Chain fluidization type powder gun structure for inner epoxy roller coating process and working method of chain fluidization type powder gun structure

Abstract

The invention discloses a chain fluidization type powder gun structure for an inner epoxy roller coating process and a working method of the chain fluidization type powder gun structure, and relates to the technical field of anticorrosive steel pipe coating, the chain fluidization type powder gun structure comprises a gun barrel body of a multilateral bending structure, and the bottom of the gun barrel body is provided with a meshing chain type structure and a meshing lock body which are locked in a matched mode; the meshing chain type structure extends in the axis direction of the gun barrel body, and the meshing lock body drives the meshing chain type structure to be opened or closed when moving linearly. Fluidization cloth is arranged on the inner side of the gun barrel body, an air cavity allowing air to flow through is formed between the fluidization cloth and the gun barrel body, and fluidization air inlet holes are formed in the side face of the gun barrel body; the meshing chain type structure is matched with the meshing lock body to open or close the discharging opening of the powder gun for discharging, and a traditional overturning discharging mode is improved; the fluidization cloth and the air inlet holes are arranged to form the air cavity filled with flowing air, so that epoxy powder in the powder gun is in a fluidization state all the time, the cooling effect is achieved, and the problem that the powder is caked after being used for a long time is solved.

Description

Technical Field

[0001] The invention relates to the technical field of anti-corrosion steel pipe coating, and in particular to a chain fluidized powder gun structure and a working method thereof for an internal epoxy roller coating process. Background Art

[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 anti-corrosion on the inner wall have become the most widely used anti-corrosion type in the industry. This kind of inner epoxy anti-corrosion pipe (especially the conventional anti-corrosion types on the market, such as: inner epoxy and outer PE and inner epoxy and outer 3PE) has good hygiene properties, strong corrosion resistance, long service life and low friction coefficient. It has been fully recognized and widely used in the anti-corrosion pipeline industry.

[0003] There are two conventional processes for inner epoxy anti-corrosion pipes, one is the inner wall spraying process, and the other is the inner wall rolling coating process. Both use steel pipes as the substrate. In the inner wall rolling coating process, the steel pipe is heated to a certain temperature, placed on a turntable and rotated rapidly, and powder guns at both ends enter the inner wall of the pipe at the same time. After reaching the designated position, the powder is turned over or sprayed. The epoxy powder is evenly coated on the inner wall of the steel pipe while rotating rapidly, and finally becomes the finished inner epoxy anti-corrosion pipe after natural cooling. The inner wall of the pipe produced by this process is relatively smooth, with less bleaching powder and less powder nodules. However, in actual production, the inventors found that the inner wall rolling coating process has problems such as heat deformation of the gun barrel, powder agglomeration, uneven heating of the steel pipe, large color difference in the appearance of the coating, and cannot be applied to small-diameter pipes.

[0004] The specific situation is:

[0005] In the roller coating production process, the powder gun flipping and powder dropping is the key; the fixed length of conventional pipes is 12 meters per tube, and the length of the gun rods at both ends must be more than 7.5 meters. They are mostly formed by folding the edges of stainless steel with higher hardness. However, no matter what material the gun rod is made of, the bending resistance is poor if the wall is thin, and it is easy to bend; and although the thickness is increased, the strength is increased, but its own weight is also increased, and the droop is also increased. Therefore, because the powder gun extends a long distance and causes the overall droop height to increase, this roller coating process is prone to friction on the inner wall in small-diameter pipes (diameter below 426mm); in the high-temperature coating process, because the pipe rotates quickly and the powder is in a melted state at high temperature, the coating is easily damaged by the friction of the gun rod, causing leakage points on the inner wall.

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

[0007] Also, because the gun body is made of thin-walled stainless steel material and there is no cooling zone system, the epoxy powder enters the heated steel pipe with the powder gun and easily agglomerates to form powder nodules under the influence of high temperature, and adheres to the inner wall of the powder gun, resulting in uneven powder falling, which in turn affects the uniformity and anti-corrosion performance of the anti-corrosion coating on the inner wall of the pipe.

