KR102280053B1 - Steel pipe manufacturing method and coated steel pipe and its device applying phenalkamine epoxy paint after using inner diameter shorting machine - Google Patents

Abstract

The present invention relates to a method for manufacturing a steel pipe to which phenalkamine epoxy paint is applied after using an inner diameter shot blast machine, a coated steel pipe, and a device therefor. The method includes an internal and external shot blasting step, a preheating step, a cap mounting step, an outer surface coating step, a cooling step, an inner surface shot blasting step, and an epoxy coating step, and an inner surface coating step. According to the present invention, the internal diameter shot blasting of the steel pipe is performed quickly and accurately.

Description

{Steel pipe manufacturing method and coated steel pipe and its device applying phenalkamine epoxy paint after using inner diameter shorting machine}

The present invention relates to a method for manufacturing a steel pipe to which phenalkamine epoxy paint is applied after using an inner diameter short machine, a coated steel pipe and an apparatus therefor, and more particularly, to an inner diameter coating after shorting the inner and outer diameters, coating the outer diameter with an epoxy paint, and cooling After blocking both sides of the steel pipe in the process of performing shot blasting with a shot machine once more for the previously corroded inner diameter, shot blasting and coating the shot balls strongly, safely and quickly; It is a polyamine-curable type 2 epoxy paint with a curing agent containing phenalkamine applied. It does not freeze even when coated at low temperatures, has strong adhesion, does not cause condensation, and is a quick-drying type that maintains strong bonding properties. It relates to a steel pipe manufacturing method coated with phenalkamine epoxy paint and a device therefor.

In general, steel pipes used for transporting various fluids, such as gas pipes and water pipes, form respective coating layers on the inside and outside to prevent rust from occurring or damage to the product from external impact. At this time, the paint used for the coating layer of the steel pipe will use liquid resin or resin powder.

The most commonly used anticorrosive method for coating the outer surface of steel pipe is to coat the outer surface of the steel pipe with polyethylene or paint with coltal enamel or asphalt, and paint coating with a polymer compound recognized as a relatively new anticorrosive material. As a method, there is a method of coating an epoxy-based resin coating or a polyurethane-based resin coating.

In addition, it is difficult to explain the adhesion and durability of the coating agent simply by physical or chemical attachment because there are various variables for the bonding of the coating agent to the steel pipe, such as the roughness of the bonding surface or the plastic deformation of the coating agent. However, in order to prevent corrosion and contamination of sewer pipes, many have been treated with a film using an epoxy resin.

As such, it has been mainly coated with an epoxy resin to prevent corrosion and contamination of water pipes or sewage pipes, but recently, it is known that the epoxy resin contains many harmful substances and has many side effects when used as a water pipe. Therefore, much effort is being put into the development of paints using polyurethane or polyurea.

The polyurethane paint has poor adhesion and non-uniform reactivity, which makes it difficult to put into practical use. In order to increase the physical adhesion strength of the coating agent, the surface of the steel pipe is treated by blasting with a shot, sand, etc. At the same time, methods such as

Published Patent Document 1 discloses a surface treatment step of removing scattered foreign substances by a shot blasting method for coating the inner and outer diameters of the steel pipe; a steel pipe heating step of supplying the surface-treated steel pipe to a steel pipe driving device and a driving guide device and heating it to maintain a temperature of 150 to 300° C. through a gas supplied from the heating pipe while rotating; an outer diameter coating step of forming an epoxy coating layer, an adhesive resin layer, and a polyethylene layer on the outer diameter by using the raw material supplied from the outer diameter coating device while rotating the heated steel pipe; a cooling step of cooling the coating layer of the steel pipe coated with the outer diameter not to be separated; In the method of manufacturing a coated steel pipe formed through an inner diameter coating step of coating a coating layer on the inner diameter while rotating the steel pipe, the heating step of the steel pipe heats the central portion of the steel pipe to 150 to 250 ° C, and both ends are 180 to Heating to 300 ℃, the inner diameter coating step supplies epoxy powder to the inner diameter and rotates at 120 to 230 rpm per minute, the moving speed of the powder is 50 to 70 km/hr, and coating for 7 to 17 minutes to a thickness of 400 to 550 μm. It is disclosed for an inner surface-coated steel pipe using an epoxy powder coating, characterized in that it is molded by coating the epoxy powder coating layer and a method for manufacturing the same.

The inner coated steel pipe using the epoxy powder coating and its manufacturing method perform powder coating without the need for a powder spraying device, thus shortening the coating time of the steel pipe and facilitating the coating operation. By coating the inner diameter of the product, it is possible to prevent contamination of the surroundings and greatly reduce the space of the production facility.

However, in the conventional technique as described above, because the inner and outer surfaces of the steel pipe are coated in a state where the polyethylene powder is not completely removed while the inner and outer surfaces of the steel pipe are shot blasting, the adhesion is not only reduced, and when a certain period of time has elapsed, the polyethylene oil powder itself Since a coating film is formed thereon, there is a problem in that the coating life is shortened.

In addition, the roughness of the steel pipe subjected to the shot blasting process was 50 to 80 μm, and there was a problem in that the adhesion performance of the coating film was deteriorated because the internal coating material did not penetrate deeply.

A normal epoxy paint is comprised by mixing an epoxy resin and a hardening|curing agent. Epoxy is a material having an epoxy active group (Epoxide group) in its chemical structure, and an epoxy resin applied commercially, especially for paint, means a material having at least two epoxides.

There are various types of these epoxy resins, and a curing agent is necessarily mixed with the epoxy paint. That is, epoxy paint has excellent adhesion, excellent mechanical strength, excellent water resistance and chemical resistance, and has excellent dimensional stability due to little change due to curing. It has a characteristic that it takes a long time and necessarily mixes a curing agent.

A curing agent commonly referred to as an epoxy curing agent, also called an amine curing agent, reacts with an epoxy resin to cure it into a mesh-type thermosetting resin. In chemical terms, it refers to an amine compound with active hydrogen.

Although several types of epoxy paints are used, the reason why they appear as different types of products is because the curing agents used are different and the mixing ratios are different, and the physical properties of the epoxy paints are substantially influenced by the curing agent.

As a conventional epoxy curing agent, polyamine, amine adduct, polyamide, etc. have been applied.

Polyamine forms a hard and dense coating film, but has the disadvantages of being vulnerable to moisture at the initial stage of coating due to its molecular structure and slow curing rate at low temperatures.

Amine adduct is a curing agent made mainly by addition reaction of an aliphatic amine (DETA) to an epoxy resin to compensate for the disadvantages of polyamine. Although excellent, there is a disadvantage that the viscosity is high and the low temperature curing is still slow.

Polyamide is made by the dehydration condensation reaction of fatty acid and DETA. It has excellent coating performance and low price, so it is the most used curing agent. The film is flexible, so it has excellent impact resistance, excellent water/rust resistance, and skin irritation. Although this is small, there is a disadvantage that heat resistance and chemical resistance are poor, and low temperature curing is slow.

All of these conventionally used curing agents are characterized by a slow curing rate at a low temperature.

In addition, such a conventional epoxy paint has a disadvantage that it is very vulnerable to moisture. In particular, conventional epoxy paints, as mentioned above, delay the subsequent process and deteriorate the quality of the coating film due to slow curing, which is the biggest problem that occurs when painting an epoxy paint in the winter season.

