KR102455263B1 - Liquid storage tank inner surface coating device and coating method - Google Patents

Abstract

The present invention relates to an apparatus for coating an inner surface of a liquid storage tank and a coating method, which can block the inflow of foreign substances, can reduce a worker's exposure to a harmful environment, can facilitate entry and exit and block the inflow of foreign substances by locating, on a lower side of a tank, an entrance for a coating operation from the bottom of the tank, and can quickly and uniformly apply a resin to an inner surface of a tank in a semi-automation mode. More specifically, the present invention comprises: a target tank with an inner surface where a coating operation is to be performed; a transfer shaft installed in an inner space of the tank in a longitudinal direction; a transfer unit moving in a transverse direction along the transfer shaft; a rotation driving unit located on a front surface of the transfer unit and providing rotational force; a rotation block unit receiving a resin molten solution of fiber-reinforced plastic (FRP); and a coating unit connected to the rotation block unit and applying the molten solution. Accordingly, a coating layer is formed by coating the inside of the tank with the FRP-based resin molten solution in a circumferential direction in a semi-automation mode. Therefore, work efficiency and work speed are increased.

Description

Liquid storage tank inner surface coating device and coating method

The present invention relates to a tank for liquid storage, and more particularly, when coating the inner surface of the tank body made of a metal material for storing various liquids with synthetic resin, it is convenient and can be implemented in a semi-automated manner in a safe working environment. It relates to a liquid storage tank inner coating device and coating method applicable to industry, tank post-processing industry, and tank repair industry related business.

Conventionally, oil storage tanks for underground burial (hereinafter referred to as 'underground oil storage tanks') are made of steel plates, and steel tanks coated with anti-corrosive paint on the outer surface have been used to cope with corrosion. However, since it is buried underground, it is not possible to completely prevent corrosion of the steel sheet due to corrosion by acid soil and electric corrosion by electric potential difference, so contents leaking occurs.

As a solution to this problem, a steel fiber-reinforced plastic double body tank (hereinafter referred to as “SF double body tank”) is coated with fiber-reinforced plastic at regular intervals on an underground oil storage tank made of steel sheet and installed with facilities to detect leakage of dangerous substances. ' The SF double body tank has more resistance to corrosion than steel tanks, but as it is used for a long time, pinholes due to corrosion occur and it is considered that it cannot have sufficient corrosion resistance.

For this reason, a fiber-reinforced plastic double body tank (hereinafter referred to as 'FF double body tank') is coated with fiber-reinforced plastic at regular intervals on an underground oil storage tank made of fiber-reinforced plastic, and a facility is installed to detect leakage of dangerous substances. ) was developed. The FF double body tank has a problem in that productivity is lowered because it is difficult to set the interval in order to detect the leakage of dangerous substances inside the tank.

In order to solve this problem, Korean Patent No. 172106 'double cylindrical body of FRP tank' has been proposed. This patent discloses an inner body made of fiber-reinforced plastic, an outer body made of fiber-reinforced plastic, a reinforcing rib installed on the outer periphery of the outer body, and a sheet of thermoplastic plastic material installed between the inner body and the outer body; It includes a film installed between the outer body and the sheet, and the sheet made of the thermoplastic plastic material has the same curvature as the curvature of the inner body and has irregularities on its surface. And the tip of the detector of the leak detection device is installed so as to be located in the gap layer between the inner body and the outer body. However, this patent forms a thermoplastic sheet and film with irregularities and laminates it between the inner body and the outer body, so the workability is poor and the bonding surface between the thermoplastic plastic sheet and the film is destroyed over a long period of use, so the inner body and the outer body There is a concern that they may be separated from each other.

Such a tank made of a double body according to the prior art has a problem in that the price is high and it is difficult to manufacture because it has to be manufactured in a standardized form according to the size of the tank.

In addition, the tank made of a double body according to the prior art is a cumbersome problem in that the inner body and the outer body must be separately attached, and there is a problem that it is impossible to apply when the tank body is manufactured in advance.

For this reason, for work, the entrance of the tank is positioned at the bottom to secure the safety of entry and exit and prevent the inflow of foreign substances. There is an urgent need for an improved liquid storage tank inner surface coating device and its coating method to prevent poisoning by chemical components, uniformly perform coating thickness and quality, and variably adjust to the size of the tank.

