Anti-overflow powder fluidizing tank corrosion prevention device and method

Abstract

The invention relates to the technical field of steel pipe corrosion prevention, and discloses an anti-overflow powder fluidization tank corrosion prevention device and method.The anti-overflow powder fluidization tank corrosion prevention device comprises a fluidized bed and a fluidization plate, the fluidization plate is arranged in the fluidized bed, air bags are arranged at the two ends of the fluidized bed, sealing belts are arranged on the upper portions of the air bags, and the air bags are connected with a pneumatic pressure adjusting mechanism to adjust air pressure in the air bags; the air bag is inflated to expand or contract, so that the sealing tape and the end part of the steel pipe are sealed in a surface contact manner; the air bag expands and contracts through the pneumatic pressure regulating mechanism and drives the sealing belt to ascend and descend at the same time, the sealing belt makes contact with the steel pipe in the ascending process, deformation is easily achieved, profiling contact with the steel pipe is achieved, no gap exists, powder in the fluidization groove cannot overflow, and a series of problems such as plastic powder waste and cleaning are solved. And meanwhile, the fluidized bed molding powder adding frequency is reduced, and the workload is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe anti-corrosion, and in particular to an anti-overflow powder fluidized bed anti-corrosion device and method. Background Art

[0002] At present, one of the most common anti-corrosion methods for anti-corrosion steel pipes is internal epoxy and external PE or internal and external epoxy anti-corrosion; this anti-corrosion method has been fully recognized and widely used in the anti-corrosion pipeline industry due to its good sanitary performance, strong corrosion resistance, and long service life. There are relatively large difficulties and defects in the current external PE or external epoxy anti-corrosion process. The traditional method of this type of anti-corrosion is: taking the steel pipe as the base body, after heating the steel pipe to a certain temperature, placing it on a turntable and rotating it quickly. During the rotation of the steel pipe, the outer wall powder coating is first carried out. The conventional process is horizontal dipping, that is: when the steel pipe rotates, the fluidized bed is raised, and the powder in the fluidized bed is in a suspended state, and the powder rises and is coated on the surface of the steel pipe; then the inner wall coating is carried out; finally, it becomes the required anti-corrosion pipe finished product after cooling.

[0003] In the above anti-corrosion method, since the entire two ends of the pipe are in the form of idler wheels, the pipe ends cannot be anti-corroded. Therefore, the pipe cannot be completely immersed in the fluidized bed, which will cause powder overflow at both ends of the fluidized bed during the production process, and the coating thickness at the pipe ends is relatively thin. When the powder overflows seriously at both ends of the pipe, the powder accumulation is likely to cause the fluidized bed to fail to fall normally after rising, directly affecting the production; and the powder falling causes pollution and affects the overall performance. The conventional solution is to install a spring baffle, as Figure 3 shown, but the actual operation effect of this method is poor and there are many problems. First, for steel pipes of different diameters, matching steel plates need to be manufactured and replaced, which is complicated in operation and high in cost; second, the baffle is made of hard material and has a lifting function, and there is a gap between the baffle and the pipe end, and the powder is likely to overflow from this gap, and the powder cannot be completely blocked. Moreover, due to the dimensional errors of the steel pipe and its non-uniform round structure, the gap between the baffle and the steel pipe is not the same everywhere; finally, the overall process depends entirely on visual observation with the naked eye (such as the lifting height of the baffle), and the powder overflow problem has never been properly solved. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an anti-overflow powder fluidized bed anti-corrosion device and method. The airbag expands and contracts through a pneumatic pressure regulating mechanism, and at the same time drives the sealing belt to lift. When the sealing belt contacts the steel pipe during the rising process, it is easy to deform and achieve a conforming contact with the steel pipe, and there is no gap, so the powder in the fluidized bed will not overflow, reducing a series of problems such as plastic powder waste and cleaning.

[0005] In order to achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] In a first aspect, an anti-overflow powder fluidized bed anti-corrosion device includes a fluidized bed and a fluidizing plate. The fluidizing plate is disposed inside the fluidized bed. Air bags are provided at both ends of the fluidized bed. A sealing belt is provided above the air bags. The air bags are connected to a pneumatic pressure regulating mechanism to adjust the air pressure inside the air bags. Inflating the air bags causes the air bags to expand or contract, so that the sealing belt and the end of the steel pipe are sealed in a surface contact form. A pressure sensor is provided inside the sealing belt.

[0007] As a further implementation manner, the sealing belt is adhesively connected to the air bag, and the air bag is adhesively connected to the end of the fluidized bed.

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

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

[0010] As a further implementation manner, a pressure gauge is provided on the air inlet pipeline for indicating the air pressure of the air bag.