[0008] Also, since the steel pipe is long, the temperature of the heated steel pipe is uneven in the length direction. Generally, the temperature in the middle is high and the temperature at both ends is low. When the powder guns at both ends penetrate into the inner wall of the pipe and flip the powder guns to drop powder, the temperature difference between different parts can easily lead to differences in coating color, which in turn affects the uneven performance of the coating inside the pipe.

[0009] At present, the disclosed Chinese patent CN 217043269U provides a hollow powder gun structure for producing inner epoxy pipes by roller coating process. By opening a number of holes on the gun barrel, the weight of the gun barrel itself is reduced, the curvature and sagging height of the long gun barrel are reduced, and the gun barrel can be kept suspended in the inner wall of the pipe to a certain extent during the turning process to avoid friction with the pipe wall. However, this structure does not change the way of turning the gun barrel 180 degrees or 360 degrees to turn over and drop the material at one end. It will be seriously deformed after long-term use. Once deformed, it cannot meet the anti-corrosion requirements of small-diameter pipes. In addition, the material is also turned over and poured directly into the inner wall of the steel pipe. The temperature difference of the steel pipe itself is easy to cause inconsistent coating color and performance. In addition, the heat insulation effect of the gun body is poor, and the caking problem is still prominent. Summary of the invention

[0010] In view of one or more deficiencies in the above-mentioned prior art, the present invention provides a chain fluidized powder gun structure and a working method for an internal epoxy roller coating process, which changes the powder discharge method of the powder gun, achieves uniform powder discharge without flipping the powder gun, and can effectively solve the problems of epoxy powder agglomeration and large color difference in coating appearance.

[0011] In order to achieve the above object, the present invention adopts one or more of the following technical solutions:

[0012] In a first aspect, a chain fluidized powder gun structure for an internal epoxy roller coating process is provided, comprising a gun barrel body configured as a multi-sided bending structure, wherein a meshing chain structure and a meshing lock body for locking are provided at the bottom of the gun barrel body, wherein the meshing chain structure extends along the axis direction of the gun barrel body, and the meshing lock body drives the meshing chain structure to open or close when moving linearly;

[0013] A fluidizing cloth is arranged inside the gun barrel body, and an air cavity for gas to flow through is formed between the fluidizing cloth and the gun barrel body. A fluidizing air inlet hole is opened 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 method, the gun barrel body includes an integrally formed folded edge, a vertical panel, an inclined plate and a bottom plate, the vertical panel is provided with two and vertically arranged on both sides of the bottom plate, the bottom of the vertical panel is fixedly connected to the bottom plate through the inclined plate, the folded edge is fixedly arranged on the top of the vertical panel and extends outward; the bottom of the folded edge is fixedly provided with a reinforcing side wing.

[0015] As a further implementation, the fluidization air inlet hole is provided on the inclined plate and extends to the air cavity; at least two fluidization air inlet holes are provided, which are respectively arranged on both sides of the gun barrel body.

[0016] As a further implementation method, one end of the meshing chain structure is fixedly connected to the gun barrel body, and the other end is softly 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 softly connected and adhesively connected to the gun barrel body. When powder falls from the opened meshing chain structure, one end of the soft connection of the meshing chain structure can be driven to hang down to avoid material pocketing.

[0017] As a further implementation method, the meshing lock body is driven by a reciprocating transmission device, and the reciprocating transmission device includes a driving motor, a pulley adjustment mechanism, a reciprocating connecting belt and a belt connecting joint. The output shaft of the driving motor is connected to the pulley adjustment mechanism, and the outer side of the pulley adjustment mechanism is connected to the reciprocating connecting belt. The reciprocating motion of the reciprocating connecting belt is achieved under the drive of the driving motor; the reciprocating connecting belt is provided with the belt connecting joint, and the belt connecting joint is fixedly connected to the meshing lock body; when the driving motor is started, the belt is reciprocated by the forward and reverse rotation of the motor, thereby driving the meshing lock body to achieve reciprocating movement in the horizontal direction, thereby opening or locking the meshing chain structure, and realizing automatic feeding of powder to the inner wall of the tube body for roller coating process, thereby achieving the purpose of anti-corrosion and solving the flipping problem of the traditional gun barrel.