Registration No. 10-0959986 (fiber-reinforced plastic double body underground oil storage tank) Registration No. 10-1761169 (oil storage tank) Registration No. 20-0283403 (Double shell of gas station oil tank using FRP panel)

The present invention has been devised to solve the above problems, and a device for coating the inner surface of a tank for liquid storage and a method for coating the same for forming a coating layer by applying a fiber-reinforced plastic-based resin melt to the inner circumferential direction of the tank in a semi-automated manner Its purpose is to provide

And, another object of the present invention is to allow the molten resin to be uniformly and repeatedly applied in an automated manner in the circumferential and longitudinal directions of the inner surface of the tank.

In addition, another object of the present invention is to facilitate the worker's entry and exit by arranging the injection port to face downward during the resin melt application operation and to minimize the inflow of foreign substances.

In addition, another object of the present invention is to make it possible to adjust and install appropriately without being constrained by the size of the tank through the adoption of a continuous connection structure of the transfer shaft and adjustment of the length of the applicator.

Here, another object of the present invention is to ensure smooth flow of the melt through the heating process before the coating operation of the melt resin and to remove all the residual melt of the resin after the coating operation.

A liquid storage tank inner surface coating device according to an embodiment of the present invention includes a transport shaft installed to be supported at both ends in the longitudinal direction of the tank inner space, a transport part that is inserted into the transport shaft and geared to move in the horizontal direction, and the transport part A rotary drive unit that provides a rotational operating force forward, a rotary block portion that is connected to the rotary drive portion and rotates and receives a resin melt of fiber-reinforced plastic (FRP), a plurality of pieces are installed on the outer peripheral surface of the rotary block portion and receive the resin melt and receive the tank In the liquid storage tank inner surface coating device comprising an applicator for applying a molten resin while in contact with the inner surface of the transfer shaft, the transfer shaft is formed in plurality with a coupling shaft formed at one end and a coupling groove formed at the other end, and the outer circumferential surface of the conveying shaft A transfer gear formed in a portion, and a support installed on a transfer shaft supporting both ends of the tank among the transfer shafts are provided.

delete

In addition, the transfer unit provides a transfer block slidably installed on the transfer shaft, and a transfer motor geared with the transfer gear of the transfer shaft to one side of the transfer block.

delete

delete

delete

In the method for coating the inner surface of a tank for liquid storage according to an embodiment of the present invention, a sling is hung on both ends of the tank and the tank inlet is rotated to position the lower side and placed on a jig. After passing through the position conversion step, the tank After entering the inside of the tank through the injection port and removing foreign substances, a plurality of conveying shafts are connected and fixed at both ends of the inner space of the tank with the drive block of the rotary driving unit, the rotation block of the rotating block and the injection block inserted into the conveying shaft. After passing through the shaft installation step and the transfer shaft installation step, an injection pipe for supplying the resin melt to the injection block is connected, and the roll brush to the rotation block is connected to the variable pipe to the fixed pipe to contact the inner surface of the tank. After passing through the application part installation step, the melt injection step of injecting the resin melt through the injection pipe, and the melt injection step, the roll brush rotates by operating the rotary motor of the rotary drive unit and the resin melt is applied to the inner surface of the tank. The application step of applying the application step, the transfer step of moving the transfer motor in the horizontal direction along the transfer axis by operating the transfer motor while going through the application step, the application step and the transfer step are performed and when the application of the longitudinal inner surface of the tank is completed, the transfer shaft , a dismantling step of removing the transfer unit, the rotary driving unit, the rotating block unit, and the application unit, a finishing step of applying a molten resin solution using manpower to both ends of the tank after passing through the dismantling step, and after passing the closing step, the resin A drying step of drying the melt is provided.

And, after the step of installing the applicator, a heating step of heating the injection block, the rotation block, the fixed pipe, the variable pipe, and the roll brush by injecting high-temperature air through the injection pipe is provided.

In addition, it provides a removal step of removing the residual resin melt in the injection block, the rotation block, the fixed pipe, the variable pipe, and the roll brush by injecting high-temperature air through the injection pipe after the transfer step.

According to an embodiment of the present invention, there is an effect of increasing the working efficiency and speed by forming a coating layer by applying the fiber-reinforced plastic-based resin melt to the inner circumferential direction of the tank in a semi-automated manner.

In addition, the molten resin can be uniformly and repeatedly applied in an automated manner in the circumferential and longitudinal directions of the inner surface of the tank, thereby reducing operator fatigue and maintaining uniform quality.

In addition, when the resin melt application operation is performed, the injection port is arranged so that the worker can enter and exit smoothly, and the inflow of foreign substances is minimized, thereby securing work safety and preventing defects.

