A lock chain fluidized powder gun structure for an internal epoxy roll coating process and a working method thereof

Abstract

This invention discloses a chain-driven fluidized bed powder gun structure and its working method for internal epoxy roller coating process, relating to the field of anti-corrosion steel pipe coating technology. It includes a gun barrel body with a polygonal bending structure. The bottom of the gun barrel body is provided with a locking chain structure and a locking lock body. The chain structure extends along the axis of the gun barrel body, and the locking lock body opens or closes when it moves linearly. A fluidizing cloth is provided inside the gun barrel body, forming a gas cavity between the fluidizing cloth and the gun barrel body for gas flow. A fluidizing air inlet is provided on the side of the gun barrel body. This invention improves upon the traditional flipping method by using the locking chain structure and the locking lock body to open or close the powder gun's discharge port for material feeding. By creating a gas cavity filled with flowing gas through the fluidizing cloth and air inlet, the epoxy powder inside the powder gun remains in a fluidized state, achieving a cooling effect and solving the problem of powder agglomeration after prolonged use.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion steel pipe coating technology, specifically to a chain fluidized powder gun structure and its working method for internal epoxy roller coating process. Background Technology

[0002] In recent years, with the rapid development of urbanization and large-scale water conservancy projects in my country, anti-corrosion steel pipes have been widely used. Among them, pipes with epoxy powder coating on the inner wall have become the most widely used anti-corrosion type in the industry. This type of internal epoxy anti-corrosion pipe (especially the conventional anti-corrosion types on the market, such as internal epoxy and external PE and internal epoxy and external 3PE) has been fully recognized and widely used in the anti-corrosion pipeline industry due to its good hygiene performance, strong corrosion resistance, long service life and low friction coefficient.

[0003] There are two conventional processes for producing internal epoxy anti-corrosion pipes: internal wall spraying and internal wall roller coating. Both use steel pipes as the substrate. In the internal wall roller coating process, the steel pipe is heated to a certain temperature and then placed on a turntable for rapid rotation. Powder guns at both ends simultaneously enter the inner wall of the pipe. After reaching the designated position, the pipe is flipped to drop powder or sprayed. The epoxy powder is evenly coated on the inner wall of the steel pipe while it is rotating rapidly. Finally, after natural cooling, it becomes the finished internal epoxy anti-corrosion pipe. The pipe produced by this process has a relatively smooth inner wall, less powder drift, and fewer powder nodules. However, in actual production, the inventors found that the internal wall roller coating process has problems such as gun rod deformation due to heat, powder agglomeration, uneven heating of the steel pipe, large color difference in the coating appearance, and inapplicability to small-diameter pipes.

[0004] The specific details are as follows:

[0005] In the roller coating process, the powder gun rotation and powder delivery are crucial. The standard length of conventional tubing is 12 meters per piece, and the gun barrel length at both ends must be at least 7.5 meters. These are typically made of high-hardness stainless steel with folded edges. However, regardless of the material, thin-walled gun barrels have poor bending resistance and are prone to bending; while thicker barrels increase strength, they also increase weight and sag. Therefore, the longer gun extension distance leads to a greater overall sag, making this roller coating process prone to friction against the inner wall in small-diameter tubing (below 426mm). During high-temperature coating, the rapid rotation of the tubing and the molten powder at high temperatures, combined with the friction from the sag gun barrel, can easily damage the coating, causing leaks on the inner wall.

[0006] On the other hand, during the powder gun flipping process, the gun rod needs to be flipped 180° or 360° to pour powder. The fulcrum and power of the flipping mechanism can only be set at the very end. Therefore, how to fix one end of the gun rod and rotate the gun rod while keeping the rotation amplitude small has become the bottleneck of the gun rod structure design. The existing gun rod has the problem of large twisting and swing amplitude and large vibration during the flipping process, which cannot meet the production needs of small diameter pipes.

