Blasting Chamber

Abstract

A blasting chamber capable of conducting painting on a workpiece subsequent to a blasting process in the same working chamber is provided. A dust collection unit 20 that ventilates a main unit 10 during blasting work and a ventilation unit 30 that ventilates a main unit during a painting step are provided. A side wall 11 of the main unit is provided with an entrance 11a and an opening-and-closing member 11b that opens / closes the entrance, the dust collection unit is provided so as to project from a roof panel 15 to a floor panel 16 at a position closer to an other side wall 12 that is opposed to this side wall so as to partition the interior of the main unit, and a working space 10a and a ventilation duct 10b are defined in the main unit. A roof panel 15 above a working space has air suction holes 17 formed therein, and an intake opening 22 that communicates between the dust collection unit and the ventilation duct is provided. The side wall is provided with an opening 12a that communicates between the ventilation unit and the ventilation duct, and during the blasting process, ventilation is conducted with the dust collection unit with the entrance closed, and during painting, ventilation is conducted with the ventilation unit with the entrance opened.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to blasting chambers or working chambers for a blasting process (in this description, simply referred to as “blasting chambers”), and in particular, to a blasting chamber having formed therein a working space that is large enough so that, when the blasting process is to be conducted on a relatively large-sized workpiece to be processed, one or more workers can enter together with the workpiece and conduct work; and that is adapted to both blasting processing and painting by permitting not only the blasting process, but also painting of the workpiece after the blasting process in the same space.[0003]The term “blasting process” in the present invention is applied in the most broad sense; it includes processes of various types, such as those known as dry ejection or projection (hereinafter referred to as “ejection”, also including projection) in which an abrasive is ejected as a mixed fluid w...

AI Technical Summary

Benefits of technology

[0046]Furthermore, according to the configuration of the above-described working chamber 1, during the blast processing conducted with the entrance 11a closed, since the outside air is introduced into the working chamber 1 through the air suction hole 17 formed in the roof panel 15 of the main unit 10, and suction is applied in the working space 10a at a relatively low position between the lower end 25a of the partition wall 25 and the floor panel 16 through the ventilation duct 10b that communicates with the working space 10a, as shown in FIG. 1 as one example, a downward airflow that acts on an abrasive ejected in the working space 10a or dust, such as abrasive dust and a fragmented powder of the abrasive generated with the blasting process, so as to push them down to the floor panel 16 side is generated in the working chamber 1; as a result, contamination due to the suspension of the abrasive or the dust can be solved at an early stage. The abrasive or the dust is not easily adhered to the roof panel 15 or the side walls 11 to 14 etc., and thus, a harmful effect whereby abrasive or dust that has adhered to such locations falls on a painted coating and is adhered thereto during subsequent painting is also prevented.

[0064]In addition, by shutting the openings in the perforated plate 61 with the shutting means 63 during painting, it is possible to prevent the paint particles from entering the collecting space 62 and to prevent contamination of the abrasive with the paint: even when the abrasive or the dust remains in the collecting space 62, this abrasive or dust is suitably prevented from being blown upward and contaminating the paint coating.

Problems solved by technology

With such a blasting process, the working environment is contaminated by scattering of the ejected abrasive, or dust consisting of a crushed powder generated by collision of the abrasive with the workpiece, powder produced by cutting the workpiece, and so forth.

In addition, also during painting, the surroundings are contaminated by scattered paint particles sprayed by a spray and so forth, or evaporation etc. of the solvent contained in the paint, and at the same time, conversely to this situation, the quality of the painting is deteriorated greatly if foreign matter such as dust particles and so forth enter the working space from the surroundings and adhere to the paint coating.

However, if, for example, the workpieces are large and are small-production items, the material or the shape of the workpieces to be processed and the process details are often different at every process; and it is not uncommon for workers to conduct the processes manually for each individual workpiece that is not suitable for processing by a standardized flow process on an assembly line such as the conveyor described above.

Thus, if separate working chambers are to be provided for the blasting process and the painting, respectively, it is necessary to ensure an extremely large installation space and to prepare the equipment needed for each process, and thus, a large initial investment will be required.

However, if the work is shared between the different process suppliers for the respective steps in this manner, the workpiece has to be transported / transferred for every work step, resulting in an associated time loss or financial burden.

In addition, if a long period of time is taken for the transportation or the transfer between the blasting process and the painting, staining and so forth may be caused on the surface of the workpiece, and in addition, a contaminant such as grease or the like may also be adhered on the surface of the workpiece due to the contact between the workpiece and workers, transfer machines etc. during the transportation or the transfer.

However, the abrasive used for the blasting process or the dust caused during the blasting process etc. is present in the working chamber where the blasting process has been conducted, and so, if the painting is conducted on the workpiece without taking any measures in this working chamber, the abrasive or the dust may be adhered on the paint coating as foreign matter.

The adhesion of such foreign matter deteriorates the quality of the painting greatly, and in some cases, the painting itself may have to be repeated.

In addition, when the abrasive ejected within the working chamber is collected and recycled, if this abrasive is contaminated with paint, coloration of the abrasive or adhesion between the abrasive particles due to the paint may occur, and it may not be possible to collect and recycle the abrasive once it is used.

In addition, since the inside of the working chamber becomes contaminated with the scattered dust or fine particles of the atomized paint during both the blasting process and painting, it is required to ventilate the working chamber to keep it clean.

However, contamination within the working space during the blasting process is caused by dust consisting of fragmented abrasive or the powder produced by cutting the workpiece etc., and in addition, contamination within the working space during the painting is caused by the fine particles of the atomized paint ejected by spraying and so forth.

Because of the above points, the blasting process and the painting are not conducted within the same working chamber, and in addition, a working chamber configured to enable both the blasting process and painting to be conducted has not been proposed.

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