Method for removing metal film layer from pipe wall of magnetic filtration coating equipment

Abstract

The invention discloses a method for removing a metal film layer from a pipe wall of a magnetic filtration coating device. The magnetic filtration coating device comprises a hollow filtration pipe, the inner wall of the filtration pipe is covered with a metal film layer, and a cooling water channel is arranged between the inner wall and the outer wall. The method comprises the following steps: S1, providing an energy supply component, the energy supply component is used to heat the metal film layer to a melting temperature; S2, aligning the energy output end of the energy supply component with the outer surface of the metal film layer; S3, introducing cooling water into the cooling water channel to cool the filtration pipe; S4, operating the energy supply component to heat the metal film layer and generate an oxidation reaction, the heated metal film layer and the inner wall of the cooled filtration pipe form a temperature difference, and the metal film layer is separated from the filtration pipe under the action of the oxidation reaction and the temperature difference. The invention utilizes the molten metal film layer to form thermal expansion and contraction when encountering a cold inner wall, thereby generating a large shrinkage deformation, thereby realizing the flake-off of the metal film layer, and thus improving the coating quality.

Description

Technical Field

[0001] The invention relates to the field of magnetic filtration arc coating equipment, and in particular to a method for removing a metal film layer on a pipe wall of a magnetic filtration coating equipment. Background Art

[0002] In the existing multi-arc plasma coating, long-term use will form a very thick film layer on the inner wall of the magnetic filtration elbow or cavity, accumulate a lot of dust, and adsorb gas. Metal materials have good ductility and strong adhesion, and the ionization rate is higher during the coating process. They are easy to deposit to form a strongly bonded thick film, which makes cleaning more difficult. At the same time, the adsorbed gas is released slowly during the vacuum process, and the equipment's exhaust speed time becomes longer; in addition, metal materials have excellent conductivity, and thick films accumulate on the inner wall of the elbow or cavity, causing changes in equipment resistance, insulation failure, and changes in the deposition electric field, and ultimately changes in the material deposited on the product. Therefore, the furnace cavity and the tube wall need to be cleaned regularly to ensure the normal operation of the electric field in the elbow and to ensure the quality of the coating.

[0003] The magnetic filtered arc technology for bent pipes deposits metal and metal-based coatings. Titanium or chromium targets are commonly used as deposition materials. They are highly compatible with the commonly used stainless steel cavity, and the coating stress is small. The bonding between different deposited layers is strong, and large pieces of metal layers are easily deposited. As the coating is continuously deposited, the metal material conducts the insulation of the bent pipe, the potential changes, and a larger proportion of metal ions are deposited on the bent pipe, the output becomes smaller, and the product quality is unqualified.

[0004] The metal film has very good toughness, and conventional physical grinding methods cannot effectively remove the film layer; physical sandblasting requires the removal of the pipe wall or lining, which is time-consuming and inefficient; milling can remove thick films on vertical round pipes, but it may cause milling penetration due to uneven size, and it cannot be operated on special-shaped S-shaped or C-shaped ones; chemical stripping requires the use of chemical reagents and has environmental risks, and the thicker the film, the longer the processing time;

[0005] Therefore, an environmentally friendly and efficient method is needed to remove the metal film layer on the pipe wall, especially on the special-shaped pipe wall, so as to improve the insulation between the pipe walls and stabilize the electric field. Summary of the invention

[0006] The purpose of the present invention is to provide a method for removing a metal film layer on a pipe wall of a magnetic filtration coating device, so as to efficiently remove the metal film layer.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a method for removing a metal film layer from the pipe wall of a magnetic filtration coating device, wherein the magnetic filtration coating device comprises a hollow filtration pipe, the filtration pipe comprises an inner wall and an outer wall, the inner wall is covered with the metal film layer, the metal film layer has an inner surface connected to the inner wall and an exposed outer surface opposite to the inner surface, and a cooling water channel is also arranged between the inner wall and the outer wall, the method comprises the following steps: S1, providing an energy supply component, the energy supply component is used to heat the metal film layer to a melting temperature; S2, aligning the energy output end of the energy supply component with the outer surface of the metal film layer; S3, introducing cooling water into the cooling water channel to cool the filtration pipe; S4, operating the energy supply component to heat the metal film layer and cause an oxidation reaction to occur, the heated metal film layer forms a temperature difference with the cooled inner wall of the filtration pipe, and the metal film layer is separated from the filtration pipe under the action of the oxidation reaction and the temperature difference.