In addition, by adopting a continuous connection structure of the transfer shaft and adjusting the length of the applicator, it is possible to adjust and install it according to the size of the tank without being constrained by the size of the tank, thereby increasing versatility.

Here, the smooth flow of the melt through the heating process before the coating operation of the melt resin and the removal of all the residual melt of the resin after the coating operation have the effect of not affecting the next operation.

1 is a front view of a liquid storage tank according to the present invention;
2 is a side view of a liquid storage tank according to the present invention;
3 is a partially exploded perspective view of the tank inner surface coating device for liquid storage according to the present invention;
Figure 4 is an exploded perspective view of the rotation driving part and the rotation block part of the tank inner surface coating device for liquid storage according to the present invention;
5 is a perspective view of the application part of the tank inner surface coating device for liquid storage according to the present invention;
6 is a combined partial cross-sectional view of the tank inner surface coating device for liquid storage according to the present invention;
7 is an installation view of the tank inner surface coating device for liquid storage according to the present invention installed inside the tank;
8 is a flowchart showing a coating method using an inner surface coating device for liquid storage according to the present invention;
9 and 10 are front views showing the process of changing the position of the tank to be coated on the inside;
11 is a side view showing the process of changing the position of the tank to be coated on the inside;
12 is an exemplary view of a coating operation using the tank inner surface coating device for liquid storage according to the present invention;
13 is a movement diagram of a coating operation using an inner surface coating device for liquid storage according to the present invention;
14 is a circulation diagram of the molten resin during coating operation using the inner surface coating device for liquid storage according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present invention pertains can easily carry out the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Throughout the specification, like reference numerals are assigned to similar parts.

Hereinafter, the configuration of the present invention will be described with reference to the accompanying drawings, the target tank 1 to be coated on the inner surface, the transport shaft 10 installed in the longitudinal direction of the internal space of the tank 1, the transport shaft ( 10), the transfer unit 20 moving in the horizontal direction, the rotation drive unit 30 located in front of the transfer unit 20 and providing rotational force, and the rotation block unit 40 receiving the resin melt of fiber-reinforced plastic (FRP) ), the coating device 100 is constituted by an applicator 50 connected to the rotating block part 40 to apply a molten resin solution.

As shown in Figures 1 to 7, the tank 1 applied to the coating device 100 is manufactured in various shapes and sizes, but in the present invention, for the purpose of understanding the description, the overall cylindrical shape and both ends are rounded. The tank inlet 3 is formed on one side for filling or cleaning the contents, and it is made of metal as a whole to store oil, chemicals, toxic substances, etc., and prevents leakage of contents or reaction with metal. In order to prevent it, the inner surface of the tank 1 is formed to be utilized by coating the resin melt of fiber-reinforced plastic (FRP).

And, the transfer shaft 10 of the coating device 100 is installed to be supported at both ends in the longitudinal direction of the inner space of the tank (1).

The conveying shaft 10 is formed with a coupling shaft 11 formed at one end and a plurality of coupling grooves 12 formed at the other end, and a male spiral is formed on the outer surface of the coupling shaft 11 and the coupling groove is formed. A female spiral is formed in 12, and a plurality of conveying shafts 10 are connected in a line to correspond to the length of the tank 1 by the spiral coupling of the coupling shaft 11 and the coupling groove 12.

The conveying shaft 10 is preferably made of a metal material, and the conveying gear 13 formed on a portion of the outer peripheral surface of the conveying shaft 10 is formed.

Among the transport shafts (10), a support member (14) installed on the transport shaft (10) supported at both ends of the tank (1) is formed.

The support 14 is to support the transfer shaft 10 with a certain rigidity inside the tank 1, and has a longitudinal cross section of 'T' so as to be helically fastened to the coupling shaft 11 or the coupling groove 12. It is formed in the shape of a ruler, and after connecting the transfer shaft 10 according to the length of the internal space of the tank 1, fastening the support 14 to both ends, and placing it at the center point of the tank 1, 14) to be firmly supported on both inner ends of the tank (1).

Then, the conveying part 20 is inserted into the conveying shaft 10 and gear-connected to move in the horizontal direction is formed.

The transfer unit 20 forms a transfer block 21 that is slidably installed on the transfer shaft 10 .

A transfer motor 22 gear-connected to the transfer gear 13 of the transfer shaft 10 is formed on one side of the transfer block 21 .

