JPS6116592B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a new ice blasting method, and more specifically to sandblasting sand used in surface polishing operations such as rust removal of steel plates and painting base treatment. This invention relates to an ice grain blasting method that targets ice grains as a substitute for ice grains, incorporates a grinding process into a closed cycle using a continuous ice making process as the ice grain source, and allows the ice grains to be reused after polishing. .

[Conventional technology]

Sandblasting and shotblasting, which use sand and steel balls, are generally used to clean steel plates and equipment, but these methods have problems with the processing of the dust generated.
In the former case, there was the problem of disposing of the waste sand generated in large quantities. In recent years, in order to solve this problem, an ice blasting method has been proposed in which ice chips are used instead of solids such as sand (for example, Patent No. 687183).
This uses the liquefaction of the spray particles to reduce waste and prevent the generation of particulate dust, and its usefulness has been highly evaluated. However, since the traditional ice-making technology of obtaining ice pieces by crushing large pieces of ice had not been broken, various problems such as those described below appeared, and the value of its use was halved. That is, (a) it is impossible to obtain a uniformly polished surface because it cannot be crushed into uniform sizes; (b) ice making factories are often independent, and there is a loss in transporting the melted ice to the construction site and temporary work at the construction site. Difficulty in securing storage; C. Difficulty in crushing ice evenly, making it impossible to create a mechanism to continuously supply ice pieces; D. Large loss of ice, especially cold energy, during transportation, temporary storage, and crushing processes. (e) Since the ice is not reused once it is projected, there is a large loss of water and cold heat; (f) It has an uncertain crushing mechanism and cannot be continuously replenished with ice chips, so it cannot be used as a continuous blasting device.

[Purpose of the invention]

Therefore, in view of the problems with the conventional ice blasting method, the present inventors have devised the present invention to effectively solve the problems.

Therefore, the purpose of the present invention is to enable continuous blasting using ice particles, to save resources by recovering and reusing cold heat and water, and to avoid discharging sewage or scattering dust, and to clean the object to be polished. To provide an ice particle blasting method which applies anti-corrosion treatment to ice particles and prevents the adhesion of foreign matter.

[Summary of the invention]

In order to achieve the above object, the present invention extracts ice grains from a process of continuously producing ice grains by supplying water, mixes a rust preventive agent into the ice grains, and then covers steel plates etc. with compressed air or high pressure water. The used ice particles are removed after being projected onto the object to be polished and cleaned.
The melt water and rust preventive agent are collected, and after being purified, they are returned to the initial process.
It is configured to perform blasting using a continuous closed cycle of ice particles.

〔Example〕

Hereinafter, a preferred embodiment of the ice particle blasting method according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing an example of an ice particle blasting apparatus for explaining the method of the present invention.

In the figure, 1 is a continuous ice particle production device, whether it is a device that obtains ice particles directly from water or an indirect method that obtains ice particles by crushing the ice blocks after making them. Any means that can produce ice grains continuously as long as the supply continues is included in the present production apparatus. For example, an example of a device for directly obtaining ice grains from water is one that produces ice grains by injecting water into an ultra-low temperature cold liquid and exchanging heat. This is done by keeping cold energy, such as n-hexane, which is insoluble in water, has a freezing point well below the freezing point, and is liquid even at room temperature, at a temperature of -80 to -60°C, and stores it in a cold liquid tank. Water cooled to 0 to 4° C. is ejected here in droplets, and ice grains generated by this ejection are taken out.

Reference numeral 2 denotes ice particle projecting means connected to the outlet of the continuous ice particle device 1. This ice grain projecting means 2 is composed of an ice grain storage tank 3, an air compressor 4, and an injection nozzle 5, and the ice grains sequentially sent out from the continuous ice grain production device 1 and stored in the ice grain storage tank 3 are air compressed. The compressed air from the shank 4 is used to flow out the air and guide it to the injection nozzle 5, whereupon the air is injected at a high speed.

Ice particle projecting means 2 is provided on the inflow side of the injection nozzle 5.
A rust preventive agent supply means 6 is connected to join the rust preventive agent supply means 6. This rust preventive supply means 6 includes a phosphoric acid-based rust preventive,
For example, a rust preventive tank 7 containing a rust preventive solution made by dissolving trisodium phosphate (Na3PO3) crystal powder in water.
and a pump 8 from which the solution is delivered, and is configured to be ejected in an appropriate amount as needed together with the ice particles 9 injected from the injection nozzle 5.

Reference numeral 10 denotes a receiving tank connected to a pump 11 to collect the ice particles 9 projected from the injection nozzle 5 onto the object to be polished 12, the melted water, the rust preventive solution, and the abrasive particles peeled off from the object to be polished. All of the cleaning material is collected in a receiving tank 10 and sent to the next process by a pump 11.

Further, 13 is a water treatment device equipped with a filter, etc., and is connected to a pump 14. The water treatment device 13 filters the collected liquid sent from the receiving tank 10 through the pump 11, and removes residual ice particles and melted water. It is configured so that only water and anti-corrosion solution are sent by the pump 14 to the continuous ice grain production apparatus 1 for reuse in ice grain production.

The connection of each of the above components is the injection nozzle 5 and the receiving tank 10.
All of the passages are sealed except between the two, and this sealed passage has a heat insulating structure along with each component.