[0008] Preferably, step S4, operating the energy supply component so that the metal film layer is heated up and an oxidation reaction occurs, a temperature difference is formed between the heated metal film layer and the cooled inner wall of the filter pipe, and the metal film layer is separated from the filter pipe under the action of the oxidation reaction and the temperature difference, including: operating the energy supply component and moving the energy output end of the energy supply component corresponding to the distribution area of ​​the metal film layer so that the entire metal film layer is heated up.

[0009] Preferably, the energy supply component includes a welding gun and a welding power supply, the positive electrode of the welding power supply is electrically connected to the filter pipe, and the negative electrode of the welding power supply is electrically connected to the welding gun so that an arc is formed between the metal film layer and the welding gun. In step S4, the energy supply component is operated to heat up the metal film layer and cause an oxidation reaction, and a temperature difference is formed between the heated metal film layer and the cooled inner wall of the filter pipe. The metal film layer is separated from the filter pipe under the action of the oxidation reaction and the temperature difference, including: turning on the welding power supply to form the arc, and the arc is used to heat up the metal film layer to form a temperature difference with the cooled inner wall and separate it.

[0010] Preferably, the welding gun is provided with an electrode, the electrode is electrically connected to the negative electrode of the welding machine power supply, and the electrode extends into the interior of the filter pipe and is aligned with the outer surface of the metal film layer.

[0011] Preferably, the filtration pipe includes a first-stage pipe, the metal film layer includes a first metal film layer located in the first-stage pipe, and the cooling water channel includes a first cooling channel provided in the first-stage pipe. Steps S2 to S4 correspondingly include the following steps: aligning the energy output end of the energy supply component with the outer surface of the first metal film layer; introducing cooling water into the first cooling channel to cool the first-stage pipe; operating the energy supply component to heat up the first metal film layer and cause an oxidation reaction, wherein a temperature difference is formed between the heated first metal film layer and the inner wall of the cooled filtration pipe, and the first metal film layer is separated from the first-stage pipe under the action of the oxidation reaction and the temperature difference.

[0012] Preferably, the filtration pipe also includes a second-stage pipe detachably connected to the first-stage pipe, the second-stage pipe and the first-stage pipe form a bent pipe structure, the metal film layer also includes a second metal film layer located in the second-stage pipe, the cooling water channel also includes a second cooling channel provided in the second-stage pipe, and the method also includes the following steps: disassembling and separating the first-stage pipe from the second-stage pipe and removing the first-stage pipe; aligning the energy output end of the energy supply component with the outer surface of the second metal film layer; introducing cooling water into the second cooling channel to cool the second-stage pipe; operating the energy supply component so that the second metal film layer heats up and undergoes an oxidation reaction, the heated second metal film layer forms a temperature difference with the cooled inner wall of the filtration pipe, and the second metal film layer is separated from the second-stage pipe under the action of the oxidation reaction and the temperature difference.

[0013] Preferably, the first-stage pipeline is provided with a first liquid inlet and a first liquid outlet, the first liquid inlet and the first liquid outlet are connected to the first cooling channel, and the second-stage pipeline is provided with a second liquid inlet and a second liquid outlet, the second liquid inlet and the second liquid outlet are connected to the second cooling channel.

[0014] Preferably, the temperature of the cooling water is less than or equal to 30 degrees, and the current value set on the welding machine power supply is greater than or equal to 180 amps and less than or equal to 300 amps.

[0015] Preferably, the first-stage pipeline and the second-stage pipeline are made of stainless steel.

[0016] Preferably, the metal film layer is made of titanium or chromium.