A transfer pinion gear 23 connected to the transfer gear 13 is formed on the transfer motor 22 of the transfer unit 20 .

In addition, a rotational driving unit 30 that provides a rotational operating force to the front of the conveying unit 20 is formed.

The rotary driving unit 30 is fitted to the transfer shaft 10 and forms a sliding driving block 31 , which is coupled to the rear of the transfer block 21 and has one side open. A rotation space 33 is formed on the upper surface.

A rotation motor 32 coupled to one side of the driving block 31 is formed, and a rotation gear 34 is formed in the rotation motor 32 to be partially inside the rotation space 33 of the driving block 31 . formed to be exposed.

In addition, it is connected to the rotation drive unit 30 to rotate and form a rotation block unit 40 receiving a resin melt of fiber-reinforced plastic (FRP).

The rotation block 40 is fitted to the transfer shaft 10 and forms a rotation block 41 having one end connected to the rotation motor 32 of the rotation driving unit 30 and gear.

One end of the rotation block 41 is partially inserted into the rotation space 33 of the drive block 31 and forms an outer gear 45 connected to the rotation gear 34 and gear on the outer surface, and the rotation block 41 A coupling hole 36 to which the applicator 50 is coupled is formed on the other side of the .

An injection block 42 which is slidably coupled to the central side of the rotation block 41 and formed so that the molten resin solution flows on the contact surface is formed.

The injection block 42 is formed to be slidably driven on the rotation block 41 so that when the rotation block 41 rotates, the injection block 42 is formed to rotate idle.

A resin injection pipe 46 through which the molten resin flows is connected to the injection block 42, and between the rotation block 41 and the injection block 42, a rotation flow hole 43 through which the molten resin can flow, respectively, and An injection flow hole 44 is formed.

On the other hand, the application unit 50 is fastened to the rotation block 41 of the rotation block unit 40 to form a fixed pipe 51 through which the molten resin flows.

A roll brush 53 discharged by the injection force of the molten resin is formed at the end of the variable pipe 52 that is inserted into the fixed pipe 51 and slides.

The roller body 54 of the roll brush 53 is integrally connected with the variable pipe 52, the molten resin is discharged from both sides, and the brush body 56 on which the brush 55 is formed is formed to rotate freely.

The brush body 56 is formed with an empty space inside, and a discharge hole 57 through which the molten resin is discharged is formed at a point where it does not interfere with the brush 55 .

The operation speed and control of the transfer unit 20 and the rotational driving unit 30 are configured to be power control and operation control through a separate control unit.

The state of use of the method for coating the inner surface of the tank for liquid storage configured as described above is as follows.

As shown in Figures 1 to 14, the coating method is a position conversion step (S1) for changing the position of the tank (1), a transfer shaft installation step of installing the transfer shaft (10) inside the tank (1) (S2), an applicator installation step of installing the applicator 50 on the transfer shaft 10 (S3), a melt injection step of injecting a resin melt (S4), a coating step of applying to the inner surface of the tank 1 ( S5), the dismantling step (S7) of removing the transfer shaft 10, the transfer unit 20, the rotation drive unit 30, the rotation block unit 40, and the application unit 50, applying the molten resin using manpower A finishing step (S8) and a drying step (S9) of drying the melted resin are performed.

First, a position conversion step (S1) of placing the slings 2 on both ends of the tank 1 and rotating the tank inlet 3 to be positioned on the lower side is carried out on the jig 4 .

The tank (1) is arranged so that the tank inlet (3) faces downward by hanging the sling (2) on a lifting equipment such as a crane, and the operator uses a ladder to the tank inlet (3) inside the tank (1) withdraw into

After that, after the position conversion step (S1), it enters the inside of the tank 1 through the tank inlet 3 and removes foreign substances. , A transfer shaft installation step ( S2) is carried out.

The inside of the tank (1) is cleaned to prevent the occurrence of bubbles or floatation when the coating is performed in the presence of various kinds of dust or by-products during manufacturing when the tank (1) is manufactured. .

The connecting length of the conveying shaft 10 is adopted as a number suitable for the length of the inner space of the tank 1, and at the same time connecting the coupling shaft 11 and the coupling groove 12 to each other, the driving block 31 of the rotary driving unit 30 ), the rotation block 41 and the injection block 42 of the rotation block part 40 are installed while sandwiching, and the support 14 in contact with the inner surface of the tank 1 is provided at the outermost end of the transfer shaft 10 . It is combined to adjust the fastening interval to closely support the tank (1).