[0007] Furthermore, since the gun body is made of thin-walled stainless steel and no cooling zone system is installed, the epoxy powder is prone to agglomeration and powder nodules after entering the heated steel pipe with the powder gun under the influence of high temperature. This leads to uneven powder distribution, which in turn affects the uniformity and anti-corrosion performance of the anti-corrosion coating on the inner wall of the pipe.

[0008] Furthermore, due to the length of the steel pipe, the temperature of the heated steel pipe is uneven along its length, generally with a higher temperature in the middle and a lower temperature at both ends. When the powder guns at both ends penetrate deep into the inner wall of the pipe and apply powder by flipping the powder guns, the temperature difference between different parts can easily lead to differences in the coating color, which in turn affects the uneven performance of the coating inside the pipe.

[0009] Currently, the published Chinese patent CN 217043269U discloses a perforated powder gun structure for producing inner epoxy pipes using a roller coating process. By creating several holes in the gun barrel, the weight of the barrel itself is reduced, as is the bending and drooping height of the long barrel. This allows the gun barrel to remain suspended above the inner wall of the pipe during the flipping process, avoiding friction with the pipe wall. However, this structure does not change the method of fixing one end of the gun barrel and flipping it 180 or 360 degrees to dispense the material. Prolonged use leads to severe deformation, which, once deformed, fails to meet the corrosion protection requirements of small-diameter pipes. Furthermore, the material is poured directly into the inner wall of the steel pipe during the flipping process, and the temperature difference within the steel pipe can easily cause inconsistencies in coating color and performance. In addition, the gun body has poor heat insulation, and the problem of clumping remains prominent. Summary of the Invention

[0010] To address one or more shortcomings of the existing technology, this invention provides a chain fluidized powder gun structure and its working method for internal epoxy roller coating process. It changes the powder discharge mode of the powder gun, achieves uniform powder discharge without the need for powder gun flipping, and can effectively solve problems such as epoxy powder agglomeration and large color difference in coating appearance.

[0011] To achieve the above objectives, the present invention adopts one or more of the following technical solutions:

[0012] In a first aspect, a chain fluidized powder gun structure for internal epoxy roller coating process is provided, including a gun barrel body with a polygonal bending structure, and a locking chain structure and a locking body are provided at the bottom of the gun barrel body. The locking chain structure extends along the axial direction of the gun barrel body, and the locking body drives the locking chain structure to open or close when it moves linearly.

[0013] A fluidizing cloth is provided on the inner side of the gun barrel body, and a gas cavity is formed between the fluidizing cloth and the gun barrel body for gas to flow through. A fluidizing air inlet is provided on the side of the gun barrel body for injecting gas into the cavity so that the powder in the gun barrel body is always in a fluidized state.

[0014] As a further implementation, the gun barrel body includes an integrally formed folded edge, a vertical panel, an inclined plate, and a base plate. Two vertical panels are provided and are respectively vertically arranged on both sides of the base plate. The bottom of the vertical panel is fixedly connected to the base plate through the inclined plate. The folded edge is fixedly arranged on the top of the vertical panel and extends outward. A reinforcing wing is fixedly provided at the bottom of the folded edge.

[0015] As a further implementation, the fluidizing air inlet is disposed on the inclined plate and extends to the air chamber; at least two fluidizing air inlets are provided, respectively arranged on both sides of the gun barrel body.

[0016] As a further implementation, one end of the meshing chain structure is fixedly connected to the gun barrel body, and the other end is flexibly connected to the gun barrel body; preferably, one end of the meshing chain structure is riveted to the gun barrel body, and the other end is flexibly bonded to the gun barrel body. When powder falls from the open meshing chain structure, it can cause one end of the flexible connection of the meshing chain structure to hang down, avoiding material sag.