[0018] As a further implementation method, the fluidizing cloth is arranged 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 folding plate to ensure that the powder in the gun barrel body is in a fluidized state to avoid powder agglomeration or adhesion to the inner wall of the pipe, which is difficult to clean.

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

[0020] As a further implementation method, the fluidized air inlet hole is externally connected to an air compressor for providing compressed air to the air cavity, thereby achieving cooling and self-cleaning of the gun barrel body, facilitating color change while solving the problem of powder agglomeration caused by long-term use.

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

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

[0023] A working method of the chain fluidized powder gun structure for internal epoxy roller coating process as described in any one of the above items comprises the following steps:

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

[0025] Calculate the required cooling time between the middle and both ends of the steel pipe based on the temperature difference between the pipe sections and the cooling rate of the steel pipe;

[0026] Start the driving motor to move the meshing lock body from the middle to both ends to open the meshing chain structure for unloading, and control the motor speed so that the time interval from unloading from the middle to unloading at 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 blanking by cooperating with the meshing chain structure and the meshing lock body, thereby improving the traditional flipping blanking method, without flipping the gun barrel body, solving the problem that the gun barrel needs to be flipped when pouring powder in the conventional rolling coating process, and better avoiding the possibility of friction and collision between the powder gun and the inner wall of the pipe caused by the flipping of the gun barrel, solving the problem that the internal epoxy rolling coating process is not suitable for small-diameter pipes from the source, and extending the rolling coating process to small-diameter pipes; on the other hand, an air cavity filled with flowing gas is formed by arranging a fluidizing cloth and an air inlet hole, and the epoxy powder in the powder gun is always in a fluidized state by filling with gas, which not only has a cooling effect, but also solves the problem of powder agglomeration after long-term use, can optimize the inner wall rolling coating effect, and improve the uniformity of the anti-corrosion coating.

[0029] 2. The inflation fluidization structure in the present application cleans the inside of the powder gun during the gas flow process, so that there is almost no powder residue on the inner wall of the gun barrel. On the one hand, it solves the problem that the inside of the gun barrel is difficult to clean. On the other hand, when it is necessary to replace powder of a different color, there is no need to specially clean the powder of the previous color in the gun barrel body, thereby improving work efficiency.

[0030] 3. The diameter of the gun body of the present 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 to prevent dew points or even damage to the pipe wall.

[0031] 4. The present invention can also adapt to the uneven temperature of the steel pipe through the chain structure. By controlling the powder dropping sequence from the two ends to the middle, the temperature of the steel pipe is relatively consistent when the powder drops 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 then improving the aesthetics and anti-corrosion performance of the anti-corrosion coating inside the pipe.

[0032] 5. The powder gun structure and process of the present invention are simple and practical, with high production efficiency. The obtained coating has uniform thickness and smooth appearance. The coating has good adhesion, which can not only ensure production efficiency and quality but also solve the constraints of the spraying process, making the internal epoxy anti-corrosion pipe more advantageous in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0034] Figure 1 It is a schematic diagram of the structure of the chain fluidized powder gun used in the internal epoxy roller coating process in one or more embodiments of the present invention from a bottom view;

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

[0036] Figure 3 for Figure 1 A local enlarged view of point A;

[0037] Figure 4 for Figure 1 A partial enlarged view of point B.

[0038] In the figure: 1. gun barrel body; 2. fluidizing cloth; 3. fluidizing air inlet hole; 4. meshing chain structure; 5. meshing lock body; 6. pulley adjustment mechanism; 7. belt connecting joint; 8. driving motor; 9. reciprocating connecting belt; 10. supporting handle. DETAILED DESCRIPTION

[0039] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] Embodiment 1

[0042] In a typical embodiment of the present application, a chain fluidized powder gun structure for an internal epoxy roller coating process is provided, such as Figure 1-4 As shown, it comprises a gun barrel body 1 which is arranged as a multi-sided bending structure, and a meshing chain structure 4 and a meshing lock body 5 which are matched and locked are arranged at the bottom of the gun barrel body 1, and the meshing chain structure 4 extends along the axis direction of the gun barrel body 1, and the meshing lock body 5 drives the meshing chain structure 4 to open or close when it moves linearly;

[0043] A fluidizing cloth 2 is arranged inside the gun barrel body 1, and an air cavity for gas to flow through is formed between the fluidizing cloth 2 and the gun barrel body 1. A fluidizing air inlet hole 3 is opened on the side of the gun barrel body 1 for injecting gas into the air cavity to keep the powder in the gun barrel body in a fluidized state at all times.

