Inner wall coating system

Abstract

The invention discloses an inner wall coating system, which relates to the technical field of coating and comprises a pipe network, a liquid storage cylinder I, a liquid storage cylinder II, a lifting system and a valve system. The pipe network is communicated with a plurality of first connectors which are used for being communicated with the lower ends of the porous ceramic columns. The liquid storage cylinder I is communicated with the pipe network, and the mounting position is higher than the upper end of the porous ceramic column, so that slurry is pressed and fed to the upper end of the porous ceramic column. The second liquid storage cylinder is communicated with the pipe network and used for recycling slurry. The lifting system communicates with the second liquid storage cylinder and the first liquid storage cylinder and is used for lifting the slurry in the second liquid storage cylinder to the first liquid storage cylinder. The valve system comprises a first valve installed on the pipeline between the first liquid storage barrel and the pipe network and a second valve installed on the pipeline between the second liquid storage barrel and the pipe network. Compared with the prior art, the inner wall coating system can improve the consistency of the coating efficiency and the coating effect, and product damage is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of coating, and particularly to an inner wall coating system. Background Art

[0002] For straight pipe parts with a large inner diameter, an inner wall coating process of spraying by inserting a nozzle into the pipe is usually adopted. During spraying, the nozzle is inserted into the straight pipe, and spraying is carried out by using the pressure provided by the pump body. However, for structures such as porous ceramics, whose internal structure is similar to a honeycomb structure, if the inner wall coating process of spraying by inserting a nozzle into the pipe is adopted, the following problems exist:

[0003] 1. Multiple sprayings are required, and the spraying efficiency is low;

[0004] 2. The diameter of the pore channels is small, and the insertion and extraction of the nozzle are likely to cause damage to the product. Summary of the Invention

[0005] The purpose of the present invention is to provide an inner wall coating system to solve the problems existing in the above related technologies, improve the consistency of coating efficiency and coating effect, and avoid causing damage to the product.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The present invention discloses an inner wall coating system, including:

[0008] A pipe network, which is connected with a plurality of first connectors; the first connectors are used to connect the lower ends of porous ceramic columns;

[0009] A first liquid storage cylinder, which is connected to the pipe network and is installed at a position higher than the upper end of the porous ceramic column to press the slurry to the upper end of the porous ceramic column;

[0010] A second liquid storage cylinder, which is connected to the pipe network and is used for recovering the slurry;

[0011] A lifting system, which is respectively connected to the second liquid storage cylinder and the first liquid storage cylinder and is used to lift the slurry in the second liquid storage cylinder to the first liquid storage cylinder;

[0012] A valve system, including a first valve installed on the pipeline between the first liquid storage cylinder and the pipe network, and a second valve installed on the pipeline between the second liquid storage cylinder and the pipe network.

[0013] Preferably, the inner wall coating system further includes a liquid level pipe, the pipe network is connected with a second connector, and the lower end of the liquid level pipe is connected to the second connector.

[0014] Preferably, the lifting system includes a pump body and a pressure barrel. The liquid inlet of the pump body communicates with the second liquid storage cylinder, the liquid outlet of the pump body communicates with the liquid inlet of the pressure barrel, and the liquid outlet of the pressure barrel communicates with the liquid inlet of the first liquid storage cylinder; the pressure barrel communicates with a pressure gas source to press the slurry into the first liquid storage cylinder through the pressure gas.

[0015] Preferably, a first filter is installed on the pipeline between the pump body and the pressure barrel.

[0016] Preferably, the pressure barrel is provided with a stirrer.

[0017] Preferably, the inner wall coating system further includes a slurry pumping system, and the slurry pumping system communicates with the pipe network for pumping out the slurry in the pipe network after the coating is completed; the valve system further includes a valve three, and the valve three is installed on the pipeline between the slurry pumping system and the pipe network.

[0018] Preferably, the slurry pumping system includes a vacuum pump and a vacuum tank; the vacuum pump communicates with the vacuum tank for forming a negative pressure in the vacuum tank; the vacuum tank communicates with the pipe network for pumping out the slurry in the pipe network after the coating is completed; the valve three is installed on the pipeline between the vacuum tank and the pipe network.

[0019] Preferably, a second filter and a check valve are installed on the pipeline between the vacuum pump and the vacuum tank.