That is, if the curing of the epoxy is delayed at a low temperature for a long time, the main agent and the curing agent are agglomerated in a non-reacting state, which does not react even after a long time. Therefore, the development of an epoxy paint of a new composition that can improve and solve this problem has been required.

[Patent Document 1] Korean Patent Registration No. 10-1267033 [Patent Document 2] Korean Patent Registration No. 10-1494721 [Patent Document 3] Korean Patent Registration No. 10-1880072 [Patent Document 4] Korean Patent Registration No. 10-0671981 [Patent Document 5] Korean Patent Registration No. 10-1937201

Therefore, it was devised to solve these conventional drawbacks, and the solution of the present invention is to cap both ends of the steel pipe before coating the epoxy paint applying phenalkamine to the inner diameter in the process of coating the inner and outer diameters of the steel pipe. The purpose is to perform shot blasting on the inner diameter of the steel pipe with a predetermined pressure by supplying a shot ball to the inner diameter after installing the steel pipe.

Another solution to the present invention is that, in the epoxy paint coated on the inner diameter of the steel pipe, it is mixed with the main material having the epoxy paint and applied phenalkamine to have excellent (salt) water resistance and abrasion resistance, and does not freeze even in sub-zero weather and is a quick-drying type is intended to be done with

Another problem of the present invention is that the process for installing the cap is performed according to the size of the steel pipe, and after performing the shot blasting by supplying the shot ball, the shot ball is recovered and reused, and the generated dust is removed to make the shot shot. It aims to coat an epoxy paint with phenalkamine applied immediately after blasting.

Another problem of the present invention is that the cap can be removed and attached quickly according to the size of the steel pipe, it is easy to exchange for installation of the cap according to the size of the steel pipe, and the internal diameter shot blasting of the steel pipe can be performed quickly and accurately. An object of the present invention is to provide a method for manufacturing a steel pipe.