[0011] As a further implementation manner, both ends of the air bag are correspondingly arranged with both ends of the sealing belt.

[0012] As a further implementation manner, the fluidizing plate includes a main fluidizing plate and an inclined fluidizing plate. The inclined fluidizing plate is disposed at the end of the main fluidizing plate and is adjustable in angle relative to the main fluidizing plate, thereby adjusting the wind direction.

[0013] As a further implementation manner, the inclined fluidizing plate is connected to the fluidizing plate through a rotating shaft, and the rotating shaft is a damping rotating shaft.

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

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

[0016] The steel pipe is placed on the roller. The angle of the inclined fluidizing plate is adjusted to an inclined state. The fluidized bed is raised through the control unit. The air pressure inside the air bag is adjusted through the pneumatic pressure regulating mechanism. According to the pressure detected by the pressure sensor inside the sealing belt and the indication of the safe air pressure of the air bag, the height of the fluidized bed is adjusted to a suitable height on the premise of ensuring that the compression amount of the sealing belt and the air pressure inside the air bag are within the safe range.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The airbag of the present invention expands and contracts through a pneumatic pressure regulating mechanism, while driving the lifting of the sealing belt. When the sealing belt contacts the steel pipe during the ascending process, it is easy to deform and achieve conformal contact with the steel pipe, without gaps. Then, the powder in the fluidization tank will not overflow, reducing a series of problems such as plastic powder waste and cleaning; at the same time, it also reduces the frequency of adding plastic powder to the fluidized bed and reduces the workload.

[0019] 2. The inclination angle of the inclined fluidization plate at the end of the fluidization plate is adjustable, so that the wind direction can be adjusted to achieve the adjustment of the powder suspension state at both ends of the fluidized bed; the internal air pressure of the airbag is adjusted through the control unit, so as to achieve the complete contact and sealing of the airbag driving the sealing belt and the steel pipe, and solve the problem of powder overflow at the existing position of the steel pipe end.

[0020] 3. The control unit can adjust the height of the fluidized bed to a suitable level, adjust the airbag pressure within a suitable pressure range, and adjust the appropriate compression amount of the sealing belt according to the detected internal pressure of the airbag and the pressure detected by the pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0022] Figure 1 is the front view of the anti-overflow powder fluidization tank anti-corrosion device in the embodiment of the present invention;

[0023] Figure 2 is the schematic structural diagram of the fluidization plate of the anti-overflow powder fluidization tank anti-corrosion device in the embodiment of the present invention;

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

[0025] In the figure: The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0026] Wherein: 1, fluidization plate; 2, fluidized bed; 3, airbag; 4, sealing belt; 41, pressure sensor; 5, steel pipe; 6, pneumatic pressure regulating mechanism; 7, pressure gauge; 8, rotating shaft; 9, inclined fluidization plate; 21, suspended powder; 22, arc-shaped baffle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] It should be noted that the following detailed description is illustrative and is 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 meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0028] The prior art is as Figure 3As shown in the figure, rollers are provided at the outer side of the end of the fluidized bed. Arc-shaped baffles 22 are installed at both ends of the fluidized bed. The end of the fluidized bed drives the steel pipe 5 to rotate through the rollers, and is close to the position below the end of the steel pipe 5 through the arc-shaped baffle 22. The suspended powder 21 is located inside the fluidized bed 2. After the suspension function is turned on, the rollers drive 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, the arc-shaped baffle 22 is used to block the powder from overflowing. However, since the baffle is made of a hard material, for steel pipes of different diameters, arc-shaped baffles 22 of different sizes need to be configured, which requires frequent disassembly and complex operation. Moreover, there are errors in the size of the steel pipe and it is not necessarily a perfect circle, making it even more impossible to limit 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 observed by the naked eye, making the gap between the baffle and the steel pipe even more uncontrollable, and the powder is likely to continuously overflow from this gap, and the problem of powder overflow cannot be properly solved.

[0030] Embodiment 1

[0031] In a typical implementation manner of the present invention, refer to Figures 1 - 2 As shown in the figure, an anti-overflow powder fluidized tank anti-corrosion device includes a fluidization plate 1, a fluidized bed 2, an airbag 3, a sealing belt 4, a steel pipe 5, a pneumatic pressure regulating mechanism 6, a pressure gauge 7, a rotating shaft 8, and an inclined fluidization plate 9.

[0032] The fluidization plate 1 is arranged inside the fluidized bed 2. The inside of the fluidized bed 2 is anti-corrosion powder. When the suspension function is turned on during production, the powder is in a fluidized state and is the suspended powder 21. The fluidized bed 2 has a hydraulic height adjustment function and can realize hydraulic lifting to adjust the height of the fluidized bed 2. This part is the prior art.

