JPS6052800A - Method and device for polishing and cleaning material to be polished and cleaned - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This relates to a cleaning method and apparatus for removing dirt, etc., and more specifically, a method and apparatus for cleaning an object to be polished by mixing dry ice particles and ice particles and blasting the mixture. METHODS AND APPARATUS.

Methods for cleaning the object to be polished include: - Sandblasting, in which sand is blasted onto the object under high pressure from a nozzle; - Dry ice is crushed into particles, and the dry ice particles are used as particles on the object to be polished. There is a dry ice blasting method in which the object is polished by hitting it with ice particles, and an ice blasting method in which the object is polished by hitting the object with ice particles.

However, when the sandblasting method is adopted for cleaning equipment related to nuclear power plants, the sand that is blasted onto the surface of the object to be polished is contaminated with radioactive materials, so what should be done with the sand? In addition, the generation of dust causes the scattering of contaminants, so dust prevention is necessary.

In the case of the dry ice blasting method, when crushed to create dry ice particles, the dry ice tends to turn into powder;
There are problems in that the yield of dry ice used for cleaning is poor and the cost is high, and the dry ice vaporizes and the force of the object to be polished becomes invisible, resulting in poor workability.

In addition, in the ice blasting method, cleaning is performed by hitting the object with ice particles, but ice particles are not as hard as dry ice particles, so the cleaning efficiency is lower than that of dry ice particles. There is a problem that there is a lack of

The purpose of the present invention is to eliminate the scattering of contaminants, eliminate the situation where dry ice vaporizes and cannot see the future, and provide sufficient grinding power. , mix dry ice particles and ice particles in a desired ratio and hit the surface of the object to be polished with high pressure.
The ice prevents dry ice from vaporizing, improving workability, and preventing pollutants from scattering and releasing them into the atmosphere.

Embodiments of the present invention will be described below with reference to the drawings.

The figure shows, as an example, a case where a crusher is used to produce ice grains and dry ice material. The ice 5 carried by the truck z3 is kept in the freezer 24 until it is produced into ice particles by the crusher 1. On the other hand, the dry ice 6 carried by the truck 25 is also kept in the freezer 26 until it is crushed into dry ice particles by the crusher 3.

The ice chunks taken out from the freezer 24 are conveyed to the crusher 1 by a conveyor, and the ice crushed by the crusher 1 is sieved by the sieve machine 2 into ice particles 5a and ice particles 5b. 5a is placed in packet 8. On the other hand, the lumps of dry ice 6 taken out from the lfi freezer 26 are conveyed to the crusher 3 by a conveyor, and the dry ice 6 crushed by the crusher 3 is transferred to the special sieve 4 to make dry ice particles. The dry ice powder 6a is sieved into dry ice powder 6a and dry ice powder 6b, and the dry ice powder 6a is directly put into a packet 9, and the dry ice powder 6b is made into dry ice powder 6a by a pelletizer 7 and then put into a packet 9 by a conveyor. be.

The feature of the present invention is that the ice grains 5a and the dry ice grains 6a produced as described above are mixed in an arbitrary ratio (0
% to 100%) and project the mixture onto the object to be polished.The composition includes the ice particles 5a placed in the packet 8 described in 1i11 and the dry ice particles 6a placed in the packet 9. The projector receiving tank 10 for receiving the projector is arranged in two stages.
An electromagnetic on-off valve 1 is installed on the top of the projector 11 having valves 2a and 12b.
3, the upper tank 12a and the lower tank 12b
Similarly, electromagnetic on-off valves 14 and 15 are installed between the tank 12b and the lower end of the lower tank 12b, and the compressed air flow path 17 connects the compressor 16 and the projection nozzle 18, and the two upper and lower tanks 12a of the projector 11, 12b, and an on-off valve V1.
■.

At the same time, the lower end of the lower tank 12b and the compressed air passage 17 are connected to the electromagnetic on-off valve 1.
5, so that a mixture of ice particles 5a and dry ice particles 6a is carried by compressed air and projected from a projection nozzle 18 onto an object to be polished 22 on a rotary workbench 21. ■. , ■ is an on-off valve provided in the compressed air flow path 17,
27 and 28 are transport conveyors, and 29 is a manipulator for operating the projection nozzle 18 near the object 22 to be polished.

With the above configuration, ice 5 and dry ice 6, which were each transported as chunks by trucks 23 and 25, are
In both crushers 1 and 3, ice grains 5a and dry ice grains 6a are produced. When ice grains 5a are made from a lump of ice and dry ice grains 6a are made from a lump of dry ice, the ice grains 5a are transported by a conveyor 27, and the dry ice grains 6a are transported from packets 8 and 9 by a conveyor 28 to a projector. The mixture is transferred to a receiving tank 10 and mixed in an arbitrary ratio. The mixed ice particles 5a and dry ice particles 6a are transferred into the projector 11. In this case, the projector 11 has two tanks 12a,
12b are connected vertically, the mixture of ice particles 5a and dry ice particles 6a is transferred onto the compressed air flow path 17 by the following operation.