According to the present invention, a steel pipe is put into an inclined mounting table of an internal/external diameter shot machine by a conveying means, and an external surface shot part having an external surface spray part at the end in order to shot blast the external surface of the steel pipe and the inner surface of the steel pipe is shot blasting. an inner and outer shot blasting step of injecting a shot ball into the inner and outer surfaces of the steel pipe by entering an inner shot part having an inner spraying part at the end in the longitudinal direction of the steel pipe by a moving unit; preheating to 350 ~ 380 ℃ by putting the inner and outer surface shot blasting finished steel pipe by the inner and outer diameter shot machine into a preheating furnace; mounting caps for rotating the steel pipe to both ends of the preheated steel pipe; While being mounted on the cap for rotating the steel pipe and rotating the steel pipe based on the longitudinal central axis, the FBE coating part performs powder epoxy coating on the outer surface of the steel pipe, and the adhesive coating part coats the adhesive on the outer surface of the epoxy-coated steel pipe, , an outer surface coating step of coating PE on the outer surface of the steel pipe coated with an adhesive by the PE coating unit; removing the cap for rotating the steel pipe, and cooling the steel pipe by spraying water therein; The cooled steel pipe is seated on the inclined base of the inner diameter shot machine, the transport boom is put into the inside of the steel pipe by the transfer unit, and the shot ball is rotated and sprayed by the impeller spraying unit provided at the end to perform internal shot blasting. proceeding; And in a state in which the inner surface shot blasting is completed, the steel pipe is rotated by the rotating roller, the epoxy spraying transfer boom having an epoxy spray nozzle at the end is put into the steel tube by the boom transfer bogie, and the inner surface of the steel tube is coated with epoxy step; Coating the inner surface in an inner surface coating machine that rotates the inner surface shot blasting finished steel pipe and coats an epoxy paint including a curing agent having phenalkamine mixed with a main material and a main material having an epoxy resin; including;
The step of performing the inner short blasting is,
A rotating step of loading the cooled steel pipe onto the inclined base, and an unloading step of unloading the internal shot blasting finished steel pipe,
A short ball transfer belt is installed on one side of the transport boom that is connected to the bogie and moves reciprocally, and the shot balls are supplied to a short ball supply box equipped with a plurality of rotary blades, and then discharged from the short ball supply hole, and the plurality of rotary blades rotate. A short ball supply step comprising a boom device for transport discharging to the inner diameter of the steel pipe;
A cap device for an inlet inner diameter shot consisting of a cap body through which the transport boom device penetrates, the boom guide supporting the transport boom on the lower side is height-adjustable, and a cap body having a shot ball discharge part below the inlet internal diameter short cap. A cap step for an inlet-side inner diameter short comprising:
A discharge-side inner-diameter short cap to which one end of the steel pipe is fixed is installed, and a center moving bar movable in the severance direction is installed on the reinforcing bar inside the cap body having a short ball discharge part downward, and protrudes in the direction of the discharge-side inner diameter short cap A discharge-side inner-diameter short cap step comprising a cap device for a discharge-side inner-diameter shot consisting of a steel pipe pedestal having a fixing rod coupled to and separated from the installed installation table; It is characterized in that it comprises a.
In the present invention, a short ball transfer belt is installed on one side of the boom for transfer of the short ball supply step connected to the bogie, and a short ball supply container that receives a shot ball from a short ball supply hopper installed at the tip of the short ball transfer belt. It is connected to the hydraulic pump through this rotary belt, and when the shot ball supply holes are formed at regular intervals in the short ball supply cylinder and the short balls are supplied, the rotary blade installed in the short ball supply cylinder rotates to rotate the short ball into the inner diameter of the steel pipe. It is characterized in that it includes a short ball supply device for supplying to and blasting.
In the present invention, in the cap device for the discharge side inner diameter short cap step of the discharge side inner diameter short cap step, the discharge side inner diameter short cap to which one end of the steel pipe is fixed is fixed to the cap body with a fixing bolt through a fixing ring, and the cap body A reinforcing bar is installed in the horizontal and vertical directions installed inside the center moving bar, the height is adjusted, and the center moving shaft is installed on the upper side, and then a mounting base is formed in the front, and a fixing bar fixed to the center moving bar in a cross shape. It is to include a steel pipe support having a fixed inside the cap for the inlet inner diameter short.
In the present invention, the cap device for the inlet inner diameter short cap step of the inlet inner diameter short cap step is fixed to the cap body with a fixing bolt through a fixing ring by fixing one end of the steel pipe, and a boom guide installed inside the cap body The boom guide part is installed on the lower side to support the movement from the lower side of the transport boom, and the boom height adjusting screw is installed from the center to the upper side so that the height is adjusted.
In the present invention, the cap device for the inlet and outlet inner diameter short in the inlet and outlet inner diameter short cap steps has a hole in which the steel pipe is fixed, and installs caps for the inlet and outlet inner diameter shorts according to the size of the steel pipe It is characterized in that it comprises a finishing member that forms a fixing ring to be installed and is fixed with a fixing bolt.
In the present invention, in the boom device for transport of the short ball supply step, a shot ball transport belt is installed on the upper side of the transport boom to transport and supply the shot balls discharged through the shot ball supply unit in a belt form, and the A shot ball supply hopper is installed at the tip to be inclined downward to collect the transported shot balls in the center so that they are discharged to the short ball supply device,
A frame is installed at the tip of the transport boom and rotated by a rotary belt through a hydraulic pump from one side of the short ball supply trough in the center, and a short ball supply hopper is connected to the short ball supply tub to supply the shot balls at a regular interval. A shot ball supply hole is formed in the hole to supply the inner diameter of the steel pipe at a rotational speed so that it is shot blasting.
Rotating blades are installed at regular intervals in the shot ball supply cylinder, and the shot balls are supplied while rotating, including shot blasting the inner diameter of the steel pipe.
The present invention is characterized in that the inlet and outlet inner diameter short cap devices of the inlet and outlet inner diameter short cap steps have a dust outlet connected to the cap body on the upper side, and the dust outlet connected to a dust collector. .
The present invention provides an epoxy paint coated using an inner surface coater in the step of coating the inner surface, a main material having an epoxy resin; and a curing agent mixed with the subject and having phenalkamine;
The subject and the curing agent are mixed in a volume ratio of 3 to 5: 0.5 to 1.5,
The subject is
Based on the total weight of the main agent, 15 to 30% by weight of bisphenol F-type epoxy resin, 1 to 5% by weight of urea resin, 10 to 15% by weight of titanium dioxide as a color pigment and 0.02 to 0.1% by weight of black pigment, talc as a filler pigment 20 to 40% by weight and 15 to 30% by weight of silica powder, and 10 to 30% by weight of xylene and 1 to 5% by weight of propylene glycol methyl ether as a solvent,
The curing agent,
Based on the total weight of the curing agent, 80 to 89% by weight of phenalkamine, 10 to 15% by weight of xylene as a solvent, and 1 to 5% by weight of a curing accelerator are included.
The present invention is a bogie on which a steel pipe to be coated is seated, a rotating roller for rotating the steel pipe based on a central axis in the longitudinal direction is mounted, and transporting the steel pipe along a process flow by a conveying means; An outer surface shot part for shot blasting the outer surface of the steel pipe, an inner surface shot part for shot blasting the inner surface of the steel pipe, the outer surface short part and the inner surface an inner and outer diameter shot machine for entering a shot part in the longitudinal direction of the steel pipe, and recovering and transporting shot balls from the steel pipe; a preheating furnace for preheating the inner and outer surface shot blasting of the finished steel pipe by the inner and outer diameter shot machine; cap mounting means for mounting caps for rotating the steel pipe to both ends of the preheated steel pipe; An FBE coating part mounted on the cap for rotating the steel pipe to rotate the steel pipe based on the central axis in the longitudinal direction and powder epoxy coating on the outer surface of the steel pipe, and an adhesive coating for applying an adhesive to the outer surface of the epoxy-coated steel pipe an outer coating part having a PE coating part sequentially coating polyethylene on the external surface of the steel pipe coated with an adhesive; a cap removal and cooling unit to which the outer-coated steel pipe is transferred to remove the cap for rotating the steel pipe, and to spray water therein to cool the steel pipe; It has a base on which the cooled steel pipe is seated in an inclined shape, a transport boom that is injected into the inside of the steel pipe by a moving unit and rotates a shot ball by an impeller sprayer provided at the end to perform internal shot blasting. inner diameter shorting device; And in a state in which the inner surface shot blasting is completed steel pipe is rotated by the rotating roller, an epoxy spraying transfer boom having an epoxy spray nozzle at the end is put into the steel tube by the boom transfer bogie to coat the inner surface of the steel tube inner coating machine; an inner surface coating machine for coating an epoxy paint including a curing agent having phenalkamine mixed with a main material and a main material having an epoxy resin while rotating a steel pipe having inner diameter shot blasting completed; including;
The inner diameter short device,
a loading device for loading the cooled steel pipe onto the inclined base; an unloading device for unloading the internal shot blasting finished steel pipe;
A short ball transfer belt is installed on one side of the transport boom that is connected to the bogie and moves reciprocally, supplying the shot balls to the short ball supply trough equipped with a plurality of rotary blades, and then rotating the plurality of rotary blades discharged from the short ball supply hole. and a transport boom device equipped with a short ball supply device that discharges
A cap device for an inlet inner diameter shot through which the boom device for transport passes and a boom guide for supporting the boom for transport is installed so as to be adjustable in height, and comprising a cap body having a short ball discharge part under the cap for an inlet internal diameter shot;
A discharge-side inner-diameter short cap to which one end of the steel pipe is fixed is installed, and a longitudinally movable center moving bar is installed on the reinforcing bar inside the cap body having a short ball discharge part downward, and protrudes in the direction of the discharge-side inner diameter short cap a cap device for a short internal diameter discharge side consisting of a steel pipe pedestal installed with a fixing rod that is coupled to and separated from the installed installation table; It is characterized in that it comprises a.
The present invention is an epoxy paint coated using the inner surface coater, the main material having an epoxy resin; and a curing agent mixed with the main agent and having phenalkamine, wherein the main agent and the curing agent are mixed in a volume ratio of 3 to 5: 0.5 to 1.5,
The subject is
Based on the total weight of the main agent, 15 to 30% by weight of bisphenol F-type epoxy resin, 1 to 5% by weight of urea resin, 10 to 15% by weight of titanium dioxide as a color pigment and 0.02 to 0.1% by weight of black pigment, talc as a filler pigment 20 to 40% by weight and 15 to 30% by weight of silica powder, and 10 to 30% by weight of xylene and 1 to 5% by weight of propylene glycol methyl ether as a solvent,
The curing agent,
Based on the total weight of the curing agent, 80 to 89% by weight of phenalkamine, 10 to 15% by weight of xylene as a solvent, and 1 to 5% by weight of a curing accelerator are included.

delete

delete

delete

delete

delete

delete

In the present invention, in the process of coating the inner and outer diameters of the steel pipe, before coating the epoxy paint to which phenalkamine is applied, caps are installed at both ends of the steel pipe for the purpose of cleaning the inner diameter, and then a short ball is supplied to the inner diameter using a hydraulic system. It is to provide the effect of accurately coating the epoxy paint with phenalkamine by performing short blasting on the inner diameter of the steel pipe with strong pressure so that the coating is made immediately in a cleaned state.

The present invention is an epoxy paint coated on the inner diameter of a steel pipe, mixed with a main material having an epoxy paint, and by applying phenalkamine, it has excellent abrasion resistance as well as (salt) water and chemical resistance, and can be painted on various parts and can be painted in sub-zero weather It is to provide the effect that it is possible to conveniently perform the coating operation even in winter by performing the coating operation that is not frozen even in the winter and is a quick-drying type coating operation.

According to the present invention, the process for installing the cap is performed quickly and conveniently from both sides according to the size of the steel pipe. After the shot blasting is performed by supplying the shot balls, the dust and contaminants generated in the working process are removed and the shot balls are recovered. This is to provide the effect of coating the inner diameter that is not contaminated or corroded by coating the epoxy paint with phenalkamine immediately after it is shot blasted and then reused.

According to the present invention, the cap can be removed and attached quickly according to the size of the steel pipe, exchange for the installation of the cap according to the size of the steel pipe, fixing and supporting both ends of the steel pipe are solid, and the inner diameter shot blasting of the steel pipe is fast And it has the effect of providing a method for manufacturing a steel pipe made accurately.