[0020] Preferably, the inner wall coating system further includes a bracket, and the bracket includes a frame, a bottom plate and a support; the bottom plate is fixed on the frame, the support is fixed on the bottom plate, and the support supports the pipe network.

[0021] Preferably, the bracket further includes a positioning plate, the positioning plate is located above the pipe network and fixedly connected to the frame, and a plurality of positioning holes are provided on the positioning plate for the porous ceramic columns to pass through.

[0022] The present invention has achieved the following technical effects compared with the related art:

[0023] It can realize the simultaneous coating of a large number of porous ceramic columns and improve the production efficiency;

[0024] It can coat the porous ceramic columns with small apertures and avoid damage to the porous ceramic columns due to collision with the nozzle;

[0025] By using the principle of communicating vessels, the liquid inlet speed and coating time of multiple porous ceramic columns are made consistent, so that the coating effects of multiple porous ceramic columns are kept consistent;

[0026] The slurry can be recycled to avoid waste;

[0027] The coating process is driven by the gravity of the slurry flow, without the need for a pump to maintain the injection high pressure, reducing the requirement for the pump power.

[0028] The preferred embodiment of the present invention also provides the following technical effects:

[0029] The lifting system includes a pump body and a pressure barrel. A first filter is installed on the pipeline between the pump body and the pressure barrel, so as to realize the automatic filtration during the slurry circulation process, prevent large particles and sediments from participating in the subsequent coating process, and avoid blocking the internal pores of the porous ceramic column.

[0030] When the amount of slurry in the first liquid storage cylinder reaches the requirement, the lifting system stops the slurry lifting operation process. At this time, the pressure barrel can directly send the pressurized gas into the first liquid storage cylinder to stir the slurry in the first liquid storage cylinder through the pressurized gas, avoiding precipitation of the slurry inside the first liquid storage cylinder.

[0031] By setting up a slurry pumping system, after the coating operation is completed, the residual slurry in the pipeline network is forced to be discharged, which can avoid blocking of the pipeline network and improve the cleaning efficiency; since the lower part of the porous ceramic column is in contact with the slurry for a long time, when the slurry pumping system works, the excess slurry at the lower part of the porous ceramic column can be pumped out to avoid material accumulation at the lower part, thus ensuring the consistency of the internal coating thickness of the porous ceramic column. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 It is a schematic diagram of a perspective view of the inner wall coating system according to an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of another perspective view of the inner wall coating system according to an embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of a perspective view of a local position where the pipeline network is located;

[0036] Figure 4 It is a schematic diagram of another perspective view of a local position where the pipeline network is located;

[0037] Figure 5 For Figure 1 Schematic diagram with some structures omitted;

[0038] Figure 6 It is the schematic diagram of the principle of the inner wall coating system of this embodiment.

[0039] In the figure: 1 - pipeline network; 2 - first liquid storage cylinder; 3 - second liquid storage cylinder; 4 - valve system; 5 - pump body; 6 - pressure barrel; 7 - liquid level pipe; 8 - vacuum pump; 9 - vacuum tank; 10 - frame; 11 - bottom plate; 12 - support; 13 - positioning plate; 14 - first joint; 15 - second joint; 16 - first valve; 17 - second valve; 18 - third valve; 19 - first filter; 20 - second filter; 21 - check valve; 22 - pressure sensor; 23 - negative pressure controller; 24 - first horizontal pipe; 25 - second horizontal pipe; 26 - third horizontal pipe; 27 - vertical pipe; 28 - docking tooling; 29 - porous ceramic column. Detailed implementation manner

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] The purpose of the present invention is to provide an inner wall coating system to solve the problems existing in the above - related technologies, improve the consistency of coating efficiency and coating effect, and avoid product damage.

[0042] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0043] Refer to Figures 1 to 6 , this embodiment provides an inner wall coating system, including a pipeline network 1, a first liquid storage cylinder 2, a second liquid storage cylinder 3, a lifting system, and a valve system 4.

