Anti-corrosion device and method for anti-overflow powder fluidized tank

Abstract

The present application relates to the technical field of steel pipe anticorrosion, and discloses an anti-overflow fluidized tank anticorrosion device and method, which comprises a fluidized bed and a fluidized plate, the fluidized plate is arranged in the fluidized bed, air bags are arranged at both ends of the fluidized bed, sealing belts are arranged on the upper parts of the air bags, the air bags are connected with pneumatic pressure regulating mechanisms to regulate the air pressure in the air bags, the air bags are inflated to expand or contract, the sealing belts and the end parts of the steel pipes are sealed in surface contact, the air bags expand and contract through the pneumatic pressure regulating mechanisms, and the sealing belts are lifted, the sealing belts are deformed and in profile contact with the steel pipes in the lifting process, there is no gap, the powder in the fluidized tank will not overflow, a series of problems such as plastic powder waste and cleaning are reduced, the frequency of adding plastic powder in the fluidized bed is reduced, and the workload is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel pipe corrosion prevention, in particular to a powder overflow prevention fluidized tank corrosion prevention device and method. BACKGROUND

[0002] One of the most common corrosion prevention methods for corrosion prevention steel pipes is inner epoxy outer PE or inner and outer epoxy corrosion prevention. This corrosion prevention method has been fully recognized and widely used in the corrosion prevention pipe industry due to its good sanitary performance, strong corrosion resistance, and long service life. The current outer PE or outer epoxy corrosion prevention process has some difficulties and defects. The traditional method of this type of corrosion prevention is as follows: taking a steel pipe as a base body, heating the steel pipe to a certain temperature, and then placing it on a rotating table to rotate quickly. During the rotation of the steel pipe, the outer wall is first coated with powder. The conventional process is a horizontal immersion type, that is, the steel pipe is raised during the rotation process, the powder in the fluidized bed is in a suspended state, and the powder rises and coats the surface of the steel pipe. Then the inner wall is coated. After cooling, the desired corrosion prevention pipe product is obtained.

[0003] In the above-mentioned corrosion prevention method, the entire both ends of the pipe are in the form of a drag, and the pipe end part cannot be corrosion prevented. Therefore, the pipe cannot be completely immersed in the fluidized bed, and overflow of powder at both ends of the pipe will occur during production, and the coating thickness at the pipe end is relatively thin. When the overflow of powder at both ends of the pipe is severe, the powder accumulation can easily cause the fluidized bed to rise and not fall normally, directly affecting production, and the falling powder can cause pollution and affect the overall performance. The conventional solution is to install a spring baffle, as shown in Figure 3 However, this method has poor actual operation effect and many problems. First, different diameters of steel pipes require the production of matching steel plates and replacement, which is complex and costly. Second, the baffle is made of hard material and has a lifting function. There is a gap between the baffle and the end of the steel pipe, and powder can easily overflow from this gap, making it impossible to completely block the powder. In addition, due to the size error of the steel pipe, the gap between the baffle and the steel pipe is not uniform. Finally, the overall process relies on visual observation (such as the lifting height of the baffle), and the powder overflow problem cannot be properly solved. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a powder overflow prevention fluidized tank corrosion prevention device and method. The air bag expands and contracts through a pneumatic pressure regulating mechanism, simultaneously driving the sealing belt to rise and fall. The sealing belt deforms and forms a profile contact with the steel pipe during the rising process, and there is no gap. Therefore, the powder in the fluidized tank will not overflow, reducing plastic powder waste, cleaning, and a series of other problems.

[0005] To achieve the above-mentioned purposes, the present application is realized by the following technical solutions:

[0006] The first aspect is a kind of anti-overflow powder fluidized bed anti-corrosion device, including fluidized bed and fluidized plate, the fluidized plate is located in the inside of fluidized bed, and the gas bag is arranged at both ends of the fluidized bed, the upper portion of the gas bag is provided with a sealing band, the gas bag is connected with a pneumatic pressure regulating mechanism to adjust the air pressure in the gas bag, and the inflation of the gas bag is realized to expand or shrink, so that the sealing band and the end position of the steel pipe are sealed by surface contact, and a pressure sensor is arranged in the sealing band.