1a is a chemical structural formula of bisphenol A of the present invention
Figure 1b is the chemical structural formula of bisphenol F of the present invention
2 is a chemical structural formula of the phenalkamine curing agent of the present invention
3 is a plan view showing a preferred embodiment of the present invention;
4 is a front view showing an installation state of the steel pipe forming apparatus of the present invention;
5 is a front view of the installation state for the inner diameter short device of the present invention;
6 is a plan view of an installation state for the inner diameter short device of the present invention;
7 is a side view of an installation state for the inner diameter short device of the present invention;
Figure 8 is a front view of the boom device of the inner diameter short device of the present invention
9 is a front view of the main part of the boom device of the inner diameter short device of the present invention;
10 is a plan view of the main part of the boom device of the inner diameter short device of the present invention;
11 is a side view of the main part of the boom device of the inner diameter short device of the present invention;
12 is a front cross-sectional view of the main part of the boom device of the inner diameter short device of the present invention;
13 is a front view of the installation state on the right side of the boom unit of the present invention;
Figure 14 is a front view of the discharge-side inner diameter short cap device of the present invention
Figure 15 is a side view of the discharge-side inner diameter short cap device of the present invention
Figure 16 is a side view of the operating state of the cap device for a short inner diameter discharge side of the present invention
Figure 17 is a side view of the main part of the discharge-side inner diameter short cap device of the present invention
18 is a side view of the replacement cap of the discharge-side and discharge-side inner diameter short cap device of the present invention
19 is a front view of the main part of the inlet side of the present invention;
20 is a side cross-sectional view of a main part of the cap for an inner diameter short on the outlet side and the inlet side of the present invention;
21 is a block diagram showing the most preferred embodiment of the present invention;

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

In this specification, when a component is referred to as being on another component, it may be directly formed on the other component or a third component may be interposed therebetween. In addition, in the drawings, the thickness of the components is exaggerated for the effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional and/or plan views, which are ideal illustrative views of the present invention. In the drawings, thicknesses of films and regions are exaggerated for effective description of technical content. Accordingly, the shape of the illustrative drawing may be modified by manufacturing technology and/or tolerance. Accordingly, embodiments of the present invention are not limited to the specific form shown, but also include changes in the form generated according to the manufacturing process. For example, the region shown as a right angle may be rounded or have a predetermined curvature. Accordingly, the regions illustrated in the drawings have properties, and the shapes of the regions illustrated in the drawings are intended to illustrate specific shapes of regions of the device and not to limit the scope of the invention. In various embodiments of the present specification, terms such as first, second, etc. are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, the terms 'comprises' and/or 'comprising' do not exclude the presence or addition of one or more other components.

In describing the specific embodiments below, various specific contents have been prepared to more specifically describe the invention and help understanding. However, a reader having enough knowledge in this field to understand the present invention may recognize that it may be used without these various specific details. In some cases, it is mentioned in advance that parts that are commonly known and not largely related to the invention are not described in order to avoid confusion without any reason in describing the present invention in describing the invention.

Hereinafter, the composition of the epoxy paint to which phenalkamine is applied according to the present invention will be described. Phenalkamine according to the present invention contains anacardic acid (Anacardicacid) in the bark of cashew nut, an edible seed of a cashew tree, and a yellow liquid (CNSL: cardanol) in the form of oil is a major component of formaldehyde ( Formaldehyde) and a substance obtained through the chemical reaction of general polyamines (amines). The epoxy paint to which phenalkamine according to the present invention is applied includes a base material having an epoxy resin, and a curing agent mixed with the base material and having phenalkamine.

And, the main agent and the curing agent included in the epoxy paint to which phenalkamine according to the present invention is applied are mixed in a volume ratio of 3 to 5: 0.5 to 1.5.

It is preferable that the epoxy resin contained in the main subject is comprised by the bisphenol F type epoxy resin in this invention. Figure 1a shows the chemical structural formula of bisphenol A, Figure 1b shows the chemical structural formula of bisphenol F.

A general epoxy resin is made by synthesizing epichlorohydrin and bisphenol, and bisphenol A and bisphenol F are one of numerous bisphenols.

As shown in FIGS. 1A and 1B , the overall structure is the same, except for the functionalities attached to the carbon atom (+ part) at the center of the molecule. In FIGS. 1A and 1B , a polymer material in which the —OH moiety at the end of each molecule is substituted with a three-membered ring (epoxide ring) is generally referred to as an epoxy resin.

Theoretically looking at the molecular structure, the water resistance, chemical resistance, and abrasion resistance of the bisphenol A type (type) and bisphenol F type epoxy resins of the molecule are similar, but the bisphenol F type has superior characteristics such as adhesion and impact resistance.

In addition, since the viscosity of the bisphenol F type resin is dramatically lower than that of the bisphenol A type, the workability of the F type paint is superior to that of the bisphenol A type. has

The epoxy curing agent according to the present invention is configured to contain phenalkamine. These phenalkamines are quick-drying, have excellent low-temperature curing properties, and exhibit excellent performance in high humidity conditions.

That is, the greatest advantage of the phenalkamine curing agent according to the present invention is that it has excellent low-temperature curing performance. The biggest problem that occurs when applying epoxy paints in winter is delay in the subsequent process due to slow curing and deterioration of the coating quality (if the curing of the epoxy is delayed at low temperature for a long time, the main agent and the curing agent do not react, and the curing agent will become agglomerated. It does not respond over time). By containing phenalkamine in the epoxy curing agent of the present invention, it is possible to improve these phenomena.

And, the phenalkamine curing agent according to the present invention has the advantage of being strong against moisture at the initial stage of painting. For best performance, moisture must be removed before painting, but the unique hydrophobicity of waste nalkamine molecules minimizes the effect of contact with water molecules, making painting possible even on materials with a little moisture remaining.

The phenalkamine curing agent according to the present invention is as shown in FIG. 3, and a hydroxyl group (-OH) acts as a catalyst in the curing reaction of epoxy and polyamine, so that general polyamine/polyamide without a hydroxyl group at room temperature as well as low temperature It exhibits a much faster curing performance than a curing agent, and also exhibits superior adhesion performance than a polyamine/polyamide curing agent by forming a hydrogen bond with a hydroxyl group on the surface of the surface-treated steel.

Since the benzene ring contains the benzene ring, which is the basis of the composition of the epoxy resin, the benzene ring has better compatibility with the epoxy resin than the other polyamine/polyamide curing agents, so the speed of uniform mixing with the epoxy resin is fast and Accordingly, the curing speed is fast, and the chemical resistance and water resistance are excellent due to the characteristic of the chemically stable benzene ring.

The aliphatic chain (-C15H27) expresses excellent water resistance because non-reactive aliphatic chains are basically hydrophobic, and thereby has excellent rust prevention performance. In addition, it contributes to the increase of production efficiency by shortening the process time.

As shown in FIGS. 3 to 5, the steel pipe coating apparatus 100 having an inner diameter short machine according to an embodiment of the present invention as a whole has a transfer means 4, a transfer cart 3, an inner and outer diameter shot machine 10, It can be seen that the preheating furnace 20, the cap mounting means, the outer surface coating unit, the cap removal and cooling unit, the inner diameter shorting device 80, the inner surface coating machine 110 and the like may be included.