[0017] As a further implementation, the engaging lock body is driven by a reciprocating transmission device, which includes a drive motor, a pulley adjustment mechanism, a reciprocating connecting belt, and a belt connecting joint. The output shaft of the drive motor is connected to the pulley adjustment mechanism, and the outer side of the pulley adjustment mechanism is connected to the reciprocating connecting belt. Under the drive of the drive motor, the reciprocating motion of the reciprocating connecting belt is realized. The belt connecting joint is provided on the reciprocating connecting belt, and the belt connecting joint is fixedly connected to the engaging lock body. When the drive motor starts, the belt reciprocates by rotating the motor in both forward and reverse directions, thereby driving the engaging lock body to reciprocate in the horizontal direction, thus opening or locking the engaging chain structure. This allows for automatic powder feeding onto the inner wall of the tube for the roller coating process, achieving corrosion prevention and solving the problem of traditional gun barrel flipping.

[0018] As a further implementation, the fluidizing cloth is disposed on the inner side of the vertical panel and the inclined plate, and the upper end of the fluidizing cloth is fixedly connected to the folded edge to ensure that the powder inside the gun barrel body is in a fluidized state, thereby preventing the powder from clumping or adhering to the inner wall of the pipe and making it difficult to clean.

[0019] As a further implementation, the fluidizing fabric is made of a breathable material, preferably cotton fabric.

[0020] As a further implementation, the fluidized air inlet is connected to an external air compressor to provide compressed air into the air chamber, thereby cooling and self-cleaning the gun barrel body, facilitating color replacement, and solving the problem of powder clumping caused by long-term use.

[0021] As a further implementation, the gun barrel body is formed by multiple folding of stainless steel, resulting in high overall strength and strong resistance to bending.

[0022] As a further implementation, the gun barrel body is divided into three parts connected in sequence: a first section, a middle section, and a tail section. The diameter of the gun barrel body decreases from the first section to the tail section in order to improve the strength of the gun barrel body and reduce deformation.

[0023] A method for operating a chain fluidized bed powder gun structure for an internal epoxy roller coating process as described in any of the above claims includes the following steps:

[0024] After the steel pipe is heated, the surface temperature of each section of the steel pipe is obtained, the temperature difference between each section is calculated, and the cooling rate of the steel pipe is recorded.

[0025] The required cooling time between the middle and both ends of the steel pipe is calculated based on the temperature difference between the pipe sections and the cooling rate of the steel pipe.

[0026] Start the drive motor to move the locking body from the middle to both ends to open the interlocking chain structure for material feeding, and control the speed of the drive motor so that the time interval from feeding from the middle to feeding from both ends is the required cooling time.

[0027] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0028] 1. The chain fluidized powder gun structure of the present invention, on the one hand, realizes the opening or closing of the powder gun discharge port for material discharge through the engagement chain structure and engagement lock body, which improves the traditional flipping material discharge method. It eliminates the need to flip the gun rod body, solving the problem of needing to flip the gun rod when discharging powder in conventional roller coating processes. Moreover, it better avoids the possibility of friction and collision between the powder gun and the inner wall of the pipe caused by the flipping of the gun rod. It solves the problem that the inner epoxy roller coating process is not suitable for small-diameter pipes from the source, and extends the roller coating process to small-diameter pipes. On the other hand, by setting fluidized cloth and air inlet to form an air cavity filled with flowing gas, the epoxy powder in the powder gun is always in a fluidized state by filling gas. This not only has a cooling effect, but also solves the problem of powder agglomeration after long-term use. It can optimize the inner wall roller coating effect and improve the uniformity of the anti-corrosion coating.

[0029] 2. The gas flow structure in this application cleans the inside of the powder gun during the gas flow process, leaving almost no powder residue on the inner wall of the gun barrel. This solves the problem of difficult cleaning inside the gun barrel and also eliminates the need to clean the previous color powder inside the gun barrel when changing to a different color powder, thus improving work efficiency.

[0030] 3. The diameter of the gun barrel body of this application decreases in the axial direction, which reduces the drooping height of the end of the powder gun that penetrates into the inner wall of the pipe, further avoiding friction with the inner wall of the pipe, so as to prevent dew points or even damage to the pipe wall.