[0017] Compared with the prior art, the present invention utilizes an energy supply component to ignite the metal film layer. The metal film layer is activated under high temperature and contacts with oxygen to undergo an oxidation reaction. In the process of forming oxides, the volume of the metal film layer increases, resulting in a larger oxidation deformation, and at the same time, heat is released, so that the metal film layer continues to generate high temperature until the melting point of the metal film layer is reached, causing the metal film layer to melt. The cooling water introduced into the filter pipe cools the inner wall of the filter pipe. The molten metal film layer encounters the cold inner wall to form thermal expansion and contraction. The bonding force between the metal film layer and the inner wall decreases rapidly, resulting in a larger shrinkage deformation. Under the action of the oxidation reaction and the temperature difference, the metal film layer falls off in pieces, exposing the original tube wall or cavity wall lining, thereby improving the insulation between the tube walls and the electric field stability, thereby improving the coating quality. The method is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a welding assembly in the method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment of the present invention.

[0019] Figure 2 This is a structural diagram of another welding assembly in the method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment of the present invention.

[0020] Figure 3 for Figure 2 Structural diagram of removing the second metal film layer from the second-stage pipeline after removing the first-stage pipeline. DETAILED DESCRIPTION

[0021] In order to explain the technical content, structural features and achieved effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0022] like Figures 1 to 3 As shown, an embodiment of the present invention discloses a method for removing a metal film layer from a pipe wall of a magnetic filtration coating device, wherein the magnetic filtration coating device comprises a hollow filtration pipe 1, wherein the filtration pipe 1 comprises an inner wall and an outer wall, wherein the inner wall is covered with the metal film layer 2, wherein the metal film layer 2 has an inner surface connected to the inner wall and an exposed outer surface opposite to the inner surface, and a cooling water channel is further provided between the inner wall and the outer wall, wherein the method comprises the following steps:

[0023] S1. Provide an energy supply component, which is used to heat the metal film layer 2 to a melting temperature. Specifically, the metal film layer 2 is made of metal such as titanium or chromium, and the filter pipe 1 is a stainless steel pipe. The energy supply component provides energy to heat the metal film layer 2 to a melting temperature. The structure of the energy supply component is not limited as long as it can operate in the filter pipe 1 and can heat the metal film layer 2 to a desired temperature.

[0024] S2, aligning the energy output end of the energy supply component with the outer surface of the metal film layer 2 to heat the metal film layer 2. For the magnetic filtration coating equipment, when it is necessary to clean the metal film layer 2 on the inner wall of the filter pipe 1, first remove the arc source connected to the end of the filter pipe 1 to expose the inner cavity of the filter pipe 1, and then use the energy supply component to operate.

[0025] S3, introducing cooling water into the cooling water channel to cool the filter pipe 1; using cooling water to cool the filter pipe 1, so that the filter pipe 1 maintains a certain low temperature to form a temperature difference with the heated metal film layer 2, thereby destroying the adhesion between the metal film layer 2 and the inner wall of the filter pipe 1. At the same time, introducing cooling water into the filter pipe 1 also prevents the filter pipe 1 from being affected by high temperature and affecting the performance of the filter pipe 1.

[0026] S4, operates the energy supply component so that the metal film layer 2 is heated and undergoes an oxidation reaction, a temperature difference is formed between the heated metal film layer 2 and the cooled inner wall of the filter pipe 1, and the metal film layer 2 is separated from the filter pipe 1 under the action of the oxidation reaction and the temperature difference.

[0027] The embodiment of the present invention utilizes an energy supply component to ignite the metal film layer 2. The metal film layer 2 is activated under high temperature and contacts with oxygen to undergo an oxidation reaction. In the process of forming oxides, the volume of the metal film layer 2 increases, resulting in a larger oxidation deformation, and heat is released at the same time, so that the metal film layer 2 continues to generate high temperature until the melting temperature of the metal film layer 2 is reached, causing the metal film layer 2 to melt. The cooling water introduced into the filter pipe 1 cools the inner wall of the filter pipe 1. The molten metal film layer 2 encounters the cold inner wall to form thermal expansion and contraction. The bonding force between the metal film layer 2 and the inner wall decreases rapidly, resulting in a larger shrinkage deformation. Under the action of the oxidation reaction and the temperature difference, the metal film layer 2 falls off in pieces, exposing the original tube wall or cavity wall lining, thereby improving the insulation between the tube walls and the electric field stability, thereby improving the coating quality. The method is simple and efficient.