[0007] As a further implementation, the sealing band is connected to the gas bag by adhesive, and the gas bag is connected to the end of the fluidized bed by adhesive.

[0008] As a further implementation, the sealing band is a soft polyurethane sealing band.

[0009] As a further implementation, the pneumatic pressure regulating mechanism includes a gas inlet pipeline connected to one end of the gas bag, and the other end of the gas inlet pipeline is connected to an air compressor.

[0010] As a further implementation, a pressure gauge is arranged on the gas inlet pipeline to indicate the pressure of the gas bag.

[0011] As a further implementation, the gas bag is arranged at both ends corresponding to the two ends of the sealing band.

[0012] As a further implementation, the fluidized plate includes a main fluidized plate and an inclined fluidized plate, the inclined fluidized plate is arranged at the end of the main fluidized plate and the angle of the inclined fluidized plate relative to the main fluidized plate is adjustable, so as to adjust the wind direction.

[0013] As a further implementation, the inclined fluidized plate is connected to the fluidized plate by a rotating shaft, and the rotating shaft is a damping rotating shaft.

[0014] As a further implementation, a control unit is further included, which realizes the inflation or deflation of the gas bag by controlling the pneumatic pressure regulating mechanism.

[0015] The second aspect is an anti-overflow powder fluidized bed anti-corrosion method, characterized in that the anti-overflow powder fluidized bed anti-corrosion device as described above is used, and the method includes the following steps:

[0016] The steel pipe is placed on the roller, the angle of the inclined fluidized plate is adjusted to an inclined state, the fluidized bed is lifted by the control unit, the air pressure in the gas bag is adjusted by the pneumatic pressure regulating mechanism, and the height of the fluidized bed is adjusted to an appropriate height under the premise that the compression amount of the sealing band and the air pressure in the gas bag are within a safe range according to the pressure detected by the pressure sensor in the sealing band and the indication of the safety air pressure of the gas bag.

[0017] The beneficial effects of the above-mentioned application are as follows:

[0018] 1. The airbag of the present invention expands and contracts through a pneumatic pressure regulating mechanism, which simultaneously drives the sealing strip to rise and fall. When the sealing strip rises, it easily deforms and makes conformal contact with the steel pipe, eliminating gaps. As a result, the powder in the fluidized bed will not overflow, reducing a series of problems such as powder waste and cleaning. It also reduces the frequency of adding powder to the fluidized bed, thus reducing the workload.

[0019] 2. The inclined angle of the fluidized bed at the end of the fluidized bed is adjustable, thereby adjusting the airflow direction and adjusting the powder suspension state at both ends of the fluidized bed; the air pressure inside the airbag is adjusted by the control unit, thereby achieving complete contact and sealing between the airbag and the sealing strip and the steel pipe, solving the problem of powder overflow at the end of the existing steel pipe.

[0020] 3. The control unit can adjust the fluidized bed to a suitable height, adjust the airbag pressure to a suitable pressure range, and adjust the sealing strip to a suitable compression amount based on the pressure inside the airbag and the pressure detected by the pressure sensor. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a front view of the anti-overflow fluidized bed corrosion protection device in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the fluidizing plate structure of the anti-overflow fluidizing tank corrosion protection device in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a fluidized bed with an arc-shaped baffle in the prior art.

[0025] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0026] Among them: 1. Fluidized plate; 2. Fluidized bed; 3. Airbag; 4. Sealing strip; 41. Pressure sensor; 5. Steel pipe; 6. Pneumatic pressure regulating mechanism; 7. Pressure gauge; 8. Rotating shaft; 9. Inclined fluidized plate; 21. Suspended powder; 22. Arc-shaped baffle. Detailed Implementation

[0027] 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.

[0028] Existing technologies such as Figure 3As shown, a roller is provided at the outer side of the fluidized bed end, and arc-shaped baffles 22 are installed at both ends of the fluidized bed. The roller drives the steel pipe 5 to rotate at the end of the fluidized bed. The suspended powder 21 is located inside the fluidized bed 2 near the lower part of the end of the steel pipe 5 through the arc-shaped baffles 22. After the suspension function is turned on, the roller drives the steel pipe 5 to rotate, and the suspended powder 21 can adhere to the surface of the steel pipe.

