JPS598185B2 - Integrated processing equipment for shot blasting and metal spraying of wrapper tubes, funnel tubes, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal thermal spraying device such as a lapper tube or a road tube, and more specifically, the present invention relates to a metal thermal spraying device such as a lapper tube or a road tube. The present invention relates to a metal thermal spraying device that can thermally spray a metal such as aluminum or zinc for corrosion prevention and simultaneously perform surface treatment, and that can provide a uniform thermally sprayed coating with high adhesion.

In recent years, with the progress of the economy, the scale of public works projects, etc. has become larger, and accordingly, steel structures such as steel pipes are also becoming larger.

When these steel structures require anti-corrosion treatment, aluminum or zinc is usually sprayed onto the outer surface of the steel structure. This thermal spraying of aluminum, zinc, etc. is often applied to objects with relatively small diameters, and this process is usually performed manually. On the other hand, as mentioned above, when the steel structure to be thermally sprayed becomes larger, especially when the diameter becomes larger and the treatment area becomes larger, metal thermal spraying is generally done manually by blasting → base thermal spraying - aluminum or zinc. Since the process is advanced each time thermal spraying is completed, there are many time differences between each process, and the time required to complete the work is the sum of each process, making it extremely long. It is also possible to carry out each process in parallel using human labor tactics, but in the case of manual labor, there are various essential elements, and JIS
It is impossible to obtain a thermal spray coating as described in H9301, JISH9300, etc., and it requires a large number of workers and many days. In addition, the base material of the steel structure is activated immediately after blasting, and the degree of bonding with the thermal spray particles is extremely good. However, in cases where the treated area is large as described above, it is often not possible for the thermal spray coating to cover the entire substrate within the activation time for a good degree of bonding, and the adhesion between the substrate and the thermal spray coating is impaired. Also,
When metal spraying is carried out manually as described above, individual differences among workers are added, resulting in variations in film thickness and lack of uniformity, which also makes it difficult to obtain a film thickness within an allowable error range. The purpose of the present invention is to solve the above-mentioned drawbacks, and specifically, it is possible to thermally spray metal immediately after blasting, and the adhesion between the base material of the steel structure and the thermally sprayed particles of aluminum or zinc is extremely good.
Furthermore, we propose an integrated processing device that can perform thermal spraying automatically and contribute to a significant reduction in the number of workers.

That is, the integrated processing apparatus according to the present invention vertically holds a load-shaped or truss-shaped bell-platform copper structure and rotates it continuously around its vertical axis. A blasting device and a metal spraying device are provided at intervals along the direction, and the blasting device is provided with a blasting nozzle that moves up and down over the height of the structure, and a belt conveyor that collects and discharges the injected abrasive material. The metal thermal spraying apparatus is characterized in that the metal spraying apparatus is provided with thermal spray guns that move up and down over the height of the structure and perform base thermal spraying and metal thermal spraying.

Therefore, when metal spraying is performed using the apparatus according to the present invention, the thickness of the sprayed coating becomes uniform, and it is possible to spray metals on steel wire, aluminum, zinc, etc.
It is economical because it consumes less wire, gas, etc.

In addition, thermal spraying in this manner reduces labor, speeds up each process, and dramatically improves the quality of the sprayed coating. Hereinafter, the present invention will be explained in detail with reference to the drawings.

First, FIG. 1 is a plan view of a metal thermal spraying apparatus according to one embodiment of the present invention, and FIG. 2 is a longitudinal sectional view taken along the line A-A of the apparatus, and shows, for example, a load-shaped steel to be treated. The structure 4 is usually placed on a height adjustment table 3 with a top plate 4a or the like interposed therebetween, and the height adjustment table 3 is rotatably supported on the turntable 2.

In this way, the height adjustment table 3 and the turntable 2 usually constitute a rotating device, but the rotating device does not necessarily have to be configured in this way. It can be configured in any way if possible.
In addition, when a rotating device is constructed from the height adjustment table 3 and the turntable 2 as described above, as shown in FIG.
The turntable 2, height adjustment table 3, and steel structure 4 can be placed on top of it in order and fixed with bolts.The method of fixing the steel structure 4 and height adjustment table 3 is as follows It is sufficient to receive and fix it with the perfect circle holding structure inside the copper structure. Next, the blasting device 5 and the metal thermal spraying device 6 are arranged around the rotating device related to the above-mentioned sanding, and these are positioned so that they do not adversely affect each other, and while the steel structure 4 is being rotated, the blasting device 5 and the metal spraying device The metal spraying device 6 performs blasting, base spraying, and aluminum or zinc spraying.

