JPH072986B2 - Metal spraying equipment for pipes - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a metal spraying device for a pipe.

2. Description of the Related Art It has been conventionally known that a metal zinc film is formed on the outer surface of an iron pipe to prevent rust. This is because zinc forms a rust preventive coating made of basic zinc carbonate and further serves as a sacrificial anode. As a film forming method, there is a so-called thermal spraying method in which a metallic zinc material is melted in a hot atmosphere at the same time as it is thermally melted. For an iron pipe, for example, an arc spraying method is used. Specifically, two zinc wires are supplied to a spray gun designed so that the two zinc wires intersect at the tip, and the two zinc wires are energized to cause arc discharge between the zinc wires, The zinc wire itself is melted by the heat generated at that time, and a high-speed air stream is jetted from behind the melting point to make it fine and adhere it to the iron pipe which is the object to be irradiated.

A conventional metal-zinc melting device is provided with a pair of clamp carriages that clamp both ends of an iron pipe from both sides so that it can move freely in the longitudinal direction of the pipe.The clamp carriages move the iron pipe while it is still clamped. The metallic zinc is sprayed and adhered to the outer surface of the iron pipe by a spray gun provided in the thermal spray chamber while passing the iron pipe through the thermal spray chamber arranged at a predetermined position.

SUMMARY OF THE INVENTION However, according to the above-described conventional metal-zinc melting apparatus, since the metal pipe is sprayed over the entire length of the iron pipe while the iron pipe is supported from both sides by the clamp shaft provided in the clamp carriage, There is a problem that metallic zinc adheres to and accumulates on the outer surface of the iron pipe clamp portion, resulting in a very large thickness. Further, once attached in a circumferential shape, it becomes a metal tube and becomes difficult to remove.

The present invention solves the above problems, and an object of the present invention is to provide a metal spraying apparatus for a pipe, which can easily remove metal zinc attached to the clamp shaft.

Means for Solving the Problems In order to solve the above problems, a metal spraying apparatus for a pipe of the present invention is a spraying tool for spraying a metal disposed in a spraying chamber partitioned from the outside, and in the longitudinal direction of the pipe. A pair of clamp devices which are movable along the same and clamped from both ends to be inserted into the thermal spray chamber while rotating, a brush planted on a clamp shaft of the clamp device, and a clamp shaft and a pipe in the thermal spray chamber. And a scraper which is disposed at a position where the brush is inserted to remove the metal powder attached to the brush.

Operation With the above configuration, when performing the thermal spraying work of metallic zinc, the iron pipe is clamped by the clamp device and is inserted and passed through the thermal spray chamber while being rotated. The metallic zinc is sprayed toward the outer surface of the iron pipe by the thermal spraying tool from the time when one end of the iron pipe is inserted into the thermal spraying chamber until the other end passes. At this time, since the metallic zinc coating is surely formed over the entire length of the iron pipe, the metallic zinc is also sprayed and adhered to the tip portion of the clamp shaft near the iron pipe. However, since the brush is planted at this location, the metallic zinc adheres to the tip of the brush in a dot shape and is easily removed by the scraper provided at the opening of the thermal spray chamber.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an iron pipe, and 2A and 2B are clamp trucks that clamp the iron pipe 1 from both ends. Clamp trucks 2A and 2B
Is allowed to travel on the rail 3. Clamp trolley 2
A and 2B are clamp shafts that come into contact with the end surface of the iron pipe 1 and clamp it.
The iron pipe 1 has 4A and 4B, and the iron pipe 1 is rotated via the clamp shafts 4A and 4B by a driving device (not shown) provided in the clamp carriages 2A and 2B. A thermal spray chamber 6 partitioned from the outside is arranged at an appropriate position on the rail 3, and the thermal spray chamber 6 is provided with a pair of thermal spray guns 5 and is provided with inlet and outlet openings 6a and 6b on the left and right. There is. Each spray gun 5 has a zinc wire 8 drawn from a zinc wire drum 7.
Are supplied respectively, and metallic zinc is sprayed from each spray gun 5. Here, Fig. 2 (a) and (b)
As also shown in FIG. 3, a brush 9 is planted on the outer periphery of the tip end portions of the clamp shafts 4A, 4B, and a scraper 10 for scraping off the deposits on the brush 9 is provided at the inlet / outlet opening 6a of the thermal spray chamber 6, respectively. It is installed. A dust collector 11 is connected to the thermal spray chamber 6. Further, the thermal spraying chamber 6 is preliminarily provided with the iron pipe 1
The iron pipe 1 is arranged in the vicinity of an undercoating apparatus that activates the base material and enhances the adhesiveness of metallic zinc, and the iron tube 1 is subjected to undercoating before the thermal spraying operation.