[0031] 4. The present invention can also adapt to the uneven temperature of steel pipes through the chain structure. By controlling the powder falling sequence from both ends to the middle, the temperature of the steel pipe is relatively consistent when the powder falls at different positions, thereby reducing the color difference of the coating caused by the temperature difference of the steel pipe, improving the color uniformity of the coating, and thus improving the aesthetics and anti-corrosion performance of the internal anti-corrosion coating of the pipe.

[0032] 5. The powder gun structure of the present invention is simple and practical, with high production efficiency. The resulting coating has uniform thickness and a smooth appearance, and good coating adhesion. It can ensure production efficiency and quality while solving the limitations of the spraying process, making the internal epoxy anti-corrosion pipe more advantageous in the production process. Attached Figure Description

[0033] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0034] Figure 1 This is a bottom view of the chain fluidized powder gun structure for internal epoxy roller coating process in one or more embodiments of the present invention.

[0035] Figure 2 for Figure 1Cross-sectional view of the structure shown;

[0036] Figure 3 for Figure 1 Enlarged view of a portion at point A;

[0037] Figure 4 for Figure 1 A magnified view of section B.

[0038] In the diagram: 1. Gun barrel body; 2. Fluidized cloth; 3. Fluidized air inlet; 4. Meshing chain structure; 5. Meshing lock body; 6. Pulley adjustment mechanism; 7. Belt connector; 8. Drive motor; 9. Reciprocating belt; 10. Support handle. Detailed Implementation

[0039] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] In one typical embodiment of this application, a chain-driven fluidized bed powder gun structure for an internal epoxy roller coating process is provided, such as... Figure 1-4 As shown, the gun barrel body 1 is configured with a polygonal bending structure. The bottom of the gun barrel body 1 is provided with a locking chain structure 4 and a locking body 5. The locking chain structure 4 extends along the axial direction of the gun barrel body 1. When the locking body 5 moves linearly, it drives the locking chain structure 4 to open or close.

[0043] A fluidizing cloth 2 is provided on the inner side of the gun barrel body 1, and a gas cavity is formed between the fluidizing cloth 2 and the gun barrel body 1 for gas to flow through. A fluidizing air inlet 3 is provided on the side of the gun barrel body 1 for injecting gas into the gas cavity so that the powder in the gun barrel body is always in a fluidized state.

[0044] like Figure 1 , 2As shown, the gun barrel body 1 is fixedly mounted on the support handle 10, which is located on one side of the gun barrel body 1 for fixing and supporting the gun barrel body. In this embodiment, the gun barrel body 1 uses a decreasing flange design to increase rigidity and reduce overall sag, resulting in a smaller sag after the powder gun structure extends 7.5 meters, thus avoiding friction with the inner wall of the pipe. Specifically, the gun barrel body 1 includes an integrally formed flange, a vertical panel, an inclined plate, and a base plate, such as... Figure 2 As shown, two vertical panels are provided and are respectively vertically arranged on both sides of the base plate. The bottom of the vertical panels is fixedly connected to the base plate by a sloping plate. A folded edge is fixedly arranged on the top of the vertical panels and extends outward. A reinforcing wing is fixedly provided at the bottom of the folded edge. In this embodiment, the gun barrel body is formed by multiple folds of stainless steel, resulting in high overall strength and strong bending resistance. Furthermore, the gun barrel body is divided into three parts connected in sequence: a first section, a middle section, and a tail section. The diameter of the gun barrel body decreases sequentially from the first section to the middle section to the tail section, which can improve the strength of the gun barrel body and reduce overall deformation.