[0044] like Figure 1 , 2As shown, the gun barrel body 1 is fixedly mounted on the support handle 10, and the support handle 10 is arranged 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 adopts a decreasing folding method to increase rigidity and reduce the overall droop, so that the droop of the powder gun structure after extending 7.5 meters is small, avoiding friction with the inner wall of the pipe. Specifically, the gun barrel body 1 includes an integrally formed folding edge, a vertical panel, an inclined panel and a bottom panel, as shown in FIG. Figure 2 As shown, two vertical panels are provided and are respectively arranged vertically on both sides of the bottom plate, the bottom of the vertical panel is fixedly connected to the bottom plate through an inclined plate, the folded edge is fixedly arranged on the top of the vertical panel and extends outward, and the bottom of the folded edge is fixedly provided with a reinforcing side wing. In this embodiment, the gun barrel body is formed by multiple folding of stainless steel, with high overall strength and strong bending resistance. In addition, the gun barrel body is divided into three parts, namely, the first section, the middle section and the tail section, which are connected in sequence. Among them, the diameter of the gun barrel body decreases in sequence 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 inside the gun body 1, and a sandwich is provided between the fluidizing cloth 2 and the gun body 1 to form an air cavity for gas to flow through. A fluidizing air inlet 3 is provided on the side of the gun body to inject gas into the air cavity so that the powder in the gun body is always in a fluidized state. Specifically, Figure 1 , 2 As shown, fluidizing air inlet holes 3 for air intake are respectively provided on the inclined plates on both sides of the gun barrel body 1 and are symmetrically arranged, with at least two being provided, and the fluidizing air inlet holes 3 being connected to the internal air cavity, and at the same time, the fluidizing air inlet holes are externally connected to an air compressor to inject compressed air into the air cavity, so that a complete fluidizing system is formed among the fluidizing air inlet holes, the air cavity and the fluidizing cloth, and low-pressure air enters the interlayer between the gun barrel body and the fluidizing cloth, i.e., the air cavity, through the fluidizing air inlet holes, so that the powder on the surface of the fluidizing cloth is always in a fluidized state, thereby avoiding the agglomeration of the powder after cooling down in the powder gun structure, and at the same time, reducing the situation where the powder sticks to the surface of the fluidizing cloth or the powder adheres to the inner wall of the pipe and is difficult to clean, thereby facilitating the cleaning and replacement of epoxy powders of different colors.

[0046] The fluidized cloth is made of a breathable material with many tiny air holes, and in this embodiment, thick cotton cloth is used. Figure 2 As shown, the upper end of the fluidized cloth 2 is tightly attached to and fixed to the folded plate at the upper end of the gun barrel body 1, and the lower end is fixedly connected to the bottom plate, and an air cavity is formed only in the inner space of the vertical plate and the inclined plate. Of course, in other embodiments, according to actual needs, the fluidized cloth can also be arranged on the inner side of the bottom plate for inflation and fluidization, and it only needs to avoid the position of the feed port.

[0047] In this embodiment, in order to solve the many technical defects of the traditional flipping blanking method, the bottom of the gun barrel body 1 is provided with a meshing chain structure 4 and a meshing lock body 5 for locking together. The meshing chain structure 4 extends along the axis direction of the gun barrel body 1, and the meshing lock body 5 drives the meshing chain structure 4 to open or close when it moves linearly. Specifically, Figure 1 As shown, one end of the meshing chain structure 4 is fixed with the gun barrel body 1 by riveting, and the other end is softly connected with the gun barrel body 1 by bonding. When the powder falls from the opened meshing chain structure, one end of the soft connection of the meshing chain structure can be driven to hang down to avoid bagging. When the gun barrel body needs to be loaded with powder, the meshing chain structure and the meshing lock body are combined to lock the meshing chain structure, which can effectively avoid powder leakage. After the gun barrel body is sent into the inner wall of the pipe as a whole, the meshing lock body moves horizontally on the meshing chain structure to gradually open the meshing chain structure, and the powder falls from the opening to the inner wall of the pipe to form an anti-corrosion coating. Among them, the initial feeding position of the epoxy powder can be adjusted by changing the position of the meshing lock body. If the temperature of the two ends of the middle heat of the pipe is low, the meshing lock body moves from the outside to the inside to achieve coating the pipe end first and then the pipe body.