Next, after the transfer shaft installation step (S2), the resin injection pipe 46 for supplying the molten resin to the injection block 42 is connected, and the roll brush 53 is placed on the rotation block 41 in the tank (1). ) to perform the application part installation step (S3) of connecting the variable pipe 52 to the fixed pipe 51 so as to contact the inner surface.

The variable pipe 52 is fitted so as to be sealed inside the fixed pipe 51 and can be adjusted in length, and the length can be adjusted and dismantled by tightening and disassembling the fastener 58 for fixing.

Next, after the application part installation step (S3), the melt injection step (S4) of injecting the resin melt through the resin injection pipe 46 is performed.

The resin melt is supplied using a separate melt supply device.

After that, while going through the melt injection step (S4), the rotation motor 32 of the rotary driving unit 30 is operated to rotate the roll brush 53 and the application step of applying the melted resin to the inner surface of the tank 1 (S5) ) is implemented.

Looking at the application step (S5) in detail, the molten resin is supplied from the supply device -> the resin injection pipe 46 -> the injection flow hole 44 of the injection block 42 -> the rotation flow hole 43 of the rotation block 41 -> Fixed pipe 51 of the applicator 50 -> Variable pipe 52 -> Roller body 54 -> When discharged through the discharge hole 57 of the brush body 56, the roll brush 53 is While in contact with the inner surface of the tank, a fiber-reinforced plastic-based resin melt is applied to the inner surface of the tank (1).

Next, a transfer step (S6) of moving the transfer motor 22 of the transfer unit 20 in the horizontal direction along the transfer shaft 10 is performed while passing through the application step (S5).

The operation speed and control of the transfer unit 20 and the rotary drive unit 30 are power control and operation control made through a separate control unit.

Next, when the coating step (S5) and the transfer step (S6) are performed and the application of the longitudinal inner surface of the tank 1 is completed, the transfer shaft 10, the transfer unit 20, the rotary drive unit 30, and the rotation A dismantling step (S7) of removing the block part 40 and the application part 50 is performed.

The dismantling step (S7) is performed to cleanly remove the molten resin remaining in each component and remove it using a separate removal solvent to prevent hardening and sticking.

Thereafter, after the dismantling step (S7), a finishing step (S8) of applying the molten resin solution to both inner ends of the tank 1 is performed by manpower.

In the finishing step (S8), the inner both ends of the tank 1 are manually coated with a roller device using manpower because it is impossible to perform a coating operation using the coating device 100 .

In addition, after the finishing step (S8), a drying step (S9) of drying the resin melt is performed, and the drying time varies depending on the temperature, the thickness of the coating, and the components of the resin melt. It is recommended to dry for about 2-3 days, and the drying period can be adjusted by checking the drying condition.

In addition, after the application part installation step (S3), hot air is injected through the resin injection pipe 46 to the injection block 42, the rotation block 41, the fixed pipe 51, and the variable pipe 52. , a heating step (S10) of heating the roll brush 53 may be performed.

In the heating step (S10), the injection block 42, the rotation block 41, the fixed pipe 51, the variable pipe 52, and the roll brush 53 itself are cooled even though the resin melt flows in a heated state. This is a process for increasing the fluidity of the molten resin by using high-temperature air to increase the fluidity of the molten resin by using high-temperature air in order to prevent smooth flow of the molten resin on the reverse side and to prevent the deposition phenomenon from lowering the fluidity.

In addition, after the transfer step (S6), high-temperature air is injected through the resin injection pipe 46 to the injection block 42, the rotation block 41, the fixed pipe 51, the variable pipe 52, and the roll brush. A removal step (S11) of removing the residual resin melt in the inside of (53) is performed.

The removing step (S11) is to conveniently remove the resin melt remaining in the injection block 42, the rotation block 41, the fixed pipe 51, the variable pipe 52, and the roll brush 53 after the coating operation is completed. It is a process to remove.

In the above description of the coating apparatus 100 and the coating method of the present invention with reference to the accompanying drawings, a specific shape and direction have been mainly described, but the present invention can be variously modified and changed by those skilled in the art, and these modifications and changes are It should be construed as being included in the scope of the present invention.