[0045] In this embodiment, a fluidizing cloth 2 is fixedly installed on the inner side of the gun barrel body 1. A sandwich layer exists between the fluidizing cloth 2 and the gun barrel body 1, forming a gas cavity through which gas flows. A fluidizing air inlet 3 is provided on the side of the gun barrel body for injecting gas into the gas cavity, ensuring that the powder inside the gun barrel body remains in a fluidized state. Specifically, as... Figure 1 , 2 As shown, fluidized air inlets 3 are symmetrically arranged on the inclined plates on both sides of the gun barrel body 1. At least two fluidized air inlets 3 are provided. The fluidized air inlets 3 are connected to the internal air chamber. At the same time, the fluidized air inlets are connected to an air compressor to inject compressed air into the air chamber. In this way, a complete fluidization system is formed between the fluidized air inlets, the air chamber and the fluidized cloth. Low-pressure air enters the interlayer between the gun barrel body and the fluidized cloth, i.e., the air chamber, through the fluidized air inlets, so that the powder on the surface of the fluidized cloth is always in a fluidized state. This avoids the situation where the powder clumps after cooling inside the powder gun structure. At the same time, it can also reduce the situation where powder sticks to the surface of the fluidized cloth or powder adheres to the inner wall of the tube and is difficult to clean. It is convenient to clean and replace epoxy powder of different colors.

[0046] The fluidized bed fabric is made of a breathable material with many tiny air pores; in this embodiment, thick cotton fabric is used. For example... Figure 2 As shown, the upper end of the fluidizing cloth 2 is tightly attached to and fixed to the folded edge of the upper end of the gun barrel body 1, and the lower end is fixedly connected to the base plate, forming an air cavity only in the inner space of the vertical panel and the inclined plate. Of course, in other embodiments, depending on actual needs, the fluidizing cloth can also be arranged on the inner side of the base plate for gasification, as long as the position of the discharge port is avoided.

[0047] In this embodiment, to address the numerous technical shortcomings of traditional flipping and unloading methods, the bottom of the gun barrel body 1 is provided with a locking chain structure 4 and a locking body 5. The chain structure 4 extends along the axial direction of the gun barrel body 1, and the locking body 5 opens or closes the chain structure 4 when it moves linearly. Specifically, as shown... Figure 1 As shown, one end of the interlocking chain structure 4 is riveted to the gun barrel body 1, and the other end is flexibly connected to the gun barrel body 1 by adhesive bonding. When powder falls from the open interlocking chain structure, it can cause the flexibly connected end of the interlocking chain structure to hang down, preventing material from accumulating. When the gun barrel body needs to be loaded with powder, the interlocking chain structure and the interlocking lock body combine to lock the interlocking chain structure, which can effectively prevent powder leakage. After the entire gun barrel body is fed into the inner wall of the pipe, the interlocking lock body moves horizontally on the interlocking chain structure, causing the interlocking chain structure to gradually open, and the powder falls from the opening to the inner wall of the pipe, forming an anti-corrosion coating. The initial feeding position of the epoxy powder can be adjusted by changing the position of the interlocking lock body. For example, if the temperature is low at the hot end in the middle of the pipe, the interlocking lock body moves from the outside to the inside, so that the pipe end is coated first and then the pipe body is coated.

[0048] Specifically, the horizontal movement of the engaging lock body is driven by a reciprocating transmission device, such as... Figure 1 , 3 As shown in Figure 4, the reciprocating transmission device includes a drive motor 8, a pulley adjustment mechanism 6, a reciprocating connecting belt 9, and a belt connecting joint 7. The output shaft of the drive motor 8 is connected to the pulley adjustment mechanism 6, and the outer side of the pulley adjustment mechanism 6 is connected to the reciprocating connecting belt 9. Under the drive of the drive motor 8, the reciprocating motion of the reciprocating connecting belt is realized. The reciprocating connecting belt 9 is provided with a belt connecting joint 7, which is fixedly connected to the meshing lock body 5. When the drive motor starts, the forward and reverse rotation of the drive motor can drive the reciprocating connecting belt to reciprocate, thereby driving the meshing lock body to reciprocate in the horizontal direction, thus opening or locking the meshing chain structure. This enables automatic powder feeding to the inner wall of the tube for the roller coating process, achieving the purpose of corrosion prevention and solving the problem of traditional gun barrel flipping.