First, from the projector tank 10 to the projector tank 11, the two-stage tank 1
2a, use the electromagnetic on-off valve 14 and the on-off valve V.

is closed, the electromagnetic on-off valve 13 is opened, and the mixture of ice 1Q5a and dry ice grains 6a in the projector receiver tank 10 is transferred to the upper tank 1.
Drop into 2a. Next, the electromagnetic on-off valve 13, the on-off valve V,
is closed, and the electromagnetic on-off valve 14 and on-off valves V, , and V are opened to transfer the mixture of ice particles 5a and dry ice particles 6a from the upper tank 12a to the lower tank 12b.

Next, the electromagnetic on-off valve 15 and the on-off valves V, , V4 are opened, and the mixture of ice particles 5a and dry ice particles 6a from the projector 11 is delivered to the projection nozzle 18 using compressed air.
Make sure to send it continuously. At the same time, the above operation is repeated so that the mixture of ice particles 5a and dry ice particles 6a in the projector receiving tank 10 is transferred to the upper tank 12a of the projector 10.

The mixture of ice particles and dry ice particles sent to the projection nozzle 18 is projected onto the object to be polished 22 from the projection nozzle 18 which is remotely controlled by a manipulator 29 .

When a mixture of ice grains and dry ice grains are hit from the projection nozzle 18 onto the object to be polished 22, the dry ice grains 6a break down during polishing, become powder, and become smoke-like, but at the same time, the ice grains 5a When it hits the object 22 to be polished and is polished, it breaks into a mist, resulting in wet blasting, which suppresses smoke-like vaporization caused by dry ice. This improves the visibility to the object to be polished 22, improving the working environment, and since it is a wet type, it is also possible to prevent the cleaned contaminants from scattering.

Although the case where the compressor 16 pressurizes is shown,
The pressurizing means may be other than a compressor, and the crusher 1,
Although the case where the crushed material in step 3 is sieved by each of the sieving machines 2 and 4 is shown as an example, it is noted that other methods may be adopted for making ice grains and dry ice grains, as shown by imaginary lines in the figure. As described above, a mixer 30 is installed in the middle of transferring the ice particles 5a and dry ice particles 6a to the projector receiving tank 10 by the conveyor 27, 28, and after the ice particles 5a and dry ice particles 6a are mixed in the mixer 30, the ice particles 5a and the dry ice particles 6a are projected. The projector 11 may be sent to the container receiver 4@10, and the projector 11 has two tanks 12a.

12b for continuous projection, but it goes without saying that only one tank may be used, and that the pond and ears of rice may be changed without departing from the gist of the present invention.

As described above, according to the present invention, ice grains and dry ice grains are made separately, mixed, placed in a tank, and then pressurized and projected onto the object to be polished in a mixed state. It is possible to suppress the vaporization phenomenon caused by ice powder by using ice powder, eliminating the possibility of not being able to see the future, and the water generated by the ice particles being crushed results in wet blasting.
It is possible to prevent the risk of the polished contaminants being scattered or being released into the atmosphere through a filter, and the cleaning with dry ice can be carried out effectively and sufficient polishing efficiency can be obtained, etc. It can produce excellent effects.

[Brief explanation of drawings]

The figure is a schematic diagram showing an example of the present invention. ■, 3 is a crusher, 2 and 4 are sieve machines, 5a is ice grains, 6
a is a dry ice grain, 10 is a projector receiving tank, 11 is a projector, 12a, 12b are tanks, 13, 14, 15 are electromagnetic on-off valves, 16 is a compressor, 18 is a projection nozzle, and 22 is an object to be polished. Patent applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Procedural amendments June 26, 1980 Director-General of the Patent Office Kazuo Wakasugi 2. Name of the invention 1. Method and device for cleaning 14 objects 3. Person making the amendments Patent applicant Higashig, Miyakochiyo N+-ku, Otemachi 2-2-1 (009) Ishikawajima Harima Heavy Industries Co., Ltd. (1 other person) 4, Representative Yahagi Daini 11-3-5-3 Uchigami, Hiyota-ku, Tokyo Correction of building drawings The drawings are corrected as shown in the attached sheet. 7 List of attached documents (1) 1 copy of drawings

Claims (1)

[Claims] 1) Ice grains and dry ice grains are made separately and mixed;
A method for cleaning an object to be polished, characterized in that the ice particles and dry ice particles are mixed in an arbitrary ratio and pressurized and projected onto the object to be polished. 2) Separately install a device that makes ice particles from ice chunks and a device that makes dry ice particles from dry ice chunks,
A device is provided for transferring the ice grains and dry ice grains produced by each of the devices to a projector, the projector is equipped with a pressurizing means, and the ice grains and dry ice grains are mixed in an arbitrary ratio. A device for polishing an object to be polished, characterized in that it is provided with a projection nozzle for projecting light onto the object to be polished.