JP2002103230A - Method of polishing surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of polishing a surface capable of removing an accretion, such as a shell and rust, which adhere to the surface while reducing dust, noise and vibration substantially. SOLUTION: Abrasive material, that is, silica sand is fed to a tapered cone- shaped nozzle 1 in high pressure air set at an atmospheric pressure ranging from 5 to 10, and water is also fed to the nozzle 1. A ratio of the abrasive material K to the water is set at about 95 to 5 by weight, and the abrasive material K mixed with the air and the water is ejected toward the accretion to remove the accretion and to polish the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a surface of a ship, a fishing boat, a floating body on the sea, a shell attached to a seawall, other organisms attached to the surface, a rust or a waterproof, durable, fire-resistant lining layer or the like. The present invention relates to a technique for removing a lining layer and a surface layer for deposits by spraying an abrasive, and polishing the surface.

[0002]

2. Description of the Related Art Conventionally, a hard powdery abrasive is sent by high-pressure air and ejected from a nozzle tip, and the abrasive is caused to collide with the surface of an object to be polished at a high speed to destroy the attached matter on the surface by the impact force. The technology of removing and polishing the surface is widely known as sandblasting technology. However, the ejected abrasive material hits the surface of the object to be polished and scatters to the outer periphery, which spreads in all directions like smoke. This has made the working environment of the workers worse. Also, the noise was high.
As a method to solve this problem, a technique has been developed in which a nozzle is used as a mask to confine the abrasive and air flow within the mask.
In order to collect abrasives, peeled pieces, and crushed pieces, an air suction device, a collection device for abrasives, peeled pieces, and crushed pieces must be provided, and they must be attached to the mask via a hose. It was bad and the work cost was high. There is also a method of crushing / removing / peeling off the surface deposits with a conventional breaker, but the noise is extremely loud, and the working environment is bad because dust and noise and strong vibration are given to the operator. In addition, there were cases where the members under the deposit, the surface layer and the lining layer were damaged.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve these problems of the prior art, to greatly reduce dust, noise and vibration, to improve the working environment, and to improve the working environment. It is an object of the present invention to provide a surface polishing method that can be operated from a position, has good workability, and can hardly damage an object to be polished.

[0004]

Means for Solving the Problems The constitution of the present invention which has solved the above problems is as follows: 1) A powdery or granular abrasive is sent to a nozzle by high-pressure air, and a liquid such as water is sent to the nozzle at the same time. Mixing the liquid and the abrasive from the outlet and jetting it at high speed with an air flow to polish the surface of the surface to be polished without scattering the abrasive and the polished surface adhering pieces with the liquid. Characteristic surface polishing method 2) The surface polishing method according to 1), wherein the nozzle has a tapered shape.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The nozzle of the present invention has a shape of 15 cm.
It is possible to use a tapered cone shape, a small-diameter cylindrical shape, or a pipe shape with a length as small as possible, but it is preferable to taper the cone shape with an inclination of about 5 to 8/100. Further, it is preferable to form a wear-resistant liner layer inside the nozzle of the present invention. As the abrasive of the present invention, quartz sand, sand, fine iron balls and ceramic particles can be used. The pressure of the air sent into the nozzle may be about 5 atm. A predetermined amount of the abrasive is supplied to the high-pressure air pneumatic transport pipe with a feeder of a storage tank, and the nozzle is attached to the tip of the pneumatic transport pipe. And other liquids.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of the embodiment. FIG. 2 is an enlarged sectional view showing the nozzle of the embodiment. FIG. 3 is an explanatory view showing another example of the nozzle shape of the embodiment. In the figure, 1 is 8/1
A cone-shaped 17 cm long nozzle with a slope of 00,
1a is an injection port of the nozzle, 1b is an inlet for abrasive K and high-pressure air, 1c is an inlet for water, 1d is a water outlet in the nozzle 1, 2 is an air transport hose for transporting the abrasive K air, 3 is a pneumatic transport and powder supply device for the abrasive K, 3a is an abrasive tank
b is a feeder provided at the lower part of the abrasive tank 3a, 3c is a mixing section for sending the abrasive K to the pneumatic transport hose 2, 4 is 5
An air compressor that sends out high-pressure air of 10 to 10 atmospheres,
5 is a water pump, 6 is a water hose for supplying water to the water pump,
6a is a water amount adjusting valve provided near the nozzle 1 of the water hose,
7 is a hull of the ship, 8 is a shell attached to the hull, and K is an abrasive using silica sand.

In this embodiment, the high-pressure air of 5 to 10 atm of the air compressor 4 is sent to the pneumatic transportation and feeding device 3,
A predetermined amount of the silica abrasive K in the abrasive tank 3a is supplied to the mixing unit 3c by the feeder 3b, mixed with the high-pressure air that has been sent, transported, and sent to the nozzle 1 through the air transport hose 2. Can be In addition, water is sent to the nozzle 1 through the water hose 6 by the pump 5. The amount of water is adjusted by a water amount adjustment valve 6a near the nozzle 1. The weight ratio between the abrasive K of silica sand and water is about 95: 5. Nozzle 1
The abrasive K in the form of powder is introduced together with the high-pressure air, and water is also introduced into the nozzle 1. The water and the abrasive K are mixed so that the jet of the nozzle 1
A is sprayed out from a. In addition, since the nozzle 1 is tapered, the jet flow does not spread and is narrowed and hits the hull 7 of the target object, and the shells and the like attached to the surface are crushed and polished by the collision of the abrasive K and removed. . At this time, the water wets the crushed pieces, abrasive powder, abrasives, and dust, and prevents them from being scattered, and the powders, debris, and abrasives are washed away with water, and the next effective polishing is enabled. . As a result, dust can be greatly reduced to about 1/10 of the work by the conventional sand blast pick breaker, and the noise can be reduced by the breaker.
It was reduced to about 1/5 compared to using a pick and about 1/2 compared to conventional sandblasting. Furthermore, there was almost no damage on the hull surface. Although the present embodiment is an example of the removal and polishing of shells and rust of a hull, substantially the same effective effects can be obtained even in a refractory material peeling work of a layer in which a water pipe having a boiler furnace stud is attached with a refractory material. Was completed. Since the position of the worker is the nozzle ejection operation from a position 1 to several meters away from the surface of the hull and the lining layer, the adverse effects of dust, noise and vibration are small, and the working environment is greatly improved.

[0008]

As described above, according to the present invention, the generation of dust can be greatly reduced and the noise can be greatly reduced by jetting the abrasive with the air or the like mixed with a liquid such as water. There is an effect that the working environment is greatly improved by greatly reducing the width, and further, damage to the surface to be polished can be almost eliminated.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment.

FIG. 2 is an enlarged sectional view showing a nozzle according to an embodiment.

FIG. 3 is an explanatory view showing another example of the nozzle shape of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle 1a Injection port 1b Inlet port 1c Inlet port 1d Water ejection hole 2 Air transport hose 3 Air transport powder feeding device 3a Abrasive tank 3b Feeder 3c Mixing part 4 Air compressor 5 Water pump 6 Water hose 7 Hull 8 Shell K Polishing material

Claims (2)

[Claims] 1. A powdery abrasive is sent to a nozzle with high-pressure air, and a liquid such as water is sent to the nozzle. The liquid and the abrasive are mixed at a high speed by an air flow while mixing the liquid and the abrasive from the nozzle outlet. And polishing the surface of the polished surface without scattering the abrasive and the polished surface adhering pieces of the polished surface with a liquid. 2. The surface polishing method according to claim 1, wherein the nozzle has a tapered shape.