[0048] Specifically, the horizontal movement of the meshing 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 driving motor 8, a pulley adjustment mechanism 6, a reciprocating connecting belt 9 and a belt connecting joint 7, wherein the output shaft of the driving 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, and the reciprocating motion of the reciprocating connecting belt is realized under the drive of the driving motor 8; a belt connecting joint 7 is provided on the reciprocating connecting belt 9, and the belt connecting joint 7 is fixedly connected to the meshing lock body 5; when the driving motor is started, the reciprocating connecting belt can be driven to reciprocate by the forward and reverse rotation of the driving motor, and then the meshing lock body can be driven to reciprocate in the horizontal direction, thereby opening or locking the meshing chain structure, and the powder can be automatically fed to the inner wall of the tube body for roller coating process, so as to achieve the purpose of corrosion protection and solve the flipping problem of the traditional gun barrel.

[0049] Among them, Figure 3 , 4 As shown, the pulley adjustment mechanism includes a driving wheel and a driven wheel, the output shaft of the driving motor is coaxially connected to the driving wheel, the reciprocating belt is connected to the outside of the driving wheel and the driven wheel, and the driving motor drives the reciprocating belt to move through the pulley adjustment mechanism. In this embodiment, the driving motor adopts a servo motor, which can adjust the speed to control the moving speed of the meshing lock body, and then control the feeding speed. Among them, the driving wheel and the driven wheel of the pulley adjustment mechanism are both set to a groove structure, which can prevent the belt from slipping.

[0050] The powder gun structure provided in this embodiment completely solves the problem of the traditional gun barrel flipping and the problem that small-diameter pipes are easy to scrape the inner wall, and realizes the extension of the roller coating process to small-diameter pipes for corrosion protection, overcoming the defects of the spraying process that is not environmentally friendly, uneven coating, and easy discoloration of the intermediate coating. At the same time, the structure has also made great improvements in preventing powder agglomeration in the gun barrel, color change and cleaning, etc., solving the long-standing constraints.

[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, which can not only ensure production efficiency and production quality, but also solve the constraints of the spraying process, making the internal epoxy anti-corrosion pipe more advantageous in the production process.

[0052] Embodiment 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, and a chain fluidized powder gun structure for an internal epoxy roller coating process based on the first embodiment includes the following steps:

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

[0055] The cooling time required for the temperature difference between the middle and both ends of the pipe is calculated based on the temperature difference between the steel pipe sections and the cooling rate. The drive motor is started to move the meshing lock body from the middle to both ends to open the meshing chain structure for unloading. The motor speed is controlled so that the time interval from unloading in the middle to unloading at both ends is the required cooling time to ensure that the coating temperature in the middle is consistent with the coating temperature at both ends.

[0056] Specifically, in actual production, combined with the data feedback from the steel pipe heating process measurement: after the steel pipe is heated, first measure the surface temperature of each pipe section of the steel pipe, calculate the specific temperature difference, and record the cooling law of the steel pipe, that is, the cooling rate; under the same environment, the cooling law per minute is basically the same.