First, the steel pipe 1 is put into the inclined seat 11 of the inner and outer diameter shot machine 10 by the transfer means 4 (S1),

For shot-blasting the outer surface of the steel pipe (1), an outer surface shot part having an outer surface injection part at the end and an inner surface shot part having an inner surface injection part at the end for shot-blasting the inner surface of the steel pipe (1) are carried out by a moving unit. ), the inner and outer shot blasting of the inner and outer surfaces of the steel pipe 1 by injecting shot balls is performed (S2).

Then, the steel pipe 1 on which the internal and external shot blasting has been completed by the internal and external diameter shot machine 10 is put into the preheating furnace 20 to be preheated to 350 to 380° C. (S3).

And before coating the outer surface, a cap for rotating the steel pipe is mounted on both ends of the preheated steel pipe (1) (S4).

And while it is mounted on the cap for rotating the steel pipe and rotates the steel pipe 1 based on the longitudinal central axis, the FBE coating part 40 performs powder epoxy coating on the outer surface of the steel pipe 1 (S5),

The adhesive coating part 50 applies an adhesive to the outer surface of the epoxy-coated steel pipe 1 (S6),

The PE (polyethylene) coating portion 60 is coated with PE on the outer surface of the steel pipe 1 coated with the adhesive (S7).

And remove the cap for rotating the steel pipe (S8),

The steel pipe 1 is cooled by spraying water therein (S9).

And the cooled steel pipe (1) is seated on the inclined base (81) of the inner diameter short device (80), and the transport boom device (90) is put into the inside of the steel pipe (1) by the bogie driving device (720). When the shot ball is rotated and sprayed by the shot ball supply device 900 provided at the end, shot blasting is performed (S10).

And in a state in which the inner surface shot blasting is completed steel pipe (1) is rotated by a rotating roller, a boom for epoxy spraying having an epoxy resin spraying nozzle containing a phenalkamine hardener at the end of the steel pipe (1) by the boom transfer bogie ) to coat the inner surface of the steel pipe 1 with epoxy containing phenalkamine (S11).

After performing the step (S10) of the inner surface shot blasting,

A loading step (S100) of loading the cooled steel pipe (1) onto the inclined base (81), and an unloading step (S110) of unloading the steel pipe (1) on which the internal shot blasting has been completed;

A short ball transfer belt is installed on one side of the transport boom that is connected to the bogie and reciprocates to transport the shot balls, and a short ball supply hole is formed in the shot ball supply tub with a number of rotating blades to rotate the transferred shot balls. A short ball supply step (S120) including a boom device for discharging transport, and

A short ball in the cap body having an inlet inner diameter shot ball cap in which the transport boom device is penetrated, a separation guide supporting the transport boom is adjustable in height, and the tip of the steel pipe is fixed, and a shot ball outlet is lowered. A cap step (S130) for an inlet-side inner-diameter shot including a cap device for an inlet-side inner-diameter shot in which an outlet is installed, and

The inner diameter short ball cap on the discharge side to which one end of the steel pipe is fixed is installed, and the center moving bar is installed on the reinforcing bar inside the cap body having the short ball discharge part on the lower side, and the fixing bar of the steel pipe support is installed on the protruding mounting base. A cap step (S140) for the discharge side inner diameter shot including a cap device for the discharge side inner diameter short shot to which is coupled;

A step of coating the inner surface in an inner surface coating machine that rotates the inner surface shot blasting steel pipe and coats an epoxy paint containing a curing agent containing an epoxy resin and a curing agent mixed with the epoxy resin (S11); It is to provide a manufacturing method characterized in that.

Hereinafter, FIG. 5 according to an embodiment of the present invention shows a plan view of an inner diameter shorting device 80 according to an embodiment of the present invention. And Figure 6 shows a front view of the inner diameter shorting device 80 according to an embodiment of the present invention. In addition, Figure 7 shows a side view of the inner diameter shorting device 80 according to the embodiment of the present invention.

5 to 7, the inner diameter short device 80 has an inclined base 81, a loading device 82, an unloading device 83, and a cap device 800 for inner diameter short inlet and outlet sides. , 850 ), dust collectors 840 and 870 , the shot ball discharge transfer unit 88 , the shot ball supply unit 881 , and the like can be seen to be included.

The loading device 82 loads the cooled steel pipe 1 onto the inclined base 81 , and the unloading device 83 is configured to unload the internal shot-blasting steel pipe 1 . The cap detachment means mounts a cap 805 for a short discharge side inner diameter shot on the discharge side end of the steel pipe 1 by the cap transfer unit 84, and a cap 855 for an inflow side inner diameter short shot on the inflow side end.

The cap devices 800 and 850 for the inlet and outlet inner diameter shorts are installed on both sides of the inclined base 81 to cover the inlet and outlet inner diameter short caps 805 and 855 on the steel pipe 1 . And, the shot ball transfer unit 88 is installed below the inclined base 81 and the shot ball discharge parts 808 and 858 to collect the shot balls obtained by shot blasting the inner diameter of the steel pipe 1, and a short ball storage unit ( 880) to be stored.

The transport boom unit 90 is to have a shot ball supply device 900 for supplying the shot ball with a constant rotational force is installed at one end.

Dust collectors 840 and 870 are respectively connected to the cap devices 800 and 850 for short internal diameter shots on the inlet side and the outlet side, and a shot ball storage unit 880 is installed in the cap device 850 for the inflow side internal diameter short shot. A ball supply unit 881 and a short ball recovery unit 882 are installed.

Hereinafter, according to an embodiment of the present invention, FIG. 8 is a front view of the transport boom device 90 among the inner diameter short devices of the present invention, and FIG. 9 is the main of the transport boom device 90 among the internal diameter short devices of the present invention. It is a front view of the part, Figure 10 is a plan view of a main part of the boom device for transport 90 of the inner diameter short device of the present invention, Figure 11 is a main part of the boom device 90 for transport of the inner diameter short device of the present invention For a side view, Figure 12 is a front cross-sectional view of the main part of the boom device for transport 90 of the inner diameter short device of the present invention, Figure 13 is a front view of the installation state for the right side of the boom device for transport 90 of the present invention it has been shown

The transport boom unit 90 is provided with a shot ball transport belt 92 biased in one direction so as to have a length equal to the overall length from the upper side of the transport boom 91, and the shot discharged through the shot ball supply unit 881 The ball is transported and supplied in a belt type, and a shot ball supply hopper 901 is installed at the tip of the shot ball transport belt 92 to be inclined downward, so that the transported shot balls are collected in the center and a shot ball supply device. (900) is to be discharged.

A frame 902 is installed at the tip of the boom stand 91 for transport in a "C" shape, and a short ball supply cylinder 905 is installed in the center thereof, and a rotary belt 904 through a hydraulic pump 903 from one side. The short ball supply hopper 901 is connected to the short ball supply barrel 905 to supply the shot balls, and at the same time, the shot ball supply holes 906 are formed at regular intervals to form the steel pipe (1). It is supplied to the inner diameter so that it is shot blasting, and rotating blades 907 are installed at regular intervals in the shot ball supply tube 905 to supply shot balls at a rotational speed while rotating to short-blast the inner diameter of the steel pipe 1 will be.

