings are: motor 1, conveying shaft 2, A conveying pipe 3, B conveying pipe 4, A component silo 5, B component silo 6, pressurizing device 7, mixing silo 8, nozzle 9, spray gun 10. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with embodiments. It should be pointed out that the embodiments described below are intended to facilitate the understanding of the present invention, and non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0034] The words “include”, “including” and the like used in the present invention should be interpreted as including rather than being exclusive or exhaustive; that is, the meaning is “including but not limited to”.

[0035] like Figure 1As shown, the spraying device for the inner wall of the pipeline includes a motor 1 and a conveying shaft 2. The motor 1 is used to drive the conveying shaft 2 to move, and one end of the conveying shaft 2 is connected to the spray gun 10. The spray gun 10 includes a mixing chamber 8 and a nozzle 9. The conveying shaft 2 is fixedly connected to the A conveying pipe 3 and the B conveying pipe 4. The A conveying pipe 3 is used to convey the A component, one end of which is connected to the A component silo 5, and the other end is connected to the mixing chamber 8. The B conveying pipe 4 is used to convey the B component, one end of which is connected to the B component silo 6, and the other end is connected to the mixing chamber 8. The mixing chamber 8 is connected to the nozzle 9, and the mixing chamber 8 is connected to the pressurizing device 7.

[0036] In this embodiment, the A delivery pipe 3 is fixedly connected to the delivery shaft 2 via a clamp, and the B delivery pipe 4 is fixedly connected to the delivery shaft 2 via a clamp.

[0037] In this embodiment, the nozzle 9 is an annular nozzle with nozzle holes evenly arranged around the periphery. In some embodiments, the nozzle may be an electric rotating nozzle.

[0038] In this embodiment, the transmission shaft 2 is retractable.

[0039] When in use, the motor 1 drives the conveying shaft 2 to move inside the pipeline, driving the spray gun 10 to move inside the pipeline, opening the valve of the component A silo 5 and the valve of the component B silo 6, and the component A enters the mixing silo 8 through the component A pipeline 3, and the component B enters the mixing silo 8 through the component B pipeline 4. The mixture of the components A and B in the mixing silo 8 is sprayed onto the inner wall of the pipeline through the nozzle 9 under the pressurized action of the pressurizing device 7. As the conveying shaft 2 continues to move forward, the inner wall of the pipeline can be evenly sprayed, and a functional protective layer can be formed on the inner wall of the pipeline.

[0040] The spraying device can be used to form a wear-resistant protective lining on the inner wall of a shield mud conveying pipeline, thereby improving the wear resistance of the shield mud conveying pipeline and solving the technical problem that the shield mud pipeline is often worn through.

[0041] In this embodiment, the wear-resistant protective lining of the inner wall of the shield mud conveying pipeline is a polyurea coating. The method of forming the polyurea protective coating on the inner wall of the shield mud conveying pipeline using the spraying device is as follows:

[0042] The isocyanate component is used as the A component, and the amino compound component is used as the B component.

[0043] The motor 1 drives the transmission shaft 2 to move inside the shield mud conveying pipeline, driving the spray gun 10 to move inside the shield mud conveying pipeline; after the components A and B are mixed in the mixing bin 8, they are immediately sprayed out to the inner wall of the shield mud conveying pipeline through the nozzle under the pressurized action of the pressurizing device 7, and a polyurea protective coating is formed after solidification. The coating has uniform thickness, excellent bonding strength with the substrate of the shield mud conveying pipeline, is not easy to fall off, has high hardness, is tough and durable, has good wear resistance, and can effectively resist physical damage caused by mechanical wear, friction, impact and other factors. After a 750g / 500r friction test, the wear value of the polyurea protective coating formed by solidification of the inner wall of the shield mud conveying pipeline is about 0.003g, proving that the polyurea protective coating has excellent wear resistance.

[0044] The above-described embodiments provide a detailed description of the technical solutions of the present invention. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, supplements or similar substitutions made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A spraying device for the inner wall of a pipeline, characterized in that: Including a motor and a transmission shaft; The motor is used to drive the conveying shaft to move, one end of the conveying shaft is connected to a spray gun, and the spray gun includes a mixing chamber and a spray head; A delivery pipe for delivering component A is fixedly connected to the delivery shaft; A B delivery pipe for delivering component B is fixedly connected to the delivery shaft; One end of the A delivery pipe is connected to the A component silo, and the other end is connected to the mixing silo; One end of the B delivery pipe is connected to the B component silo, and the other end is connected to the mixing silo; The mixing chamber is communicated with the nozzle, and the mixing chamber is connected to the pressurizing device.

2. The spraying device according to claim 1, characterized in that: The conveying shaft is retractable.

3. The spraying device according to claim 1, characterized in that: The connection method between the A conveying pipe and the conveying shaft includes bonding and connection through a fixing member; Preferably, the A delivery pipe is connected to the transmission shaft via a clamp.

4. The spraying device according to claim 1, characterized in that: The connection method between the B conveying pipe and the conveying shaft includes bonding and connection through a fixing member; Preferably, the B delivery pipe is connected to the transmission shaft via a clamp.

5. The spraying device according to claim 1, characterized in that: The spray holes on the spray head are evenly distributed; Preferably, on the nozzle, the spray hole is formed in a ring shape; Preferably, the nozzle is an electric rotating nozzle.

6. The method for using the spraying device according to any one of claims 1 to 5, characterized in that: The motor drives the conveying shaft to move inside the pipeline, driving the spray gun to move inside the pipeline; Open the valve of the component A silo and the valve of the component B silo, component A enters the mixing silo through the component A pipeline, and component B enters the mixing silo through the component B pipeline. Component A and component B are mixed in the mixing silo, and the mixture is sprayed out to the inner wall of the pipeline through the nozzle under the pressure of the pressure device.

7. The method of use according to claim 6, characterized in that: The component A and the component B are sprayed out immediately after mixing in the mixing chamber; Preferably, the mixture is sprayed onto the inner wall of the pipe through a nozzle to form a functional protective layer on the inner wall of the pipe.

8. A method for improving the wear resistance of shield mud conveying pipeline, characterized by: A wear-resistant coating is formed on the inner wall of a shield slurry conveying pipeline using the spraying device described in any one of claims 1 to 5, wherein the wear-resistant coating is a polyurea coating.

9. The method according to claim 8, characterized in that: Through a 750g / 500r friction test, the abrasion value of the polyurea protective coating is less than 0.005g, preferably less than 0.004g.

10. The method according to claim 8, characterized in that: The motor drives the transmission shaft to move inside the shield mud conveying pipeline, driving the spray gun to move inside the shield mud conveying pipeline; The isocyanate component is used as component A, and the amino compound component is used as component B. The component A and the component B are mixed in a mixing bin and then sprayed onto the inner wall of the shield mud conveying pipeline through a nozzle, and a polyurea coating is formed after curing; Preferably, the component A and the component B are immediately sprayed onto the inner wall of the shield mud conveying pipeline through a nozzle after being mixed in the mixing bin, and form a polyurea coating after solidification.

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