[0033] As Figure 1 shown in the figure, the shapes of both ends of the fluidized bed 2 are arc-shaped, and airbags 3 are provided here. The airbags 3 are connected to a pneumatic pressure regulating mechanism to adjust the air pressure inside the airbags 3, and the airbags 3 are inflated to achieve sealing between the airbags 3 and the ends of the steel pipes.

[0034] Furthermore, a sealing belt 4 is fixed on the upper surface of the airbag 3. The sealing belt 4 is adhesively connected to the airbag 3, and the airbag 3 is adhesively connected to the end of the fluidized bed. The airbag 3, the sealing belt 4, and the fluidized bed 1 are adhesively connected as an integral body. By inflating the airbag 3 to make it expand and contacting the end of the steel pipe through the sealing belt 4, the gap is eliminated to achieve full sealing, effectively preventing the powder from overflowing from the end of the fluidized bed.

[0035] The airbag 3 adjusts the inflow and outflow of gas through the pneumatic pressure regulating mechanism 6. The overall adjustment of the inflow and outflow of gas in the airbag 3 will cause it to expand and contract, and at the same time drive the lifting of the sealing belt 4. The sealing belt 4 is a soft polyurethane sealing belt, and the soft polyurethane sealing belt is a soft wear-resistant material. When it contacts the steel pipe during the rising process, it is easy to deform and achieve conforming contact with the steel pipe, without gaps. Then the powder in the fluidized bed will not overflow, reducing a series of problems such as plastic powder waste and cleaning; at the same time, it also reduces the frequency of adding plastic powder to the fluidized bed and reduces the workload.

[0036] A pressure sensor 41 is arranged inside the sealing belt 4. According to the indication of the detected value of the pressure sensor 41, the internal pressure of the airbag 3 can be adjusted, and the height of the fluidized bed can be adjusted correspondingly. The pressure sensor 41 is arranged at the middle position of the sealing belt.

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

[0038] The soft polyurethane sealing belt has the characteristic of wear resistance. When the airbag 3 expands, it compresses the sealing belt 4 together with the steel pipe 5, so that the gap between the sealing belt 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 sizes between the baffle and the steel pipe caused by the dimensional error of the steel pipe 5.

[0039] In addition, in this embodiment, the airbag 3 is used to drive the sealing belt to contact the steel pipe. The airbag 3 and the sealing belt 4 have a shaping effect and can achieve sealed contact according to different calibers of pipe materials, suitable for all models, without the need to be replaced due to model switching, solving the problem of replacing the sealing plate in the traditional mode. Fundamentally, it completely solves the defect problem of the fluidized bed process.

[0040] The pneumatic pressure regulating mechanism 6 includes an air inlet pipeline with one end connected to the airbag 3. The other end of the air inlet pipeline is connected to an air compressor. A pressure gauge is arranged on the air inlet pipeline 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 the control unit can also control the valve of the pneumatic pressure regulating mechanism to realize the air intake and air outlet of the airbag.

[0041] Such as Figure 2As shown, the fluidization plate 1 includes a main fluidization plate and an inclined fluidization plate 9. The inclined fluidization plate 9 is provided at the end of the main fluidization plate and is adjustable in angle relative to the main fluidization plate. By setting the end of the fluidization plate 1 as the inclined fluidization plate 9, the inclined fluidization plate 9 is movably connected to the main fluidization plate through a rotating shaft 8. The inclined fluidization plate 9 can rotate relative to the fluidization plate 1 to adjust the angle, thereby adjusting the wind direction, realizing the adjustment of the powder suspension state at both ends of the fluidized bed, ensuring that the powder suspension at both ends meets the anti-corrosion requirements, avoiding the thin coating caused by the lack of suspended powder at both ends, and reducing the powder overflow to both ends. The rotating shaft 8 in this embodiment is a damping rotating shaft, and the relative angle between the inclined fluidization plate 9 and the main fluidization plate can be manually adjusted. The damping rotating shaft is a prior art.

[0042] The included angle between the inclined fluidization plate 9 and the main fluidization plate is preferably 45°.

[0043] The anti-overflow powder fluidization tank anti-corrosion device in this embodiment solves the problem of replacing the baffle in the existing mode and fundamentally solves the defect problem of the fluidization tank process.

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

[0045] For example: 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 P of the sealing tape 4 = d1 - d2.

[0046] The optimal compression amount range of the sealing tape 4 is (PA, PB). Therefore, it is necessary to ensure that PA < P < PB. At this time, it is the state in which the sealing tape 4 can work normally. This state can take into account both the sealing performance of the sealing tape for the gap and its own wear resistance. If the compression amount P > PB, although the sealing effect is better, the speed at which the sealing tape is worn out is accelerated. If the compression amount P < PA, the speed at which the sealing tape is worn out is greatly reduced, but the sealing effect is poor.