The rotary blades 907 are installed at regular intervals in the shot ball supply cylinder 905 to rotate at a high speed, and are formed in an "I" shape in a plane to supply the shot balls in the outer diameter direction by rotational force.

The bogie 710 to which the tip of the boom stand device 90 for transport is connected is installed so that the bogie driving device 720 is installed and coupled to the cap transfer unit 84 on the lower side to be reciprocally transported, and the upper side of the bogie 710 is hydraulic The device 920 is installed to supply hydraulic pressure to the hydraulic pump 903 to rotate and supply the shot ball with hydraulic pressure to perform shot blasting.

14 is a front view of the discharge-side inner-diameter short cap device 800 of the present invention according to a preferred embodiment of the present invention, FIG. 15 is a side view of the discharge-side inner-diameter short cap device 800 of the present invention, and FIG. 16 is A side view of the operating state of the discharge-side inner-diameter short cap device 800 of the present invention, FIG. 17 is a side view of the main part of the discharge-side inner-diameter short cap device 800 of the present invention, and FIG. 18 is the inlet side and the present invention A side view of the replacement cap of the cap device 800, 850 for a short inner diameter discharge side, FIG. 19 is a front view of the main part of the inlet side of the present invention, FIG. 20 is a short inner diameter shot of the discharge side and the inlet side of the present invention A side cross-sectional view of the main part of the caps 805 and 855 is shown.

The caps (805, 855) for inlet and outlet inner diameter shorts made of rubber material are formed in a circular shape to face each other on the cap devices 800 and 850 for inner diameter shorts installed at regular intervals and are fixed at the tip. The rings (806, 856) are fixed with fixing bolts (807, 857) to be installed so that the tip of the steel pipe (1) is in contact with the outside and is separated from the outside, and is reciprocally moved through the hydraulic cylinder (780) from the lower side, and the cap transfer part ( 84) to guide the reciprocating movement.

In the portion where the fixing rings 806 and 856 are installed, the size of the steel pipe 1 decreases and the central portion moves downward, and the finishing member 890 having a hole formed therein is exchanged to fit the size. ,

In the closing member 890, the fixing rings 806, 856, which are formed larger than the size of the steel pipe 1, are positioned and wrap the remaining parts to protect the open parts of the cap bodies 801, 851, Depending on the size of the steel pipe (1), it is replaced and installed so that both ends are blocked from the outside.

The discharge-side inner diameter shot cap device 800 is provided with a shot ball discharge unit 808 installed in a hopper shape at the lower side of the cap body 801 and is located above the shot ball transfer unit 88 to supply the shot ball. And, after the reinforcing bar 802 is installed in the horizontal and vertical directions, the center moving bar 803 is installed so as to be movable in the vertical direction, and the mounting base 804 protrudes in the direction of the discharge-side inner diameter short cap 805 .

The steel pipe pedestal 810 with the fixing rod 811 coupled to and separated from the installation table 804 is installed in a crisscross pattern to support the discharge shaft inner diameter short cap 805 to support the tip of the steel pipe 1 and to be fixed. , the center moving shaft 809 is installed above the center of the center moving bar 803 so that the height is adjusted by the reinforcing bar 802 .

The central moving shaft 809 is installed to adjust the height through the height adjustment chain 820 of the height adjustment cylinder 821 installed in the vertical direction on the outside, and the dust collector 840 through the dust discharge part 860 on the upper side. ) and discharging the dust generated from the cap body 801 to the outside for treatment.

The cap device 850 for the inlet-side inner diameter shot is provided with a shot ball discharge part 858 installed in a hopper shape on the lower side of the cap body 851 and is located above the shot ball transfer part 88 to supply the shot ball. And, to allow the transfer boom 91 to pass through, the boom guide 700 through which the transfer boom 91 is penetrated to one side is installed.

The boom guide 700 is provided with a boom guide part 703 on the lower side to support the movement from the lower side of the transport boom 91, and the boom height adjustment screw 702 is installed from the center to the upper side. It is installed so that the height can be adjusted.

The inlet-side inner diameter shot cap device 850 is provided with a dust discharge unit 860 on the upper side to discharge the dust to the outside by connection with an external dust collector 870, and the shot ball supply device 900 has a short shot. The ball storage unit 880 is installed so that the shot ball supply unit 881 for supplying the shot ball to the upper side of the shot ball transfer belt 92 is connected, and the shot ball discharged from the shot ball transfer unit 88 at the lower side is transferred to the upper side. A shot ball recovery unit 882 that transports to the evaporator and stores it in the shot ball storage unit 880 to be reused is installed.

The mixing ratio of the main agent having an epoxy resin and the curing agent containing phenalkamine according to an embodiment of the present invention, which is coated after shot blasting the inner diameter of the steel pipe 1 using the inner diameter shot device 80, is 4:1. In more detail, the main agent and the curing agent are preferably mixed in a volume ratio of 3 to 5: 0.5 to 1.5.

In addition, the subject according to an embodiment of the present invention is configured to include a bisphenol F-type epoxy resin, urea resin, pigment, and solvent.

The specific composition ratio is composed of 15 to 30% by weight of bisphenol F-type epoxy resin, 1 to 5% by weight of urea resin, 45 to 80% by weight of pigment, and 11 to 35% by weight of solvent, based on the total main weight.

And the pigment according to an embodiment of the present invention comprises 10 to 15% by weight of titanium dioxide as a color pigment, 0.02 to 0.1% by weight of black pigment?, 20 to 40% by weight of talc as a filler pigment And it can be seen that it is composed of 15 to 30% by weight of silica powder.

In addition, 10 to 30% by weight of xylene and 1 to 5% by weight of propylene glycol methyl ether are included as a solvent.

And it can be seen that the epoxy curing agent according to an embodiment of the present invention is composed of 80 to 89% by weight of phenalkamine, 10 to 15% by weight of xylene as a solvent, and 1 to 5% by weight of a curing accelerator.

In the present invention, both ends of the steel pipe (1) for the purpose of cleaning the inner diameter before coating the epoxy paint to which phenalkamine is applied when the inner diameter is coated in the process of coating the inner and outer diameters of the steel pipe (1). After installing a cap using a closing member 890 according to the size of the steel pipe (1), a short ball is supplied to the inner diameter of the steel pipe (1) by a strong pressure using a hydraulic device (920) and a hydraulic pump (903). The effect of accurately coating the epoxy paint to which phenalkamine is applied by making the coating of the polyamine two-component epoxy resin paint to which the curing agent containing phenalkamine is applied is made immediately after cleaning is performed, and the (salt) water resistance and resistance It has excellent chemical properties as well as abrasion resistance, and it is possible to perform coating on various surfaces, as well as painting at a low temperature such as in winter, providing the effect of working without seasonal influence.

According to the epoxy paint to which phenalkamine is applied according to an embodiment of the present invention, since a phenalkamine curing agent is applied, the hydrophobicity characteristic of phenalkamine molecules is minimized by contact with water molecules to enable painting, Excellent steel pipe coating effect through quick-drying through excellent low-temperature curing performance, coating is performed immediately after cleaning the inner diameter of the steel pipe, so it has excellent adhesion, salt water resistance, rust prevention and excellent water resistance, and hardening and drying at low temperature It is a thick film type and provides a long fiber that can be painted after a simple surface treatment.