[0028] In the embodiment of the present invention, step S4, operating the energy supply component so that the metal film layer 2 is heated and an oxidation reaction occurs, a temperature difference is formed between the heated metal film layer 2 and the inner wall of the cooled filter pipe 1, and the metal film layer 2 is separated from the filter pipe 1 under the action of the oxidation reaction and the temperature difference, including:

[0029] S41, operate the energy supply component, and move the energy output end of the energy supply component corresponding to the distribution area of ​​the metal film layer 2 to heat up the entire metal film layer 2. By moving the position of the energy output end of the energy supply component, the temperature increase range of the metal film layer 2 is expanded, and the metal film layer 2 is quickly heated up.

[0030] In the embodiment of the present invention, Figures 1 to 3 As shown, the energy supply component includes welding components 3, 30, and the welding components 3, 30 include welding guns 31, 301 and welding machine power supplies 32, 302. The positive electrodes 34, 304 of the welding machine power supplies 32, 302 are electrically connected to the filter pipe 1, and the negative electrodes 35, 305 of the welding machine power supplies 32, 302 are electrically connected to the welding guns 31, 301 so that an arc is formed between the metal film layer 2 and the welding guns 31, 301. In step S4, the energy supply component is operated to heat up the metal film layer 2 and cause an oxidation reaction. The heated metal film layer 2 forms a temperature difference with the inner wall of the cooled filter pipe 1. The metal film layer 2 is separated from the filter pipe 1 under the action of the oxidation reaction and the temperature difference, which includes:

[0031] S411, turn on the welding machine power supply 32, 302 to form the arc, which is used to heat up the metal film layer 2 to form a temperature difference with the cooled inner wall and separate. By using the principle of arc welding and water extraction, the metal film layer 2 is ignited, and the heat is released to melt and oxidize the metal film layer 2, and the cooling water introduced into the filter pipe 1 cools the inner wall of the filter pipe 1. The melted metal film layer 2 encounters the cold inner wall to form thermal expansion and contraction, and the bonding force between the metal film layer 2 and the inner wall decreases rapidly, resulting in a large shrinkage deformation, thereby realizing the flake-off of the metal film layer 2, exposing the original pipe wall or cavity wall lining, improving the insulation between the pipe walls and the electric field stability, and thus improving the coating quality.

[0032] In the embodiment of the present invention, the welding gun 31, 301 is provided with a welding rod 33 or an electrode, the welding rod 33 or the electrode is electrically connected to the negative electrode 35, 305 of the welding machine power supply 32, 302, the welding rod 33 or the electrode corresponds to the energy output end of the energy supply component, and the welding rod 33 or the electrode extends into the interior of the filter pipe 1 and is aligned with the outer surface of the metal film layer 2. Specifically, the welding assembly 3 is one of a argon arc welding assembly, a manual arc brazing welding assembly, and a plasma arc welding assembly. The welding rod 33 or the electrode is arranged in the welding assembly 3 to form an arc, such as Figure 1 As shown, the welding assembly 3 is a hand arc brazing welding assembly, the welding gun 31 is provided with a welding rod 33, the welding rod 33 is relatively long, and the free end of the welding rod 33 extends into the filter pipe 1 to form an arc with the metal film layer 2 to melt the metal film layer 2. In some other embodiments of the present invention, such as Figure 2 and Figure 3 As shown, when the welding assembly 30 is a tungsten inert gas arc welding assembly, the welding gun 301 corresponds to the energy output end of the energy supply assembly, and an electrode is arranged on the welding gun 301. The welding gun 301 extends into the interior of the filter pipe 1 to form an arc with the metal film layer 2 to melt the metal film layer 2.

[0033] Of course, the energy supply component of the embodiment of the present invention can also be other energy supply components such as laser, without limitation, as long as it can operate in the filter pipe 1 and can heat the metal film layer 2 to the required temperature for melting the metal film layer 2.