[0029] In the above solution, an arc-shaped baffle 22 is used to prevent powder overflow. However, since the baffle is made of a rigid material, different sizes of arc-shaped baffles 22 need to be configured for steel pipes of different diameters, requiring frequent disassembly and complex operation. Furthermore, the steel pipe dimensions have errors and are not necessarily perfectly round, making it even more difficult to control the gap between the arc-shaped baffle 22 and the steel pipe 5, increasing the risk of powder overflow. Secondly, the lifting height of the fluidized bed is determined by visual observation, making the gap between the baffle and the steel pipe even more uncontrollable, and powder can easily overflow continuously from this gap, failing to properly solve the powder overflow problem.

[0030] Example 1

[0031] In a typical embodiment of the present invention, reference is made to Figures 1-2 As shown, an anti-overflow fluidized bed corrosion protection device includes a fluidized plate 1, a fluidized bed 2, an air bag 3, a sealing strip 4, a steel pipe 5, a pneumatic pressure regulating mechanism 6, a pressure gauge 7, a rotating shaft 8, and an inclined fluidized plate 9.

[0032] Fluidizing plate 1 is located inside fluidized bed 2, which contains anti-corrosion powder. During production, after the suspension function is activated, the powder is in a fluidized state, becoming suspended powder 21. Fluidized bed 2 has a hydraulic height adjustment function, which can realize hydraulic lifting and lowering to adjust the height of fluidized bed 2. This part is existing technology.

[0033] like Figure 1 As shown, the fluidized bed 2 has an arc shape at both ends, where an airbag 3 is provided. The airbag 3 is connected to a pneumatic pressure regulating mechanism to adjust the internal air pressure of the airbag 3. By inflating the airbag 3, a seal is achieved between the airbag 3 and the end of the steel pipe.

[0034] Furthermore, a sealing strip 4 is fixed to the upper surface of the airbag 3, wherein the sealing strip 4 is glued to the airbag 3, and the airbag 3 is glued to the end of the fluidized bed. The airbag 3, the sealing strip 4 and the fluidized bed 1 are glued together as a whole. By inflating the airbag 3 with air, it expands and contacts the end of the steel pipe through the sealing strip 4, eliminating gaps and achieving a full seal, effectively preventing powder from overflowing from the end of the fluidized bed.

[0035] The airbag 3 adjusts the intake and exhaust of gas through the pneumatic pressure regulating mechanism 6. The airbag 3 expands and contracts as it adjusts the intake and exhaust of gas, which in turn drives the sealing strip 4 to rise and fall. The sealing strip 4 is a soft polyurethane sealing strip, which is a soft and wear-resistant material. During the rising process, it easily deforms and makes conformal contact with the steel pipe without gaps. As a result, the powder in the fluidized bed will not overflow, reducing the waste of plastic powder and a series of cleaning problems. It also reduces the frequency of adding plastic powder to the fluidized bed and reduces the workload.

[0036] A pressure sensor 41 is installed inside the sealing strip 4. The pressure inside the airbag 3 can be adjusted according to the value detected by the pressure sensor 41, and the fluidized bed height can be adjusted accordingly. The pressure sensor 41 is located in the middle of the sealing strip.

[0037] In this embodiment, the two ends of the airbag 3 are correspondingly arranged with the two ends of the sealing strip 4, so that the sealing strip 4 has a certain length and can make good contact with the steel pipe 5.

[0038] The soft polyurethane sealing tape has wear-resistant properties. The airbag 3 expands and compresses the sealing tape 4 together with the steel pipe 5, so that the gap between the sealing tape 4 and the steel pipe is completely sealed, solving the problem of powder overflow. At the same time, it can also solve the problem of inconsistent gap size between the baffle and the steel pipe caused by the dimensional error of the steel pipe 5.