According to the steel pipe according to the embodiment of the present invention, the process for installing the cap is performed quickly and conveniently from both sides according to the size, and dust and contaminants generated in the working process after performing shot blasting by supplying shot balls are It is removed, the shot balls are recovered and reused, and the epoxy paint applied with phenalkamine is coated immediately after shot blasting, thereby providing various advantages by coating the inner diameter in a state that is not contaminated or corroded.

According to the steel pipe according to the embodiment of the present invention, the cap is quickly detached and attached according to the size, and the separation from the outside is accurate to prevent contamination, and the exchange for the installation of the cap and both sides of the steel pipe according to the size of the steel pipe There is an advantage in providing a steel pipe coating device in which the tip fixing and support are strong, and the internal diameter shot blasting of the steel pipe is performed quickly and accurately.

1: steel pipe 4: transport means
10: inner and outer diameter short circuit 20: preheating furnace
40: FBE coating part 50: adhesive coating part
60: PE coating part 80: inner diameter short device
81: inclined base 82: loading device
83: unloading device 84: cap transfer unit
88: shot ball transfer unit 90: boom unit for transfer
91: boom for transfer 92: short ball transfer belt
700: boom guide 701: guide shaft
702: boom height adjustment screw 703: boom guide part
710: bogie 720: bogie driving device
780: hydraulic cylinder 800: discharge side inner diameter short cap device
801, 851: cap body 802: reinforcing bar
803: center moving table 804: mounting table
805: discharge side inner diameter short cap 806, 856: fixing ring
807, 857: fixing bolt 808, 858: short ball discharge part
809: center moving axis 810: steel pipe support
811: fixture 820: height adjustment chain
830: dust discharge part 840, 870: dust collector
850: cap device for short inlet inner diameter 855: cap for inlet inner diameter short
860: dust discharge unit 880: short ball storage unit
881: short ball supply unit 882: short ball recovery unit
890: finishing member 900: short ball supply device
901: short ball supply hopper 902: frame
903: hydraulic pump 904: rotating belt
905: short ball supply barrel 906: short ball supply hole
907: rotary blade 920: hydraulic device

Claims (11)