[0034] In the embodiment of the present invention, Figures 1 to 3 As shown, the filtering pipeline 1 includes a first-stage pipeline 11, the material of the first-stage pipeline 11 is stainless steel, the metal film layer 2 includes a first metal film layer 21 located in the first-stage pipeline 11, and the cooling water channel includes a first cooling channel provided in the first-stage pipeline 11. Steps S2 to S4 correspondingly include the following steps:

[0035] S201 , aligning the energy output end of the energy supply component with the outer surface of the first metal film layer 21 .

[0036] S301 . Introduce cooling water into the first cooling channel to cool the first-stage pipeline 11 .

[0037] S401. Operate the energy supply component to heat up the first metal film layer 21 and cause an oxidation reaction. The heated first metal film layer 21 forms a temperature difference with the cooled inner wall of the filter pipe 1. The first metal film layer 21 is separated from the first-stage pipe 11 under the action of the oxidation reaction and the temperature difference.

[0038] In the embodiment of the present invention, the filtering pipe 1 further includes a second-stage pipe 12 detachably connected to the first-stage pipe 11, the first-stage pipe 11 is made of stainless steel, the second-stage pipe 12 and the first-stage pipe 11 form a curved pipe structure, the metal film layer 2 further includes a second metal film layer 22 located in the second-stage pipe 12, the cooling water channel further includes a second cooling channel provided in the second-stage pipe 12, and the method further includes the following steps:

[0039] S501, disassemble and separate the first-level pipeline 11 and the second-level pipeline 12 and remove the first-level pipeline 11; specifically, since the metal film layer 2 in the curved pipe structure is not easy to clean, the first metal film layer 21 in the first-level pipeline 11 is cleaned first, and then the first-level pipeline 11 is removed after cleaning, so as to more conveniently clean the second metal film layer 22 in the second-level pipeline 12.

[0040] S601 , aligning the energy output end of the energy supply component with the outer surface of the second metal film layer 22 .

[0041] S701 . Introduce cooling water into the second cooling channel to cool the second-stage pipeline 12 .

[0042] S801. Operate the energy supply component to heat up the second metal film layer 22 and cause an oxidation reaction. The heated second metal film layer 22 forms a temperature difference with the cooled inner wall of the filter pipe 1. The second metal film layer 22 is separated from the second-stage pipe 12 under the action of the oxidation reaction and the temperature difference.

[0043] In the embodiment of the present invention, the first-stage pipeline 11 is provided with a first liquid inlet 13 and a first liquid outlet 14, the first liquid inlet 13 and the first liquid outlet 14 are connected to the first cooling channel, and the second-stage pipeline 12 is provided with a second liquid inlet 15 and a second liquid outlet 16, the second liquid inlet 15 and the second liquid outlet 16 are connected to the second cooling channel. Specifically, the first-stage pipeline 11 is provided with a cooling channel formed by the first liquid inlet 13, the first liquid outlet 14 and the first cooling channel being connected, and the second-stage pipeline 12 is provided with a cooling channel formed by the second liquid inlet 15, the second liquid outlet 16 and the second cooling channel being connected, the two cooling channels are separated from each other, and even after the first-stage pipeline 11 is removed, the cooling of the second-stage pipeline 12 will not be affected, and the design is ingenious.

[0044] In the embodiment of the present invention, the temperature of the cooling water is less than or equal to 30 degrees, and the current value set on the welding power supply 32, 302 is greater than or equal to 180 amps and less than or equal to 300 amps. Specifically, the temperature of the cooling water is set as required, as long as the temperature of the filter pipe 1 is low and the temperature difference with the metal film layer 2 is large enough to achieve the shedding of the metal film layer 2.