1: Tank 2: Sling
3: tank inlet 4: jig
10: feed axis 11: coupling axis
12: coupling groove 13: transfer gear
14: support
20: transfer unit 21: transfer block
22: feed motor 23: feed pinion gear
30: rotation drive unit 31: drive block
32: rotation motor 33: rotation space
34: rotary gear 35: outer gear
36: coupling hole
40: rotation block 41: rotation block
42: injection block 43: rotational flow hole
44: injection flow hole
50: applicator 51: fixed pipe
52: variable piping 53: roll brush
54: roller body 55: brush
56: brush body 57: discharge hole
58: fastener 100: coating device
S1: Position conversion step S2: Feed shaft installation step
S3: Applicator installation step S4: Melt solution injection step
S5: application step S6: transfer step
S7: dismantling stage S8: closing stage
S9: drying step S10: heating step
S11: Removal step

Claims (9)

Transport shaft 10 installed to be supported at both ends in the longitudinal direction of the tank (1) inner space,
The conveying part 20 is inserted into the conveying shaft 10 and gear-connected to move in the horizontal direction,
A rotational driving unit 30 that provides a rotational operating force to the front of the conveying unit 20,
The rotation block unit 40 connected to the rotation drive unit 30 and rotated and supplied with a resin melt of fiber-reinforced plastic (FRP);
It is installed on the outer circumferential surface of the rotation block part 40 in plurality and comprises an application part 50 for receiving the melted resin solution and applying the melted resin solution while in contact with the inner surface of the tank 1,
The transfer shaft 10 is formed in plurality with a coupling shaft 11 formed at one end and a coupling groove 12 formed at the other end,
A transfer gear 13 formed on a portion of the outer peripheral surface of the transfer shaft 10,
The inner surface coating apparatus of a tank for liquid storage, characterized in that it comprises a support 14 installed on the transfer shaft (10) supported at both ends of the tank (1) of the transfer shaft (10).
delete The transfer block 21 according to claim 1, wherein the transfer unit 20 is slidably installed on the transfer shaft 10;
A liquid storage tank inner surface coating device, characterized in that it comprises a transfer motor (22) gear-connected to the transfer gear (13) of the transfer shaft (10) to one side of the transfer block (21).
delete delete delete Position conversion step (S1) of hanging the slings (2) on both ends of the tank (1) to rotate the tank inlet (3) to the lower side and placing it on the jig (4);
After the position conversion step (S1), it enters the inside of the tank 1 through the tank inlet 3 and removes foreign substances. A transfer shaft installation step (S2) of connecting a plurality of transfer shafts 10 in a state in which the rotation block 41 and the injection block 42 of the block part 40 are inserted and fixing them at both ends of the inner space of the tank 1 (S2) ,
After the transfer shaft installation step (S2), the resin injection pipe 46 for supplying the resin melt to the injection block 42 is connected, and the roll brush 53 is applied to the rotation block 41 on the inner surface of the tank (1). An application part installation step (S3) of connecting the variable pipe 52 to the fixed pipe 51 so as to contact the
After the application part installation step (S3), the melt injection step (S4) of injecting the resin melt through the resin injection pipe (46),
While passing through the melt injection step (S4), the roll brush 53 rotates by operating the rotation motor 32 of the rotary drive unit 30, and the application step of applying the molten resin to the inner surface of the tank 1 (S5),
A transfer step (S6) of moving the transfer motor 22 of the transfer unit 20 in the horizontal direction along the transfer shaft 10 while going through the application step (S5);
When the application step (S5) and the transfer step (S6) are performed and the application of the longitudinal inner surface of the tank 1 is completed, the transfer shaft 10, the transfer unit 20, the rotation drive unit 30, and the rotation block unit 40 ), a dismantling step of removing the application unit 50 (S7),
After the dismantling step (S7), the finishing step (S8) of applying the molten resin solution to both inner ends of the tank (1) by manpower;
After the finishing step (S8), the liquid storage tank inner surface coating method, characterized in that it comprises a drying step (S9) of drying the resin melt.
8. The method according to claim 7, wherein, after the application part installation step (S3), high-temperature air is injected through the resin injection pipe (46), and the injection block (42), the rotation block (41), the fixed pipe (51), and the variable A method for coating the inner surface of a tank for liquid storage, characterized in that it comprises a heating step (S10) of heating the pipe (52) and the roll brush (53).
According to claim 7, After the transfer step (S6), by injecting high-temperature air through the resin injection pipe (46) injection block (42), the rotation block (41), the fixed pipe (51), the variable pipe ( 52), a liquid storage tank inner surface coating method, characterized in that it comprises a removing step (S11) of removing the residual resin melt inside the roll brush (53).

Images