[0049] Among them, such as Figure 3 , 4 As shown, the pulley adjustment mechanism includes a driving pulley and a driven pulley. The output shaft of the drive motor is coaxially connected to the driving pulley. A reciprocating belt is connected to the outside of the driving and driven pulleys. The drive motor drives the reciprocating belt through the pulley adjustment mechanism. In this embodiment, the drive motor is a servo motor, whose speed can be adjusted to control the moving speed of the engaging lock body, thereby controlling the feeding speed. Both the driving and driven pulleys of the pulley adjustment mechanism are designed with a grooved structure to prevent belt slippage.

[0050] The powder gun structure provided in this embodiment completely solves the problem of traditional gun barrel flipping and the issue of small-diameter pipes easily scraping the inner wall. It extends the roller coating process to corrosion protection for small-diameter pipes, overcoming the shortcomings of spray coating processes such as being environmentally unfriendly, uneven coating, and easy discoloration of intermediate coatings. At the same time, this structure also greatly improves the prevention of powder agglomeration inside the gun barrel and facilitates color change cleaning, solving long-standing limitations.

[0051] In addition, the powder gun structure of this embodiment has a simple and practical process, high production efficiency, uniform coating thickness and smooth appearance, and good coating adhesion. It can ensure both production efficiency and quality, and solve the constraints of the spraying process, making the internal epoxy anti-corrosion pipe more advantageous in the production process.

[0052] Example 2

[0053] In another typical embodiment of the present invention, a working method of a chain fluidized powder gun structure for an internal epoxy roller coating process is provided, based on the chain fluidized powder gun structure for an internal epoxy roller coating process in Embodiment 1, comprising the following steps:

[0054] After the steel pipe is heated, the surface temperature of each section of the steel pipe is measured, the temperature difference between each section is calculated, and the cooling rate of the steel pipe is recorded.

[0055] Based on the temperature difference and cooling rate between the steel pipe sections, calculate the required cooling time for the temperature difference between the middle and both ends of the pipe. Start the drive motor to move the interlocking lock body from the middle to both ends to open the interlocking chain structure for material feeding. Control the speed of the drive motor so that the time interval from feeding from the middle to feeding from both ends is the required cooling time, so as to ensure that the coating temperature in the middle is consistent with the coating temperature at both ends.

[0056] Specifically, in actual production, based on the data feedback from the steel pipe heating process measurement: after the steel pipe is heated, the surface temperature of each section of the steel pipe is first measured, the specific temperature difference is calculated, and the cooling pattern of the steel pipe, i.e. the cooling rate, is recorded; under the same conditions, the cooling pattern per minute is basically consistent.

[0057] The cooling time required to adjust the temperature difference between the middle and ends of the pipe is calculated based on the cooling rate of the pipe under this environment. For example, if the temperature at both ends of the pipe (190℃) is 20℃ higher than the temperature in the middle (170℃), and the temperature drops by 10℃ per minute under the same environment, then it will take 2 minutes to adjust the temperature by 20℃. During production, the material is first fed from the middle of the pipe. The drive motor is started to rotate forward, causing the interlocking lock body to move from the middle to both ends to open the interlocking chain structure for feeding. The speed of the drive motor is controlled so that the time interval from feeding from the middle to feeding from both ends is 2 minutes. During the feeding process, the average moving speed of the interlocking lock body is equivalent to the ratio of half the length of the gun barrel body to the interval time (2 minutes). This can basically ensure that the coating temperature in the middle is consistent with the coating temperature at both ends; that is, the coating temperature in the middle is 170℃, and the coating temperature at both ends is also 170℃, so that the color of the coating inside the pipe is consistent throughout, while improving the performance of the anti-corrosion coating.