The steel pipe (1) is put into the inclined mounting table of the inner and outer diameter shot machine by means of transport, and the outer surface shot part having an outer surface spray part at the end and the inner surface of the steel pipe in order to shot-blast the outer surface of the steel pipe (1). An inner and outer shot blasting step of injecting a shot ball into the inner and outer surfaces of the steel pipe by entering an inner shot part having an inner surface spraying part at the end in the longitudinal direction by a moving unit for shot blasting; preheating to 350 ~ 380 ℃ by putting the inner and outer surface shot blasting finished steel pipe by the inner and outer diameter shot machine into a preheating furnace; mounting caps for rotating the steel pipe to both ends of the preheated steel pipe; While being mounted on the cap for rotating the steel pipe and rotating the steel pipe based on the longitudinal central axis, the FBE coating part performs powder epoxy coating on the outer surface of the steel pipe, and the adhesive coating part coats the adhesive on the outer surface of the epoxy-coated steel pipe, , an outer surface coating step of coating PE on the outer surface of the steel pipe coated with an adhesive by the PE coating unit; removing the cap for rotating the steel pipe, and cooling the steel pipe by spraying water therein; The cooled steel pipe is seated on the inclined base of the inner diameter shot machine, the transport boom is put into the inside of the steel pipe by the transfer unit, and the shot ball is rotated and sprayed by the impeller spraying unit provided at the end to perform internal shot blasting. proceeding; And in a state in which the inner surface shot blasting is completed, the steel pipe is rotated by the rotating roller, the epoxy spraying transfer boom having an epoxy spray nozzle at the end is put into the steel tube by the boom transfer bogie, and the inner surface of the steel tube is coated with epoxy step; Coating the inner surface in an inner surface coating machine that rotates the inner surface shot blasting finished steel pipe and coats an epoxy paint including a curing agent having phenalkamine mixed with a main material and a main material having an epoxy resin; including;
The step of performing the inner short blasting is,
A loading step of loading the cooled steel pipe to the inclined base, and an unloading step of unloading the internal shot blasting finished steel pipe,
A short ball transfer belt is installed on one side of the transport boom that is connected to the bogie and moves reciprocally, and the shot balls are supplied to a short ball supply box equipped with a plurality of rotary blades, and then discharged from the short ball supply hole, and the plurality of rotary blades rotate. A short ball supply step comprising a boom device for transport discharging to the inner diameter of the steel pipe;
A cap device for an inlet inner diameter shot consisting of a cap body through which the transport boom device penetrates, the boom guide supporting the transport boom on the lower side is height-adjustable, and a cap body having a shot ball discharge part below the inlet internal diameter short cap. A cap step for an inlet-side inner diameter short comprising:
A discharge-side inner-diameter short cap to which one end of the steel pipe is fixed is installed, and a longitudinally movable center moving bar is installed on the reinforcing bar inside the cap body having a short ball discharge part downward, and protrudes in the direction of the discharge-side inner diameter short cap A discharge-side inner-diameter short cap step comprising a cap device for a discharge-side inner-diameter shot consisting of a steel pipe pedestal having a fixing rod coupled to and separated from the installed installation table; A method of manufacturing a steel pipe to which phenalkamine epoxy paint is applied after using an inner diameter short group, characterized in that it comprises a.
The method of claim 1,
The boom for transport of the short ball supply step has a short ball transport belt installed on one side connected to the bogie, and the shot ball supply barrel receiving the shot ball from the shot ball supply hopper installed at the tip of the shot ball transport belt is a rotating belt. It is connected to the hydraulic pump through the tubing, and when the shot ball supply holes are formed at regular intervals in the shot ball supply trough and the shot balls are supplied, the rotary blade installed in the shot ball supply tub rotates to supply the shot balls to the inner diameter of the steel pipe and short A method of manufacturing a steel pipe to which phenalkamine epoxy paint is applied after using an inner diameter shot machine, characterized in that it includes a shot ball supply device for blasting.
The method of claim 1,
In the cap device for the discharge side inner diameter short cap step of the discharge side inner diameter short cap step, the discharge side inner diameter short cap to which one end of the steel pipe is fixed is fixed to the cap body with a fixing bolt through a fixing ring, and inside the cap body A steel pipe having a center moving bar that is installed in the horizontal and vertical directions, the height is adjusted, a center moving shaft is installed on the upper side, and a mounting base formed in the front, and a fixing bar fixed to the center moving bar in a crisscross shape. A method of manufacturing a steel pipe to which phenalkamine epoxy paint is applied after using an inner-diameter short machine that includes fixing the pedestal to the inside of the inlet-side inner-diameter short cap.
The method of claim 1,
The cap device for the inlet inner diameter short cap step of the inlet inner diameter short cap step is fixed to the cap body with a fixing bolt through a fixing ring by fixing one end of the steel pipe, and the boom rod is installed on the lower side of the boom guide installed inside the cap body. A method of manufacturing a steel pipe to which phenalkamine epoxy paint is applied after using an inner diameter short machine that includes installing a guide part to support movement from the lower side of the transport boom, and installing a boom height adjusting screw from the center to the upper side to adjust the height .
The method of claim 1,
The cap device for the inlet and outlet inner diameter shorts of the cap step for the inlet and outlet inner diameter shorts has a hole in which the steel pipe is fixed, and installs caps for the inlet and outlet inner diameter shorts according to the size of the steel pipe. A method for manufacturing a steel pipe to which phenalkamine epoxy paint is applied after using an inner diameter short machine, characterized in that it includes a finishing member that forms a ring and is fixed with a fixing bolt.
The method of claim 1,
In the transport boom device of the short ball supply step, a shot ball transport belt is installed on the upper side of the transport boom to transport and supply the shot balls discharged through the shot ball supply unit in a belt type, and the tip of the shot ball transport belt has a lower side. A shot ball supply hopper is installed inclined toward the direction to collect the transported shot balls in the center so that they are discharged to the short ball supply device,
A frame is installed at the tip of the transport boom and rotated by a rotary belt through a hydraulic pump from one side of the short ball supply trough in the center, and a short ball supply hopper is connected to the short ball supply tub to supply the shot balls at a regular interval. A shot ball supply hole is formed in the hole to supply the inner diameter of the steel pipe at a rotational speed so that it is shot blasting.
A method of manufacturing a steel pipe in which a phenalkamine epoxy paint is applied after using an inner diameter shorting machine, comprising the step of supplying shot balls while rotating and rotating blades installed at regular intervals in the shot ball supply cylinder to shot blasting the inner diameter of the steel pipe.
The method of claim 1,
In the cap device for the inlet side and the discharge side inner diameter shot of the cap step for the inlet and outlet side inner diameter shorts, the dust outlet is connected to the cap body on the upper side, and the dust outlet is connected to the dust collector. A method of manufacturing steel pipe with phenalkamine epoxy paint applied afterwards.
The method of claim 1,
In the step of coating the inner surface, the epoxy paint to be coated using an inner surface coater includes: a main material having an epoxy resin; and a curing agent mixed with the subject and having phenalkamine;
The subject and the curing agent are mixed in a volume ratio of 3 to 5: 0.5 to 1.5,
The subject is
Based on the total weight of the main agent, 15 to 30% by weight of bisphenol F-type epoxy resin, 1 to 5% by weight of urea resin, 10 to 15% by weight of titanium dioxide as a color pigment and 0.02 to 0.1% by weight of black pigment, talc as a filler pigment 20 to 40% by weight and 15 to 30% by weight of silica powder, and 10 to 30% by weight of xylene and 1 to 5% by weight of propylene glycol methyl ether as a solvent,
The curing agent,
After using an inner diameter short group comprising 80 to 89% by weight of phenalkamine, 10 to 15% by weight of xylene as a solvent, and 1 to 5% by weight of a curing accelerator based on the total weight of the curing agent, a phenalkamine epoxy paint is applied. Applied steel pipe manufacturing method.
delete a bogie on which a steel pipe to be coated is seated, a rotating roller for rotating the steel pipe based on a longitudinal central axis, and transporting the steel pipe along the process flow by a conveying means; An outer surface shot part for shot blasting the outer surface of the steel pipe, an inner surface shot part for shot blasting the inner surface of the steel pipe, the outer surface short part and the inner surface an inner and outer diameter shot machine for entering a shot part in the longitudinal direction of the steel pipe, and recovering and transporting shot balls from the steel pipe; a preheating furnace for preheating the inner and outer surface shot blasting of the finished steel pipe by the inner and outer diameter shot machine; cap mounting means for mounting caps for rotating the steel pipe to both ends of the preheated steel pipe; An FBE coating part mounted on the cap for rotating the steel pipe to rotate the steel pipe based on the central axis in the longitudinal direction and powder epoxy coating on the outer surface of the steel pipe, and an adhesive coating for applying an adhesive to the outer surface of the epoxy-coated steel pipe an outer coating part having a PE coating part sequentially coating polyethylene on the external surface of the steel pipe coated with an adhesive; a cap removal and cooling unit to which the outer-coated steel pipe is transferred to remove the cap for rotating the steel pipe, and to spray water therein to cool the steel pipe; It has a base on which the cooled steel pipe is seated in an inclined shape, a transport boom that is injected into the inside of the steel pipe by a moving unit and rotates a shot ball by an impeller sprayer provided at the end to perform internal shot blasting. inner diameter shorting device; And in a state in which the inner surface shot blasting is completed steel pipe is rotated by the rotating roller, an epoxy spraying transfer boom having an epoxy spray nozzle at the end is put into the steel tube by the boom transfer bogie to coat the inner surface of the steel tube inner coating machine; an inner surface coating machine for coating an epoxy paint including a curing agent having phenalkamine mixed with a main material and a main material having an epoxy resin while rotating a steel pipe having inner diameter shot blasting completed; including;
The inner diameter short device,
a loading device for loading the cooled steel pipe onto the inclined base; an unloading device for unloading the internal shot blasting finished steel pipe;
A short ball transfer belt is installed on one side of the transport boom that is connected to the bogie and moves reciprocally, supplying the shot balls to the short ball supply trough equipped with a plurality of rotary blades, and then rotating the plurality of rotary blades discharged from the short ball supply hole. and a transport boom device equipped with a short ball supply device that discharges
A cap device for an inlet inner diameter shot through which the boom device for transport passes and a boom guide for supporting the boom for transport is installed so as to be adjustable in height, and comprising a cap body having a short ball discharge part under the cap for an inlet internal diameter shot;
A discharge-side inner-diameter short cap to which one end of the steel pipe is fixed is installed, and a longitudinally movable center moving bar is installed on the reinforcing bar inside the cap body having a short ball discharge part downward, and protrudes in the direction of the discharge-side inner diameter short cap a cap device for a short internal diameter discharge side consisting of a steel pipe pedestal installed with a fixing rod that is coupled to and separated from the installed installation table; A steel pipe coating device to which phenalkamine epoxy paint is applied after using an inner diameter short machine, characterized in that it comprises a.
11. The method of claim 10,
The epoxy paint to be coated using the inner surface coating machine, the main material having an epoxy resin; and a curing agent mixed with the main agent and having phenalkamine, wherein the main agent and the curing agent are mixed in a volume ratio of 3 to 5: 0.5 to 1.5,
The subject is
Based on the total weight of the main agent, 15 to 30% by weight of bisphenol F-type epoxy resin, 1 to 5% by weight of urea resin, 10 to 15% by weight of titanium dioxide as a color pigment and 0.02 to 0.1% by weight of black pigment, talc as a filler pigment 20 to 40% by weight and 15 to 30% by weight of silica powder, and 10 to 30% by weight of xylene and 1 to 5% by weight of propylene glycol methyl ether as a solvent,
The curing agent,
After using an inner diameter short group comprising 80 to 89% by weight of phenalkamine, 10 to 15% by weight of xylene as a solvent, and 1 to 5% by weight of a curing accelerator based on the total weight of the curing agent, a phenalkamine epoxy paint is applied. Applied steel pipe coating device.

Images