JPS6142368A - Apparatus for lining outer surface of metal pipe - Google Patents

Abstract

PURPOSE:To form a lining film with a uniform thickness, by mounting a small fluidized tank enabled in the security of constant quantity to bottom outer surface part of a predetermined metal pipe in a freely reciprocally movable manner. CONSTITUTION:A relatively small fluidized tank 3 is provided on the truck 1 moving on a base rail 14 and a polyethylene resin powder 4 is received in said tank 3. Then, a turning roll is rotated to rotate a steel pipe 8. At the same time, a driving apparatus 2 is started and the truck 1 is moved along the axial line of the steel pipe 8 and air is injected in the fluidized tank 3 to operate the fluidized tank 3. As a result, the scattered and levitated polyethylene resin powder is fused to the outer surface of the steel pipe 8 to form a plastic film. By this method, a predetermined uniform film is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for lining the outer surface of a metal tube with plastic powder.

As is well known, a plastic fluid dipping method is known as one of the methods for lining metal surfaces with plastic powder. In this method, a heated metal object is coated with synthetic resin powder, and the powder is fused onto the metal surface to form a protective film.

The present invention relates to an apparatus for lining the outer surface of a metal tube using such a plastic fluid dipping method.

rConventional technology and its problems] Conventionally, a metal tube is heated in advance and placed horizontally in a fluidized tank.
A device for lining the outer surface of a metal tube using a plastic flow dipping method in which resin powder is fused to the surface of the tube while rotating the tube is known (for example, Japanese Patent Laid-Open No. 56-953
(Explained in Publication No. 59). However, as stated in the above-mentioned publication, the conventional external lining equipment for metal pipes is particularly large in size when lining large-diameter and long metal pipes, and resin powder is scattered in the workplace. There was the inconvenience of doing so. Therefore, in the above-mentioned publication, the synthetic resin powder contained in the hopper is dropped onto the surface of the metal tube along with the air blown down by the hopper, and the synthetic resin powder is dropped onto the surface of the metal tube together with the air. We propose a method of lining the outer surface while moving the proar in the direction of the tube axis.

However, in such proposed inning method,
Synthesis...Although the scattering of fat powder can be prevented, synthetic resin powder falls with the air blown down from the blower.
There was a risk that the powder would have shading, and that the lining on the surface of the metal tube would become non-uniform.

[Means for solving problems]

Therefore, the present invention was created in an attempt to eliminate these inconveniences of conventional metal pipe lining devices all at once.The present invention is a small-sized fluidized tank that is capable of ensuring a fixed amount of fluid, and is reciprocated at the bottom of the outer surface of a predetermined metal pipe. This relates to a movably equipped outer surface lining device for metal tubes.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be explained in detail below with reference to embodiments shown in the accompanying drawings.

Fig. 1 is a side view of an embodiment of the present invention, and Fig. 2 is A of Fig. 1.
-A sectional view and FIG. 3 are side views of another embodiment. In these illustrated devices, a steel pipe 8 heated in advance by high frequency heating or a burner, etc.
It is placed horizontally on a turning roll 7.7 and is capable of rotating. The diameter of the cough steel pipe 8 can be about 400 m or more and about 3 m, and the length can be up to about 12 m. Next, steel pipe 8
The plastic powder fluidization immersion device installed at the bottom of the outside has the following configuration. In other words, base rail 14.1
A relatively small fluidized tank 3 is provided on a trolley 1 that moves on a trolley 1, and the fluidized tank 3 accommodates polyethylene resin powder 4 on a filter cloth 6. An end of an air pipe 5 is provided in the bottom chamber of the fluidization tank 3 so as to be able to blow upwardly, and the air pipe 5 communicates with an air tank or blower (not shown).