[0044] The pipeline network 1 is usually horizontally arranged and is connected with a plurality of first joints 14. The first joint 14 is used to connect the lower end of the porous ceramic column 29. The first liquid storage cylinder 2 is connected to the pipeline network 1 and is installed at a position higher than the upper end of the porous ceramic column 29 to press the slurry to the upper end of the porous ceramic column 29. The second liquid storage cylinder 3 is connected to the pipeline network 1 and is used to recover the slurry. The lifting system is respectively connected to the second liquid storage cylinder 3 and the first liquid storage cylinder 2 and is used to lift the slurry in the second liquid storage cylinder 3 to the first liquid storage cylinder 2. The valve system 4 includes a first valve 16 installed on the pipeline between the first liquid storage cylinder 2 and the pipeline network 1, and a second valve 17 installed on the pipeline between the second liquid storage cylinder 3 and the pipeline network 1.

[0045] The working principle of the inner wall coating system in this embodiment is as follows:

[0046] The lifting system lifts the slurry stored in the second liquid storage cylinder 3 to the first liquid storage cylinder 2. Then, the first valve 16 is opened and the second valve 17 is closed. The slurry in the first liquid storage cylinder 2 flows into the pipe network 1 under the action of gravity. Since the installation position of the first liquid storage cylinder 2 is higher than the upper end of the porous ceramic column 29, the slurry flows upward along the internal channels of the porous ceramic column 29 under the action of the pressure difference formed by the height difference, realizing the coating on the inner wall of the porous ceramic column 29.

[0047] Since the structure of the pipe network 1 is in the form of a mesh surface and is provided with a plurality of first joints 14, a plurality of porous ceramic columns 29 can be arranged in an array above the pipe network 1. On the one hand, it can realize the simultaneous coating of a large number of porous ceramic columns 29, improving the production efficiency. On the other hand, the porous ceramic columns 29 are only distributed above the pipe network 1, reducing the space occupation.

[0048] Since the inside of the pipe network 1 is interconnected, according to the principle of communicating vessels, the liquid levels in a plurality of porous ceramic columns 29 are approximately the same, enabling the plurality of porous ceramic columns 29 to have approximately the same coating speed. When their lengths are the same, the coating operations can be completed simultaneously. By adjusting the opening degree of the first valve 16, the coating speed of the porous ceramic columns 29 can be adjusted.

[0049] After the coating is completed, the first valve 16 is closed and the second valve 17 is opened. The slurry in the pipe network 1 will be recycled into the first liquid storage cylinder 2. Then, the lifting system lifts the slurry stored in the second liquid storage cylinder 3 to the first liquid storage cylinder 2, realizing the recycling of the slurry.

[0050] It should be noted that the energy consumption of this inner wall coating system is concentrated in the process of lifting the slurry. During the coating process of the slurry, the slurry flows automatically under the action of gravity without consuming electric energy. Compared with the high-pressure spraying method, the immersion coating method in this embodiment does not require the pump body 5 to maintain the injection high pressure, reducing the requirement for the power of the pump body 5.

[0051] As a possible example, in this embodiment, the inner wall coating system further includes a liquid level tube 7. The pipe network 1 is connected to a second joint 15, and the lower end of the liquid level tube 7 is connected to the second joint 15.

[0052] During the process of the slurry flowing into the pipe network 1, due to the certain flow resistance in the porous ceramic column 29, the air in the pipe network 1 is mainly discharged from the upper end of the liquid level tube 7, realizing the exhaust function of the liquid level tube 7. After the exhaust is completed, the slurry enters the porous ceramic column 29 and the liquid level tube 7.

[0053] It should be noted that although there is a flow resistance in the porous ceramic column 29, causing the liquid level in the liquid level tube 7 to be higher than that in the porous ceramic column 29, by adjusting the opening degree of the first valve 16, the slurry can flow slowly. Therefore, the difference in the liquid level height between the liquid level tube 7 and the porous ceramic column 29 will not be too large. The staff can roughly judge the flow rate of the slurry by observing the rising speed of the liquid level in the liquid level tube 7 and combining their own experience, thus providing an observation basis for adjusting the opening degree of the first valve 16.

[0054] As a possible example, in this embodiment, the lifting system includes a pump body 5 and a pressure barrel 6. The liquid inlet of the pump body 5 is connected to the second liquid storage cylinder 3, the liquid outlet of the pump body 5 is connected to the liquid inlet of the pressure barrel 6, and the liquid outlet of the pressure barrel 6 is connected to the liquid inlet of the first liquid storage cylinder 2. The pressure barrel 6 is connected to a pressure gas source to press the slurry into the first liquid storage cylinder 2 through the pressure gas. The pressure barrel 6 can be purchased on the market and will not be elaborated here.