At this time, the blast nozzle 5a is constructed such that it can be raised and lowered by a chain 5b, etc., and the front part of the blast device 5 is opened to form an injection window 5c, and the injection window 5c covers the movement range of the blast nozzle 5a, that is, the steel structure Form over the height of object 4. A rubber plate that can be slid back and forth is attached to the edge of the injection window 5c, and adjusted so that a gap remains between the blasting device 5 and the surface of the steel structure 4 in consideration of vibration during rotation. Further, during blasting, it is preferable to keep the vibration of the steel structure to a minimum, and by doing so, scattering of the abrasive material can be effectively prevented. In addition, it is preferable that approximately three blast nozzles 5a are normally provided in the blasting device 5, and each of them is fixed to the chain 5b at a different angle. 5d and a spring mechanism is attached to the primary window frame 5d so that the window frame 5d can be brought as close to the surface of the steel structure as possible, thereby almost completely preventing the abrasive from scattering. Also,
Since the steel structure 4 is being rotated, it is preferable that a Teflon roller 5e or the like is normally attached to the outside of the primary window frame 5d to intervene in the gap between the primary window frame 5d and the surface of the steel structure.
A secondary window frame 5f is attached to the outside of the primary window frame 5d, and even if some abrasive material scatters from the gap between the primary window frame 5d and the surface of the steel structure, the outer secondary window frame prevents it from scattering. It is preferable to do so. Incidentally, the injected abrasive material is reversed and accumulated in the device, dropped onto a belt conveyor 7 at the bottom, and collected and recycled into a pressurized multi-stage blast tank 8.

Next, in the thermal spraying device 6, a base thermal spraying gun 9 is usually installed at the lower part, and a metal thermal spraying gun 10 made of aluminum or zinc is arranged at the -F section, and these are fixed to the deen 6d and configured to be able to be raised and lowered. .

At this time, usually about two thermal spray guns 9 are arranged side by side in the horizontal direction, metal such as aluminum is supplied as a wire from the feed line reel 9a, and the metal is sprayed while being lowered by the chain 6d. Continuously perform metal spraying. In addition, in the metal spraying equipment configured as described above, the rotation speed of the turntable is adjusted to the rotation speed that obtains a specified film thickness, and in particular, since the diameter changes with a rough-shaped type, it is necessary to maintain a uniform film thickness. In order to do this, it is preferable to adjust the rotation of the steel structure 4 to keep the circumferential speed constant each time the thermal spray gun 9 moves down one pitch.

Follow ． Preferably, the turntable is rotated by a continuously variable transmission device incorporating a pilot motor for changing speed. Next, the manner of use of the metal thermal spraying apparatus having the above configuration will be explained as follows.

First, when thermal spraying a steel structure such as a load pipe, the cylindrical part of the steel structure 4 is supported and rotated by the turntable 2, and depending on the rotational speed at this time, the blasting process may be too much or too little. Perform blasting by adjusting the amount of abrasive spray and the number of nozzles so as not to cause

Next, when the blasting material reaches a distance that does not adversely affect the thermal spraying (approximately 500 TWL), the base thermal spray gun 9
ignite and start spraying.

After the base thermal spraying is completed, when each b of the aluminum or zinc thermal spray gun 10 reaches the lower part of the steel structure 4 on the surface coated with the base thermal spray, the thermal spraying is completed and the thermal spraying process of the steel structure is completed. When thermal spraying is performed in this way, the blasting is carried out prior to the thermal spraying, and in particular, the thermal spraying is completed 44 minutes after the blasting is completed, so the steel structure is activated. During this time, a thermal spraying process is carried out, and a thermal sprayed layer with excellent adhesion is obtained. Further, the working time is 44 minutes for the preceding blasting process and about 230 minutes for the thermal spraying, making the total working time 274 minutes, which can be completed in an extremely short time.

In addition, when working in this manner, a sprayed layer of 190 microns occupies 90% of the total surface area, and a sprayed layer with a thickness of 180 microns to 200 microns can be formed. As mentioned above, the blast nozzle and thermal spray nozzle locus A are formed as shown in FIG. 3, so that a predetermined thermal spray film can be obtained, and even if the steel structure has a large diameter, it can be easily subjected to bath spray treatment.

As explained in detail above, the present invention consists of a blasting device and a metal spraying device arranged around a rotating device that holds a truncated conical steel structure vertically and rotates it around its vertical axis. (1) Blast treatment, base thermal spraying, and metal thermal spraying of aluminum or zinc can be carried out in parallel and consistently, so the working time is shortened.

(2) Since each processing step is completed within a short time, the degree of bonding of the sprayed film is extremely good.

(3) Since the work is performed using automatic equipment, each processing work is uniform, and the amount of thermal spraying material, gas, and number of workers is reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view of a metal thermal spraying apparatus according to one embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the soil along line A-A, and FIG. FIG. 2 is an explanatory diagram of an example of a blast or metal spray trajectory in the case of metal spray processing.

Claims (1)

[Claims] 1 A blasting device and a metal blasting device are installed at intervals along the direction of rotation around a rotating holding device that vertically holds a funnel-shaped or trumpet-shaped truncated conical steel structure and continuously rotates it around its vertical axis. The blasting device is provided with a blast nozzle that moves up and down over the height of the structure and a belt conveyor that collects and discharges the sprayed abrasive material, while the metal thermal spraying device is provided with a An integrated processing device for shot blasting and metal spraying of trumpet tubes, funnel tubes, etc., characterized by having thermal spray guns that move up and down over a height to perform base thermal spraying and metal thermal spraying.