Blast celaning method and method and device for producing solid carbon dioxide to be used for the same

Abstract

The present invention provides a blast cleaning method with cleaning performance adjustable by changing the hardness, shape and size of solid carbon dioxide to be used as a shot material, and a method and a device for producing solid carbon dioxide to be used for the blast cleaning method.The blast cleaning method includes the steps of: forming plate-shaped solid carbon dioxide, crushed pieces of which are used as a shot material (Step S10), transporting the formed plate-shaped solid carbon dioxide to a site of work (Step S20), crushing the plate-shaped carbon dioxide at the site of work, etc. (Step S30), putting the crushed pieces into a cleaning device (blasting machine) (Step S40), and cleaning an object to be cleaned by blowing the crushed pieces to the object to be cleaned (Step S50).

Description

TECHNICAL FIELD[0001]The present invention relates to a blast cleaning method using crushed pieces of solid carbon dioxide as a shot material, and specifically, to a blast cleaning method with cleaning performance adjustable by changing the hardness and size of the shot material, and a method and a device for producing solid carbon dioxide to be used for the blast cleaning method.BACKGROUND ART[0002]Blast cleaning is a method for removing rust and coating on an object to be cleaned made of a metal or ceramic, etc., by blowing a shot material thereto at a high speed, and generally, sand is frequently used as the shot material. However, when sand is used as the shot material, the shot material easily remains on the object to be cleaned, and an operation to recover the shot material may become necessary. Usually, such a shot material is hardly recovered. Further, the increase in the number of processes increases the cleaning cost. Therefore, in recent years, a blast cleaning method usi...

AI Technical Summary

Benefits of technology

[0024]As described above, according to the blast cleaning method of the first aspect of the invention, the cleaning performance can be adjusted by changing the hardness, shape, or size of the shot material. The amount of reduction caused by vaporization during transportation can be made smaller than in the case where the pellet-like dry ice is transported. Further, the hardness when solid carbon dioxide is formed can be maintained until just before it is crushed at the site of work.

[0025]When powdered dry ice is pelletized, a large-sized hydraulic compressor is required, however, according to the blast cleaning method of the second aspect of the present invention, crushed pieces with a desired size can be easily formed by a small-sized crushing machine. Therefore, the cost necessary for the cleaning operation can be greatly reduced.

[0026]According to the method for producing solid carbon dioxide of the third aspect of the present invention, solid carbon dioxide having a hardness suitable as a shot material in the blast cleaning method can be easily formed. Further, plate-shaped solid carbon dioxide from which crushed pieces having sharp angles suitable as a shot material in the blast cleaning method can be formed can be easily produced.

[0027]In the device for producing solid carbon dioxide according to the fourth aspect of the present invention, liquid carbon dioxide can be easily cooled to a desired temperature in a state where a pressure higher than the pressure of the triple point is applied thereto.

Problems solved by technology

However, when sand is used as the shot material, the shot material easily remains on the object to be cleaned, and an operation to recover the shot material may become necessary.

Usually, such a shot material is hardly recovered.

Further, the increase in the number of processes increases the cleaning cost.

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