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

[0048] Let the maximum allowable bearing pressure of the airbag 3 during normal operation be P1, and the maximum lifting height be H; the lifting height of the fluidized bed is H2. Then the operation mode of this control system is as follows:

[0049] 1) When the airbag starts to be inflated, the actual pressure of the airbag is P2, the lifting height is H1, and the pressure N detected by the pressure sensor in the sealing tape changes as the inflation starts until NA < N < NB and P2 < P1; stop inflating.

[0050] 2) When the airbag is inflated, N < NA and P2 = P1; then it is necessary to increase the lifting height H2 of the fluidized bed until the above formula (1) is satisfied;

[0051] 3) When the airbag is inflated, N > NB and P2 > P1; then it is necessary to decrease the lifting height H2 of the fluidized bed; until the above formula (1) is satisfied.

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

[0053] This device can not only prevent powder overflow in terms of structure, but also realize the automatic control of process parameters, fundamentally solve the problems of powder overflow and port coating, and give full play to the advantages of the fluidized tank process.

[0054] Embodiment 2

[0055] An anti-powder-overflow and anti-corrosion method for a fluidized tank uses the anti-powder-overflow and anti-corrosion device described in Embodiment 1, and includes the following steps:

[0056] The steel pipe is placed on the roller, the angle of the inclined surface fluidized plate is adjusted to an inclined state, the inclination angle is 45°, the fluidized bed is lifted by the control unit, the air pressure in the airbag is adjusted by the pneumatic pressure regulating mechanism, and according to the pressure detected by the pressure sensor inside the sealing belt and the indication of the airbag safety air pressure, on the premise of ensuring that the sealing belt compression amount and the air pressure in the airbag are within the safe range, the fluidized bed height is adjusted to an appropriate height.

[0057] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An anti-overflow powder fluidization tank anti-corrosion device, characterized in that It includes a fluidized bed and a fluidizing plate. The fluidizing plate is arranged inside the fluidized bed. Air bags are provided at both ends of the fluidized bed. A sealing belt is provided above the air bags. The air bags are connected to a pneumatic pressure regulating mechanism to adjust the air pressure inside the air bags. Inflating the air bags can cause them to expand or contract, so that the sealing belt and the end of the steel pipe are sealed in a surface contact form. A pressure sensor is provided inside the sealing belt.

2. The anti-overflow powder fluidization tank anti-corrosion device according to claim 1, characterized in that, The sealing belt is adhesively connected to the air bag, and the air bag is adhesively connected to the end of the fluidized bed.

3. The anti-spill powder fluidization tank anti-corrosion device according to claim 2, characterized in that, The sealing belt is a soft polyurethane sealing belt.

4. The anti-overflow powder fluidization tank anti-corrosion device according to claim 1, wherein, The pneumatic pressure regulating mechanism includes an air inlet pipeline with one end connected to the air bag, and the other end of the air inlet pipeline is connected to an air compressor.

5. The anti-overflow powder fluidization tank anti-corrosion device according to claim 4, characterized in that, A pressure gauge is provided on the air inlet pipeline to indicate the air pressure of the air bag.

6. The anti-overflow powder fluidized tank anti-corrosion device according to claim 1, characterized in that, Both ends of the air bag and both ends of the sealing belt are arranged correspondingly.

7. An anti-overflow powder fluidized bed anti-corrosion device according to claim 1, characterized in that, The fluidizing plate includes a main fluidizing plate and an inclined fluidizing plate. The inclined fluidizing plate is arranged at the end of the main fluidizing plate and the angle relative to the main fluidizing plate is adjustable, so as to adjust the wind direction.

8. An anti-overflow powder fluidization tank anti-corrosion device according to claim 7, characterized in that, The inclined fluidizing plate is connected to the fluidizing plate through a rotating shaft, and the rotating shaft is a damping rotating shaft.

9. The anti-overflow powder fluidization tank anti-corrosion device according to claim 8, characterized in that, It also includes a control unit, which realizes inflation or deflation of the air bag by controlling the pneumatic pressure regulating mechanism.

10. An anti-overflow powder fluidization tank anti-corrosion method, characterized in that, Adopting the anti-powder-overflow fluidized tank anti-corrosion device described in claim 9, it includes the following steps: The steel pipe is placed on the roller. Adjust the angle of the inclined fluidizing plate to an inclined state. Raise the fluidized bed through the control unit. Adjust the air pressure inside the air bag through the pneumatic pressure regulating mechanism. According to the compression amount of the sealing belt and the indication of the safe air pressure of the air bag, on the premise of ensuring that the compression amount of the sealing belt and the air pressure inside the air bag are within the safe range, adjust the height of the fluidized bed to an appropriate height.

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