[0058] It should be noted that if the steel pipe exhibits other regular changes during coating, the motor speed or direction can be adjusted according to the specific temperature conditions to adjust the feeding time or position, in order to obtain a better coating effect.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Those skilled in the art should understand that the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A working method for a chain fluidized bed powder gun structure used in an internal epoxy roller coating process, characterized in that, A chain-driven fluidized bed powder gun structure for internal epoxy roller coating process is disclosed, comprising a gun barrel body with a polygonal bending structure. The bottom of the gun barrel body is provided with a locking chain structure and a locking body. The chain structure extends along the axis of the gun barrel body, and the locking body opens or closes the chain structure when it moves linearly. A fluidizing cloth is provided inside the gun barrel body, forming a gas cavity between the fluidizing cloth and the gun barrel body for gas flow. A fluidizing air inlet is provided on the side of the gun barrel body for injecting gas into the gas cavity. The working method includes the following steps: After the steel pipe is heated, the surface temperature of each section of the steel pipe is obtained, the temperature difference between each section is calculated, and the cooling rate of the steel pipe is recorded. The required cooling time between the middle and both ends of the steel pipe is calculated based on the temperature difference between the pipe sections and the cooling rate of the steel pipe. Start the drive motor to move the locking body from the middle to both ends to open the interlocking chain structure for material feeding, and control the motor speed so that the time interval from feeding from the middle to feeding from both ends is the required cooling time.

2. The working method of the chain fluidized bed powder gun structure for internal epoxy roller coating process as described in claim 1, characterized in that, The gun barrel body includes an integrally formed folded edge, a vertical panel, an inclined plate, and a base plate. There are two vertical panels, which are respectively vertically arranged on both sides of the base plate. The bottom of the vertical panel is fixedly connected to the base plate through the inclined plate. The folded edge is fixedly arranged on the top of the vertical panel and extends outward. A reinforcing wing is fixedly provided at the bottom of the folded edge.

3. The working method of the chain fluidized powder gun structure for internal epoxy roller coating process as described in claim 2, characterized in that, The fluidizing air inlet is disposed on the inclined plate and extends to the air chamber; at least two fluidizing air inlets are disposed on both sides of the gun barrel body respectively.

4. The working method of the chain fluidized bed powder gun structure for internal epoxy roller coating process as described in claim 1, characterized in that, One end of the meshing chain structure is fixedly connected to the gun barrel body, and the other end is flexibly connected to the gun barrel body.

5. The working method of the chain fluidized bed powder gun structure for internal epoxy roller coating process as described in claim 1, characterized in that, The engaging lock body is driven by a reciprocating transmission device, which includes a drive motor, a pulley adjustment mechanism, a reciprocating connecting belt, and a belt connecting joint. The output shaft of the drive motor is connected to the pulley adjustment mechanism, the pulley adjustment mechanism is connected to the reciprocating connecting belt, and the belt connecting joint is provided on the reciprocating connecting belt. The belt connecting joint is fixedly connected to the engaging lock body.

6. The working method of the chain fluidized powder gun structure for internal epoxy roller coating process as described in claim 2, characterized in that, The fluidizing fabric is disposed on the inner side of the vertical panel and the inclined plate, and the upper end of the fluidizing fabric is fixedly connected to the folded edge.

7. The working method of the chain fluidized powder gun structure for internal epoxy roller coating process as described in claim 6, characterized in that, The fluidized cloth is made of breathable material.

8. The working method of the chain fluidized powder gun structure for internal epoxy roller coating process as described in claim 1, characterized in that, The fluidized air inlet is connected to an external air compressor for supplying compressed air into the air chamber.

9. The working method of the chain fluidized bed powder gun structure for internal epoxy roller coating process as described in claim 1, characterized in that, The gun barrel body is divided into three parts connected in sequence: the first section, the middle section, and the last section. The diameter of the gun barrel body decreases from the first section to the last section.

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