[0045] In the embodiment of the present invention, Figure 1 As shown, when the welding assembly 3 is a manual arc brazing welding assembly, when the filter pipe 1 needs to be maintained and cleaned, the arc source on the filter pipe 1 is removed, the welding rod 33 is allowed to enter the first-stage pipe 11, the positive electrode 34 of the welding machine power supply 32 is connected to the first-stage pipe 11, and the negative electrode 35 of the welding machine power supply 32 is connected to the welding gun 31, and the cooling water of the chiller is introduced into the first-stage pipe 11, so that the temperature of the inner wall of the first-stage pipe 11 is controlled at 20°C; the current value is set to 200A, the welding machine power supply 32 is turned on, the welding rod 33 is aimed at the first metal film layer 21, and the welding action is performed to ignite the first metal film layer 21, and the sliding welding gun 31 moves the welding position to expand the ignition range of the first metal film layer 21; the ignited first metal film layer 21 quickly burns red, melts at high temperature, releases gas and shrinks in volume, so that the interlayer bonding force of the accumulated multi-layer thick film decreases rapidly. Since the inner wall temperature is 20°C, the bottom layer is quickly cooled down, resulting in a large shrinkage deformation, which promotes the separation of the film layer from the pipe wall. After the first metal film layer 21 of the first-stage pipeline 11 is cleaned, the first-stage pipeline 11 is removed, and the second metal film layer 22 in the second-stage pipeline 12 is cleaned in the same manner.

[0046] In the embodiment of the present invention, Figures 2 to 3 As shown, when the welding component 3 is a tungsten inert gas arc welding component, argon arc welding is used to ignite the metal film layer 2. The argon arc welding arc starting method adopts a high-voltage breakdown arc starting method. First, high frequency and high voltage are applied between the electrode needle (tungsten needle) and the metal film layer 2 to break through the argon gas to make it conductive, and then a continuous current is supplied to ensure the stability of the arc. When the filter pipe 1 needs to be maintained and cleaned, the arc source on the filter pipe 1 is removed, the positive electrode 304 of the welding machine power supply 302 is connected to the first-level pipe 11, and the negative electrode 305 of the welding machine power supply 302 is connected to the welding gun 301. Cooling water is introduced into the first-level pipe 11 to control the temperature of the inner wall of the first-level pipe 11 at 23°C; the current value is set to 250A, the welding machine power supply 302 is turned on, and the welding gun 301 is aimed at the first metal film layer 21 to perform welding and ignite the first metal film layer 21. The sliding welding gun 301 moves the welding position to expand the ignition range of the first metal film layer 21; the ignited film layer quickly turns red, melts at high temperature, releases gas and shrinks in volume, causing the accumulated multi-layer thick film interlayer bonding force to drop rapidly. Since the inner wall temperature is 23°C, the bottom layer is quickly cooled, resulting in a large shrinkage deformation, which promotes the separation of the first metal film layer 21 from the pipe wall. After the first metal film layer 21 of the first-level pipe 11 is cleaned, the first-level pipe 11 is removed, such as Figure 3 As shown, the second metal film layer 22 in the second-stage pipeline 12 is cleaned in the same manner.

[0047] The embodiment of the present invention adopts arc welding and water extraction method, which has simple principle, flexible operation and low cost; the embodiment of the present invention is suitable for cleaning metal or metal-based film layers, especially thick films in curved pipes of magnetic filtration coating equipment; compared with sandblasting, milling, chemical stripping and other methods, the cleaning depth and area are larger, the cleaning effect is more thorough, and it is efficient and environmentally friendly.

[0048] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A method for removing a metal film layer from a pipe wall of a magnetic filtration coating device, characterized in that: The magnetic filtration coating device comprises a hollow filtration pipe, the filtration pipe comprises an inner wall and an outer wall, the inner wall is covered with the metal film layer, the metal film layer has an inner surface connected to the inner wall and an exposed outer surface opposite to the inner surface, a cooling water channel is further provided between the inner wall and the outer wall, and the method comprises the following steps: S1, providing an energy supply component, wherein the energy supply component is used to heat the metal film layer to a melting temperature; S2, aligning the energy output end of the energy supply component with the outer surface of the metal film layer; S3, introducing cooling water into the cooling water channel to cool the filter pipe; S4, operating the energy supply component to heat up the metal film layer and cause an oxidation reaction, forming a temperature difference between the heated metal film layer and the cooled inner wall of the filter pipe, and separating the metal film layer from the filter pipe under the action of the oxidation reaction and the temperature difference.