[0055] Exemplarily, the type of the pump body 5 is a pneumatic diaphragm pump, which is also connected to the pressure gas source and is driven by the pressure gas source.

[0056] When the amount of slurry in the first liquid storage cylinder 2 reaches the requirement, the lifting system stops the lifting operation process of the slurry. At this time, the pressure barrel 6 can directly send the pressure gas into the first liquid storage cylinder 2 to stir the slurry in the first liquid storage cylinder 2 through the pressure gas, avoiding the precipitation of the slurry inside the first liquid storage cylinder 2.

[0057] As a possible example, in this embodiment, a first filter 19 is installed on the pipeline between the pump body 5 and the pressure barrel 6 to realize the automatic filtration of the slurry circulation process, prevent large particles and precipitates from participating in the subsequent coating process, and thus avoid the internal pore channels of the porous ceramic column 29 from being blocked.

[0058] Exemplarily, the type of the first filter 19 is a Y-type filter.

[0059] As a possible example, in this embodiment, the pressure barrel 6 has a stirrer for stirring the internal slurry to avoid the precipitation of the internal slurry. The type of the stirrer can be flexibly selected, such as a paddle stirrer, a magnetic stirrer, etc. The pressure barrel 6 can be purchased on the market and will not be elaborated here.

[0060] As a possible example, in this embodiment, the inner wall coating system further includes a slurry pumping system, which is connected to the pipe network 1 and is used to pump out the slurry in the pipe network 1 after the coating is completed. The valve system 4 further includes a third valve 18, and the third valve 18 is installed on the pipeline between the slurry pumping system and the pipe network 1.

[0061] Due to the poor fluidity of the slurry, it is difficult to be completely drained naturally during the process of flowing to the second liquid storage cylinder 3. After the slurry solidifies in the pipe network 1, the internal flow-through area of the pipe network 1 will be reduced, and even blockage may occur. If the manual cleaning method is adopted, the pipe network 1 needs to be disassembled into pipe sections and pipe joints and cleaned one by one, which is time-consuming and laborious. In this embodiment, by setting up a slurry pumping system, after the coating operation is completed, the residual slurry in the pipe network 1 is forcibly discharged, which can avoid the blockage of the pipe network 1 and improve the cleaning efficiency.

[0062] In addition, since the lower part of the porous ceramic column 29 is in contact with the slurry for a long time, when the slurry pumping system works, the excess slurry at the lower part of the porous ceramic column 29 can be pumped out to avoid the accumulation of materials at the lower part, thereby ensuring the consistency of the coating thickness inside the porous ceramic column 29.

[0063] As a possible example, in this embodiment, the slurry pumping system includes a vacuum pump 8 and a vacuum tank 9. The vacuum pump 8 is connected to the vacuum tank 9 and is used to form a negative pressure inside the vacuum tank 9. The vacuum tank 9 is connected to the pipe network 1 and is used to pump out the slurry in the pipe network 1 after the coating is completed. A third valve 18 is installed on the pipeline between the vacuum tank 9 and the pipe network 1.

[0064] When the slurry pumping system is not working, the third valve 18 is closed. When the slurry pumping system works, the first valve 16 and the second valve 17 are closed, the third valve 18 is opened, and the liquid level tube 7 is used for air intake.

[0065] Figure 6 The dotted connecting line in shows the flow direction of the air flow when the slurry pumping system works. Figure 6 The solid connecting line in shows the flow direction of the slurry.

[0066] Exemplarily, the volumes of the vacuum tank 9 and the first liquid storage cylinder 2 are 200L.

[0067] As a possible example, in this embodiment, a second filter 20 and a check valve 21 are installed on the pipeline between the vacuum pump 8 and the vacuum tank 9.

[0068] The second filter 20 is used to filter the slurry to prevent the slurry from entering the vacuum pump 8. The check valve 21 is used to make the gas flow unidirectionally towards the vacuum pump 8, thereby maintaining the negative pressure inside the vacuum tank 9.