The fluidizing tank 3 has inclined plates 14 and 14 facing each other so as to hold the outer surface of the steel pipe 8 to be lined. The inclined plate 14.
14 is for the outer surface of the steel pipe 8, in order to be as close as possible,
The angle of inclination can be adjusted depending on the diameter of the steel pipe 8. Note that the inclined plate may be a curved plate. A hopper 9 is attached to the upper end of one of the slanted plates 14, and an adjustable slit I is attached to the hopper 9.
Flow the consumed polyethylene resin powder from O $11
3 to ensure that the amount of powder in the fluidized tank 3 is always constant. A box-shaped reservoir 11, ]l is installed in the axial direction of the steel pipe 8 in the fluidization tank 3, and #I! ! The spilled polyethylene resin powder 4 is temporarily stored to prevent it from scattering into the workplace. The truck 1 also includes a drive device 2 (
motor) is mounted and the trolley 1 is run. 15.15 shows a moving platform on which a turning roll 7.7 is placed.

Since the present embodiment is configured as described above, the turning roll 7 is rotated by a drive device (not shown), and the steel pipe 8 is rotated.At the same time, by starting the drive device 2, the trolley 1 is moved along the axis of the steel pipe 8. At the same time, air is injected into the fluidized tank 3 from the air pipe 5 to operate the fluidized tank 3. As a result, the polyethylene resin powder scattered and suspended on the outer surface of the rotating steel pipe 8 is fused and A plastic film is formed. Here, since the rotation of the steel pipe 8 and the moving speed of the trolley 1 are synchronized, the thickness of the lining film fused to the outer surface of the steel pipe 8 can be formed as specified. In the case of the example, by reciprocating the cart 1 several times, it is possible to automatically obtain a predetermined lining film thickness of 1.n or more, so that the film thickness becomes more uniform. Note that the polyethylene resin powder scattered within the reservoir 11 is fused to the outer surface of the steel pipe in the vicinity of the flange 13.

Next, in the case of a one-sided flange steel pipe 8° as shown in FIG.
．． 7 and perform the lining work.

In the above embodiments, the covering pipe was explained as a steel pipe, and the synthetic resin powder was explained as polyethylene powder, but the present invention is not limited to these, but can also be applied to stainless steel pipes, vinyl chloride resin powder, epoxy resin powder, etc. It is applicable, and a test example of this example is shown below.

Since the present invention employs the configuration described above, it has the following effects.

〔Effect of the invention〕

Since the lining film is formed while reciprocating a small fluidized tank, not only does the thickness of the lining film become uniform, but it is especially easy to synchronize the moving speed of the fluidized tank and the rotation of the metal tube. By controlling this, a predetermined uniform film can be formed. In addition, since the fluidized tank is small, the drawback of the plastic fluidized dipping method in which the resin powder is scattered in the workplace can be avoided as much as possible, and as a result, the amount of lost powder can be reduced. In addition, since the fluidized tank is connected with a resin powder supply member, the amount of resin powder in the fluidized tank can be kept constant, and the concentration of floating powder can also be kept constant, so a uniform lining film can be achieved. Can be formed.

Note that the present invention can be carried out by heating the tube once in combination with other methods of lining the inner surface with synthetic resin.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention, and Fig. 2 is Fig. 1A-
A sectional view and FIG. 3 show a side view of another embodiment. 3... Fluidization tank, 5... Air piping, 9... Hopper, 14... (1) 1 swash plate

Claims (2)

[Claims] (1) A small fluidized tank capable of containing a fixed amount of synthetic resin powder is installed at the bottom of the outer surface of a heated, lined metal pipe that can be horizontally mounted and rotated, and the bottom of the fluidized tank is A metal metal, characterized in that an air pipe is installed in the fluid tank, tube-holding plates are extended on both sides of the fluid tank corresponding to the pipe rotation direction, and a lining film is formed by reciprocating the fluid tank. External lining device for pipes. (2) The apparatus for lining the outer surface of a metal tube according to claim (1), wherein a synthetic resin powder supply member is connected to one end of one tube holding plate extending from the fluidizing tank. .