In the above configuration, when performing the spraying work of metallic zinc,
For example, the clamp carriage 2A is moved in the direction a from the position shown in FIG. 1 and the iron pipe 1 is clamped by the clamp shafts 4A and 4B. Then, while the iron pipe 1 is rotated via the clamp shafts 4A, 4B by the drive of the drive device, both clamp carriages 2A, 2B are made to travel in the direction a while the iron pipe 1 is being clamped, so that the iron pipe 1 is inside the spray chamber 6. Insert and pass. Metal zinc is sprayed from the spray gun 5 toward the outer surface of the iron pipe 1 from one end of the iron pipe 1 inserted into the thermal spray chamber 6 until the other end has passed. At this time, in order to reliably form the metallic zinc coating over the entire length of the iron pipe 1, the clamp shaft 4 near the iron pipe 1
Metallic zinc is also sprayed and adheres to the tip portions of A and 4B, but since the brush 9 is implanted in this portion, the metal zinc adheres to the tip of the brush 9 in a dot shape. The metallic zinc is easily attached because it is attached in a dot shape, and is easily removed by the scraper 10 provided at the inlet / outlet opening 6a of the thermal spray chamber 6. The removed metal zinc powder is dust-collected in the thermal spraying chamber 6, and is efficiently delivered to a predetermined location by the dust collector 11.

The scraper 10 is made of iron, plastic, or the like, and may have a flat plate shape, a comb shape, or a brush shape. The brush 9 has a wire diameter, a density, and a bristle (wire length). The brush 9 is not easily worn by the scraper 10 and has a long life.

As described above, according to the present invention, a brush is planted on the clamp shaft for clamping the pipe, and the metal powder attached to the brush is removed by the scraper provided in the thermal spray chamber. The adhered metal powder can be easily removed for each cycle of thermal spraying work to efficiently collect dust. Further, even when compared with a case where a brush is not provided on the clamp shaft and a brush is provided at the opening of the spray chamber to remove the sprayed metal adhering to the clamp shaft from the outside, the structure of the present invention According to the method, since the sprayed metal adheres to the brush in a state where it can be easily removed, the metal can be removed extremely easily and without resistance.

[Brief description of drawings]

FIG. 1 is a front view of a metal spraying apparatus according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are a sectional view and a side view of a main part of a spraying chamber of the metal spraying apparatus. 1 ... Iron tube, 2A, 2B ... Clamping trolley, 4A, 4B ... Clamping shaft, 5 ... Thermal spray gun, 6 ... Thermal spray chamber, 8 ... Zinc wire,
9 …… Brush, 10 …… Scraper.

Claims (1)

[Claims] 1. A metal spraying device for spraying a metal onto the outer surface of the pipe, the spraying tool being provided in a spraying chamber partitioned from the outside to spray the metal, and along the longitudinal direction of the pipe. A pair of clamp devices that are movable and that insert into the thermal spray chamber while clamping and rotating the pipe from both ends, a brush planted on the clamp shaft of the clamp device, and a clamp shaft and pipe in the thermal spray chamber. And a scraper for removing the metal powder adhering to the brush, the metal spraying apparatus for pipes.