Next, the operation of the ice grain ice blasting method implemented in the above configuration will be explained.

In the continuous ice grain production apparatus 1, ice grains are continuously produced without ceasing to replace the supplied water. Therefore, the production of ice particles continues as long as the supply of water continues. The manufactured ice grains are sent to the ice grain projecting means 2, and are jetted at a high speed from the jet nozzle 5 onto the object to be polished 12. The projected ice grains 9 impact the surface of the object to be polished with their own weight, apply frictional force, perform polishing, and cause the object to be polished to peel off. If the object to be polished 12 is an object other than a steel plate or the like that has no risk of rusting, there is no need to send out the rust preventive solution from the rust preventive tank 7. In this case, the anticorrosive solution is pumped out by the pump 8, atomized by compressed air, and applied to the entire surface of the surface to be polished, but the amount consumed is small because it is in the form of a thin film. In the receiving tank 10, not only the ice particles 9 and their melted water after being projected, but also their cold energy is collected together with the object to be polished. Therefore,
Nothing is discharged, and everything injected from the injection nozzle 5 is recovered. Only the abrasive material is removed from the recovered material in the water treatment device 13, and the remaining ice grains and water are again fed into the continuous ice grain production device and used for production of ice grains. Furthermore, although the rust preventive solution that is also introduced will be contained in the newly produced ice grains, a portion of the rust preventive agent will remain on the surface of the object to be polished due to the projection of the ice grains 9. Therefore, the amount of supply from the rust preventive tank 7 can be reduced.

Therefore, since ice grains are produced continuously and the produced ice grains are sequentially projected from the ice grain projecting means 2, there is no loss of cooling energy compared to the case where ice grains are produced intermittently. All of the ice particles and their melted water are collected and used again to produce ice particles, forming a closed cycle, which saves energy and allows continuous blasting.

In addition, if clean water is used for producing ice particles, unlike sand, etc., which originally contains dirt, it is possible to completely eliminate the adhesion of foreign substances to the object to be polished. Since the generated abrasive material is also removed by the water treatment device 13, not only is no polluted wastewater produced, but since the abrasive material is ice particles, there is no dust scattering.

Furthermore, the only drawback of using ice, which is that it causes rust, can be overcome by incorporating a rust preventive agent.

FIG. 2 is a schematic explanatory diagram showing another preferred embodiment of an ice particle blasting apparatus for carrying out the method of the present invention. The difference from the embodiment shown in FIG. 1 is that a high-pressure pump 15 is used instead of the air compressor 4 of the ice particle projecting means 2, and with this adoption, the ice particle storage 3 is no longer necessary, but a new one is used instead. Water tank 16
is becoming necessary.

That is, the ice grain projecting means 17 connected to the outlet of the continuous ice grain production device 1 is composed of a water receiving tank 16, a high pressure pump 15, and an injection nozzle 5. 5 and merges with the ice particles directly sent to the injection nozzle 5 from the continuous ice particle production device 1, and the ice particles 9 are injected together with high-pressure water.

In addition, a branch line is connected to the pump 14 connected to the water treatment device 13, and a part of the treated ice grains and water is returned to the continuous ice grain production device 1, and the rest of the water is sent to the water receiving tank. Further, a pipe line from a pump 8 connected to the rust preventive agent tank 7 is extended to the water receiving tank 16 so that the rust preventive solution is supplied to the water receiving tank 16.

According to the above configuration, in addition to the projected ice particles, high-pressure water washes the surface of the object to be polished, so that not only sanding but also cleaning can be performed, and a finer grain finish can be achieved.

〔Effect of the invention〕

In summary, the present invention exhibits the following excellent effects.

(1) Continuous blasting is possible by introducing a continuous ice grain production process into the ice blasting method, and it is also a closed cycle in which the ice grains, melted water, and antirust solution are collected and reused after being blasted. It is also possible to recover cold heat and save resources.

(2) Since ice grains are used as the abrasive material, there is no dust scattering, and since the source of ice grains is water, there is no foreign matter adhering to the object to be polished by using purified water. Since the abrasive material is separated by the water treatment device and becomes the only waste to be discharged, and everything else is collected, the discharge of waste water can be eliminated.

(3) By mixing the ice grains with a rust preventive agent, the only drawback of using ice, which is that it rusts, can be overcome.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a preferred embodiment of an ice blasting device implementing the ice blasting method according to the present invention, and FIG. 2 is a system diagram showing another preferred embodiment. In the figure, 1 is a continuous ice particle production device, 2 is an ice particle projection means, 3 is an ice particle storage, 4 is an air compressor, 5 is an injection nozzle, 9 is an ice particle, 10 is a receiving tank, and 12 is an object to be polished. , 13 is a water treatment device, 15 is a high pressure pump, 1
6 is a water tank.

Claims (1)

[Claims] 1 The first step is to continuously produce ice grains by supplying water, the second step is to mix the produced ice grains with a rust preventive solution, and the ice grains and the rust preventive solution are used to prevent rust on steel plates, etc. a third step of projecting the ice particles onto the object to be polished, which generates a An ice particle blasting method comprising: a fifth step of purifying the solution; and a sixth step of returning the purified ice particles, melted water, and antirust solution to the first step.