[0069] Exemplarily, the slurry pumping system further includes a pressure sensor 22 and a negative pressure controller 23. The pressure sensor 22 is used to monitor the pressure inside the vacuum tank 9. The negative pressure controller 23 is installed on the pipeline between the vacuum tank 9 and the vacuum pump 8, and has the functions of pressure monitoring and outputting control signals. The negative pressure controller 23 is electrically connected to the vacuum pump 8, and the negative pressure controller 23 is preset with a control pressure.

[0070] The pressure sensor 22 monitors the pressure inside the vacuum tank 9 in real time. The negative pressure controller 23 compares the pressure value it monitors with the control pressure. When the pressure is lower than the control pressure, it sends a control signal to the vacuum pump 8 to stop the vacuum pump 8 from working.

[0071] As a possible example, in this embodiment, the inner wall coating system further includes a bracket, and the bracket includes a frame 10, a bottom plate 11, and a support 12. The bottom plate 11 is fixed to the frame 10, the support 12 is fixed to the bottom plate 11, and the support 12 supports the pipe network 1.

[0072] Exemplarily, the frame 10 is composed of aluminum profiles to reduce the overall weight. The support 12 has a cylindrical surface groove with an upward opening, and the cylindrical surface groove is used to hold the pipe section of the pipe network 1 and limit the pipe section.

[0073] As a possible example, in this embodiment, the bracket further includes a positioning plate 13. The positioning plate 13 is located above the pipe network 1 and is fixedly connected to the frame 10. A plurality of positioning holes are provided on the positioning plate 13, and the positioning holes are for the porous ceramic columns 29 to pass through.

[0074] Exemplarily, the bottom plate 11 is an UPVC (Unplasticized Polyvinyl Chloride) plate, and the positioning plate 13 is a PVC (Polyvinyl chloride) plate.

[0075] Exemplarily, a docking tooling 28 is provided between the first joint 14 and the porous ceramic column 29. One end of the docking tooling 28 is communicated with the first joint 14, and the other end of the docking tooling 28 is communicated with the porous ceramic column 29. The docking tooling 28 can be replaced. For different models of the docking tooling 28, the diameter of the end communicating with the porous ceramic column 29 is different. Thus, by replacing the docking tooling 28, it can adapt to porous ceramic columns 29 with different diameters.

[0076] Exemplarily, the diameter of the porous ceramic column 29 is mostly 30 mm.

[0077] Exemplarily, both the first joint 14 and the docking tooling 28 are straight pipes arranged vertically. The second joint 15 includes a horizontal pipe and a ninety-degree elbow. One end of the horizontal pipe is connected to the pipe network 1, and the other end is connected to one end of the ninety-degree elbow. The other end of the ninety-degree elbow is connected to the lower end of the liquid level pipe 7.

[0078] As a possible example, in this embodiment, the pipe network 1 includes a first horizontal pipe 24, a second horizontal pipe 25, a third horizontal pipe 26, and a plurality of vertical pipes 27. The first ends of the plurality of vertical pipes 27 are connected in parallel to the first horizontal pipe 24, the second ends of the plurality of vertical pipes 27 are connected in parallel to the third horizontal pipe 26, and the first joint 14 is installed on the vertical pipe 27. The first liquid storage cylinder 2 is connected to the first horizontal pipe 24 through a pipeline, and the second liquid storage cylinder 3 is connected to the third horizontal pipe 26 through a pipeline. The first valve 16 is installed on the pipeline between the first liquid storage cylinder 2 and the first horizontal pipe 24, and the second valve 17 is installed on the pipeline between the second liquid storage cylinder 3 and the third horizontal pipe 26.

[0079] During the coating process, the slurry is diverted from the first horizontal pipe 24 into the plurality of vertical pipes 27. After the coating is completed, the slurry is collected from the plurality of vertical pipes 27 into the third horizontal pipe 26, and then recovered into the second liquid storage cylinder 3.

[0080] The second horizontal pipe 25 is perpendicular to and intersects the plurality of vertical pipes 27 at the same time. Both ends of the second horizontal pipe 25 are connected in parallel to the first end of the main pipeline, and the second end of the main pipeline is connected to the vacuum tank 9. When the slurry pumping system is working, the slurry in the pipe network is collected into the second horizontal pipe 25, and then recovered into the vacuum tank 9 through the main pipeline.