[0039] Furthermore, this embodiment utilizes an airbag 3 to drive the sealing strip into contact with the steel pipe. The airbag 3 and sealing strip 4 have a shaping effect, enabling sealing contact with pipes of different diameters. Suitable for all models, it eliminates the need for replacement during model changes, thus solving the problem of replacing the sealing plate in traditional methods. This fundamentally and completely resolves the shortcomings of the fluidized bed process.

[0040] The pneumatic pressure regulating mechanism 6 includes an air inlet pipe connected to the airbag 3 at one end and an air compressor at the other end. A pressure gauge is provided on the air inlet pipe to indicate the airbag pressure. A control unit is configured on the fluidized bed 2. The control unit can obtain the pressure index of the pressure gauge and can also control the valve of the pneumatic pressure regulating mechanism to realize the air inlet and outlet of the airbag.

[0041] like Figure 2As shown, the fluidizing plate 1 includes a main fluidizing plate and an inclined fluidizing plate 9. The inclined fluidizing plate 9 is located at the end of the main fluidizing plate and its angle relative to the main fluidizing plate is adjustable. By setting the end of the fluidizing plate 1 as the inclined fluidizing plate 9, and the inclined fluidizing plate 9 being movably connected to the main fluidizing plate via a rotating shaft 8, the inclined fluidizing plate 9 can rotate relative to the fluidizing plate 1 to adjust its angle, thereby adjusting the airflow direction and adjusting the powder suspension state at both ends of the fluidized bed. This ensures that the powder suspension at both ends meets the corrosion protection requirements, avoids a thin coating caused by no suspended powder at both ends, and also reduces powder overflow to both ends. In this embodiment, the rotating shaft 8 is a damping rotating shaft, which allows manual adjustment of the relative angle between the inclined fluidizing plate 9 and the main fluidizing plate. The damping rotating shaft is existing technology.

[0042] The preferred angle between the inclined fluidizing plate 9 and the mainstream fluidizing plate is 45°.

[0043] The anti-overflow fluidized bed corrosion protection device in this embodiment solves the problem of replacing baffles in the existing mode, and fundamentally solves the defects of the fluidized bed process.

[0044] In this embodiment, the pneumatic pressure regulating mechanism 6 can automatically adjust the air pressure inside the airbag through the control unit.

[0045] For example: If the compression amount of the soft polyurethane sealing tape 4 is P, the normal thickness of the sealing tape 4 is d1, and the thickness after compression is d2, then the compression amount of the sealing tape 4 is P = d1 - d2.

[0046] The optimal compression range for sealing strip 4 is (PA, PB). Therefore, it is necessary to ensure that PA < P < PB. This is the state in which sealing strip 4 can work normally, simultaneously ensuring the sealing performance of the sealing strip to the gap and its own wear resistance. If the compression P > PB, although the sealing effect is better, the sealing strip will wear out faster. If the compression P < PA, the sealing strip will wear out much faster, but the sealing effect will be poorer.

[0047] Correspondingly, the optimal compression range of the sealing strip 4 corresponds to the pressure range detected by the pressure sensor 41 (NA, NB). It is necessary to ensure that NA < N < NB, which is the state in which the sealing strip 4 can work normally.

[0048] Assuming the maximum allowable pressure for normal operation of airbag 3 is P1, and the maximum lifting height is H; and the lifting height of the fluidized bed is H2, then the operating mode of this control system is as follows:

[0049] 1) When the airbag starts to inflate, the actual pressure of the airbag is P2, the lifting height is H1, and the pressure sensor inside the sealing strip detects that the pressure N changes as inflation begins, until NA < N < NB and P2 < P1; then inflation stops.

[0050] 2) When the airbag is inflated, N < NA and P2 = P1; then the lifting height H2 of the fluidized bed needs to be increased until equation 1) is satisfied.

[0051] 3) When the airbag is inflated, N > NB and P2 > P1; then the lifting height H2 of the fluidized bed needs to be reduced until equation 1 above is satisfied.