2. The method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment according to claim 1, characterized in that: Step S4, operating the energy supply component so that the metal film layer is heated and an oxidation reaction occurs, a temperature difference is formed between the heated metal film layer and the cooled inner wall of the filter pipe, and the metal film layer is separated from the filter pipe under the action of the oxidation reaction and the temperature difference, including: The energy supply component is operated, and the energy output end of the energy supply component is moved corresponding to the distribution area of ​​the metal film layer so that the temperature of the entire metal film layer is increased.

3. The method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment according to claim 1, characterized in that: The energy supply component includes a welding gun and a welding power supply, the positive electrode of the welding power supply is electrically connected to the filter pipe, and the negative electrode of the welding power supply is electrically connected to the welding gun so that an arc is formed between the metal film layer and the welding gun. In step S4, the energy supply component is operated so that the metal film layer is heated and an oxidation reaction occurs, and a temperature difference is formed between the heated metal film layer and the cooled inner wall of the filter pipe, and the metal film layer is separated from the filter pipe under the action of the oxidation reaction and the temperature difference, which includes: The welding machine power supply is turned on to form the electric arc, and the electric arc is used to heat up the metal film layer so as to form a temperature difference with the cooled inner wall and separate the metal film layer.

4. The method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment according to claim 3, characterized in that: The welding gun is provided with an electrode, the electrode is electrically connected to the negative electrode of the welding machine power supply, and the electrode extends into the interior of the filter pipe and is aligned with the outer surface of the metal film layer.

5. The method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment according to claim 1, characterized in that: The filtration pipeline includes a first-stage pipeline, the metal film layer includes a first metal film layer located in the first-stage pipeline, the cooling water channel includes a first cooling channel located in the first-stage pipeline, and steps S2 to S4 correspondingly include the following steps: Aligning the energy output end of the energy supply component with the outer surface of the first metal film layer; Passing cooling water into the first cooling channel to cool the first-stage pipeline; The energy supply component is operated to heat up the first metal film layer and cause an oxidation reaction. The heated first metal film layer forms a temperature difference with the cooled inner wall of the filter pipe. The first metal film layer is separated from the first-stage pipe under the action of the oxidation reaction and the temperature difference.

6. The method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment according to claim 5, characterized in that: The filtration pipeline also includes a second-stage pipeline detachably connected to the first-stage pipeline, the second-stage pipeline and the first-stage pipeline form a bent pipe structure, the metal film layer also includes a second metal film layer located in the second-stage pipeline, the cooling water channel also includes a second cooling channel located in the second-stage pipeline, and the method also includes the following steps: Disassemble and separate the first-stage pipeline from the second-stage pipeline and remove the first-stage pipeline; Aligning the energy output end of the energy supply component with the outer surface of the second metal film layer; Passing cooling water into the second cooling channel to cool the second-stage pipeline; The energy supply component is operated to heat up the second metal film layer and cause an oxidation reaction. The heated second metal film layer forms a temperature difference with the cooled inner wall of the filter pipe. The second metal film layer is separated from the second-stage pipe under the action of the oxidation reaction and the temperature difference.

7. The method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment according to claim 6, characterized in that: The first-stage pipeline is provided with a first liquid inlet and a first liquid outlet, and the first liquid inlet and the first liquid outlet are connected to the first cooling channel. The second-stage pipeline is provided with a second liquid inlet and a second liquid outlet, and the second liquid inlet and the second liquid outlet are connected to the second cooling channel.

8. The method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment according to claim 3, characterized in that: The temperature of the cooling water is less than or equal to 30 degrees, and the current value set on the welding machine power supply is greater than or equal to 180 amps and less than or equal to 300 amps.

9. The method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment according to claim 6, characterized in that: The first-stage pipeline and the second-stage pipeline are made of stainless steel.

10. The method for removing the metal film layer on the pipe wall of the magnetic filtration coating equipment according to claim 9, characterized in that: The material of the metal film layer is titanium or chromium.

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