[0057] The cooling time required for the temperature difference between the middle and both ends of the pipe is calculated by the cooling rate of the pipe in this environment. For example, the temperature at both ends of the pipe (190℃) is 20℃ higher than the middle temperature (170℃). In the same environment, if the temperature drops by 10 degrees Celsius per minute, it will take 2 minutes to cool down by 20℃. During production, start unloading from the middle of the pipe, start the drive motor to rotate forward, move the meshing lock body from the middle to both ends to open the meshing chain structure for unloading, and control the motor speed so that the time interval from unloading from the middle to both ends is 2 minutes. The average moving speed of the meshing lock body during unloading is equivalent to the ratio of half the length of the gun body to the interval time (2 minutes), which can basically achieve the consistency of the coating temperature in the middle and 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 internal coating of the pipe is consistent as a whole, and the performance of the anti-corrosion coating is improved at the same time.

[0058] It should be noted that if there are other regular changes in the steel pipe during coating, the speed or direction of the motor can be adjusted according to the specific temperature conditions to adjust the feeding time or position 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, rather than to limit them. Those skilled in the art should understand that the present invention may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A chain fluidized powder gun structure for internal epoxy roller coating process, characterized in that: It comprises a gun barrel body with a multi-sided bending structure, wherein a meshing chain structure and a meshing lock body for locking are arranged at the bottom of the gun barrel body, wherein the meshing chain structure extends along the axis direction of the gun barrel body, and the meshing lock body drives the meshing chain structure to open or close when moving linearly; A fluidizing cloth is arranged inside the gun barrel body, and an air cavity for gas to flow through is formed between the fluidizing cloth and the gun barrel body. A fluidizing air inlet hole is opened on the side of the gun barrel body for injecting gas into the air cavity.

2. A chain fluidized powder gun structure for internal epoxy roller coating process as claimed in claim 1, characterized in that: The gun barrel body includes an integrally formed folded edge, a vertical panel, an inclined plate and a bottom plate. The vertical panel is provided with two and is vertically arranged on both sides of the bottom plate respectively. The bottom of the vertical panel is fixedly connected to the bottom plate through the inclined plate. The folded edge is fixedly arranged on the top of the vertical panel and extends outward; the bottom of the folded edge is fixedly provided with a reinforcing side wing.

3. A chain fluidized powder gun structure for internal epoxy roller coating process as claimed in claim 2, characterized in that: The fluidization air inlet hole is arranged on the inclined plate and extends to the air cavity; at least two fluidization air inlet holes are arranged respectively on both sides of the gun barrel body.

4. The chain fluidized powder gun structure for internal epoxy roller coating process according to 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 softly connected to the gun barrel body.

5. The chain fluidized powder gun structure for internal epoxy roller coating process according to claim 1, characterized in that: The meshing lock body is driven by a reciprocating transmission device, which includes a driving motor, a pulley adjustment mechanism, a reciprocating connecting belt and a belt connecting joint. The output shaft of the driving motor is connected to the pulley adjustment mechanism, the pulley adjustment mechanism is connected to the reciprocating connecting belt, the reciprocating connecting belt is provided with the belt connecting joint, and the belt connecting joint is fixedly connected to the meshing lock body.

6. A chain fluidized powder gun structure for internal epoxy roller coating process as claimed in claim 2, characterized in that: The fluidizing cloth is arranged on the inner side of the vertical plate and the inclined plate, and the upper end of the fluidizing cloth is fixedly connected to the folding plate.

7. A chain fluidized powder gun structure for internal epoxy roller coating process as claimed in claim 6, characterized in that: The fluidizing cloth is made of breathable material.

8. The chain fluidized powder gun structure for internal epoxy roller coating process as claimed in claim 1, characterized in that: The fluidizing air inlet is externally connected to an air compressor for providing compressed air into the air cavity.

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

10. A working method of a chain fluidized powder gun structure for an internal epoxy roller coating process, based on a chain fluidized powder gun structure for an internal epoxy roller coating process as claimed in any one of claims 1 to 9, comprising the following steps: After the steel pipe is heated, the surface temperature of each pipe section is obtained, and the temperature difference between each pipe section is calculated; the cooling rate of the steel pipe is recorded; Calculate the required cooling time between the middle and both ends of the steel pipe based on the temperature difference between the pipe sections and the cooling rate of the steel pipe; Start the driving motor to move the meshing lock body from the middle to both ends to open the meshing chain structure for unloading, and control the motor speed so that the time interval from unloading from the middle to unloading at both ends is the required cooling time.

Images