[0052] The control unit in this embodiment can acquire pressure gauge data in real time to obtain the pressure inside the airbag. By comparing the actual pressure inside the airbag with the maximum allowable pressure P1 for normal operation of the airbag 3, and by detecting the pressure on the sealing strip through the pressure sensor, the control unit adjusts the fluidized bed height, airbag pressure, and sealing strip compression within a reasonable range based on the airbag pressure and the pressure detected by the pressure sensor.

[0053] This device not only prevents powder overflow structurally, but also enables automated control of process parameters, fundamentally solving the problems of powder overflow and port coating, and fully leveraging the advantages of fluidized bed technology.

[0054] Example 2

[0055] A method for preventing corrosion of a fluidized bed with powder overflow, using the anti-powder overflow fluidized bed corrosion prevention device described in Example 1, includes the following steps:

[0056] The steel pipe is placed on the rollers, and the angle of the inclined fluidized plate is adjusted to a tilted state of 45°. The fluidized bed is raised through the control unit, and the air pressure inside the airbag is adjusted through the pneumatic pressure regulating mechanism. Based on the pressure detected by the pressure sensor inside the sealing strip and the indication of the airbag's safety air pressure, the height of the fluidized bed is adjusted to a suitable height while ensuring that the compression of the sealing strip and the air pressure inside the airbag are within a safe range.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A corrosion protection device for a fluidized bed to prevent powder overflow, characterized in that, It includes a fluidized bed and a fluidized plate. The fluidized plate is located inside the fluidized bed. Airbags are provided at both ends of the fluidized bed. A sealing strip is provided on the upper part of the airbag. The airbag is connected to a pneumatic pressure regulating mechanism to regulate the air pressure inside the airbag. Inflating the airbag causes it to expand or contract, so that the sealing strip and the end of the steel pipe are sealed through surface contact. A pressure sensor is provided inside the sealing strip. The sealing strip is glued to the airbag, the airbag is glued to the end of the fluidized bed, and the airbag, sealing strip and fluidized bed are glued together as a whole. By inflating the airbag with air, it expands and contacts the end of the steel pipe through the sealing strip, eliminating gaps and achieving a full seal. The sealing strip is a soft polyurethane sealing strip; The fluidizing plate includes a main fluidizing plate and an inclined fluidizing plate. The inclined fluidizing plate is located at the end of the main fluidizing plate and its angle relative to the main fluidizing plate is adjustable, thereby adjusting the airflow direction and adjusting the powder suspension state at both ends of the fluidized bed. This ensures that the powder suspension at both ends meets the anti-corrosion requirements, avoids a thin coating caused by no suspended powder at both ends, and also reduces powder overflow to both ends.

2. The anti-overflow fluidized bed corrosion protection device according to claim 1, characterized in that, The pneumatic pressure regulating mechanism includes an air intake pipe connected to an airbag at one end and an air compressor at the other end.

3. The anti-overflow fluidized bed corrosion protection device according to claim 2, characterized in that, A pressure gauge is installed on the air intake pipe to indicate the airbag pressure.

4. The anti-overflow fluidized bed corrosion protection device according to claim 1, characterized in that, The two ends of the airbag are correspondingly set to the two ends of the sealing strip.

5. The anti-overflow fluidized bed corrosion protection device according to claim 1, characterized in that, The inclined fluidizing plate is connected to the fluidizing plate via a rotating shaft, which is a damping rotating shaft.

6. The anti-overflow fluidized bed corrosion protection device according to claim 5, characterized in that, It also includes a control unit, which controls the pneumatic pressure regulating mechanism to inflate or deflate the airbag.

7. A method for preventing corrosion in a fluidized bed with powder overflow prevention, characterized in that, The anti-overflow fluidized bed corrosion protection device according to claims 1-6 includes the following steps: The steel pipe is placed on the rollers, the angle of the inclined fluidized plate is adjusted to the inclined state, the fluidized bed is raised through the control unit, the air pressure in the airbag is adjusted through the pneumatic pressure regulating mechanism, and the height of the fluidized bed is adjusted to a suitable height based on the compression of the sealing tape and the indication of the safe air pressure in the airbag, while ensuring that the compression of the sealing tape and the air pressure in the airbag are within the safe range.

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