[0081] The connection positions of the vertical pipe 27 with the first horizontal pipe 24, the connection position of the vertical pipe 27 with the second horizontal pipe 25, and the connection position of the vertical pipe 27 with the third horizontal pipe 26 are all pipe joints. The adjacent pipe joints are connected through pipe sections. The types of pipe joints include tee pipe joints, cross pipe joints, and elbow pipe joints.

[0082] Adjust the assembly size of the pipe network according to the number of porous ceramic columns 29 to be coated at one time as needed.

[0083] Exemplarily, the pipe joints and pipe sections are made of UPVC (Unplasticized Polyvinyl Chloride). Each valve of the valve system 4 can be of various types such as manual valves, electric valves, and pneumatic valves.

[0084] Exemplarily, the third horizontal pipe 26 is provided with two slurry discharge ports, and the slurry can be discharged into the second liquid storage cylinder 3 at the same time. Two second joints 15 are connected to the horizontal pipe 3, and one liquid level pipe 7 is connected to each second joint 15. When the overall size of the pipe network 1 is relatively large, the two slurry discharge ports can improve the slurry discharge speed, and the two liquid level pipes 7 can exhaust air faster.

[0085] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An inner wall coating system, characterized in that: include: A pipe network is connected with a plurality of joints 1; the joints 1 are used to connect the lower ends of the porous ceramic columns; A liquid storage cylinder 1, connected to the pipe network and installed at a position higher than the upper end of the porous ceramic column, so as to pressurize the slurry to the upper end of the porous ceramic column; Liquid storage cylinder 2, connected to the pipe network, for recovering slurry; A lifting system, connected to the second liquid storage cylinder and the first liquid storage cylinder, respectively, for lifting the slurry in the second liquid storage cylinder to the first liquid storage cylinder; The valve system comprises a valve 1 installed on the pipeline between the first liquid storage cylinder and the pipeline network, and a valve 2 installed on the pipeline between the second liquid storage cylinder and the pipeline network.

2. The inner wall coating system according to claim 1, characterized in that: It also includes a liquid level pipe, the pipe network is connected to a second connector, and the lower end of the liquid level pipe is connected to the second connector.

3. The inner wall coating system according to claim 1, characterized in that: The lifting system includes a pump body and a pressure barrel, the liquid inlet of the pump body is connected to the second liquid storage barrel, the liquid outlet of the pump body is connected to the liquid inlet of the pressure barrel, and the liquid outlet of the pressure barrel is connected to the liquid inlet of the first liquid storage barrel; the pressure barrel is connected to a pressure gas source to pressurize the slurry into the first liquid storage barrel through the pressure gas.

4. The inner wall coating system according to claim 3, characterized in that: A filter 1 is installed on the pipeline between the pump body and the pressure barrel.

5. The inner wall coating system according to claim 3, characterized in that: The pressure tank has a stirrer.

6. The inner wall coating system according to claim 1, characterized in that: It also includes a slurry extraction system, which is connected to the pipe network and is used to extract the slurry in the pipe network after coating is completed; the valve system also includes valve three, and the valve three is installed on the pipeline between the slurry extraction system and the pipe network.

7. The inner wall coating system according to claim 6, characterized in that: The slurry extraction system includes a vacuum pump and a vacuum tank; the vacuum pump is connected to the vacuum tank to form a negative pressure in the vacuum tank; the vacuum tank is connected to the pipe network to extract the slurry in the pipe network after coating is completed; the valve three is installed on the pipeline between the vacuum tank and the pipe network.

8. The inner wall coating system according to claim 7, characterized in that: A second filter and a one-way valve are installed on the pipeline between the vacuum pump and the vacuum tank.

9. The inner wall coating system according to claim 1, characterized in that: It also includes a bracket, which includes a frame, a base plate and a support; the base plate is fixed on the frame, the support is fixed on the base plate, and the support supports the pipe network.

10. The inner wall coating system according to claim 9, characterized in that: The bracket also includes a positioning plate, which is located above the pipe network and fixedly connected to the frame. The positioning plate is provided with a plurality of positioning holes for porous ceramic columns to pass through.

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